Coil unit, power transmission device, power reception device, power transmission system, and moving object

Abstract

A coil unit (5) includes a coil (10) including a coil element (10i) formed in a spiral shape around an arbitrary central axis (C), a magnetic resin layer (20), a first shield member (30), and a second shield member (40). The coil (10) has a first main surface (10a) and a second main surface (10b) which is a surface opposite to the first main surface (10a). The magnetic resin layer (20) is in direct contact with the second main surface (10b) of the coil (10). The coil (10), the magnetic resin layer (20), the first shield member (30), and the second shield member (40) are laminated in this order in a direction from the first main surface (10a) toward the second main surface (10b). The first shield member (30) is divided into a plurality of shield pieces (30P).

Description

Technical Field

[0001] The present disclosure relates to a coil unit, a power transmitting device, a power receiving device, a power transmission system, and a moving object. Background Art

[0002] Wireless power transmission systems that transmit power in a non-contact manner are becoming popular. JP2021-27112A discloses a coil unit used in a power transmission device and a power receiving device of a wireless power transmission system. The coil unit has a coil formed in a spiral shape. When power is supplied to the coil of the power transmission device, a magnetic field is generated in the coil. Due to the influence of the magnetic field, current flows in the coil of the power receiving device.

[0003] When large electric power is transmitted in a non-contact manner, a high-frequency large current flows through a resonant circuit including a coil. At this time, the heat generated by the coil increases. The heat generated by the coil increases due to, for example, the skin effect.

[0004] When using a twisted wire as a coil, the skin effect is suppressed. Therefore, the heating of the coil can be suppressed. However, since the twisted wire is formed by twisting a plurality of enameled wires, the manufacturing cost is high and the manufacturing process is laborious. In a high-power system, the coil may become larger, so the manufacturing cost and the manufacturing process may further increase.

[0005] On the other hand, there is also known a technology that uses a planar coil that is spiral-shaped and plate-shaped and has a rectangular conductor cross section, as disclosed in JP2021-27112A. According to such a planar coil, the thickness of the coil can be reduced.

[0006] However, in a wireless power transmission system for an electric vehicle, a power transmission device is arranged on a road surface such as a parking lot, and a power receiving device is arranged on the electric vehicle. Such a power transmission device and / or a power receiving device is provided with a coil unit in order to generate a magnetic field or to generate a current under the influence of a magnetic field. In the field of vehicles, due to the strict restrictions on the installation space of the coil unit, it is desired to reduce the size of the coil unit. Therefore, the use of the above-mentioned planar coil in the coil unit is being studied. However, the size of the coil unit cannot be sufficiently reduced by simply reducing the thickness of the coil.

[0007] The first invention has been made in view of this point, and its object is to reduce the size of the coil unit.

[0008] In addition, in wireless power transmission systems, it is desired to improve the performance of coil units and perform efficient power transmission.

[0009] The second invention has been made in consideration of this point, and its object is to realize efficient power transmission.

[0010] Disclosure of the Invention

[0011] <First Invention>

[0012] An object of the first invention is to reduce the size of the coil unit.

[0013] A coil unit according to a first aspect of the present invention includes a coil including a coil element formed in a spiral shape around an arbitrary central axis, a magnetic resin layer, a first shield member, and a second shield member.

[0014] The coil has a first main surface and a second main surface which is a surface opposite to the first main surface.

[0015] The magnetic resin layer is in direct contact with the second main surface of the coil.

[0016] The coil, the magnetic resin layer, the first shield member, and the second shield member are stacked in this order from the first main surface toward the second main surface.

[0017] The first shielding member is divided into a plurality of shielding pieces.

[0018] In the coil unit of the first invention,

[0019] The coil element may also include a conductor having a spiral shape,

[0020] The magnetic resin layer may be in direct contact with the conductor.

[0021] In the coil unit of the first invention,

[0022] The first shielding member may also include ferrite.

[0023] In the coil unit of the first invention,

[0024] The distance between the first shielding member and the second shielding member may be less than 2 mm.

[0025] In the coil unit of the first invention,

[0026] A heat conduction member may be disposed between the first shielding member and the second shielding member.

[0027] In the coil unit of the first invention,

[0028] The coil element may also include: a first straight line portion group, the first straight line portion group is composed of a plurality of first straight line portions arranged in a radial direction and extending in a first direction; a second straight line portion group, the second straight line portion group is composed of a plurality of second straight line portions arranged in a radial direction and extending in a second direction that is not parallel to the first direction, each second straight line portion is connected to an adjacent first straight line portion,

[0029] The first shield member may have a gap formed therein, the gap extending linearly between adjacent shield small pieces and crossing at least a portion of the first linear portion group when viewed in the axial direction.

[0030] In the coil unit of the first invention,

[0031] When viewed in the axial direction, an angle formed by the gap and at least a portion of the first straight portion group may be 80° to 100°.

[0032] In the coil unit of the first invention,

[0033] The gap may be orthogonal to at least a portion of the first straight line portion group when viewed in the axial direction.

[0034] In the coil unit of the first invention,

[0035] The gap may extend from a position radially inward of the first straight portion group to a position radially outward of the first straight portion group.

[0036] In the coil unit of the first invention,

[0037] The gap may also extend between the second straight section set and the center axis when viewed in the axial direction.

[0038] In the coil unit of the first invention,

[0039] When viewed in the axial direction, the gap or its extension line may also overlap with the central axis.

[0040] In the coil unit of the first invention,

[0041] Another gap may be formed in the first shielding component, the other gap extending linearly between adjacent shielding pieces and extending along the first straight portion within the first straight portion group when viewed in the axial direction.

[0042] The other gap may extend at a position closer to the central axis than the first straight line portion that is the smallest integer number counted from the innermost first straight line portion among the plurality of first straight line portions, wherein the smallest integer is a smallest integer greater than a value obtained by dividing the total number of the plurality of first straight line portions by 3.

[0043] In the coil unit of the first invention,

[0044] Another gap may be formed in the first shielding component, the other gap extending linearly between adjacent shielding pieces and extending along the second straight line portion within the second straight line portion group when viewed in the axial direction.

[0045] The other gap may extend at a position closer to the central axis than the second straight line portion that is the smallest integer number counted from the innermost second straight line portion among the plurality of second straight line portions, wherein the smallest integer is a smallest integer greater than a value obtained by dividing the total number of the plurality of second straight line portions by 3.

[0046] In the coil unit of the first invention,

[0047] Another gap may be formed in the first shielding component, the other gap extending linearly between adjacent shielding pieces and extending along the first straight portion within the first straight portion group when viewed in the axial direction.

[0048] The other gap may extend at a position on the opposite side of the central axis than the first straight line portion that is the smallest integer number counted from the outermost first straight line portion among the plurality of first straight line portions, wherein the smallest integer is a smallest integer greater than a value obtained by dividing the total number of the plurality of first straight line portions by 3.

[0049] In the coil unit of the first invention,

[0050] Another gap may be formed in the first shielding component, the other gap extending linearly between adjacent shielding pieces and extending along the second straight line portion within the second straight line portion group when viewed in the axial direction.

[0051] The other gap may extend at a position on the opposite side of the central axis side than the second straight line portion that is the smallest integer number counted from the outermost second straight line portion among the plurality of second straight line portions, wherein the smallest integer is the smallest integer greater than the value obtained by dividing the total number of the plurality of second straight line portions by 3.

[0052] In the coil unit of the first invention,

[0053] The coil element may also include:

[0054] a first straight line portion group, the first straight line portion group being composed of a plurality of first straight line portions arranged in a radial direction and extending in a first direction;

[0055] a second straight line portion group, the second straight line portion group being composed of a plurality of second straight line portions arranged in a radial direction and extending in a second direction that is not parallel to the first direction;

[0056] an intermediate curve portion group, the intermediate curve portion group being arranged between the first straight portion group and the second straight portion group and being composed of a plurality of intermediate curve portions;

[0057] Adjacent ends of the first straight portion and the second straight portion may be connected via the intermediate curved portion.

[0058] In the coil unit of the first invention,

[0059] A gap may be formed in the first shielding member, the gap extending linearly between adjacent shielding small pieces and crossing at least a portion of the intermediate curved portion group when viewed in the axial direction.

[0060] In the coil unit of the first invention,

[0061] When viewed in the axial direction, the angle formed by the gap and the tangent line of the at least part of the intermediate curved portion group may be 80° to 100°.

[0062] In the coil unit of the first invention,

[0063] When viewed along the axial direction, the gap and the tangent line may also be orthogonal.

[0064] In the coil unit of the first invention,

[0065] The coil element may also include:

[0066] a first straight line portion group, the first straight line portion group being composed of a plurality of first straight line portions arranged in a radial direction and extending in a first direction;

[0067] a second straight line portion group, the second straight line portion group being composed of a plurality of second straight line portions arranged in a radial direction and extending in a second direction that is not parallel to the first direction;

[0068] a first intermediate straight portion group, the first intermediate straight portion group being arranged between the first straight portion group and the second straight portion group and being composed of a plurality of first intermediate straight portions;

[0069] Adjacent ends of the first straight portion and the second straight portion may be connected via the first intermediate straight portion.

[0070] In the coil unit of the first invention,

[0071] When viewed along the axial direction, the angle between the first straight portion and the first intermediate straight portion may also be 125° to 145°.

[0072] When viewed along the axial direction, the angle formed by the second straight portion and the first intermediate straight portion may also be 125° to 145°.

[0073] In the coil unit of the first invention,

[0074] When viewed along the axial direction, the angle between the first straight portion and the first intermediate straight portion may also be 135°.

[0075] When viewed along the axial direction, the angle formed by the second straight portion and the first intermediate straight portion may also be 135°.

[0076] In the coil unit of the first invention,

[0077] The coil element may also be in an octagonal shape as a whole.

[0078] In the coil unit of the first invention,

[0079] The coil element may be in a regular octagonal shape as a whole.

[0080] In the coil unit of the first invention,

[0081] The first shield member may have a gap formed therein, the gap extending linearly between adjacent shield segments and crossing at least a portion of the first intermediate linear portion group when viewed in the axial direction.

[0082] In the coil unit of the first invention,

[0083] When viewed in the axial direction, an angle formed by the gap and the at least a portion of the first intermediate straight portion group may be 80° to 100°.

[0084] In the coil unit of the first invention,

[0085] The gap may be orthogonal to the at least a portion of the first intermediate straight portion group when viewed in the axial direction.

[0086] In the coil unit of the first invention,

[0087] The coil element may also include:

[0088] a first straight line portion group, the first straight line portion group being composed of a plurality of first straight line portions arranged in a radial direction and extending in a first direction;

[0089] a second straight line portion group, the second straight line portion group being composed of a plurality of second straight line portions arranged in a radial direction and extending in a second direction that is not parallel to the first direction;

[0090] a first intermediate straight portion group, the first intermediate straight portion group being arranged between the first straight portion group and the second straight portion group and being composed of a plurality of first intermediate straight portions;

[0091] a second intermediate straight portion group, the second intermediate straight portion group being arranged between the first intermediate straight portion group and the second intermediate straight portion group and being composed of a plurality of second intermediate straight portions;

[0092] The adjacent ends of the first straight portion and the second straight portion may also be connected via the first intermediate straight portion.

[0093] Adjacent ends of the first intermediate straight portion and the second intermediate straight portion may be connected via the second intermediate straight portion.

[0094] In the coil unit of the first invention,

[0095] When viewed along the axial direction, the angle between the first straight portion and the first intermediate straight portion may also be 140° to 160°.

[0096] When viewed along the axial direction, the angle between the first middle straight portion and the second middle straight portion may also be 140° to 160°.

[0097] When viewed along the axial direction, the angle formed by the second intermediate straight portion and the second straight portion may also be 140° to 160°.

[0098] In the coil unit of the first invention,

[0099] When viewed along the axial direction, the angle between the first straight portion and the first intermediate straight portion may also be 150°.

[0100] When viewed along the axial direction, the angle between the first middle straight portion and the second middle straight portion may also be 150°.

[0101] When viewed along the axial direction, the angle formed by the second intermediate straight portion and the second straight portion may also be 150°.

[0102] In the coil unit of the first invention,

[0103] The coil element may be in a dodecagonal shape as a whole.

[0104] In the coil unit of the first invention,

[0105] The coil element may be in a regular dodecagonal shape as a whole.

[0106] In the coil unit of the first invention,

[0107] The first shielding member may have a gap formed therein, the gap extending linearly between adjacent shielding small pieces and crossing at least a portion of the first intermediate linear portion group or at least a portion of the second intermediate linear portion group when viewed in the axial direction.

[0108] In the coil unit of the first invention,

[0109] When viewed in the axial direction, an angle formed by the gap and the at least a portion of the first intermediate straight portion group or the at least a portion of the second intermediate straight portion group may be 80° to 100°.

[0110] In the coil unit of the first invention,

[0111] The gap may be orthogonal to the at least a portion of the first intermediate straight line portion group or the at least a portion of the second intermediate straight line portion group when viewed in the axial direction.

[0112] In the coil unit of the first invention,

[0113] A gap may be formed in the first shielding member, the gap extending linearly between adjacent shielding pieces and crossing at least a portion of the coil element when viewed in the axial direction.

[0114] When viewed in the axial direction, the gap may intersect at least a portion of the plurality of turns forming the coil element.

[0115] When viewed along the axial direction, at the point where the gap intersects the turn, the angle formed by the gap and the turn or the tangent of the turn may also be 80° to 100°.

[0116] In the coil unit of the first invention,

[0117] When viewed in the axial direction, at the point where the gap intersects the turn, the gap may also be orthogonal to the turn or a tangent to the turn.

[0118] The coil unit of the first invention may further include a first connection terminal connected to the coil.

[0119] The coil may also have an inner end close to the central axis and an outer end away from the central axis.

[0120] The first connecting terminal may also be connected to the inner end portion and extend from the inner side of the coil to the outer side.

[0121] A gap may be formed in the first shielding member, the gap extending linearly between adjacent shielding pieces and extending from the inside to the outside of the coil.

[0122] When viewed in the axial direction, the first connecting terminal may also extend in the gap or in a cutout formed in the shielding sheet.

[0123] In the coil unit of the first invention,

[0124] The first connection terminal may extend from the inside to the outside of the coil at a height position overlapping with the small shielding piece when the coil unit is viewed from the side.

[0125] In the coil unit of the first invention,

[0126] The coil element may also have a plurality of turns arranged in a radial direction.

[0127] When viewed along the axial direction, at the point where the first connecting terminal intersects each turn portion, the angle formed by the first connecting terminal and the turn portion or the tangent line of the turn portion may also be 80° to 100°.

[0128] In the coil unit of the first invention,

[0129] When viewed along the axial direction, at the point where the first connecting terminal intersects each turn portion, the first connecting terminal may also be orthogonal to the turn portion or the tangent line of the turn portion.

[0130] In the coil unit of the first invention,

[0131] The coil element may further include a straight line portion group, wherein the straight line portion group is composed of a plurality of straight line portions arranged in a radial direction and extending in the same direction.

[0132] When viewed along the axial direction, the first connecting terminal may also intersect with the straight portion group.

[0133] In the coil unit of the first invention,

[0134] When viewed along the axial direction, the angle formed by the first connecting terminal and the straight portion group may also be 80° to 100°.

[0135] In the coil unit of the first invention,

[0136] When viewed along the axial direction, the first connection terminal may be orthogonal to the straight portion group.

[0137] In the coil unit of the first invention,

[0138] The coil element may further include a curved portion group, wherein the curved portion group is composed of a plurality of curved portions arranged in a radial direction and extending parallel to each other.

[0139] When viewed along the axial direction, the first connecting terminal may also intersect with the curved portion group.

[0140] In the coil unit of the first invention,

[0141] When viewed along the axial direction, the angle formed by the first connecting terminal and the tangent line of the curved portion group may also be 80° to 100°.

[0142] In the coil unit of the first invention,

[0143] When viewed along the axial direction, the first connection terminal may be orthogonal to the tangent line of the curved portion group.

[0144] In the coil unit of the first invention,

[0145] When viewed in the axial direction, a point where the first connection terminal overlaps with the outer peripheral edge of the first shielding member may be set as a first point.

[0146] When viewed in the axial direction, a point where the second connection terminal connected to the outer end portion overlaps with the outer peripheral edge of the first shielding member may be set as the second point.

[0147] When viewed in the axial direction, an angle formed by a first imaginary line connecting the first point and the central axis and a second imaginary line connecting the second point and the central axis may be less than or equal to 90°.

[0148] In the coil unit of the first invention,

[0149] The angle formed by the first imaginary line and the second imaginary line may be less than 45°.

[0150] In the coil unit of the first invention,

[0151] When viewed in the axial direction, a point where the first connection terminal overlaps with the outer peripheral edge of the first shielding member may be set as a first point.

[0152] When viewed in the axial direction, a point where the second connection terminal connected to the outer end portion overlaps with the outer peripheral edge of the first shielding member may be set as the second point.

[0153] The distance between the first point and the second point may also be less than 100 mm.

[0154] In the coil unit of the first invention,

[0155] The distance between the first point and the second point may also be less than 50 mm.

[0156] The coil unit of the first invention may further include a second connection terminal connected to the coil.

[0157] When viewed along the axial direction, the second shielding component may also be in a quadrilateral shape, and the first connecting terminal and the second connecting terminal may also extend from the same side of the second shielding component.

[0158] In the coil unit of the first invention,

[0159] The coil element may also be wound around the central axis along a first winding direction from its outer end toward its inner end,

[0160] The outer end may also be offset from the inner end toward the first circumferential direction.

[0161] In the coil unit of the first invention,

[0162] The coil element may also include: a first turn portion, the first turn portion including the inner end portion; a second turn portion, the second turn portion is radially adjacent to the first turn portion and is arranged at a radially outer position than the first turn portion; a third turn portion, the third turn portion is radially adjacent to the second turn portion and is arranged at a radially outer position than the second turn portion;

[0163] A distance between the inner end portion and the second turn portion may also be greater than a distance between the second turn portion and the third turn portion.

[0164] A power transmission device according to a first aspect of the present invention includes the coil unit according to the first aspect of the present invention.

[0165] A power receiving device according to a first aspect of the present invention includes the coil unit according to the first aspect of the present invention.

[0166] A power transmission system according to a first invention includes a power transmission device and a power receiving device.

[0167] At least one of the power transmitting device and the power receiving device includes the coil unit according to the first aspect of the present invention.

[0168] A moving object according to a first aspect of the present invention includes the coil unit according to the first aspect of the present invention.

[0169] According to the first invention, the size of the coil unit can be reduced.

[0170] <Second Invention>

[0171] The second invention aims to realize efficient power transmission.

[0172] A coil unit according to a second aspect of the present invention includes a coil including a coil element formed in a spiral shape around an arbitrary central axis.

[0173] When viewed along the axial direction, the coil element is in an octagonal shape as a whole.

[0174] In the coil unit of the second invention,

[0175] The coil element may also include seven straight line portions extending along seven of the eight sides of the octagon.

[0176] The angle formed by the adjacent straight line portion groups may be 125° to 145°.

[0177] In the coil unit of the second invention,

[0178] The angle formed by adjacent groups of straight line portions may be 135°.

[0179] In the coil unit of the second invention,

[0180] The coil element may be in a regular octagonal shape as a whole.

[0181] Alternatively, the coil unit of the second invention includes a coil including a coil element formed in a spiral shape around an arbitrary central axis,

[0182] When viewed along the axial direction, the coil element is in a dodecagonal shape as a whole.

[0183] In the coil unit of the second invention,

[0184] The coil element may also include 11 straight line portions extending along 11 of the 12 sides of the dodecagon.

[0185] The angle formed by the adjacent straight line portion groups may be 140° to 160°.

[0186] In the coil unit of the second invention,

[0187] The angle formed by the adjacent straight line portion groups may be 150°.

[0188] In the coil unit of the second invention,

[0189] The coil element may be in a regular dodecagonal shape as a whole.

[0190] The coil unit of the second invention may further include a first shielding member.

[0191] The first shielding component may also be divided into a plurality of shielding pieces.

[0192] The first shielding member may also be provided with gaps extending linearly between adjacent shielding pieces.

[0193] The coil element may include a straight line portion group consisting of a plurality of straight line portions arranged in a radial direction and extending in the same direction.

[0194] The gap may also extend across at least a portion of the set of rectilinear portions, viewed in the axial direction.

[0195] In the coil unit of the second invention,

[0196] When viewed in the axial direction, the angle formed by the gap and the at least a portion of the straight portion group may be 80° to 100°.

[0197] In the coil unit of the second invention,

[0198] The gap may be orthogonal to the at least a portion of the straight portion group when viewed in the axial direction.

[0199] A power transmission device according to a second aspect of the present invention includes the coil unit according to the second aspect of the present invention.

[0200] A power receiving device according to a second aspect of the present invention includes the coil unit according to the second aspect of the present invention.

[0201] A power transmission system according to a second aspect of the present invention includes a power transmission device and a power receiving device.

[0202] At least one of the power transmitting device and the power receiving device includes the coil unit according to the second invention.

[0203] A moving object according to a second aspect of the present invention includes the coil unit according to the second aspect of the present invention.

[0204] According to the second invention, efficient power transmission can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0205] Figure 1 FIG. 1 is a diagram schematically showing a wireless power transmission system to which a coil unit according to an embodiment can be applied.

[0206] Figure 2 is Figure 1 A perspective view of a coil unit used in the wireless power transmission system shown.

[0207] Figure 3 yes Figure 2 An exploded perspective view of the coil unit shown.

[0208] Figure 4 It is along Figure 2 A cross-sectional view of the coil unit of line IV-IV.

[0209] Figure 5A yes Figure 2 A top view of the coil unit is shown.

[0210] Figure 5B It is shown Figure 5A A diagram showing a first point, a second point, a first imaginary line, and a second imaginary line in the coil unit shown.

[0211] Fig. 6A is with Figure 5A The corresponding drawings are drawings showing modified examples of the coil unit.

[0212] Figure 6B It is shown Fig. 6A A diagram showing a first point, a second point, a first imaginary line, and a second imaginary line in the coil unit shown.

[0213] Figure 7 It is along Fig. 6A A cross-sectional view of the coil unit of line VII-VII.

[0214] Figure 8 is with Figure 5A The corresponding drawings are drawings showing another modified example of the coil unit.

[0215] Fig. 9is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0216] Fig.10 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0217] Fig.11 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0218] Fig.12 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0219] Fig.13 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0220] Fig.14 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0221] Fig.15 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0222] Fig.16 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0223] Fig.17 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0224] Fig.18 It is along Fig.17 A cross-sectional view of the coil unit of line XVIII-XVIII.

[0225] Fig.19 yes Fig.17 An exploded perspective view of the coil is shown.

[0226] Fig. 20 is with Fig.17 The corresponding drawings are drawings showing still another modified example of the coil unit.

[0227] Fig.21 is with Fig.17 The corresponding drawings are drawings showing still another modified example of the coil unit.

[0228] Fig. 22 is with Figure 5AThe corresponding drawings are drawings showing still another modified example of the coil unit.

[0229] Fig.23 is with Fig.17 The corresponding drawings are drawings showing still another modified example of the coil unit.

[0230] Fig.24 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0231] Fig.25 is with Fig.17 The corresponding drawings are drawings showing still another modified example of the coil unit.

[0232] Fig.26 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0233] Fig. 27 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0234] Fig.28 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0235] Fig.29 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0236] Fig.30 is with Fig.17 The corresponding drawings are drawings showing still another modified example of the coil unit.

[0237] Fig.31 is with Fig.17 The corresponding drawings are drawings showing still another modified example of the coil unit.

[0238] Fig.32 is with Fig.17 The corresponding drawings are drawings showing still another modified example of the coil unit.

[0239] Fig.33 is with Fig.17 The corresponding drawings are drawings showing still another modified example of the coil unit.

[0240] Fig.34 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0241] Fig.35 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0242] Fig.36 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0243] Fig.37 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0244] Fig.38 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0245] Fig.39 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0246] Fig.40 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0247] Fig.41 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0248] Fig.42 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0249] Fig.43 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0250] Fig.44 is with Fig.17 The corresponding drawings are drawings showing still another modified example of the coil unit.

[0251] Fig.45 is with Figure 5A The corresponding drawings are drawings showing still another modified example of the coil unit.

[0252] Fig.46 This is a table showing the Q values ​​and losses of the coil units of Examples 1-1 to 1-7.

[0253] Fig.47 This is a table showing the Q values ​​and losses of the coil units of Example 2 and Comparative Examples 2-1 to 2-4.

[0254] Fig.48 : is a table showing the evaluation results of the coil unit of Example 3.

[0255] Fig.49: is a table showing the evaluation results of the coil unit of Example 4.

[0256] Fig.50 This is a table showing the comparison results of the coil units of the third embodiment and the fourth embodiment.

[0257] Fig.51 : is a table showing the evaluation results of the coil unit of Example 5.

[0258] Fig.52 : is a table showing the evaluation results of the coil unit of Example 6.

[0259] Fig.53 : is a table showing the comparison results of the coil units of the fifth embodiment and the sixth embodiment.

[0260] Fig.54 : is a table showing the Q value of the coil unit of the seventh embodiment.

[0261] Fig.55 : is a table showing the comparison results of the Q values ​​of the coil units of Example 7.

[0262] Fig.56 is with Fig.17 The corresponding figures are used to illustrate Example 8.

[0263] Fig.57 It is a diagram for explaining the shape of the coil of the coil unit of Example 8-1.

[0264] Fig.58 It is a diagram for explaining the shape of the coil of the coil unit of Example 8-2.

[0265] Fig.59 It is a diagram for explaining the shape of the coil of the coil unit of Example 8-3.

[0266] Fig.60 It is a diagram for explaining the shape of the coil of the coil unit of Example 8-4.

[0267] Fig.61 It is a graph which shows the Q value of the coil unit of Example 8-1 to 8-4.

[0268] Fig.62 It is a graph showing the coupling coefficients of the coil units of Examples 8-1 to 8-4.

[0269] Fig.63 This is a graph showing the product of the coupling coefficient and the Q value of the coil units of Examples 8-1 to 8-4. DETAILED DESCRIPTION

[0270] Hereinafter, each embodiment will be described with reference to the accompanying drawings. It should be noted that in the drawings attached to this specification, for the sake of ease of illustration and understanding, the scale and aspect ratio are appropriately changed from the scale and aspect ratio of the actual object and are exaggeratedly shown.

[0271] In addition, in this specification, the terms such as "sheet", "film", and "plate" are not distinguished from each other only based on the difference in name. Therefore, for example, "sheet" is a concept that also includes a member that can be called a film or a plate.

[0272] In addition, in this specification, "a sheet surface (plate surface, film surface)" refers to a surface that coincides with the plane direction (surface direction) of the sheet-like (plate-like, film-like) component as a target when the sheet-like (plate-like, film-like) component is observed as a whole and globally. And, in this specification, the normal direction of the sheet-like (plate-like, film-like) component refers to the normal direction relative to the sheet surface (plate surface, film surface) of the sheet-like (plate-like, film-like) component as a target.

[0273] <Wireless Power Transmission System>

[0274] Figure 1 A wireless power transmission system S to which a coil unit according to an embodiment described later is applied is schematically shown. Figure 1 A wireless power transmission system S (hereinafter, simply referred to as a power transmission system S) will be described.

[0275] The power transmission system S includes a power transmission device 1 and a power receiving device 2. The power transmission device 1 includes a coil unit 5 and a high-frequency current supply unit 1A. The coil unit 5 in the power transmission device 1 functions as a power transmission coil unit. The high-frequency current supply unit 1A supplies a high-frequency current to the coil unit 5 as a power transmission coil unit.

[0276] The power receiving device 2 includes a coil unit 5 and a conversion unit 2A. The coil unit 5 in the power receiving device 2 functions as a power receiving coil unit. The conversion unit 2A shapes the high-frequency current generated by the coil unit 5. The conversion unit 2A has a rectifier circuit that converts the high-frequency current into a direct current.

[0277] When power is transmitted wirelessly (contactlessly) from the power transmission device 1 to the power receiving device 2, the power transmission device 1 supplies a high-frequency current of a predetermined frequency from the high-frequency current supply unit 1A to the coil unit 5 as the power transmission coil unit. At this time, a magnetic field is generated in the coil unit 5 by electromagnetic induction. And, due to the influence of this magnetic field, a high-frequency current is generated in the coil unit 5 as the power receiving coil unit in the power receiving device 2. The conversion unit 2A converts this high-frequency current into a direct current, and supplies the converted direct current to, for example, a battery not shown.

[0278] Figure 1The power transmission system S shown adopts a magnetic field resonance method as a power transmission method. However, the power transmission system S can also be configured as a power transmission system of an electromagnetic induction method. Here, the case where the power transmission system S is configured as a system for transmitting power to an electric vehicle in a wireless manner is described as an example. In this case, the power transmission device 1 is set on a road or a parking lot. The power receiving device 2 is set in the electric vehicle.

[0279] However, the use of the power transmission system S is not limited to power transmission to electric vehicles. For example, the power transmission system S can also be used to transmit power to flying objects such as drones and robots. In addition, the power transmission system S can also be used to transmit power to submarines and detection robots in the sea. In this way, the power transmission system S can be used to transmit power to various mobile objects such as electric vehicles, flying objects, robots, submarines, etc. It should be noted that the use of the coil unit of the embodiment is not limited to the wireless power transmission system. For example, the coil unit of the embodiment can also be used for transformers, DC-DC converters, antennas, etc.

[0280] The power transmission system S is provided with any one of the coil units 5 of the first and second embodiments and their modified examples described later as the coil unit 5. It should be noted that the same coil unit 5 may be used in the power transmission device 1 and the power receiving device 2, respectively. In addition, different coil units 5 may be used in the power transmission device 1 and the power receiving device 2, respectively. In addition, the coil unit 5 of the first and second embodiments and their modified examples may be used in one of the power transmission device 1 and the power receiving device 2, and a coil unit of another form may be used in the other. The coil unit 5 of the first and second embodiments and their modified examples will be described below.

[0281] <<First Embodiment>>

[0282] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

[0283] <Coil Unit>

[0284] Figure 2 It is a perspective view of the coil unit 5 according to the first embodiment. Figure 3 It is an exploded perspective view of the coil unit 5 . Figure 4 It is along Figure 2 4 is a cross-sectional view of the coil unit 5 along line IV-IV. Figure 5A as well as Figure 5B is a top view of the coil unit 5. Figure 3 as well as Figure 5A In the figure, illustration of a first connection terminal 46 and a second connection terminal 47 to be described later is omitted.

[0285] like Figures 2 to 4As shown, the coil unit 5 includes a coil 10, a magnetic resin layer 20, a first shielding member 30, and a second shielding member 40. In the example shown in the figure, the coil unit 5 further includes a first connection terminal 46 and a second connection terminal 47. Figure 2 As shown, the first connection terminal 46 and the second connection terminal 47 are connected to one end 10e1 and the other end 10e2 of the coil 10, respectively.

[0286] like Figure 4 As shown, the coil 10 has a first main surface 10a and a second main surface 10b. The second main surface 10b is a surface on the side opposite to the first main surface 10a. The coil 10 and the magnetic resin layer 20, the first shielding component 30 and the second shielding component 40 are arranged in sequence in the direction from the first main surface 10a to the second main surface 10b. Hereinafter, the terms "first side" and "second side" used for the coil unit 5 and its constituent elements refer to the side facing the first main surface 10a and the side facing the second main surface 10b, respectively.

[0287] (Coil)

[0288] like Figure 5A As shown, the coil 10 includes a coil element 10i formed in a spiral shape around an arbitrary central axis C. The spiral shape refers to the shape of a plane curve that moves away from the center as it turns (or approaches the center as it turns). The plane curve mentioned here also includes a plane pattern that is connected by bending into a broken line. In the illustrated embodiment, the spiral shape is located on an imaginary plane that is orthogonal to the central axis. The coil element 10i is formed of a conductive material. In the present embodiment, the coil element 10i is formed of copper, but is not limited to this. The coil element 10i can also be formed of other conductive materials such as copper alloys, aluminum, and aluminum alloys.

[0289] exist Figures 2 to 5B In the example shown, the coil 10 is composed of a single coil element 10i. The coil element 10i is in a plate shape. That is, the coil element 10i is a planar coil. Specifically, the coil element 10i is a planar coil element of a non-twisted wire. Figure 4 As shown, the cross-sectional shape of the wire in the direction orthogonal to the winding direction of the spiral shape of the coil element 10i is rectangular.

[0290] Figures 2 to 5B The reference symbol C shown shows the central axis of the coil element 10i (or coil 10) passing through the center of the spiral shape of the coil element 10i. Hereinafter, the axial direction refers to a direction extending on the central axis C or a direction parallel to the central axis C. In addition, the radial direction refers to a radial direction of a circle centered on the central axis C. In addition, the circumferential direction refers to a direction along a circle centered on the central axis C (the circumferential direction of the circle).

[0291] The coil element 10i includes a conductor 10E having a spiral shape. The conductor 10E includes a plurality of turns 101 to 108 arranged in the radial direction. In the illustrated example, the conductor 10E includes the first to eighth turns 101 to 108. The first to eighth turns 101 to 108 are arranged in sequence from the inner side to the outer side in the radial direction. In other words, the first turn 101 is located at the innermost side in the radial direction, and the eighth turn 108 is located at the outermost side in the radial direction. In other words, the first turn 101 forms the innermost circumference of the coil element 10i. In addition, the eighth turn 108 forms the outermost circumference of the coil element 10i. It should be noted that the radial inner side of a component refers to a position closer to the central axis C than the component. In addition, the radial outer side of a component refers to a position farther away from the component to the radial outer side. For example, when referring to the "radial inner side of the coil element 10i", this means a position closer to the central axis C than the innermost turn 101. When referring to “the radially outer side of the coil element 10 i ”, this means a position farther radially outward than the outermost peripheral turn portion 108 .

[0292] Each turn portion 101 to 108 extends on the above-mentioned imaginary plane. The first to eighth turns 101 to 108 are connected in sequence, thereby forming a spiral shape of the coil element 10i. In the example shown in the figure, the coil element 10i (conductor 10E) is wound in a manner that each turn portion 101 to 108 is roughly a quadrilateral, but it is not limited to this. Each turn portion 101 to 108 can also be wound in a manner that is roughly a polygon other than a quadrilateral.

[0293] One end of each turn portion 101 to 108 is located radially inward of the other end of the turn portion 101 to 108. In other words, the other end of each turn portion 101 to 108 is located radially outward of one end of the turn portion 101 to 108.

[0294] Each turn 101-108 includes a plurality of straight portions 11-14 arranged around the central axis C. The straight portions 11-14 adjacent in the circumferential direction of the circle centered on the central axis C are connected to each other. In the illustrated example, the straight portions adjacent in the circumferential direction are connected via the first intermediate curved portions 151-154 bent along the circumferential direction. In the illustrated example, the first to eighth turns 101-108 include a first straight portion 11 and a third straight portion 13 extending in the first direction D1, and a second straight portion 12 and a fourth straight portion 14 extending in the second direction D2. The first direction D1 and the second direction D2 are not parallel to each other. In the illustrated example, the first direction D1 and the second direction D2 are orthogonal. In each turn 101-108, the first straight portion 11 and the third straight portion 13 are arranged so that the central axis C passes between them. In addition, in each turn 101-108, the second straight portion 12 and the fourth straight portion 14 are arranged so that the central axis C passes between them. In each of the turns 101 to 108, the adjacent ends of the first straight portion 11 and the second straight portion 12 are connected via the first A intermediate curve portion 151. Similarly, in each of the turns 101 to 108, the adjacent ends of the second straight portion 12 and the third straight portion 13 are connected via the first B intermediate curve portion 152. In addition, in each of the turns 101 to 108, the adjacent ends of the third straight portion 13 and the fourth straight portion 14 are connected via the first C intermediate curve portion 153.

[0295] Furthermore, the fourth straight portion 14 of the radially adjacent turns 101, 102; ...; 107, 108 and the adjacent ends of the first straight portion 11 are connected via the first D intermediate curve portion 154. For example, the fourth straight portion 14 of the first turn 101 and the adjacent ends of the first straight portion 11 of the second turn 102 are connected via the first D intermediate curve portion 154. In addition, the fourth straight portion 14 of the second turn 102 and the adjacent ends of the first straight portion 11 of the third turn 103 are connected via the first D intermediate curve portion 154. Figure 2 As shown, the first connection terminal 46 is connected to the first straight portion 11 of the innermost first turn portion 101. The second connection terminal 47 is connected to the fourth straight portion 14 of the outermost eighth turn portion 108.

[0296] The first straight portions 11 of the plurality of turns 101 to 108 are arranged in the radial direction to form a first straight portion group 11G. In addition, the second straight portions 12 of the plurality of turns 101 to 108 are arranged in the radial direction to form a second straight portion group 12G. In addition, the third straight portions 13 of the plurality of turns 101 to 108 are arranged in the radial direction to form a third straight portion group 13G. In addition, the fourth straight portions 14 of the plurality of turns 101 to 108 are arranged in the radial direction to form a fourth straight portion group 14G. The straight portions 11, 11; 12, 12; 13, 13; 14, 14 adjacent in the radial direction are separated from each other in the radial direction. The first to fourth straight portion groups 11G to 14G are parallel straight portion groups composed of the plurality of first to fourth straight portions 11 to 14, respectively.

[0297] The first A intermediate curve portions 151 of the plurality of turns 101 to 108 are arranged in the radial direction to form a first A intermediate curve portion group 151G. The first B intermediate curve portions 152 of the plurality of turns 101 to 108 are arranged in the radial direction to form a first B intermediate curve portion group 152G. The first C intermediate curve portions 153 of the plurality of turns 101 to 108 are arranged in the radial direction to form a first C intermediate curve portion group 153G. The first D intermediate curve portions 154 of the plurality of turns 101 to 108 are arranged in the radial direction to form a first D intermediate curve portion group 154G. The first intermediate curve portions 151, 151; 152, 152; 153, 153; 154, 154 adjacent in the radial direction are separated from each other in the radial direction. The first A to first D intermediate curve portion groups 151G to 154G are parallel curve groups composed of the plurality of first A to first D intermediate curve portions 151 to 154, respectively.

[0298] exist Figures 2 to 5B In the example shown, the pitches of the plurality of turns 101 to 108 are equal. Therefore, the distance between the first turn 101 and the second turn 102 is equal to the distance between the second turn 102 and the third turn 103. In addition, in each of the straight portion groups 11G to 14G, the pitches of the plurality of straight portions 11 to 14 are equal. Therefore, the distance between the first straight portion 11 of the first turn 101 and the first straight portion 11 of the second turn 102 is equal to the distance between the first straight portion 11 of the second turn 102 and the first straight portion 11 of the third turn 103 is equal. In addition, in each of the first intermediate curve portion groups 151G to 154G, the pitches of the plurality of first intermediate curve portions 151 to 154 are equal. Therefore, the distance between the first intermediate curve portion 151 of the first turn 101 and the first intermediate curve portion 151 of the second turn 102 is equal to the distance between the first intermediate curve portion 151 of the second turn 102 and the first intermediate curve portion 151 of the third turn 103.

[0299] As an example, the coil element 10i described above is formed by punching a metal plate such as a copper plate into a spiral shape. On the other hand, the coil element 10i can also be formed by etching a metal foil such as a copper foil into a spiral shape. In this case, the coil element 10i can be formed in a complex spiral shape pattern. However, in etching, it takes time to ensure that the thickness of the coil element 10i that can implement the transmission of large power is sufficient. Therefore, from the perspective of manufacturing efficiency, stamping is preferred.

[0300] In addition, the thickness of the conductor 10E in the coil element 10i can also be, for example, greater than 0.2 mm and less than 1.0 mm. In addition, the radius of the coil element 10i (the distance from the central axis C to the radially farthest part) can also be greater than 200 mm. In the case where the coil 10 is used as a power transmission coil unit or a power receiving coil unit of a power transmission system S that transmits power to an electric vehicle by magnetic field resonance, the radius of the coil element 10i (the distance from the central axis C to the radially farthest part) is generally greater than 200 mm and less than 350 mm. In the present embodiment, the coil element 10i is rectangular as a whole. In this case, the maximum dimension of the long side direction of the coil element 10i can also be greater than 300 mm and less than 700 mm, and the maximum dimension of the short side direction orthogonal to the long side direction can also be greater than 200 mm and less than 650 mm. For example, when the coil 10 is used in a power transmission coil unit, the dimension of the long side direction of the coil element 10i may be greater than 550 mm and less than 700 mm, and the dimension of the short side direction of the coil element 10i may be greater than 400 mm and less than 550 mm. In addition, when the coil 10 is used in a power reception coil unit, the dimension of the long side direction of the coil element 10i may be greater than 350 mm and less than 500 mm, and the dimension of the short side direction of the coil element 10i may be greater than 200 mm and less than 350 mm.

[0301] In addition, when transmitting power to an electric vehicle by magnetic field resonance, it is preferred to be able to transmit more than 1 kW, preferably more than 5 kW of power in the frequency domain of high-frequency current of 10 kHz to 200 kHz, especially 79 kHz to 90 kHz. In this case, the thickness of the coil element 10i formed of copper is preferably more than 0.4 mm. It should be noted that if the thickness of the coil element 10i is too large, the weight of the coil 10 increases, for example, it is not suitable for vehicle mounting. Therefore, the thickness of the coil element 10i can be, for example, less than 2.0 mm, less than 1.5 mm, or less than 1.0 mm.

[0302] The line width of the conductor 10E in the coil element 10i is not particularly limited. However, considering that, for example, 1 kW or more, preferably 5 kW or more, of power can be transmitted in the frequency domain of high-frequency current of 79 kHz to 90 kHz, the line width of each turn portion 101 to 108 can be 2 mm or more and 20 mm or less, or 2 mm or more and 16 mm or less, 2 mm or more and 12 mm or less, or 2 mm or more and 8 mm or less. It should be noted that the line width refers to the distance between the inner peripheral surface and the outer peripheral surface of the conductor 10E on a cross section orthogonal to the direction in which the conductor 10E is wound.

[0303] It should be noted that the central axis C of the above-mentioned spiral shape is determined as follows in this specification. First, a linear imaginary turn portion similar to the innermost turn portion 101 is sequentially drawn in a spiral shape from the radially inner end of the innermost turn portion 101 to the radially inner side. Then, the drawing is continued until the imaginary turn portion contained within a diameter of 1 cm can be drawn. Then, the line passing through the radially inner side of the imaginary turn portion contained within a diameter of 1 cm in a direction orthogonal to the circumferential direction and radial direction of the spiral shape is determined as the central axis C.

[0304] The coil 10 has an end 10e1 connected to the first connection terminal 46 and 10e2 connected to the second connection terminal 47. In the illustrated example, the coil 10 is composed of a single coil element 10i. Therefore, one end 10e1 is an inner end located radially inward of the coil 10. In addition, the other end 10e2 is an outer end located radially outward of the coil 10. The inner end 10e1 is an end of the first turn 101 of the coil element 10i. The outer end 10e2 is an end of the eighth turn 108 of the coil element 10i.

[0305] (Magnetic resin layer)

[0306] The magnetic resin layer 20 is provided to suppress magnetic penetration and / or leakage magnetic field. The magnetic resin layer 20 overlaps with the coil 10 in the axial direction of the coil 10. In this state, the magnetic resin layer 20 is in direct contact with the second main surface 10b of the coil 10. In other words, the magnetic resin layer 20 is in direct contact with the conductor 10E. In the example shown in the figure, the magnetic resin layer 20 is in close contact with the second main surface 10b of the coil 10. In other words, the magnetic resin layer 20 is in close contact with the conductor 10E. The magnetic resin layer 20 covers the second main surface 10b. In more detail, the magnetic resin layer 20 is formed so that its outer peripheral edge is located outside the coil 10 when viewed in the axial direction.

[0307] The magnetic resin layer 20 has magnetism. The magnetic field generated by the coil unit 5 is generated in a manner that extends in all directions relative to the central axis C of the coil 10. At this time, the magnetic resin layer 20 has magnetism, so that the magnetic flux lines to be extended can be oriented on the side of the central axis C. In addition, when the magnetic field generated by the coil unit 5 reaches the peripheral components located around the coil unit 5, it sometimes has an adverse effect on the peripheral components. Therefore, the magnetic resin layer 20 is provided to suppress the magnetic field lines from reaching the peripheral components. Thus, the magnetic resin layer 20 can suppress the leakage magnetic field that does not contribute to the generation of electric current.

[0308] The magnetic resin layer 20 contains a magnetic substance. The magnetic resin layer 20 preferably contains a soft magnetic substance. More specifically, the magnetic resin layer 20 contains ferrite, preferably a soft ferrite. In addition, the magnetic resin layer 20 may contain a nanocrystalline magnetic substance.

[0309] In addition, the magnetic resin layer 20 contains resin. As the resin used to form the magnetic resin layer 20, for example, a thermosetting resin such as epoxy resin or polyimide can be used. In this case, as described later, when the coil 10 and the magnetic resin layer 20 are integrated by hot pressing, it is easy to deform the resin of the magnetic resin layer 20 along the shape of the coil 10 during the thermal curing process. In addition, as the resin used to form the magnetic resin layer 20, a thermoplastic resin such as nylon can also be used. In this case, it is also easy to deform the resin of the magnetic resin layer 20 along the shape of the coil 10.

[0310] like Figure 2 as well as Figure 4 As shown, the magnetic resin layer 20 has a spiral-shaped recessed portion 25 corresponding to the spiral shape of the coil 10. The recessed portion 25 is a portion of the magnetic resin layer 20 that is recessed in the axial direction of the coil 10, in other words, in the thickness direction of the magnetic resin layer 20. The recessed portion 25 is a spiral shape when viewed in the axial direction of the coil 10. Moreover, at least a portion of the coil 10 is housed in the recessed portion 25 in a state where its spiral shape matches the spiral shape of the recessed portion 25. In detail, the recessed portion 25 houses the entire conductor 10E. Therefore, as Figure 4 As shown, the magnetic resin layer 20 is in direct contact with three surfaces of the coil 10 other than the first main surface 10 a .

[0311] In the present embodiment, the conductor 10E does not protrude from the magnetic resin layer 20. In other words, the first main surface 10a of the coil 10 is coplanar with the surface facing the first side of the magnetic resin layer 20. However, only a part of the coil 10 may be accommodated in the recess 25 so that a part of the coil 10 protrudes from the magnetic resin layer 20. In addition, the coil 10 may be provided on the flat surface of the magnetic resin layer 20 without forming the recess 25 in the magnetic resin layer 20. In addition, the conductor 10E may be buried in the magnetic resin layer 20 without being exposed to the outside.

[0312] As described above, in the example shown in the figure, the magnetic resin layer 20 is in close contact with the second main surface 10b of the coil 10. Specifically, the magnetic resin layer 20 is welded to the coil 10 at the recess 25. That is, the coil 10 and the magnetic resin layer 20 are joined at the recess 25 by the anchoring effect. The coil 10 and the magnetic resin layer 20 are integrated, for example, by hot pressing. At this time, a portion of the magnetic resin layer 20 enters the recess on the surface of the coil 10 and then solidifies. As a result, the coil 10 and the magnetic resin layer 20 are welded, and the magnetic resin layer 20 is in close contact with the coil 10.

[0313] In the example shown in the figure, the magnetic resin layer 20 is divided into a plurality of parts similar to the first shielding member 30 described later. The magnetic resin layer 20 includes a plurality of magnetic resin elements 21 to 24. In the example shown in the figure, the magnetic resin layer 20 includes first to fourth magnetic resin elements 21 to 24. In the magnetic resin layer 20, gaps extending linearly between adjacent magnetic resin elements 21, 22; 22, 23; 23, 24; 24, 21 are formed. In the example shown in the figure, the gaps extending between the magnetic resin elements 21 to 24 coincide with the gaps 51 to 54 extending between the shielding small pieces 31 to 34 described later when viewed in the axial direction. It should be noted that the magnetic resin layer 20 may not be divided into a plurality of magnetic resin elements 21 to 24. In other words, the gaps may not be formed in the magnetic resin layer 20.

[0314] (First Shielding Member)

[0315] The first shielding member 30 is provided to suppress magnetic penetration and / or leakage magnetic field. The first shielding member 30 is formed in a plate shape and extends along a plane perpendicular to the axial direction of the coil 10. When the first shielding member 30 is viewed in the axial direction, its outer peripheral edge is located outside the magnetic resin layer 20 and the coil 10. The first shielding member 30 is provided between the second shielding member 40 and the coil 10 and the magnetic resin layer 20.

[0316] The first shielding member 30 includes a magnetic body. As described above, the magnetic field generated by the coil unit 5 is generated in a manner that expands in all directions relative to the central axis C of the coil 10. At this time, the first shielding member 30 has magnetism, so that the magnetic flux lines to be expanded can be oriented on the side of the central axis C. In addition, the first shielding member 30 is provided to suppress the magnetic flux lines from reaching the surrounding components. Thus, the first shielding member 30 can suppress the leakage magnetic field that does not contribute to the generation of current.

[0317] The first shielding member 30 preferably includes a soft magnetic material. More specifically, the first shielding member 30 includes ferrite, preferably soft ferrite. Alternatively, the first shielding member 30 may include a nanocrystalline magnetic material.

[0318] exist Figure 4 In the example shown, the first shielding member 30 is arranged separately from the magnetic resin layer 20, but the present invention is not limited thereto. The first shielding member 30 may also be in contact with the magnetic resin layer 20. In the case where the first shielding member 30 is arranged separately from the magnetic resin layer 20, a spacer (not shown) may be arranged between the first shielding member 30 and the magnetic resin layer 20. Thus, the distance between the first shielding member 30 and the magnetic resin layer 20 can be maintained at a predetermined distance. The distance between the first shielding member 30 and the magnetic resin layer 20 is not particularly limited, and is, for example, 3 mm or less. It should be noted that the longer the distance between the first shielding member 30 and the magnetic resin layer 20, the more difficult it is to dissipate heat from the coil unit 5, and the coil unit 5 may become high temperature. Therefore, the distance between the first shielding member 30 and the magnetic resin layer 20 is preferably 1 mm or less. The distance between the first shielding member 30 and the magnetic resin layer 20 may also be 0 mm. In other words, the first shielding member 30 and the magnetic resin layer 20 may also be in direct contact or in close contact. In order to reduce the size of the coil unit 5 (particularly, the size in the axial direction), it is also preferable to reduce the distance between the first shield member 30 and the magnetic resin layer 20 .

[0319] The first shielding member 30 is dimensioned so that its outer periphery is located outside the coil 10 when viewed in the axial direction. Here, as described above, in the case of the coil 10 of the power transmission coil unit or the power receiving coil unit of the power transmission system S for transmitting power to the electric vehicle, the size of the coil 10 (the size in the long side direction × the size in the short side direction) when viewed in the axial direction is usually 200 mm or more × 200 mm or more. Therefore, in this case, the outer size of the first shielding member 30 is also 200 mm or more × 200 mm or more. However, it is sometimes difficult to realize the first shielding member 30 of such a size with a single plate. For example, in the case where the first shielding member 30 is a ferrite plate, it is generally difficult to form a ferrite plate whose size in the long side direction and the size in the short side direction both exceed 150 mm. In addition, even if a ferrite plate whose size in the long side direction and the size in the short side direction both exceed 150 mm can be formed, such a ferrite plate is easy to break. If the first shielding member 30 in the coil unit 5 breaks, the performance of the coil unit 5 may be reduced.

[0320] Taking this into consideration, the coil unit 5 of the present embodiment has been studied as described below. First, the first shielding component 30 is divided into a plurality of shielding pieces 30P. In other words, the first shielding component 30 includes a plurality of shielding pieces 30P arranged in the same plane. The size of each shielding piece 30P observed in the axial direction can also be less than 150 mm × less than 150 mm. As a result, the formation of the first shielding component 30 with a large size becomes easy, and in addition, the possibility of rupture of each shielding piece 30P can be suppressed.

[0321] exist Figures 2 to 5B In the example shown, the first shielding member 30 includes first to fourth shielding pieces 31 to 34. Each shielding piece 31 to 34 has a quadrilateral shape. In the example shown, each shielding piece 31 to 34 contains ferrite. More specifically, each shielding piece 31 to 34 is formed of a ferrite plate.

[0322] A gap 50 is formed between adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 31. The width of the gap 50 is arbitrary, but considering the manufacturing tolerance of the shielding pieces 31 to 34, the width of the gap 50 is preferably 1 mm or more. The width of the gap 50 may be 2 mm or more, 3 mm or more, or 4 mm or more. However, from the viewpoint of suppressing the penetration of magnetic lines of force through the gap 50, the width of the gap is preferably 6 mm or less.

[0323] In the example shown in the figure, a plurality of gaps 50 are formed in the first shield member 30. Each gap 50 extends in a straight line. In the example shown in the figure, first to fourth gaps 51 to 54 are formed in the first shield member 30.

[0324] The first gap 51 extends along the second direction D2 between the first shielding small piece 31 and the fourth shielding small piece 34. The first gap 51 crosses at least a portion of the first straight portion group 11G when viewed in the axial direction. Figure 5A In the example shown, the first gap 51 crosses the first straight portion 11 of the second to eighth turns 102 to 108 when viewed in the axial direction. In other words, the first gap 51 extends from a position radially inward of the second turn 102 to the radially outer side of the eighth turn 108 when viewed in the axial direction. By arranging the shielding pieces 31 and 34 in such a manner that the first gap 51 crosses the first straight portion 11, it is possible to suppress the magnetic lines of force formed around each first straight portion 11 from reaching the second shielding member 40 through the first gap 51. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic lines of force formed around the first straight portion 11. This means that the increase in loss (heat generation) of the coil unit 5 due to the presence of the first gap 51 can be suppressed, which means that the reduction in performance of the coil unit 5 due to the presence of the first gap 51 can be suppressed.

[0325] When viewed along the axial direction, the angle formed by the first gap 51 and the first straight portion 11 of the second to eighth turns 102 to 108 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 caused by the presence of the first gap 51 can be effectively suppressed, and the reduction in performance of the coil unit 5 caused by the presence of the first gap 51 can be effectively suppressed. Figure 5A It is understood that, when viewed in the axial direction, the first gap 51 may be orthogonal to the first straight line portion 11 of the second to eighth turns 102 to 108. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the first gap 51 can be more effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the first gap 51 can be more effectively suppressed.

[0326] The second gap 52 extends along the first direction D1 between the first shielding small piece 31 and the second shielding small piece 32. The second gap 52 crosses at least a portion of the second straight portion group 12G when viewed in the axial direction. Figure 5AIn the example shown, the second gap 52 crosses the second straight portion 12 of the first to eighth turns 101 to 108 when viewed in the axial direction. In other words, the second gap 52 extends from a position radially inward of the first turn 101 to the radially outer side of the eighth turn 108 when viewed in the axial direction. By arranging the shielding pieces 31 and 32 in such a manner that the second gap 52 crosses the second straight portion 12, it is possible to suppress the magnetic lines of force formed around each second straight portion 12 from reaching the second shielding member 40 through the second gap 52. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic lines of force formed around the second straight portion 12. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the second gap 52, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the second gap 52.

[0327] When viewed along the axial direction, the angle formed by the second gap 52 and the second straight portion 12 of the first to eighth turns 101 to 108 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 caused by the presence of the second gap 52 can be effectively suppressed, and the reduction in performance of the coil unit 5 caused by the presence of the second gap 52 can be effectively suppressed. Figure 5A It is understood that, when viewed in the axial direction, the second gap 52 may be orthogonal to the second straight line portions 12 of the first to eighth turns 101 to 108. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the second gap 52 can be more effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the second gap 52 can be more effectively suppressed.

[0328] The third gap 53 extends along the second direction D2 between the second shielding small piece 32 and the third shielding small piece 33. The third gap 53 crosses at least a portion of the third straight line portion group 13G when viewed in the axial direction. Figure 5A In the example shown, the third gap 53 crosses the third straight portion 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. In other words, the third gap 53 extends from a position radially inward of the first turn 101 to the radially outer side of the eighth turn 108 when viewed in the axial direction. By arranging the shielding pieces 32 and 33 in such a manner that the third gap 53 crosses the third straight portion 13, it is possible to suppress the magnetic lines of force formed around each third straight portion 13 from reaching the second shielding member 40 through the third gap 53. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic lines of force formed around the third straight portion 13. This means that it is possible to suppress the increase in loss (heat generation) of the coil unit 5 due to the presence of the third gap 53, which means that it is possible to suppress the reduction in performance of the coil unit 5 due to the presence of the third gap 53.

[0329] When viewed along the axial direction, the angle formed by the third gap 53 and the third straight portion 13 of the first to eighth turns 101 to 108 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the third gap 53 can be effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the third gap 53 can be effectively suppressed. Figure 5A It is understood that, when viewed in the axial direction, the third gap 53 may be orthogonal to the third straight line portion 13 of the first to eighth turns 101 to 108. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the third gap 53 can be more effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the third gap 53 can be more effectively suppressed.

[0330] The fourth gap 54 extends along the first direction D1 between the third shielding small piece 33 and the fourth shielding small piece 34. The fourth gap 54 crosses at least a portion of the fourth straight line portion group 14G when viewed in the axial direction. Figure 5A In the example shown, the fourth gap 54 crosses the fourth straight portion 14 of the first to eighth turns 101 to 108 when viewed in the axial direction. In other words, the fourth gap 54 extends from a position radially inward of the first turn 101 to the radially outer side of the eighth turn 108 when viewed in the axial direction. By arranging the shielding pieces 33 and 34 in such a manner that the fourth gap 54 crosses the fourth straight portion 14, it is possible to suppress the magnetic lines of force formed around each fourth straight portion 14 from reaching the second shielding member 40 through the fourth gap 54. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic lines of force formed around the fourth straight portion 14. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the fourth gap 54, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the fourth gap 54.

[0331] When viewed along the axial direction, the angle formed by the fourth gap 54 and the fourth straight portion 14 of the first to eighth turns 101 to 108 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 caused by the presence of the fourth gap 54 can be effectively suppressed, and the reduction in performance of the coil unit 5 caused by the presence of the fourth gap 54 can be effectively suppressed. Figure 5A It is understood that, when viewed in the axial direction, the fourth gap 54 may be orthogonal to the fourth straight line portion 14 of the first to eighth turns 101 to 108. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the fourth gap 54 can be more effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the fourth gap 54 can be more effectively suppressed.

[0332] Each gap 51 to 54 extends into the area surrounded by the turn portion 101 forming the innermost circumference of the coil element 10i. In the illustrated example, the first gap 51 and the third gap 53 are positioned in the same direction D1. Therefore, the first gap 51 and the third gap 53 extend continuously in the second direction D2. In addition, the second gap 52 and the fourth gap 54 are positioned in the same direction D2. Therefore, the second gap 52 and the fourth gap 54 extend continuously in the first direction D1. However, this is not limited to this. The positions of the first gap 51 and the third gap 53 in the first direction D1 may also be different. In addition, the positions of the second gap 52 and the fourth gap 54 in the second direction D2 may also be different.

[0333] When viewed in the axial direction, the first gap 51 and the third gap 53 are formed so that their extension lines pass through the central axis C. In other words, the first gap 51 and the third gap 53 are formed at positions farthest from the second straight portion 12 and the fourth straight portion 14 of the turn portion 101 forming the innermost circumference of the coil element 10i. As a result, it is possible to effectively suppress the magnetic lines of force formed around each second straight portion 12 and each fourth straight portion 14 from reaching the second shielding member 40 through the first gap 51 and the third gap 53. As a result, it is possible to effectively suppress the increase in loss (heat generation) of the coil unit 5 due to the presence of the first gap 51 and the third gap 53, and it is possible to effectively suppress the reduction in performance of the coil unit 5 due to the presence of the first gap 51 and the third gap 53.

[0334] In addition, when viewed in the axial direction, the second gap 52 and the fourth gap 54 are formed so that their extension lines pass through the central axis C. In other words, the second gap 52 and the fourth gap 54 are formed at positions farthest from the first straight portion 11 and the third straight portion 13 of the turn portion 101 forming the innermost circumference of the coil element 10i. As a result, it is possible to effectively suppress the magnetic lines of force formed around each first straight portion 11 and each third straight portion 13 from reaching the second shielding member 40 through the second gap 52 and the fourth gap 54. As a result, it is possible to effectively suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the second gap 52 and the fourth gap 54, and it is possible to effectively suppress the reduction in the performance of the coil unit 5 due to the presence of the second gap 52 and the fourth gap 54.

[0335] (Second Shielding Member)

[0336] The second shielding member 40 is arranged on the second side of the coil 10. The second shielding member 40 shields the electromagnetic waves emitted by the coil 10 from the second side. By cutting off the electromagnetic waves emitted by the coil unit 5 by the second shielding member 40, it is possible to suppress the electromagnetic waves from affecting other electronic components, the human body, etc. As a material forming the second shielding member 40, for example, a metal such as aluminum can be used. In the case where the coil unit 5 is installed in a car, the second shielding member 40 can be a metal plate constituting the body (car body) of the car.

[0337] like Figure 4 As shown, the second shielding member 40 is configured separately from the first shielding member 30. A spacer 45 can be configured between the second shielding member 40 and the first shielding member 30. Thus, the distance between the second shielding member 40 and the first shielding member 30 can be maintained at a predetermined distance. The spacer 45 is not particularly limited as long as it is an insulating member, but is preferably a heat-conducting member. Thus, heat dissipation from the coil unit 5 can be promoted by the spacer 45. The first shielding member 30 and the second shielding member 40 can also be joined via a heat-conducting member serving as the spacer 45.

[0338] The heat-conducting component as the spacer 45 can be formed of, for example, an insulating heat-dissipating material produced by dispersing a material with high thermal conductivity in an insulating resin. In addition, when high thermal conductivity is required for the spacer 45, the spacer 45 can also be produced using the above-mentioned insulating heat-dissipating material and a metal component. For example, by sandwiching a metal block made of a metal such as aluminum with a film made of the above-mentioned insulating heat-dissipating material, a spacer 45 with high thermal conductivity can be produced. The spacer 45 produced in this way is arranged between the first shielding component 30 and the metal block in such a way that the above-mentioned film is located between the first shielding component 30 and the metal block, and between the second shielding component 40 and the metal block, thereby ensuring the insulation between the first shielding component 30 and the second shielding component 40, and effectively promoting the heat dissipation from the coil unit 5.

[0339] Here, if the second shielding member 40 is arranged close to the first shielding member 30, for example, when the distance between the second shielding member 40 and the first shielding member 30 is set to 10 mm or less, the magnetic force lines generated by the coil 10 easily reach the second shielding member 40, and thus, it is considered that eddy currents are easily generated in the second shielding member 40. If eddy currents are easily generated in the second shielding member 40, the loss of the second shielding member 40 increases, and the loss of the coil unit 5 increases. In particular, in the coil unit 5 of the present embodiment, gaps 51 to 54 are formed in the first shielding member 30. Therefore, it is considered that the magnetic force lines reach the second shielding member 40 through the gaps 51 to 54 of the first shielding member 30. Therefore, in the coil unit 5 of the present embodiment, when the second shielding member 40 is brought close to the first shielding member 30, it is considered that the loss of the coil unit 5 increases compared with the coil unit in which the gap 50 is not formed in the first shielding member 30.

[0340] However, according to the findings obtained by the inventors of the present application, by making the coil unit 5 include the magnetic resin layer 20 that is in direct contact with (or in close contact with) the second main surface 10b of the coil 10, it is possible to suppress the increase in the loss of the coil unit 5 caused by bringing the second shielding member 40 close to the first shielding member 30. Furthermore, according to the findings obtained by the inventors of the present application, by making the positional relationship of the gaps 51 to 54 between the coil 10 and the shielding pieces 31 to 34 the above-mentioned positional relationship, it is possible to suppress the increase in the loss of the coil unit 5 caused by bringing the second shielding member 40 close to the first shielding member 30. This helps to reduce the size of the coil unit 5 (especially, the size along the axial direction).

[0341] It should be noted that, when the coil unit 5 is mounted on a car, the space in which it can be installed is limited. Therefore, it is advantageous to reduce the size of the coil unit 5. Therefore, in the present embodiment, when the coil unit 5 is a power receiving coil unit installed in a car, the distance L1 between the second shielding member 40 and the first shielding member 30 may be less than 10 mm, less than 5 mm, less than 3 mm, less than 2 mm, or less than 1 mm. On the other hand, when the coil unit 5 is a power transmitting coil unit installed on a road or a parking lot, the distance L1 between the second shielding member 40 and the first shielding member 30 may be more than 10 mm, more than 15 mm, or more than 20 mm. However, the longer the distance L1 between the second shielding member 40 and the first shielding member 30, the more difficult it is to dissipate heat from the coil unit 5, and the coil unit 5 may become high temperature. Therefore, even when the coil unit 5 is installed on a road or a parking lot, the distance L1 between the second shielding member 40 and the first shielding member 30 is preferably less than 10 mm, more preferably less than 5 mm, further preferably less than 3 mm, further preferably less than 2 mm, and further preferably less than 1 mm. In addition, when the distance L1 between the second shield member 40 and the first shield member 30 is 1 mm or more, it is preferable to use the above-mentioned spacer having high thermal conductivity as the spacer 45 .

[0342] By arranging the second shielding component 40 close to the first shielding component 30, the distance L2 between the first main surface 10a of the coil 10 of this embodiment and the first side surface of the second shielding component 40 can be made less than 10 mm, less than 5 mm, or less than 3 mm.

[0343] (Connection terminal)

[0344] The first connection terminal 46 and the second connection terminal 47 can be used, for example, when connecting to the high-frequency current supply unit 1A or the conversion unit 2A. The connection between the first connection terminal 46 and the first turn portion 101 and the connection between the second connection terminal 47 and the eighth turn portion 108 are performed by ultrasonic bonding. However, the connection method is not limited, and for example, connection based on a conductive adhesive can also be used.

[0345] When the coil unit 5 is used as the power transmission coil unit, the first connection terminal 46 and the second connection terminal 47 are connected to Figure 1The high-frequency current supply unit 1A or AC power supply shown in the figure is connected. When a high-frequency current is supplied to the coil unit 5, the current can flow from the first connection terminal 46 to the coil 10, and then flow from the second connection terminal 47 to the high-frequency current supply unit 1A or AC power supply. In addition, the current can flow from the second connection terminal 47 to the coil 10, and then flow from the first connection terminal 46 to the high-frequency current supply unit 1A or AC power supply. As a result, a magnetic field including magnetic lines of force along the central axis of the coil 10 can be generated.

[0346] On the other hand, when the coil unit 5 is used as a power receiving coil unit, a high-frequency current can be generated in the coil 10 by receiving a magnetic field including magnetic force lines along the central axis of the coil 10. The high-frequency current can be supplied from the first connection terminal 46 or the second connection terminal 47 to an external device.

[0347] In the example shown in the figure, the first connection terminal 46 is connected to the inner end 10e1 of the coil 10. In other words, the first connection terminal 46 is connected to the first straight portion 11 of the first turn portion 101 forming the innermost peripheral portion of the coil element 10i. The second connection terminal 47 is connected to the outer end 10e2 of the coil 10. In other words, the second connection terminal 47 is connected to the fourth straight portion 14 of the eighth turn portion 108 forming the outermost peripheral portion of the coil element 10i.

[0348] like Figure 2 As shown, the first connection terminal 46 extends from the radial inner side to the outer side of the coil 10. The first connection terminal 46 extends radially outward from the coil 10 by crossing one of the straight section groups 11G to 14G of the coil element 10i when viewed in the axial direction. In order to ensure the insulation between the first connection terminal 46 and the coil 10 and the first shielding component 30, an insulating material may be arranged between the first connection terminal 46 and the coil 10 and the first shielding component 30. More specifically, the first connection terminal 46 may be covered with an insulating material. Similarly, an insulating material may be arranged between the second connection terminal 47 and the coil 10 and the first shielding component 30. More specifically, the second connection terminal 47 may be covered with an insulating material. As an insulating material covering the first connection terminal 46 and / or the second connection terminal 47, for example, a fluororesin may be used. Thus, the insulation between the first connection terminal 46 and / or the second connection terminal 47 and the coil 10 and the first shielding component 30 can be ensured, and heat dissipation from the first connection terminal 46 and / or the second connection terminal 47 can be effectively promoted.

[0349] like Fig. 6A As shown, when the first connection terminal 46 is connected to the inner end 10e1 of the coil 10, the first connection terminal 46 may extend overlapping with the gap 50 extending from the inner side to the outer side of the coil 10 when viewed in the axial direction. Figure 7As shown, the first connection terminal 46 may extend from the inside to the outside of the coil 10 at a height position overlapping with the shielding small piece 30P when the coil unit 5 is viewed from the side. In this case, the loss (heat generation) of the first shielding member 30 can be suppressed. Figure 7 It can be understood that the connection terminals 46 and 47 can be connected to the coil 10 via the conductive connection portion 48 .

[0350] When the first connection terminal 46 extends in the gap 50 extending from the inside to the outside of the coil 10, the angle between the straight portion 11 through which the first connection terminal 46 passes and the first connection terminal 46 as viewed in the axial direction may be, for example, 80° to 100°. Fig. 6A As shown, the first connection terminal 46 may be orthogonal to the straight portion 11. In this case, it is possible to prevent the magnetic field lines formed around the straight portion 11 from reaching the second shield member 40 through the gap 50 through which the first connection terminal 46 passes.

[0351] When the second shielding member 40 is a quadrilateral, the first connection terminal 46 and the second connection terminal 47 preferably extend from the same side of the second shielding member 40 when viewed in the axial direction (see Figure 2 In this case, it is easy to route the wiring connected to the first connection terminal 46 and the second connection terminal 47.

[0352] In addition, regardless of the shape of the second shielding member 40, as long as the first connection terminal 46 and the second connection terminal 47 are in the following positional relationship, it is easy to route the wiring connected to the first connection terminal 46 and the second connection terminal 47. Figure 6B As shown, when viewed in the axial direction, the point where the first connection terminal 46 overlaps with the outer periphery of the first shielding member 30 is set as the first point IP1. In addition, when viewed in the axial direction, the point where the second connection terminal 47 overlaps with the outer periphery of the first shielding member 30 is set as the second point IP2. Moreover, when viewed in the axial direction, the angle θ formed by the first imaginary line IL1 connecting the first point IP1 and the center axis C and the second imaginary line IL2 connecting the second point IP2 and the center axis of C is 90° or less, preferably 60° or less, more preferably 45° or less, and further preferably 30° or less.

[0353] In addition, regardless of the shape of the second shielding member 40, the distance between the first point IP1 and the second point IP2 is preferably less than 100 mm, more preferably less than 50 mm. Thus, by making the first point IP1 and the second point IP2 close to each other, it is easy to route the wiring connected to the first connection terminal 46 and the second connection terminal 47.

[0354] In addition, Figures 2 to 5BIn the example shown, the ends 10e1 and 10e2 of the coil element 10i are in the following positional relationship. That is, when the direction of the coil element 10i from the outer end 10e2 toward the inner end 10e1 around the central axis C is set as the first winding direction CD, the outer end 10e2 is offset from the inner end 10e1 in the first winding direction CD. As a result, the outer end region (at the inner end) of the coil element 10i can be prevented from being axially viewed. Figure 5B In the example shown, the fourth straight line portion 14 of the eighth turn portion intersects the first connection terminal 46 to bring the first point IP1 and the second point IP2 closer together. By preventing the outer end region of the coil element 10i from intersecting the first connection terminal 46, the loss (heat generation) of the coil unit 5 can be reduced.

[0355] It should be noted that in the above embodiment and several modifications described below, the first straight portion 11 and the fourth straight portion 14 form the ends of the coil element 10i, but the present invention is not limited thereto. Any of the first to fourth straight portions 11 to 14 may form the ends of the coil element 10i.

[0356] <<Modifications>>

[0357] It should be noted that various changes may be made to the first embodiment described above. Figures 8 to 42 , a modified example of the first embodiment is described.

[0358] First, refer to Figures 8 to 16 , a modified example of the positional relationship between the coil 10 and the gap 50 is described. Figures 8 to 16 In FIG. 4 , the first connection terminal 46 and the second connection terminal 47 are omitted from illustration.

[0359] For example, in Figure 8 In the coil unit 5 shown, the first shielding component 30 includes two shielding pieces 31-32. Each shielding piece 31-32 has a quadrilateral shape. When viewed axially, the gap 50 formed between adjacent shielding pieces 31 and 32 crosses a portion of the first straight portion group 11G and the third straight portion group 13G. The gap 50 is formed at a position overlapping with the center axis C when viewed axially. With such a coil unit 5, it is also possible to suppress an increase in the loss (heat generation) of the coil unit 5 due to the presence of the gap 50, and to suppress a reduction in the performance of the coil unit 5 due to the presence of the gap 50. It should be noted that in Figure 8 In the illustrated example, the gap 50 is orthogonal to the first straight portion group 11G and the third straight portion group 13G when viewed in the axial direction.

[0360] In addition, Fig. 9In the example shown, the first shielding component 30 includes six shielding pieces 31 to 36. Each shielding piece 31 to 36 has a quadrilateral shape. Two of the seven gaps 50 formed between adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 extend between the first straight portion group 11G and the center axis C when viewed axially. In addition, two of the above-mentioned seven gaps 50 extend between the third straight portion group 13G and the center axis C when viewed axially. By extending the gap 50 on the inner side of the first turn portion 101 forming the innermost circumference of the coil element 10i, the increase in the loss (heat generation) of the coil unit 5 due to the presence of the gap 50 can be suppressed, and the reduction in the performance of the coil unit 5 due to the presence of the gap 50 can be suppressed. It should be noted that in Fig. 9 In the illustrated example, six of the seven gaps 50 are orthogonal to any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction.

[0361] In addition, Fig.10 as well as Fig.11 In the example shown, the first shielding member 30 includes four shielding pieces 31 to 34. Each shielding piece 31 to 34 has a quadrilateral shape. One of the three gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34 crosses the first straight section group 11G when viewed in the axial direction. The gap 50 is orthogonal to the first straight section group 11G when viewed in the axial direction. In addition, one of the other two gaps 50 extends along the second straight section 12 in the second straight section group 12G when viewed in the axial direction. In addition, the other one of the other two gaps 50 extends along the fourth straight section 14 in the fourth straight section group 14. In this way, when viewed in the axial direction, a part of the plurality of gaps 50 formed in the first shielding member 30 may also extend along the straight sections 11 to 14 constituting the straight section group 11G to 14G in any of the straight section groups 11G to 14G forming the coil 10. In this case, at least an increase in loss (heat generation) of the coil unit 5 due to the presence of the gap 50 crossing the first straight portion group 11G can be suppressed, and a decrease in performance of the coil unit 5 due to the presence of the gap 50 can be suppressed.

[0362] It should be noted that according to the findings of the inventors, when the gap 50 extends along the straight portions 11 to 14 constituting the straight portion group 11G to 14G in any straight portion group 11G to 14G in the axial direction, the closer the gap 50 is to the radial center of the straight portion group 11G to 14G, the greater the increase in the loss (heat generation) of the coil unit 5 due to the existence of the gap 50. Fig.10As shown, the gap 50 extending in the second straight portion group 12G preferably extends at a position closer to the central axis C (radially inward) than the second straight portion 12 of the smallest integer number counted from the innermost second straight portion 12 (the second straight portion 12 of the first turn portion 101) among the plurality of second straight portions 12 of the second straight portion group 12G, the smallest integer being the smallest integer greater than the value obtained by dividing the total number of the plurality of second straight portions 12 by 3. Alternatively, as Fig.11 As shown, the gap 50 extending in the second straight portion group 12G preferably extends at a position on the opposite side (radially outward) to the center axis C side of the smallest integer second straight portion 12 counted from the outermost second straight portion 12 (the second straight portion 12 of the eighth turn 108) among the plurality of second straight portions 12 of the second straight portion group 12G, and the above-mentioned smallest integer is the smallest integer greater than the value obtained by dividing the total number of the plurality of second straight portions 12 by 3. Specifically, Fig.10 as well as Fig.11 In the example shown, the total number of the second straight line portions 12 of the second straight line portion group 12G is 8. The smallest integer greater than the value obtained by dividing 8 by 3 is 3. Fig.10 As shown in FIG. 1 , the gap 50 extending in the second straight portion group 12G is preferably located radially inward of the second straight portion 12 of the third turn portion 103. Alternatively, as shown in FIG. Fig.11 As shown, the gap 50 extending in the second straight portion group 12G is preferably located radially outward of the second straight portion 12 of the sixth turn portion 106 .

[0363] Likewise, if Fig.10 As shown, the gap 50 extending in the fourth straight portion group 14G preferably extends at a position closer to the central axis C (radially inward) than the fourth straight portion 14 of the smallest integer number counted from the innermost fourth straight portion 14 (the fourth straight portion 14 of the first turn portion 101) among the plurality of fourth straight portions 14 of the fourth straight portion group 14G, the smallest integer being the smallest integer greater than the value obtained by dividing the total number of the plurality of fourth straight portions 14 by 3. Alternatively, as Fig.11 As shown, the gap 50 extending in the fourth straight portion group 14G preferably extends at a position on the opposite side (radially outward) to the central axis C side of the smallest integer fourth straight portion 14 counted from the outermost fourth straight portion 14 (the fourth straight portion 14 of the eighth turn 108) among the plurality of fourth straight portions 14 of the fourth straight portion group 14G, and the above-mentioned smallest integer is the smallest integer greater than the value obtained by dividing the total number of the plurality of fourth straight portions 14 by 3. Specifically, in Fig.10 as well as Fig.11 In the example shown, the total number of the fourth straight line portions 14 of the fourth straight line portion group 14G is 8. The smallest integer greater than or equal to 8 divided by 3 is 3. Fig.10As shown in FIG. 1 , the gap 50 extending in the fourth straight portion group 14G is preferably located radially inward of the fourth straight portion 14 of the third turn portion 103. Alternatively, as shown in FIG. Fig.11 As shown, the gap 50 extending in the fourth straight portion group 14G is preferably located radially outward of the fourth straight portion 14 of the sixth turn portion 106 .

[0364] This also applies to the case where the first shielding member 30 has a gap 50 extending along the first straight portion 11 in the first straight portion group 11G as viewed in the axial direction, and a gap 50 extending along the third straight portion 13 in the third straight portion group 13G as viewed in the axial direction. Figures 12 to 16 In the example shown, the first shielding member 30 includes six shielding pieces 31 to 36. Each shielding piece 31 to 36 has a quadrilateral shape. Three of the seven gaps 50 formed between adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 cross a portion of the first straight line group 11G and / or a portion of the third straight line group 13G when viewed in the axial direction. These three gaps 50 are orthogonal to a portion of the first straight line group 11G and / or a portion of the third straight line group 13G when viewed in the axial direction. In addition, one of the other gaps 50 extends along the first straight line portion 11 in the first straight line group 11G when viewed in the axial direction. In addition, the other two of the other gaps extend along the third straight line portion 13 in the third straight line group 13G.

[0365] like Fig.12 as well as Fig.13 As shown, the gap 50 extending in the first straight portion group 11G preferably extends closer to the central axis C (radially inward) than the first straight portion 11 of the first straight portion group 11G, which is the smallest integer greater than the value obtained by dividing the total number of the first straight portions 11 by 3. Alternatively, as Fig.15 as well as Fig.16 As shown, the gap 50 extending in the first straight portion group 11G preferably extends at a position on the opposite side (radially outward) to the center axis C side of the first straight portion 11 (the first straight portion 11 of the eighth turn 108) of the outermost first straight portion 11 among the plurality of first straight portions 11 of the first straight portion group 11G, the minimum integer being the minimum integer greater than the value obtained by dividing the total number of the plurality of first straight portions 11 by 3. Specifically, Figures 12 to 16 In the example shown, the total number of the first straight line portions 11 of the first straight line portion group 11G is 8. The smallest integer greater than or equal to 8 divided by 3 is 3. Fig.12 as well as Fig.13As shown in FIG. 1 , the gap 50 extending in the first straight portion group 11G is preferably located radially inward of the first straight portion 11 of the third turn portion 103. Alternatively, as shown in FIG. Fig.15 as well as Fig.16 As shown, the gap 50 extending in the first straight portion group 11G is preferably located radially outward of the first straight portion 11 of the sixth turn portion 106 .

[0366] Likewise, if Fig.12 as well as Fig.13 As shown, the gap 50 extending in the third straight portion group 13G preferably extends at a position closer to the central axis C (radially inward) than the third straight portion 13 of the smallest integer number counted from the innermost third straight portion 13 (the third straight portion 13 of the first turn portion 101) among the plurality of third straight portions 13 of the third straight portion group 13G, where the smallest integer is the smallest integer greater than the value obtained by dividing the total number of the plurality of third straight portions 13 by 3. Alternatively, as Fig.15 as well as Fig.16 As shown, the gap 50 extending in the third straight portion group 13G preferably extends at a position on the opposite side (radially outward) to the center axis C side of the smallest integer third straight portion 13 counted from the outermost third straight portion 13 (the third straight portion 13 of the eighth turn 108) among the plurality of third straight portions 13 of the third straight portion group 13G, and the above-mentioned smallest integer is the smallest integer greater than the value obtained by dividing the total number of the plurality of third straight portions 13 by 3. Specifically, in Figures 12 to 16 In the example shown, the total number of the third straight line portions 13 of the third straight line portion group 13G is 8. The smallest integer greater than or equal to 8 divided by 3 is 3. Fig.12 as well as Fig.13 As shown in FIG. 1 , the gap 50 extending in the third straight portion group 13G is preferably located radially inward of the third straight portion 13 of the third turn portion 103. Alternatively, as shown in FIG. Fig.15 as well as Fig.16 As shown, the gap 50 extending in the third straight portion group 13G is preferably located radially outward of the third straight portion 13 of the sixth turn portion 106 .

[0367] In addition, if Figures 17 to 19 As shown, the coil 10 may also include a plurality of spiral-shaped coil elements 10j, 10jj. Figures 17 to 19 In the example shown, the coil 10 includes two first coil elements 10j and second coil elements 10jj arranged in the axial direction. The pitch P in the axial direction between the first coil element 10j and the second coil element 10jj is, for example, 5 mm or more and 40 mm or less.

[0368] In the illustrated example, each coil element 10j, 10jj includes a conductor 10E having a spiral shape. The conductor 10E includes a plurality of turns 101 to 105 arranged in the radial direction. In the illustrated example, the conductor 10E includes the first to fifth turns 101 to 105. The first to fifth turns 101 to 105 are arranged in sequence from the inner side to the outer side in the radial direction. In other words, the first turn 101 is located at the innermost side in the radial direction, and the fifth turn 105 is located at the outermost side in the radial direction. In further other words, the first turn 101 forms the innermost circumference of each coil element 10j, 10jj. In addition, the fifth turn 105 forms the outermost circumference of each coil element 10j, 10jj.

[0369] Each turn 101 to 105 of each coil element 10j, 10jj extends on an imaginary plane perpendicular to the axial direction. The first to fifth turns 101 to 105 are connected in sequence, whereby the coil elements 10j, 10jj form a spiral shape around the central axis C. In the illustrated example, each coil element 10j, 10jj (conductor 10E) is wound in a manner such that each turn 101 to 105 is approximately a quadrilateral, but is not limited to this. Each turn 101 to 105 may also be wound in a manner such that each turn 101 to 105 is approximately a polygon other than a quadrilateral. Fig.17 as well as Fig.18 It can be understood that the first to fifth turn portions 101 to 105 of the first coil element 10j are aligned with the first to fifth turn portions 101 to 105 of the second coil element 10jj in the axial direction.

[0370] Each turn portion 101 to 105 of each coil element 10j, 10jj includes a plurality of straight portions 11 to 13 arranged around the central axis C. The straight portions 11 to 13 adjacent to each other in the circumferential direction of the circle centered on the central axis C are connected to each other. In the example shown in the figure, the first to fifth turn portions 101 to 105 include a first straight portion 11 and a third straight portion 13 extending in the first direction D1, and a second straight portion 12 extending in the second direction D2. In addition, the first to fourth turn portions 101 to 104 of each coil element 10j, 10jj include a turn connection portion 16. The first to fourth turn portions 101 to 104 are connected to the second to fifth turn portions 102 to 105 at their turn connection portions 16, respectively.

[0371] The first direction D1 and the second direction D2 are not parallel to each other. In the example shown in the figure, the first direction D1 and the second direction D2 are orthogonal. In each of the turns 101 to 105, the first straight portion 11 and the third straight portion 13 are arranged so that the central axis C passes therebetween. In addition, in each of the turns 101 to 105, the second straight portion 12 and the turn connecting portion 16 are arranged so that the central axis C passes therebetween.

[0372] In addition, in each of the turns 101 to 105 of the first coil element 10j, the adjacent ends of the first straight portion 11 and the second straight portion 12 are connected via the first A intermediate curve portion 151 bent along the circumferential direction. Similarly, in each of the turns 101 to 105 of the first coil element 10j, the adjacent ends of the second straight portion 12 and the third straight portion 13 are connected via the first B intermediate curve portion 152 bent along the circumferential direction. In addition, in the first to fourth turns 101 to 104 of the first coil element 10j, the adjacent ends of the first straight portion 11 and the turn connection portion 16 are connected via the first D intermediate curve portion 154 bent along the circumferential direction. Furthermore, the turn connection portion 16 of the first to fourth turns 101 to 104 of the first coil element 10j is connected to the third straight portion 13 of the second to fifth turns 102 to 105 of the first coil element 10j via the first C intermediate curve portion 153 bent along the circumferential direction.

[0373] In addition, in each of the turns 101 to 105 of the second coil element 10jj, the adjacent ends of the first straight portion 11 and the second straight portion 12 are connected via the first A intermediate curve portion 151. Similarly, in each of the turns 101 to 105 of the second coil element 10jj, the adjacent ends of the second straight portion 12 and the third straight portion 13 are connected via the first B intermediate curve portion 152. In addition, in the first to fourth turns 101 to 104 of the second coil element 10jj, the adjacent ends of the third straight portion 13 and the turn connection portion 16 are connected via the first C intermediate curve portion 153. Furthermore, the turn connection portion 16 of the first to fourth turns 101 to 104 of the second coil element 10jj is connected to the first straight portion 11 of the second to fifth turns 102 to 105 of the second coil element 10jj via the first D intermediate curve portion 154, respectively.

[0374] from Fig.17It can be understood that the first to third straight portions 11 to 13 and the turn connection portion 16 of the first turn portion 101 of the first coil element 10j are aligned in the axial direction with the first to third straight portions 11 to 13 and the turn connection portion 16 of the first turn portion 101 of the second coil element 10jj, respectively. In addition, the first to third straight portions 11 to 13 and the turn connection portion 16 of the second turn portion 102 of the first coil element 10j are aligned in the axial direction with the first to third straight portions 11 to 13 and the turn connection portion 16 of the second turn portion 102 of the second coil element 10jj, respectively. In addition, the first to third straight portions 11 to 13 and the turn connection portion 16 of the third turn portion 103 of the first coil element 10j are aligned in the axial direction with the first to third straight portions 11 to 13 and the turn connection portion 16 of the third turn portion 103 of the second coil element 10jj, respectively. In addition, the first to third straight portions 11 to 13 and the turn connecting portion 16 of the fourth turn portion 104 of the first coil element 10j are aligned in the axial direction with the first to third straight portions 11 to 13 and the turn connecting portion 16 of the fourth turn portion 104 of the second coil element 10jj. In addition, the first to third straight portions 11 to 13 of the fifth turn portion 105 of the first coil element 10j are aligned in the axial direction with the first to third straight portions 11 to 13 of the fifth turn portion 105 of the second coil element 10jj.

[0375] from Fig.17 It can be understood that the third straight portion 13 of the first turn portion 101 located at the innermost side of the first coil element 10j is electrically connected to the first straight portion 11 of the first turn portion 101 located at the innermost side of the second coil element 10jj. In addition, the first connection terminal 46 is connected to the first straight portion 11 of the fifth turn portion 105 located at the outermost side of the first coil element 10j. In addition, the second connection terminal 47 is connected to the third straight portion 13 of the fifth turn portion 105 located at the outermost side of the second coil element 10jj.

[0376] like Fig.18 As shown, the first coil element 10j forms the first principal surface 10a of the coil 10. In addition, the second coil element 10jj forms the second principal surface 10b of the coil 10. The magnetic resin layer 20 is in direct contact with the second principal surface 10b of the coil 10. In other words, the magnetic resin layer 20 is in direct contact with the conductor 10E of the second coil element 10jj. In the example shown in the figure, the magnetic resin layer 20 is in close contact with the second principal surface 10b of the coil 10. In other words, the magnetic resin layer 20 is in close contact with the conductor 10E of the second coil element 10jj. Fig.18 In the example shown, the coil 10 is embedded in the magnetic resin layer 20. Fig.18In the example shown, the magnetic resin layer 20 is also in direct contact or close contact with the surface of the first coil element 10j facing the second side. However, the present invention is not limited thereto, and the magnetic resin layer 20 may not be in direct contact or close contact with the surface of the first coil element 10j facing the second side.

[0377] exist Figures 17 to 19 In the example shown, the first shielding member 30 includes nine shielding pieces 31 to 39. Each shielding piece 31 to 39 has a quadrilateral shape. Two of the twelve gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 37; 37, 38; 38, 31; 32, 39; 34, 39; 36, 39; 38, 39 cross the first straight line group 11G of the first coil element 10j and the second coil element 10jj when viewed in the axial direction. These two gaps 50 are orthogonal to the first straight line group 11G of the first coil element 10j and the second coil element 10jj when viewed in the axial direction. In addition, two of the twelve gaps 50 cross the second straight line group 12G of the first coil element 10j and the second coil element 10jj when viewed in the axial direction. These two gaps 50 are orthogonal to the second straight line group 12G of the first coil element 10j and the second coil element 10jj when viewed in the axial direction. In addition, two of the above 12 gaps 50 cross the third straight line group 13G of the first coil element 10j and the second coil element 10jj when viewed in the axial direction. These two gaps 50 are orthogonal to the third straight line group 13G of the first coil element 10j and the second coil element 10jj when viewed in the axial direction. In addition, four of the above 12 gaps 50 are located radially inward of the first turn portion 101 located at the innermost side of the coil elements 10j and 10jj when viewed in the axial direction.

[0378] In the above example, the first shielding member 30 includes the gap 50 that crosses any one of the straight line groups 11G to 14G of the coil elements 10i, 10j, and 10jj, but the present invention is not limited thereto. The first shielding member 30 may not include the gap 50 that crosses the straight line groups 11G to 14G. Fig. 20 In the illustrated example, the first shield member 30 does not include the gap 50 that crosses the first to fourth straight line portion groups 11G to 14G of the coil elements 10 j and 10 jj.

[0379] exist Fig. 20In the example shown, the first shielding member 30 includes nine shielding pieces 31 to 39. Each shielding piece 31 to 39 has a quadrilateral shape. Two of the twelve gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 37; 37, 38; 38, 31; 32, 39; 34, 39; 36, 39; 38, 39 cross the first A middle curve group 151G of the first coil element 10j and the second coil element 10jj when viewed in the axial direction. In addition, two of the twelve gaps 50 cross the first B middle curve group 152G of the first coil element 10j and the second coil element 10jj when viewed in the axial direction. In addition, two of the twelve gaps 50 cross the first C middle curve group 153G of the first coil element 10j and the second coil element 10jj when viewed in the axial direction. Furthermore, two of the twelve gaps 50 are the first D intermediate curve portion group 154G that crosses the first coil element 10 j and the second coil element 10 jj when viewed in the axial direction.

[0380] Of course, if Figure 21 to Figure 25 As shown, the first shield member 30 may include both the gaps 50 crossing the first to fourth straight line portion groups 11G to 14G of the coil elements 10i and 10j and the gaps 50 crossing the first A to first D intermediate curved portion groups 151G to 154G.

[0381] exist Fig. 22 as well as Fig.23 In the example shown, the first shielding member 30 includes eight shielding pieces 31 to 38. Each shielding piece 31 to 38 has a triangular shape. More specifically, each shielding piece 31 to 38 has a right triangle shape. The first to eighth gaps 51 to 58 formed between adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 37; 37, 38; 38, 31 extend radially from the central axis C. When viewed in the axial direction, the gaps 51, 53, 55, 57 respectively cross at least a portion of the first A to first D intermediate curve portion groups 151G to 154G. In the example shown in the figure, when viewed in the axial direction, the gaps 51, 53, 55, 57 respectively cross the first A to first D intermediate curve portion groups 151G to 154G. In other words, when viewed in the axial direction, the gaps 51 , 53 , 55 , and 57 extend from the radially inner side to the radially outer side of the first A to first D intermediate curved portion groups 151G to 154G, respectively.

[0382] By disposing the shielding pieces 31 and 32 in such a manner that the first gap 51 crosses the first A intermediate curve portion 151, it is possible to suppress the magnetic force lines formed around each first A intermediate curve portion 151 from reaching the second shielding member 40 through the second gap 52. As a result, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the first A intermediate curve portion 151. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the first gap 51, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the first gap 51.

[0383] When viewed along the axial direction, the angle formed by the first gap 51 and the tangent line TL1 of the first A intermediate curve group 151G can be, for example, 80° to 100°. In this case, the increase in the loss (heat generation) of the coil unit 5 caused by the presence of the first gap 51 can be effectively suppressed, and the reduction in the performance of the coil unit 5 caused by the presence of the first gap 51 can be effectively suppressed. Fig. 22 as well as Fig.23 It is understood that, when viewed in the axial direction, the first gap 51 may be orthogonal to the tangent TL1 of the first A intermediate curve portion group 151G. In this case, the increase in the loss (heat generation) of the coil unit 5 due to the presence of the first gap 51 can be more effectively suppressed, and the reduction in the performance of the coil unit 5 due to the presence of the first gap 51 can be more effectively suppressed.

[0384] Furthermore, by configuring the shielding pieces 33 and 34 in such a manner that the third gap 53 crosses the first B intermediate curve portion 152, it is possible to suppress the magnetic force lines formed around each first B intermediate curve portion 152 from reaching the second shielding member 40 through the third gap 53. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the first B intermediate curve portion 152. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the third gap 53, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the third gap 53.

[0385] When viewed along the axial direction, the angle formed by the third gap 53 and the tangent line TL2 of the first intermediate curve group 152G can be, for example, 80° to 100°. In this case, the increase in the loss (heat generation) of the coil unit 5 caused by the presence of the third gap 53 can be effectively suppressed, and the reduction in the performance of the coil unit 5 caused by the presence of the third gap 53 can be effectively suppressed. Fig. 22 as well as Fig.23It is understood that, when viewed in the axial direction, the third gap 53 may also be orthogonal to the tangent TL2 of the first B intermediate curve portion group 152G. In this case, the increase in the loss (heat generation) of the coil unit 5 due to the presence of the third gap 53 can be more effectively suppressed, and the reduction in the performance of the coil unit 5 due to the presence of the third gap 53 can be more effectively suppressed.

[0386] Furthermore, by configuring the shielding pieces 35 and 36 in such a manner that the fifth gap 55 crosses the first C intermediate curve portion 153, it is possible to suppress the magnetic force lines formed around each first C intermediate curve portion 153 from reaching the second shielding member 40 through the fifth gap 55. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the first C intermediate curve portion 153. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the fifth gap 55, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the fifth gap 55.

[0387] When viewed along the axial direction, the angle formed by the fifth gap 55 and the tangent line TL3 of the first C intermediate curve group 153G can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 caused by the presence of the fifth gap 55 can be effectively suppressed, and the reduction in performance of the coil unit 5 caused by the presence of the fifth gap 55 can be effectively suppressed. Fig. 22 as well as Fig.23 It can be understood that, when viewed in the axial direction, the fifth gap 55 may also be orthogonal to the tangent TL3 of the first C intermediate curve portion group 153G. In this case, the increase in the loss (heat generation) of the coil unit 5 due to the presence of the fifth gap 55 can be more effectively suppressed, and the reduction in the performance of the coil unit 5 due to the presence of the fifth gap 55 can be more effectively suppressed.

[0388] Furthermore, by disposing the shielding pieces 37 and 38 in such a manner that the seventh gap 57 crosses the first D intermediate curve portion 154, it is possible to suppress the magnetic force lines formed around each first D intermediate curve portion 154 from reaching the second shielding member 40 through the seventh gap 57. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the first D intermediate curve portion 154. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the seventh gap 57, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the seventh gap 57.

[0389] When viewed along the axial direction, the angle formed by the seventh gap 57 and the tangent line TL4 of the first D intermediate curve group 154G can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 caused by the presence of the seventh gap 57 can be effectively suppressed, and the reduction in performance of the coil unit 5 caused by the presence of the seventh gap 57 can be effectively suppressed. Fig. 22 as well as Fig.23 It is understood that, when viewed along the axial direction, the seventh gap 57 may also be orthogonal to the tangent TL4 of the first D intermediate curve portion group 154G. In this case, the increase in the loss (heat generation) of the coil unit 5 due to the presence of the seventh gap 57 can be more effectively suppressed, and the reduction in the performance of the coil unit 5 due to the presence of the seventh gap 57 can be more effectively suppressed.

[0390] It should be noted that in this specification, the tangent of the curve portion group refers to the tangent of the curve portions constituting the curve portion group observed along the axial direction. Therefore, the tangents TL1 to TL4 of the first A to first D intermediate curve portion groups 151G to 154G are the tangents of the first A to first D intermediate curve portions 151 to 154, respectively.

[0391] exist Fig. 22 as well as Fig.23 In the example shown, the gaps 52, 54, 58 respectively cross at least a portion of the first to third straight portion groups 11G to 13G when viewed in the axial direction. In the example shown, the gaps 52, 54, 58 respectively cross the first to third straight portion groups 11G to 13G. In other words, when viewed in the axial direction, the gaps 52, 54, 58 respectively extend from a position radially inward of the first to third straight portion groups 11G to 13G to a radially outward position.

[0392] When viewed in the axial direction, the angle formed by the eighth gap 58 and the first straight portion 11 is 80° to 100°. More specifically, the eighth gap 58 is orthogonal to the first straight portion 11. In addition, when viewed in the axial direction, the angle formed by the second gap 52 and the second straight portion 12 is 80° to 100°. More specifically, the second gap 52 is orthogonal to the second straight portion 12. In addition, when viewed in the axial direction, the angle formed by the fourth gap 54 and the third straight portion 13 is 80° to 100°. More specifically, the fourth gap 54 is orthogonal to the third straight portion 13.

[0393] And, in Fig. 22In the example shown, the sixth gap 56 crosses at least a portion of the fourth straight portion group 14G when viewed in the axial direction. In the example shown, the sixth gap 56 crosses the fourth straight portion group 14G. In other words, when viewed in the axial direction, the sixth gap 56 extends from a position radially inside the fourth straight portion group 14G to a position radially outside. When viewed in the axial direction, the angle formed by the sixth gap 56 and the fourth straight portion 14 is 80° to 100°. More specifically, the sixth gap 56 is orthogonal to the fourth straight portion 14.

[0394] exist Fig.24 as well as Fig.25 In the example shown, the angles formed by the gaps 50 crossing the first intermediate curved portion groups 151G to 154G and the tangent lines TL1 to TL4 of the first intermediate curved portion groups 151G to 154G are also 80° to 100° when viewed in the axial direction. Fig.24 as well as Fig.25 In the example shown, when viewed in the axial direction, the gap 50 that crosses the first intermediate curve group 151G to 154G is orthogonal to the tangent lines TL1 to TL4 of the first intermediate curve group 151G to 154G. In this way, as a layout (or a method of dividing the first shielding member 30) of a plurality of shielding pieces 30P in which the angle formed by the gap 50 that crosses the first intermediate curve group 151G to 154G and the tangent lines TL1 to TL4 of the first intermediate curve group 151G to 154G is 80° to 100°, various layouts (or various methods of dividing) can be adopted.

[0395] Next, Figure 26 to Figure 29 In the above example, the circumferentially adjacent straight line sections 11G, 12G; 12G, 13G; 13G, 14G; 14G, 11G are connected via the first intermediate curve section groups 151G to 154G, but the present invention is not limited thereto. Figure 26 to Figure 29 In the illustrated example, the linear portion groups 11G, 12G; 12G, 13G; 13G, 14G; 14G, 11G adjacent to each other in the circumferential direction are connected via the first intermediate linear portion groups 161G to 164G.

[0396] exist Figure 26 to Figure 29 In the example shown, the coil element 10i is octagonal in shape as a whole. The coil element 10i (conductor 10E) is wound so that each of the turns 101 to 108 forms a substantially octagonal shape.

[0397] exist Figure 26 to Figure 29In the example shown, the first to eighth turn portions 101 to 108 include first intermediate straight portions 161 to 164 in addition to the first to fourth straight portions 11 to 14. The first A intermediate straight portion 161 and the first C intermediate straight portion 163 extend along the third direction D3. The third direction D3 is not parallel to any of the first to second directions D1 to D2. The first B intermediate straight portion 162 and the first D intermediate straight portion 164 extend along the fourth direction D4. The fourth direction D4 is not parallel to any of the first to third directions D1 to D3.

[0398] In each of the turns 101 to 108, the adjacent ends of the first straight portion 11 and the second straight portion 12 are connected via the first A intermediate straight portion 161. Similarly, in each of the turns 101 to 108, the adjacent ends of the second straight portion 12 and the third straight portion 13 are connected via the first B intermediate straight portion 162. In addition, in each of the turns 101 to 108, the adjacent ends of the third straight portion 13 and the fourth straight portion 14 are connected via the first C intermediate straight portion 163.

[0399] Furthermore, the fourth straight portion 14 of the radially adjacent turns 101, 102; ...; 107, 108 and the adjacent ends of the first straight portion 11 are connected via the first D intermediate straight portion 164. For example, the fourth straight portion 14 of the first turn 101 and the adjacent ends of the first straight portion 11 of the second turn 102 are connected via the first D intermediate straight portion 164. In addition, the fourth straight portion 14 of the second turn 102 and the adjacent ends of the first straight portion 11 of the third turn 103 are connected via the first D intermediate straight portion 164.

[0400] The first A intermediate straight portions 161 of the plurality of turns 101 to 108 are arranged in the radial direction to form a first A intermediate straight portion group 161G. In addition, the first B intermediate straight portions 162 of the plurality of turns 101 to 108 are arranged in the radial direction to form a first B intermediate straight portion group 162G. In addition, the first C intermediate straight portions 163 of the plurality of turns 101 to 108 are arranged in the radial direction to form a first C intermediate straight portion group 163G. In addition, the first D intermediate straight portions 164 of the plurality of turns 101 to 108 are arranged in the radial direction to form a first D straight portion group 164G. The first intermediate straight portions 161, 161; 162, 162; 163, 163; 164, 164 adjacent in the radial direction are separated from each other in the radial direction. The first A to first D intermediate straight portion groups 161G to 164G are parallel straight portion groups composed of the plurality of first A to first D intermediate straight portions 161 to 164, respectively.

[0401] As described above, the coil element 10i is octagonal in shape as a whole. The coil element 10i (conductor 10E) is wound in such a way that each turn portion 101 to 108 is roughly octagonal. In other words, the coil element 10i includes 8 straight line portion groups 11 to 14, 161 to 164 extending along the 8 sides of the octagon. In the example shown in the figure, when viewed in the axial direction, the angle formed by the first straight line portion 11 and the first A intermediate straight line portion 161 is 125° to 145°. In addition, when viewed in the axial direction, the angle formed by the first A intermediate straight line portion 161 and the second straight line portion 12 is 125° to 145°. In addition, when viewed in the axial direction, the angle formed by the second straight line portion 12 and the first B intermediate straight line portion 162 is 125° to 145°. In addition, when viewed in the axial direction, the angle formed by the first B intermediate straight line portion 162 and the third straight line portion 13 is 125° to 145°. In addition, when viewed in the axial direction, the angle formed by the third straight portion 13 and the first C intermediate straight portion 163 is 125° to 145°. In addition, when viewed in the axial direction, the angle formed by the first C intermediate straight portion 163 and the fourth straight portion 14 is 125° to 145°. In addition, when viewed in the axial direction, the angle formed by the fourth straight portion 14 and the first D intermediate straight portion 164 is 125° to 145°. In addition, when viewed in the axial direction, the angle formed by the first D intermediate straight portion 164 and the first straight portion 11 is 125° to 145°.

[0402] In particular, Figure 26 to Figure 29 In the example shown, the angle between the first straight portion 11 and the first A intermediate straight portion 161 when viewed in the axial direction is 135°. In addition, the angle between the first A intermediate straight portion 161 and the second straight portion 12 when viewed in the axial direction is 135°. In addition, the angle between the second straight portion 12 and the first B intermediate straight portion 162 when viewed in the axial direction is 135°. In addition, the angle between the first B intermediate straight portion 162 and the third straight portion 13 when viewed in the axial direction is 135°. In addition, the angle between the third straight portion 13 and the first C intermediate straight portion 163 when viewed in the axial direction is 135°. In addition, the angle between the first C intermediate straight portion 163 and the fourth straight portion 14 when viewed in the axial direction is 135°. In addition, the angle between the fourth straight portion 14 and the first D intermediate straight portion 164 when viewed in the axial direction is 135°. In addition, the angle between the first D intermediate straight portion 164 and the first straight portion 11 when viewed in the axial direction is 135°.

[0403] And, in Figure 26 to Figure 29 In the example shown, the coil element 10i is in the shape of a regular octagon as a whole. The coil element 10i (conductor 10E) is wound so that each turn portion 101 to 108 is substantially in the shape of a regular octagon. In other words, the coil element 10i includes eight straight line portion groups 11 to 14, 161 to 164 extending along the eight sides of the regular octagon. This can improve the performance of the coil 10.

[0404] It should be noted that the linear portions 11 to 14 and the first intermediate linear portions 161 to 164 adjacent to each other in the circumferential direction may also be connected via a curved portion.

[0405] exist Fig.26 In the example shown, the first shielding member 30 is Figures 2 to 5B The example shown also includes first to fourth shielding pieces 31 to 34. Each shielding piece 31 to 34 has a quadrilateral shape. First to fourth gaps 51 to 54 are formed in the first shielding member 30. When viewed in the axial direction, the first to fourth gaps 51 to 54 respectively cross at least a portion of the first to fourth straight line portion groups 11G to 14G. Fig.26 In the illustrated example, the first to fourth gaps 51 to 54 respectively cross the first to fourth straight portion groups 11G to 14G when viewed in the axial direction.

[0406] exist Fig.26 In the example shown, when viewed in the axial direction, the angle formed by the first gap 51 and the first straight portion 11 of the first straight portion group 11G can be, for example, 80° to 100°. Similarly, when viewed in the axial direction, the angle formed by the second gap 52 and the second straight portion 12 of the second straight portion group 12G can be, for example, 80° to 100°. In addition, when viewed in the axial direction, the angle formed by the third gap 53 and the third straight portion 13 of the third straight portion group 13G can be, for example, 80° to 100°. In addition, when viewed in the axial direction, the angle formed by the fourth gap 54 and the fourth straight portion 14 of the fourth straight portion group 14G can be, for example, 80° to 100°.

[0407] exist Fig.26 In the example shown, the first gap 51 may be orthogonal to the first straight portion 11 of the first straight portion group 11G when viewed in the axial direction. Also, the second gap 52 may be orthogonal to the second straight portion 12 of the second straight portion group 12G when viewed in the axial direction. Also, the third gap 53 may be orthogonal to the third straight portion 13 of the third straight portion group 13G when viewed in the axial direction. Also, the fourth gap 54 may be orthogonal to the fourth straight portion 14 of the fourth straight portion group 14G when viewed in the axial direction.

[0408] exist Fig. 27 In the example shown, the first shielding member 30 includes 12 shielding pieces 30P. Seventeen gaps 50 are formed in the first shielding member 30. Fig. 27 In the example shown, 14 of the 17 gaps 50 cross at least a portion of the first to fourth straight line group 11G to 14G and / or the first A to first D intermediate straight line group 161G to 164G when viewed in the axial direction. Two of the 14 gaps 50 cross the first straight line group 11G or the third straight line group 13G. Fig. 27In the example shown, the angle between the gap 50 that crosses the first straight portion group 11G and the first straight portion group 11G is 80° to 100°, more specifically 90°, when viewed in the axial direction. Fig. 27 In the example shown, the angle formed between the gap 50 crossing the third straight portion group 13G and the third straight portion group 13G, as viewed in the axial direction, is 80° to 100°, more specifically, 90°.

[0409] exist Fig. 27 In the example shown, one of the 17 gaps 50 extends along the second straight portion group 12G in the second straight portion group 12G. The gap 50 extending in the second straight portion group 12G extends at a position closer to the central axis C side (radially inward) than the second straight portion 12 of the smallest integer number counted from the innermost second straight portion 12 (the second straight portion 12 of the first turn portion 101) among the plurality of second straight portions 12 of the second straight portion group 12G, the smallest integer being the smallest integer greater than the value obtained by dividing the total number of the plurality of second straight portions 12 by 3.

[0410] exist Fig. 27 In the example shown, one of the 17 gaps 50 extends along the second straight portion group 14G in the fourth straight portion group 14G. The gap 50 extending in the fourth straight portion group 14G extends at a position closer to the central axis C (radially inward) than the fourth straight portion 14 of the smallest integer number counted from the innermost fourth straight portion 14 (the fourth straight portion 14 of the first turn portion 101) among the plurality of fourth straight portions 14 of the fourth straight portion group 14G, the smallest integer being the smallest integer greater than the value obtained by dividing the total number of the plurality of fourth straight portions 14 by 3.

[0411] exist Fig. 27 In the example shown, one of the 17 gaps 50 does not cross the coil 10 .

[0412] exist Fig.28In the example shown, the first shielding member 30 includes eight shielding pieces 31 to 38. Each shielding piece 31 to 38 has a triangular shape. More specifically, each shielding piece 31 to 38 has a right triangle shape. The first to eighth gaps 51 to 58 formed between adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 37; 37, 38; 38, 31 extend radially from the central axis C. When viewed in the axial direction, the gaps 51, 53, 55, 57 respectively cross at least a portion of the first A to first D intermediate straight line group 161G to 164G. In the example shown in the figure, when viewed in the axial direction, the gaps 51, 53, 55, 57 respectively cross the first A to first D intermediate straight line group 161G to 164G. In other words, when viewed in the axial direction, the gaps 51 , 53 , 55 , and 57 extend from the radially inner side to the radially outer side of the first A to first D intermediate straight portion groups 161G to 164G, respectively.

[0413] By disposing the shielding pieces 31 and 32 in such a manner that the first gap 51 crosses the first A intermediate straight line portion 161, it is possible to suppress the magnetic force lines formed around each first A intermediate straight line portion 161 from reaching the second shielding member 40 through the first gap 51. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the first A intermediate straight line portion 161. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the second gap 52, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the first gap 51.

[0414] When viewed along the axial direction, the angle between the first gap 51 and the first A intermediate straight line portion 161 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the first gap 51 can be effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the first gap 51 can be effectively suppressed. Fig.28 It is understood that, when viewed in the axial direction, the first gap 51 may be orthogonal to the first A intermediate straight line portion 161. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the first gap 51 can be more effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the first gap 51 can be more effectively suppressed.

[0415] Furthermore, by disposing the shielding pieces 33 and 34 in such a manner that the third gap 53 crosses the first B intermediate straight line portion 162, it is possible to suppress the magnetic force lines formed around each first B intermediate straight line portion 162 from reaching the second shielding member 40 through the third gap 53. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the first B intermediate straight line portion 162. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the third gap 53, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the third gap 53.

[0416] When viewed along the axial direction, the angle between the third gap 53 and the first intermediate straight line portion 162 may be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the third gap 53 can be effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the third gap 53 can be effectively suppressed. Fig.28 It can be understood that, when viewed in the axial direction, the third gap 53 may also be orthogonal to the first B intermediate straight line portion 162. In this case, the increase in the loss (heat generation) of the coil unit 5 due to the presence of the third gap 53 can be more effectively suppressed, and the reduction in the performance of the coil unit 5 due to the presence of the third gap 53 can be more effectively suppressed.

[0417] Furthermore, by disposing the shielding pieces 35 and 36 in such a manner that the fifth gap 55 crosses the first C intermediate straight line portion 163, it is possible to suppress the magnetic force lines formed around each first C intermediate straight line portion 163 from reaching the second shielding member 40 through the fifth gap 55. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the first C intermediate straight line portion 163. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the fifth gap 55, and it means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the fifth gap 55.

[0418] When viewed along the axial direction, the angle between the fifth gap 55 and the first C intermediate straight line portion 163 may be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the fifth gap 55 can be effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the fifth gap 55 can be effectively suppressed. Fig.28 It can be understood that, viewed along the axial direction, the fifth gap 55 may also be orthogonal to the first C intermediate straight line portion 163. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the fifth gap 55 can be more effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the fifth gap 55 can be more effectively suppressed.

[0419] Furthermore, by disposing the shielding pieces 37 and 38 in such a manner that the seventh gap 57 crosses the first D intermediate straight line portion 164, it is possible to suppress the magnetic force lines formed around each first D intermediate straight line portion 164 from reaching the second shielding member 40 through the seventh gap 57. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the first D intermediate straight line portion 164. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the seventh gap 57, and it means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the seventh gap 57.

[0420] When viewed along the axial direction, the angle between the seventh gap 57 and the first D intermediate straight line portion 164 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the seventh gap 57 can be effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the seventh gap 57 can be effectively suppressed. Fig.28 It can be understood that, when viewed in the axial direction, the seventh gap 57 may be orthogonal to the first D intermediate straight line portion 164. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the seventh gap 57 can be more effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the seventh gap 57 can be more effectively suppressed.

[0421] exist Fig.28 In the example shown, the gaps 58, 52, 54, 56 respectively cross at least a portion of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. In the example shown, the gaps 58, 52, 54, 56 respectively cross the first to fourth straight portion groups 11G to 14G. In other words, when viewed in the axial direction, the gaps 58, 52, 54, 56 respectively extend from a position radially inward of the first to fourth straight portion groups 11G to 14G to a radially outward position.

[0422] When viewed in the axial direction, the angle formed by the eighth gap 58 and the first straight portion 11 is 80° to 100°. More specifically, the eighth gap 58 is orthogonal to the first straight portion 11. In addition, when viewed in the axial direction, the angle formed by the second gap 52 and the second straight portion 12 is 80° to 100°. More specifically, the second gap 52 is orthogonal to the second straight portion 12. In addition, when viewed in the axial direction, the angle formed by the fourth gap 54 and the third straight portion 13 is 80° to 100°. More specifically, the fourth gap 54 is orthogonal to the third straight portion 13. In addition, when viewed in the axial direction, the angle formed by the sixth gap 56 and the fourth straight portion 14 is 80° to 100°. More specifically, the sixth gap 56 is orthogonal to the fourth straight portion 14.

[0423] exist Fig.29In the example shown, the angle formed between the gap 50 crossing the first intermediate straight portion group 161G to 164G and the first intermediate straight portions 161 to 164 is also 80° to 100° when viewed in the axial direction. Fig.28 In the example shown, when viewed in the axial direction, the gap 50 crossing the first intermediate straight portion group 161G to 164G is orthogonal to the first intermediate straight portions 161 to 164. In this way, various layouts (or various division methods) can be adopted as the layout of the plurality of shielding small pieces 30P (or the division method of the first shielding member 30) in which the angle formed by the gap 50 crossing the first intermediate straight portion group 161G to 164G and the first intermediate straight portions 161 to 164 is 80° to 100°.

[0424] Next, Figure 30 to Figure 33 The modified example shown is explained below. Figure 30 to Figure 33 In the example shown, the coil 10 and Figures 17 to 19 The coil 10 shown also includes a plurality of spiral-shaped coil elements 10j, 10jj.

[0425] Figure 30 to Figure 33 The coil elements 10j, 10jj and Figure 26 to Figure 29 The coil element 10i shown is similarly octagonal in shape as a whole. The coil elements 10j and 10jj (conductor 10E) are wound so that each of the turns 101 to 108 forms a substantially octagonal shape.

[0426] exist Figure 30 to Figure 33 In the example shown, the first to fifth turn portions 101 to 105 of each coil element 10j, 10jj include first intermediate straight portions 161 to 164 in addition to the first to third straight portions 11 to 13 and the plurality of turn connection portions 16. The first A intermediate straight portion 161 and the first C intermediate straight portion 163 extend along the third direction D3. The third direction D3 is not parallel to any of the first to second directions D1 to D2. The first B intermediate straight portion 162 and the first D intermediate straight portion 164 extend along the fourth direction D4. The fourth direction D4 is not parallel to any of the first to third directions D1 to D3.

[0427] In each of the turns 101 to 105 of each coil element 10j, 10jj, the adjacent ends of the first straight portion 11 and the second straight portion 12 are connected via the first A intermediate straight portion 161. Similarly, in each of the turns 101 to 105 of each coil element 10j, 10jj, the adjacent ends of the second straight portion 12 and the third straight portion 13 are connected via the first B intermediate straight portion 162. In addition, in each of the turns 101 to 105 of each coil element 10j, 10jj, the adjacent ends of the third straight portion 13 and the plurality of turn connecting portions 16 are connected via the first C intermediate straight portion 163. In addition, in each of the turns 101 to 105 of each coil element 10j, 10jj, the adjacent ends of the first straight portion 11 and the plurality of turn connecting portions 16 are connected via the first D intermediate straight portion 164.

[0428] exist Figure 30 to Figure 33 In the example shown, the first A intermediate straight portions 161 of the plurality of turns 101 to 105 are also arranged in the radial direction to form a first A intermediate straight portion group 161G. In addition, the first B intermediate straight portions 162 of the plurality of turns 101 to 105 are arranged in the radial direction to form a first B intermediate straight portion group 162G. In addition, the first C intermediate straight portions 163 of the plurality of turns 101 to 105 are arranged in the radial direction to form a first C intermediate straight portion group 163G. In addition, the first D intermediate straight portions 164 of the plurality of turns 101 to 105 are arranged in the radial direction to form a first D straight portion group 164G. The first intermediate straight portions 161, 161; 162, 162; 163, 163; 164, 164 adjacent in the radial direction are separated from each other in the radial direction. The first A to first D intermediate straight portion groups 161G to 164G are parallel straight line groups composed of the plurality of first A to first D intermediate straight portions 161 to 164, respectively.

[0429] As described above, the coil elements 10j and 10jj are octagonal in shape as a whole. The coil elements 10j and 10jj (conductor 10E) are wound in such a way that each turn portion 101 to 105 is substantially octagonal. In other words, the coil elements 10j and 10jj include 7 straight portion groups 11 to 13, 161 to 164 extending along 7 of the 8 sides of the octagon. In the example shown in the figure, the angle formed by the first straight portion 11 and the first A intermediate straight portion 161 is 125° to 145° when viewed in the axial direction. In addition, the angle formed by the first A intermediate straight portion 161 and the second straight portion 12 is 125° to 145° when viewed in the axial direction. In addition, the angle formed by the second straight portion 12 and the first B intermediate straight portion 162 is 125° to 145° when viewed in the axial direction. In addition, the angle formed by the first B intermediate straight portion 162 and the third straight portion 13 is 125° to 145° when viewed in the axial direction. In addition, the angle between the third straight portion 13 and the first C intermediate straight portion 163 when viewed in the axial direction is 125° to 145°. In addition, the angle between the first D intermediate straight portion 164 and the first straight portion 11 when viewed in the axial direction is 125° to 145°.

[0430] In particular, Figure 30 to Figure 33 In the example shown, the angle between the first straight portion 11 and the first A intermediate straight portion 161 when viewed in the axial direction is 135°. In addition, the angle between the first A intermediate straight portion 161 and the second straight portion 12 when viewed in the axial direction is 135°. In addition, the angle between the second straight portion 12 and the first B intermediate straight portion 162 when viewed in the axial direction is 135°. In addition, the angle between the first B intermediate straight portion 162 and the third straight portion 13 when viewed in the axial direction is 135°. In addition, the angle between the third straight portion 13 and the first C intermediate straight portion 163 when viewed in the axial direction is 135°. In addition, the angle between the first D intermediate straight portion 164 and the first straight portion 11 when viewed in the axial direction is 135°.

[0431] And, in Figure 30 to Figure 33 In the example shown, the coil elements 10j and 10jj are in the shape of a regular octagon as a whole. The coil elements 10j and 10jj (conductor 10E) are wound in such a way that each turn portion 101 to 105 is substantially in the shape of a regular octagon. In other words, the coil elements 10j and 10jj include 7 straight line portion groups 11 to 13, 161 to 164 extending along 7 of the 8 sides of the regular octagon. Thus, the performance of the coil 10 can be improved.

[0432] It should be noted that in Figure 30 to Figure 33In the example shown, the circumferentially adjacent straight portions 11 to 13 and the first intermediate straight portions 161 to 164 may also be connected by a curved portion. In addition, the circumferentially adjacent first C intermediate straight portion 163 and the turn connecting portion 16 may also be connected by a curved portion. In addition, the circumferentially adjacent first D intermediate straight portion 164 and the turn connecting portion 16 may also be connected by a curved portion.

[0433] exist Fig.30 In the example shown, the first shielding member 30 includes nine shielding pieces 30P. Twelve gaps 50 are formed in the first shielding member 30. Fig.30 In the example shown, the twelve gaps 50 cross at least a portion of the first to third straight line portion groups 11G to 13G and / or the first A to first D intermediate straight line portion groups 161G to 164G of each coil element 10j, 10jj when viewed in the axial direction.

[0434] exist Fig.31 In the example shown, the first shielding member 30 includes 12 shielding pieces 30P. Seventeen gaps 50 are formed in the first shielding member 30. Fig.31 In the example shown, 13 of the 17 gaps 50 cross at least a portion of the first to third straight line groups 11G to 13G and / or the first A to first D intermediate straight line groups 161G to 164G of each coil element 10j, 10jj when viewed in the axial direction. One of the 13 gaps 50 crosses the second straight line group 12G of each coil element 10j, 10jj. Fig.31 In the example shown, the angle formed between the gap 50 crossing the second straight portion group 12G and the second straight portion group 12G, as viewed in the axial direction, is 80° to 100°, more specifically, 90°.

[0435] exist Fig.31 In the example shown, one of the 17 gaps 50 extends along the first straight portion group 11G in the first straight portion group 11G of each coil element 10j, 10jj. The gap 50 extending in the first straight portion group 11G extends at a position closer to the central axis C side (radially inward) than the first straight portion 11 of the smallest integer number counted from the innermost first straight portion 11 (the first straight portion 11 of the first turn portion 101) among the plurality of first straight portions 11 of the first straight portion group 11G, the smallest integer being a value greater than or equal to the total number of the plurality of first straight portions 11 divided by 3.

[0436] exist Fig.31In the example shown, one of the 17 gaps 50 extends along the third straight line group 13G in the third straight line group 13G of each coil element 10j, 10jj. The gap 50 extending in the third straight line group 13G extends at a position closer to the central axis C side (radially inward) than the third straight line portion 13 of the smallest integer number counted from the innermost third straight line portion 13 (the third straight line portion 13 of the first turn portion 101) among the plurality of third straight line portions 13 of the third straight line group 13G, the smallest integer being the smallest integer greater than the value obtained by dividing the total number of the plurality of third straight line portions 13 by 3.

[0437] exist Fig.32 In the example shown, Fig.28 Similarly to the example shown, the first shielding member 30 includes eight shielding pieces 31 to 38. Each shielding piece 31 to 38 has a triangular shape. More specifically, each shielding piece 31 to 38 has a right triangle shape. The first to eighth gaps 51 to 58 formed between adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 37; 37, 38; 38, 31 extend radially from the central axis C. When viewed in the axial direction, the gaps 51, 53, 55, 57 respectively cross at least a portion of the first A to first D intermediate straight line portion groups 161G to 164G of each coil element 10j, 10jj. In the example shown in the figure, when viewed in the axial direction, the gaps 51, 53, 55, 57 respectively cross the first A to first D intermediate straight line portion groups 161G to 164G of each coil element 10j, 10jj. In other words, when viewed in the axial direction, the gaps 51, 53, 55, and 57 extend from the radially inner side to the radially outer side of the first A to first D intermediate straight portion groups 161G to 164G of each coil element 10j and 10jj, respectively. Thus, it is possible to prevent the magnetic field lines formed around each first intermediate straight portion 161 to 164 of each coil element 10j and 10jj from reaching the second shielding member 40 through the gaps 51, 53, 55, or 57 that cross the first intermediate straight portion 161 to 164.

[0438] When viewed in the axial direction, the angle between the first gap 51 and the first A intermediate straight line portion 161 of each coil element 10j, 10jj may be, for example, 80° to 100°. Fig.32 It can be understood that, when viewed in the axial direction, the first gap 51 may also be orthogonal to the first A intermediate straight line portion 161 of each coil element 10j, 10jj.

[0439] When viewed in the axial direction, the angle between the third gap 53 and the first B intermediate straight line portion 162 of each coil element 10j, 10jj may be, for example, 80° to 100°. Fig.32It can be understood that, when viewed in the axial direction, the third gap 53 may also be orthogonal to the first B intermediate straight line portion 162 of each coil element 10j, 10jj.

[0440] When viewed in the axial direction, the angle between the fifth gap 55 and the first C-intermediate straight line portion 163 of each coil element 10j, 10jj may be, for example, 80° to 100°. Fig.32 It can be understood that, viewed in the axial direction, the fifth gap 55 may also be orthogonal to the first C-intermediate straight line portion 163 of each coil element 10j, 10jj.

[0441] When viewed in the axial direction, the angle between the seventh gap 57 and the first D intermediate straight line portion 164 of each coil element 10j, 10jj may be, for example, 80° to 100°. Fig.32 It can be understood that, when viewed in the axial direction, the seventh gap 57 may also be orthogonal to the first D intermediate straight line portion 164 of each coil element 10j, 10jj.

[0442] exist Fig.32 In the example shown, when viewed in the axial direction, the gaps 58, 52, and 54 respectively cross at least a portion of the first to third straight line groups 11G to 13G of each coil element 10j and 10jj. In the example shown, the gaps 58, 52, and 54 respectively cross the first to third straight line groups 11G to 13G of each coil element 10j and 10jj. In other words, when viewed in the axial direction, the gaps 58, 52, and 54 respectively extend from a position radially inward of the first to third straight line groups 11G to 13G of each coil element 10j and 10jj to a radially outer side.

[0443] When viewed in the axial direction, the angle formed by the eighth gap 58 and the first straight portion 11 of each coil element 10j, 10jj is 80° to 100°. More specifically, the eighth gap 58 is orthogonal to the first straight portion 11 of each coil element 10j, 10jj. In addition, when viewed in the axial direction, the angle formed by the second gap 52 and the second straight portion 12 of each coil element 10j, 10jj is 80° to 100°. More specifically, the second gap 52 is orthogonal to the second straight portion 12 of each coil element 10j, 10jj. In addition, when viewed in the axial direction, the angle formed by the fourth gap 54 and the third straight portion 13 of each coil element 10j, 10jj is 80° to 100°. More specifically, the fourth gap 54 is orthogonal to the third straight portion 13 of each coil element 10j, 10jj.

[0444] exist Fig.33 In the example shown, when viewed in the axial direction, the angle formed between the gap 50 that crosses the first intermediate straight portion group 161G to 164G of each coil element 10j, 10jj and the first intermediate straight portion 161 to 164 is 80° to 100°. Fig.33In the example shown, when viewed in the axial direction, the gaps 50 that cross the first intermediate straight portion groups 161G to 164G of the coil elements 10j and 10jj are orthogonal to the first intermediate straight portions 161 to 164. In this way, as a layout (or a method of dividing the first shielding member 30) of a plurality of shielding small pieces 30P in which the angle formed by the gaps 50 that cross the first intermediate straight portion groups 161G to 164G of the coil elements 10j and 10jj and the first intermediate straight portions 161 to 164 is 80° to 100°, various layouts (or various methods of dividing) can be adopted.

[0445] Next, Fig.34 as well as Fig.35 The modified example shown is explained below. Fig.34 as well as Fig.35 In the illustrated example, the first intermediate straight portion groups 161G, 162G, 163G, and 164G are connected to the straight portion groups 12G, 13G, 14G, and 11G via the second intermediate straight portion groups 171G, 172G, 173G, and 174G.

[0446] exist Fig.34 as well as Fig.35 In the example shown, the coil element 10i includes a conductor 10E having a spiral shape. The conductor 10E includes a plurality of turns 101 to 107 arranged in the radial direction. In the example shown, the conductor 10E includes the first to seventh turns 101 to 107. The first to seventh turns 101 to 107 are arranged in sequence from the inner side to the outer side in the radial direction. In other words, the first turn 101 is located at the innermost side in the radial direction, and the seventh turn 107 is located at the outermost side in the radial direction. In further other words, the first turn 101 forms the innermost circumference of the coil element 10i. In addition, the seventh turn 107 forms the outermost circumference of the coil element 10i.

[0447] Each of the turns 101 to 107 of the coil element 10i extends on a virtual plane perpendicular to the axial direction. The first to seventh turns 101 to 107 are connected in sequence, so that the coil element 10i forms a spiral shape around the central axis C.

[0448] exist Fig.34 as well as Fig.35 In the example shown, the coil element 10i is in a dodecagonal shape as a whole. The coil element 10i (conductor 10E) is wound so that each of the turns 101 to 107 forms a substantially dodecagonal shape.

[0449] Each turn portion 101 to 107 of the coil element 10i includes a plurality of straight portions 11 to 14 arranged around the central axis C. The straight portions 11 to 14 adjacent to each other in the circumferential direction of a circle centered on the central axis C are connected to each other. In the example shown in the figure, the first to seventh turn portions 101 to 107 include a first straight portion 11 and a third straight portion 13 extending in the first direction D1, and a second straight portion 12 and a fourth straight portion 14 extending in the second direction D2.

[0450] The first direction D1 and the second direction D2 are not parallel to each other. Fig.34 as well as Fig.35 In the example shown, the first direction D1 and the second direction D2 are orthogonal. In each of the turns 101 to 107, the first straight portion 11 and the third straight portion 13 are arranged so that the central axis C passes therebetween. In addition, in each of the turns 101 to 107, the second straight portion 12 and the fourth straight portion 14 are arranged so that the central axis C passes therebetween.

[0451] exist Fig.34 as well as Fig.35 In the example shown, the first to seventh turn portions 101 to 107 include first intermediate straight portions 161 to 164 and second intermediate straight portions 171 to 174 in addition to the first to fourth straight portions 11 to 14. The first A intermediate straight portion 161 and the first C intermediate straight portion 163 extend along the third direction D3. The third direction D3 is not parallel to any of the first to second directions D1 to D2. The first B intermediate straight portion 162 and the first D intermediate straight portion 164 extend along the fourth direction D4. The fourth direction D4 is not parallel to any of the first to third directions D1 to D3. The second A intermediate straight portion 171 and the second C intermediate straight portion 173 extend along the fifth direction D5. The fifth direction D5 is not parallel to any of the first to fourth directions D1 to D4. The second B intermediate straight portion 172 and the second D intermediate straight portion 174 extend along the sixth direction D6. The sixth direction D6 is not parallel to any of the first to fifth directions D1 to D5.

[0452] In each of the turns 101 to 107 , the adjacent ends of the first straight portion 11 and the second straight portion 12 are connected via the first A intermediate straight portion 161 . In each of the turns 101 to 107 , the adjacent ends of the first A intermediate straight portion 161 and the second straight portion 12 are connected via the second A intermediate straight portion 171 .

[0453] In each of the turns 101-107, the adjacent ends of the second straight portion 12 and the third straight portion 13 are connected via the first B intermediate straight portion 162. In each of the turns 101-107, the adjacent ends of the first B intermediate straight portion 162 and the third straight portion 13 are connected via the second B intermediate straight portion 172.

[0454] In each of the turns 101 to 107 , the adjacent ends of the third straight portion 13 and the fourth straight portion 14 are connected via the first C-intermediate straight portion 163 . In each of the turns 101 to 107 , the adjacent ends of the first C-intermediate straight portion 163 and the fourth straight portion 14 are connected via the second C-intermediate straight portion 173 .

[0455] Furthermore, the fourth straight portion 14 of the radially adjacent turns 101, 102; ...; 106, 107 and the adjacent ends of the first straight portion 11 are connected via the first D intermediate straight portion 164. In addition, the first D intermediate straight portion 164 and the adjacent ends of the first straight portion 11 of the radially adjacent turns 101, 102; ...; 106, 107 are connected via the second D intermediate straight portion 174. For example, the fourth straight portion 14 of the first turn 101 and the adjacent ends of the first straight portion 11 of the second turn 102 are connected via the first D intermediate straight portion 164 and the second D intermediate straight portion 174. In addition, the fourth straight portion 14 of the second turn 102 and the adjacent ends of the first straight portion 11 of the third turn 103 are connected via the first D intermediate straight portion 164 and the second D intermediate straight portion 174.

[0456] The first A intermediate straight portions 161 of the plurality of turns 101 to 107 are arranged in the radial direction to form a first A intermediate straight portion group 161G. In addition, the first B intermediate straight portions 162 of the plurality of turns 101 to 107 are arranged in the radial direction to form a first B intermediate straight portion group 162G. In addition, the first C intermediate straight portions 163 of the plurality of turns 101 to 107 are arranged in the radial direction to form a first C intermediate straight portion group 163G. In addition, the first D intermediate straight portions 164 of the plurality of turns 101 to 107 are arranged in the radial direction to form a first D straight portion group 164G. The first intermediate straight portions 161, 161; 162, 162; 163, 163; 164, 164 adjacent in the radial direction are separated from each other in the radial direction. The first A to first D intermediate straight portion groups 161G to 164G are parallel straight portion groups composed of the plurality of first A to first D intermediate straight portions 161 to 164, respectively.

[0457] The second A intermediate straight portions 171 of the plurality of turns 101 to 107 are arranged in the radial direction to form a second A intermediate straight portion group 171G. In addition, the second B intermediate straight portions 172 of the plurality of turns 101 to 107 are arranged in the radial direction to form a second B intermediate straight portion group 172G. In addition, the second C intermediate straight portions 173 of the plurality of turns 101 to 107 are arranged in the radial direction to form a second C intermediate straight portion group 173G. In addition, the second D intermediate straight portions 174 of the plurality of turns 101 to 107 are arranged in the radial direction to form a second D straight portion group 174G. The second intermediate straight portions 171, 171; 172, 172; 173, 173; 174, 174 adjacent in the radial direction are separated from each other in the radial direction. The second A to second D intermediate straight portion groups 171G to 174G are parallel straight portion groups composed of the plurality of second A to second D intermediate straight portions 171 to 174, respectively.

[0458] As mentioned above, Fig.34 as well as Fig.35The coil element 10i is in a dodecagonal shape as a whole. The coil element 10i (conductor 10E) is wound in such a way that each turn portion 101 to 107 is roughly in a dodecagonal shape. In other words, the coil element 10i includes 12 straight portion groups 11 to 14, 161 to 164, and 171 to 174 extending along the 12 sides of the dodecagon. In the example shown in the figure, when viewed in the axial direction, the angle formed by the first straight portion 11 and the first A intermediate straight portion 161 is 140° to 160°. In addition, when viewed in the axial direction, the angle formed by the first A intermediate straight portion 161 and the second A intermediate straight portion 171 is 140° to 160°. In addition, when viewed in the axial direction, the angle formed by the second A intermediate straight portion 171 and the second straight portion 12 is 140° to 160°. In addition, when viewed in the axial direction, the angle formed by the second straight portion 12 and the first B intermediate straight portion 162 is 140° to 160°. In addition, when viewed in the axial direction, the angle formed by the first B intermediate straight portion 162 and the second B intermediate straight portion 172 is 140° to 160°. In addition, when viewed in the axial direction, the angle formed by the second B intermediate straight portion 172 and the third straight portion 13 is 140° to 160°. In addition, when viewed in the axial direction, the angle formed by the third straight portion 13 and the first C intermediate straight portion 163 is 140° to 160°. In addition, when viewed in the axial direction, the angle formed by the first C intermediate straight portion 163 and the second C intermediate straight portion 173 is 140° to 160°. In addition, when viewed in the axial direction, the angle formed by the second C intermediate straight portion 173 and the fourth straight portion 14 is 140° to 160°. In addition, when viewed in the axial direction, the angle formed by the fourth straight portion 14 and the first D intermediate straight portion 164 is 140° to 160°. In addition, the angle between the first D intermediate straight portion 164 and the second D intermediate straight portion 174 is 140° to 160° when viewed in the axial direction. In addition, the angle between the second D intermediate straight portion 174 and the first straight portion 11 is 140° to 160° when viewed in the axial direction.

[0459] In particular, Fig.34 as well as Fig.35In the example shown, the angle between the first straight portion 11 and the first A intermediate straight portion 161 when viewed in the axial direction is 150°. In addition, the angle between the first A intermediate straight portion 161 and the second A intermediate straight portion 171 when viewed in the axial direction is 150°. In addition, the angle between the second A intermediate straight portion 171 and the second straight portion 12 when viewed in the axial direction is 150°. In addition, the angle between the second straight portion 12 and the first B intermediate straight portion 162 when viewed in the axial direction is 150°. In addition, the angle between the first B intermediate straight portion 162 and the second B intermediate straight portion 172 when viewed in the axial direction is 150°. In addition, the angle between the second B intermediate straight portion 172 and the third straight portion 13 when viewed in the axial direction is 150°. In addition, the angle between the third straight portion 13 and the first C intermediate straight portion 163 when viewed in the axial direction is 150°. In addition, the angle between the first C intermediate straight portion 163 and the second C intermediate straight portion 173 when viewed in the axial direction is 150°. In addition, when viewed in the axial direction, the angle between the second C intermediate straight portion 173 and the fourth straight portion 14 is 150°. In addition, when viewed in the axial direction, the angle between the fourth straight portion 14 and the first D intermediate straight portion 164 is 150°. In addition, when viewed in the axial direction, the angle between the first D intermediate straight portion 164 and the second D intermediate straight portion 174 is 150°. In addition, when viewed in the axial direction, the angle between the second D intermediate straight portion 174 and the first straight portion 11 is 150°.

[0460] And, in Fig.34 as well as Fig.35 In the example shown, the coil element 10i may also be in the shape of a regular dodecagon as a whole. The coil element 10i (conductor 10E) may also be wound in such a way that each turn portion 101 to 107 is substantially a regular dodecagon. In other words, the coil element 10i may also include 12 straight line portion groups 11 to 14, 161 to 164, 171 to 174 extending along the 12 sides of the regular dodecagon. In this case, the performance of the coil 10 can be improved.

[0461] Here, if Fig.30 As shown in FIG. 1 and FIG. 2 , when the coil 10 includes coil elements 10j and 10jj and the coil elements 10j and 10jj are in a dodecagonal shape as a whole, each coil element 10j and 10jj only needs to include 11 straight line portion groups 11 to 13, 161 to 164, and 171 to 174 extending along 11 of the 12 sides of the dodecagon. Similarly, when the coil 10 includes coil elements 10j and 10jj and the coil elements 10j and 10jj are in a regular dodecagonal shape as a whole, each coil element 10j and 10jj only needs to include 11 straight line portion groups 11 to 13, 161 to 164, and 171 to 174 extending along 11 of the 12 sides of the regular dodecagon.

[0462] exist Fig.34 as well as Fig.35 In the example shown, the linear portions 11 to 14 , the first intermediate linear portions 161 to 164 , and the second intermediate linear portions 171 to 184 that are adjacent in the circumferential direction may be connected by a curved portion.

[0463] exist Fig.34 In the example shown, the first shielding member 30 includes 18 shielding pieces 30P. Each shielding piece 30P has a quadrilateral shape. 24 gaps 50 are formed in the first shielding member 30. When viewed in the axial direction, 20 of the 24 gaps cross at least a portion of the straight line group 11G to 14G, the first intermediate straight line group 161G to 164G, and / or the second intermediate straight line group 171G to 174G.

[0464] exist Fig.35 In the example shown, the first shielding member 30 includes 24 shielding pieces 30P. 28 gaps 50 are formed in the first shielding member 30. 16 of the 28 gaps extend radially from the central axis C. 4 of the 16 gaps cross at least a portion of the second intermediate straight portion group 171G to 174G when viewed in the axial direction. Fig.35 In the example shown, the four gaps 50 cross the second intermediate straight portion groups 171G to 174G when viewed in the axial direction. In other words, the four gaps 50 extend from the radially inner side to the radially outer side of the second intermediate straight portion groups 171G to 174G when viewed in the axial direction.

[0465] By disposing the shielding small piece 30P in such a manner that one of the above-mentioned four gaps 50 crosses the second A intermediate straight line portion 171, it is possible to suppress the magnetic force lines formed around each second A intermediate straight line portion 171 from reaching the second shielding member 40 through the gap 50. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the second A intermediate straight line portion 171. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the above-mentioned gap 50, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the above-mentioned gap 50.

[0466] When viewed along the axial direction, the angle between the gap 50 that crosses the second A intermediate straight portion 171 and the second A intermediate straight portion 171 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 caused by the presence of the gap 50 can be effectively suppressed, and the reduction in performance of the coil unit 5 caused by the presence of the gap 50 can be effectively suppressed. Fig.35It can be understood that, when viewed in the axial direction, the gap 50 may be orthogonal to the second A intermediate straight line portion 171. In this case, the increase in the loss (heat generation) of the coil unit 5 due to the presence of the gap 50 can be more effectively suppressed, and the reduction in the performance of the coil unit 5 due to the presence of the gap 50 can be more effectively suppressed.

[0467] Furthermore, by disposing the shielding small piece 30P in such a manner that one of the above-mentioned four gaps 50 crosses the second B intermediate straight line portion 172, it is possible to suppress the magnetic force lines formed around each second B intermediate straight line portion 172 from reaching the second shielding member 40 through the gap 50. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the second B intermediate straight line portion 172. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the above-mentioned gap 50, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the above-mentioned gap 50.

[0468] When viewed along the axial direction, the angle between the gap 50 that crosses the second B intermediate straight portion 172 and the second B intermediate straight portion 172 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 caused by the presence of the gap 50 can be effectively suppressed, and the reduction in performance of the coil unit 5 caused by the presence of the gap 50 can be effectively suppressed. Fig.35 It can be understood that, when viewed in the axial direction, the gap 50 may be orthogonal to the second B intermediate straight line portion 172. In this case, the increase in the loss (heat generation) of the coil unit 5 due to the presence of the gap 50 can be more effectively suppressed, and the reduction in the performance of the coil unit 5 due to the presence of the gap 50 can be more effectively suppressed.

[0469] Furthermore, by disposing the shielding small piece 30P in such a manner that one of the above-mentioned four gaps 50 crosses the second C intermediate straight line portion 173, it is possible to suppress the magnetic force lines formed around each second C intermediate straight line portion 173 from reaching the second shielding member 40 through the gap 50. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the second C intermediate straight line portion 173. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the above-mentioned gap 50, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the above-mentioned gap 50.

[0470] When viewed along the axial direction, the angle between the gap 50 that crosses the second C middle straight portion 173 and the second C middle straight portion 173 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 caused by the presence of the gap 50 can be effectively suppressed, and the reduction in performance of the coil unit 5 caused by the presence of the gap 50 can be effectively suppressed. Fig.35 It can be understood that, when viewed in the axial direction, the gap 50 may be orthogonal to the second C intermediate straight line portion 173. In this case, the increase in loss (heat generation) of the coil unit 5 due to the presence of the gap 50 can be more effectively suppressed, and the reduction in performance of the coil unit 5 due to the presence of the gap 50 can be more effectively suppressed.

[0471] Furthermore, by disposing the shielding small piece 30P in such a manner that one of the above-mentioned four gaps 50 crosses the second D intermediate straight line portion 174, it is possible to suppress the magnetic force lines formed around each second D intermediate straight line portion 174 from reaching the second shielding member 40 through the gap 50. Thus, it is possible to suppress the generation of eddy currents in the second shielding member 40 due to the magnetic force lines formed around the second D intermediate straight line portion 174. This means that it is possible to suppress the increase in the loss (heat generation) of the coil unit 5 due to the presence of the above-mentioned gap 50, which means that it is possible to suppress the reduction in the performance of the coil unit 5 due to the presence of the above-mentioned gap 50.

[0472] When viewed along the axial direction, the angle between the gap 50 that crosses the second D intermediate straight portion 174 and the second D intermediate straight portion 174 can be, for example, 80° to 100°. In this case, the increase in loss (heat generation) of the coil unit 5 caused by the presence of the gap 50 can be effectively suppressed, and the reduction in performance of the coil unit 5 caused by the presence of the gap 50 can be effectively suppressed. Fig.35 It can be understood that, when viewed in the axial direction, the gap 50 may be orthogonal to the second D intermediate straight line portion 174. In this case, the increase in the loss (heat generation) of the coil unit 5 due to the presence of the gap 50 can be more effectively suppressed, and the reduction in the performance of the coil unit 5 due to the presence of the gap 50 can be more effectively suppressed.

[0473] exist Fig.35 In the example shown, 8 of the 16 gaps 50 cross at least a portion of any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. In the example shown, the 8 gaps 50 cross any one of the first to fourth straight portion groups 11G to 14G. In other words, when viewed in the axial direction, the 8 gaps 50 extend from a position radially inside of any one of the first to fourth straight portion groups 11G to 14G to a position radially outside.

[0474] When viewed in the axial direction, the gap 50 crossing the first straight portion 11 forms an angle of 80° to 100° with the first straight portion 11. More specifically, the gap 50 is orthogonal to the first straight portion 11. In addition, when viewed in the axial direction, the gap 50 crossing the second straight portion 12 forms an angle of 80° to 100° with the second straight portion 12. More specifically, the gap 50 is orthogonal to the second straight portion 12. In addition, when viewed in the axial direction, the gap 50 crossing the third straight portion 13 forms an angle of 80° to 100° with the third straight portion 13. More specifically, the gap 50 is orthogonal to the third straight portion 13. In addition, when viewed in the axial direction, the gap 50 crossing the fourth straight portion 14 forms an angle of 80° to 100° with the fourth straight portion 14. More specifically, the gap 50 is orthogonal to the fourth straight portion 14.

[0475] And, in Fig.35 In the example shown, when viewed in the axial direction, four of the 16 gaps 50 cross at least a portion of any one of the first A to first D intermediate straight portion groups 161G to 164G. In the example shown, the four gaps 50 cross any one of the first A to first D intermediate straight portion groups 161G to 164G. In other words, when viewed in the axial direction, the four gaps 50 extend from a position radially inward of any one of the first A to first D intermediate straight portion groups 161G to 164G to a radially outward position.

[0476] When viewed in the axial direction, the angle between the gap 50 crossing the first A intermediate straight portion 161 and the first A intermediate straight portion 161 is 80° to 100°. More specifically, the gap 50 is orthogonal to the first A intermediate straight portion 161. In addition, when viewed in the axial direction, the angle between the gap 50 crossing the first B intermediate straight portion 162 and the first B intermediate straight portion 162 is 80° to 100°. More specifically, the gap 50 is orthogonal to the first B intermediate straight portion 162. In addition, when viewed in the axial direction, the angle between the gap 50 crossing the first C intermediate straight portion 163 and the first C intermediate straight portion 163 is 80° to 100°. More specifically, the gap 50 is orthogonal to the first C intermediate straight portion 163. In addition, when viewed in the axial direction, the angle between the gap 50 crossing the first D intermediate straight portion 164 and the first D intermediate straight portion 164 is 80° to 100°. More specifically, the gap 50 is perpendicular to the first D intermediate straight line portion 164 .

[0477] The layout of the plurality of shielding small pieces 30P (or the division method of the first shielding member 30) in which the gaps 50 crossing the second intermediate straight line group 171G to 174G and the second intermediate straight line portions 171 to 174 form an angle of 80° to 100° is not limited to Fig.35In the case where the coil elements 10i, 10j, 10jj are in a dodecagonal shape as a whole, various layouts (or various division methods) may be adopted as the layout of a plurality of shielding pieces 30P (or the division methods of the first shielding member 30) in which the angles formed between the gaps 50 crossing the second intermediate straight line group 171G to 174G and the second intermediate straight line portions 171 to 174 are 80° to 100°.

[0478] Next, Fig.36 as well as Fig.37 The modified example shown is explained below. Fig. 6A In the example shown, when the first connection terminal 46 is connected to the inner end 10e1 of the coil element 10i, the first connection terminal 46 extends in the gap 50 when viewed in the axial direction, but the present invention is not limited thereto. Fig.34 as well as Fig.35 As shown in FIG. 1 , the first connection terminal 46 may also extend in the notch N formed in the shielding small piece 30P when viewed in the axial direction. In this case, as shown in FIG. Figure 7 As shown, the first connection terminal 46 may extend from the inside to the outside of the coil 10 at a height position overlapping with the small shield piece 30P when the coil unit 5 is viewed from the side.

[0479] When the first connection terminal 46 extends in the notch N formed in the shielding small piece 30P, the angle between the straight portion 11 through which the first connection terminal 46 crosses and the first connection terminal 46 may be, for example, 80° to 100° when viewed in the axial direction. Fig.36 as well as Fig.37 As shown, the first connection terminal 46 may be orthogonal to the straight portion 11. In this case, it is possible to prevent the magnetic field lines formed around the straight portion 11 from passing through the notch N and reaching the second shield member 40.

[0480] Next, Fig.38 as well as Fig.39 The modified example shown is explained below. Fig.38 In the example shown, Fig.24 Compared with the example shown in the figure, when viewed in the axial direction, the inner end region (at Fig.24 as well as Fig.38 In the example shown, the overlapping length of the shielding small piece 31 closest to the inner end 10e1 among the shielding small pieces 30P overlapping the first straight line portion 11 of the first turn portion 101 is longer than that of the inner end region. Fig.38 The loss (heat generation) of the first shielding member 30 (particularly, the loss of the shielding small piece 31) is greater than Fig.24The loss (heat generation) of the first shield member 30 (particularly, the loss of the shielding small piece 31) is more effectively reduced. It should be noted that the loss of the first shield member 30 here includes the loss caused by the magnetic flux of the first shield member 30 (so-called "iron loss").

[0481] In addition, Fig.39 In the example shown, Fig.29 Compared with the example shown in the figure, when viewed in the axial direction, the inner end region (at Fig.29 as well as Fig.39 In the example shown, the overlapping length of the shielding small piece 3130P closest to the inner end 10e1 among the shielding small pieces 3130P overlapping the first straight line portion 11) of the first turn portion 101 and the inner end region is longer. In this case, it is possible to Fig.39 The loss (heat generation) of the first shielding member 30 (particularly, the loss of the shielding small piece 31) is greater than Fig.29 The loss (heat generation) of the first shielding member 30 (particularly, the loss of the above-mentioned shielding small piece 31) is more effectively reduced.

[0482] Next, Fig.40 as well as Fig.41 The modified example shown is explained below. Figures 2 to 5B In the example shown, the first connection terminal 46 connected to the inner end 10e1 of the coil element 10i extends radially outward from the coil 10 across one of the first to fourth linear portion groups 11G to 14G when viewed in the axial direction, but the present invention is not limited thereto. Fig.40 As shown, the first connection terminal 46 can also extend radially outward from the coil 10 by crossing one of the first A to first D intermediate curve portion groups 151G to 154G when viewed in the axial direction. In this case, it is easy to make the first connection terminal 46 close to the second connection terminal 47. In other words, it is easy to make the distance between the first point IP1 and the second point IP2 less than 100 mm or less than 50 mm. Therefore, it is easy to make the angle θ between the first imaginary line IL1 and the second imaginary line IL2 less than 90°, less than 60°, less than 45°, or less than 30°.

[0483] exist Fig.40 In the example shown, when viewed in the axial direction, the angle formed by the first connection terminal 46 and the tangent line TL4 of the first intermediate curve portion group 154G through which the first connection terminal 46 crosses may be, for example, 80° to 100°. Fig.40It is understood that the first connection terminal 46 may be orthogonal to the tangent TL4 of the first intermediate curve portion group 154G when viewed in the axial direction. In this case, it is possible to prevent the magnetic field lines formed around the turns 101 to 108 of the coil 10 from reaching the second shielding member 40 through the gap 50 or the notch N through which the first connection terminal 46 passes.

[0484] Or, if Fig.41 As shown, the first connection terminal 46 may also extend radially outward of the coil 10 by crossing one of the intermediate straight portion groups 161G to 164G or 171G to 174G when viewed in the axial direction. In this case, it is easy to make the first connection terminal 46 close to the second connection terminal 47. In other words, it is easy to make the distance between the first point IP1 and the second point IP2 less than 100 mm or less than 50 mm. Therefore, it is easy to make the angle θ between the first imaginary line IL1 and the second imaginary line IL2 less than 90°, less than 60°, less than 45°, or less than 30°.

[0485] exist Fig.41 In the example shown, when viewed in the axial direction, the angle between the first connection terminal 46 and the intermediate straight portion group 164G through which the first connection terminal 46 crosses may be, for example, 80° to 100°. Fig.41 It is understood that the first connection terminal 46 may be orthogonal to the intermediate straight portion group 164G when viewed in the axial direction. In this case, it is possible to prevent the magnetic flux formed around the turns 101 to 108 of the coil 10 from reaching the second shielding member 40 through the gap 50 or the notch N through which the first connection terminal 46 passes.

[0486] Next, Fig.42 The modified example shown is explained below. Figures 2 to 5B In the example shown, the pitches of the plurality of turns 101 to 108 are equal. Therefore, the distance between the inner end 10e1 of the coil element 10i and the first straight portion 11 of the second turn 102 is equal to the distance between the first straight portion 11 of the second turn 102 and the first straight portion 11 of the third turn 103. Fig.42 In the example shown, the distance between the inner end 10e1 of the coil element 10i and the first straight portion 11 of the second turn portion 102 is greater than the distance between the first straight portion 11 of the second turn portion 102 and the first straight portion 11 of the third turn portion 103. More specifically, the inner end region (in the region between the inner end 10e1 and the first straight portion 11 of the third turn portion 103) of the coil element 10i includes the inner end 10e1. Fig.42In the example shown, the distance between the first straight portion 11 of the first turn 101 and the first straight portion 11 of the second turn 102 is greater than the distance between the first straight portion 11 of the second turn 102 and the first straight portion 11 of the third turn 103. In the example where the first connecting terminal 46 is connected to the inner end portion 10e1 of the coil element 10i, by separating the inner end portion 10e1 from the second turn 102, the loss (heat generation) of the first shielding component 30 (including the so-called iron loss) can be suppressed. In particular, when viewed in the axial direction, the above-mentioned inner end region (at the inner end of the coil element 10i) can be effectively suppressed. Fig.42 In the example shown, the shielding small piece 30P (in Fig.42 In the example shown, the loss (heat generation) of the shielding small piece 31 is shown.

[0487] <<Second Embodiment>>

[0488] Next, refer to Fig.43 , the second embodiment and its modified examples are described. Fig.43 The coil unit 5 shown is Fig.26 Compared with the coil unit 5 shown in FIG. 1 , the difference is that the first shielding component 30 is not divided into a plurality of shielding pieces 30P. Fig.26 The coil units 5 shown are substantially the same. Fig.43 In the second embodiment shown, Fig.26 The same parts of the coil unit 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0489] exist Fig.43 In the example shown, Fig.26 In the example shown, the coil element 10i is an octagon as a whole. More specifically, the coil element 10i includes eight straight line groups (straight line groups 11G to 14G and intermediate straight line groups 161G to 164G) extending along the eight sides of the octagon. Figures 2 to 5B That is, the performance of the coil unit 5 including the overall octagonal coil element 10i is higher than that of the coil unit 5 including the overall quadrilateral coil element 10i including the first intermediate curved portion group 151G to 154G.

[0490] exist Fig.43 In the example shown, the angle formed by the adjacent straight line sections 11G, 161G; 161G, 12G; 12G, 162G; 162G, 13G; 13G, 163G; 163G, 14G; 14G, 164G; 164G, 11G may be 125° to 145°. Fig.43In the example shown, the angle formed by the adjacent straight line sections 11G, 161G; 161G, 12G; 12G, 162G; 162G, 13G; 13G, 163G; 163G, 14G; 14G, 164G; 164G, 11G may be 135°. Fig.43 In the example shown, the coil element 10i may be a regular octagon as a whole. According to the findings obtained by the inventors of the present application, the performance of the coil unit 5 can be effectively improved by making the coil 10 a regular octagon.

[0491] It should be noted that in Fig.43 In the example shown, the first shielding member 30 is not divided into a plurality of shielding pieces 30P. Therefore, no gap 50 is formed in the first shielding member 30. Of course, in the case where the coil element 10i is octagonal as a whole, as shown in FIG. Figure 26 to Figure 29 As shown in FIG. 1 , the first shielding member 30 may also be divided into a plurality of shielding small pieces 30P. When the first shielding member 30 is divided into a plurality of shielding small pieces 30P, if conditions other than the shape of the coil element 10i are the same, the performance of the coil unit 5 including the coil element 10i having an overall octagonal shape is also better than that including the coil element 10i having an overall octagonal shape. Figures 2 to 5B The coil element 10i of the shape shown has high performance of the coil unit 5. For example, Fig.28 The performance of the coil unit 5 shown is better than Fig. 22 The performance of the coil unit 5 shown is high. Fig.29 The performance of the coil unit 5 shown is better than Fig.24 The coil unit 5 shown has high performance.

[0492] <<Modifications>>

[0493] It should be noted that various changes may be made to the second embodiment described above. Fig.44 as well as Fig.45 , a modified example of the second embodiment is described.

[0494] exist Fig.44 In the example shown, Figure 30 to Figure 33 Similarly to the example shown, the coil elements 10j and 10jj are octagonal in shape as a whole. More specifically, the coil elements 10j and 10jj include 7 straight line groups (straight line groups 11G to 13G and intermediate straight line groups 161G to 164G) extending along 7 of the 8 sides of the octagon. Figures 17 to 21That is, the performance of the coil unit 5 including the coil elements 10j and 10jj which are octagonal as a whole is higher than the performance of the coil unit 5 including the coil elements 10j and 10jj which are quadrilateral as a whole and include the first intermediate curved portions 151G to 154G.

[0495] exist Fig.44 In the example shown, the angle formed by the adjacent straight line sections 11G, 161G; 161G, 12G; 12G, 162G; 162G, 13G; 13G, 163G; 164G, 11G may be 125° to 145°. Fig.44 In the example shown, the angle formed by the adjacent straight line sections 11G, 161G; 161G, 12G; 12G, 162G; 162G, 13G; 13G, 163G; 164G, 11G may be 135°. Fig.44 In the example shown, the coil elements 10j and 10jj may also be a regular octagon as a whole. More specifically, the coil elements 10j and 10jj may also include 7 straight line groups (straight line groups 11G to 13G and first intermediate straight line groups 161G to 164G) extending along 7 of the 8 sides of the regular octagon. According to the findings obtained by the inventors of the present application, by making the coil 10 a regular octagon, the performance of the coil unit 5 can be effectively improved.

[0496] It should be noted that in Fig.44 In the example shown, the first shielding member 30 is not divided into a plurality of shielding pieces 30P. Therefore, no gap 50 is formed in the first shielding member 30. Of course, in the case where the coil elements 10j and 10jj are octagonal in shape as a whole, Figure 30 to Figure 33 As shown in FIG. 1 , the first shielding member 30 may also be divided into a plurality of shielding small pieces 30P. When the first shielding member 30 is divided into a plurality of shielding small pieces 30P, if conditions other than the shapes of the coil elements 10j and 10jj are the same, the performance of the coil unit 5 including the coil elements 10j and 10jj that are octagonal as a whole is better than that including the coil element 10j and 10jj. Figures 17 to 19 The coil elements 10j and 10jj of the shapes shown have high performance of the coil unit 5. For example, Fig.31 The performance of the coil unit 5 shown is better than Fig.21 The coil unit 5 shown has high performance.

[0497] exist Fig.45 In the example shown, Fig.34 as well as Fig.35In the example shown, the coil element 10i is a dodecagon as a whole. More specifically, the coil element 10i includes 11 straight line groups (straight line groups 11G to 13G, first intermediate straight line groups 161G to 164G, and second intermediate straight line groups 171G to 174G) extending along 11 of the 12 sides of the dodecagon. Fig.45 In the example shown, the coil element 10i includes a straight line group (straight line group 11G to 14G, first intermediate straight line group 161G to 164G, and second intermediate straight line group 171G to 174G) extending along the 12 sides of the dodecagon. Figures 2 to 5B That is, the performance of the coil unit 5 including the coil element 10i having an overall dodecagonal shape is higher than that of the coil unit 5 including the coil element 10i having an overall quadrilateral shape and including the first intermediate curved portions 151G to 154G.

[0498] exist Fig.45 In the example shown, the angle formed by the adjacent straight line groups 11G, 161G; 161G, 171G; 171G, 12G; 12G, 162G; 162G, 172G; 172G, 13G; 13G, 163G; 163G, 173G; 164G, 174G; 174G, 11G may be 125° to 145°. Fig.45 In the example shown, the angle formed by the adjacent straight line sections 173G, 14G; 14G, 164G may also be 125° to 145°. Fig.45 In the example shown, the angle formed by the adjacent straight line sections 11G, 161G; 161G, 171G; 171G, 12G; 12G, 162G; 162G, 172G; 172G, 13G; 13G, 163G; 163G, 173G; 164G, 174G; 174G, 11G may be 135°. Fig.45 In the example shown, the angle formed by the adjacent straight line sections 173G, 14G; 14G, 164G may also be 135°. Fig.45 In the example shown, the coil element 10i may also be a regular dodecagon as a whole. More specifically, the coil element 10i may include 11 straight line groups (straight line groups 11G to 13G, first intermediate straight line groups 161G to 164G, and second intermediate straight line groups 171G to 174G) extending along 11 of the 12 sides of the regular dodecagon. According to the insights obtained by the inventors of the present application, by making the coil 10 a regular dodecagon, the performance of the coil unit 5 can be effectively improved.

[0499] It should be noted that in Fig.45In the example shown, the first shielding member 30 is not divided into a plurality of shielding pieces 30P. Therefore, no gap 50 is formed in the first shielding member 30. Of course, in the case where the coil element 10i is a dodecagonal shape as a whole, such as Fig.34 as well as Fig.35 As shown in FIG. 1 , the first shielding member 30 may also be divided into a plurality of shielding small pieces 30P. When the first shielding member 30 is divided into a plurality of shielding small pieces 30P, if conditions other than the shape of the coil element 10i are the same, the performance of the coil unit 5 including the coil element 10i having a dodecagonal shape as a whole is also better than that including the coil element 10i having a dodecagonal shape as a whole. Figures 2 to 5B The coil unit 5 of the coil component 10i having the shape shown has high performance.

[0500] In addition, Fig.45 In the example shown, the coil element 10i includes 12 straight line groups (straight line groups 11G to 14G, first intermediate straight line groups 161G to 164G, and second intermediate straight line groups 171G to 174G) extending along the 12 sides of the dodecagon. Fig.30 As shown in FIG. 1 and FIG. 2 , when the coil 10 includes coil elements 10j and 10jj and the coil elements 10j and 10jj are in a dodecagonal shape as a whole, each coil element 10j and 10jj only needs to include 11 straight line portion groups 11 to 13, 161 to 164, and 171 to 174 extending along 11 of the 12 sides of the dodecagon. Similarly, when the coil 10 includes coil elements 10j and 10jj and the coil elements 10j and 10jj are in a regular dodecagonal shape as a whole, each coil element 10j and 10jj only needs to include 11 straight line portion groups 11 to 13, 161 to 164, and 171 to 174 extending along 11 of the 12 sides of the regular dodecagon.

[0501] <<Example 1>>

[0502] Next, a description will be given of a difference in loss of the coil unit 5 caused by a difference in position of the gap 50 formed in the first shield member 30 .

[0503] <Example 1-1>

[0504] As the coil unit 5 of embodiment 1-1, Figures 2 to 5B As shown in FIG. 1 , a coil unit 5 including a coil 10 formed in a spiral shape, a magnetic resin layer 20 , a first shield member 30 , and a second shield member 40 is prepared.

[0505] Coil 10 and Figures 2 to 5BThe coil 10 shown is formed similarly. The coil 10 is formed of copper, has a line width of 6 mm, and a thickness of 0.5 mm. In addition, the distance between adjacent turns 101, 102; ...; 107, 108 is 6 mm. The dimensions of the coil 10 along the first direction D1 and the second direction D2 are 295 mm and 295 mm, respectively.

[0506] The magnetic resin layer 20 is formed by curing a two-component curable epoxy resin mixed with magnetic powder. Figure 4 As shown, the coil 10 is housed in the recess 25 of the magnetic resin layer 20 , and the second main surface 10 b of the coil 10 is in close contact with the magnetic resin layer 20 .

[0507] The first shielding member 30 is formed by dividing into four shielding pieces 31 to 34. Each shielding piece 31 to 34 is a ferrite plate. The dimensions of the first shielding member 30 in the first direction D1 and the second direction D2 are 300 mm and 300 mm, respectively. In addition, the distance between the magnetic resin layer 20 and the first shielding member 30 is 1 mm.

[0508] The width of the gap 50 between the adjacent shielding small pieces 31, 32; 32, 33; 33, 34; 34, 31 is 5 mm. One of the four gaps 50 (the first gap 51) formed between the adjacent shielding small pieces 31, 32; 32, 33; 33, 34; 34, 31 crosses the first straight line portion 11 of the second to eighth turns 102 to 108 when viewed in the axial direction. This gap 50 is orthogonal to the first straight line portion 11 of the second to eighth turns 102 to 108 when viewed in the axial direction. The other three gaps 50 (the second to fourth gaps 52 to 54) cross the second to fourth straight line portions 12 to 14 of the first to eighth turns 101 to 108 when viewed in the axial direction, respectively. These three gaps 50 are orthogonal to the second to fourth straight line portions 12 to 14 of the first to eighth turns 101 to 108 when viewed in the axial direction, respectively. The four gaps 50 (the first to fourth gaps 51 to 54) are formed so that their extended lines pass through the central axis C.

[0509] The second shielding member 40 is formed of aluminum. The dimensions of the second shielding member 40 in the first direction D1 and the second direction D2 are 320 mm and 320 mm, respectively. In addition, the distance between the first shielding member 30 and the second shielding member 40 is 1 mm.

[0510] (evaluate)

[0511] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Example 1-1 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0512] The Q value and loss of the coil unit 5 of Example 1-1 were 121.0 and 87.7 W, respectively.

[0513] <Example 1-2>

[0514] In addition to Fig. 9 In the illustrated example, the coil unit 5 of Example 1-2 is manufactured in the same manner as in Example 1-1, except that the first shield member 30 is divided into six shield small pieces 31 to 36 .

[0515] Each of the shielding small pieces 31 to 36 is a ferrite plate.

[0516] The width of the gap 50 between adjacent shielding patches 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 is 5 mm.

[0517] Two of the seven gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 cross the first straight line portions 11 of the second to eighth turns 102 to 108 or the third straight line portions 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. These two gaps 50 are orthogonal to the first straight line portions 11 of the second to eighth turns 102 to 108 or the third straight line portions 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. In addition, these two gaps 50 are formed so that their extended lines pass through the central axis C.

[0518] Furthermore, one of the seven gaps 50 extends along the second direction D2 in a region surrounded by the first turn portion 101. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0519] In addition, the remaining four gaps 50 cross the second straight portions 12 or the fourth straight portions 14 of the first to eighth turns 101 to 108 when viewed in the axial direction. These four gaps 50 are orthogonal to the second straight portions 12 or the fourth straight portions 14 of the first to eighth turns 101 to 108 when viewed in the axial direction. In addition, two of these four gaps 50 extend between the first straight portion group 11G and the central axis C when viewed in the axial direction. In addition, the other two of these four gaps 50 extend between the third straight portion group 13G and the central axis C when viewed in the axial direction.

[0520] (evaluate)

[0521] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Example 1-2 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0522] The Q value and loss of the coil unit 5 of Example 1-2 are 115.0 and 91.3 W, respectively.

[0523] <Examples 1-3>

[0524] like Fig.12 As shown in FIG. 1 , the coil unit 5 of Example 1-3 is manufactured in the same manner as in Example 1-1, except that the first shield member 30 is divided into six shield small pieces 31 to 36 .

[0525] Each of the shielding small pieces 31 to 36 is a ferrite plate.

[0526] The width of the gap 50 between adjacent shielding patches 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 is 5 mm.

[0527] Two of the seven gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 cross the first straight line portions 11 of the second to eighth turns 102 to 108 or the third straight line portions 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. These two gaps 50 are orthogonal to the first straight line portions 11 of the second to eighth turns 102 to 108 or the third straight line portions 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. In addition, these two gaps 50 are formed so that their extended lines pass through the central axis C.

[0528] Furthermore, one of the seven gaps 50 extends along the second direction D2 in a region surrounded by the first turn portion 101. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0529] In addition, three of the remaining four gaps 50 extend along the second direction D2 when viewed axially, overlapping the first straight portion 11 or the third straight portion 13 of the first turn portion 101. In addition, another one of the four gaps 50 extends on the extension line of the first straight portion 11 when viewed axially.

[0530] (evaluate)

[0531] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Example 1-3 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0532] The Q value and loss of the coil unit 5 of the coil 10 of Example 1-3 are 102.0 and 99.5 W, respectively.

[0533] <Examples 1-4>

[0534] like Fig.13 As shown in FIG. 1 , the coil unit 5 of Example 1-4 is manufactured in the same manner as in Example 1-1, except that the first shield member 30 is divided into six shield small pieces 31 to 36 .

[0535] Each of the shielding small pieces 31 to 36 is a ferrite plate.

[0536] The width of the gap 50 between adjacent shielding patches 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 is 5 mm.

[0537] Three of the seven gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 cross a portion of the first straight portion 11 of the second to eighth turns 102 to 108 and / or a portion of the third straight portion 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. These three gaps 50 are orthogonal to a portion of the first straight portion 11 of the second to eighth turns 102 to 108 and / or a portion of the third straight portion 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. In addition, one of the three gaps 50 overlaps with the central axis C when viewed in the axial direction. In addition, the other two of the three gaps 50 are formed so that their extended lines pass through the central axis C.

[0538] In addition, two of the remaining four gaps 50 extend along the first straight portion 11 in the first straight portion group 11G as viewed in the axial direction. More specifically, these gaps 50 extend between the first straight portion 11 of the second turn portion 102 and the third turn portion 103. In addition, another two of the four gaps 50 extend along the third straight portion 13 in the third straight portion group 13G as viewed in the axial direction. More specifically, these gaps 50 extend between the third straight portion 13 of the second turn portion 102 and the third turn portion 103.

[0539] (evaluate)

[0540] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Example 1-4 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0541] The Q value and loss of the coil unit 5 of Example 1-4 are 94.5 and 104.0 W, respectively.

[0542] <Examples 1-5>

[0543] like Fig.14 As shown in FIG. 1 , the coil unit 5 of Example 1-5 is manufactured in the same manner as in Example 1-1, except that the first shield member 30 is divided into six shield small pieces 31 to 36 .

[0544] Each of the shielding small pieces 31 to 36 is a ferrite plate.

[0545] The width of the gap 50 between adjacent shielding patches 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 is 5 mm.

[0546] Three of the seven gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 cross a portion of the first straight portion 11 of the second to eighth turns 102 to 108 and / or a portion of the third straight portion 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. These three gaps 50 are orthogonal to a portion of the first straight portion 11 of the second to eighth turns 102 to 108 and / or a portion of the third straight portion 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. In addition, one of the three gaps 50 overlaps with the central axis C when viewed in the axial direction. In addition, the other two of the three gaps 50 are formed so that their extended lines pass through the central axis C.

[0547] In addition, two of the remaining four gaps 50 extend along the first straight portion 11 in the first straight portion group 11G as viewed in the axial direction. More specifically, these gaps 50 extend between the first straight portion 11 of the third turn portion 103 and the fourth turn portion 104. In addition, another two of the four gaps 50 extend along the third straight portion 13 in the third straight portion group 13G as viewed in the axial direction. More specifically, these gaps 50 extend between the third straight portion 13 of the third turn portion 103 and the fourth turn portion 104.

[0548] (evaluate)

[0549] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Example 1-5 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0550] The Q value and loss of the coil unit 5 of Example 1-5 are 89.7 and 103.0 W, respectively.

[0551] <Examples 1-6>

[0552] like Fig.15 As shown in FIG. 1 , the coil unit 5 of Example 1-6 is manufactured in the same manner as in Example 1-1, except that the first shield member 30 is divided into six shield small pieces 31 to 36 .

[0553] Each of the shielding small pieces 31 to 36 is a ferrite plate.

[0554] The width of the gap 50 between adjacent shielding patches 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 is 5 mm.

[0555] Three of the seven gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 cross a portion of the first straight portion 11 of the second to eighth turns 102 to 108 and / or a portion of the third straight portion 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. These three gaps 50 are orthogonal to a portion of the first straight portion 11 of the second to eighth turns 102 to 108 and / or a portion of the third straight portion 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. In addition, one of the three gaps 50 overlaps with the central axis C when viewed in the axial direction. In addition, the other two of the three gaps 50 are formed so that their extended lines pass through the central axis C.

[0556] In addition, two of the remaining four gaps 50 extend along the first straight portion 11 in the first straight portion group 11G as viewed in the axial direction. More specifically, these gaps 50 extend between the first straight portion 11 of the sixth turn portion 106 and the seventh turn portion 107. In addition, another two of the four gaps 50 extend along the third straight portion 13 in the third straight portion group 13G as viewed in the axial direction. More specifically, these gaps 50 extend between the third straight portion 13 of the sixth turn portion 106 and the seventh turn portion 107.

[0557] (evaluate)

[0558] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Example 1-6 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0559] The Q value and loss of the coil unit 5 of Example 1-6 are 95.4 and 100.0 W, respectively.

[0560] <Examples 1-7>

[0561] like Fig.16 As shown in FIG. 1 , the coil unit 5 of Example 1-7 is manufactured in the same manner as in Example 1-1, except that the first shield member 30 is divided into six shield small pieces 31 to 36 .

[0562] Each of the shielding small pieces 31 to 36 is a ferrite plate.

[0563] The width of the gap 50 between adjacent shielding patches 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 is 5 mm.

[0564] Three of the seven gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 31; 32, 35 cross a portion of the first straight portion 11 of the second to eighth turns 102 to 108 and / or a portion of the third straight portion 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. These three gaps 50 are orthogonal to a portion of the first straight portion 11 of the second to eighth turns 102 to 108 and / or a portion of the third straight portion 13 of the first to eighth turns 101 to 108 when viewed in the axial direction. In addition, one of the three gaps 50 overlaps with the central axis C when viewed in the axial direction. In addition, the other two of the three gaps 50 are formed so that their extended lines pass through the central axis C.

[0565] In addition, two of the remaining four gaps 50 extend along the first straight portion 11 in the first straight portion group 11G when viewed in the axial direction. More specifically, these gaps 50 overlap with the first straight portion 11 of the eighth turn portion 108. In addition, another two of the four gaps 50 extend along the third straight portion 13 in the third straight portion group 13G when viewed in the axial direction. More specifically, these gaps 50 overlap with the third straight portion 13 of the eighth turn portion 108.

[0566] (evaluate)

[0567] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Example 1-7 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0568] The Q value and loss of the coil unit 5 of Example 1-7 are 120.5 and 88.0 W, respectively.

[0569] Fig.46 The Q value and loss of the coil unit 5 of Examples 1-1 to 1-7 are shown.

[0570] from Fig.46 It can be understood that the number of gaps 50 in the first shielding member 30 of the coil unit 5 of Example 1-2 is greater than the number of gaps 50 in the first shielding member 30 of the coil unit 5 of Example 1-1, but there is no significant difference in Q value and loss between the coil units 5 of Example 1-1 and Example 1-2. From this result, it can be understood that when the gaps 50 in the first shielding member 30 are set to cross the straight line group of the coil element 10i when viewed in the axial direction, the performance of the coil 10 is not significantly impaired due to the presence of the gaps 50, and the loss of the coil unit 5 is not significantly increased.

[0571] In addition, based on the results of Examples 1-1 to 1-7, it can be understood that there is a tendency that, when viewed in the axial direction, the Q value of the coil unit (the coil unit 5 of Examples 1-1 and 1-2) formed in a manner that all the gaps 50 of the first shielding member 30 cross any of the straight portion groups 11G to 14G is higher than the Q value of the coil unit (the coil unit 5 of Examples 1-3 to 1-7) formed in a manner that a portion of the gaps 50 of the first shielding member 30 extends in parallel with the straight portions 11 to 14 constituting the straight portion group 11G to 14G in any of the straight portion groups 11G to 14G.

[0572] It should be noted that, according to the results of Examples 1-3 to 1-7, it can be understood that when the gap 50 formed in the first shielding component 30 extends along the straight portions 11 to 14 constituting the straight portion group 11G to 14G in any straight portion group 11G to 14G as viewed axially, the closer the gap 50 is to the radial center of the straight portion group 11G to 14G, the lower the Q value of the coil unit 5.

[0573] In addition, based on the results of Examples 1-2 to 1-7, it can be understood that there is the following tendency: when viewed along the axial direction, the Q value of the coil unit (coil unit 5 of Example 1-2) formed in a manner that the gap 50 of the first shielding component 30 extends between the first turn portion 101 forming the innermost circumference of the coil 10 and the center axis C is higher than the Q value of the coil unit (coil unit 5 of Examples 1-3 to 1-7) formed in a manner that the gap 50 of the first shielding component 30 extends at a position further outward than the first turn portion 101 forming the innermost circumference of the coil 10.

[0574] In addition, based on the results of Examples 1-1 to 1-7, it can be understood that there is the following tendency: when viewed along the axial direction, the Q value of the coil unit (coil unit 5 of Example 1-1) formed in a manner that the extension line of the gap 50 of the first shielding component 30 overlaps with the center axis C is higher than the Q value of the coil unit (coil unit 5 of Examples 1-2 to 1-7) formed in a manner that the extension line of the gap 50 of the first shielding component 30 deviates from the center axis C.

[0575] <<Example 2>>

[0576] Next, a description will be given of a difference in loss of the coil unit 5 caused by a difference in distance between the second main surface 10 b of the coil 10 and the magnetic resin layer 20 .

[0577] <Example 2-1>

[0578] As the coil unit 5 of embodiment 2-1, Figures 17 to 19As shown in FIG. 1 , a coil unit 5 including a coil 10 including coil elements 10 j and 10 jj formed in a spiral shape, a magnetic resin layer 20 , a first shield member 30 , and a second shield member 40 is prepared.

[0579] Coil 10 and Figures 17 to 19 The coil 10 shown is formed in the same manner. The coil elements 10j, 10jj are formed of copper, and have a line width of 6 mm and a thickness of 0.5. In addition, in each coil element 10j, 10jj, the distance between adjacent turns 101, 102; ...; 104, 105 is 6 mm. The dimensions of the coil 10 along the first direction D1 and the second direction D2 are 295 mm and 295 mm, respectively.

[0580] The magnetic resin layer 20 is formed by curing a two-component curable epoxy resin mixed with magnetic powder. Fig.18 As shown, the coil 10 is embedded in the magnetic resin layer 20 , and the second main surface 10 b of the coil 10 is in close contact with the magnetic resin layer 20 .

[0581] The first shield member 30 is divided into nine shielding pieces 31 to 39. Each of the shielding pieces 31 to 39 is a ferrite plate. The dimensions of the first shield member 30 in the first direction D1 and the second direction D2 are 300 mm and 300 mm, respectively.

[0582] In addition, the distance between the magnetic resin layer 20 and the first shield member 30 is 0 mm. That is, the magnetic resin layer 20 and the first shield member 30 are in close contact with each other.

[0583] The width of the gap 50 between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 37; 37, 38; 38, 31; 32, 39; 34, 39; 36, 39; 38, 39 is 5 mm. Two of the 12 gaps 50 formed between the adjacent shielding pieces 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 37; 37, 38; 38, 31; 32, 39; 34, 39; 36, 39; 38, 39 cross the first straight line portions 11 of the first to fifth turns 101 to 105 as viewed in the axial direction. These two gaps are orthogonal to the first straight line portions 11 of the first to fifth turns 101 to 105 as viewed in the axial direction. In addition, two of the above-mentioned 12 gaps 50 cross the second straight portions 12 of the first to fifth turns 101 to 105 when viewed in the axial direction. These two gaps 50 are orthogonal to the second straight portions 12 of the first to fifth turns 101 to 105 when viewed in the axial direction. In addition, two of the above-mentioned 12 gaps 50 cross the third straight portions 13 of the first to fifth turns 101 to 105 when viewed in the axial direction. These two gaps 50 are orthogonal to the third straight portions 13 of the first to fifth turns 101 to 105 when viewed in the axial direction. In addition, two of the above-mentioned 12 gaps 50 cross the turn connecting portions 16 of the first to fourth turns 101 to 104 when viewed in the axial direction. In addition, four of the above-mentioned 12 gaps 50 extend along the first direction D1 or the second direction D2 radially inward of the first turn 101 located at the innermost side when viewed in the axial direction.

[0584] The second shielding member 40 is formed of aluminum. The dimensions of the second shielding member 40 in the first direction D1 and the second direction D2 are 320 mm and 320 mm, respectively. In addition, the distance between the first shielding member 30 and the second shielding member 40 is 1 mm.

[0585] (evaluate)

[0586] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Example 2-1 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0587] The Q value and loss of the coil unit 5 of Example 2-1 are 121.2 and 87.7 W, respectively.

[0588] <Example 2-2>

[0589] The coil unit 5 of Example 2-2 was produced in the same manner as in Example 2-1, except that the distance between the magnetic resin layer 20 and the first shield member 30 was set to 1 mm.

[0590] (evaluate)

[0591] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Example 2-2 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0592] The Q value and loss of the coil unit 5 of Example 2-2 are 122.0 and 85.0 W, respectively.

[0593] <Comparative Example 2-1>

[0594] The coil unit 5 of Comparative Example 2-1 was produced in the same manner as in Example 2-1 except that the magnetic resin layer 20 was disposed separately from the coil 10. The distance between the second main surface 10b of the coil 10 and the magnetic resin layer 20 was 0.1 mm.

[0595] (evaluate)

[0596] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Comparative Example 2-1 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0597] The Q value and loss of the coil unit 5 of Comparative Example 2-1 were 90.5 W and 116.3 W, respectively.

[0598] <Comparative Example 2-2>

[0599] The coil unit 5 of Comparative Example 2-2 was produced in the same manner as in Comparative Example 2-1, except that the distance between the second main surface 10 b of the coil 10 and the magnetic resin layer 20 was set to 1 mm.

[0600] (evaluate)

[0601] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Comparative Example 2-2 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0602] The Q value and loss of the coil unit 5 of Comparative Example 2-2 were 96.6 W and 106.4 W, respectively.

[0603] <Comparative Example 2-3>

[0604] The coil unit 5 of Comparative Example 2-3 was produced in the same manner as in Example 2-1 except that the magnetic resin layer 20 was not provided.

[0605] (evaluate)

[0606] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Comparative Example 2-3 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0607] The Q value and loss of the coil unit 5 of Comparative Example 2-3 were 97.0 W and 105.2 W, respectively.

[0608] <Comparative Example 2-4>

[0609] The coil unit 5 of Comparative Example 2-4 was produced in the same manner as in Comparative Example 2-3, except that the distance between the first shield member 30 and the second shield member 40 was set to 6 mm.

[0610] (evaluate)

[0611] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Comparative Example 2-4 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0612] The Q value and loss of the coil unit 5 of Comparative Example 2-4 were 104.0 W and 100.9 W, respectively.

[0613] <Comparative Example 2-5>

[0614] The coil unit 5 of Comparative Example 2-5 was produced in the same manner as in Comparative Example 2-3, except that the distance between the first shield member 30 and the second shield member 40 was set to 10 mm.

[0615] (evaluate)

[0616] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Comparative Example 2-5 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0617] The Q value and loss of the coil unit 5 of Comparative Example 2-5 were 106.0 and 99.6 W, respectively.

[0618] <Comparative Example 2-6>

[0619] The coil unit 5 of Comparative Example 2-6 was produced in the same manner as in Comparative Example 2-3, except that the distance between the first shield member 30 and the second shield member 40 was set to 15 mm.

[0620] (evaluate)

[0621] Next, a high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Comparative Example 2-6 manufactured in this manner, and the Q value and loss of the coil unit 5 were measured.

[0622] The Q value and loss of the coil unit 5 of Comparative Example 2-6 were 108.0 and 98.3 W, respectively.

[0623] Fig.47 The Q values ​​and losses of the coil units of Examples 2-1 to 2-2 and Comparative Examples 2-1 to 2-6 are shown.

[0624] from Fig.47It can be understood that the loss of the coil unit 5 of Example 2-1 is significantly reduced compared to the loss of the coil unit 5 of Comparative Examples 2-1 to 2-2. It can be seen that by making the second main surface 10b of the coil 10 close to the magnetic resin layer 20, the loss of the coil unit 5 can be greatly reduced. In other words, when the second main surface 10b of the coil 10 is separated from the magnetic resin layer 20, for example, even if the distance between the second main surface 10b and the magnetic resin layer 20 is as small as 0.1mm, the loss of the coil unit 5 will increase significantly. In addition, there is no big difference in the loss of the coil unit 5 between Example 2-1 and Example 2-2. It can be seen that when the second main surface 10b of the coil 10 is close to the magnetic resin layer 20, the increase in the loss of the coil unit 5 caused by bringing the first shielding component 30 close to the coil 10 can be suppressed. It should be noted that, by comparing the losses of the coil units 5 in Comparative Examples 2-3 to 2-6, it can be seen that the loss of the coil unit 5 increases by bringing the second shield member 40 closer to the first shield member 30 .

[0625] <<Example 3 to Example 6>>

[0626] Next, differences in the performance of the coil unit 5 due to differences in the shapes of the coils 10 will be described.

[0627] <Example 3-1>

[0628] As the coil unit 5 of embodiment 3-1, Figures 2 to 5B As shown in FIG. 1 , a coil unit 5 including a coil 10 formed in a spiral shape, a magnetic resin layer 20 , a first shield member 30 , and a second shield member 40 is prepared.

[0629] Coil 10 and Figures 2 to 5B The coil 10 shown is formed similarly. The coil 10 is formed of copper, has a line width of 6 mm, and a thickness of 0.5 mm. In addition, the distance between adjacent turns 101, 102; ...; 107, 108 is 6 mm. The dimensions of the coil 10 along the first direction D1 and the second direction D2 are 295 mm and 295 mm, respectively.

[0630] The magnetic resin layer 20 is formed by curing a two-component curable epoxy resin mixed with magnetic powder. Figure 4 As shown, the coil 10 is housed in the recess 25 of the magnetic resin layer 20 , and the second main surface 10 b of the coil 10 is in close contact with the magnetic resin layer 20 .

[0631] The first shielding member 30 is not divided into a plurality of shielding pieces 30P. In other words, the gap 50 is not formed in the first shielding member 30. The first shielding member 30 is a ferrite plate. The dimensions of the first shielding member 30 in the first direction D1 and the second direction D2 are 300 mm and 300 mm, respectively. In addition, the distance between the magnetic resin layer 20 and the first shielding member 30 is 1 mm.

[0632] The second shielding member 40 is formed of aluminum. The dimensions of the second shielding member 40 in the first direction D1 and the second direction D2 are 320 mm and 320 mm, respectively. In addition, the distance between the first shielding member 30 and the second shielding member 40 is 1 mm.

[0633] <Example 3-2>

[0634] In addition to Fig.36 In the example shown, the coil unit 5 of Example 3-2 is manufactured in the same manner as in Example 3-1 except that the first shield member 30 is divided into nine shield pieces 30P. The first shield member 30 is divided into three parts in the first direction D1 and into three parts in the second direction D2.

[0635] Each shielding piece 30P is a ferrite plate. The nine shielding pieces 30P are all quadrilaterals. The nine shielding pieces 30P have the same size in the first direction D1. In addition, the nine shielding pieces 30P have the same size in the second direction D2.

[0636] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0637] Eight of the twelve gaps 50 formed between the adjacent shielding small pieces 30P cross any one of the first to fourth straight line portion groups 11G to 14G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight line portion group 11G is orthogonal to the first straight line portion 11. When viewed in the axial direction, the gap 50 crossing the second straight line portion group 12G is orthogonal to the second straight line portion 12. When viewed in the axial direction, the gap 50 crossing the third straight line portion group 13G is orthogonal to the third straight line portion 13. When viewed in the axial direction, the gap 50 crossing the fourth straight line portion group 14G is orthogonal to the fourth straight line portion 14.

[0638] The remaining four gaps 50 extend in the first direction D1 or the second direction D2 between any one of the first to fourth straight portion groups 11G to 14G and the central axis C when viewed in the axial direction.

[0639] <Example 3-3>

[0640] The coil unit 5 of Example 3-3 was manufactured in the same manner as in Example 3-1 except that the first shield member 30 was divided into 12 small shield pieces 30P. The first shield member 30 was divided into four parts in the first direction D1 and into three parts in the second direction D2.

[0641] Each shielding piece 30P is a ferrite plate. The twelve shielding pieces 30P are all quadrilaterals. The twelve shielding pieces 30P have the same size in the first direction D1 and the same size in the second direction D2.

[0642] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0643] Two of the 17 gaps 50 formed between adjacent shielding small pieces 30P cross the first straight portion group 11G or the third straight portion group 13G when viewed in the axial direction. When viewed in the axial direction, the gaps 50 crossing the first straight portion group 11G are orthogonal to the first straight portion 11. When viewed in the axial direction, the gaps 50 crossing the third straight portion group 13G are orthogonal to the third straight portion 13.

[0644] Twelve of the 17 gaps 50 partially cross any one of the first A to first D intermediate curve portions 151G to 154G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first intermediate curve portion group 151G and the tangent TL1 of the first A intermediate curve portion group 151G form an angle of 45°. When viewed in the axial direction, the gap 50 crossing the first B intermediate curve portion group 152G and the tangent TL2 of the first B intermediate curve portion group 152G form an angle of 45°. When viewed in the axial direction, the gap 50 crossing the first C intermediate curve portion group 153G and the tangent TL3 of the first C intermediate curve portion group 153G form an angle of 45°. When viewed in the axial direction, the gap 50 crossing the first D intermediate curve portion group 154G and the tangent TL4 of the first D intermediate curve portion group 154G form an angle of 45°.

[0645] Two of the 17 gaps 50 extend along the second direction D2 in the second straight portion group 12G or the fourth straight portion group 14G when viewed in the axial direction. These gaps 50 overlap with the second straight portion 12 or the fourth straight portion 14 of the second turn portion 102 .

[0646] The remaining gap 50 extends along the second direction D2 between the second straight portion group 12G and the fourth straight portion group 14G when viewed in the axial direction. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0647] <Example 3-4>

[0648] like Figure 2As shown, the coil unit 5 of Example 3-4 is manufactured in the same manner as in Example 3-1 except that the first shield member 30 is divided into four small shield pieces 30P. The first shield member 30 is divided into two parts in the first direction D1 and in the second direction D2.

[0649] Each shielding piece 30P is a ferrite plate. The four shielding pieces 30P are all quadrilaterals. The sizes of the four shielding pieces 30P in the first direction D1 are equal to each other. In addition, the sizes of the four shielding pieces 30P in the second direction D2 are equal to each other.

[0650] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0651] The four gaps 50 formed between the adjacent shielding small pieces 30P cross any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 crossing the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 crossing the fourth straight portion group 14G is orthogonal to the fourth straight portion 14. The four gaps 50 are formed so that their extended lines pass through the central axis C.

[0652] <Example 3-5>

[0653] like Fig. 22 As shown, the coil unit 5 of Example 3-5 is manufactured in the same manner as Example 3-1 except that the first shield member 30 is divided into eight shield pieces 30P. The eight gaps 50 formed in the first shield member 30 extend radially from the central axis C when viewed in the axial direction.

[0654] Each shielding piece 30P is a ferrite plate. The eight shielding pieces 30P are all right triangles. The eight shielding pieces 30P have the same size in the first direction D1. In addition, the eight shielding pieces 30P have the same size in the second direction D2.

[0655] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0656] Four of the eight gaps 50 formed between adjacent shielding small pieces 30P cross any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 crossing the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 crossing the fourth straight portion group 14G is orthogonal to the fourth straight portion 14. These four gaps 50 are formed so that their extension lines pass through the central axis C.

[0657] The remaining four gaps cross any one of the first A to first D intermediate curve group 151G to 154G when viewed in the axial direction. When viewed in the axial direction, the gap 50 that crosses the first A intermediate curve group 151G is orthogonal to the tangent TL1 of the first A intermediate curve group 151G. When viewed in the axial direction, the gap 50 that crosses the first B intermediate curve group 152G is orthogonal to the tangent TL2 of the first B intermediate curve group 152G. When viewed in the axial direction, the gap 50 that crosses the first C intermediate curve group 153G is orthogonal to the tangent TL3 of the first C intermediate curve group 153G. When viewed in the axial direction, the gap 50 that crosses the first D intermediate curve group 154G is orthogonal to the tangent TL4 of the first D intermediate curve group 154G. These four gaps 50 are formed so that their extension lines pass through the central axis C.

[0658] <Example 3-6>

[0659] like Fig.38 As shown in FIG. 1 , the coil unit 5 of Example 3-6 is manufactured in the same manner as in Example 3-1 except that the first shield member 30 is divided into 12 small shield pieces 30P.

[0660] Each shielding piece 30P is a ferrite plate. Four of the twelve shielding pieces 30P are quadrilaterals, and the remaining eight shielding pieces 30P are right-angled triangles.

[0661] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0662] Eight of the 13 gaps 50 formed between adjacent shielding small pieces 30P cross any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 crossing the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 crossing the fourth straight portion group 14G is orthogonal to the fourth straight portion 14. These four gaps 50 are formed so that their extended lines pass through the central axis C.

[0663] Four of the 13 gaps 50 cross any one of the first A to first D intermediate curve group 151G to 154G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first A intermediate curve group 151G is orthogonal to the tangent TL1 of the first A intermediate curve group 151G. When viewed in the axial direction, the gap 50 crossing the first B intermediate curve group 152G is orthogonal to the tangent TL2 of the first B intermediate curve group 152G. When viewed in the axial direction, the gap 50 crossing the first C intermediate curve group 153G is orthogonal to the tangent TL3 of the first C intermediate curve group 153G. When viewed in the axial direction, the gap 50 crossing the first D intermediate curve group 154G is orthogonal to the tangent TL4 of the first D intermediate curve group 154G.

[0664] The remaining gap 50 extends along the second direction D2 between the second straight portion group 12G and the fourth straight portion group 14G when viewed in the axial direction. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0665] <Example 3-7>

[0666] like Fig.24 As shown in FIG. 1 , the coil unit 5 of Example 3-7 is manufactured in the same manner as in Example 3-1 except that the first shield member 30 is divided into 13 small shield pieces 30P.

[0667] Each shielding piece 30P is a ferrite plate. Five of the 13 shielding pieces 30P are quadrilaterals, and the remaining eight shielding pieces 30P are right-angled triangles.

[0668] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0669] Nine of the 14 gaps 50 formed between adjacent shielding small pieces 30P cross any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 crossing the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 crossing the fourth straight portion group 14G is orthogonal to the fourth straight portion 14.

[0670] Four of the 14 gaps 50 cross any one of the first A to first D intermediate curve group 151G to 154G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first A intermediate curve group 151G is orthogonal to the tangent TL1 of the first A intermediate curve group 151G. When viewed in the axial direction, the gap 50 crossing the first B intermediate curve group 152G is orthogonal to the tangent TL2 of the first B intermediate curve group 152G. When viewed in the axial direction, the gap 50 crossing the first C intermediate curve group 153G is orthogonal to the tangent TL3 of the first C intermediate curve group 153G. When viewed in the axial direction, the gap 50 crossing the first D intermediate curve group 154G is orthogonal to the tangent TL4 of the first D intermediate curve group 154G.

[0671] The remaining gap 50 extends along the second direction D2 between the second straight portion group 12G and the fourth straight portion group 14G when viewed in the axial direction. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0672] (Evaluation of Example 3)

[0673] A high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Examples 3-1 to 3-7 manufactured in this manner, and the Q value, loss, impedance, and inductance of the coil unit 5 were measured. Fig.48 The measurement results are shown. Fig.48 In the figure, "Q value", "impedance" and "inductance" represent the Q value, impedance and inductance of the coil unit 5. "SLD2" represents the second shielding component 40. "Joule loss" represents the loss caused by the current of the coil 10 or the second shielding component 40. "Iron loss" represents the loss caused by the magnetic flux of the first shielding component 30. "Total loss" is the sum of "Joule loss" and "iron loss". "NP" is the number of divisions of the first shielding component 30 (the number of shielding pieces 30P included in the first shielding component 30). For example, "NP9" means that the first shielding component 30 is divided into 9 pieces, and "NP12" means that the first shielding component 30 is divided into 12 pieces. Among them, "NP1" means that the first shielding component 30 is not divided.

[0674] <Example 4-1>

[0675] In addition to Fig.43 In the example shown, the coil unit 5 of Example 4-1 is manufactured in the same manner as in Example 3-1 except that the coil element 10i is formed in a regular octagonal shape as a whole. The first shield member 30 is not divided into a plurality of shielding pieces 30P. In other words, the gap 50 is not formed in the first shield member 30 .

[0676] The coil 10 is formed of copper, and has a line width of 6 mm and a thickness of 0.5 mm. In addition, the distance between adjacent turns 101, 102; ...; 107, 108 is 6 mm. The dimensions of the coil 10 along the first direction D1 and the second direction D2 are 295 mm and 295 mm, respectively.

[0677] The first shielding member 30 is a ferrite plate, and the dimensions of the first shielding member 30 in the first direction D1 and the second direction D2 are 300 mm and 300 mm, respectively.

[0678] <Example 4-2>

[0679] The coil unit 5 of Example 4-2 is manufactured in the same manner as Example 4-1 except that the first shield member 30 is divided into nine shield pieces 30P as in Example 3-2. The first shield member 30 is divided into three parts in the first direction D1 and into three parts in the second direction D2.

[0680] Each shielding piece 30P is a ferrite plate. The nine shielding pieces 30P are all quadrilaterals. The nine shielding pieces 30P have the same size in the first direction D1. In addition, the nine shielding pieces 30P have the same size in the second direction D2.

[0681] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0682] The twelve gaps 50 formed between the adjacent shield small pieces 30P cross at least a portion of any of the first to fourth straight line portion groups 11G to 14G and the first A to first D intermediate straight line portion groups 161G to 164G when viewed in the axial direction.

[0683] When viewed in the axial direction, the gap 50 that crosses at least a portion of the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 that crosses at least a portion of the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 that crosses at least a portion of the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 that crosses at least a portion of the fourth straight portion group 14G is orthogonal to the fourth straight portion 14.

[0684] When viewed in the axial direction, the gap 50 that crosses at least a portion of the first A intermediate straight portion group 161G forms an angle of 45° with the first A intermediate straight portion group 161G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first B intermediate straight portion group 162G forms an angle of 45° with the first B intermediate straight portion group 162G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first C intermediate straight portion group 163G forms an angle of 45° with the first C intermediate straight portion group 163G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first D intermediate straight portion group 164G forms an angle of 45° with the first D intermediate straight portion group 164G.

[0685] <Example 4-3>

[0686] The coil unit 5 of Example 4-3 is manufactured in the same manner as Example 4-1 except that the first shield member 30 is divided into 12 shield pieces 30P as in Example 3-3. The first shield member 30 is divided into four parts in the first direction D1 and into three parts in the second direction D2.

[0687] Each shielding piece 30P is a ferrite plate. The twelve shielding pieces 30P are all quadrilaterals. The twelve shielding pieces 30P have the same size in the first direction D1 and the same size in the second direction D2.

[0688] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0689] Sixteen of the seventeen gaps 50 formed between adjacent shield small pieces 30P cross at least a portion of any one of the first to fourth straight line portion groups 11G to 14G and the first A to first D intermediate straight line portion groups 161G to 164G as viewed in the axial direction.

[0690] When viewed in the axial direction, the gap 50 that crosses at least a portion of the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 that crosses at least a portion of the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 that crosses at least a portion of the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 that crosses at least a portion of the fourth straight portion group 14G is orthogonal to the fourth straight portion 14.

[0691] When viewed in the axial direction, the gap 50 that crosses at least a portion of the first A intermediate straight portion group 161G forms an angle of 45° with the first A intermediate straight portion group 161G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first B intermediate straight portion group 162G forms an angle of 45° with the first B intermediate straight portion group 162G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first C intermediate straight portion group 163G forms an angle of 45° with the first C intermediate straight portion group 163G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first D intermediate straight portion group 164G forms an angle of 45° with the first D intermediate straight portion group 164G.

[0692] The remaining gap 50 extends along the second direction D2 between the second straight portion group 12G and the fourth straight portion group 14G when viewed in the axial direction. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0693] <Example 4-4>

[0694] The coil unit 5 of Example 4-4 is manufactured in the same manner as Example 4-1 except that the first shield member 30 is divided into four shield pieces 30P as in Example 3-4. The first shield member 30 is divided into two parts in the first direction D1 and in the second direction D2.

[0695] Each shielding piece 30P is a ferrite plate. The four shielding pieces 30P are all quadrilaterals. The sizes of the four shielding pieces 30P in the first direction D1 are equal to each other. In addition, the sizes of the four shielding pieces 30P in the second direction D2 are equal to each other.

[0696] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0697] The four gaps 50 formed between the adjacent shielding small pieces 30P cross any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 crossing the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 crossing the fourth straight portion group 14G is orthogonal to the fourth straight portion 14. The four gaps 50 are formed so that their extended lines pass through the central axis C.

[0698] <Example 4-5>

[0699] The coil unit 5 of Example 4-5 was manufactured in the same manner as Example 4-1 except that the first shield member 30 was divided into eight shield pieces 30P as in Example 3-5. The eight gaps 50 formed in the first shield member 30 extend radially from the central axis C when viewed in the axial direction.

[0700] Each shielding piece 30P is a ferrite plate. The eight shielding pieces 30P are all right triangles. The eight shielding pieces 30P have the same size in the first direction D1. In addition, the eight shielding pieces 30P have the same size in the second direction D2.

[0701] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0702] Four of the eight gaps 50 formed between adjacent shielding small pieces 30P cross any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 crossing the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 crossing the fourth straight portion group 14G is orthogonal to the fourth straight portion 14. These four gaps 50 are formed so that their extension lines pass through the central axis C.

[0703] The remaining four gaps cross any one of the first A to first D intermediate straight portion groups 161G to 164G when viewed in the axial direction. When viewed in the axial direction, the gap 50 that crosses the first A intermediate straight portion group 161G is orthogonal to the first A intermediate straight portion group 161G. When viewed in the axial direction, the gap 50 that crosses the first B intermediate straight portion group 162G is orthogonal to the first B intermediate straight portion group 162G. When viewed in the axial direction, the gap 50 that crosses the first C intermediate straight portion group 163G is orthogonal to the first C intermediate straight portion group 163G. When viewed in the axial direction, the gap 50 that crosses the first D intermediate straight portion group 164G is orthogonal to the first D intermediate straight portion group 164G. These four gaps 50 are formed so that their extended lines pass through the central axis C.

[0704] <Example 4-6>

[0705] The coil unit 5 of Example 4-6 was manufactured in the same manner as in Example 4-1, except that the first shield member 30 was divided into 12 small shield pieces 30P in the same manner as in Example 3-6.

[0706] Each shielding piece 30P is a ferrite plate. Four of the twelve shielding pieces 30P are quadrilaterals, and the remaining eight shielding pieces 30P are right-angled triangles.

[0707] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0708] Eight of the 13 gaps 50 formed between adjacent shielding small pieces 30P cross any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 crossing the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 crossing the fourth straight portion group 14G is orthogonal to the fourth straight portion 14. These four gaps 50 are formed so that their extended lines pass through the central axis C.

[0709] Four of the 13 gaps 50 described above cross any one of the first A to first D intermediate straight portion groups 161G to 164G when viewed in the axial direction. When viewed in the axial direction, the gap 50 that crosses the first A intermediate straight portion group 161G is orthogonal to the first A intermediate straight portion group 161G. When viewed in the axial direction, the gap 50 that crosses the first B intermediate straight portion group 162G is orthogonal to the first B intermediate straight portion group 162G. When viewed in the axial direction, the gap 50 that crosses the first C intermediate straight portion group 163G is orthogonal to the first C intermediate straight portion group 163G. When viewed in the axial direction, the gap 50 that crosses the first D intermediate straight portion group 164G is orthogonal to the first D intermediate straight portion group 164G.

[0710] The remaining gap 50 extends along the second direction D2 between the second straight portion group 12G and the fourth straight portion group 14G when viewed in the axial direction. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0711] <Example 4-7>

[0712] The coil unit 5 of Example 4-7 was manufactured in the same manner as in Example 4-1, except that the first shield member 30 was divided into 13 small shield pieces 30P in the same manner as in Example 3-7.

[0713] Each shielding piece 30P is a ferrite plate. Five of the 13 shielding pieces 30P are quadrilaterals, and the remaining eight shielding pieces 30P are right-angled triangles.

[0714] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0715] Nine of the 14 gaps 50 formed between adjacent shielding small pieces 30P cross any one of the first to fourth straight portion groups 11G to 14G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 crossing the third straight portion group 13G is orthogonal to the third straight portion 13. When viewed in the axial direction, the gap 50 crossing the fourth straight portion group 14G is orthogonal to the fourth straight portion 14.

[0716] Four of the 14 gaps 50 cross any one of the first A to first D intermediate curve group 151G to 154G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first A intermediate curve group 151G is orthogonal to the tangent TL1 of the first A intermediate curve group 151G. When viewed in the axial direction, the gap 50 crossing the first B intermediate curve group 152G is orthogonal to the tangent TL2 of the first B intermediate curve group 152G. When viewed in the axial direction, the gap 50 crossing the first C intermediate curve group 153G is orthogonal to the tangent TL3 of the first C intermediate curve group 153G. When viewed in the axial direction, the gap 50 crossing the first D intermediate curve group 154G is orthogonal to the tangent TL4 of the first D intermediate curve group 154G.

[0717] The remaining gap 50 extends along the second direction D2 between the second straight portion group 12G and the fourth straight portion group 14G when viewed in the axial direction. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0718] (Evaluation of Example 4)

[0719] A high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Examples 4-1 to 4-7 manufactured in this manner, and the Q value, loss, impedance, and inductance of the coil unit 5 were measured. Fig.49 The measurement results are shown. Fig.49 In the figure, "Q value", "impedance" and "inductance" represent the Q value, impedance and inductance of the coil unit 5. "SLD2" represents the second shielding component 40. "Joule loss" represents the loss caused by the current of the coil 10 or the second shielding component 40. "Iron loss" represents the loss caused by the magnetic flux of the first shielding component 30. "Total loss" is the sum of "Joule loss" and "iron loss". "NP" is the number of divisions of the first shielding component 30 (the number of shielding pieces 30P included in the first shielding component 30). For example, "NP9" means that the first shielding component 30 is divided into 9 pieces, and "NP12" means that the first shielding component 30 is divided into 12 pieces. Among them, "NP1" means that the first shielding component 30 is not divided.

[0720] (Comparison between Example 3 and Example 4)

[0721] Fig.50 The Q values ​​of the coil units 5 of Examples 3-1 to 3-7 and Examples 4-1 to 4-7 are shown. Fig.50 In the examples, E3-1 to E3-7 represent Examples 3-1 to 3-7, respectively. Fig.50 In the examples, E4-1 to E4-7 represent Examples 4-1 to 4-7, respectively. Fig.50 It can be understood that, if other conditions are the same, the Q value of the coil unit 5 including the coil 10 having an overall octagonal shape is higher than the Q value of the coil unit 5 including the coil 10 having an overall quadrilateral shape and including the first intermediate curved portions 151G to 154G.

[0722] <Example 5-1>

[0723] Next, as the coil unit 5 of Example 5-1, Figures 17 to 19 As shown in FIG. 1 , a coil unit 5 including a coil 10 including coil elements 10 j and 10 jj formed in a spiral shape, a magnetic resin layer 20 , a first shield member 30 , and a second shield member 40 is prepared.

[0724] Coil 10 and Figures 17 to 19 The coil 10 shown is formed in the same manner. The coil elements 10j, 10jj are formed of copper, and have a line width of 6 mm and a thickness of 0.5. In addition, in each coil element 10j, 10jj, the distance between adjacent turns 101, 102; ...; 104, 105 is 6 mm. The dimensions of the coil 10 along the first direction D1 and the second direction D2 are 295 mm and 295 mm, respectively.

[0725] The magnetic resin layer 20 is formed by curing a two-component curable epoxy resin mixed with magnetic powder. Fig.18 As shown, the coil 10 is embedded in the magnetic resin layer 20 , and the second main surface 10 b of the coil 10 is in close contact with the magnetic resin layer 20 .

[0726] The first shielding member 30 is not divided into a plurality of shielding pieces 30P. In other words, no gap 50 is formed in the first shielding member 30. The first shielding member 30 is a ferrite plate. The dimensions of the first shielding member 30 in the first direction D1 and the second direction D2 are 300 mm and 300 mm, respectively.

[0727] In addition, the distance between the magnetic resin layer 20 and the first shield member 30 is 0 mm. That is, the magnetic resin layer 20 and the first shield member 30 are in close contact with each other.

[0728] The second shielding member 40 is formed of aluminum. The dimensions of the second shielding member 40 in the first direction D1 and the second direction D2 are 320 mm and 320 mm, respectively. In addition, the distance between the first shielding member 30 and the second shielding member 40 is 1 mm.

[0729] <Example 5-2>

[0730] In addition to Fig. 20 In the example shown, the coil unit 5 of Example 5-2 is manufactured in the same manner as in Example 5-1 except that the first shield member 30 is divided into nine shielding pieces 30P. The first shield member 30 is divided into three parts in the first direction D1 and into three parts in the second direction D2.

[0731] Each shielding piece 30P is a ferrite plate. The nine shielding pieces 30P are all quadrilaterals. The nine shielding pieces 30P have the same size in the first direction D1. In addition, the nine shielding pieces 30P have the same size in the second direction D2.

[0732] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0733] Six of the twelve gaps 50 formed between the adjacent shielding small pieces 30P cross any one of the first to third straight line portion groups 11G to 13G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight line portion group 11G is orthogonal to the first straight line portion 11. When viewed in the axial direction, the gap 50 crossing the second straight line portion group 12G is orthogonal to the second straight line portion 12. When viewed in the axial direction, the gap 50 crossing the third straight line portion group 13G is orthogonal to the third straight line portion 13.

[0734] Two of the twelve gaps 50 cross the plurality of turn connecting portions 16 .

[0735] The remaining four gaps 50 extend between any one of the first to fourth straight portion groups 11G to 14G and the central axis C when viewed in the axial direction.

[0736] <Example 5-3>

[0737] The coil unit 5 of Example 5-3 was manufactured in the same manner as in Example 5-1 except that the first shield member 30 was divided into 12 small shield pieces 30P. The first shield member 30 was divided into three parts in the first direction D1 and into four parts in the second direction D2.

[0738] Each shielding piece 30P is a ferrite plate. The twelve shielding pieces 30P are all quadrilaterals. The twelve shielding pieces 30P have the same size in the first direction D1 and the same size in the second direction D2.

[0739] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0740] One of the 17 gaps 50 formed between the adjacent shield small pieces 30P crosses the second straight portion group 12G when viewed in the axial direction. The gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12 when viewed in the axial direction.

[0741] Twelve of the 17 gaps 50 cross at least a portion of any one of the first A to first D intermediate curve portions 151G to 154G when viewed in the axial direction. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first A intermediate curve portion group 151G and the tangent TL1 of the first A intermediate curve portion group 151G form an angle of 45°. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first B intermediate curve portion group 152G and the tangent TL2 of the first B intermediate curve portion group 152G form an angle of 45°. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first C intermediate curve portion group 153G and the tangent TL3 of the first C intermediate curve portion group 153G form an angle of 45°. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first D intermediate curve portion group 154G and the tangent TL4 of the first D intermediate curve portion group 154G form an angle of 45°.

[0742] One of the 17 gaps 50 crosses the plurality of turn connecting portions 16 when viewed in the axial direction.

[0743] Two of the 17 gaps 50 extend along the first direction D1 in the first straight portion group 11G or the third straight portion group 13G when viewed in the axial direction. These gaps 50 overlap with the first straight portion 11 or the third straight portion 13 of the second turn portion 102 .

[0744] The remaining gap 50 extends along the first direction D1 between the first straight portion group 11G and the third straight portion group 13G when viewed in the axial direction. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0745] <Example 5-4>

[0746] like Fig.23 As shown, the coil unit 5 of Example 5-4 is manufactured in the same manner as Example 5-1 except that the first shield member 30 is divided into eight shield pieces 30P. The eight gaps 50 formed in the first shield member 30 extend radially from the central axis C when viewed in the axial direction.

[0747] Each shielding piece 30P is a ferrite plate. The eight shielding pieces 30P are all right triangles. The eight shielding pieces 30P have the same size in the first direction D1. In addition, the eight shielding pieces 30P have the same size in the second direction D2.

[0748] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0749] Three of the eight gaps 50 formed between adjacent shielding small pieces 30P cross any one of the first to third straight portion groups 11G to 13G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 crossing the third straight portion group 13G is orthogonal to the third straight portion 13. These four gaps 50 are formed so that their extended lines pass through the central axis C.

[0750] One of the eight gaps 50 crosses the plurality of turn connecting portions 16 when viewed in the axial direction. The gap 50 is formed so that an extension line thereof passes through the central axis C.

[0751] The remaining four gaps cross any one of the first A to first D intermediate curve group 151G to 154G when viewed in the axial direction. When viewed in the axial direction, the gap 50 that crosses the first A intermediate curve group 151G is orthogonal to the tangent TL1 of the first A intermediate curve group 151G. When viewed in the axial direction, the gap 50 that crosses the first B intermediate curve group 152G is orthogonal to the tangent TL2 of the first B intermediate curve group 152G. When viewed in the axial direction, the gap 50 that crosses the first C intermediate curve group 153G is orthogonal to the tangent TL3 of the first C intermediate curve group 153G. When viewed in the axial direction, the gap 50 that crosses the first D intermediate curve group 154G is orthogonal to the tangent TL4 of the first D intermediate curve group 154G. These four gaps 50 are formed so that their extension lines pass through the central axis C.

[0752] <Example 5-5>

[0753] like Fig.33 As shown in FIG. 1 , the coil unit 5 of Example 5-5 is manufactured in the same manner as in Example 5-1, except that the first shield member 30 is divided into 12 small shield pieces 30P.

[0754] Each shielding piece 30P is a ferrite plate. Four of the twelve shielding pieces 30P are quadrilaterals, and the remaining eight shielding pieces 30P are right-angled triangles.

[0755] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0756] Six of the 13 gaps 50 formed between adjacent shielding small pieces 30P cross any one of the first to third straight line portion groups 11G to 13G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first straight line portion group 11G is orthogonal to the first straight line portion 11. When viewed in the axial direction, the gap 50 crossing the second straight line portion group 12G is orthogonal to the second straight line portion 12. When viewed in the axial direction, the gap 50 crossing the third straight line portion group 13G is orthogonal to the third straight line portion 13.

[0757] Two of the 13 gaps 50 extend across the plurality of turn connecting portions 16 when viewed in the axial direction.

[0758] Four of the 13 gaps 50 cross at least a portion of the first A to first D intermediate curve group 151G to 154G when viewed in the axial direction. When viewed in the axial direction, the gap 50 crossing the first A intermediate curve group 151G is orthogonal to the tangent TL1 of the first A intermediate curve group 151G. When viewed in the axial direction, the gap 50 crossing the first B intermediate curve group 152G is orthogonal to the tangent TL2 of the first B intermediate curve group 152G. When viewed in the axial direction, the gap 50 crossing the first C intermediate curve group 153G is orthogonal to the tangent TL3 of the first C intermediate curve group 153G. When viewed in the axial direction, the gap 50 crossing the first D intermediate curve group 154G is orthogonal to the tangent TL4 of the first D intermediate curve group 154G.

[0759] The remaining gap 50 extends along the second direction D2 between the second straight portion group 12G and the plurality of turn connecting portions 16 when viewed in the axial direction. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0760] (Evaluation of Example 5)

[0761] A high-frequency current of 85 kHz was passed through the coil 10 of the coil unit 5 of Examples 5-1 to 5-5 manufactured in this manner, and the Q value, loss, impedance, and inductance of the coil unit 5 were measured. Fig.51 The measurement results are shown. Fig.51 In the figure, "Q value", "impedance" and "inductance" represent the Q value, impedance and inductance of the coil unit 5. "SLD2" represents the second shielding component 40. "Joule loss" represents the loss caused by the current of the coil 10 or the second shielding component 40. "Iron loss" represents the loss caused by the magnetic flux of the first shielding component 30. "Total loss" is the sum of "Joule loss" and "iron loss". "NP" is the number of divisions of the first shielding component 30 (the number of shielding pieces 30P included in the first shielding component 30). For example, "NP9" means that the first shielding component 30 is divided into 9 pieces, and "NP12" means that the first shielding component 30 is divided into 12 pieces. Among them, "NP1" means that the first shielding component 30 is not divided.

[0762] <Example 6-1>

[0763] In addition to Fig.45 In the example shown, the coil unit 5 of Example 6-1 is manufactured in the same manner as in Example 5-1 except that the coil elements 10j and 10jj are formed in a regular octagonal shape as a whole. The first shield member 30 is not divided into a plurality of shielding pieces 30P. In other words, the gap 50 is not formed in the first shield member 30 .

[0764] The coil 10 is made of copper, and has a line width of 6 mm and a thickness of 0.5 mm. In addition, the distance between adjacent turns 101, 102; ...; 104, 105 is 6 mm. The dimensions of the coil 10 along the first direction D1 and the second direction D2 are 295 mm and 295 mm, respectively.

[0765] The first shielding member 30 is a ferrite plate, and the dimensions of the first shielding member 30 in the first direction D1 and the second direction D2 are 300 mm and 300 mm, respectively.

[0766] <Example 6-2>

[0767] The coil unit 5 of Example 6-2 is manufactured in the same manner as Example 6-1 except that the first shield member 30 is divided into nine shield pieces 30P as in Example 5-2. The first shield member 30 is divided into three parts in the first direction D1 and into three parts in the second direction D2.

[0768] Each shielding piece 30P is a ferrite plate. The nine shielding pieces 30P are all quadrilaterals. The nine shielding pieces 30P have the same size in the first direction D1. In addition, the nine shielding pieces 30P have the same size in the second direction D2.

[0769] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0770] The twelve gaps 50 formed between the adjacent shield small pieces 30P cross at least a portion of any one of the first to third straight line portion groups 11G to 13G and the first A to first D intermediate straight line portion groups 161G to 164G as viewed in the axial direction.

[0771] When viewed in the axial direction, the gap 50 that crosses at least a portion of the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 that crosses at least a portion of the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 that crosses at least a portion of the third straight portion group 13G is orthogonal to the third straight portion 13.

[0772] When viewed in the axial direction, the gap 50 that crosses at least a portion of the first A intermediate straight portion group 161G forms an angle of 45° with the first A intermediate straight portion group 161G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first B intermediate straight portion group 162G forms an angle of 45° with the first B intermediate straight portion group 162G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first C intermediate straight portion group 163G forms an angle of 45° with the first C intermediate straight portion group 163G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first D intermediate straight portion group 164G forms an angle of 45° with the first D intermediate straight portion group 164G.

[0773] <Example 6-3>

[0774] The coil unit 5 of Example 6-3 is manufactured in the same manner as Example 6-1 except that the first shield member 30 is divided into 12 shield pieces 30P of Example 5-3. The first shield member 30 is divided into three parts in the first direction D1 and into four parts in the second direction D2.

[0775] Each shielding piece 30P is a ferrite plate. The twelve shielding pieces 30P are all quadrilaterals. The twelve shielding pieces 30P have the same size in the first direction D1 and the same size in the second direction D2.

[0776] The width of the gap 50 between adjacent shield patches 30P is 5 mm.

[0777] One of the 17 gaps 50 formed between the adjacent shield small pieces 30P crosses the second straight portion group 12G when viewed in the axial direction. The gap 50 crossing the second straight portion group 12G is orthogonal to the second straight portion 12 when viewed in the axial direction.

[0778] Twelve of the 17 gaps 50 cross at least a portion of any one of the first to third straight portion groups 11G to 13G and the first A to first D intermediate straight portion groups 161G to 164G when viewed in the axial direction.

[0779] When viewed in the axial direction, the gap 50 that crosses at least a portion of the first straight portion group 11G is orthogonal to the first straight portion 11. When viewed in the axial direction, the gap 50 that crosses at least a portion of the second straight portion group 12G is orthogonal to the second straight portion 12. When viewed in the axial direction, the gap 50 that crosses at least a portion of the third straight portion group 13G is orthogonal to the third straight portion 13.

[0780] When viewed in the axial direction, the gap 50 that crosses at least a portion of the first A intermediate straight portion group 161G forms an angle of 45° with the first A intermediate straight portion group 161G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first B intermediate straight portion group 162G forms an angle of 45° with the first B intermediate straight portion group 162G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first C intermediate straight portion group 163G forms an angle of 45° with the first C intermediate straight portion group 163G. When viewed in the axial direction, the gap 50 that crosses at least a portion of the first D intermediate straight portion group 164G forms an angle of 45° with the first D intermediate straight portion group 164G.

[0781] Two of the twelve gaps 50 extend along the first direction D1 in the first straight portion group 11G or the third straight portion group 13G when viewed in the axial direction. These gaps 50 overlap with the first straight portion 11 or the third straight portion 13 of the second turn portion 102 .

[0782] One of the 17 gaps 50 crosses the plurality of turn connecting portions 16 when viewed in the axial direction.

[0783] The remaining gap 50 extends along the first direction D1 between the first straight portion group 11G and the third straight portion group 13G when viewed in the axial direction. The gap 50 overlaps with the central axis C when viewed in the axial direction.

[0784] <Example 6-4>

[0785] The coil unit 5 of Example 6-4 was manufactured in the same manner as Example 6-1 except that the first shield member 30 was divided into eight shield pieces 30P as in Example 5-4. The eight gaps 50 formed in the first shield member 30 extend radially from the central axis C when viewed in the axial direction.

[0786] Each sh...

Claims

1. A coil unit, wherein: The coil unit includes a coil including a coil element formed in a spiral shape around an arbitrary central axis, a magnetic resin layer, a first shielding member, and a second shielding member. The coil has a first main surface and a second main surface which is a surface opposite to the first main surface. The magnetic resin layer is in direct contact with the second main surface of the coil. The coil, the magnetic resin layer, the first shield member, and the second shield member are stacked in this order from the first main surface toward the second main surface. The first shielding member is divided into a plurality of shielding pieces.

2. The coil unit according to claim 1, wherein: The coil element includes a conductor having a spiral shape, The magnetic resin layer is in direct contact with the conductor.

3. The coil unit according to claim 1 or 2, wherein: The first shielding member includes ferrite.

4. The coil unit according to any one of claims 1 to 3, wherein: The distance between the first shielding member and the second shielding member is less than 2 mm.

5. The coil unit according to any one of claims 1 to 4, wherein: A heat conduction member is arranged between the first shielding member and the second shielding member.

6. The coil unit according to any one of claims 1 to 5, wherein: The coil element includes: a first straight line portion group, the first straight line portion group is composed of a plurality of first straight line portions arranged in a radial direction and extending in a first direction; a second straight line portion group, the second straight line portion group is composed of a plurality of second straight line portions arranged in a radial direction and extending in a second direction that is not parallel to the first direction, each second straight line portion is connected to an adjacent first straight line portion, The first shield member has a gap formed therein. The gap extends linearly between adjacent shield segments and crosses at least a portion of the first linear portion group when viewed in the axial direction.

7. The coil unit according to claim 6, wherein: When viewed in the axial direction, an angle formed by the gap and at least a portion of the first straight portion group is 80° to 100°.

8. The coil unit according to claim 6 or 7, wherein: The gap is orthogonal to at least a portion of the first straight line portion group when viewed in the axial direction.

9. The coil unit according to any one of claims 6 to 8, wherein: The gap extends from a position radially inward of the first straight portion group to a position radially outward of the first straight portion group.

10. The coil unit according to any one of claims 6 to 9, wherein: The gap extends between the second straight portion group and the central axis when viewed in the axial direction.

11. The coil unit according to any one of claims 6 to 9, wherein: When viewed in the axial direction, the gap or its extension line overlaps with the central axis.

12. The coil unit according to any one of claims 6 to 11, wherein: Another gap is formed in the first shielding component, and the other gap extends linearly between adjacent shielding pieces and extends along the first straight line portion within the first straight line portion group when viewed in the axial direction. The other gap extends at a position closer to the central axis than the first straight line portion that is the smallest integer number counted from the innermost first straight line portion among the plurality of first straight line portions, wherein the smallest integer is a smallest integer greater than a value obtained by dividing the total number of the plurality of first straight line portions by 3.

13. The coil unit according to any one of claims 6 to 11, wherein: Another gap is formed in the first shielding component, and the other gap extends linearly between adjacent shielding pieces and extends along the second straight line portion in the second straight line portion group when viewed in the axial direction. The other gap extends at a position closer to the central axis than the second straight line portion that is the smallest integer number counted from the innermost second straight line portion among the plurality of second straight line portions, wherein the smallest integer is a smallest integer greater than a value obtained by dividing the total number of the plurality of second straight line portions by 3.

14. The coil unit according to any one of claims 6 to 11, wherein: Another gap is formed in the first shielding component, and the other gap extends linearly between adjacent shielding pieces and extends along the first straight line portion within the first straight line portion group when viewed in the axial direction. The other gap extends at a position on the opposite side of the central axis side than the first straight line portion that is the smallest integer number counted from the outermost first straight line portion among the plurality of first straight line portions, and the smallest integer is the smallest integer greater than the value obtained by dividing the total number of the plurality of first straight line portions by 3.

15. The coil unit according to any one of claims 6 to 11, wherein: Another gap is formed in the first shielding component, and the other gap extends linearly between adjacent shielding pieces and extends along the second straight line portion in the second straight line portion group when viewed in the axial direction. The other gap extends at a position on the opposite side of the central axis side than the second straight line portion that is the smallest integer number counted from the outermost second straight line portion among the plurality of second straight line portions, and the smallest integer is the smallest integer greater than the value obtained by dividing the total number of the plurality of second straight line portions by 3.

16. The coil unit according to claim 1, wherein: The coil element further comprises: a first straight line portion group, the first straight line portion group being composed of a plurality of first straight line portions arranged in a radial direction and extending in a first direction; a second straight line portion group, the second straight line portion group being composed of a plurality of second straight line portions arranged in a radial direction and extending in a second direction that is not parallel to the first direction; an intermediate curve portion group, the intermediate curve portion group being arranged between the first straight portion group and the second straight portion group and being composed of a plurality of intermediate curve portions; Adjacent ends of the first straight portion and the second straight portion are connected via the intermediate curved portion.

17. The coil unit according to claim 16, wherein: A gap is formed in the first shield member. The gap extends linearly between adjacent shield segments and crosses at least a portion of the intermediate curved portion group when viewed in the axial direction.

18. The coil unit according to claim 17, wherein: When viewed in the axial direction, an angle formed between the gap and a tangent line of at least a portion of the intermediate curved portion group is 80° to 100°.

19. The coil unit according to claim 18, wherein: When viewed in the axial direction, the gap is orthogonal to the tangent line.

20. The coil unit according to claim 1, wherein: The coil element further comprises: a first straight line portion group, the first straight line portion group being composed of a plurality of first straight line portions arranged in a radial direction and extending in a first direction; a second straight line portion group, the second straight line portion group being composed of a plurality of second straight line portions arranged in a radial direction and extending in a second direction that is not parallel to the first direction; a first intermediate straight portion group, the first intermediate straight portion group being arranged between the first straight portion group and the second straight portion group and being composed of a plurality of first intermediate straight portions; Adjacent ends of the first straight portion and the second straight portion are connected via the first intermediate straight portion.

21. The coil unit according to claim 20, wherein: When viewed along the axial direction, the angle between the first straight portion and the first intermediate straight portion is 125° to 145°. When viewed along the axial direction, an angle formed by the second straight portion and the first intermediate straight portion is 125° to 145°.

22. The coil unit according to claim 20 or 21, wherein: When viewed along the axial direction, the angle between the first straight portion and the first intermediate straight portion is 135°. When viewed along the axial direction, the angle formed by the second straight portion and the first intermediate straight portion is 135°.

23. The coil unit according to any one of claims 20 to 22, wherein: The coil element is in an octagonal shape as a whole.

24. The coil unit according to any one of claims 20 to 23, wherein: The coil element is in a regular octagonal shape as a whole.

25. The coil unit according to any one of claims 20 to 24, wherein: The first shield member has a gap formed therein. The gap extends linearly between adjacent shield segments and crosses at least a portion of the first intermediate linear portion group when viewed in the axial direction.

26. The coil unit according to claim 25, wherein: When viewed in the axial direction, an angle formed by the gap and the at least a portion of the first intermediate straight portion group is 80° to 100°.

27. The coil unit according to claim 25 or 26, wherein: The gap is orthogonal to the at least a portion of the first intermediate straight portion group when viewed in the axial direction.

28. The coil unit according to claim 1, wherein: The coil element further comprises: a first straight line portion group, the first straight line portion group being composed of a plurality of first straight line portions arranged in a radial direction and extending in a first direction; a second straight line portion group, the second straight line portion group being composed of a plurality of second straight line portions arranged in a radial direction and extending in a second direction that is not parallel to the first direction; a first intermediate straight portion group, the first intermediate straight portion group being arranged between the first straight portion group and the second straight portion group and being composed of a plurality of first intermediate straight portions; a second intermediate straight portion group, the second intermediate straight portion group being arranged between the first intermediate straight portion group and the second intermediate straight portion group and being composed of a plurality of second intermediate straight portions; The adjacent ends of the first straight portion and the second straight portion are connected via the first intermediate straight portion. Adjacent ends of the first intermediate straight portion and the second intermediate straight portion are connected via the second intermediate straight portion.

29. The coil unit according to claim 28, wherein: When viewed along the axial direction, the angle between the first straight portion and the first intermediate straight portion is 140° to 160°. When viewed along the axial direction, the angle between the first middle straight portion and the second middle straight portion is 140° to 160°. When viewed along the axial direction, an angle formed by the second intermediate straight portion and the second straight portion is 140° to 160°.

30. The coil unit according to claim 28 or 29, wherein: When viewed along the axial direction, the angle between the first straight portion and the first intermediate straight portion is 150°. When viewed along the axial direction, the angle between the first middle straight portion and the second middle straight portion is 150°. When viewed along the axial direction, an angle formed by the second intermediate straight portion and the second straight portion is 150°.

31. The coil unit according to any one of claims 28 to 30, wherein: The coil element is in a dodecagonal shape as a whole.

32. The coil unit according to any one of claims 28 to 31, wherein: The coil element is in the shape of a regular dodecagon as a whole.

33. The coil unit according to any one of claims 28 to 32, wherein: The first shield member has a gap formed therein. The gap extends linearly between adjacent shield segments and crosses at least a portion of the first intermediate linear portion group or at least a portion of the second intermediate linear portion group when viewed in the axial direction.

34. The coil unit according to claim 33, wherein: When viewed in the axial direction, an angle formed between the gap and at least a portion of the first intermediate straight portion group or at least a portion of the second intermediate straight portion group is 80° to 100°.

35. The coil unit according to claim 33 or 34, wherein: The gap is orthogonal to the at least a portion of the first intermediate straight line portion group or the at least a portion of the second intermediate straight line portion group when viewed in the axial direction.

36. The coil unit according to claim 1, wherein: A gap is formed in the first shielding member, the gap extending linearly between adjacent shielding pieces and crossing at least a portion of the coil element when viewed in the axial direction. When viewed in the axial direction, the gap intersects at least a portion of the plurality of turns forming the coil element. When viewed along the axial direction, at the point where the gap intersects the turn, the angle formed by the gap and the turn or the tangent of the turn is 80° to 100°.

37. The coil unit according to claim 36, wherein: Viewed in the axial direction, at the point where the gap intersects the turn, the gap is orthogonal to the turn or a tangent to the turn.

38. The coil unit according to claim 1, wherein: The coil unit further includes a first connection terminal connected to the coil. The coil has an inner end close to the central axis and an outer end away from the central axis, The first connecting terminal is connected to the inner end portion and extends from the inner side of the coil to the outer side. A gap is formed in the first shielding member, the gap extending linearly between adjacent shielding pieces and extending from the inner side to the outer side of the coil, When viewed in the axial direction, the first connecting terminal extends in the gap or in a cutout formed in the shielding chip.

39. The coil unit according to claim 38, wherein: The first connection terminal extends from the inside to the outside of the coil at a height position overlapping with the small shielding piece when the coil unit is viewed from the side.

40. The coil unit according to claim 38 or 39, wherein: The coil element has a plurality of turns arranged in a radial direction. When viewed along the axial direction, at the point where the first connecting terminal intersects each turn portion, an angle formed by the first connecting terminal and the turn portion or a tangent line of the turn portion is 80° to 100°.

41. The coil unit according to any one of claims 38 to 40, wherein: When viewed along the axial direction, at the point where the first connecting terminal intersects each turn portion, the first connecting terminal is orthogonal to the turn portion or the tangent line of the turn portion.

42. The coil unit according to any one of claims 38 to 41, wherein: The coil element further includes a straight line portion group, wherein the straight line portion group is composed of a plurality of straight line portions arranged in a radial direction and extending in the same direction. When viewed along the axial direction, the first connecting terminal intersects the straight portion group.

43. The coil unit according to claim 42, wherein: When viewed along the axial direction, the angle formed by the first connecting terminal and the straight portion group is 80° to 100°.

44. The coil unit according to claim 42 or 43, wherein: When viewed along the axial direction, the first connecting terminal is orthogonal to the straight portion group.

45. The coil unit according to claim 38, wherein: The coil element further includes a curved portion group, wherein the curved portion group is composed of a plurality of curved portions arranged in a radial direction and extending parallel to each other. When viewed along the axial direction, the first connecting terminal intersects with the curved portion group.

46. ​​The coil unit according to claim 45, wherein: When viewed along the axial direction, an angle formed between the first connecting terminal and a tangent line of the curved portion group is 80° to 100°.

47. The coil unit according to claim 45 or 46, wherein: When viewed along the axial direction, the first connecting terminal is orthogonal to the tangent line of the curved portion group.

48. The coil unit according to any one of claims 38 to 47, wherein: When viewed in the axial direction, a point where the first connection terminal overlaps with the outer peripheral edge of the first shielding member is defined as a first point. When viewed in the axial direction, a point where the second connection terminal connected to the outer end portion overlaps with the outer peripheral edge of the first shielding member is defined as a second point. When viewed in the axial direction, an angle formed by a first imaginary line connecting the first point and the central axis and a second imaginary line connecting the second point and the central axis is less than or equal to 90°.

49. The coil unit according to claim 48, wherein An angle formed by the first imaginary line and the second imaginary line is less than 45°.

50. The coil unit according to any one of claims 38 to 49, wherein: When viewed in the axial direction, a point where the first connection terminal overlaps with the outer peripheral edge of the first shielding member is defined as a first point. When viewed in the axial direction, a point where the second connection terminal connected to the outer end portion overlaps with the outer peripheral edge of the first shielding member is defined as a second point. The distance between the first point and the second point is less than 100 mm.

51. The coil unit according to claim 50, wherein: The distance between the first point and the second point is less than 50 mm.

52. The coil unit according to any one of claims 38 to 51, wherein: The coil unit further includes a second connection terminal connected to the coil. When viewed along the axial direction, the second shielding component is in a quadrilateral shape, and the first connecting terminal and the second connecting terminal extend from the same side of the second shielding component.

53. The coil unit according to any one of claims 38 to 52, wherein: The coil element is wound around the central axis along a first winding direction from the outer end portion toward the inner end portion thereof, The outer end is offset from the inner end toward the first circumferential direction.

54. The coil unit according to any one of claims 38 to 53, wherein: The coil element includes: a first turn portion, the first turn portion includes the inner end portion; a second turn portion, the second turn portion is adjacent to the first turn portion in the radial direction and is arranged at a position radially outward of the first turn portion; a third turn portion, the third turn portion is adjacent to the second turn portion in the radial direction and is arranged at a position radially outward of the second turn portion; A distance between the inner end portion and the second turn portion is greater than a distance between the second turn portion and the third turn portion.

55. A coil unit, wherein: The coil unit includes a coil including a coil element formed in a spiral shape around an arbitrary central axis. When viewed along the axial direction, the coil element is in an octagonal shape as a whole.

56. The coil unit according to claim 55, wherein: The coil element includes seven straight line portions extending along seven of the eight sides of the octagon. The angle formed by the adjacent straight line portion groups is 125° to 145°.

57. The coil unit according to claim 56, wherein: The angle formed by adjacent groups of straight line portions is 135°.

58. The coil unit according to any one of claims 55 to 57, wherein: The coil element is in a regular octagonal shape as a whole.

59. A coil unit, wherein: The coil unit includes a coil including a coil element formed in a spiral shape around an arbitrary central axis. When viewed along the axial direction, the coil element is in a dodecagonal shape as a whole.

60. The coil unit according to claim 59, wherein: The coil element includes 11 straight line portions extending along 11 of the 12 sides of the dodecagon. The angle formed by the adjacent straight line portion groups is 140° to 160°.

61. The coil unit according to claim 60, wherein: The angle formed by adjacent groups of straight line portions is 150°.

62. The coil unit according to any one of claims 59 to 61, wherein: The coil element is in the shape of a regular dodecagon as a whole.

63. The coil unit according to any one of claims 55 to 62, wherein: The coil unit further includes a first shielding member. The first shielding component is divided into a plurality of shielding pieces, The first shielding member has gaps extending linearly between adjacent shielding pieces. The coil element includes a straight line portion group consisting of a plurality of straight line portions arranged in a radial direction and extending in the same direction. The gap crosses at least a portion of the set of straight sections when viewed in the axial direction.

64. The coil unit according to claim 63, wherein: When viewed in the axial direction, an angle formed by the gap and the at least a portion of the straight portion group is 80° to 100°.

65. The coil unit according to claim 63 or 64, wherein: The gap is orthogonal to the at least a portion of the straight portion group when viewed in the axial direction.

66. A power transmission device, wherein: The power transmission device includes the coil unit according to any one of claims 1 to 65.

67. A power receiving device, wherein: The power receiving device includes the coil unit according to any one of claims 1 to 65.

68. A power transmission system, wherein: The power transmission system includes a power transmission device and a power receiving device. At least one of the power transmitting device and the power receiving device includes the coil unit according to any one of claims 1 to 65.

69. A mobile body, wherein: The moving object includes the coil unit according to any one of claims 1 to 65.

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