Coil device

Abstract

The present invention provides a coil device capable of fully ensuring the mounting strength on a mounting substrate. The coil device (10) comprises: a pair of first cores (20a) and second cores (20b); a third core (20c) arranged adjacent to the first core (2a) or the second core (20b); and a pair of first coils (30) and second coils (40) arranged between any two of the adjacent first cores (20a), second cores (20b) and third cores (20c). The first coils (30) and second coils (40) have their respective plate surfaces facing each other, and a portion of each of the first coils (30) and second coils (40) is exposed on the side of the first core (20a), the second core (20b) or the third core (20c).

Description

Technical Field

[0001] The present invention relates to a coil device used as an inductor or the like. Background Art

[0002] As a coil device used as an inductor or the like, for example, a coil device described in Patent Document 1 is known. The coil device described in Patent Document 1 has a pair of a first core and a second core, and a third core arranged between the first core and the second core via a gap. A first coil is arranged between the first core and the third core, and a second coil is arranged between the second core and the third core. By forming a gap between the first core and the third core and between the second core and the third core, the magnetic coupling between the first coil and the second coil can be reduced.

[0003] However, in the coil device described in Patent Document 1, it is difficult to mount the mounting portions of the first coil and the second coil on the mounting substrate with sufficient mounting strength.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: U.S. Patent Application Publication No. 2017 / 0178794 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The present invention has been made in view of such actual conditions, and an object of the present invention is to provide a coil device capable of sufficiently ensuring mounting strength to a mounting substrate.

[0009] Technical solutions to solve problems

[0010] In order to achieve the above object, the present invention provides a coil device having:

[0011] a pair of a first core and a second core;

[0012] a third core, which is arranged adjacent to the first core or the second core;

[0013] a pair of first coils and second coils, which are respectively arranged between any two adjacent cores among the first core, the second core and the third core,

[0014] The first coil and the second coil have respective plate surfaces facing each other,

[0015] Parts of each of the first coil and the second coil are exposed on the side of the first core, the second core, or the third core.

[0016] In the coil device of the present invention, a portion of each of the first coil and the second coil is exposed on the side of the first core, the second core or the third core. Therefore, when installing the coil device, a soldering foot can be formed on the portion of the first coil exposed on the side of any core and the portion of the second coil exposed on the side of any core, and the mounting strength to the mounting substrate can be enhanced through the soldering foot. Therefore, according to the coil device of the present invention, a coil device that can fully ensure the mounting strength to the mounting substrate can be realized.

[0017] In addition, in the coil device of the present invention, the plate surfaces of the first coil and the second coil are opposite to each other. Therefore, the first coil is arranged between adjacent cores in a state where its plate surface is oriented perpendicular to the direction of the mounting substrate, and the second coil is arranged between adjacent cores in a state where its plate surface is oriented perpendicular to the direction of the mounting substrate. Therefore, the thickness of the coil device along the arrangement direction of the first core, the second core, and the third core can be reduced, and the miniaturization of the coil device can be achieved.

[0018] Preferably, the first coil has a pair of plate-shaped first lateral portions and a plate-shaped first connecting portion connecting each of the pair of the first lateral portions, and the second coil has a pair of plate-shaped second lateral portions and a plate-shaped second connecting portion connecting each of the pair of the second lateral portions. By setting it as such a structure, the first coil and the second coil can be easily arranged between adjacent cores, and the manufacture of the coil device is easy. In addition, by forming the first coil and the second coil by a plate shape, the thickness of the coil device along the arrangement direction of the first core, the second core and the third core can be reduced, and the miniaturization of the coil device can be effectively achieved. In addition, compared with the case where the first coil and the second coil are formed by a conductive wire, a large current can flow through the first coil and the second coil.

[0019] Preferably, the first connection portion and the second connection portion are respectively arranged between any two of the adjacent first cores, the second cores and the third cores. By setting such a structure, the plate surfaces of the first connection portion and the second connection portion are arranged opposite to each other. Therefore, the thickness of the coil device along the arrangement direction of the first core, the second core and the third core can be reduced, and the miniaturization of the coil device can be effectively achieved.

[0020] Preferably, the first side portion and the second side portion are respectively opposite to the side of any one of the first core, the second core and the third core. By setting such a structure, the first side portion and the second side portion can be exposed to a large extent on the side of any one of the first core, the second core and the third core. Therefore, solder feet can be fully formed on the first side portion and the second side portion, and the mounting strength on the mounting substrate can be effectively enhanced through the solder feet.

[0021] Preferably, the first lateral portion and the second lateral portion are respectively opposite to the lateral sides of any two cores among the first core, the second core and the third core. By setting such a structure, when manufacturing the coil device, when combining each coil and each core, the lateral sides of the above-mentioned any two cores can be fixed by the first lateral portion, and the lateral sides of the above-mentioned any two cores can be fixed by the second lateral portion. Therefore, the first lateral portion and the second lateral portion can prevent the misalignment of each core.

[0022] Preferably, the first side portion and the second side portion extend from the side surface of any one of the first core, the second core and the third core to the bottom surface, respectively. By setting such a structure, a part of the first side portion extending from the bottom surface of any one of the cores can be connected to the mounting substrate as a mounting surface, and a part of the second side portion extending from the bottom surface of any one of the cores can be connected to the mounting substrate as a mounting surface.

[0023] Preferably, the first side portion and the second side portion extend from the side of any one of the first core, the second core and the third core to the upper surface, respectively. By setting such a structure, a mounting surface can be formed not only on the bottom surface side of the coil device, but also on the upper surface side. Therefore, when installing the coil device, even when the upper and lower parts (upper surface side and bottom surface side) of the coil device are reversed, installation on the mounting substrate can be achieved, and the installation of the coil device is easy.

[0024] Preferably, the first side portion and the second side portion extend from the side of any one of the first core, the second core and the third core to the end face. By setting such a structure, a solder foot can be formed on a part of the first side portion located on the end face side of any one of the cores, and a solder foot can be formed on a part of the second side portion located on the end face side of any one of the cores, and the mounting strength to the mounting substrate can be enhanced through the solder foot.

[0025] Preferably, the first core, the second core and the third core are formed to be long in a direction perpendicular to the substrate surface of the mounting substrate. By setting such a structure, the lateral width of the coil device can be reduced relative to the height, and a plurality of coil devices can be mounted on the mounting substrate at a high density.

[0026] Preferably, a first recess through which the first coil passes is formed on the first core, and a second recess through which the second coil passes is formed on the second core, and the first recess or the second recess is formed offset on the bottom surface side or the top surface side of the first core or the second core. By setting such a structure, the magnetic circuit of the first coil or the second coil can be changed, and the magnetic characteristics of the coil device can be adjusted.

[0027] Preferably, there are n cores corresponding to the first core or the second core. By adding n first cores or second cores and correspondingly adding n coils corresponding to the first coil or the second coil, a coil device with a high inductance value can be realized, for example. In addition, by configuring the coils to be clamped between the cores, the coil device can be made compact (space-saving) even when the number of cores and coils increases.

[0028] Preferably, any one of the first core, the second core, and the third core is composed of a split core. With such a structure, when the split cores are combined, gaps can be formed between the split cores, and the magnetic coupling between the first coil and the second coil can be adjusted.

[0029] Preferably, the first core and the second core are each made of a magnetic body, and the third core is made of a non-magnetic body. Thus, by making only the third core of a non-magnetic body, for example, the inductance value of the coil device can be adjusted to a desired value.

[0030] Preferably, the third core is arranged between the first core and the second core, the first coil is arranged between the first core and the third core, the second coil is arranged between the second core and the third core, the first coil and the second coil are arranged between the plate surfaces of the third core, a part of the first coil is exposed to the side of the first core, and a part of the second coil is exposed to the side of the second core. By setting such a structure, a coil device having symmetry with the third core as the center can be obtained, and a coil device having good magnetic properties can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1A It is a perspective view of the coil device according to the first embodiment of the present invention.

[0032] Figure 1B yes Figure 1A Bottom view of the coil arrangement shown.

[0033] Figure 1C Yes means Figure 1A A perspective view of a modified example of the coil device shown.

[0034] Figure 2 yes Figure 1A An exploded perspective view of the coil device shown.

[0035] Figure 3A It is a perspective view of a coil device according to a second embodiment of the present invention.

[0036] Figure 3B Yes means Figure 3A A perspective view of a modified example of the coil device shown.

[0037] Figure 4 yes Figure 3A An exploded perspective view of the coil device shown.

[0038] Figure 5A It is a perspective view of a coil device according to a third embodiment of the present invention.

[0039] Figure 5B Yes means Figure 5A A perspective view of a modified example of the coil device shown.

[0040] Figure 6 yes Figure 5A An exploded perspective view of the coil device shown.

[0041] Figure 7 It is a perspective view of a coil device according to a fourth embodiment of the present invention.

[0042] Figure 8 yes Figure 7 An exploded perspective view of the coil device shown.

[0043] Fig. 9 It is a perspective view of a coil device according to a fifth embodiment of the present invention.

[0044] Fig.10 yes Fig. 9 An exploded perspective view of the coil of the coil arrangement shown.

[0045] Fig.11 It is a perspective view of a coil device according to a sixth embodiment of the present invention.

[0046] Fig.12 It is a perspective view of a coil device according to a seventh embodiment of the present invention.

[0047] Fig.13 It is a perspective view of a coil device according to an eighth embodiment of the present invention. DETAILED DESCRIPTION

[0048] Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

[0049] First embodiment

[0050] like Figure 1AAs shown, the coil device 10 includes: a core 20, which has a generally rectangular outer shape as a whole; a pair of first coils 30 and second coils 40, at least a portion of which is arranged inside the core 20. The coil device 10 is, for example, an inductor, and is composed of an array structure in which the coils 30 and 40 are arranged along the X-axis direction together with the cores 20a, 20b, and 20c described later. The size of the coil device 10 is not particularly limited, but the length along the directions of the axes, for example, the X-axis, the Y-axis, and the Z-axis can be appropriately determined within the range of 3 to 20 mm.

[0051] The core 20 is composed of a pair of first cores 20a and second cores 20b and a third core 20c arranged adjacent to the first cores 20a and second cores 20b in the X-axis direction. The core 20 is made of a magnetic body, for example, by molding and sintering a magnetic powder made of a magnetic material with a high magnetic permeability, such as Ni-Zn ferrite or Mn-Zn ferrite, or a metal magnetic body. In addition, the core 20c may be made of a non-magnetic body, or may be a powder compact containing magnetic powder in a resin. In addition, the magnetic permeabilities of the cores 20a, 20b, and 20c may be different.

[0052] The first core 20a and the second core 20b have shapes corresponding to each other (symmetrical), and in the example shown in the figure, the shape of the first core 20a and the shape of the second core 20b are the same shape. Figure 2 As shown, the core 20a, 20b has a substantially rectangular parallelepiped shape that is long in the Z-axis direction (the height direction of the coil device 10 or the direction perpendicular to the substrate surface of the mounting substrate), and is composed of a C-shaped or U-shaped core. The core 20a, 20b has a first outer leg portion 21, a second outer leg portion 22 and a recessed portion 23.

[0053] The first outer leg 21 is formed at the upper end of the cores 20a and 20b in the Z-axis direction, and the second outer leg 22 is formed at the lower end of the cores 20a and 20b in the Z-axis direction. The length Z1 of the first outer leg 21 in the Z-axis direction and the length Z2 of the second outer leg 22 in the Z-axis direction are equal, but Z2>Z1 may be satisfied. In this case, the recess 23 may be formed offset on the upper surface side of the cores 20a and 20b, which can effectively prevent the magnetic saturation of the coil device 10. In addition, Z2<Z1 may be satisfied. In this case, since the recess 23 may be formed offset on the bottom surface side of the cores 20a and 20b, the length of the coil 30 (particularly, the length along the Z-axis direction of the first side portions 31a and 31b described later) is shortened, and the DC resistance of the coil 30 can be reduced by the amount of shortening. The outer leg portions 21 and 22 of the first core 20 a protrude to one side in the X-axis direction, and the outer leg portions 21 and 22 of the second core 20 b protrude to the other side in the X-axis direction.

[0054] The recess 23 is formed between the first outer leg 21 and the second outer leg 22. The Z-axis width of the recess 23 is substantially equal to or greater than the Z-axis width of the connecting portions 34 and 44 of the coils 30 and 40 described later. The X-axis depth of the recess 23 is substantially equal to or greater than the thickness (plate thickness) of the coils 30 and 40 described later. Figure 1A and Figure 2 As shown, the ratio W2 / W1 of the width W2 of the third core 20c in the X-axis direction and the width W1 of the first core 20a in the X-axis direction at the position of the recess 23 is preferably 0.5 to 1, and more preferably 1. The cross-sectional area of ​​the first core 20a when cut by a plane perpendicular to the Z-axis at the position of the recess 23 is smaller than the cross-sectional area of ​​the first core 20a when cut by a plane perpendicular to the Z-axis at the position of the other parts.

[0055] The first core 20a and the third core 20c are combined by bonding at least one of the outer legs 21, 22 of the first core 20a to the end face (surface) on the other side of the X-axis direction of the third core 20c using a bonding material such as an adhesive. In addition, the second core 20b and the third core 20c are combined by bonding at least one of the outer legs 21, 22 of the second core 20b to the end face on one side of the X-axis direction of the third core 420c using a bonding material such as an adhesive.

[0056] By using, for example, a resin containing Micropal (Sekisui Chemical Co., Ltd.) or resin beads as an adhesive, a first gap portion 51 (see FIG. 1 ) described later can be easily formed between the first core 20 a and the third core 20 c. Figure 1A ), and the second gap portion 52 described later can be easily formed between the second core 20b and the third core 20c (see Figure 1A ).

[0057] In the state where the cores 20a, 20b, and 20c are combined, the first gap 51 is formed along the Z-axis direction between the outer leg portions 21, 22 of the first core 20a and the end surface of the third core 20c, and the second gap 52 is formed along the Z-axis direction between the outer leg portions 21, 22 of the second core 20b and the end surface of the third core 20c. The X-axis direction width G1 of the first gap 51 and the X-axis direction width G2 of the second gap 52 are preferably 0.03 to 0.3 mm. In addition, the values ​​of the width G1 and the width G2 may be different.

[0058] A first gap 51 is formed between the first core 20 a and the third core 20 c , and a second gap 52 is formed between the second core 20 b and the third core 20 c , thereby effectively preventing magnetic coupling between the first coil 30 and the second coil 40 .

[0059] like Figure 2 As shown, the recess 23 is formed at the approximate center of the cores 20a and 20b in the Z-axis direction. The recess 23 of the first core 20a can be inserted through (through) the connection portion 34 of the first coil 30, and the recess 23 of the second core 20b can be inserted through (through) the connection portion 44 of the second coil 40.

[0060] The third core 20c has a rectangular parallelepiped shape that is long in the Z-axis direction and is composed of an I-shaped (flat-plate-shaped) core. The third core 20c is configured to be sandwiched between the first core 20a and the second core 20b along the X-axis direction. The second coil 40 is configured on one side of the X-axis direction with the third core 20c sandwiched therebetween, and the second core 20b is also configured on its outer side, and the first coil 30 is configured on the other side of the X-axis direction, and the first core 20a is also configured on its outer side.

[0061] The first coil 30 and the second coil 40 have corresponding (symmetrical) shapes, and in the example shown in the figure, the first coil 30 and the second coil 40 are the same shape. The second coil 40 is a component arranged in a direction in which the first coil 30 is rotated 180 degrees with the Z axis as the center axis.

[0062] As the material of the coils 30 and 40, good conductors of metals such as copper and copper alloys, silver, and nickel can be cited, but as long as it is a conductive material, there is no particular limitation. The coils 30 and 40 are formed by, for example, machining a metal plate (conductor plate). Among them, the method of forming the coils 30 and 40 is not limited to this. In the example shown in the figure, the coils 30 and 40 have a roughly U-shape as a whole, and the lateral width of the coils 30 and 40 in the Y-axis direction is greater than the length of the coils 30 and 40 in the X-axis direction and less than the height of the coils 30 and 40 in the Z-axis direction. That is, the coils 30 and 40 have a shape that is long in the Z-axis direction.

[0063] At least a portion of the first coil 30 is disposed between the adjacent first core 20a and the third core 20c, and at least a portion of the second coil 40 is disposed between the adjacent second core 20b and the third core 20c. The first coil 30 has a pair of first side portions 31a, 31b, a pair of first recessed portions 33a, 33b, and a first connecting portion 34.

[0064] The first side portions 31a, 31b are composed of a plate (flat plate shape) parallel to the XZ plane, and have a shape that is long in the Z-axis direction. The first side portions 31a, 31b extend from the position of the first connecting portion 34 toward the bottom of the Z-axis direction. The first side portion 31a and the first side portion 31b are opposite to each other with a predetermined interval in the Y-axis direction. The interval between the first side portion 31a and the first side portion 31b is approximately equal to the width of the core 20 in the Y-axis direction, or is larger than the width of the core 20 in the Y-axis direction. A gap may be formed between the first side portions 31a, 31b and the side surface of the core 20 (the side surface in the Y-axis direction), or the side surface of the core 20 may be clamped by the first side portions 31a, 31b.

[0065] The first lateral portions 31a, 31b have first mounting portions 32a, 32b and first lateral protrusions 35a, 35b. The first lateral protrusions 35a, 35b are formed of a plate (flat plate shape) parallel to the XZ plane, and extend from the approximate center of the first lateral portions 31a, 31b in the Z-axis direction to the lower end along the Z-axis direction. In addition, the first lateral protrusions 35a, 35b protrude from the first connecting portion 34 to the far side (one side in the X-axis direction) along the X-axis direction. In addition, the first lateral protrusions 35a, 35b correspond to the portions protruding from the bottom (bottom surface) of the first recesses 33a, 33b to one side in the X-axis direction described later. The portion of the first lateral portions 31a, 31b other than the first lateral protrusions 35a, 35b is the main body of the first lateral portions 31a, 31b.

[0066] like Figure 1A As shown, the first lateral protrusions 35a, 35b (wherein the illustration of the first lateral protrusions 35a is omitted) are configured to span the side surfaces of the cores 20a, 20c in the X-axis direction at the lower end portions of the first core 20a and the third core 20c in the Z-axis direction. That is, at the lower end portions, at least a portion of the side surfaces of the cores 20a, 20c are covered by the first lateral protrusions 35a, 35b.

[0067] A gap is formed between the end of the first lateral portion 31a, 31b on the other side (positive direction) in the X-axis direction and the end face of the first core 20a on the other side in the X-axis direction. That is, the first lateral portion 31a, 31b does not extend to the end face of the first core 20a on the other side in the X-axis direction, but only extends from the end face to the inner position.

[0068] In the present embodiment, a portion of the first coil 30 (the first lateral portions 31a, 31b) is exposed (configured) on the side (outside) of the first core 20a and the third core 20c in the Y-axis direction. In addition, the first lateral portions 31a, 31b (including the first lateral protrusions 35a, 35b) are opposite to the side surfaces of the first core 20a and the third core 20c. As a result, the first core 20a and the third core 20c are configured to be clamped in the Y-axis direction by the first lateral portions 31a, 31b (including the first lateral protrusions 35a, 35b) exposed on the side surfaces in the Y-axis direction.

[0069] like Figure 2 As shown, the first mounting portions 32a, 32b are formed of a plate (flat plate shape) parallel to the XY plane and have a shape that is long in the X-axis direction (the length direction of the coil device 10). The first mounting portions 32a, 32b are formed by, for example, bending the first side portions 31a, 31b from the Z-axis direction toward the Y-axis direction at a substantially right angle. Figure 1A As shown, a gap is formed in the Z-axis direction between the first mounting portions 32a, 32b and the core 20. In this embodiment, the first side portions 31a, 31b extend from the side surfaces of the first core 20a and the third core 20c to the bottom surface via the first mounting portions 32a, 32b.

[0070] like Figure 1B As shown, the first mounting portions 32a and 32b extend toward each other inward in the Y-axis direction on the bottom surface side of the core 20. In addition, the first mounting portions 32a and 32b are arranged across the bottom surfaces of the cores 20a and 20c in the X-axis direction.

[0071] A gap is formed between the end of the first mounting portion 32a, 32b on the positive side in the X-axis direction and the end face of the first core 20a on the positive side in the X-axis direction. That is, the first mounting portions 32a, 32b do not extend to the end face of the first core 20a on the positive side in the X-axis direction, but only extend to a position closer to the inside than the end face.

[0072] The first mounting portions 32a and 32b are connected to the land pattern of the mounting substrate by a bonding material such as solder or a conductive adhesive, and the coil device 10 can be connected to the mounting substrate via the first mounting portions 32a and 32b. At this time, solder fillets can be formed on the outer surfaces of the first side portions 31a and 31b in the Y-axis direction.

[0073] like Figure 2As shown, the first connection portion 34 is composed of a plate-like shape (flat plate shape) parallel to the YZ plane, and has a shape that is long in the Y-axis direction (the width direction of the coil device 10). The first connection portion 34 is arranged in a direction opposite to the surface (flat plate surface) of the first core 20a and the third core 20c. The first connection portion 34 is located near the upper end of one side of the X-axis direction of each of the first lateral portions 31a and 31b, connecting each of a pair of first lateral portions 31a and 31b. The first connection portion 34 and a pair of first lateral portions 31a and 31b intersect at approximately right angles. The first connection portion 34 is arranged between each of the adjacent first core 20a and the third core 20c.

[0074] The first concave portion 33a, 33b is formed at the approximate center of the first side portion 31a, 31b in the X-axis direction at one end side of the first side portion 31a, 31b in the X-axis direction. The first concave portion 33a, 33b has a shape that is concave toward the other side in the X-axis direction, and the width of the first side portion 31a, 31b in the X-axis direction is partially reduced by the first concave portion 33a, 33b. Figure 1A As shown, the side surface of the first core 20a in the Y-axis direction is partially exposed at the position where the first recessed portions 33a and 33b are formed (however, the first recessed portion 33a is omitted from illustration).

[0075] like Figure 2 As shown, the second coil 40 has a pair of plate-shaped second side portions 41a, 41b, a pair of second recessed portions 43a, 43b, and a plate-shaped second connecting portion 44 connecting each of the pair of second side portions 41a, 41b. The second side portions 41a, 41b have second side protrusions 45a, 45b and second mounting portions 42a, 42b. Since the structures of the above-mentioned parts of the second coil 40 are the same as the structures of the above-mentioned parts of the first coil 30, detailed description of the repeated parts is omitted.

[0076] like Figure 1A As shown, the second lateral protrusions 45a, 45b (wherein the illustration of the second lateral protrusions 45b is omitted) are configured to span the side surfaces of the cores 20b, 20c in the X-axis direction at the lower end portions of the second core 20b and the third core 20c in the Z-axis direction. That is, at least a portion of the side surfaces of the cores 20b, 20c at their lower ends are covered by the second lateral protrusions 45a, 45b.

[0077] Although not shown in detail, a gap is formed between the end of the second side portions 41a, 41b on one side (negative direction) in the X-axis direction and the end face of the second core 20b on one side in the X-axis direction. That is, the second side portions 41a, 41b do not extend to the end face of the second core 20b on one side in the X-axis direction, but only extend to a position closer to the inside than the end face.

[0078] In the present embodiment, a portion of the second coil 40 (the second lateral portions 41a, 41b) is exposed (configured) on the side (outside) of the second core 20b and the third core 20c in the Y-axis direction. In addition, the second lateral portions 41a, 41b (including the second lateral protrusions 45a, 45b) are opposite to the side of the second core 20b and the third core 20c. As a result, the second core 20b and the third core 20c are configured to be clamped in the Y-axis direction by the second lateral portions 41a, 41b (including the second lateral protrusions 45a, 45b) exposed on the side of the Y-axis direction.

[0079] like Figure 1B As shown, the second mounting portions 42a, 42b are configured to span the bottom surfaces of the cores 20b, 20c in the X-axis direction. A gap is formed between the ends of the second mounting portions 42a, 42b on the negative side in the X-axis direction and the end surface of the second core 20b on the negative side in the X-axis direction. That is, the second mounting portions 42a, 42b do not extend to the end surface of the second core 20b on the negative side in the X-axis direction, but only extend to a position closer to the inside than the end surface.

[0080] like Figure 1A As shown, in this embodiment, the second side portions 41a, 41b extend from the side surfaces of the second core 20b and the third core 20c to the bottom surface via the second mounting portions 42a, 42b. The second connecting portion 44 is disposed between each of the adjacent second cores 20b and the third core 20c, and is disposed in a direction opposite to the respective surfaces (flat surfaces) of the second core 20b and the third core 20c.

[0081] The first core 30 and the second coil 40 are disposed opposite to each other in the X-axis direction. Figure 2 As shown, the first connection portion 34 of the first coil 30 is opposite to the second connection portion 44 of the second coil 40 in the X-axis direction with the third core 20c sandwiched therebetween. The first connection portion 34 is arranged between the adjacent first core 20a and the third core 20c, and the second connection portion 44 is arranged between the adjacent second core 20b and the third core 20c. Figure 1A and Figure 2 As shown, the interval between the first connection portion 34 and the second connection portion 44 along the X-axis direction is substantially equal to or greater than the length of the third core 20 c in the X-axis direction.

[0082] like Figure 1A As shown, the first lateral protrusion 35b (35a) and the second lateral protrusion 45a (45b) are arranged with a gap in the X-axis direction. The ratio W3 / W2 of the interval W3 in the X-axis direction between the first lateral protrusion 35b (35a) and the second lateral protrusion 45a (45b) to the X-axis width W2 of the third core 20c is preferably 0.1 to 0.8, and more preferably 0.3 to 0.5.

[0083] In the manufacture of the coil device 10, the Figure 1A The cores 20a, 20b, 20c, the first coil 30 and the second coil 40 are shown. Next, the coils 30 and 40 are arranged inside and the cores 20a, 20b and 20c are combined at the same time. Figure 2 As shown, the first coil 30 is clamped by the first core 20a and the third core 20c so that the first connection portion 34 is inserted into the inside of the recess 23 of the first core 20a. In addition, the second coil 40 is clamped by the second core 20b and the third core 20c so that the second connection portion 44 is inserted into the inside of the recess 23 of the second core 20b. In addition, the cores 20a, 20b, and 20c can also be fixed to the coils 30 and 40 by adhesives or the like.

[0084] Next, the first outer leg portion 21 and / or the second outer leg portion 22 of the first core 20a is bonded to the flat surface of the other side of the X-axis direction of the third core 20c by an adhesive or the like, and the first outer leg portion 21 and / or the second outer leg portion 22 of the second core 20b is bonded to the flat surface of one side of the X-axis direction of the third core 20c by an adhesive or the like, thereby obtaining Figure 1A The coil arrangement 10 is shown.

[0085] In the coil device 10 of the present embodiment, a portion of the first coil 30 (the first lateral portion 31a, 31b) is exposed on the side of the core 20a, 20c, and a portion of the second coil 40 (the second lateral portion 41a, 41b) is exposed on the side of the core 20b, 20c. Therefore, when the coil device 10 is installed, a solder foot can be formed on the first lateral portion 31a, 31b exposed on the side of the core 20a, 20c, and the second lateral portion 41a, 41b exposed on the side of the core 20b, 20c, and the solder foot can be used to strengthen the mounting strength to the mounting substrate. Therefore, according to the coil device 10 of the present embodiment, it is possible to realize a coil device 10 that can fully ensure the mounting strength to the mounting substrate.

[0086] In addition, in the coil device 10 of the present embodiment, the plate surfaces of the first coil 30 (first connecting portion 34) and the second coil 40 (second connecting portion 44) are opposite to each other. Therefore, the first coil 30 is arranged between the adjacent cores 20a and 20c with its plate surface facing the direction perpendicular to the mounting substrate, and the second coil 40 is arranged between the adjacent cores 20b and 20c with its plate surface facing the direction perpendicular to the mounting substrate. Therefore, the thickness of the coil device 10 along the arrangement direction of the first core 20a, the second core 20b and the third core 20c can be reduced, and the miniaturization of the coil device 10 can be achieved.

[0087] In addition, in the present embodiment, the first coil 30 has a pair of first side portions 31a, 31b and a first connecting portion 34, and the second coil 40 has a pair of second side portions 41a, 41b and a second connecting portion 44. Therefore, the first coil 30 can be easily arranged between the adjacent cores 20a, 20c, and the second coil 40 can be easily arranged between the adjacent cores 20b, 20c, and the manufacture of the coil device 10 is easy. In addition, by forming the first coil 30 and the second coil 40 in a plate shape, the thickness of the coil device 10 along the arrangement direction of the first core 20a, the second core 20b and the third core 20c can be reduced, and the miniaturization of the coil device 10 can be effectively achieved. In addition, compared with the case where the first coil 30 and the second coil 40 are formed of a conductive wire, a large current can flow through the first coil 30 and the second coil 40.

[0088] In addition, in the present embodiment, the first connection portion 34 is disposed between each of the adjacent first core 20a and the third core 20c, and the second connection portion 44 is disposed between each of the adjacent second core 20b and the third core 20c. Therefore, the plate surfaces of the first connection portion 34 and the second connection portion 44 are disposed opposite to each other. As a result, the thickness of the coil device 10 along the arrangement direction of the first core 20a, the second core 20b, and the third core 20c can be reduced, and the miniaturization of the coil device 10 can be effectively achieved.

[0089] In addition, in the present embodiment, the first side portions 31a, 31b are opposite to the side of the first core 20a and the third core 20c, and the second side portions 41a, 41b are opposite to the side of the second core 20b and the third core 20c. Therefore, the first side portions 31a, 31b can be exposed to a large extent on the side of the first core 20a and the third core 20c, and the second side portions 41a, 41b can be exposed to a large extent on the side of the second core 20b and the third core 20c. Therefore, solder feet can be fully formed on the first side portions 31a, 31b and the second side portions 41a, 41b, and the mounting strength of the mounting substrate can be effectively enhanced through the solder feet.

[0090] In addition, when manufacturing the coil device 10, when combining the coils 30, 40 and the cores 20a, 20b, 20c, the first side portions 31a, 31b can be used to fix the sides of the cores 20a, 20c, and the second side portions 41a, 41b can be used to fix the sides of the cores 20b, 20c. Therefore, the first side portions 31a, 31b and the second side portions 41a, 41b can prevent the cores 20a, 20b, 20c from being misaligned.

[0091] In addition, in the present embodiment, the first side portions 31a and 31b extend from the side surfaces of the first core 20a and the third core 20c to the bottom surface, and the second side portions 41a and 41b extend from the side surfaces of the second core 20b and the third core 20c to the bottom surface. Therefore, a portion of the first side portions 31a and 31b (mounting portions 32a and 32b) extending from the bottom surface of the cores 20a and 20b can be connected to the mounting substrate as a mounting surface, and a portion of the second side portions 41a and 41b (mounting portions 42a and 42b) extending from the bottom surface of the cores 20b and 20c can be connected to the mounting substrate as a mounting surface.

[0092] In addition, in the present embodiment, the first core 20a, the second core 20b and the third core 20c are formed to be long in a direction perpendicular to the substrate surface of the mounting substrate. Therefore, the lateral width of the coil device 10 can be reduced relative to the height, and a plurality of coil devices 10 can be mounted on the mounting substrate at a high density.

[0093] In addition, in the present embodiment, the third core 20c is arranged between the first core 20a and the second core 20b, the first coil 30 is arranged between the first core 20a and the third core 20c, the second coil 40 is arranged between the second core 20b and the third core 20c, the plate surfaces of the first coil 30 (connection portion 34) and the second coil 40 (connection portion 44) are opposite to each other with the third core 20c sandwiched therebetween, a part of the first coil 30 (first side portions 31a, 31b) is exposed to the side of the first core 20a, and a part of the second coil 40 (second side portions 41a, 41b) is exposed to the side of the second core 20b. Therefore, a coil device 10 having symmetry with the third core 20c as the center can be obtained, and a coil device 10 having good magnetic characteristics can be realized.

[0094] Second embodiment

[0095] The coil device 110 of the second embodiment of the present invention is different from the first embodiment described above only in the following points, and the other structures are the same as the first embodiment described above, and the same effects are exerted, and the description of the repeated parts is omitted. In addition, in the drawings, the common symbols are marked for the common components with the first embodiment.

[0096] like Figure 3A As shown, the coil device 110 has a first coil 130 and a second coil 140. Figure 4 As shown, the first coil 130 has first side portions 131a and 131b, and the first side portions 131a and 131b have first side protrusions 135a and 135b and first mounting portions 132a and 132b.

[0097] right Figure 4 and Figure 2As can be seen from the comparison, the first lateral protrusions 135 a and 135 b are different from the first lateral protrusions 35 a and 35 b of the first embodiment in that the protrusion length toward one side in the X-axis direction is reduced.

[0098] In more detail, Figure 4 The protrusion length of the first side protrusions 135a, 135b from the bottom surface of the first recesses 33a, 33b is approximately Figure 2 The first lateral protrusions 35a and 35b shown protrude half the length from the bottom surface of the first recessed portions 33a and 33b, and the first lateral protrusions 135a and 135b protrude toward one side in the X-axis direction to substantially the same position as the connecting portion 34.

[0099] Therefore, in this embodiment, if Figure 3A and Figure 4 As shown, the first lateral protrusions 135a, 135b are not arranged to cross the side surfaces of the cores 20a, 20c at the lower ends of the first core 20a and the third core 20c in the Z-axis direction, but are only arranged on the side surfaces of the first core 20a. The positions of the ends of the first lateral protrusions 135a, 135b on one side of the X-axis direction (the negative side of the X-axis direction) are substantially equal to the positions of the ends of the second outer leg 22 on one side of the X-axis direction.

[0100] The first mounting portions 132a and 132b are different from the first mounting portions 32a and 32b of the first embodiment in that the length in the X-axis direction is shortened. As described above, in the present embodiment, the protruding length of the first lateral protrusions 135a and 135b to one side in the X-axis direction is reduced, thereby reducing the length of the first lateral portions 131a and 131b in the X-axis direction. Therefore, the length of the first mounting portions 132a and 132b in the X-axis direction is reduced by the amount of reduction in the length of the first lateral portions 131a and 131b in the X-axis direction compared to the length of the first mounting portions 32a and 32b in the X-axis direction of the first embodiment.

[0101] The second coil 140 has second side portions 141a and 141b, and the second side portions 141a and 141b have second side protrusions 145a and 145b and second mounting portions 142a and 142b. Since the structures of the above-mentioned parts of the second side portions 141a and 141b are the same as the structures of the above-mentioned parts of the first side portions 131a and 131b, detailed description of the repeated parts is omitted.

[0102] like Figure 3A and Figure 4As shown, the second lateral protrusions 145a, 145b are not arranged to cross the side surfaces of the cores 20b, 20c at the lower ends of the second core 20b and the third core 20c in the Z-axis direction, but are only arranged on the side surface of the second core 20b. The positions of the ends of the second lateral protrusions 145a, 145b on the other side of the X-axis direction (the positive direction of the X-axis) are approximately equal to the positions of the ends of the second outer leg 22 on the other side of the X-axis direction.

[0103] In this embodiment, the same effect as in the first embodiment can be obtained. In addition, in this embodiment, the protrusion lengths of the first lateral protrusions 135a, 135b and the second lateral protrusions 145a, 145b in the respective X-axis directions are shorter. Therefore, the interval between the first lateral protrusion 135b (135a) and the second lateral protrusion 145a (145b) in the X-axis direction becomes larger, which can prevent a short circuit between them.

[0104] Third embodiment

[0105] The coil device 210 of the third embodiment of the present invention is different from the second embodiment described above only in the following points, and the other structures are the same as the second embodiment described above, and the same effects are exerted, and the description of the repeated parts is omitted. In addition, in the drawings, the common symbols are marked for the common parts with the second embodiment.

[0106] like Figure 5A As shown, the coil device 210 has a first coil 230 and a second coil 240. Figure 6 As shown, the first coil 230 has first side portions 231a and 231b, and the first side portions 231a and 231b have first mounting portions 232a and 232b.

[0107] right Figure 6 and Figure 4 By comparison, we can see that Figure 6 The first side portions 231a and 231b are omitted. Figure 4 The first lateral protrusions 135a and 135b shown in the figure do not have a structure corresponding to the first lateral protrusions 135a and 135b. In addition, by omitting the first lateral protrusions 135a and 135b, the Figure 4 The first recesses 33a, 33b are shown.

[0108] Therefore, in this embodiment, if Figure 5A and Figure 6As shown, the first lateral portions 235a and 235b extend only at the lower end portion of the first core 20a in the Z-axis direction to the inner side than the end portion of the second outer leg portion 22 on one side in the X-axis direction (the negative side in the X-axis direction). The position of the end portion of the first lateral portions 231a and 231b on one side in the X-axis direction is substantially equal to the position of the bottom surface of the recessed portion 23 of the first core 20a, or is located on the other side in the X-axis direction.

[0109] like Figure 6 As shown, the first mounting portions 232a and 232b are different from the first mounting portions 132a and 132b of the second embodiment in that the length in the X-axis direction is further reduced. As described above, in the present embodiment, the first lateral protrusions 135a and 135b are omitted, so that the length in the X-axis direction of the first lateral portions 231a and 231b is reduced. Therefore, the length in the X-axis direction of the first mounting portions 232a and 232b is reduced by the amount of reduction in the length in the X-axis direction of the first lateral portions 231a and 231b compared to the length in the X-axis direction of the first mounting portions 132a and 132b of the second embodiment.

[0110] The second coil 240 has second side portions 241a and 241b, and the second side portions 241a and 241b have second mounting portions 242a and 242b. Since the structures of the above-mentioned parts of the second side portions 241a and 241b are the same as the structures of the above-mentioned parts of the first side portions 231a and 231b, detailed description of the repeated parts is omitted.

[0111] like Figure 5A and Figure 6 As shown, the second side portions 245a and 245b extend only at the lower end portion of the second core 20b in the Z-axis direction to the inner side than the end portion of the second outer leg portion 22 on the other side in the X-axis direction (the positive direction side of the X-axis). The position of the end portion of the second side portions 241a and 241b on the other side in the X-axis direction is substantially equal to the position of the bottom surface of the recessed portion 23 of the second core 20b, or is located on one side in the X-axis direction.

[0112] In this embodiment, the same effect as in the second embodiment can be obtained. Figure 4 The first lateral protrusions 135a, 135b and the second lateral protrusions 145a, 145b shown in the figure can effectively prevent the occurrence of short circuit failure compared to the coil device 110 of the second embodiment.

[0113] Fourth embodiment

[0114] The coil device 310 of the fourth embodiment of the present invention is different from the third embodiment described above only in the following points, and the other structures are the same as the third embodiment described above, and the same functions and effects are exerted, and the description of the repeated parts is omitted. In addition, in the drawings, the common symbols are marked for the common parts with the third embodiment.

[0115] like Figure 7 As shown, the coil device 310 has a first coil 330 and a second coil 340. Figure 8 As shown, the first coil 330 has first side portions 331a, 331b, and the second coil 340 has second side portions 341a, 341b. Since the structures of the second side portions 341a, 341b are the same as those of the first side portions 331a, 331b, detailed description of the overlapped parts will be omitted.

[0116] right Figure 8 and Figure 6 As can be seen from the comparison, the first side portions 331 a and 331 b are different from the first side portions 231 a and 231 b of the third embodiment in that they extend not only downward in the Z-axis direction but also upward in the Z-axis direction.

[0117] The first side portions 331a and 331b have the same shape as the portion located below the connection portion 34 in the Z-axis direction and the portion located above the Z-axis direction. Fig. 9 The state shown can be reversed upside down to obtain the same shape.

[0118] In addition, the first side portions 331a and 331b, the portion located below the Z-axis direction with the connection portion 34 sandwiched therebetween and the portion located above the Z-axis direction have the same function. Therefore, a solder fillet can be formed in the portion located above the Z-axis direction with the connection portion 34 sandwiched therebetween in the first side portions 331a and 331b. In addition, the first mounting portions 232a and 232b formed in the same portion function as a connection surface with the mounting substrate, and the coil device 310 can be connected to the mounting substrate via the first mounting portions 232a and 232b formed in the same portion.

[0119] In this embodiment, the same effect as in the third embodiment can be obtained. Moreover, in this embodiment, the first side portions 331a, 331b extend from the side of the first core 20a to the upper surface, and the second side portions 341a, 341b extend from the side of the second core 20b to the upper surface. Therefore, not only can a mounting surface be formed on the bottom surface side of the coil device 310, but also a mounting surface can be formed on the upper surface side. Therefore, when installing the coil device 310, even when the upper and lower parts (upper surface side and bottom surface side) of the coil device 310 are reversed, it is possible to install it on the mounting substrate, making it easy to install the coil device 310.

[0120] Fifth embodiment

[0121] The coil device 410 of the fifth embodiment of the present invention is different from the third embodiment described above only in the following points, and the other structures are the same as the third embodiment described above, and the same effects are exerted, and the description of the repeated parts is omitted. In addition, in the drawings, the common symbols are marked for the common parts with the third embodiment.

[0122] like Fig. 9 As shown, the coil device 410 has a first coil 430 and a second coil 440. Fig.10 As shown, the first coil 430 has first side portions 431a, 431b, and the second coil 440 has second side portions 441a, 441b. Since the structures of the second side portions 441a, 441b are the same as those of the first side portions 431a, 431b, detailed description of the overlapped parts will be omitted.

[0123] right Fig.10 and Figure 6 By comparison, it can be seen that the first side portions 431a, 431b are different from the first side portions 231a, 231b of the third embodiment in that they have first outer end portions 36a, 36b but do not have first mounting portions 232a, 232b. The second side portions 441a, 441b are different from the second side portions 241a, 241b of the third embodiment in that they have second outer end portions 46a, 46b but do not have second mounting portions 242a, 242b.

[0124] The first outer end portions 36a, 36b are formed of a plate (flat plate shape) parallel to the YZ plane and have a shape long in the Z-axis direction. The first outer end portions 36a, 36b extend downward in the Z-axis direction and are connected to the ends of the other side of the first side portions 431a, 431b (the main body of the first side portions 431a, 431b) in the X-axis direction.

[0125] like Fig. 9As shown, the first outer end portions 36a, 36b extend substantially parallel to the end surface on the other side of the first core 20a in the X-axis direction, and the first outer end portions 36a, 36b and the end surface on the other side of the first core 20a in the X-axis direction are opposed to each other along the X-axis direction. In addition, the second outer end portions 46a, 46b extend substantially parallel to the end surface on one side of the second core 20c in the X-axis direction, and the second outer end portions 46a, 46b and the end surface on one side of the second core 20c in the X-axis direction are opposed to each other along the X-axis direction.

[0126] A gap may be formed between the first outer end portion 36a, 36b and the end face on the other side of the first core 20a in the X-axis direction, or the first outer end portion 36a, 36b may abut against the end face. In addition, a gap may be formed between the second outer end portion 46a, 46b and the end face on one side of the second core 20b in the X-axis direction, or the second outer end portion 46a, 46b may abut against the end face.

[0127] In this embodiment, the same effect as in the third embodiment can be obtained. Moreover, in this embodiment, the first lateral portions 431a, 431b extend from the side of the first core 20a to the end face, and the second lateral portions 441a, 441b extend from the side of the second core 20b to the end face. Therefore, a solder fillet can be formed on a portion of the first lateral portions 431a, 431b (first outer end portions 36a, 36b) located on the end face side of the first core 20a, and a solder fillet can be formed on a portion of the second lateral portions 441a, 441b (second outer end portions 46a, 46b) located on the end face side of the second core 20b, and the mounting strength to the mounting substrate can be enhanced through the solder fillet.

[0128] Sixth Embodiment

[0129] The coil device 510 of the sixth embodiment of the present invention is different from the third embodiment described above only in the following points, and the other structures are the same as the third embodiment described above, and the same functions and effects are exerted, and the description of the repeated parts is omitted. In addition, in the drawings, the common symbols are marked for the common parts with the third embodiment.

[0130] like Fig.11 As shown, the coil arrangement 510 has a core 520. Fig.11 and Figure 5ABy comparison, it can be seen that in the core 520, the configuration of the cores 20a, 20b, and 20c is different from the configuration of the cores 20a, 20b, and 20c in the third embodiment. More specifically, in this embodiment, the third core 20c, the first core 20a, and the second core 20b are sequentially configured toward the negative direction side of the X-axis. That is, in this embodiment, among the three cores 20a, 20b, and 20c, the third core 20c is configured at the end on the positive direction side of the X-axis, and the first core 20a is sandwiched by the third core 20c and the second core 20b.

[0131] In addition, in the core 520, the orientation of the first core 20a is different from the orientation of the first core 20a of the third embodiment. More specifically, the first core 20a is configured so that the protruding direction of the outer leg portions 21 and 22 is on the positive direction of the X-axis, and the orientation of the first core 20a of this embodiment is opposite to the orientation of the first core 20a of the third embodiment with respect to the X-axis direction. Therefore, in this embodiment, the orientation of the first core 20a and the orientation of the second core 20b with respect to the X-axis direction are the same.

[0132] In addition, in the coil device 510, the orientation of the first coil 230 is different from that of the first coil 230 of the third embodiment. More specifically, in the third embodiment, Figure 5A As shown, the orientation of the first coil 230 is opposite to the orientation of the second coil 230 with respect to the X-axis direction. However, in this embodiment, as shown in FIG. Fig.11 The orientation of the first coil 230 is the same as the orientation of the second coil 240 with respect to the X-axis direction.

[0133] As long as the coils 230 and 240 are arranged inside the core 520 (arranged to be sandwiched by any one of the cores 20a, 20b, and 20c), as described above, the arrangement and orientation of the cores 20a, 20b, and 20c or the orientation of the coils 30 and 40 can be appropriately changed. In this case, the same effect as the third embodiment can be obtained.

[0134] Seventh embodiment

[0135] The coil device 610 of the seventh embodiment of the present invention is different from the sixth embodiment described above only in the following points, and the other structures are the same as the sixth embodiment described above, and the same effects are exerted, and the description of the repeated parts is omitted. In addition, in the drawings, the components common to the sixth embodiment are marked with common symbols.

[0136] like Fig.12As shown, the coil device 610 has a core 620 and a third coil 60. In addition to the first core 20a, the second core 20b and the third core 20c, the core 620 also has a fourth core 20d. The fourth core 20d has a shape corresponding to the first core 20a or the second core 20b. In the example shown in the figure, the shape of the fourth core 20d is the same as the shape of the first core 20a or the second core 20b. The fourth core 20d is configured in a state facing the same direction as the first core 20a and the second core 20b with respect to the X-axis direction.

[0137] The third coil 60 has a shape corresponding to the first coil 30 or the second coil 40. In the example shown in the figure, the shape of the third coil 60 is the same as the shape of the first coil 30 or the second coil 40. The third coil 60 is arranged in a state facing the same direction as the first coil 30 and the second coil 40 with respect to the X-axis direction.

[0138] In this embodiment, the same effect as that of the sixth embodiment can be obtained. Moreover, in this embodiment, there are n cores (fourth core 20d) corresponding to the first core 20a or the second core 20b. By adding n cores (fourth core 20d) corresponding to the first core 20a or the second core 20b, and adding n coils (third coil 60) corresponding to the first coil 230 or the second coil 240, for example, a coil device 610 with a high inductance value can be realized. In addition, by configuring the coils 30, 40, 60 to be sandwiched between the cores 20a, 20b, 20c, 20d, the coil device 610 can be made compact (space-saving) even when the number of cores and coils increases.

[0139] Eighth Embodiment

[0140] The coil device 710 of the eighth embodiment of the present invention is different from the seventh embodiment described above only in the following points, and the other structures are the same as the seventh embodiment described above, and the same effects are exerted, and the description of the repeated parts is omitted. In addition, in the drawings, the components common to the seventh embodiment are marked with common symbols.

[0141] The coil arrangement 710 has a core 720. Fig.13 and Fig.12 The fourth core 20d is arranged so that its outer legs 21 and 22 face the other end surface of the third core 20c in the X-axis direction.

[0142] The third coil 60 is arranged to be sandwiched between the third core 20c and the fourth core 20d arranged adjacent to each other. The third coil 60 is arranged to face the first coil 30 and the second coil 40 in the opposite direction with respect to the X-axis direction. Figure 5A The second cores 20 b shown are arranged adjacent to each other, and the third coil 60 is sandwiched between the second core 20 b and the fourth core 20 d arranged adjacent to each other.

[0143] As long as the coils 30, 40, 60 are arranged inside the core 20 (arranged to be sandwiched by any one of the cores 20a, 20b, 20c, 20d), the arrangement and orientation of the cores 20a, 20b, 20c, 20d or the orientation of the coils 30, 40, 60 can be appropriately changed. In this case, the same effect as the seventh embodiment can be obtained.

[0144] In addition, the present invention is not limited to the above-mentioned embodiment, and various changes can be made within the scope of the present invention.

[0145] In the first embodiment, the first coil 30 and the second coil 40 may have different shapes. The same applies to the second to eighth embodiments.

[0146] In the first embodiment described above, the first mounting portions 32a, 32b and the second mounting portions 42a, 42b are not essential. Figure 1C In this case, the structure of the coils 30 and 40 can be simplified.

[0147] In the above second embodiment, the first mounting portions 132a, 132b and the second mounting portions 142a, 142b are not essential. Figure 3B In this case, the structure of the coils 130 and 140 can be simplified.

[0148] In the third embodiment, the first mounting portions 232a, 232b and the second mounting portions 242a, 242b are not essential. Figure 5B In this case, the structure of the coils 230 and 240 can be simplified.

[0149] The technology shown in the fourth embodiment can also be applied to the coil device 10 of the first embodiment. Figure 1AThe first side portions 31a, 31b of the first coil 30 shown (the second side portions 41a, 41b of the second coil 40 are also the same) can be configured to extend not only downward in the Z-axis direction from the connecting portion 34, but also upward in the Z-axis direction. Similarly, the technology shown in the fourth embodiment can also be applied to the coil devices of the second to third embodiments and the fifth to eighth embodiments.

[0150] The technique shown in the fifth embodiment may also be applied to the coil device 10 of the first embodiment. Figure 1A The first side portions 31a and 31b of the first coil 30 shown in the figure (the second side portions 41a and 41b of the second coil 40 are also the same) have Fig.10 Similarly, the technique described in the fifth embodiment can also be applied to the coil devices of the second embodiment, the fourth embodiment, and the sixth to eighth embodiments.

[0151] In the sixth embodiment, the coils 30, 40, etc. of the first embodiment, the second embodiment, the fourth embodiment, or the fifth embodiment may be used. In this case, the size of the coils 30, 40, etc. may be changed as needed. The same applies to the seventh and eighth embodiments.

[0152] In the seventh embodiment, the coil device 610 includes only one core (fourth core 20d) corresponding to the first core 20a or the second core 20b, but the number of cores may be two or more. The same applies to the eighth embodiment.

[0153] In the first embodiment, the recess 23 of the first core 20a and / or the recess 23 of the second core 20b may be formed offset on the bottom surface side or the upper surface side of the first core 20a or the second core 20b. By setting such a structure, the magnetic circuit of the first coil 30 or the second coil 40 can be changed, and the magnetic characteristics of the coil device 30 can be adjusted. The same is true for the second embodiment to the eighth embodiment.

[0154] In the first embodiment, any one of the first core 20a, the second core 20b, and the third core 20c may be composed of a split core. By setting such a structure, when the split cores are combined, gaps can be formed between the split cores, and the magnetic coupling between the first coil 30 and the second coil 40 can be adjusted. The same applies to the second to eighth embodiments.

[0155] In the first embodiment, the first core 20a and the second core 20b are respectively made of magnetic materials, and the third core 20c can be made of non-magnetic materials. In this way, by making only the third core 20c of non-magnetic materials, the inductance value of the coil device 10 can be adjusted to a desired value, for example. The same applies to the second embodiment to the eighth embodiment.

[0156] In the first embodiment, the core 20 is composed of a combination of a first core 20a and a second core 20b formed in a U-shape and a third core 20c formed in an I-shape, but the core 20 may be composed of, for example, a combination of an H-shaped core and two I-shaped cores. The same is true for the second to sixth embodiments. In addition, in the seventh and eighth embodiments, an H-shaped core may be used.

[0157] Explanation of symbols

[0158] 10, 110, 210, 310, 410, 510, 610, 710 coil devices

[0159] 20, 520, 620, 720 cores

[0160] 20a First Core

[0161] 20b Second core

[0162] 20c Third core

[0163] 20d Fourth core

[0164] 21 First outer crus

[0165] 22 Second outer crus

[0166] 23 recess

[0167] 30, 130, 230, 330, 430 First coil

[0168] 31a, 31b, 131a, 131b, 231a, 231b, 331a, 331b, 431a, 431b first side portion

[0169] 32a, 32b, 132a, 132b, 232a, 232b first mounting portion

[0170] 33a, 33b First concave portion

[0171] 34 First connection

[0172] 35a, 35b, 135a, 135b first lateral protrusion

[0173] 36a, 36b first outer end

[0174] 40, 140, 240, 340, 440 Second coil

[0175] 41a, 41b, 141a, 141b, 241a, 241b, 341a, 341b, 441a, 441b Second side portion

[0176] 42a, 42b, 142a, 142b, 242a, 242b Second mounting portion

[0177] 43a, 43b second concave portion

[0178] 44 Second connection

[0179] 45a, 45b, 145a, 145b Second lateral protrusion

[0180] 46a, 46b Second outer end

[0181] 51 First gap

[0182] 52 Second gap portion.

Claims

1. A coil device, comprising: A pair of a first core and a second core; A third core disposed adjacent to the first core or the second core; and a pair of first coils and second coils, which are respectively arranged between any two adjacent cores among the first core, the second core and the third core, The first coil and the second coil have respective plate surfaces facing each other, The opposite plate surface of the first coil is a first connecting portion. The opposite plate surface of the second coil is a second connecting portion. A portion of each of the first coil and the second coil is exposed on a side of the first core, the second core or the third core. The part of the first coil exposed laterally is a pair of plate-shaped first side portions, bends from the first connection portion in a direction away from the third core, The part of the second coil exposed at the side is a pair of plate-shaped second side parts. bend from the second connection portion in a direction away from the third core, The first side portion has a first side protrusion protruding toward the third core, The second lateral portion has a second lateral protrusion that protrudes toward the third core.

2. A coil device, comprising: A pair of a first core and a second core; A third core disposed adjacent to the first core or the second core; and a pair of first coils and second coils, which are respectively arranged between any two adjacent cores among the first core, the second core and the third core, The first coil and the second coil have respective plate surfaces facing each other, A portion of each of the first coil and the second coil is exposed on a side of the first core, the second core or the third core. The part of the first coil exposed laterally is a pair of plate-shaped first side portions. bends from the first connection portion in a direction away from the third core, The part of the second coil exposed laterally is a pair of plate-shaped second side portions. bends from the second connecting portion in a direction away from the third core, The first side portion has a first side protrusion protruding toward the third core, The second side portion has a second side protrusion protruding toward the third core, A first recess through which the first coil passes is formed on the first core. A second recessed portion through which the second coil passes is formed on the second core. The opposite plate surface of the first coil is a first connecting portion. The opposite plate surface of the second coil is a second connecting portion. The first connecting portion is engaged with the first recessed portion. The second connection portion is engaged with the second recess.

3. The coil device according to claim 1 or 2, wherein: The first connecting portion connects each of a pair of the first side portions. The second connection portion connects each of a pair of the second side portions.

4. The coil device according to any one of claims 1 to 3, wherein: The first connection portion and the second connection portion are each disposed between any two adjacent cores among the first core, the second core, and the third core.

5. The coil device according to any one of claims 1 to 3, wherein: The first side portion and the second side portion are respectively opposed to a side surface of any one of the first core, the second core, and the third core.

6. The coil device according to any one of claims 1 to 3, wherein: The first side portion and the second side portion are respectively opposed to side surfaces of any two cores among the first core, the second core, and the third core.

7. The coil device according to any one of claims 1 to 3, wherein: The first side portion and the second side portion extend from a side surface to a bottom surface of any one of the first core, the second core, and the third core, respectively.

8. The coil device according to any one of claims 1 to 3, wherein: The first side portion and the second side portion extend from a side surface of any one of the first core, the second core, and the third core to an upper surface, respectively.

9. The coil device according to any one of claims 1 to 3, wherein: The first side portion and the second side portion extend from a side surface to an end surface of any one of the first core, the second core, and the third core, respectively.

10. The coil device according to any one of claims 1 to 3, wherein: The first core, the second core, and the third core are formed to be long in a direction perpendicular to a substrate surface of a mounting substrate.

11. The coil device according to claim 1, wherein: A first recess through which the first coil passes is formed on the first core. A second recessed portion through which the second coil passes is formed on the second core. The first recessed portion or the second recessed portion is formed at a position offset on a bottom surface side or an upper surface side of the first core or the second core.

12. The coil device according to any one of claims 1 to 3, wherein: The device further includes n cores corresponding to the first core or the second core.

13. The coil device according to any one of claims 1 to 3, wherein: Any one of the first core, the second core, and the third core is composed of a split core.

14. The coil device according to any one of claims 1 to 3, wherein: The first core and the second core are respectively made of magnetic materials. The third core is made of a non-magnetic body.

15. The coil device according to any one of claims 1 to 3, wherein: The third core is arranged between the first core and the second core, The first coil is arranged between the first core and the third core. The second coil is arranged between the second core and the third core, The plate surfaces of the first coil and the second coil are opposed to each other with the third core interposed therebetween. A portion of the first coil is exposed on a side of the first core, and a portion of the second coil is exposed on a side of the second core.

16. The coil device according to any one of claims 1 to 3, wherein: A ratio W3 / W2 of a distance W3 between the first lateral protrusion and the second lateral protrusion in the X-axis direction and a width W2 of the third core in the X-axis direction is 0.1 to 0.8.

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