Coil components

Abstract

The present invention provides a coil component that can reduce the inter-wire capacitance between a first wire and a second wire in an overlapping winding region. The coil component (10) includes a core (20), a first wire (31) and a second wire (41). The core has a prismatic winding core (21). The first wire (31) and the second wire (41) are wound on the winding core. An overlapping winding region (50) is provided in the coil component, in which the first wire is wound on the winding core and the second wire is wound on the winding core from above the first wire. The overlapping winding region has a specified portion (51), which is a portion where the first wire and the second wire are wound on the winding core so that a gap (SP) is sandwiched between a portion of the first wire wound on the side of the winding core and a portion of the second wire wound on the side (211).

Description

Technical Field

[0001] The present disclosure relates to a coil component in which a plurality of wires are wound around a winding core portion of a core body. Background Art

[0002] Patent document 1 describes an example of a common mode choke coil. The common mode choke coil includes a core, a first wire, and a second wire. The core includes: a winding core portion around which the first wire and the second wire are wound; a first flange portion connected to a first end of the winding core portion; and a second flange portion connected to a second end of the winding core portion.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2017-183444

[0004] The common mode choke coil has an overlapped winding region, which is a region where the first wire and the second wire are wound around the winding core by overlapped winding. The overlapped winding region has an overlapped winding structure in which the first wire is wound around the winding core and the second wire is wound around the winding core from above. In such an overlapped winding structure, the density of the wires increases, so the inter-wire capacitance between the first wire and the second wire is likely to increase. Summary of the invention

[0005] The coil component for solving the above-mentioned problem comprises: a core body having a prismatic winding core, a first flange connected to the first end of the winding core in the axial direction of the winding core, and a second flange connected to the second end of the winding core in the axial direction; and a first wire and a second wire wound on the winding core. The winding core has a first side surface, a second side surface connected to the first side surface via a first corner, and a third side surface connected to the first side surface via a second corner. The coil component is provided with an overlapping winding area, which is an area where the first wire is wound on the winding core and the second wire is wound on the winding core from above the first wire. The overlapping winding area has a predetermined portion, which is a portion where the first wire and the second wire are wound on the winding core in a manner such that a gap is sandwiched between the portion of the first wire wound on the first side surface and the portion of the second wire wound on the first side surface.

[0006] According to the above structure, in a predetermined portion of the overlapping winding area, the first wire and the second wire are wound around the winding core in a manner that a gap is sandwiched between the portion of the first wire wound around the first side surface and the portion of the second wire wound around the first side surface. As a result, a portion where the distance between the first wire and the second wire is large can be provided. That is, a portion where the density of the wire is low can be formed. As a result, the inter-wire capacitance between the first wire and the second wire can be made small.

[0007] According to the coil component described above, the inter-wire capacitance between the first wire and the second wire can be reduced in the lapped winding region. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view showing the coil component according to the first embodiment.

[0009] Figure 2 is a top view of the coil component.

[0010] Figure 3 It is a diagram schematically showing the cross-sectional shape of the coil component.

[0011] Figure 4 It is a diagram schematically showing a partial cross-sectional shape of the coil component.

[0012] Figure 5 Yes Figure 4 A partially enlarged image of .

[0013] Figure 6 This is a schematic diagram for explaining the positional relationship between the first wire member and the second wire member.

[0014] Figure 7 : is a diagram showing an equivalent circuit of the coil component.

[0015] Figure 8 This is a schematic diagram for explaining a state in which inter-wire capacitance is generated between a first wire and a second wire.

[0016] Fig. 9 This is a graph showing the relationship between the frequency of a signal input to a coil component and the intensity ratio of an output signal to the coil component relative to the input signal.

[0017] Fig.10 It is a diagram schematically showing a partial cross-sectional shape of a coil component according to the second embodiment.

[0018] Fig.11 Yes Fig.10 A partially enlarged image of .

[0019] Fig.12 It is a diagram schematically showing a partial cross-sectional shape of a coil component according to a modified example.

[0020] Fig.13 It is a diagram schematically showing a partial cross-sectional shape of a coil component according to a modified example.

[0021] Fig.14 It is a diagram schematically showing a partial cross-sectional shape of a coil component according to a modified example.

[0022] Description of Reference Numerals

[0023] 10, 10A, 10B…coil component; 20…core body; 21…winding core portion; 21a…first end; 21b…second end; 211-214…side surface; 22…first flange portion; 23…second flange portion; 31…first wire; 311…outermost end; 41…second wire; 411…innermost end; 50…winding area; 51…specified portion; C1-C4…corner; F…center axis; SP…gap. DETAILED DESCRIPTION

[0024] (First embodiment)

[0025] Below, according to Figures 1 to 9 An embodiment of a coil component is described. In addition, the accompanying drawings sometimes enlarge the components for easy understanding. Sometimes the size ratio of the components is different from the actual situation, or different from the size in other figures. In addition, the section line is marked in the sectional view, but sometimes the section line of a part of the components is omitted for easy understanding.

[0026] like Figure 1 and Figure 2 As shown, the coil component 10 includes a core 20 and a plurality of wires 31 and 41 wound around the core 20. The coil component 10 is, for example, a common mode choke coil.

[0027] The core 20 contains, for example, an electrically insulating material. Specifically, the core 20 contains a non-magnetic material such as alumina and a resin, and a magnetic material such as ferrite and a resin containing magnetic powder. The core 20 is preferably made of a sintered body such as alumina and ferrite.

[0028] The core 20 includes a polygonal winding core 21, a first flange 22 connected to a first end 21a of the winding core 21 in the axial direction Z1, and a second flange 23 connected to a second end 21b of the winding core 21 in the axial direction Z1. The axial direction Z1 is the direction in which the central axis F of the winding core 21 extends.

[0029] Figure 3 is Figure 2 Schematic diagram of a cross section of the coil component 10 cut along the line LN1 shown. The line LN1 is an imaginary straight line extending in a direction perpendicular to the axial direction Z1 and passing through the center of the core 20 in the axial direction Z1. That is, Figure 3 The cross section of the winding core 21 shown is a cross section when the winding core 21 is cut in a direction perpendicular to the axial direction Z1. Figure 3 As shown, the winding core 21 may be a quadrangular prism. Of course, the winding core 21 may not be a quadrangular prism as long as it is a prism shape.

[0030] like Figure 3As shown, when the winding core 21 is a quadrangular prism, the winding core 21 has four side surfaces 211, 212, 213, and 214. In the circumferential direction Z3 centered on the central axis F of the winding core 21, the first end of the side surface 211 is connected to the second end of the side surface 212 via the corner C1. The second end of the side surface 211 is connected to the first end of the side surface 213 via the corner C2. The first end of the side surface 212 is connected to the second end of the side surface 214 via the corner C3. The second end of the side surface 213 is connected to the first end of the side surface 214 via the corner C4. The "first end of the side surface" mentioned here is Figure 3 The counterclockwise end is the "second end of the side" Figure 3 at the end in a clockwise direction.

[0031] also, Figure 3 In the figure, for the sake of convenience of explanation and understanding, each wire 31, 41 is shown in a ring shape, but in fact, each wire 31, 41 is not in a ring shape.

[0032] The length of the side surface 211, which is the shortest distance from the corner C1 to the corner C2, is referred to as the first distance L1. That is, the first distance L1 is a straight line extending from the corner C1 to the corner C2 in a direction perpendicular to the axial direction Z1. Figure 3 In the cross section of the winding core 21 shown in FIG. 1 , the length of the line representing the side surface 211 corresponds to the first distance L1. The length of the side surface 212, which is the shortest distance from the corner C1 to the corner C3, is set to the second distance L2. That is, the second distance L2 is a straight line extending in a direction perpendicular to the axial direction Z1 among the straight lines extending from the corner C1 to the corner C3. More specifically, in Figure 3 In the cross section of the winding core 21 shown in FIG. 1 , the length of the line representing the side surface 212 corresponds to the second distance L2. The length of the side surface 213, which is the shortest distance from the corner C2 to the corner C4, is set to the third distance L3. That is, the third distance L3 is a straight line extending in a direction perpendicular to the axial direction Z1 among the straight lines extending from the corner C2 to the corner C4. More specifically, in Figure 3 In the cross section of the winding core 21 shown in FIG. 1 , the length of the line representing the side surface 213 corresponds to the third distance L3. The length of the side surface 214, which is the shortest distance from the corner C3 to the corner C4, is set as the fourth distance L4. That is, the fourth distance L4 is a straight line extending in a direction perpendicular to the axial direction Z1 among the straight lines extending from the corner C3 to the corner C4. More specifically, in Figure 3 In the cross section of the winding core 21 shown in FIG. 1 , the length of the line representing the side surface 214 corresponds to the fourth distance L4. Figure 3In the example shown, the first distance L1 is longer than the second distance L2 and longer than the third distance L3. Furthermore, for example, the fourth distance L4 is longer than the second distance L2 and longer than the third distance L3.

[0033] As mentioned above, Figure 3 It is a diagram in which the coil component 10 is cut at the center of the core portion 21 in the axial direction Z1. Therefore, the first distance L1 can be referred to as the straight-line distance from the corner C1 to the corner C2 at the center of the core portion 21 in the axial direction Z1. The second distance L2 can be referred to as the straight-line distance from the corner C1 to the corner C3 at the center of the core portion 21 in the axial direction Z1. The third distance L3 can be referred to as the straight-line distance from the corner C2 to the corner C4 at the center of the core portion 21 in the axial direction Z1. The fourth distance L4 can be referred to as the straight-line distance from the corner C3 to the corner C4 at the center of the core portion 21 in the axial direction Z1.

[0034] like Figure 1 and Figure 2 As shown in the figure, the first wire 31 and the second wire 41 are wound around the winding core 21. That is, the first wire 31 and the second wire 41 are respectively wound around the winding core 21 in a spiral shape. In addition, the direction in which the first wire 31 is wound around the winding core 21 is the same as the direction in which the second wire 41 is wound around the winding core 21. In addition, the number of turns of the first wire 31 wound around the winding core 21 is substantially the same as the number of turns of the second wire 41 wound around the winding core 21.

[0035] In the present embodiment, the first wire 31 is directly wound on the winding core 21. Furthermore, the second wire 41 is wound on the winding core 21 on which the first wire 31 is wound. When the region in which the first wire 31 is wound on the winding core 21 and the second wire 41 is wound on the winding core 21 from above the first wire 31 is defined as the “overlapping region 50”, it can be said that the coil component 10 has the overlapping region 50.

[0036] The first terminal electrode 11a and the second terminal electrode 11b are provided on the first flange portion 22. That is, the second terminal electrode 11b is arranged at the same position as the first terminal electrode 11a in the axial direction Z1. In addition, in the direction orthogonal to the axial direction Z1, the second terminal electrode 11b is located on the opposite side of the first terminal electrode 11a across the central axis F of the winding core portion 21.

[0037] The third terminal electrode 12a and the fourth terminal electrode 12b are provided on the second flange portion 23. That is, in the axial direction Z1, the fourth terminal electrode 12b is arranged at the same position as the third terminal electrode 12a. In addition, in the direction orthogonal to the axial direction Z1, the fourth terminal electrode 12b is located on the opposite side of the third terminal electrode 12a across the central axis F.

[0038] The first terminal electrode 11a and the third terminal electrode 12a are located on the first side ( Figure 2 The second terminal electrode 11b and the fourth terminal electrode 12b are located on the second side in the direction perpendicular to the axial direction Z1 ( Figure 2 center left).

[0039] The first end 31a of the first wire 31 is electrically connected to the first terminal electrode 11a, and the second end 31b of the first wire 31 is electrically connected to the third terminal electrode 12a. On the other hand, the first end 41a of the second wire 41 is electrically connected to the second terminal electrode 11b, and the second end 41b of the second wire 41 is electrically connected to the fourth terminal electrode 12b. That is, the first end 31a and the second end 31b of the first wire 31 are both located on the first side ( 1 ) in the direction orthogonal to the axial direction Z1. Figure 2 The first end 41a and the second end 41b of the second wire 41 are both located on the second side ( Figure 2 The terminal electrodes (on the left side in the center) are electrically connected.

[0040] Next, refer to Figure 3 to Figure 6 , the overlapping winding area 50 is described in detail. In addition, Figure 4 Schematically shown in Figure 2 The line LN2 shown is a partial cross section of the coil component 10. When the direction along the side surface 211 that is orthogonal to the axial direction Z1 is defined as the "width direction Z2", the line LN2 is an imaginary straight line extending in the axial direction Z1 and passing through the middle position of the side surface 211 in the width direction Z2. That is, Figure 4 The cross section of the winding core 21 shown is a part of the cross section when the winding core 21 is cut in a direction perpendicular to the width direction Z2.

[0041] like Figure 3 , Figure 4 and Figure 5 As shown, the lapped region 50 has a predetermined portion 51. In the present embodiment, the predetermined portion 51 is a portion of the lapped region 50 where the first wire 31 and the second wire 41 are wound around the winding core 21 while satisfying all of the following conditions (B1), (B2), (B3), and (B4).

[0042] (B1) A gap SP is provided between a portion of the first wire 31 wound around the side surface 211 and a portion of the second wire 41 wound around the side surface 211 .

[0043] (B2) A gap SP is provided between a portion of the first wire 31 wound around the side surface 212 and a portion of the second wire 41 wound around the side surface 212 .

[0044] (B3) A gap SP is provided between a portion of the first wire 31 wound around the side surface 213 and a portion of the second wire 41 wound around the side surface 213 .

[0045] (B4) A gap SP is provided between a portion of the first wire 31 wound around the side surface 214 and a portion of the second wire 41 wound around the side surface 214 .

[0046] In addition, in the present embodiment, the prescribed portion 51 also satisfies all of the above-mentioned conditions (B1) to (B4). However, it is not limited to this. For example, the prescribed portion may be a portion where the first wire 31 and the second wire 41 are wound around the winding core 21 while satisfying any one of the above-mentioned conditions (B1) to (A4). That is, in the prescribed portion, a gap SP may be provided between the first wire 31 and the second wire 41 wound around at least one of the side surfaces 211 to 214 of the winding core 21. More preferably, in the prescribed portion 51, a gap SP is provided between the first wire 31 and the second wire 41 on the side surface of the longest distance among the distances L1 to L4.

[0047] The interval H1 between the first wire 31 and the second wire 41 wound on the side 211 is described. The interval H1 is "0" at the corner C1. That is, the first wire 31 and the second wire 41 are in contact with each other. As the distance from the corner C1 approaches the corner C2, the interval H1 increases. Moreover, at the middle position between the corner C1 and the corner C2, the interval H1 is the largest. The maximum value of the interval H1 is set to "maximum interval H1max". As the distance H1 approaches the corner C2 from the middle position, the interval H1 becomes narrower. Moreover, at the corner C2, the interval H1 is "0". That is, the first wire 31 and the second wire 41 are in contact with each other.

[0048] The interval H4 between the first wire 31 and the second wire 41 wound on the side 214 is described. At the corner C3, the interval H4 is "0". That is, the first wire 31 and the second wire 41 are in contact with each other. As the distance from the corner C3 to the corner C4 approaches, the interval H4 increases. Moreover, at the middle position between the corner C3 and the corner C4, the interval H4 is the largest. The maximum value of the interval H4 is set to "maximum interval H4max". As it approaches the corner C4 from the middle position, the interval H4 becomes narrower. Moreover, at the corner C4, the interval H4 is "0". That is, the first wire 31 and the second wire 41 are in contact with each other.

[0049] The interval H2 between the first wire 31 and the second wire 41 wound on the side 212 is described. At the corner C1, the interval H2 is "0". That is, the first wire 31 and the second wire 41 are in contact with each other. As the distance from the corner C1 to the corner C3 approaches, the interval H2 increases. Moreover, at the middle position between the corner C1 and the corner C3, the interval H2 is the largest. The maximum value of the interval H2 is set to "maximum interval H2max". As it approaches the corner C3 from the middle position, the interval H2 narrows. Moreover, in the corner C3, the interval H2 is "0". That is, the first wire 31 and the second wire 41 are in contact with each other.

[0050] The interval H3 between the first wire 31 and the second wire 41 wound on the side 213 is described. At the corner C2, the interval H3 is "0". That is, the first wire 31 and the second wire 41 are in contact with each other. As it moves from the corner C2 toward the corner C4, the interval H3 increases. Moreover, at the middle position between the corner C2 and the corner C4, the interval H3 is the largest. The maximum value of the interval H3 is referred to as the "maximum interval H3max". As it approaches the corner C4 from the middle position, the interval H3 becomes narrower. Moreover, at the corner C4, the interval H2 is "0". That is, the first wire 31 and the second wire 41 are in contact with each other.

[0051] In this embodiment, the first distance L1 and the fourth distance L4 are respectively greater than the second distance L2, and greater than the third distance L3. Figure 3 As shown, the maximum interval H1max is larger than both the maximum interval H2max and the maximum interval H3max. Similarly, the maximum interval H4max is larger than both the maximum interval H2max and the maximum interval H3max.

[0052] In addition, if Figure 6 As shown, the above-mentioned maximum intervals H1max, H2max, H3max, H4max are set to satisfy the following (A1) and (A2). The upper limit radial position mentioned below refers to the position of the outermost end 311 of the first wire 31 away from the outer side of the diameter D2 of the second wire 41 in the radial direction Z4 centered on the central axis F of the winding core 21.

[0053] (A1) In the radial direction Z4, the innermost end 411 of the second wire 41 is located outside the outermost end 311 of the first wire 31 ( Figure 6 Upper middle side).

[0054] (A2) In the radial direction Z4, the innermost end 411 of the second wire 41 is located inside the upper limit radial position ( Figure 6 Middle inner side).

[0055] That is, in the portion of the first wire 31 wound around the side surface 211, the portion located most outside in the radial direction Z4 is set as the outermost end 311, and in the portion of the second wire 41 wound around the side surface 211, the portion located most inside in the radial direction Z4 is set as the innermost end 411. In this case, the maximum interval H1max is set to satisfy: the innermost end 411 of the portion of the second wire 41 wound around the side surface 211 is located radially outward compared to the outermost end 311 of the portion of the first wire 31 wound around the side surface 211; and the innermost end 411 of the second wire 41 is located inside compared to the position of the outermost end 311 of the first wire 31 at the diameter D2.

[0056] In the portion of the first wire 31 wound around the side surface 212, the portion located most outside in the radial direction Z4 is set as the outermost end 311, and in the portion of the second wire 41 wound around the side surface 212, the portion located most inside in the radial direction Z4 is set as the innermost end 411. In this case, the maximum interval H1max is set to satisfy: the innermost end 411 of the portion of the second wire 41 wound around the side surface 212 is located radially outward compared to the outermost end 311 of the portion of the first wire 31 wound around the side surface 212; and the innermost end 411 of the second wire 41 is located inside compared to the position of the outermost end 311 of the first wire 31 at the diameter D2.

[0057] In the portion of the first wire 31 wound around the side surface 213, the portion located most outside in the radial direction Z4 is set as the outermost end 311, and in the portion of the second wire 41 wound around the side surface 213, the portion located most inside in the radial direction Z4 is set as the innermost end 411. In this case, the maximum interval H1max is set to satisfy: the innermost end 411 of the portion of the second wire 41 wound around the side surface 213 is located radially outward compared to the outermost end 311 of the portion of the first wire 31 wound around the side surface 213; and the innermost end 411 of the second wire 41 is located inside compared to the position of the outermost end 311 of the first wire 31 at the diameter D2.

[0058] In the portion of the first wire 31 wound around the side surface 214, the portion located most outside in the radial direction Z4 is set as the outermost end 311, and in the portion of the second wire 41 wound around the side surface 214, the portion located most inside in the radial direction Z4 is set as the innermost end 411. In this case, the maximum interval H1max is set to satisfy: the innermost end 411 of the portion of the second wire 41 wound around the side surface 214 is located radially outward compared to the outermost end 311 of the portion of the first wire 31 wound around the side surface 214; and the innermost end 411 of the second wire 41 is located inside compared to the position of the outermost end 311 of the first wire 31 at the diameter D2.

[0059] By satisfying the above (A1), the second wire 41 is located outside the outermost end 311 of the first wire 31 in the radial direction Z4 at the middle position of the two corners located at both ends of the side. In addition, by satisfying the above (A2), the interval between the outermost end 311 of the first wire 31 and the innermost end 411 of the second wire 41 is narrower than the diameter D2 of the second wire 41 at the middle position of the two corners located at both ends of the side.

[0060] However, at the corners C1 to C4, the second wire member 41 is in contact with the first wire member 31. Therefore, the above-mentioned (A1) may not be satisfied in the vicinity of the corners C1 to C4.

[0061] Incidentally, when the side 211 of the four side surfaces 211 to 214 of the winding core 21 is regarded as the "first side surface", the side 212 is equivalent to the "second side surface", the side 213 is equivalent to the "third side surface", and the side 214 is equivalent to the "fourth side surface". In addition, the corner C1 connecting the side surface 211 and the side surface 212 is equivalent to the "first corner", and the corner C2 connecting the side surface 211 and the side surface 213 is equivalent to the "second corner". In addition, the corner C3 connecting the side surface 212 and the side surface 214 is equivalent to the "third corner", and the corner C4 connecting the side surface 213 and the side surface 214 is equivalent to the "fourth corner".

[0062] Next, the operation of this embodiment will be described.

[0063] Figure 7 The figure shows an equivalent circuit of a coil component in which both the first wire 31 and the second wire 41 are wound around a winding core 21. In this case, the first wire 31 and the second wire 41 form a capacitor 100. That is, the capacitance of the capacitor 100, that is, the inter-wire capacitance LC, is generated between the first wire 31 and the second wire 41 near the first wire 31. For example, Figure 8 As shown, an inter-wire capacitance LC is generated between the first turn of the second wire 41 and the first turn of the second wire 41. An inter-wire capacitance LC is generated between the first turn of the second wire 41 and the second turn of the first wire 31. The magnitude of the inter-wire capacitance LC is proportional to the physical distance between the wires 31 and 41. Therefore, the narrower the interval between the first wire 31 and the second wire 41, the larger the inter-wire capacitance LC. Moreover, if the inter-wire capacitance LC is large, there is a concern that the high-frequency characteristics of the coil component will deteriorate.

[0064] In the lapped region 50 of the coil component 10 of the present embodiment, a region is formed in which a gap SP is sandwiched between the first wire 31 and the second wire 41. That is, the lapped region 50 has a predetermined portion 51. In the predetermined portion 51, the number of places where the interval between the first wire 31 and the second wire 41 is narrow can be reduced.

[0065] The inter-wire capacitance LCA of the coil component of the comparative example in which no gap is provided between the first wire 31 and the second wire 41 in the lapped winding region 50 is larger than the inter-wire capacitance LC of the coil component 10 of the present embodiment. This is because the lapped winding region 50 of the coil component 10 of the present embodiment has a portion where the gap between the first wire 31 and the second wire 41 is large, whereas the lapped winding region of the coil component of the comparative example does not have a portion where the gap between the first wire 31 and the second wire is large. Fig. 9 , with respect to the mode conversion characteristics, the relationship between the frequency of the signal input to the coil component and the intensity ratio of the output signal of the coil component to the input signal to the coil component is shown. Fig. 9 In , the dotted line represents the relationship in the coil component of the comparative example, and the solid line represents the relationship in the coil component 10 of the present embodiment. When the frequency of the signal input to the coil component is relatively low, the magnitude of the above-mentioned intensity ratio in the coil component 10 of the present embodiment becomes equal to the magnitude of the above-mentioned intensity ratio in the coil component of the comparative example. However, when the frequency of the input signal becomes higher due to the small inter-line capacitance LC, a difference arises between the magnitude of the above-mentioned intensity ratio of the coil component 10 of the present embodiment and the magnitude of the above-mentioned intensity ratio of the coil component of the comparative example. Specifically, the magnitude of the above-mentioned intensity ratio of the coil component 10 of the present embodiment is smaller than the magnitude of the above-mentioned intensity ratio of the coil component of the comparative example. Therefore, the high-frequency mode conversion characteristics of the coil component 10 of the present embodiment are better than the high-frequency mode conversion characteristics of the coil component of the comparative example. In other words, the high-frequency characteristics of the coil component 10 of the present embodiment are better than the high-frequency characteristics of the coil component of the comparative example.

[0066] In addition, in this embodiment, the following effects can be further obtained.

[0067] (1-1) In the predetermined portion 51, a region is formed in which a gap SP is sandwiched between the first wire 31 wound around the winding core 21 and the second wire 41 wound around the winding core 21 from the first wire 31. By providing a portion where the distance between the first wire 31 and the second wire 41 is large, the inter-wire capacitance LC generated between the first wire 31 and the second wire 41 can be reduced by the amount of the portion where the density of the wires is low. Furthermore, by reducing the inter-wire capacitance LC, the high-frequency characteristics of the coil component 10 can be improved.

[0068] (1-2) In the present embodiment, the entire region of the lapped region 50 in the axial direction Z1 is defined as the predetermined portion 51. As the proportion of the predetermined portion 51 in the lapped region 50 increases, the effect of reducing the inter-wire capacitance LC generated between the first wire 31 and the second wire 41 can be enhanced.

[0069] In addition, the "entire region of the overlapping winding area 50" described here may not include the portion where the first wire 31 and the second wire 41 start winding and the portion where the first wire 31 and the second wire 41 end winding. This is because the tension of the wire is unstable at the beginning and end of winding due to the different winding methods. When the tension of the wire is unstable, it is difficult to properly adjust the relative position of the second wire 41 with respect to the first wire 31. Of course, in the case where the tension of the wire can be stabilized at the beginning and end of winding of the wire, the specified portion 51 may also include the portion where the wire starts winding, and the specified portion 51 may also include the portion where the wire ends winding.

[0070] (1-3) The interval between the first wire 31 and the second wire 41 at the side with a longer straight-line distance from the first end to the second end wound in the circumferential direction Z3 is larger than the interval between the first wire 31 and the second wire 41 at the side with a shorter straight-line distance from the first end to the second end wound in the circumferential direction Z3. By increasing the interval between the first wire 31 and the second wire 41 at the side with a longer straight-line distance from the first end to the second end in this way, the effect of reducing the inter-wire capacitance LC generated between the first wire 31 and the second wire 41 can be improved.

[0071] (1-4) In this embodiment, the first wire 31 and the second wire 41 are wound around the winding core 21 to satisfy the above (A1) in the predetermined portion 51. This can increase the interval between the first wire 31 and the second wire 41, thereby reducing the inter-wire capacitance LC.

[0072] (1-5) In this embodiment, the first wire 31 and the second wire 41 are wound around the winding core 21 to satisfy the above-mentioned (A2) in the predetermined portion 51. Thus, the second wire 41 can be wound around the winding core 21 without causing winding disorder.

[0073] (Second embodiment)

[0074] Next, according to Fig.10 and Fig.11 In the following description, the parts different from the first embodiment are mainly described, and the same reference numerals are given to the same or corresponding components as those in the first embodiment, and duplicate descriptions are omitted.

[0075] like Fig.10 As shown in FIG. 1 , the coil component 10A includes a lapped winding region 50. The lapped winding region 50 has a predetermined portion 51. Fig.10 and Fig.11As shown, a portion of the overlapping region 50 in the axial direction Z1 is a prescribed portion 51, but the remaining portion is not the prescribed portion 51. The portion of the overlapping region 50 that is not the prescribed portion 51 is referred to as a "non-prescribed portion 52".

[0076] exist Fig.10 In the example shown, in the axial direction Z1, the area close to the first flange portion 22 in the overlapping area 50 is the prescribed portion 51. The area closer to the second flange portion 23 than the prescribed portion 51 in the overlapping area 50 is the non-prescribed portion 52. In the non-prescribed portion 52, between the two corners located on both sides of the side surface, the second wire 41 does not separate from the first wire 31. That is, the first wire 31 and the second wire 41 are in contact with each other.

[0077] In the present embodiment, the lapped winding region 50 includes both the prescribed portion 51 and the non-prescribed portion 52. In this case, the inter-wire capacitance LC generated between the first wire 31 and the second wire 41 can be reduced as compared to the case where the lapped winding region 50 does not include the prescribed portion 51. Therefore, the high frequency characteristics of the coil component 10A can be improved.

[0078] In addition, the tension applied to the second wire 41 when the second wire 41 is wound around the winding core 21 in order to form the non-specified portion 52 is used as the reference tension. Preferably, when forming the specified portion 51, the tension applied to the second wire 41 when the second wire 41 is wound around the winding core 21 is smaller than the reference tension. Thus, the first wire 31 can be separated from the second wire 41 between the two corners on both sides of the side surface. That is, the specified portion 51 can be formed.

[0079] (Change Example)

[0080] The above-mentioned embodiments can be implemented by modification as follows. The above-mentioned embodiments and the following modification examples can be implemented in combination with each other within the range that there is no technical contradiction.

[0081] In the second embodiment, in the overlapped region 50 , a portion close to the second flange portion 23 in the axial direction Z1 may be the prescribed portion 51 , and a portion close to the first flange portion 22 in the axial direction Z1 may be the non-prescribed portion 52 .

[0082] The coil component may include, in addition to the lapped winding region 50 , a two-wire region in which the first wire 31 and the second wire 41 are wound around the winding core 21 by two-wire winding.

[0083] For example Fig.12As shown, the coil component 10B may be configured such that the lapped winding region 50 is provided near the first flange portion 22 in the axial direction Z1 , and the double wire region 60 is disposed on the opposite side of the first flange portion 22 across the lapped winding region 50 .

[0084] For example Fig.13 As shown, the coil component 10B can also be constructed by configuring the first double-wire area 61 near the first flange portion 22 in the axial direction Z1, configuring the second double-wire area 62 near the second flange portion 23 in the axial direction Z1, and configuring the overlapping winding area 50 between the first double-wire area 61 and the second double-wire area 62.

[0085] For example Fig.14 As shown, the coil component 10B may be provided with the lapped region 50 near the second flange portion 23 in the axial direction Z1 , and the double wire region 60 may be arranged on the opposite side of the second flange portion 23 across the lapped region 50 .

[0086] For example, the coil component 10B may be configured such that a first overlapping region is disposed near the first flange portion 22 in the axial direction Z1, a second overlapping region is disposed near the second flange portion 23 in the axial direction Z1, and a double-wire region 60 is disposed between the first overlapping region and the second overlapping region.

[0087] The overlapping region may be configured such that the prescribed portions 51 and the non-prescribed portions 52 are alternately arranged in the axial direction Z1.

[0088] The dimension of the predetermined portion 51 in the axial direction Z1 may be a length corresponding to one turn of the first wire 31. That is, in the overlapping winding region, a gap SP may be provided between a portion of the first wire 31 wound around the first side surface and a portion of the second wire 41 wound around the first side surface at only one location.

[0089] In the predetermined portion 51, as long as the portion of the second wire 41 wound around the side surface 211 is separated from the portion of the first wire 31 wound around the side surface 211, the above-mentioned (A1) may not be satisfied. That is, as long as there is a portion of the predetermined portion 51 on the side surface 211 where the second wire 41 is separated from the first wire 31, there may be a portion on the side surface 211 where the second wire 41 contacts the first wire 31.

[0090] In the predetermined portion 51, the above-mentioned (A2) may not be satisfied.

[0091] The above-mentioned maximum interval H2max may be the same as the above-mentioned maximum interval H1max, or may be larger than the maximum interval H1max.

[0092] The above-mentioned maximum interval H3max may be the same as the above-mentioned maximum interval H1max, or may be larger than the maximum interval H1max.

[0093] In the predetermined portion 51 , the first wire 31 and the second wire 41 may be wound around the winding core 21 so that the interval H1 becomes maximum at a position different from the middle position between the corners C1 and C2 .

[0094] In the predetermined portion 51 , the first wire 31 and the second wire 41 may be wound around the winding core 21 so that the interval H2 becomes maximum at a position different from the middle position between the corners C1 and C3 .

[0095] In the predetermined portion 51 , the first wire 31 and the second wire 41 may be wound around the winding core 21 so that the interval H3 becomes maximum at a position different from the middle position between the corners C2 and C4 .

[0096] In the predetermined portion 51 , the first wire 31 and the second wire 41 may be wound around the winding core 21 so that the interval H4 becomes maximum at a position different from the middle position between the corners C3 and C4 .

[0097] In the prescribed portion 51, as long as the interval H1 is maximized at the midpoint between the corners C1 and C2 in a local portion in the axial direction Z1, the interval H1 may be maximized at a position other than the midpoint between the corners C1 and C2 in other portions of the prescribed portion 51.

[0098] In the prescribed portion 51, as long as the interval H2 is maximized at the midpoint between the corners C1 and C3 in a local portion in the axial direction Z1, the interval H2 may be maximized at a position other than the midpoint between the corners C1 and C3 in other portions of the prescribed portion 51.

[0099] In the prescribed portion 51, as long as the interval H3 is maximized at the middle position between the corners C2 and C4 in a local area in the axial direction Z1, the interval H3 may be maximized at a position other than the middle position between the corners C2 and C4 in other parts of the prescribed portion 51.

[0100] In the prescribed portion 51, as long as the interval H4 is maximized at the middle position between the corners C3 and C4 in a local area in the axial direction Z1, the interval H4 may be maximized at a position other than the middle position between the corners C3 and C4 in other parts of the prescribed portion 51.

[0101] In the above-described embodiments, the winding core 21 has a rectangular cross section when cut in a direction perpendicular to the axial direction Z1 , but the present invention is not limited thereto. For example, the winding core 21 may have a square cross section when cut.

[0102] The winding core 21 may not be a quadrangular prism as long as it is a prism shape. For example, the winding core 21 may be a triangular prism shape or a hexagonal prism shape.

[0103] In the above-mentioned embodiments, the winding core 21 is configured such that the shapes of the side surfaces 211 to 214 when the winding core 21 is cut in a direction perpendicular to the axial direction Z1 are linear shapes, but the present invention is not limited thereto. In other words, the cross section of the winding core 21 when the winding core 21 is cut in a direction perpendicular to the axial direction Z1 may have an edge line.

[0104] The coil components 10, 10A, and 10B may include a third wire in addition to the first wire 31 and the second wire 41. In this case, in the overlapping winding region 50, the first wire 31 is wound around the winding core 21, the second wire 41 is wound around the winding core 21 from above the first wire 31, and the third wire is wound around the winding core 21 from above the second wire 41. At this time, by increasing the interval between the second wire 41 and the third wire, the inter-wire capacitance LC generated between the second wire 41 and the third wire can be reduced.

[0105] The coil component does not need to be a common mode choke coil as long as it has a structure in which a plurality of wires are wound around the winding core 21 .

Claims

1. A coil component, characterized in that: have: a core body having a prismatic winding core portion, a first flange portion connected to a first end of the winding core portion in an axial direction of the winding core portion, and a second flange portion connected to a second end of the winding core portion in the axial direction; and a first wire and a second wire, which are wound around the winding core; The winding core has a first side surface, a second side surface connected to the first side surface via a first corner, and a third side surface connected to the first side surface via a second corner. A lapped winding region is provided, wherein the lapped winding region is a region where the first wire is wound around the winding core and the second wire is wound around the winding core from above the first wire. The overlapping winding area has a predetermined portion, and the predetermined portion is a portion where the first wire and the second wire are wound on the winding core so that a gap is provided between a portion of the first wire wound around the first side surface and a portion of the second wire wound around the first side surface. The predetermined portion includes a portion where a distance between a portion of the first wire wrapped around the first side surface and a portion of the second wire wrapped around the first side surface increases as the distance from the first corner approaches a middle position between the first corner and the second corner.

2. A coil component, characterized in that: have: A core body having a quadrangular columnar winding core, a first flange connected to a first end of the winding core in an axial direction of the winding core, and a second flange connected to a second end of the winding core in the axial direction; and a first wire and a second wire, which are wound around the winding core; The winding core has a first side surface, a second side surface connected to the first side surface via a first corner, a third side surface connected to the first side surface via a second corner, and a fourth side surface connected to the second side surface via a third corner and connected to the third side surface via a fourth corner. The shortest distance from the first corner to the second corner is greater than the shortest distance from the first corner to the third corner, and greater than the shortest distance from the second corner to the fourth corner. A lapped winding region is provided, wherein the lapped winding region is a region where the first wire is wound around the winding core and the second wire is wound around the winding core from above the first wire. The overlapping winding area has a predetermined portion, and the predetermined portion is a portion where the first wire and the second wire are wound on the winding core so that a gap is provided between a portion of the first wire wound around the first side surface and a portion of the second wire wound around the first side surface. The prescribed parts include: Winding the first wire and the second wire on the winding core so that the interval between the portion of the first wire wound around the first side surface and the portion of the second wire wound around the first side surface becomes the largest at a middle position between the first corner and the second corner; and The first wire and the second wire are wound on the winding core portion so that the interval between the first wire and the second wire at the middle position between the first corner and the second corner is not only larger than the interval between the first wire and the second wire at the middle position between the first corner and the third corner, but also larger than the interval between the first wire and the second wire at the middle position between the second corner and the fourth corner.

3. The coil component according to claim 1 or 2, characterized in that: Only a portion of the overlapping region in the axial direction is the prescribed portion.

4. The coil component according to claim 1 or 2, characterized in that: The entire region of the overlapping area in the axial direction is the prescribed portion.

5. The coil component according to claim 1 or 2, characterized in that: The second wire is located outside the outermost end of the first wire in a radial direction centered on the central axis of the winding core at a middle position of a pair of the corners located at both ends of the side surface of the predetermined portion.

6. The coil component according to claim 1 or 2, characterized in that: At a midpoint between a pair of the corners located at both ends of the side surface of the prescribed portion, a radial distance between an outermost end of the first wire and an innermost end of the second wire is smaller than a diameter of the second wire centered on a central axis of the winding core.

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