Coil components

Abstract

To improve the adhesive strength of a metal terminal, in a coil component.SOLUTION: A coil component comprises a drum core, a first metal terminal 41, and a first wire. The drum core has a winding core part 11, a first flange part 20, and a second flange part. The first flange part 20 is connected with a first end in a direction along a central axis of the winding core part 11. The first metal terminal 41 is attached to the first flange part 20. A first connection end of the first wire is bonded with the first metal terminal 41. The first metal terminal 41 has an adhesive part 410 to be fixed to an outer end surface 20A. The adhesive part 410 has a relative surface 411, and a recess 412 recessed with respect to the relative surface 411 and accommodating an adhesive agent 60. When seen in a direction along the central axis C, an area of a region opposed to the outer end surface 20A, of the recess 412 is equal to or more than an area of the relative surface 411.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] This disclosure relates to coil components.

Background Art

[0002] The coil component described in Patent Document 1 includes a bobbin portion and two flange portions. The bobbin portion is quadrangular prism-shaped. The two flange portions are connected to both ends of the bobbin portion. Each flange portion projects outward from the bobbin portion in a direction orthogonal to the central axis of the bobbin portion. The materials of the bobbin portion and the flange portions are magnetic bodies. These bobbin portion and flange portions constitute the core of the coil component.

[0003] The above coil component includes a plurality of metal terminals and two wires. The ends of each wire are joined to each metal terminal. When the surface of each flange portion opposite to the bobbin portion is defined as the outer end surface, each metal terminal is fixed to the outer end surface of each flange portion with an adhesive.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the coil component described in Patent Document 1, the greater the amount of the adhesive intervening between the metal terminal and the flange portion, the more the improvement in the adhesion strength of the metal terminal to the flange portion can be expected. However, simply increasing the amount of the adhesive only causes the adhesive to overflow to unintended locations when attaching the metal terminal to the flange portion. Therefore, simply increasing the amount of the adhesive does not lead to an improvement in the adhesion strength of the metal terminal.

Means for Solving the Problems

[0006] To solve the above problems, the present invention provides a drum core having a columnar winding core, a first flange connected to a first end in a direction along the central axis of the winding core, and a second flange connected to a second end of the winding core opposite to the first end; a first metal terminal attached to the first flange; and a wire wound around the winding core with its first connecting end joined to the first metal terminal, wherein the direction from the first metal terminal toward the winding core is defined as the inward direction, and the inward direction is defined as When the opposite direction is defined as the outward direction, the first flange portion has an outer end surface facing the outward direction, and the first metal terminal has an adhesive portion fixed to the outer end surface, the adhesive portion having a relative surface facing the outer end surface from the outward direction, and a recess recessed relative to the relative surface and containing adhesive, and when viewed in the direction along the central axis, the area of ​​the region of the recess facing the outer end surface is greater than or equal to the area of ​​the relative surface, which is a coil component.

[0007] In the above configuration, the sum of the area of ​​the recess facing the outer end surface and the area of ​​the relative surface is the area of ​​the region of the first metal terminal facing the outer end surface of the first flange. With the above configuration, the area of ​​the recess facing the outer end surface occupies more than half of the area of ​​the first metal terminal facing the outer end surface of the first flange. By providing the recess over a wide area in this way, even if a large amount of adhesive is applied, it is possible to prevent the adhesive from spilling out of the recess. Furthermore, since a large amount of adhesive can be contained within the recess, an improvement in the adhesive strength of the first metal terminal to the first flange can be expected. [Effects of the Invention]

[0008] To improve the adhesive strength of metal terminals in coil components. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view of a coil component. [Figure 2] Figure 2 is a plan view of the coil component. [Figure 3]Figure 3 is a side view of the coil component near the first metal terminal. [Figure 4] Figure 4 is a perspective view of the vicinity of the first metal terminal in the coil component. [Figure 5] Figure 5 is a front view of the coil component near the first metal terminal. [Figure 6] Figure 6 is a front view of the first metal terminal in the coil component. [Figure 7] Figure 7 shows a portion of the end view of line 7-7 in Figure 2. [Figure 8] Figure 8 shows an example of a modification to the adhesive joint of a coil component. [Modes for carrying out the invention]

[0010] The following describes one embodiment of a coil component. Note that the drawings may be enlarged to facilitate understanding of the components. The dimensional ratios of the components may differ from those shown in the actual diagram or in other diagrams.

[0011] <About the overall structure> As shown in Figure 1, the coil component 10 comprises a drum core 10C and a top plate 12.

[0012] The drum core 10C has a winding core portion 11, a first flange portion 20, and a second flange portion 30. The core portion 11 is shaped like a rectangular prism. The material of the core portion 11 is a non-conductive material. Specifically, the material of the core portion 11 can be, for example, alumina, Ni-Zn ferrite, resin, or mixtures thereof.

[0013] The first flange portion 20 is connected to the first end of the winding core portion 11 in the direction along the central axis C. The second flange portion 30 is connected to the second end of the winding core portion 11 in the direction along the central axis C. The material of the first flange portion 20 and the second flange portion 30 is the same non-conductive material as the winding core portion 11. Furthermore, the first flange portion 20 and the second flange portion 30 are integrally molded with the winding core portion 11.

[0014] Here, a specific axis orthogonal to the central axis C is defined as the first axis X. In the present embodiment, when viewed in the direction along the central axis C, the first axis X is parallel to two of the four sides of the core portion 11. Further, an axis orthogonal to both the central axis C and the first axis X is defined as the second axis Y. Furthermore, in the present embodiment, an axis parallel to the central axis C is defined as the third axis Z. Then, one of the directions along the first axis X is defined as the first positive direction X1, and the direction opposite to the first positive direction X1 is defined as the first negative direction X2. Similarly, one of the directions along the second axis Y is defined as the second positive direction Y1, and the direction opposite to the second positive direction Y1 is defined as the second negative direction Y2. Also, one of the directions along the third axis Z is defined as the third positive direction Z1, and the direction opposite to the third positive direction Z1 is defined as the third negative direction Z2. In the present embodiment, the direction from the core portion 11 toward the first flange portion 20 is defined as the third positive direction Z1, and the direction from the core portion 11 toward the second flange portion 30 is defined as the third negative direction Z2.

[0015] The first flange portion 20 protrudes outward with respect to the core portion 11 in the direction along the first axis X and in the direction along the second axis Y. The first flange portion 20 has a symmetric shape in the direction along the second axis Y. The first flange portion 20 has an outer end face 20A. The outer end face 20A is a face that faces the third positive direction Z1 side among the outer faces of the first flange portion 20.

[0016] The first flange portion 20 has a main body portion 21 and a protruding portion 22. The main body portion 21 is, as a whole, a flat quadrangular prism shape in the direction along the third axis Z. When viewed in the third negative direction Z2, the edge on the first negative direction X2 side of the main body portion 21 is parallel to the second axis Y. Also, when viewed in the third negative direction Z2, the edge on the first positive direction X1 side of the main body portion 21 is parallel to the second axis Y. Therefore, the main body portion 21 has an upper face 21A that faces the first positive direction X1 side.

[0017] The protruding portion 22 protrudes from the upper face 21A of the main body portion 21 toward the first positive direction X1 side. The protruding portion 22 has a frustum of a quadrangular pyramid shape in which the dimension in the direction along the second axis Y decreases as it goes toward the first positive direction X1. The protruding portion 22 is located approximately at the center in the direction along the second axis Y of the main body portion 21. The dimension of the protruding portion 22 in the direction along the third axis Z is the same as the dimension of the main body portion 21 in the direction along the third axis Z.

[0018] The protruding portion 22 has an upper end surface 22A and two side surfaces 22B. The upper end surface 22A is the surface facing the first positive direction X1 among the outer surfaces of the protruding portion 22. Each side surface 22B is a surface connecting the upper end surface 22A and the upper surface 21A of the main body portion 21. One of the side surfaces 22B faces the second positive direction Y1. The other one of the side surfaces 22B faces the second negative direction Y2. Note that the main body portion 21 and the protruding portion 22 are integrally formed objects. That is, inside the first flange portion 20, there is no clear boundary between the main body portion 21 and the protruding portion 22.

[0019] The second flange portion 30 has a symmetrical shape with the first flange portion 20 in the direction along the third axis Z. That is, the second flange portion 30 protrudes outward with respect to the core portion 11 in the direction along the first axis X and the direction along the second axis Y. And the second flange portion 30 has an outer end surface 30A. The outer end surface 30A is the surface facing the third negative direction Z2 among the outer surfaces of the second flange portion 30. The second flange portion 30 has a main body portion 31 and a protruding portion 32. The configurations of the main body portion 31 and the protruding portion 32 are the same as those of the main body portion 21 and the protruding portion 22 of the first flange portion 20. That is, the main body portion 31 has an upper surface 31A facing the first positive direction X1. The protruding portion 32 has an upper end surface 32A and two side surfaces 32B.

[0020] In the present embodiment, the maximum dimension in the direction along the first axis X of the drum core 10C is 1.4 mm. Also, the maximum dimension in the direction along the second axis Y of the drum core 10C is 2.5 mm. Also, the maximum dimension in the direction along the third axis Z of the drum core 10C is 3.2 mm.

[0021] The top plate 12 is rectangular in shape. The top plate 12 is flattened in the direction along the first axis X. The long side of the top plate 12 is parallel to the third axis Z. The short side of the top plate 12 is parallel to the second axis Y. The top plate 12 is located on the first negative direction X2 side with respect to the drum core 10C. The top plate 12 is connected to both the surface of the first flange portion 20 facing the first negative direction X2 and the surface of the second flange portion 30 facing the first negative direction X2. In other words, the top plate 12 is spanned between the first flange portion 20 and the second flange portion 30. The material of the top plate 12 is the same non-conductive material as the drum core 10C.

[0022] The coil component 10 includes a first metal terminal 41, a second metal terminal 42, a third metal terminal 43, and a fourth metal terminal 44. The first metal terminal 41 is attached to the first flange portion 20. The first metal terminal 41 is located on the second positive direction Y1 side with respect to the center of the first flange portion 20 in the direction along the second axis Y. The second metal terminal 42 is attached to the first flange portion 20. The second metal terminal 42 is located on the second negative direction Y2 side with respect to the center of the first flange portion 20 in the direction along the second axis Y. The third metal terminal 43 is attached to the second flange portion 30. The third metal terminal 43 is located on the second positive direction Y1 side with respect to the center of the second flange portion 30 in the direction along the second axis Y. The fourth metal terminal 44 is attached to the second flange portion 30. The fourth metal terminal 44 is located on the second negative direction Y2 side with respect to the center of the second flange portion 30 in the direction along the second axis Y. Details of these first metal terminals 41 to the fourth metal terminals 44 will be described later.

[0023] As shown in Figure 2, the coil component 10 comprises a first wire 51 and a second wire 52. Although not shown in the figure, the first wire 51 has a copper wire and an insulating coating. The insulating coating covers the outer surface of the copper wire. The first wire 51 has a substantially circular shape in a cross section perpendicular to the direction in which the first wire 51 extends. The outer diameter L1 of the first wire 51 is approximately 50 μm.

[0024] The first connection end of the first wire 51 is joined to the first metal terminal 41 by heat crimping. The first wire 51 extends from the first metal terminal 41 toward the ridge of the winding core 11 on the first negative direction X2 side and the second positive direction Y1 side. The first wire 51 is wound around the winding core 11 such that, when viewed toward the third negative direction Z2, it proceeds clockwise toward the third negative direction Z2. The second connection end of the first wire 51, opposite to the first connection end, extends toward the third metal terminal 43 from the ridge of the winding core 11 on the first positive direction X1 side and the second negative direction Y2 side. The second connection end of the first wire 51 is joined to the third metal terminal 43 by heat crimping.

[0025] Thermocompression is a method of fixing a wire to a metal terminal by sandwiching it between a metal terminal and a heated jig, melting the wire as it is fixed to the metal terminal. As a result of this fixing method, the insulating coating is peeled off near the point where the wire connects to the metal terminal, exposing the copper wire.

[0026] The second wire 52 has the same configuration as the first wire 51. That is, the second wire 52 consists of a copper wire and an insulating coating. The outer diameter L1 of the second wire 52 is approximately 50 μm. The first connection end of the second wire 52 is joined to the second metal terminal 42 by heat crimping. The second wire 52 extends from the second metal terminal 42 toward the ridge of the winding core 11 on the first positive direction X1 side and the second positive direction Y1 side. The second wire 52 is wound around the winding core 11 such that, when viewed facing the third negative direction Z2, it proceeds clockwise as it moves toward the third negative direction Z2. The second connection end of the second wire 52, opposite to the first connection end, extends toward the fourth metal terminal 44 from the ridge of the winding core 11 on the first negative direction X2 side and the second negative direction Y2 side. The second connection end of the second wire 52 is joined to the fourth metal terminal 44 by heat crimping.

[0027] <Regarding the first metal terminal> As shown in Figure 6, the first metal terminal 41 has an adhesive portion 410, a connecting portion 420, a mounting portion 430, an extended portion 440, and a joint portion 450. The adhesive portion 410, the connecting portion 420, the mounting portion 430, the extended portion 440, and the joint portion 450 are integrally molded. In other words, there is no clear boundary between these components within the first metal terminal 41.

[0028] In the following explanation, the direction along the central axis C from each metal terminal toward the winding core 11 may be referred to as the inward direction, and the direction opposite to the inward direction may be referred to as the outward direction. For example, the inward direction from the first metal terminal 41 toward the winding core 11 coincides with the third negative direction Z2. And the outward direction, with the first metal terminal 41 as the reference, coincides with the third positive direction Z1.

[0029] <Regarding the adhesive part> As shown in Figure 1, the adhesive portion 410 is roughly plate-shaped. As shown in Figure 7, the adhesive portion 410 is fixed to the outer end surface 20A of the first flange portion 20 via adhesive 60. That is, the adhesive portion 410 is joined to the outer surface of the first flange portion 20 that faces the third positive direction Z1. Thus, the adhesive portion 410 is the portion of the first metal terminal 41 that faces the outer end surface 20A of the first flange portion 20 from the third positive direction Z1 side.

[0030] As shown in Figure 6, the adhesive portion 410 has a relative surface 411 and a recess 412. As shown in Figure 7, the relative surface 411, excluding the recess 412, is the surface facing the outer end surface 20A from the third positive direction Z1 side. In other words, the relative surface 411 of the first metal terminal 41 is the surface facing the third negative direction Z2.

[0031] As shown in Figure 6, the adhesive portion 410 has a wide portion 410A and a narrow portion 410B. The wide portion 410A is a part of the adhesive portion 410 that includes the end in the first negative direction X2. When viewed in the third positive direction Z1, the wide portion 410A is roughly rectangular in shape, with two adjacent corners on the first negative direction X2 side being chamfered. The dimension of the wide portion 410A in the direction along the second axis Y is approximately constant, except for the chamfered portion. The wide portion 410A includes the portion of the relative surface 411 and recess 412 that has the largest dimension in the direction along the second axis Y.

[0032] The narrow section 410B is adjacent to the wide section 410A on the first positive direction X1 side. Specifically, the narrow section 410B extends from the end of the wide section 410A in the second negative direction Y2 to the first positive direction X1. In Figure 6, the boundary between the narrow section 410B and the wide section 410A is virtually shown by a dashed line. The dimensions of the narrow section 410B in the direction along the second axis Y are smaller than those of the wide section 410A. The dimensions of the narrow section 410B in the direction along the second axis Y are less than half of the dimensions of the wide section 410A in the direction along the second axis Y. The dimensions of the narrow section 410B in the direction along the second axis Y are approximately constant, except for the connection portion with the wide section 410A.

[0033] As shown in Figure 7, the recess 412 is recessed relative to the opposing surface 411. The recess 412 contains adhesive 60. However, the adhesive 60 is not contained in a portion of the recess 412, including the end in the first positive direction X1.

[0034] As shown in Figure 6, the recess 412 is located across the wide portion 410A and the narrow portion 410B. The end 431 of the recess 412 on the first negative direction X2 side is located on the first positive direction X1 side with respect to the end of the adhesive portion 410 on the first negative direction X2 side. In other words, the recess 412 is not open toward the end of the adhesive portion 410 on the first negative direction X2 side. Also, as shown in Figure 7, the end 431 of the recess 412 on the first negative direction X2 side is located on the first negative direction X2 side when viewed from the central axis C.

[0035] The end 432 on the first positive direction X1 side of the recess 412 is located on the first negative direction X2 side with respect to the end of the adhesive portion 410 on the first positive direction X1 side. In other words, the end 432 on the first positive direction X1 side of the recess 412 is located on the first negative direction X2 side when viewed from the upper end surface 22A of the first flange portion 20. Also, as shown in Figure 7, the end 432 on the first positive direction X1 side of the recess 412 is located on the first positive direction X1 side when viewed from the end of the winding core portion 11 on the first positive direction X1 side.

[0036] As shown in Figure 6, the recess 412 in the narrow section 410B extends across the entire narrow section 410B in the direction along the second axis Y. Similarly, the recess 412 in the wide section 410A extends across the entire wide section 410A in the direction along the second axis Y. That is, in the direction along the second axis Y, the maximum dimension of the recess 412 located in the wide section 410A is greater than the maximum dimension of the recess 410B.

[0037] The edge of the recess 412 on the first negative direction X2 side is approximately parallel to the second axis Y. Also, the edge of the recess 412 on the first positive direction X1 side is approximately parallel to the second axis Y. The distance from the edge of the recess 412 on the first negative direction X2 side to the boundary line between the wide portion 410A and the narrow portion 410B is larger than the distance from the boundary line between the wide portion 410A and the narrow portion 410B to the edge of the recess 412 on the first positive direction X1 side. In other words, the area of ​​the portion of the recess 412 located in the wide portion 410A is larger than the area of ​​the portion of the recess 412 located in the narrow portion 410B. In this embodiment, the dimensional ratio of the wide portion 410A to the narrow portion 410B is approximately 5:2. Note that the dimension of the wide portion 410A in the direction along the second axis Y is smaller than the dimension of the drum core 10C in the direction along the second axis Y. In other words, the dimensions of the wide section 410A are 2.5 mm or less.

[0038] The dimension of the recess 412 in the direction along the third axis Z, i.e., the depth of the recess 412, is substantially constant except for the edge of the recess 412. In this embodiment, the depth of the recess 412 is approximately half the thickness of the adhesive portion 410. For example, the thickness of the adhesive portion 410 is 0.2 mm, and the depth of the recess 412 is 0.1 mm. Therefore, reflecting the difference in area described above, the volume V1 of the portion of the recess 412 located in the wider portion 410A is larger than the volume V2 of the portion of the recess 412 located in the narrower portion 410B.

[0039] As shown in Figure 7, the region comprising the relative surface 411 and the recess 412, that is, the region facing the outer end surface 20A of the first flange portion 20 of the first metal terminal 41, is defined as the opposing region P. As shown in Figure 6, when viewed in the direction along the central axis C, the area of ​​the region of the recess 412 facing the outer end surface 20A of the first flange portion 20 is at least half the area of ​​the opposing region P. In other words, the area of ​​the region of the recess 412 facing the outer end surface 20A of the first flange portion 20 is greater than or equal to the area of ​​the relative surface 411. Also, as shown in Figure 7, the maximum dimension L3 of the recess 412 in the direction along the first axis X is at least half the maximum dimension L4 of the opposing region P in the direction along the first axis X. Note that "when viewed in the direction along the central axis C" is not limited to what can be directly seen, but also includes what is seen through light as described above.

[0040] <Regarding the connecting section> As shown in Figure 7, the connecting portion 420 is connected to the end of the adhesive portion 410 in the first positive direction X1. In Figure 6, the boundary between the connecting portion 420 and the adhesive portion 410 is virtually shown by a dashed line. The connecting portion 420 extends from the adhesive portion 410 toward the first positive direction X1. That is, when viewed in the direction along the third axis Z, the connecting portion 420 protrudes from the first flange portion 20 in the direction along the first axis X. Specifically, the connecting portion 420 protrudes toward the first positive direction X1 side relative to the upper end surface 22A of the first flange portion 20. The connecting portion 420 bends by approximately 90 degrees midway. The end of the connecting portion 420 opposite to the adhesive portion 410 faces the third negative direction Z2.

[0041] <About the implementation section> As shown in Figure 4, the mounting portion 430 is connected to the end of the connecting portion 420 opposite to the adhesive portion 410. The mounting portion 430 is flat. The main surface of the mounting portion 430 is perpendicular to the first axis X. The mounting portion 430 is the part of the first metal terminal 41 that is located furthest towards the first positive direction X1. The mounting portion 430 is separated from the upper end surface 22A of the first flange portion 20 toward the first positive direction X1. In other words, there is a gap between the mounting portion 430 and the upper end surface 22A. The mounting portion 430 is also separated from all outer surfaces of the drum core 10C, including the upper end surface 22A. The mounting portion 430 is the part that faces the substrate when the coil component 10 is mounted on the substrate.

[0042] As shown in Figure 5, the shortest distance W1 from the mounting portion 430 to the upper end surface 22A in the direction along the first axis X is greater than the minimum dimension W2 of the mounting portion 430 in the direction along the first axis X. In this embodiment, the dimension of the mounting portion 430 in the direction along the first axis X is the thickness of the first metal terminal 41. This thickness is approximately constant. The thickness of the first metal terminal 41 is approximately constant in the adhesive portion 410, connecting portion 420, mounting portion 430, and extended portion 440, excluding the recess 412.

[0043] <Regarding the extension> As shown in Figure 4, the extension portion 440 is connected to the end of the mounting portion 430 on the second positive direction Y1 side. The extension portion 440 extends diagonally from the mounting portion 430 toward the second positive direction Y1 and toward the first negative direction X2. The dimension of the extension portion 440 in the direction along the third axis Z, i.e., the width dimension of the extension portion 440, is approximately constant. As shown in Figure 5, when viewed in the direction along the third axis Z, the extension portion 440 extends toward the side surface 22B of the projection portion 22 facing the second positive direction Y1 as it moves toward the first negative direction X2. The surface of the extension portion 440 facing the second negative direction Y2 is in line contact with the side surface 22B of the projection portion 22. If the extension portion 440 does not have a surface parallel to the side surface 22B, the extension portion 440 will be in line contact with the side surface 22B.

[0044] As shown in Figure 5, specifically, when viewed facing the third positive direction Z1, the angle formed by the side surface 22B and the top surface 21A, which is on the side of the second positive direction Y1 and the side of the first positive direction X1, is defined as the first angle θ1. The extension portion 440 also has a linearly extending portion. The angle formed by the imaginary line VL0 passing through the center of this linearly extending portion and the top surface 21A, which is on the side of the second positive direction Y1 and the side of the first positive direction X1, is defined as the second angle θ2. In this case, the second angle θ2 is smaller than the first angle θ1.

[0045] <Regarding the joint> As shown in Figure 4, the joint 450 is connected to the end of the extension 440 on the first negative direction X2 side. The joint 450 is generally plate-shaped. When viewed in the direction along the first axis X, the joint 450 is a roughly rectangular shape with its length in the direction of the third axis Z. As shown in Figure 3, the maximum dimension W4 of the joint 450 in the direction along the third axis Z is greater than the maximum dimension W3 of the extension 440 in the direction along the third axis Z, i.e., the width dimension of the extension 440.

[0046] As shown in Figure 4, the joint portion 450 faces the upper surface 21A of the first flange portion 20 from the first positive direction X1 side. The surface of the joint portion 450 facing the first negative direction X2 is in contact with the upper surface 21A. On the other hand, the surface of the joint portion 450 facing the first negative direction X2 is not fixed to the upper surface 21A. In other words, the adhesive 60, etc., is not interposed between the surface of the joint portion 450 facing the first negative direction X2 and the upper surface 21A.

[0047] When viewed in a direction along the first axis X, the joint portion 450 does not protrude from the upper surface 21A of the first flange portion 20 in the third negative direction Z2. That is, the end of the upper surface 21A of the first flange portion 20 on the third negative direction Z2 side is located on the third negative direction Z2 side relative to the end of the joint portion 450 on the third negative direction Z2 side.

[0048] The joint 450 has a horizontal surface 451 and an inclined surface 452. The horizontal surface 451 faces the first positive direction X1. The horizontal surface 451 is the outer surface of the joint 450 that is located closest to the third positive direction Z1. When viewed in the direction along the first axis X, the horizontal surface 451 is approximately rectangular in shape.

[0049] The inclined surface 452 further has a first inclined surface 452A and a second inclined surface 452B. The first inclined surface 452A is a plane facing the first positive direction X1 and the third negative direction Z2. The first inclined surface 452A is adjacent to the horizontal plane 451 on the third negative direction Z2 side. The first inclined surface 452A is located closer to the first negative direction X2 as it moves towards the third negative direction Z2.

[0050] The second inclined surface 452B is a plane facing the first positive direction X1 and the third negative direction Z2. The second inclined surface 452B is adjacent to the first inclined surface 452A on the third negative direction Z2 side. The second inclined surface 452B is located closer to the first negative direction X2 as it approaches the third negative direction Z2. The second inclined surface 452B extends to the end of the joint 450 on the third negative direction Z2 side.

[0051] As shown in Figure 3, when viewed in the direction along the second axis Y, suppose a virtual line VL1 is drawn passing through the end E1 on the third positive direction Z1 side of the first inclined surface 452A and parallel to the central axis C. Let angle P1 be the acute angle formed between the first inclined surface 452A and the virtual line VL1. Also, when viewed in the direction along the second axis Y, suppose a virtual line VL2 is drawn passing through the end E2 on the third negative direction Z2 side of the second inclined surface 452B and parallel to the central axis C. Let angle P2 be the acute angle formed between the second inclined surface 452B and the virtual line VL2. In this case, angle P2 is larger than angle P1.

[0052] Note that both the first inclined surface 452A and the second inclined surface 452B are planes. Therefore, the tangent line at the end E1 on the third positive direction Z1 side of the first inclined surface 452A is a line extending along the first inclined surface 452A. Similarly, the tangent line at the end E2 on the third negative direction Z2 side of the second inclined surface 452B is a line extending along the second inclined surface 452B.

[0053] Furthermore, the distance L2 along the first axis X from end E1 of the third positive direction Z1 on the inclined surface 452 to end E2 of the third negative direction Z2 on the inclined surface 452 is approximately 70 μm. In other words, the distance L2 along the first axis X from end E1 of the third positive direction Z1 on the inclined surface 452 to end E2 of the third negative direction Z2 on the inclined surface 452 is larger than the outer diameter L1 of the first wire 51.

[0054] <Regarding the second metal terminal 42 to the fourth metal terminal 44> As shown in Figure 1, the second metal terminal 42 has a shape that is inverted from that of the first metal terminal 41 in the direction along the second axis Y. The second metal terminal 42 is joined to the outer end surface 20A of the first flange portion 20 at the adhesive portion 410, similar to the first metal terminal 41. The third metal terminal 43 has the same shape as the second metal terminal 42. The third metal terminal 43 is joined to the outer end surface 30A of the second flange portion 30 at the adhesive portion 410. The fourth metal terminal 44 has the same shape as the first metal terminal 41. The fourth metal terminal 44 is joined to the outer end surface 30A of the second flange portion 30 at the adhesive portion 410.

[0055] <Regarding the connection between the first wire and the joint> When joining the first wire 51 to the joint 450, the first connecting end of the first wire 51 is placed on the horizontal plane 451, and a jig is pressed against the horizontal plane 451 parallel to it. The jig is a heater tip. The jig comes into contact with the first wire 51 on the horizontal plane 451 and with a portion of the first wire 51 on the third positive direction Z1 side of the first inclined surface 452A. Upon contact with the jig, the insulating coating on the first wire 51 melts. That is, the insulating coating is peeled off all of the first wire 51 on the horizontal plane 451 and with a portion of the first wire 51 on the first inclined surface 452A, exposing the copper wire. Also, during thermocompression, the first wire 51 on the horizontal plane 451 is crushed and flattened by the load from the jig. Similarly, a portion of the first wire 51 on the third positive direction Z1 side of the first inclined surface 452A that the jig contacts becomes flattened. During the heat-sealing process described above, some of the first wires 51 on the first inclined surface 452A and the first wires 51 on the second inclined surface 452B, which do not come into contact with the jig, retain their insulating coating. Also, the first wires 51 on the second inclined surface 452B are not flattened because they do not come into contact with the jig.

[0056] <Regarding the operation of this embodiment> When attaching the first metal terminal 41 to the first flange portion 20, first, adhesive 60 is applied to the outer end surface 20A. Then, the opposing surface 411 is brought into contact with the outer end surface 20A so that the adhesive 60 is contained within the recess 412 of the first metal terminal 41. Note that the first positive direction X1 side of the recess 412 is positioned so that the adhesive 60 does not adhere to it and it is hollow. In this way, the first metal terminal 41 is attached to the first flange portion 20.

[0057] <Effects of this embodiment> The effects of this embodiment will now be described. While the effects of the first metal terminal 41 will be described as representative, similar effects can be achieved with each metal terminal.

[0058] (1) According to the above embodiment, the area of ​​the recess 412 facing the outer end surface 20A is greater than or equal to the area of ​​the relative surface 411. By providing the recess 412 over a wide area in this way, even if a large amount of adhesive 60 is applied, it is possible to prevent the adhesive 60 from spilling out of the recess 412. Furthermore, since a large amount of adhesive 60 can be contained within the recess 412, an improvement in the adhesive strength of the first metal terminal 41 to the first flange portion 20 can be expected.

[0059] (2) In the above embodiment, the joint portion 450 is located on the second positive direction Y1 side relative to the end of the narrow portion 410B on the second positive direction Y1 side. Also, in the above embodiment, the mounting portion 430 is located on the second negative direction Y2 side relative to the end of the recess 412 on the second positive direction Y1 side. Therefore, when the first wire 51 is crimped to the joint portion 450 and when the mounting portion 430 is attached to the substrate, a rotational force with the central axis C of the winding core portion 11 as the center of rotation may act on the first metal terminal 41. According to the above embodiment, the maximum dimension of the recess 412 of the wide portion 410A in the direction along the second axis Y is greater than the maximum dimension of the narrow portion 410B in the direction along the second axis Y. That is, the recess 412 exists over a considerable length in the direction along the second axis Y. Therefore, even if the above rotational force acts on the first metal terminal 41, it is possible to suppress the first metal terminal 41 from tilting with respect to the second axis Y.

[0060] (3) According to the above embodiment, the volume V1 of the portion of the recess 412 located in the wider portion 410A is larger than the volume V2 of the portion of the recess 412 located in the narrower portion 410B. With this configuration, a large amount of adhesive 60 can be contained in the portion of the recess 412 located in the wider portion 410A. Therefore, even when a rotational force is applied with the central axis C as the center of rotation, as described above, the effect of preventing the first metal terminal 41 from tilting with respect to the second axis Y can be more reliably achieved.

[0061] (4) According to the above embodiment, the recess 412 extends over the entire width portion 410A in the direction along the second axis Y. With this configuration, more adhesive 60 can be contained in the width portion 410A compared to a configuration in which the recess 412 does not extend over the entire width portion 410A in the direction along the second axis Y. Therefore, even when a rotational force with the central axis C as the center of rotation is applied, as described above, the effect of preventing the first metal terminal 41 from tilting with respect to the second axis Y can be more reliably achieved.

[0062] (5) In the above embodiment, the mounting portion 430 is located on the first positive direction X1 side with respect to the recess 412. Therefore, when the mounting portion 430 is attached to the substrate, a rotational force may act on the first metal terminal 41 with an axis parallel to the second axis Y as the center of rotation. In the above embodiment, the maximum dimension L3 of the recess 412 in the direction along the first axis X is at least half the maximum dimension L4 of the opposing region P in the direction along the first axis X. With this configuration, the recess 412 is provided over a considerable range in the direction along the first axis X. Therefore, even if the rotational force described above acts on the end of the first metal terminal 41, the first metal terminal 41 is less likely to peel off from the first flange portion 20.

[0063] (6) In the above embodiment, the end 432 on the first positive direction X1 side of the recess 412 is located on the first negative direction X2 side when viewed from the end on the first positive direction X1 side of the first flange portion 20. Therefore, the adhesive 60 contained in the recess 412 is contained between the first flange portion 20 and the recess 412. That is, the adhesive 60 is unlikely to reach the upper end surface 22A of the first flange portion 20. And if there is no adhesive 60 on the upper end surface 22A, the mounting portion 430 of the first metal terminal 41 will not be unintentionally joined to the upper end surface 22A.

[0064] Furthermore, the end 432 on the first positive direction X1 side of the recess 412 is located on the first positive direction X1 side when viewed from the end on the first positive direction X1 side of the winding core 11. Therefore, even if a rotational force with the second axis Y as the center of rotation acts on the end of the first metal terminal 41, the first metal terminal 41 is less likely to peel off from the first flange 20.

[0065] (7) In the above embodiment, the end 431 of the recess 412 on the first negative direction X2 side is located in the first negative direction X2 when viewed from the central axis C. That is, with this configuration, the recess 412 is provided over a considerable range in the direction along the first axis X. Therefore, even if a rotational force with the second axis Y as the center of rotation acts on the end of the first metal terminal 41, the first metal terminal 41 is less likely to peel off from the first flange portion 20.

[0066] (8) In the above embodiment, the adhesive 60 is not contained in part of the recess 412, including the end 432 in the first positive direction X1. With this configuration, the adhesive 60 is less likely to leak out of the recess 412 because there is space in the recess 412 where the adhesive 60 is not contained. In particular, the adhesive 60 is less likely to leak out of the recess 412 in the first positive direction X1. Therefore, the adhesive 60 is less likely to reach the upper end surface 22A of the first flange portion 20.

[0067] <Example of changes> This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically. Regarding modifications common to the first metal terminals 41 to the fourth metal terminals 44, only the first metal terminal 41 will be described as a representative example.

[0068] • In the above embodiment, the configuration of the coil component 10 is not limited. For example, the top plate 12 can be omitted from the coil component 10. Also, the shape of the first flange portion 20 is not limited to the shape of the above embodiment. For example, the protruding portion 22 can be omitted from the first flange portion 20.

[0069] In the above embodiment, the coil component 10 may omit the second wire 52. For example, if the coil component 10 only has the first wire 51, it is sufficient that one metal terminal is attached to each flange portion.

[0070] In the above embodiment, the core portion 11 does not have to be a rectangular prism. For example, the cross-sectional shape of the core portion 11 may be circular, elliptical, or a polygon other than a rectangle. In the above embodiment, the shape of the first metal terminal 41 is not limited to the example of the above embodiment. The first metal terminal 41 only needs to have a relative surface 411 and a recess 412.

[0071] In the above embodiment, the joint 450 may be separated from the upper surface 21A. Furthermore, adhesive 60 may be contained between the joint 450 and the upper surface 21A. In the above embodiment, there does not need to be a clear boundary between the first inclined surface 452A and the second inclined surface 452B in the joint 450. That is, the inclination angle of the inclined surface 452 may change gradually.

[0072] In the above embodiment, the configuration of the joint 450 is not limited to the example of the above embodiment. For example, the joint 450 may have a second horizontal surface in addition to the horizontal surface 451.

[0073] In the above embodiment, the joint 450 may omit the horizontal surface 451. That is, the joint 450 may consist only of the inclined surface 452. In that case, it is preferable that the first wire 51 is joined to the inclined surface 452 at the portion of the inclined surface 452 that is closer to the outer side. In addition, the joint 450 may have further inclined surfaces in addition to the first inclined surface 452A and the second inclined surface 452B.

[0074] In the above embodiment, the angle P2 of the inclined surface 452 at the joint 450 may be smaller than the angle P1. In the above embodiment, the inclined surface 452 in the joint 450 may consist of only one inclined surface. Furthermore, the inclined surface may be a curved surface instead of a flat surface. Also, in the above embodiment, the joint 450 may not have an inclined surface 452 and may consist only of a horizontal surface 451.

[0075] In the above embodiment, the end of the upper surface 21A on the third negative direction Z2 side may be located on the third positive direction Z1 side relative to the end of the joint portion 450 on the third negative direction Z2 side. That is, the joint portion 450 may protrude from the first flange portion 20.

[0076] In the above embodiment, the distance L2 in the direction along the first axis X from the end E1 of the inclined surface 452 in the third positive direction Z1 to the end E2 of the inclined surface 452 in the third negative direction Z2 may be less than or equal to the outer diameter L1 of the first wire 51.

[0077] In the above embodiment, the maximum dimension W3 of the extended portion 440 in the direction along the third axis Z may be larger than or the same as the maximum dimension W4 of the joint portion 450 in the direction along the third axis Z.

[0078] In the above embodiment, the position of the recess 412 is not limited to the example of the above embodiment. That is, the end 432 of the recess 412 on the first positive direction X1 side may be located on the first positive direction X1 side relative to the end of the adhesive portion 410 on the first positive direction X1 side. Also, the end 431 of the recess 412 on the first negative direction X2 side may be located on the first positive direction X1 side when viewed from the central axis C.

[0079] In the above embodiment, the positional relationship between the fixing point of the first wire 51 on the first metal terminal 41 and the recess 412 is not limited to the example of the above embodiment. For example, in the example shown in Figure 8, the end of the second positive direction Y1 on the wide portion 410A of the first metal terminal 41 is in the same position as the end of the second positive direction Y1 on the joint portion 450 in the direction along the second axis Y. Therefore, the first connecting end of the first wire 51 joined to the joint portion 450 is located within the range where the recess 412 exists in the direction along the second axis Y. With this configuration, even if a rotational force with the central axis C as the center of rotation is applied due to the load when crimping the first wire 51 to the joint portion 450, it is possible to suppress the first metal terminal 41 from tilting with respect to the second axis Y.

[0080] In the above embodiment, the dimensions of the adhesive portion 410 may be constant in the direction along the second axis Y. That is, the adhesive portion 410 does not necessarily have to be broadly divided into a wide portion 410A and a narrow portion 410B.

[0081] In the above embodiment, the recess 412 does not have to extend over the entire width of the wide portion 410A in the direction along the second axis Y. Similarly, the recess 412 does not have to extend over the entire width of the narrow portion 410B in the direction along the second axis Y. Furthermore, the volume V1 of the portion of the recess 412 located in the wide portion 410A may be smaller than or the same as the volume V2 of the portion of the recess 412 located in the narrow portion 410B.

[0082] In the above embodiment, the maximum dimension L3 of the recess 412 in the direction along the first axis X may be less than half the maximum dimension L4 of the opposing region P. In the above embodiment, the adhesive 60 may be contained in the recess 412 up to the end 432 of the first positive direction X1. Alternatively, the adhesive 60 may extend to the relative surface 411 and the connecting portion 420.

[0083] In the above embodiment, the mounting portion 430 may be in contact with the upper end surface 22A of the protruding portion 22. That is, the mounting portion 430 may be in contact with the outer surface of the drum core 10C. Also, adhesive 60 may be applied between the mounting portion 430 and the protruding portion 22.

[0084] In the above embodiment, the shortest distance W1 from the mounting portion 430 to the upper end surface 22A may be smaller than or the same as the minimum dimension W2 of the mounting portion 430 in the direction along the first axis X.

[0085] In the above embodiment, the extended portion 440 does not have to be in contact with the side surface 22B. Also, the extended portion 440 may extend away from the side surface 22B as it moves toward the first negative direction X2.

[0086] The technical concepts that can be derived from the above embodiments and modifications are described below. [1] A coil component comprising: a drum core having a columnar winding core portion, a first flange portion connected to a first end of the winding core portion in a direction along the central axis, and a second flange portion connected to a second end of the winding core portion opposite to the first end; a first metal terminal attached to the first flange portion; and a wire wound around the winding core portion with a first connecting end joined to the first metal terminal, wherein, when the direction from the first metal terminal toward the winding core portion is defined as the inward direction and the direction opposite to the inward direction is defined as the outward direction, the first flange portion has an outer end surface facing the outward direction, the first metal terminal has an adhesive portion fixed to the outer end surface, the adhesive portion has a relative surface facing the outer end surface from the outward direction side, and a recess recessed relative to the relative surface and containing adhesive, and when viewed in the direction along the central axis, the area of ​​the region of the recess facing the outer end surface is greater than or equal to the area of ​​the relative surface.

[0087] [2] When a specific axis perpendicular to the central axis is defined as the first axis, and an axis perpendicular to both the central axis and the first axis is defined as the second axis, the first metal terminal has a wide portion and a narrow portion adjacent to the wide portion in the direction along the first axis and having a smaller dimension in the direction along the second axis than the wide portion, the recess is located in the wide portion and the narrow portion, and in the direction along the second axis, the maximum dimension of the recess located in the wide portion is greater than the maximum dimension of the narrow portion [1].

[0088] [3] The coil component according to [2], wherein the volume of the portion of the recess located in the wider part of the recess is greater than the volume of the portion of the recess located in the narrow part of the recess. [4] The coil component according to [2] or [3], wherein the recess extends over the entire width portion in the direction along the second axis.

[0089] [5] When a specific axis perpendicular to the central axis is defined as the first axis, the first metal terminal has a connecting portion that is connected to the adhesive portion and protrudes from the first flange portion in a direction along the first axis, and when the region formed by combining the relative surface and the recess is defined as the opposing region, the maximum dimension of the recess in the direction along the first axis is at least half the maximum dimension of the opposing region in the direction along the first axis, as described in any one of [1] to [4].

[0090] [6] A coil component according to any one of [1] to [5], wherein a specific axis perpendicular to the central axis is defined as the first axis, one of the directions along the first axis is defined as the first positive direction, and the direction opposite to the first positive direction is defined as the first negative direction, the first metal terminal has a connecting portion that is connected to the adhesive portion and protrudes from the first flange portion in the direction along the first axis, the end of the recess on the first positive direction side is located on the first negative direction side when viewed from the end of the first positive direction side of the first flange portion, and is located on the first positive direction side when viewed from the end of the winding core portion, and the end of the recess on the first negative direction side is located in the first negative direction when viewed from the central axis.

[0091] [7] When a specific axis perpendicular to the central axis is defined as the first axis and a specific axis perpendicular to the central axis is defined as the second axis, the first metal terminal has a connecting portion that is connected to the adhesive portion and protrudes from the first flange portion in the direction along the first axis, and the first connecting end of the wire is located within the range in which the recess exists in the direction along the second axis, the coil component according to any one of [1] to [6].

[0092] [8] A coil component according to any one of [1] to [7], wherein a specific axis perpendicular to the central axis is defined as the first axis, and one of the directions along the first axis is defined as the first positive direction, the first metal terminal has a connecting portion that is connected to the adhesive portion and protrudes from the first flange portion in the direction along the first axis, and the adhesive is not contained in any part of the recess, including the end in the first positive direction. [Explanation of Symbols]

[0093] C…Central axis X…1st axis X1…first positive direction 10…Coil components 10C... Drum core 11…Core section 20...First guard section 20A…outer end surface 30...Second guard section 41...First metal terminal 51…First wire 60…Adhesive 410...Adhesive part 411...Relative surface 412... indentation

Claims

1. A drum core having a columnar winding core, a first flange connected to a first end in the direction along the central axis of the winding core, and a second flange connected to a second end of the winding core opposite to the first end, The first metal terminal attached to the first flange portion, A wire wound around the aforementioned core, with its first connecting end joined to the first metal terminal, Equipped with, When the direction along the central axis is defined as the inward direction from the first metal terminal toward the winding core, and the direction opposite to the inward direction is defined as the outward direction, The first flange portion has an outer end surface facing outward, The first metal terminal has an adhesive portion that is fixed to the outer end face, The adhesive portion has a relative surface facing the outer end surface from the outward direction, and a recess that is recessed relative to the relative surface and contains adhesive. When viewed in a direction along the central axis, the area of ​​the recess facing the outer end surface is greater than or equal to the area of ​​the relative surface. When a specific axis perpendicular to the central axis is designated as the first axis, and an axis perpendicular to both the central axis and the first axis is designated as the second axis, The first metal terminal has a wide portion and a narrow portion adjacent to the wide portion in the direction along the first axis and having a smaller dimension in the direction along the second axis than the wide portion. The aforementioned recess is located across the wide portion and the narrow portion, In the direction along the second axis, the maximum dimension of the recess located in the wider portion is greater than the maximum dimension of the narrower portion. Coil components.

2. The volume of the portion of the recess located in the wider part is greater than the volume of the portion of the recess located in the narrow part. The coil component according to claim 1.

3. The recess extends over the entire width of the wide portion in the direction along the second axis. The coil component according to claim 1.

4. The first metal terminal is connected to the adhesive portion and has a connecting portion that protrudes from the first flange portion in a direction along the first axis. When the region formed by combining the relative surface and the recess is defined as the opposing region, The maximum dimension of the recess in the direction along the first axis is at least half the maximum dimension of the opposing region in the direction along the first axis. The coil component according to claim 1.

5. When one of the directions along the first axis is defined as the first positive direction, and the direction opposite to the first positive direction is defined as the first negative direction, The first metal terminal is connected to the adhesive portion and has a connecting portion that protrudes from the first flange portion in a direction along the first axis. The first positive-direction end of the recess is located on the first negative-direction side when viewed from the first positive-direction end of the first flange portion, and is located on the first positive-direction side when viewed from the first positive-direction end of the winding core portion. The first negative-direction end of the recess is located in the first negative direction when viewed from the central axis. The coil component according to claim 1.

6. The first metal terminal is connected to the adhesive portion and has a connecting portion that protrudes from the first flange portion in a direction along the first axis. The first connecting end of the wire is located within the range where the recess exists in the direction along the second axis. The coil component according to claim 1.

7. When one of the directions along the first axis is designated as the first positive direction, The first metal terminal is connected to the adhesive portion and has a connecting portion that protrudes from the first flange portion in a direction along the first axis. The adhesive is not contained in part of the recess, including the first positive end. The coil component according to claim 1.

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