Coil parts

Abstract

To suppress reduction in mounting strength of a first metal terminal, in a coil component.SOLUTION: A coil component 10 comprises a drum core, a first metal terminal 41, and a first wire. The drum core has a winding core part, 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. 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 flange part 20 is projected outward with respect to the winding core part in a first positive direction X1. The first metal terminal 41 has an adhesive part, a mounting part 430, and a coupling part 420 connecting between the adhesive part and the mounting part 430. The adhesive part is bonded with an outer face of the first flange part 20 via an adhesive agent. The mounting part 430 is located nearest to the first positive direction X1, of the first metal terminal 41. The mounting part 430 is separated from the drum core in the first positive direction X1.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a coil component. [Background technology]

[0002] The coil component described in Patent Document 1 includes a winding core portion and two flange portions. The winding core portion is in the shape of a rectangular prism. The two flange portions are connected to both ends of the winding core portion. Each flange portion protrudes outward from the winding core portion in a first positive direction perpendicular to the central axis of the winding core portion. The winding core portion and the flange portions are made of a magnetic material. The winding core portion and the flange portions form a core of the coil component.

[0003] The coil component includes a plurality of metal terminals and two wires. Each metal terminal has a mounting portion. The mounting portion is located on the furthest side of the metal terminal in the first positive direction. This mounting portion is a portion that comes into contact with a substrate when the coil component is mounted on the substrate. The mounting portion is bonded to the surface of the flange portion facing the first positive direction via an adhesive. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-89804 A Summary of the Invention [Problem to be solved by the invention]

[0005] A coil component as described in Patent Document 1 is mounted on a substrate or the like. At this time, the mounting portion of the metal terminal is joined to the substrate or the like via solder. Here, since the thermal expansion coefficient of the coil component differs from that of the substrate or the like, there is a difference in the degree of thermal deformation between the two. Therefore, as the temperature changes, a force acts on the solder interposed between the mounting portion of the metal terminal and the substrate or the like. This force associated with the temperature change may cause cracks or the like to occur in the solder, which may reduce the joining strength of the coil component to the substrate or the like.

[0006] Although the above describes an example in which the mounting portion of the metal terminal is joined to a substrate or the like via solder, similar problems arise as long as the mounting portion is joined to a substrate or the like regardless of the manner of joining. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a coil component comprising: a columnar winding core portion, a first flange portion connected to a first end in a direction along a central axis of the winding core portion, and a second flange portion connected to a second end of the winding core portion opposite the first end; a first metal terminal attached to the first flange portion; and a wire wound around the winding core portion and having a first connection end joined to the first metal terminal, wherein an axis perpendicular to the central axis is defined as a first axis, and one of the directions along the first axis is defined as a first positive direction, and the first flange portion protrudes outward from the winding core portion in the first positive direction, and the first metal terminal has an adhesive portion joined to the first flange portion via an adhesive, a mounting portion of the first metal terminal located furthest on the first positive direction side, and a connecting portion connecting the adhesive portion and the mounting portion, and the mounting portion is a coil component separated from the drum core toward the first positive direction.

[0008] In the above configuration, when the coil component is mounted on a substrate or the like with the first positive direction facing the substrate or the like, the mounting portion of the first metal terminal is joined to the substrate or the like. Even if a difference in the degree of thermal deformation occurs between the coil component and the substrate or the like when the coil component is mounted on the substrate or the like, the difference can be absorbed by the mounting portion undergoing elastic deformation. As a result, the force caused by the difference in thermal deformation acting between the mounting portion of the first metal terminal and the substrate or the like can be suppressed, and therefore the mounting strength of the coil component to the substrate or the like can be prevented from decreasing. Effect of the Invention

[0009] According to an aspect of the present disclosure, a decrease in mounting strength of a coil component is suppressed. [Brief description of the drawings]

[0010] [Figure 1]FIG. 1 is a perspective view of a coil component. [Diagram 2] FIG. 2 is a plan view of the coil component. [Diagram 3] FIG. 3 is a side view of the coil component near a first metal terminal. [Figure 4] FIG. 4 is a perspective view of the vicinity of a first metal terminal in the coil component. [Diagram 5] FIG. 5 is a front view of the coil device in the vicinity of a first metal terminal. [Figure 6] FIG. 6 is a front view of a first metal terminal in the coil component. [Figure 7] FIG. 7 is a partial end view taken along line 7-7 in FIG. [Figure 8] FIG. 8 is a diagram showing a modified example of the extension portion and the joint portion of the coil component. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of a coil component will be described. In the drawings, components may be shown enlarged to facilitate understanding. The dimensional ratios of the components may differ from those in the actual product or from those in other drawings.

[0012] <Overall structure> As shown in FIG. 1, the coil device 10 includes a drum core 10C and a top plate 12.

[0013] The drum core 10C has a winding core portion 11, a first flange portion 20, and a second flange portion 30. The winding core 11 has a rectangular prism shape. The material of the winding core 11 is a non-conductive material. Specifically, the material of the winding core 11 may be, for example, alumina, Ni-Zn ferrite, resin, a mixture thereof, or the like.

[0014] The first flange portion 20 is connected to a first end of the winding core portion 11 in a direction along the central axis C. The second flange portion 30 is connected to a second end of the winding core portion 11 in a direction along the central axis C. The first flange portion 20 and the second flange portion 30 are made of the same non-conductive material as the winding core portion 11. In addition, the first flange portion 20 and the second flange portion 30 are integrally molded with the winding core portion 11.

[0015] Here, a specific axis perpendicular to the central axis C is defined as the first axis X. In this embodiment, when viewed in a direction along the central axis C, the first axis X is parallel to two of the four sides of the winding core portion 11. An axis perpendicular to both the central axis C and the first axis X is defined as the second axis Y. Furthermore, in this 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 this embodiment, the direction from the winding core 11 toward the first flange 20 is defined as a third positive direction Z1, and the direction from the winding core 11 toward the second flange 30 is defined as a third negative direction Z2.

[0016] The first flange portion 20 protrudes outward relative to the winding core portion 11 in the direction along the first axis X and the direction along the second axis Y. The first flange portion 20 has a symmetrical shape in the direction along the second axis Y. The first flange portion 20 has an outer end surface 20A. The outer end surface 20A is a surface of the outer surface of the first flange portion 20 that faces the third positive direction Z1.

[0017] The first flange portion 20 has a main body portion 21 and a protrusion portion 22. The main body portion 21 is generally in the shape of a flattened rectangular prism in the direction along the third axis Z. When viewed in the third negative direction Z2, the edge of the main body portion 21 on the first negative direction X2 side is parallel to the second axis Y. When viewed in the third negative direction Z2, the edge of the main body portion 21 on the first positive direction X1 side is parallel to the second axis Y. Therefore, the main body portion 21 has an upper surface 21A facing the first positive direction X1 side.

[0018] The protrusion 22 protrudes from the upper surface 21A of the main body 21 in the first positive direction X1. The protrusion 22 has a quadrangular pyramid shape whose dimension along the second axis Y decreases toward the first positive direction X1. The protrusion 22 is located approximately in the center of the main body 21 in the direction along the second axis Y. The dimension of the protrusion 22 in the direction along the third axis Z is the same as the dimension of the main body 21 in the direction along the third axis Z.

[0019] The protrusion 22 has an upper end surface 22A and two side surfaces 22B. The upper end surface 22A is an outer surface of the protrusion 22 that faces the first positive direction X1. Each side surface 22B connects the upper end surface 22A to the upper surface 21A of the main body 21. One of the side surfaces 22B faces the second positive direction Y1. The other of the side surfaces 22B faces the second negative direction Y2. The main body 21 and the protrusion 22 are integrally molded. That is, inside the first flange 20, there is no clear boundary between the main body 21 and the protrusion 22.

[0020] The second flange 30 has a symmetrical shape with the first flange 20 in the direction along the third axis Z. That is, the second flange 30 protrudes outward from the winding core 11 in the direction along the first axis X and the direction along the second axis Y. The second flange 30 has an outer end surface 30A. The outer end surface 30A is a surface of the outer surface of the second flange 30 facing the third negative direction Z2. The second flange 30 has a main body 31 and a protruding portion 32. The configurations of the main body 31 and the protruding portion 32 are similar to those of the main body 21 and the protruding portion 22 of the first flange 20. That is, the main body 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.

[0021] In this embodiment, the maximum dimension of the drum core 10C along the first axis X is 1.4 mm, the maximum dimension of the drum core 10C along the second axis Y is 2.5 mm, and the maximum dimension of the drum core 10C along the third axis Z is 3.2 mm.

[0022] The top plate 12 is a rectangular plate. The top plate 12 is flat 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 20 facing the first negative direction X2 and the surface of the second flange 30 facing the first negative direction X2. In other words, the top plate 12 is bridged between the first flange 20 and the second flange 30. The material of the top plate 12 is the same non-conductive material as the drum core 10C.

[0023] The coil device 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 20. The first metal terminal 41 is located on the second positive direction Y1 side with respect to the center of the first flange 20 in the direction along the second axis Y. The second metal terminal 42 is attached to the first flange 20. The second metal terminal 42 is located on the second negative direction Y2 side with respect to the center of the first flange 20 in the direction along the second axis Y. The third metal terminal 43 is attached to the second flange 30. The third metal terminal 43 is located on the second positive direction Y1 side with respect to the center of the second flange 30 in the direction along the second axis Y. The fourth metal terminal 44 is attached to the second flange 30. The fourth metal terminal 44 is located on the second negative direction Y2 side with respect to the center of the second flange 30 in the direction along the second axis Y. The first metal terminal 41 to the fourth metal terminal 44 will be described in detail later.

[0024] As shown in Fig. 2, the coil device 10 includes a first wire 51 and a second wire 52. Although not shown in the figure, the first wire 51 includes 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.

[0025] A first connection end of the first wire 51 is joined to the first metal terminal 41 by thermocompression. 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. When viewed in the third negative direction Z2, the first wire 51 is wound around the winding core 11 so as to progress clockwise toward the third negative direction Z2. A second connection end of the first wire 51 opposite to the first connection end extends from the ridge of the winding core 11 on the first positive direction X1 side and the second negative direction Y2 side toward the third metal terminal 43. The second connection end of the first wire 51 is joined to the third metal terminal 43 by thermocompression.

[0026] Thermocompression bonding is a method in which a wire is clamped between a metal terminal and a heated jig, and the wire is melted and fixed to the metal terminal. As a result of this fixing method, the insulating coating of the wire is peeled off near the joint with the metal terminal, exposing the copper wire.

[0027] The second wire 52 has the same configuration as the first wire 51. That is, the second wire 52 has a copper wire and an insulating coating. The outer diameter L1 of the second wire 52 is about 50 μm. A first connection end of the second wire 52 is joined to the second metal terminal 42 by thermocompression. The second wire 52 extends from the second metal terminal 42 toward the ridgeline of the winding core 11 on the first positive direction X1 side and the second positive direction Y1 side. When viewed in the third negative direction Z2, the second wire 52 is wound around the winding core 11 so as to progress clockwise toward the third negative direction Z2. A second connection end of the second wire 52 opposite to the first connection end extends from the ridgeline of the winding core 11 on the first negative direction X2 side and the second negative direction Y2 side toward the fourth metal terminal 44. The second connection end of the second wire 52 is joined to the fourth metal terminal 44 by thermocompression.

[0028] <About the first metal terminal> 6, the first metal terminal 41 has an adhesive portion 410, a connecting portion 420, a mounting portion 430, an extension portion 440, and a joint portion 450. The adhesive portion 410, the connecting portion 420, the mounting portion 430, the extension portion 440, and the joint portion 450 are integrally molded. That is, there is no clear boundary between these members inside the first metal terminal 41.

[0029] In the following description, among the directions along the central axis C, the direction 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 when the first metal terminal 41 is used as the reference coincides with the third positive direction Z1.

[0030] <About the adhesive part> As shown in Fig. 1, the adhesive portion 410 is substantially plate-shaped. As shown in Fig. 7, the adhesive portion 410 is fixed to the outer end surface 20A of the first flange portion 20 via an adhesive 60. That is, the adhesive portion 410 is joined to the surface of the outer surface of the first flange portion 20 that faces the third positive direction Z1. In this way, the adhesive portion 410 is a 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.

[0031] As shown in Fig. 6, the adhesive portion 410 has a facing surface 411 and a recess 412. As shown in Fig. 7, the facing surface 411 is a surface that faces the outer end surface 20A from the third positive direction Z1 side, excluding the recess 412. In other words, the facing surface 411 of the first metal terminal 41 is a surface that faces the third negative direction Z2.

[0032] As shown in FIG. 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 including an end in the first negative direction X2. When viewed in the third positive direction Z1, the wide portion 410A has a substantially rectangular shape with two adjacent corners on the first negative direction X2 side chamfered. The dimension of the wide portion 410A in the direction along the second axis Y is substantially constant except for the chamfered portion. The wide portion 410A includes the portion of the opposing surface 411 and the recess 412 that has the largest dimension in the direction along the second axis Y.

[0033] The narrow portion 410B is adjacent to the wide portion 410A on the first positive direction X1 side. Specifically, the narrow portion 410B extends in the first positive direction X1 from the end of the wide portion 410A in the second negative direction Y2. In FIG. 6, the boundary between the narrow portion 410B and the wide portion 410A is virtually indicated by a dashed line. The narrow portion 410B has a smaller dimension along the second axis Y than the wide portion 410A. The dimension of the narrow portion 410B along the second axis Y is half or less of the dimension of the wide portion 410A along the second axis Y. The dimension of the narrow portion 410B along the second axis Y is approximately constant except for the connecting portion with the wide portion 410A.

[0034] 7, the recess 412 is recessed with respect to the facing surface 411. The recess 412 contains an adhesive 60. However, the adhesive 60 is not contained in a part of the recess 412 including the end 431 in the first positive direction X1.

[0035] As shown in Fig. 6, the recess 412 is located across the wide portion 410A and the narrow portion 410B. An 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 bonding portion 410 in the first negative direction X2. In other words, the recess 412 is not open toward the end of the bonding portion 410 in the first negative direction X2. In addition, as shown in Fig. 7, the end 431 of the recess 412 on the first negative direction X2 side is located on the first negative direction X2 side as viewed from the central axis C.

[0036] An end 432 of the recess 412 on the first positive direction X1 side is located on the first negative direction X2 side with respect to the first positive direction X1 end of the bonding portion 410. In other words, the end 432 of the recess 412 on the first positive direction X1 side 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 Fig. 7, the end 432 of the recess 412 on the first positive direction X1 side 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.

[0037] 6, the recess 412 in the narrow portion 410B spreads across the entire narrow portion 410B in the direction along the second axis Y. The recess 412 in the wide portion 410A spreads across the entire wide portion 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 portion 410A is greater than the maximum dimension of the recess 412 located in the narrow portion 410B.

[0038] An edge of the recess 412 on the first negative direction X2 side is approximately parallel to the second axis Y. In addition, an 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 on the wide portion 410A is larger than the area of ​​the portion of the recess 412 located on the narrow portion 410B.

[0039] The dimension of the recess 412 in the direction along the third axis Z, i.e., the depth of the recess 412, is approximately constant except for the edge of the recess 412. Therefore, reflecting the difference in area described above, the volume V1 of the portion of the recess 412 located in the wide portion 410A is larger than the volume V2 of the portion of the recess 412 located in the narrow portion 410B.

[0040] As shown in FIG. 7, the combined area of ​​the opposing surface 411 and the recess 412, that is, the area facing the outer end surface 20A of the first flange 20 of the first metal terminal 41, is defined as the opposing area P. In this case, as shown in FIG. 6, when viewed in a direction along the central axis C, the area of ​​the recess 412 facing the outer end surface 20A of the first flange 20 is half or more of the opposing area P. In other words, the area of ​​the recess 412 facing the outer end surface 20A of the first flange 20 is equal to or more than the area of ​​the opposing surface 411. Also, as shown in FIG. 7, the maximum dimension L3 of the recess 412 in the direction along the first axis X is half or more of the maximum dimension L4 of the opposing area P in the direction along the first axis X. Note that "when viewed in a direction along the central axis C" is not limited to a direct view, but also includes a see-through view as described above.

[0041] <About the connection part> As shown in FIG. 7, the connecting portion 420 is connected to the end of the adhesive portion 410 in the first positive direction X1. In FIG. 6, the boundary between the connecting portion 420 and the adhesive portion 410 is virtually indicated by a dashed line. The connecting portion 420 extends from the adhesive portion 410 in 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 with respect to the upper end surface 22A of the first flange portion 20. The connecting portion 420 is bent by about 90 degrees midway. The end of the connecting portion 420 opposite to the adhesive portion 410 faces the third negative direction Z2.

[0042] <About the mounting part> As shown in FIG. 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 a portion of the first metal terminal 41 located closest to the first positive direction X1. The mounting portion 430 is spaced apart from the upper end surface 22A of the first flange portion 20 in the first positive direction X1. That is, there is a gap between the mounting portion 430 and the upper end surface 22A. The mounting portion 430 is spaced apart from any outer surface of the drum core 10C, including the upper end surface 22A. The mounting portion 430 is a portion that faces the substrate when the coil component 10 is mounted on the substrate.

[0043] 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 plate thickness of the first metal terminal 41. This plate thickness is approximately constant. The plate thickness of the first metal terminal 41 is approximately constant in the adhesive portion 410, the connecting portion 420, the mounting portion 430, and the extension portion 440 excluding the recess 412.

[0044] <About the extension section> As shown in FIG. 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 from the mounting portion 430 toward the second positive direction Y1 side and the first negative direction X2 side at an approximately oblique angle. 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 FIG. 5, when viewed in the direction along the third axis Z, the extension portion 440 extends so as to approach the side surface 22B of the protruding portion 22 facing the second positive direction Y1 side 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 protruding portion 22. Note that if the extension portion 440 does not have a surface parallel to the side surface 22B, the extension portion 440 is in line contact with the side surface 22B.

[0045] Specifically, as shown in Fig. 5, when viewed in the third positive direction Z1, the angle between the side surface 22B and the upper surface 21A is the angle on the second positive direction Y1 side and the first positive direction X1 side, which is defined as a first angle θ1. The extension portion 440 has a linearly extending portion. The angle between the virtual line VL0 passing through the center of the linearly extending portion and the upper surface 21A is the angle on the second positive direction Y1 side and the first positive direction X1 side, which is defined as a second angle θ2. In this case, the second angle θ2 is smaller than the first angle θ1.

[0046] <About joints> As shown in Fig. 4, the joint 450 is connected to an end of the extension 440 on the first negative direction X2 side. The joint 450 is generally plate-shaped. When viewed in a direction along the first axis X, the joint 450 is generally rectangular and elongated in the direction of the third axis Z. As shown in Fig. 3, the maximum dimension W4 of the joint 450 in the direction along the third axis Z is larger 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.

[0047] 4, the bonding portion 450 faces the upper surface 21A of the first flange portion 20 from the first positive direction X1 side. The surface of the bonding portion 450 facing the first negative direction X2 is in contact with the upper surface 21A. On the other hand, the surface of the bonding portion 450 facing the first negative direction X2 is not fixed to the upper surface 21A. In other words, the adhesive 60 or the like is not interposed between the surface of the bonding portion 450 facing the first negative direction X2 and the upper surface 21A.

[0048] When viewed in a direction along the first axis X, the joint 450 does not protrude from the upper surface 21A of the first flange 20 in the third negative direction Z2. That is, the end of the upper surface 21A of the first flange 20 on the third negative direction Z2 side is located on the third negative direction Z2 side with respect to the end of the joint 450 on the third negative direction Z2 side.

[0049] 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 surface of the outer surface of the joint 450 that is located closest to the third positive direction Z1. When viewed in a direction along the first axis X, the horizontal surface 451 has a substantially rectangular shape.

[0050] The inclined surface 452 further has a first inclined surface 452A and a second inclined surface 452B. The first inclined surface 452A is a flat surface facing the first positive direction X1 side and the third negative direction Z2 side. The first inclined surface 452A is adjacent to the horizontal surface 451 on the third negative direction Z2 side. The first inclined surface 452A is located in the first negative direction X2 as it moves toward the third negative direction Z2.

[0051] The second inclined surface 452B is a flat surface facing the first positive direction X1 side and the third negative direction Z2 side. 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 positioned in the first negative direction X2 as it approaches the third negative direction Z2. The second inclined surface 452B reaches the end of the joint 450 on the third negative direction Z2 side.

[0052] As shown in FIG. 3, when viewed in a direction along the second axis Y, a virtual straight line VL1 is drawn that passes through an end E1 of the first inclined surface 452A on the third positive direction Z1 side and is parallel to the central axis C. The acute angle formed by the first inclined surface 452A and the virtual straight line VL1 is defined as an angle P1. Also, when viewed in a direction along the second axis Y, a virtual straight line VL2 is drawn that passes through an end E2 of the second inclined surface 452B on the third negative direction Z2 side and is parallel to the central axis C. The acute angle formed by the second inclined surface 452B and the virtual straight line VL2 is defined as an angle P2. In this case, the angle P2 is larger than the angle P1.

[0053] The first inclined surface 452A and the second inclined surface 452B are both flat surfaces. Therefore, a tangent to an end E1 of the first inclined surface 452A on the third positive direction Z1 side is a line extending on the first inclined surface 452A. Similarly, a tangent to an end E2 of the second inclined surface 452B on the third negative direction Z2 side is a line extending on the second inclined surface 452B.

[0054] Further, 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 is approximately 70 μm. In other words, 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 is greater than the outer diameter L1 of the first wire 51.

[0055] <Regarding the second metal terminal 42 to the fourth metal terminal 44> As shown in FIG. 1, the second metal terminal 42 has a shape inverted relative to 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.

[0056] <About the joining of the first wire and the joint> When the first wire 51 is joined to the joint 450, the first connection end of the first wire 51 is placed on the horizontal surface 451, and a jig is pressed against the horizontal surface 451 in parallel. The jig is a heater tip. The jig comes into contact with the first wire 51 on the horizontal surface 451 and with a portion of the first wire 51 on the third positive direction Z1 side on the first inclined surface 452A. When the jig comes into contact with the first wire 51, the insulating coating of the first wire 51 melts. That is, the insulating coating of all the first wires 51 on the horizontal surface 451 and with a portion of the first wires 51 on the first inclined surface 452A is peeled off, exposing the copper wire. In addition, during thermocompression bonding, the first wire 51 on the horizontal surface 451 is crushed and flattened by the load of the jig. Similarly, a portion of the first wire 51 on the third positive direction Z1 side on the first inclined surface 452A with which the jig comes into contact is flattened. During the thermocompression bonding, the insulating coating remains on a portion of the first wire 51 on the first inclined surface 452A that does not come into contact with the jig and on the first wire 51 on the second inclined surface 452B. Also, the first wire 51 on the second inclined surface 452B is not flattened because it does not come into contact with the jig.

[0057] <Operation of this embodiment> When attaching the first metal terminal 41 to the first flange portion 20, first, the first metal terminal 41 is arranged so that the facing surface 411 contacts the outer end surface 20A. At this time, the first metal terminal 41 is arranged so that the adhesive 60 is accommodated in the recess 412. Then, the first metal terminal 41 is arranged so that the joint portion 450 contacts the upper surface 21A. Furthermore, the first metal terminal 41 is arranged so that the extension portion 440 contacts the side surface 22B. When the first metal terminal 41 is arranged in this manner, the mounting portion 430 is separated from the drum core 10C in the first positive direction X1 side. That is, the mounting portion 430 is elastically deformable. It is assumed that the adhesive 60 accommodated in the recess 412 reaches the mounting portion 430 by the capillary phenomenon through the connecting portion 420. In this case, the adhesive 60 is located between the mounting portion 430 and the upper end surface 22A. The mounting portion 430 is elastically deformable as long as the space between the mounting portion 430 and the upper end surface 22A is not entirely filled with the adhesive 60. That is, the mounting portion 430 is elastically deformable even when a synthetic resin such as the adhesive 60 is partially attached between the mounting portion 430 and the drum core 10C. That is, "the mounting portion 430 is separated from the drum core 10C in the first positive direction X1" also includes the case where a synthetic resin is partially accommodated between the mounting portion 430 and the drum core 10C.

[0058] <Effects of this embodiment> The effects of this embodiment will be described below. Note that, although the effects relating to first metal terminal 41 will be representatively described below, the same effects are achieved for each metal terminal.

[0059] (1) When the coil component 10 is mounted on a substrate or the like with the first positive direction X1 facing the substrate or the like, the mounting portion 430 of the first metal terminal 41 is joined to the substrate or the like. According to the above embodiment, the mounting portion 430 is separated from the outer surface of the drum core 10C. Therefore, even if a difference in the degree of thermal deformation occurs between the coil component 10 and the substrate or the like in a state in which the coil component 10 is mounted on the substrate or the like, the difference can be absorbed by the elastic deformation of the mounting portion 430. As a result, the force caused by the difference in thermal deformation acting between the mounting portion 430 of the first metal terminal 41 and the substrate or the like can be suppressed, and therefore the mounting strength of the coil component 10 to the substrate or the like can be prevented from decreasing.

[0060] (2) According to the above embodiment, the extension portion 440 contacts the side surface 22B of the first flange portion 20. According to the above configuration, when attaching the first metal terminal 41 to the first flange portion 20, the extension portion 440 is brought into contact with the side surface 22B of the protrusion 22, so that the first metal terminal 41 can be positioned relative to the first flange portion 20 in the direction along the second axis Y. Therefore, even if the mounting portion 430 is separated from the drum core 10C, the accuracy of the attachment position of the first metal terminal 41 in the direction along the second axis Y can be improved.

[0061] (3) According to the above embodiment, 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 smallest dimension W2 of the mounting portion 430 in the direction along the first axis X. According to this configuration, the curved portion of the connection portion between the mounting portion 430 and the coupling portion 420 is located in the first positive direction X1 with respect to the upper end surface 22A. Therefore, it is possible to prevent the adhesive 60 interposed between the adhesive portion 410 and the first flange portion 20 from adhering to the mounting portion 430 due to capillary action.

[0062] (4) Suppose that extension portion 440 is in surface contact with side surface 22B. In this case, if a manufacturing error occurs in the shape of extension portion 440 or the shape of protrusion 22, extension portion 440 may not be able to make surface contact with side surface 22B, and first metal terminal 41 may not be able to be positioned. In this regard, in the above embodiment, extension portion 440 is in line contact with side surface 22B. With this configuration, even if some manufacturing error occurs in the shape of extension portion 440 and the shape of protrusion 22, extension portion 440 can be brought into contact with side surface 22B as expected.

[0063] (5) In the above embodiment, the bonding portion 410 has a facing surface 411 of the outer surface of the first flange portion 20 bonded to the outer end surface 20A of the first flange portion 20. With this configuration, the first metal terminal 41 can be positioned with respect to the first flange portion 20 not only in the direction along the second axis Y but also in the direction along the central axis C.

[0064] (6) In the above embodiment, the first metal terminal 41 has a joint 450 that faces the upper surface 21A of the first flange 20 from the first positive direction X1 side. In addition, the joint 450 is in contact with the upper surface 21A. With this configuration, the first metal terminal 41 can be positioned with respect to the first flange 20 not only in the direction along the second axis Y but also in the direction along the first axis X.

[0065] <Example of change> This embodiment can be modified as follows. This embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs. As for the modifications common to the first metal terminal 41 to the fourth metal terminal 44, only the first metal terminal 41 will be described as a representative.

[0066] In the above embodiment, the configuration of the coil component 10 is not limited. For example, the coil component 10 may be provided without the top plate 12. In addition, the shape of the first flange portion 20 is not limited to the shape of the above embodiment. For example, the first flange portion 20 may be provided without the protruding portion 22.

[0067] In the above embodiment, the coil device 10 may omit the second wire 52. For example, if the coil device 10 includes only the first wire 51, it is sufficient that one metal terminal is attached to each flange portion.

[0068] In the above embodiment, the winding core 11 does not have to be in the shape of a rectangular prism. For example, the cross-sectional shape of the winding core 11 may be a circle, an ellipse, 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 in the above embodiment. The first metal terminal 41 may have the adhesive portion 410, the mounting portion 430, and the connecting portion 420.

[0069] In the above embodiment, the bonding portion 450 may be separated from the upper surface 21A. Also, the adhesive 60 may be accommodated between the bonding portion 450 and the upper surface 21A. In the above embodiment, there may not be a clear boundary between the first inclined surface 452A and the second inclined surface 452B of the joint 450. In other words, the inclination angle of the inclined surface 452 may change gradually.

[0070] 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 further have a second horizontal surface in addition to the horizontal surface 451.

[0071] In the above embodiment, the horizontal surface 451 of the joint 450 can be omitted. That is, the joint 450 may be composed of only the inclined surface 452. In this case, it is preferable that the first wire 51 is joined to the inclined surface 452 at a portion of the inclined surface 452 closer to the outside. The joint 450 may have a further inclined surface in addition to the first inclined surface 452A and the second inclined surface 452B.

[0072] 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 be composed of only one inclined surface. In addition, the inclined surface may not be flat but may be curved. In the above embodiment, the joint 450 may not have the inclined surface 452 and may be composed of only the horizontal surface 451.

[0073] 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 with respect to the end of the joint 450 on the third negative direction Z2 side. In other words, the joint 450 may protrude from the first flange 20.

[0074] In the above embodiment, the distance L2 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 smaller than or equal to the outer diameter L1 of the first wire 51.

[0075] In the above embodiment, the maximum dimension W3 of the extension portion 440 in the direction along the third axis Z may be greater than or equal to the maximum dimension W4 of the joint portion 450 in the direction along the third axis Z.

[0076] In the above embodiment, the joining portion of the first metal terminal 41 with the first flange portion 20 is not limited to the example in the above embodiment. That is, the adhesive portion 410 may be joined to an inner surface of the outer surface of the first flange portion 20, a surface facing inward, or a surface facing in the direction along the second axis Y.

[0077] In the above embodiment, the coil device 10 can omit the recess 412. In this case, the first metal terminal 41 is attached to the first flange portion 20 at some location via the adhesive 60.

[0078] In the above embodiment, when viewed in the direction along the third axis Z, the area of ​​the region of the recess 412 facing the outer end surface 20A may be smaller than the area of ​​the facing surface 411 or may be the same as it.

[0079] In the above embodiment, the position of the dent 412 is not limited to the example of the above embodiment. That is, the end 432 of the dent 412 on the first positive direction X1 side may be located on the first positive direction X1 side with respect to the end of the adhesive portion 410 in the first positive direction X1. Also, the end 431 of the dent 412 on the first negative direction X2 side may be located on the first positive direction X1 side as viewed from the central axis C.

[0080] In the above embodiment, the adhesive portion 410 may have a constant dimension in the direction along the second axis Y. In other words, the adhesive portion 410 does not have to be largely divided into the wide portion 410A and the narrow portion 410B.

[0081] In the above embodiment, the recess 412 does not have to extend over the entire wide portion 410A in the direction along the second axis Y. Similarly, the recess 412 does not have to extend over the entire 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 smaller than half the maximum dimension L4 of the facing region P. In the above embodiment, the adhesive 60 may be contained up to the end 432 of the recess 412 in the first positive direction X1. Also, the adhesive 60 may reach the facing surface 411 and the connecting portion 420.

[0083] In the above embodiment, the adhesive 60 may be contained in a portion between the mounting portion 430 and the protruding portion 22 . In the above embodiment, the shortest distance W1 from the mounting portion 430 to the upper end surface 22A may be smaller than the smallest dimension W2 of the mounting portion 430 in the direction along the first axis X, or may be the same as the smallest dimension W2.

[0084] In the above embodiment, the extension portion 440 may be in point contact with the side surface 22B. If either the surface of the outer surface of the extension portion 440 facing the side surface 22B or the side surface 22B is curved and has a different curvature, the two may be in point contact. Also, in the above embodiment, the extension portion 440 may be in line contact with the side surface 22B at several points.

[0085] In the above embodiment, the extension portion 440 does not have to be in contact with the side surface 22 B. Furthermore, the extension portion 440 may extend so as to move away from the side surface 22 B in the first negative direction X2.

[0086] In the above embodiment, the shape of the extension portion 440 is not limited to the example of the embodiment. For example, in the example shown in FIG. 8, when viewed in the third negative direction Z2, the extension portion 440 has a portion that extends in a direction toward the center of the protrusion 22 in the direction along the second axis Y as it approaches the first negative direction X2. Specifically, the extension portion 440 of the first metal terminal 41 has a portion that extends toward the second negative direction Y2 as it approaches the first negative direction X2. That is, the extension portion 440 is curved in a Z shape. With this shape, the extension portion 440 is likely to be in line contact with the side surface 22B of the first flange portion 20. Also, in the example shown in FIG. 8, the end of the joint portion 450 on the third positive direction Z1 side is separated from the upper surface 21A. On the other hand, the end of the joint portion 450 on the third negative direction Z2 side is in contact with the upper surface 21A. The joint portion 450 is in line contact with the upper surface 21A. As in this example, if the joint 450 is configured so that even a portion of it contacts the upper surface 21A, the first metal terminal 41 can be positioned with respect to the first flange portion 20 in the direction along the first axis X. Note that, as in this example, when the joint 450 is configured to be inclined with respect to the third axis Z, a plane parallel to the face of the joint 450 on the first negative direction X2 side is defined as the horizontal plane 451.

[0087] The technical ideas that can be derived from the above-described embodiments and modifications will be described below. [1] A coil component comprising: a columnar winding core portion, a first flange portion connected to a first end in a direction along a central axis of the winding core portion, and a second flange portion connected to a second end of the winding core portion opposite the first end; a first metal terminal attached to the first flange portion; and a wire wound around the winding core portion and having a first connection end joined to the first metal terminal, wherein an axis perpendicular to the central axis is a first axis, and one of the directions along the first axis is a first positive direction, and the first flange portion protrudes outward from the winding core portion in the first positive direction, and the first metal terminal has an adhesive portion joined to the first flange portion via an adhesive, a mounting portion of the first metal terminal located furthest on the first positive direction side, and a connecting portion connecting the adhesive portion and the mounting portion, and the mounting portion is away from the drum core in the first positive direction.

[0088] [2] The coil component described in [1], wherein the first flange portion has an upper surface facing the first positive direction and a protrusion protruding from the upper surface toward the first positive direction, and when a direction opposite to the first positive direction is defined as a first negative direction and an axis perpendicular to both the central axis and the first axis is defined as a second axis, the protrusion portion has an upper end surface facing the mounting portion from the first negative direction side and a side surface connecting the upper end surface and the upper surface and intersecting the second axis, and the first metal terminal has an extension portion extending from the mounting portion and in contact with the side surface.

[0089] [3] The coil component described in [1] or [2], wherein the first flange portion has an upper surface facing the first positive direction and a protrusion portion protruding from the upper surface toward the first positive direction, and when the direction opposite the first positive direction is defined as a first negative direction, the protrusion portion has an upper end surface facing the mounting portion from the first negative direction side, and a shortest distance from the mounting portion to the upper end surface in the direction along the first axis is greater than a smallest dimension of the mounting portion in the direction along the first axis.

[0090] [4] The coil component described in [2] or [3], wherein the first flange portion has an upper surface facing the first positive direction and a protrusion protruding from the upper surface toward the first positive direction, and when a direction opposite to the first positive direction is defined as a first negative direction and an axis perpendicular to both the central axis and the first axis is defined as a second axis, the protrusion portion has an upper end surface facing the mounting portion from the first negative direction side and a side surface connecting the upper end surface and the upper surface and intersecting the second axis, and the first metal terminal has an extension portion extending from the mounting portion and in contact with the side surface, and the extension portion is in line contact or point contact with the side surface.

[0091] [5] The coil component according to any one of [2] to [4], wherein when a direction opposite to the first positive direction is defined as a first negative direction and an axis perpendicular to both the central axis and the first axis is defined as a second axis, the first flange portion has an upper surface facing the first positive direction and a protruding portion protruding from the upper surface to the first positive direction, the protruding portion has an upper end surface facing the mounting portion from the first negative direction side and a side surface connecting the upper end surface and the upper surface and intersecting the second axis, the first metal terminal has an extension portion extending from the mounting portion and in contact with the side surface, and when viewed in a direction along the central axis, the extension portion has a portion that extends in a direction along the second axis toward a center of the protruding portion as it approaches the first negative direction.

[0092] [6] A coil component according to any one of [1] to [5], wherein when a direction along the central axis from the first metal terminal toward the winding core portion is defined as an inward direction, and a direction opposite to the inward direction is defined as an outward direction, the adhesive portion is joined to a surface of an outer surface of the first flange portion facing the inward direction or a surface facing the outward direction.

[0093] [7] The coil component described in any one of [2] to [6], wherein the first flange portion has an upper surface facing the first positive direction and a protrusion protruding from the upper surface to the first positive direction, wherein when a direction opposite to the first positive direction is defined as a first negative direction and an axis perpendicular to both the central axis and the first axis is defined as a second axis, the protrusion portion has an upper end surface facing the mounting portion from the first negative direction side and a side surface connecting the upper end surface and the upper surface and intersecting the second axis, the first metal terminal has an extension portion extending from the mounting portion and in contact with the side surface, and the first metal terminal has a joint portion extending from the extension portion, facing the upper surface from the first positive direction side and in contact with the upper surface. [Explanation of symbols]

[0094] C…Central axis X…1st axis X1…first positive direction 10...Coil parts 10C…Drum core 11...Core 20…First flange 21...Main body 30…Second flange 41...First metal terminal 51…First wire 60…Adhesive 410...Adhesive part 420...Connection part 430…Mounting section

Claims

1. 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 a central axis thereof, and a second flange portion connected to a second end of the winding core portion on the opposite side to the first end; a first metal terminal attached to the first flange; a wire wound around the winding core and having a first connection end joined to the first metal terminal; Equipped with When an axis perpendicular to the central axis is defined as a first axis, one of the directions along the first axis is defined as a first positive direction, a direction opposite to the first positive direction is defined as a first negative direction, and an axis perpendicular to both the central axis and the first axis is defined as a second axis, The first flange portion protrudes outward relative to the winding core portion in the first positive direction, The first metal terminal is an adhesive portion bonded to the first flange portion via an adhesive; a mounting portion of the first metal terminal located closest to a first positive direction side; a connecting portion connecting the adhesive portion and the mounting portion; It has The mounting portion is spaced from the drum core toward the first positive direction, the first flange portion has an upper surface facing the first positive direction side and a protruding portion protruding from the upper surface toward the first positive direction side, the protrusion has an upper end surface facing the mounting portion from the first negative direction side, and a side surface connecting the upper end surface and the upper surface and intersecting the second axis, the first metal terminal has an extension portion extending from the mounting portion and in contact with the side surface, When viewed in a direction along the central axis, the extension portion has a portion that extends in a direction toward a center of the protrusion portion in the direction along the second axis as it approaches the first negative direction. Coil parts.

2. The shortest distance from the mounting portion to the upper end surface in a direction along the first axis is greater than the smallest dimension of the mounting portion in a direction along the first axis. The coil component according to claim 1 .

3. The extension portion is in line contact or point contact with the side surface. The coil component according to claim 1 .

4. When a direction from the first metal terminal toward the winding core portion among the directions along the central axis is defined as an inner direction, and a direction opposite to the inner direction is defined as an outer direction, The adhesive portion is bonded to a surface of the first flange portion that faces inward or a surface of the first flange portion that faces outward. The coil component according to claim 1 .

5. The first metal terminal extends from the extension portion, faces the upper surface from the first positive direction side, and has a joint portion in contact with the upper surface. The coil component according to claim 1 .

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