Coil component

Abstract

To suppress deformation of a mounting part.SOLUTION: A coil component 10 comprises a drum core with a winding core part, a first flange part 20, and a second flange part. The coil component 10 also comprises a first metal terminal 41. The first metal terminal 41 has a junction part 450, a mounting part 430, and a stretched part 440. A first wire end of a first wire 51 is connected with a surface facing a first positive direction X1 side of the junction part 450. The mounting part 430 is located on the most first positive direction X1 side of the first metal terminal 41. The stretched part 440 connects between the mounting part 430 and the junction part 450. The stretched part 440 has a second portion 442 whose thickness dimension is smaller than that of the mounting part 430.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a coil component.

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. These bobbin portion and flange portions constitute the core of the coil component.

[0003] The above-described coil component includes a plurality of metal terminals and two wires. Each metal terminal has a mounting portion, a joining portion, and an extending portion. When the direction orthogonal to the central axis of the bobbin portion is defined as the first positive direction, the mounting portion is located on the most first positive direction side among the metal terminals. This mounting portion is the portion that contacts the substrate when mounting the coil component on the substrate or the like. The joining portion is the portion to which the end of the wire is joined. The extending portion is the portion that connects the mounting portion and the joining portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a coil component such as that of Patent Document 1, when joining the end of the wire to the joining portion, an external force may act on the joining portion. And there is a possibility that the external force applied to the joining portion acts on the mounting portion via the extending portion. At this time, there is a possibility that the mounting portion is deformed due to the influence of the external force.

Means for Solving the Problems

[0006] To solve the above problems, the present invention provides a drum core having a columnar winding core portion, a first flange portion connected to a first end in a direction parallel to the central axis of the winding core portion, and a second flange portion connected to a second end opposite to the first end in the winding core portion, a plate-shaped first metal terminal attached to the first flange portion, and a wire wound around the winding core portion with a first wire end joined to the first metal terminal. When a specific axis perpendicular to the central axis is defined as the first axis and one of the directions parallel to the first axis is defined as the first positive direction, the first flange portion protrudes outward with respect to the winding core portion in the first positive direction, and the first metal terminal has a joint portion to which the first wire end of the wire is connected, a mounting portion located on the most first positive direction side of the first metal terminal, and an extension portion connecting the mounting portion and the joint portion. The first wire end is joined to a surface facing the first positive direction side in the joint portion, and the extension portion is a coil component having a thin-walled portion with a thickness dimension smaller than the thickness dimension of the mounting portion.

[0007] According to the above configuration, the thin-walled portion is more easily deformed than the mounting portion. Suppose an external force acts on the joint portion when joining the end of the wire to the joint portion. At this time, the deformation of the thin-walled portion makes it difficult for the influence of the external force to be transmitted to the mounting portion. As a result, the deformation of the mounting portion can be suppressed.

Effect of the Invention

[0008] Suppress the influence of the external force acting on the mounting portion via the extension portion.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

[0010] Hereinafter, an embodiment of the coil component will be described. Note that the drawings may show components enlarged for easy understanding. The dimensional ratios of the components may be different from the actual ones or those in another drawing.

[0011] <Overall Configuration> As shown in FIG. 1, the coil component 10 includes a drum core 10C and a top plate 12.

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

[0013] The first flange portion 20 is connected to the first end in the direction parallel to the central axis C of the bobbin portion 11. The second flange portion 30 is connected to the second end opposite to the first end in the direction parallel to the central axis C of the bobbin portion 11. The materials of the first flange portion 20 and the second flange portion 30 are the same non-conductive material as that of the bobbin portion 11. Also, the first flange portion 20 and the second flange portion 30 are integrally formed with the bobbin 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 parallel to 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 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 parallel to 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 parallel to 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 parallel to 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 parallel to the first axis X and the direction parallel to the second axis Y. The first flange portion 20 has a symmetric shape in the direction along the second axis Y.

[0016] The first flange portion 20 includes a main body portion 21, a bottom surface side protruding portion 22, and an end surface side protruding portion 23. The main body portion 21 has a substantially quadrangular prism shape that is flat in the direction parallel to the third axis Z. Here, among the directions parallel to the central axis C, the direction from the first flange portion 20 toward the core portion 11 is defined as the inner direction, and the direction from the core portion 11 toward the first flange portion 20 is defined as the outer direction. As shown in FIG. 2, the surface of the outer surface of the main body portion 21 that faces the outer direction is defined as the outer end surface 21A, and the surface of the outer surface of the main body portion 21 that faces the inner direction is defined as the inner end surface 21B. Also, as shown in FIG. 1, the surface of the outer surface of the main body portion 21 that faces the first positive direction X1 is defined as the bottom surface 21C, and the surface of the outer surface of the main body portion 21 that faces the first negative direction X2 is defined as the top surface 21D. Further, as shown in FIG. 2, the surface of the outer surface of the main body portion 21 that faces the second positive direction Y1 is defined as the first side surface 21E, and the surface located in the second negative direction Y2 of the main body portion 21 is defined as the second side surface 21F. Also, as shown in FIG. 1, the core portion 11 is connected to the inner end surface 21B. That is, the outer end surface 21A is the surface of the main body portion 21 that is opposite to the surface connected to the core portion 11.

[0017] The bottom surface side protrusion 22 protrudes from the bottom surface 21C of the main body portion 21 toward the first positive direction X1. The bottom surface side protrusion 22 is located at the center of the main body portion 21 in a direction parallel to the second axis Y. The bottom surface side protrusion 22 and the main body portion 21 are integrally molded. That is, there is no distinct boundary between the bottom surface side protrusion 22 and the main body portion 21. Details of the shape of the bottom surface side protrusion 22 will be described later.

[0018] As shown in FIG. 2, the end surface side protrusion 23 protrudes outward from the outer end surface 21A of the main body portion 21. The end surface side protrusion 23 is located at the center of the main body portion 21 in a direction parallel to the second axis Y. Further, the end surface side protrusion 23 extends over the entire main body portion 21 in a direction parallel to the first axis X. Also, the end surface side protrusion 23 protrudes from the bottom surface side protrusion 22. That is, the end surface side protrusion 23 extends over a part on the first negative direction X2 side of the bottom surface side protrusion 22 in a direction parallel to the first axis X. The end surface side protrusion 23, the main body portion 21, and the bottom surface side protrusion 22 are integrally molded. That is, there is no distinct boundary between the end surface side protrusion 23 and the main body portion 21, and between the end surface side protrusion 23 and the bottom surface side protrusion 22. Details of the shape of the end surface side protrusion 23 will be described later.

[0019] The second flange portion 30 has a symmetrical shape with the first flange portion 20 in a direction parallel to the third axis Z. That is, the second flange portion 30 protrudes outward with respect to the winding core portion 11 in a direction parallel to the first axis X and a direction parallel to the second axis Y. And the second flange portion 30 has a main body portion 31, a bottom surface side protrusion 32, and an end surface side protrusion 33.

[0020] Here, among the directions parallel to the central axis C, the direction from the second flange portion 30 toward the winding core portion 11 is defined as the inner direction, and the direction from the winding core portion 11 toward the second flange portion 30 is defined as the outer direction. That is, when the second flange portion 30 is used as a reference, the inner direction and the outer direction are opposite to those when the first flange portion 20 is used as a reference.

[0021] As shown in FIG. 2, the surface facing the outer direction of the main body 31 is defined as the outer end surface 31A, and the surface facing the inner direction of the main body 31 is defined as the inner end surface 31B. Further, as shown in FIG. 1, the surface facing the first positive direction X1 side of the main body 31 is defined as the bottom surface 31C, and the surface facing the first negative direction X2 side of the main body 31 is defined as the top surface 31D. Also, as shown in FIG. 2, the surface facing the second positive direction Y1 of the main body 31 is defined as the first side surface 31E, and the surface facing the second negative direction Y2 of the main body 31 is defined as the second side surface 31F.

[0022] The bottom surface side protrusion 32 protrudes from the bottom surface 31C of the main body 31 toward the first positive direction X1 side. The shape and arrangement of the bottom surface side protrusion 32 in the second flange portion 30 are the same as the shape and arrangement of the bottom surface side protrusion 22 in the first flange portion 20.

[0023] The end surface side protrusion 33 protrudes from the outer end surface 31A of the main body 31 toward the outer direction side. The shape and arrangement of the end surface side protrusion 33 in the second flange portion 30 are the same as the shape and arrangement of the end surface side protrusion 23 in the first flange portion 20.

[0024] In the present embodiment, the maximum dimension in the direction parallel to the first axis X of the drum core 10C is 2.3 mm. Also, the maximum dimension in the direction parallel to the second axis Y of the drum core 10C is 2.6 mm. Further, the maximum dimension in the direction parallel to the third axis Z of the drum core 10C is 3.5 mm.

[0025] As shown in FIG. 1, the top plate 12 is in the shape of a rectangular plate. The top plate 12 is flat in the direction parallel to 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 top surface 21D of the main body 21 of the first flange portion 20 and the top surface 31D of the main body 31 of the second flange portion 30. That is, the top plate 12 is bridged 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.

[0026] 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 end face side protruding portion 23. 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 end face side protruding portion 23. 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 end face side protruding portion 33. 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 end face side protruding portion 33. Details of the shapes of these first metal terminal 41 to fourth metal terminal 44 will be described later.

[0027] As shown in FIG. 2, the coil component 10 includes a first wire 51 and a second wire 52. Although illustration is omitted, 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 orthogonal to the direction in which the first wire 51 extends.

[0028] The first wire end of the first wire 51 is joined to the first metal terminal 41 by thermocompression bonding. The first wire 51 extends from the first metal terminal 41 toward the ridge line on the first negative direction X2 side and the second positive direction Y1 side of the core portion 11. Then, when viewed in the direction of the third negative direction Z2, the first wire 51 is wound around the core portion 11 so as to proceed clockwise as it goes in the third negative direction Z2. Then, in the vicinity of the second flange portion 30, the first wire 51 extends from the ridge line on the first positive direction X1 side and the second negative direction Y2 side of the core portion 11 toward the third metal terminal 43. The second wire end of the first wire 51 is joined to the third metal terminal 43 by thermocompression bonding.

[0029] 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 first wire end of the second wire 52 is joined to the second metal terminal 42 by thermocompression bonding. The second wire 52 extends from the second metal terminal 42 toward the ridge line on the first positive direction X1 side and the second positive direction Y1 side of the winding core part 11. Then, when viewed in the direction of the third negative direction Z2, the second wire 52 is wound around the winding core part 11 so as to progress clockwise as it goes in the third negative direction Z2. Then, the second wire 52 extends from the ridge line on the first negative direction X2 side and the second negative direction Y2 side of the winding core part 11 toward the fourth metal terminal 44 in the vicinity of the second flange part 30. The second wire end of the second wire 52 is joined to the fourth metal terminal 44 by thermocompression bonding.

[0030] <Regarding the bottom surface side protrusion> Hereinafter, the bottom surface side protrusion 22 in the first flange part 20 will be described as a representative. Note that the bottom surface side protrusion 32 on the second flange part 30 side has a symmetrical shape in a direction parallel to the bottom surface side protrusion 22 in the first flange part 20 with respect to the third axis Z. Further, the bottom surface side protrusion 22 is a second protrusion that protrudes in the first positive direction X1 from the bottom surface 21C which is the surface facing the first positive direction X1 side of the first flange part 20.

[0031] As described above, the bottom surface side protrusion 22 protrudes in the first positive direction X1 from the bottom surface 21C of the main body part 21. The bottom surface side protrusion 22 is located substantially at the center in the direction parallel to the second axis Y of the main body part 21.

[0032] As shown in FIG. 1, the bottom surface side protrusion 22 is generally quadrangular prism-shaped. Among the edges on the protruding tip side of the bottom surface side protrusion 22, the edges on the second positive direction Y1 side, the second negative direction Y2 side, and the third positive direction Z1 side are chamfered into a C shape. As a result, the bottom surface side protrusion 22 has a shape in which a substantially frustum-shaped tip part protrudes from the base end part of the quadrangular prism.

[0033] As shown in FIGS. 2 and 3, the bottom surface side protrusion 22 has an inner end surface 22A, an opposing surface 22B, a first inclined surface 22C, and an outer end surface 22D. Further, the bottom surface side protrusion 22 has two second inclined surfaces 22E, a first flat surface 22F, two second flat surfaces 22G, a chamfered surface 22H, and two side end surfaces 22I.

[0034] As shown in FIG. 3, the inner end face 22A is the face of the bottom surface side protruding portion 22 facing the third negative direction Z2 side. Therefore, the inner end face 22A is orthogonal to the third axis Z. The inner end face 22A is flush with the inner end face 21B of the main body portion 21.

[0035] The opposing face 22B is the face of the bottom surface side protruding portion 22 facing the first positive direction X1 side. That is, the opposing face 22B is the top face of the bottom surface side protruding portion 22. The opposing face 22B is located on the most first positive direction X1 side of the first flange portion 20. The opposing face 22B is adjacent to the inner end face 22A on the first positive direction X1 side. The opposing face 22B is orthogonal to the first axis X. The opposing face 22B faces the mounting portion 430 of the first metal terminal 41 described later.

[0036] The first inclined face 22C is the face of the bottom surface side protruding portion 22 facing the third positive direction Z1 side and the first positive direction X1 side. The first inclined face 22C is adjacent to the opposing face 22B on the third positive direction Z1 side. In the present embodiment, the first inclined face 22C is planar. The first inclined face 22C has a greater distance from the opposing face 22B in the direction parallel to the first axis X as it goes in the third positive direction Z1 side.

[0037] In the present embodiment, the inclination angle of the first inclined face 22C is approximately 45 degrees. Also, the average inclination angle of the first inclined face 22C is also approximately 45 degrees. Here, the inclination angle refers to the acute angle side of the angle formed by the virtual plane including the opposing face 22B and the virtual plane including the first inclined face 22C. Also, the average inclination angle here is defined as follows. That is, the inclination angle with respect to the virtual plane parallel to the opposing face 22B at the edge of the first inclined face 22C on the most third positive direction Z1 side is calculated. Also, the inclination angle with respect to the virtual plane parallel to the opposing face 22B at the edge of the first inclined face 22C on the most third negative direction Z2 side is calculated. Further, the inclination angle with respect to the virtual plane parallel to the opposing face 22B at the center in the direction along the third axis Z of the first inclined face 22C is calculated. The average of these three inclination angles is taken as the average inclination angle. In the following description, the inclination angle and the average inclination angle are calculated in the same manner.

[0038] The first flat surface 22F is adjacent to the first inclined surface 22C on the side of the third positive direction Z1. The first flat surface 22F is planar. In the present embodiment, the inclination angle of the first flat surface 22F is 0 degrees. Therefore, the inclination angle of the first flat surface 22F is smaller than the average inclination angle of the first inclined surface 22C.

[0039] The chamfered surface 22H is adjacent to the first flat surface 22F on the side of the third positive direction Z1. In the present embodiment, the chamfered surface 22H is a curved surface that protrudes in the third positive direction Z1 and the first positive direction X1. The average inclination angle of the chamfered surface 22H is approximately 45 degrees. That is, the average inclination angle of the chamfered surface 22H is larger than the inclination angle of the first flat surface 22F.

[0040] The outer end surface 22D is adjacent to the chamfered surface 22H on the side of the first negative direction X2. The outer end surface 22D is the surface facing the third positive direction Z1 in the bottom surface side protrusion 22. Therefore, the outer end surface 22D is orthogonal to the third axis Z. The outer end surface 22D is flush with the outer end surface 21A of the main body portion 21. The outer end surface 22D and the outer end surface 21A of the main body portion 21 together form an adhesive surface AS to which the adhesive portion 410 of the first metal terminal 41 described later is adhered.

[0041] As shown in FIG. 4, one of the two second inclined surfaces 22E, one of the two second flat surfaces 22G, and one of the two side end surfaces 22I are located on the side of the second positive direction Y1 with respect to the opposing surface 22B. Hereinafter, the second inclined surface 22E, the second flat surface 22G, and the side end surface 22I on the side of the second positive direction Y1 will be described.

[0042] The second inclined surface 22E is a surface facing the second positive direction Y1 side and the first positive direction X1 side. The second inclined surface 22E is adjacent to the opposing surface 22B on the third negative direction Z2 side. Also, the second inclined surface 22E is adjacent to the first inclined surface 22C on the second positive direction Y1 side. In the present embodiment, the second inclined surface 22E is planar. The distance from the opposing surface 22B in the direction parallel to the first axis X increases as the second inclined surface 22E moves away from the opposing surface 22B. The inclination angle of the second inclined surface 22E is approximately 45 degrees. Also, the average inclination angle of the second inclined surface 22E is also approximately 45 degrees.

[0043] The second flat surface 22G is adjacent to the second inclined surface 22E on the second positive direction Y1 side, that is, on the side opposite to the opposing surface 22B. Also, the second flat surface 22G is continuous with the first flat surface 22F. The second flat surface 22G is planar. In the present embodiment, the inclination angle of the second flat surface 22G is 0 degrees. Therefore, the inclination angle of the second flat surface 22G is smaller than the average inclination angle of the second inclined surface 22E.

[0044] The side end surface 22I is adjacent to the second flat surface 22G on the first negative direction X2 side. The side end surface 22I is a surface facing the second positive direction Y1 side of the bottom surface side protrusion 22. Therefore, the side end surface 22I is orthogonal to the second axis Y. The side end surface 22I is connected to the bottom surface 21C of the main body portion 21.

[0045] Note that the other one of the two second inclined surfaces 22E, the other one of the two second flat surfaces 22G, and the other one of the two side end surfaces 22I are located on the second negative direction Y2 side with respect to the opposing surface 22B. The shapes of the second inclined surface 22E, the second flat surface 22G, and the side end surface 22I on the second negative direction Y2 side and the shapes of the second inclined surface 22E, the second flat surface 22G, and the side end surface 22I on the second positive direction Y1 side are symmetric shapes in the direction along the second axis Y.

[0046] <Regarding the end surface side protrusion> Hereinafter, the end face side protrusion 23 in the first flange portion 20 will be described as a representative. Note that the end face side protrusion 33 on the second flange portion 30 side has a symmetrical shape in a direction parallel to the third axis Z with respect to the end face side protrusion 23 in the first flange portion 20. The end face side protrusion 23 is a first protrusion that protrudes from the outer end face 21A opposite to the surface connected to the core portion 11 in the main body portion 21.

[0047] As described above, the end face side protrusion 23 protrudes outward from the outer end face 21A of the main body portion 21. Also, as shown in FIG. 5, the end face side protrusion 23 extends over the entire main body portion 21 and a part on the first negative direction X2 side of the bottom face side protrusion 22 in a direction parallel to the first axis X. Specifically, the end face side protrusion 23 extends from the end on the first negative direction X2 side of the main body portion 21 to the first flat face 22F of the bottom face side protrusion 22. That is, the opposing face 22B of the bottom face side protrusion 22 is located on the first positive direction X1 side with respect to the portion of the end face side protrusion 23 that is located most on the first positive direction X1 side. The end face side protrusion 23 is located substantially at the center in the direction along the second axis Y of the main body portion 21. The dimension of the end face side protrusion 23 in the direction parallel to the second axis Y is smaller than the maximum dimension of the bottom face side protrusion 22 in the direction parallel to the second axis Y. Note that the top plate 12 is not shown in FIG. 5.

[0048] As shown in FIG. 8, the boundary portion 23A between the end face side protrusion 23 and the outer end face 21A has a chamfered shape. When viewed facing the first negative direction X2, the boundary portion 23A between the end face side protrusion 23 and the outer end face 21A is a curved surface that is convex toward the center side and the third negative direction Z2 side of the end face side protrusion 23. That is, the chamfered shape is an R chamfered shape.

[0049] <Regarding the first metal terminal> As shown in FIG. 6, the first metal terminal 41 is plate-shaped. More specifically, the first metal terminal 41 is plate-shaped and curved at multiple locations. The first metal terminal 41 is attached to the first flange portion 20. The first metal terminal 41 has an adhesive portion 410, a connecting portion 420, a mounting portion 430, an extending portion 440, and a joining portion 450. Note that the adhesive portion 410, the connecting portion 420, the mounting portion 430, the extending portion 440, and the joining portion 450 are integrally formed. Specifically, the first metal terminal 41 is formed by bending a single sheet of plate material. Therefore, there is no clear boundary between these members inside the first metal terminal 41.

[0050] As shown in FIG. 5, the adhesive portion 410 is substantially rectangular plate-shaped. As shown in FIG. 3, the adhesive portion 410 is adhered to the adhesive surface AS of the first flange portion 20 via an adhesive 60. That is, the adhesive portion 410 is adhered to the surface facing outward among the outer surfaces of the first flange portion 20. As shown in FIG. 5, when viewed in the direction of the third negative direction Z2, the corners on the first positive direction X1 side and the second positive direction Y1 side of the adhesive portion 410 are rounded. On the other hand, the corners on the second positive direction Y1 side and the first negative direction X2 side of the adhesive portion 410 are substantially right angles. That is, the corners located on the second positive direction Y1 side of the adhesive portion 410 and close to the top surface 21D have a greater curvature than the corners located on the second positive direction Y1 side of the adhesive portion 410 and close to the bottom surface 21C.

[0051] The adhesive portion 410 is located closer to the first positive direction X1 side of the main body portion 21 of the first flange portion 20. That is, the shortest distance from the edge on the first positive direction X1 side of the adhesive portion 410 to the bottom surface 21C of the main body portion 21 is shorter than the shortest distance from the edge on the first negative direction X2 side of the adhesive portion 410 to the top surface 21D of the main body portion 21.

[0052] The maximum dimension in the direction parallel to the second axis Y of the adhesive portion 410 is less than or equal to half of the maximum dimension in the direction parallel to the second axis Y of the first flange portion 20. In the present embodiment, the dimension in the direction parallel to the second axis Y of the adhesive portion 410 is less than or equal to half of the dimension in the direction parallel to the second axis Y of the main body portion 21.

[0053] The connecting part 420 is adjacent to the bonding part 410 on the first positive direction X1 side. Specifically, the connecting part 420 extends from the end of the bonding part 410 in the second negative direction Y2 in the first positive direction X1. When viewed facing the third negative direction Z2, the connecting part 420 is substantially rectangular. The dimension of the connecting part 420 in the direction along the second axis Y is smaller than the dimension of the bonding part 410 in the direction along the second axis Y. The dimension of the connecting part 420 in the direction along the second axis Y is substantially constant except for the boundary part with the bonding part 410. On the other hand, the edge of the connecting part 420 on the second negative direction Y2 side extends parallel to the first axis X on the same straight line as the edge of the bonding part 410 on the second negative direction Y2 side. When viewed in the direction facing the first positive direction X1 side of the end of the connecting part 420, it protrudes from the first flange part 20 in the first positive direction X1. In FIG. 5, the boundary between the connecting part 420 and the bonding part 410 is virtually shown by a broken line.

[0054] As shown in FIG. 4, the part of the connecting part 420 that protrudes in the first positive direction X1 with respect to the first flange part 20 is bent about 90 degrees in the middle. The bent part is rounded. The end of the connecting part 420 on the side opposite to the bonding part 410 faces the third negative direction Z2.

[0055] As shown in FIG. 4, the mounting part 430 is connected to the end of the connecting part 420 on the side opposite to the bonding part 410. That is, the connecting part 420 connects the mounting part 430 and the bonding part 410. The mounting part 430 is flat. The main surface of the mounting part 430 is orthogonal to the first axis X. That is, the main surface of the mounting part 430 is orthogonal to the main surface of the part of the connecting part 420 that extends along the first axis X. The dimension of the mounting part 430 in the direction parallel to the second axis Y is the same as the dimension of the connecting part 420 in the direction parallel to the second axis Y. The edge of the mounting part 430 on the second negative direction Y2 side is in a straight line with the edge of the connecting part 420 on the second negative direction Y2 side and extends parallel to the third axis Z.

[0056] Further, the mounting portion 430 is the portion of the first metal terminal 41 that is located on the most X1 side in the first positive direction. The mounting portion 430 is separated from the opposing surface 22B 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 first flange portion 20. Note that the mounting portion 430 and the opposing surface 22B face each other. The mounting portion 430 is the portion that faces the substrate when mounting the coil component 10 on the substrate.

[0057] As shown in FIG. 3, the shortest distance W1 from the mounting portion 430 to the first flange portion 20 in the direction parallel to the first axis X is greater than the minimum dimension W2 of the mounting portion 430 in the direction parallel to the first axis X. Also, the shortest distance W1 from the mounting portion 430 to the first flange portion 20 in the direction parallel to the first axis X is greater than the minimum dimension MS in the direction parallel to the central axis C from the inner end of the first inclined surface 22C to the outer end surface 21A. The minimum dimension MS in the direction parallel to the central axis C from the inner end of the first inclined surface 22C to the outer end surface 21A is, for example, 200 μm. In the present embodiment, the dimension of the mounting portion 430 in the direction along the first axis X is the thickness dimension of the mounting portion 430. Note that the thickness dimension indicates the plate thickness of the first metal terminal 41. More specifically, the thickness dimension is the shortest distance from a specific point on the outer surface of the first metal terminal 41 to the outer surface on the side opposite to the outer surface where the specific point is located. The thickness dimension of the mounting portion 430 is substantially constant.

[0058] As shown in FIG. 4, the extending portion 440 is connected to the end of the mounting portion 430 on the Y1 side in the second positive direction. The extending portion 440 extends generally obliquely from the mounting portion 430 in the second positive direction Y1 and the first negative direction X2. The dimension of the extending portion 440 in the direction along the third axis Z, that is, the width dimension of the extending portion 440, is substantially constant.

[0059] The extension part 440 has a first part 441 and a second part 442. The first part 441 is a part of the extension part 440 on the side of the mounting part 430. Also, the second part 442 is a part of the extension part 440 on the side far from the mounting part 430. Note that the first part 441 is also located at the connection location with the mounting part 430. Also, the second part 442 is also located at the connection location between the extension part 440 and a joint part 450 described later. The thickness dimension of the first part 441 is substantially the same as the thickness dimension of the mounting part 430. On the other hand, the thickness dimension of the second part 442 is smaller than the thickness dimension of the first part 441. Therefore, the second part 442 is a thin part with a thickness dimension smaller than the thickness dimension of the mounting part 430.

[0060] The surface of the first part 441 facing the first flange part 20 is flush with the surface of the second part 442 facing the first flange part 20. On the other hand, the surface of the second part 442 facing the second positive direction Y1 side is located on the second negative direction Y2 side with respect to the surface of the first part 441 facing the second positive direction Y1.

[0061] The extension part 440 extends so as to approach the bottom surface 21C of the main body part 21 as it goes in the second positive direction Y1. A gap is formed between the extension part 440 and the first flange part 20 in the direction parallel to the second axis Y. Specifically, a gap is formed between the extension part 440 and the bottom surface side protruding part 22 in the direction parallel to the second axis Y.

[0062] The joint part 450 is connected to the end of the extension part 440 on the first negative direction X2 side. The joint part 450 is generally plate-shaped. The joint part 450 has a plate body 451 and a joint protrusion 452. When viewed in the direction along the first axis X, the plate body 451 is in a substantially rectangular shape elongated in the third axis Z direction. The maximum dimension of the plate body 451 in the direction parallel to the third axis Z is larger than the maximum dimension of the extension part 440 in the direction parallel to the third axis Z. A part of the surface of the plate body 451 facing the first positive direction X1 side and on the third negative direction Z2 side is an inclined surface. That is, the thickness dimension of a part of the plate body 451 on the third negative direction Z2 side becomes smaller toward the third negative direction Z2 side. Note that the thickness dimension of the part of the plate body 451 where the inclined surface is not formed is substantially the same as the thickness dimension of the second part 442.

[0063] As shown in FIG. 4, the plate body 451 faces the bottom surface 21C of the main body part 21 of the first flange part 20 from the first positive direction X1 side. The surface of the joint part 450 facing the first negative direction X2 is in contact with the bottom surface 21C. On the other hand, the surface of the plate body 451 facing the first negative direction X2 is not fixed to the bottom surface 21C.

[0064] As shown in FIG. 7, the joint protrusion 452 protrudes from the surface of the plate body 451 facing the first positive direction X1 to the first positive direction X1 side. The joint protrusion 452 has a smaller dimension in the direction parallel to the third axis Z as it goes in the first positive direction X1. Also, the joint protrusion 452 has a smaller dimension in the direction parallel to the second axis Y as it goes in the first positive direction X1. That is, the joint protrusion 452 is in a substantially frustum-of-a-square-pyramid shape. When viewed in the first negative direction X2, the geometric center G2 of the joint protrusion 452 is located on the outer side and on the side opposite to the extension part 440 with respect to the geometric center G1 of the joint part 450. Specifically, the joint protrusion 452 protrudes from the corner part of the plate body 451 on the second positive direction Y1 side and the third positive direction Z1 side. Note that the first wire end of the first wire 51 is joined to the surface of the joint protrusion 452 facing the first positive direction X1.

[0065] <Regarding the surface on the third negative direction side of the first metal terminal> As shown in FIG. 6, the first metal terminal 41 has a depression 401. As shown in FIG. 3, the depression 401 is recessed with respect to the surface of the bonding portion 410 facing the third negative direction Z2. Further, the depression 401 is recessed with respect to the surface of the connecting portion 420 facing the third negative direction Z2. That is, as shown in FIG. 6, the depression 401 straddles both the bonding portion 410 and the connecting portion 420. The depression 401 extends over the entire region in the direction parallel to the second axis Y in the bonding portion 410. Also, as shown in FIG. 3, the end of the depression 401 on the first positive direction X1 side is located on the first negative direction X2 side with respect to the end of the bonding surface AS on the first positive direction X1 side. As shown in FIG. 6, the end of the depression 401 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 on the first negative direction X2. An adhesive 60 is accommodated in the depression 401. Note that the adhesive 60 may protrude from the depression 401.

[0066] As shown in FIG. 6, among the first metal terminals 41, the central side edge 402, which is the edge on the second negative direction Y2 side and close to the first flange portion 20, has a chamfered shape. Specifically, on the surface of the first metal terminal 41 facing the first flange portion 20 side, the edge on the second negative direction Y2 side has a chamfered shape except for the depression 401. The central side edge 402 has a shape in which the corners are cut obliquely. That is, the central side edge 402 has so-called C-chamfering. Here, the chamfering dimension is defined as follows. That is, in the case of C-chamfering, the chamfering dimension is 1 / √2 times the dimension of the chamfered hypotenuse. Also, in the case of R-chamfering, the chamfering dimension is the radius of the chamfered shape.

[0067] <Regarding the second metal terminal to the fourth metal terminal> As shown in FIG. 1, the second metal terminal 42 has a shape inverted in the direction along the second axis Y with respect to the first metal terminal 41. The third metal terminal 43 has the same shape as the second metal terminal 42. The fourth metal terminal 44 has the same shape as the first metal terminal 41. That is, the second metal terminal 42 to the fourth metal terminal 44 have the same configuration as the above-described bonding portion 410, connecting portion 420, mounting portion 430, extending portion 440, and joining portion 450.

[0068] <Relationship between the first metal terminal and the end surface side protrusion> As described above, a gap is formed between the extending portion 440 and the first flange portion 20 in a direction parallel to the second axis Y. Specifically, a gap is formed between the extending portion 440 and the bottom surface side protrusion 22. Also, a gap is formed between the joint portion 450 and the first flange portion 20 in a direction parallel to the second axis Y. Specifically, a gap is formed between the joint portion 450 and the bottom surface side protrusion 22.

[0069] As shown in FIG. 5, when viewed in the direction of the third negative direction Z2, the edge on the second negative direction Y2 side of the first metal terminal 41 is in surface contact with the end surface side protrusion 23. Specifically, as shown in FIG. 8, the surface on the second positive direction Y1 side of the end surface side protrusion 23 and the surface on the second negative direction Y2 side of the first metal terminal 41 are in contact. Also, as described above, the first metal terminal 41 has a central side edge 402. The chamfer dimension of the central side edge 402 is larger than the chamfer dimension of the boundary portion 23A between the end surface side protrusion 23 and the outer end surface 21A. Therefore, the central side edge 402 of the first metal terminal 41 and the boundary portion 23A of the end surface side protrusion 23 are not in contact.

[0070] Also, among the first metal terminals 41, in a direction parallel to the second axis Y, let the shortest distance from the end on the second positive direction Y1 side of the end surface side protrusion 23 to the joint portion 450 be the first distance P1. Also, in a direction parallel to the second axis Y, let the maximum distance from the end on the second positive direction Y1 side of the end surface side protrusion 23 to the end on the second positive direction Y1 side of the bottom surface side protrusion 22, that is, the side end surface 22I, be the second distance P2. The first distance P1 is larger than the second distance P2.

[0071] Also, here, among the first metal terminals 41, in a direction parallel to the second axis Y, let the shortest distance from the end on the second positive direction Y1 side of the end surface side protrusion 23 to the extending portion 440 be the third distance P3. The third distance P3 is larger than the second distance P2.

[0072] Note that the positional relationship between the second metal terminal 42 and the end face side protruding portion 23 is the same as the positional relationship between the first metal terminal 41 and the end face side protruding portion 23. Also, the positional relationships between the third metal terminal 43 and the end face side protruding portion 33, and between the fourth metal terminal 44 and the end face side protruding portion 33 are the same as the positional relationship between the first metal terminal 41 and the end face side protruding portion 23.

[0073] Also, as shown in FIG. 8, when viewed in the direction of the first negative direction X2, the outermost portion of the bonding portion 410 of the first metal terminal 41 is located on the outer side with respect to the outermost portion of the end face side protruding portion 23.

[0074] <Regarding Thermocompression Bonding> When joining the first wire 51 to the joining portion 450, first, the first wire end of the first wire 51 is placed on the joining protrusion 452 of the first metal terminal 41. Then, a jig is pressed against the first wire 51 so as to be parallel to the surface of the joining protrusion 452 facing the first positive direction X1 side. Due to the heat and external force of the jig, the first wire end of the first wire 51 is joined to the joining protrusion 452. When pressing the jig in this way, the first metal terminal 41 may be deformed. Also, due to the heat from the jig, the insulating coating may deteriorate in the vicinity of the first wire end of the first wire 51. Note that the second wire end of the first wire 51 and the tips of the second wire 52 are also thermocompression bonded in the same manner.

[0075] <Effects of the Present Embodiment> Hereinafter, regarding the effects 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. Also, regarding the effects common to the first flange portion 20 and the second flange portion 30, only the first flange portion 20 will be described.

[0076] (1) According to the above embodiment, the second portion 442 of the extension portion 440 is more easily deformed than the mounting portion 430. As described above, when joining the first wire 51 to the joining portion 450, an external force acts on the joining portion 450 by the jig. At this time, the deformation of the second portion 442 makes it difficult for the influence of the external force to be transmitted to the mounting portion 430. As a result, the deformation of the mounting portion 430 can be suppressed.

[0077] (2) In the above embodiment, the second portion 442 is located at the connection location with the joint portion 450 in the extension portion 440. According to this configuration, the external force applied to the joint portion 450 can be absorbed at a location farther from the mounting portion 430. Therefore, the deformation of the mounting portion 430 can be suppressed more effectively.

[0078] (3) In the above embodiment, the joint portion 450 includes a joint protrusion 452. And the first wire 51 is thermocompression bonded to the joint protrusion 452. Therefore, according to the above configuration, while the first wire 51 is strongly sandwiched between the joint protrusion 452 and the jig, it is not so strongly sandwiched between the plate body 451 and the jig. As a result, compared with the configuration without the joint protrusion 452, the deterioration of the insulating coating of the first wire 51 that may occur during thermocompression bonding is confined only to the vicinity of the joint protrusion 452. That is, the region where the deterioration of the insulating coating of the first wire 51 may occur can be reduced.

[0079] (4) In the above embodiment, the geometric center G1 of the joint protrusion 452 is located on the outer side with respect to the geometric center G2 of the joint portion 450 and on the side opposite to the extension portion 440. That is, the joint protrusion 452 is located at a location far from the bobbin core portion 11 in the joint portion 450. According to this position of the joint protrusion 452, it is easy to join the end of the first wire end of the first wire 51 drawn out from the bobbin core portion 11.

[0080] (5) In the above embodiment, the thickness dimension of the first portion 441 is larger than the thickness dimension of the second portion 442. Also, the first portion 441 is located at the connection location with the mounting portion 430 in the extension portion 440. According to this configuration, the first portion 441 is less likely to deform than the second portion 442. Therefore, compared with the configuration in which the extension portion 440 does not have the second portion 442, the mounting posture of the coil component 10 is stabilized when the mounting portion 430 is attached to the substrate with solder or the like.

[0081] <Modification Example> This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically consistent range. For modification examples common to the first to fourth metal terminals 41 to 44, only the first metal terminal 41 will be described as a representative. Also, for modification examples common to the first flange portion 20 and the second flange portion 30, only the first flange portion 20 will be described.

[0082] · In the above embodiment, the configuration of the coil component 10 is not limited. For example, the top plate 12 of the coil component 10 can be omitted. Also, the shape of the first flange portion 20 is not limited to the shape of the above embodiment. For example, the bottom surface side protrusion 22 and the end surface side protrusion 23 of the first flange portion 20 can be omitted.

[0083] · In the above embodiment, the coil component 10 may omit the second wire 52. For example, when the coil component 10 only has the first wire 51, one metal terminal may be attached to each flange portion.

[0084] · In the above embodiment, the bobbin portion 11 does not have to be quadrangular prism-shaped. For example, the cross-sectional shape of the bobbin portion 11 may be circular, elliptical, or a polygonal shape other than a quadrilateral. · 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 include a mounting portion 430, an extension portion 440, and a joining portion 450.

[0085] · In the above embodiment, the extension portion 440 does not have to be directly connected to the mounting portion 430. For example, an adhesive portion 410 may be located between the extension portion 440 and the mounting portion 430.

[0086] · In the above embodiment, the shortest distance W1 from the mounting portion 430 to the opposing surface 22B may be smaller than or equal to the minimum dimension W2 of the mounting portion 430 in the direction along the first axis X.

[0087] ·In the above embodiment, if the mounting portion 430 is located on the first positive direction X1 side with respect to the opposing surface 22B, it may be in contact with the opposing surface 22B. ·In the above embodiment, the joint portion 450 may be separated from the bottom surface 21C. Further, an adhesive 60 may be accommodated between the joint portion 450 and the bottom surface 21C.

[0088] ·In the above embodiment, the inclination angle of the first flat surface 22F is not limited to the example of the above embodiment. However, when forming the drum core 10C with a mold or the like, in order to suppress the collapse of the mold such as the first inclined surface 22C, the inclination angle of the first flat surface 22F is preferably smaller than the average inclination angle of the first inclined surface 22C. Further, the first flange portion 20 may omit the first flat surface 22F.

[0089] ·In the above embodiment, when the inclination angle of the first flat surface 22F is positive, the average inclination angle of the chamfered surface 22H may be smaller than the average inclination angle of the first flat surface 22F. Further, in the first flange portion 20, the chamfered surface 22H may be omitted.

[0090] ·In the above embodiment, the shortest distance W1 from the mounting portion 430 to the first flange portion 20 in the direction parallel to the first axis X may be smaller than the minimum dimension MS in the direction parallel to the central axis C from the inner end of the first inclined surface 22C to the outer end surface 21A.

[0091] ·In the above embodiment, the minimum dimension MS in the direction parallel to the central axis C from the inner end of the first inclined surface 22C to the adhesive surface AS is not limited to the example of the above embodiment. On the other hand, in order to prevent the adhesive 60 from reaching the opposing surface 22B, the minimum dimension MS is preferably 100 μm or more. Further, in order to ensure the strength of the first flange portion 20, the minimum dimension MS is preferably 300 μm or less.

[0092] ·In the above embodiment, further, in the first flange portion 20, there may be only one second inclined surface 22E. Also, the second inclined surface 22E may be omitted. ·In the above embodiment, the inclination angle of the second flat surface 22G is not limited to the example of the above embodiment. However, when forming the drum core 10C with a mold or the like, in order to suppress mold collapse of the second inclined surface 22E or the like, the inclination angle of the second flat surface 22G is preferably smaller than the average inclination angle of the second inclined surface 22E. Further, the first flange portion 20 may omit the second flat surface 22G.

[0093] ·In the above embodiment, the first inclined surface 22C and the second inclined surface 22E do not have to be planar. For example, the first inclined surface 22C and the second inclined surface 22E may be curved surfaces. Further, the first inclined surface 22C, the second inclined surface 22E, and the chamfered surface 22H may be subjected to barrel processing or the like and may be curved surfaces with non-uniform curvature.

[0094] ·In the above embodiment, the adhesive portion 410 may be adhered to a surface of the main body portion 21 other than the opposing surface 22B. For example, the adhesive portion 410 may be adhered to the inner end surface 21B of the main body portion 21.

[0095] ·In the above embodiment, the depression 401 of the first metal terminal 41 can be omitted. ·In the above embodiment, the extending portion 440 may be in contact with the bottom surface side protrusion 22. Further, the joining portion 450 may be in contact with the bottom surface side protrusion 22.

[0096] ·In the above embodiment, the first flange portion 20 can omit the first inclined surface 22C. Further, the bottom surface side protrusion 22 may be substantially rectangular parallelepiped. Further, in the first flange portion 20, the bottom surface side protrusion 22 may be omitted.

[0097] ·In the above embodiment, the extending portion 440 may be in contact with the bottom surface side protrusion 22. Further, the joining portion 450 may be in contact with the bottom surface side protrusion 22. ·In the above embodiment, if the thickness dimension of the second portion 442 is smaller than that of the mounting portion 430, its shape is not limited. For example, among the second portion 442, the surface facing the second positive direction Y1 side may be flush with the surface facing the second positive direction Y1 side of the first portion 441. In this case, the surface of the second portion 442 facing the first flange portion 20 may be shaped to be recessed with respect to the surface of the first portion 441 facing the first flange portion 20. Further, the second portion 442 may not have a surface flush with the first portion 441.

[0098] ·In the above embodiment, the position of the portion of the extension portion 440 that is smaller than the thickness dimension of the mounting portion 430, that is, the position of the thin portion is not limited. For example, the thin portion may be located at the center in the extension direction of the extension portion 440, or may be located at the connection portion of the extension portion 440 with the mounting portion 430.

[0099] ·In the above embodiment, the first portion 441 of the extension portion 440 can be omitted. That is, the overall thickness dimension of the extension portion 440 may be smaller than the thickness dimension of the mounting portion 430.

[0100] ·In the above embodiment, the position of the joining protrusion 452 is not limited to the example of the above embodiment. For example, the geometric center G1 of the joining protrusion 452 may be located on the inner side and closer to the extension portion 440 with respect to the geometric center G2 of the joining portion 450. Further, the geometric center G1 of the joining protrusion 452 may coincide with the geometric center G2 of the joining portion 450.

[0101] ·In the above embodiment, the shape of the joining protrusion 452 is not limited to the example of the above embodiment. For example, the joining protrusion 452 may be substantially columnar. ·In the above embodiment, the joining portion 450 may not include the joining protrusion 452.

[0102] · In the above embodiment, the joining mode of the first wire end of the first wire 51 to the first metal terminal 41 is not limited to thermocompression bonding. For example, the first wire end may be joined to the first metal terminal 41 by laser welding or the like. This also applies to the second wire 52.

[0103] · In the above embodiment, the boundary portion 23A between the end face side protruding portion 23 and the outer end face 21A of the main body portion 21 does not have to be chamfered. That is, the boundary portion 23A may be linear instead of curved.

[0104] · In the above embodiment, also, the chamfering dimension of the central side edge 402 may be the same as or smaller than the chamfering dimension of the boundary portion 23A. · In the above embodiment, among the first metal terminals 41, the edge on the side closer to the first flange portion 20 and on the second negative direction Y2 side does not have to be chamfered.

[0105] · In the above embodiment, the adhesive portion 410 and the end face side protruding portion 23 may be in line contact instead of surface contact. Also, the adhesive portion 410 and the end face side protruding portion 23 may not be in contact. · In the above embodiment, in the direction parallel to the first axis X, the position of the portion of the end face side protruding portion 23 that is located most in the first positive direction X1 and the opposing surface 22B may be the same.

[0106] · In the above embodiment, the outermost portion of the adhesive portion 410 may be located on the inner side with respect to the outermost portion of the end face side protruding portion 23. Also, the outermost portion of the adhesive portion 410 and the outermost portion of the end face side protruding portion 23 may be located on the same plane.

[0107] The technical idea derivable from the above embodiment and modification examples is described below. [1] A drum core having a columnar core part, a first flange part connected to a first end in a direction parallel to the central axis of the core part, and a second flange part connected to a second end on the opposite side of the first end in the core part, a plate-shaped first metal terminal attached to the first flange part, and a wire wound around the core part with a first wire end joined to the first metal terminal. When a specific axis perpendicular to the central axis is defined as the first axis and one of the directions parallel to the first axis is defined as the first positive direction, the first flange part protrudes outward with respect to the core part in the first positive direction, the first metal terminal has a joint part to which the first wire end of the wire is connected, a mounting part located on the most first positive direction side of the first metal terminal, and an extension part connecting the mounting part and the joint part, the first wire end is joined to a surface of the joint part facing the first positive direction side, and the extension part has a thin-walled part with a thickness dimension smaller than the thickness dimension of the mounting part, which is a coil component.

[0108] [2] The coil component according to [1], wherein the thin-walled part is located at a connection portion of the extension part with the joint part. [3] The joint part faces a surface of the first flange part facing the first positive direction, the joint part includes a plate body facing the surface of the first flange part facing the first positive direction, and a joint protrusion protruding in the first positive direction from a surface of the plate body facing the first positive direction side, and the first wire end of the wire is joined to a surface of the joint protrusion facing the first positive direction side, which is the coil component according to [1] or [2].

[0109] [4] When the direction from the core part to the first flange part in the direction parallel to the central axis is defined as the outward direction and the joint part is viewed in plan view facing the direction parallel to the first axis, the geometric center of the joint protrusion is located on the outward direction side and on the opposite side of the extension part with respect to the geometric center of the joint part, which is the coil component according to [3].

[0110] [5] The thin-walled portion is located at the connection point of the extending portion with the joint portion, and the connection point of the extending portion with the mounting portion has a larger thickness dimension than the thin-walled portion. The coil component according to any one of [1] to [4].

Explanation of Signs

[0111] C…Central axis 10…Coil component 10C…Drum core 11…Bobbin core portion 20…First flange portion 30…Second flange portion 41…First metal terminal 51…First wire 430…Mounting portion 440…Extending portion 441…First part 442…Second part 450…Joint portion 451…Plate body 452…Joint protrusion

Claims

1. A drum core having a columnar winding core portion, a first flange portion connected to a first end in a direction parallel to the central axis of the winding core portion, and a second flange portion connected to a second end on the opposite side of the first end in the winding core portion, A plate-shaped first metal terminal attached to the first flange portion, A wire wound around the winding core portion with a first wire end joined to the first metal terminal, Comprising: When a specific axis orthogonal to the central axis is defined as the first axis, one of the directions parallel to 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 flange portion protrudes outward with respect to the winding core portion in the first positive direction, The first metal terminal, A joint portion to which the first wire end of the wire is connected, A mounting portion located on the most first positive direction side of the first metal terminal, An extending portion connecting the mounting portion and the joint portion, Having: The first wire end is joined to a surface facing the first positive direction side at the joint portion, The extending portion has a thin-walled portion with a thickness dimension smaller than the thickness dimension of the mounting portion, The thin-walled portion extends toward the first negative direction side from the mounting portion side toward the joint portion side Coil component.

2. The thin-walled portion is located at a connection portion of the extending portion with the joint portion The coil component according to claim 1.

3. The joint portion faces a surface of the first flange portion facing the first positive direction, The joint portion includes a plate body facing a surface of the first flange portion facing the first positive direction, and a joint protrusion protruding in the first positive direction from a surface of the plate body facing the first positive direction side, The first wire end of the wire is joined to a surface of the joint protrusion facing the first positive direction side The coil component according to claim 1.

4. The thin-walled portion is located at a connection portion of the extending portion with the joint portion, The connection portion of the extending portion with the mounting portion has a larger thickness dimension than the thin-walled portion The coil component according to claim 1.

5. A drum core having a columnar winding core portion, a first flange portion connected to a first end in a direction parallel to the central axis of the winding core portion, and a second flange portion connected to a second end on the opposite side of the first end in the winding core portion, A plate-shaped first metal terminal attached to the first flange portion, A wire wound around the winding core portion with a first wire end joined to the first metal terminal, Comprising: When a specific axis orthogonal to the central axis is defined as the first axis and one of the directions parallel to the first axis is defined as the first positive direction, the first flange portion protrudes outward with respect to the core portion in the first positive direction, the first metal terminal has a joint portion to which the first wire end of the wire is connected, a mounting portion located on the most first positive direction side of the first metal terminal, and an extending portion connecting the mounting portion and the joint portion, and has the first wire end is joined to a surface facing the first positive direction side at the joint portion, the extending portion has a thin portion with a thickness dimension smaller than the thickness dimension of the mounting portion, the joint portion faces a surface facing the first positive direction of the first flange portion, the joint portion includes a plate body facing a surface facing the first positive direction of the first flange portion and a joint protrusion protruding in the first positive direction from a surface facing the first positive direction side of the plate body, the first wire end of the wire is joined to a surface facing the first positive direction side of the joint protrusion, when the direction from the core portion toward the first flange portion among the directions parallel to the central axis is defined as the outward direction, when the joint portion is viewed in a plan view facing a direction parallel to the first axis, the geometric center of the joint protrusion is located on the outward direction side and on the side opposite to the extending portion with respect to the geometric center of the joint portion coil component.

Images