Coil component

Abstract

To suppress reduction in mounting strength of a coil component.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 an adhesive part 410, a coupling part 420, and a mounting part 430. The adhesive part 410 is adhered to the first flange part 20 via an adhesive agent 60. The mounting part 430 is located on the most first positive direction X1 side of the first metal terminal 41 so as to be separated from the first flange part 20 toward the first positive direction X1 side. The coupling part 420 connects between the adhesive part 410 and the mounting part 430. The first flange part 20 has an opposing surface 22B and an adhesive surface AS. The opposing surface 22B faces the mounting part 430. The first flange part 20 has a first inclined surface 22C between the opposing surface 22B and the adhesive surface AS, where the distance from the opposing surface 22B increases in a direction parallel to a first axis X as it goes toward the adhesive surface AS.SELECTED DRAWING: Figure 3

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 rectangular prism-shaped. 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 flange portions form the 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 furthest from the metal terminals toward 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 facing the first positive direction via an adhesive. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-89804 Summary of the Invention [Problem to be solved by the invention]

[0005] A coil component such as that 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, the thermal expansion coefficient of the coil component differs from that of the substrate or the like, resulting in a difference in the degree of thermal deformation between the two. Therefore, with temperature changes, force acts on the solder interposed between the mounting portion of the metal terminal and the substrate or the like. As a result, cracks or the like may occur in the solder between the mounting portion of the metal terminal and 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 joining method. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention provides a drum core including a columnar winding core, a first flange connected to a first end of the winding core in a direction parallel to a central axis thereof, and a second flange connected to a second end of the winding core opposite to the first end thereof, a first metal terminal attached to the first flange, and a wire wound around the winding core and having a first wire end joined to the first metal terminal, wherein a specific axis perpendicular to the central axis is defined as a first axis, and one of the directions parallel to the first axis is defined as a first positive direction, and the first flange protrudes outward from the winding core in the first positive direction, and a front end of the drum core is connected to the first metal terminal. The first metal terminal has an adhesive portion that is adhered to the first flange portion via an adhesive, a mounting portion that is located closest to the first positive side of the first metal terminal and is farthest from the first flange portion in the first positive direction, and a connecting portion that connects the adhesive portion and the mounting portion, and the first flange portion has an opposing surface that faces the mounting portion and an adhesive surface to which the adhesive portion is adhered, and the first flange portion is a coil component that has an inclined surface between the opposing surface and the adhesive surface, the distance from the opposing surface in a direction parallel to the first axis increasing toward the adhesive surface.

[0008] According to the above configuration, the presence of the inclined surface prevents adhesive present between the adhesive portion of the first metal terminal and the adhesive surface of the first flange from reaching the gap between the mounting portion of the first metal terminal and the opposing surface of the first flange. In other words, a gap can be reliably formed between the mounting portion of the first metal terminal and the opposing surface of the first flange. As a result, 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 elastic deformation of the mounting portion and the connecting portion. [Effects of the Invention]

[0009] Even if a difference in the degree of thermal deformation occurs between the coil component and the substrate or the like, the difference can be absorbed by the elastic deformation of the mounting portion and the connecting portion. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a coil component. [Figure 2] FIG. 2 is a plan view of the coil component. [Figure 3] 3 is a partially enlarged cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 4 is an enlarged perspective view of the first metal terminal and its vicinity. [Figure 5] FIG. 5 is a view of the first flange portion when viewed inward. [Figure 6] FIG. 6 is a view of the first metal terminal when viewed facing outward. [Figure 7] FIG. 7 is a diagram of the coil component when viewed in the first negative direction. [Figure 8] 8 is a partially enlarged cross-sectional view taken along line 8-8 in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of a coil component will be described. Note that the drawings may show components enlarged to facilitate understanding. The dimensional ratios of the components may differ from those in the actual product or from those shown 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 can be, for example, alumina, Ni-Zn ferrite, resin, or a mixture thereof.

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

[0015] Here, a specific axis perpendicular to the central axis C is referred to as the first axis X. In this embodiment, when viewed in a direction parallel to 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 the central axis C and the first axis X is referred to as the second axis Y. In this embodiment, an axis parallel to the central axis C is referred to as the third axis Z. One of the directions parallel to the first axis X is referred to as the first positive direction X1, and the direction opposite to the first positive direction X1 is referred to as the first negative direction X2. Similarly, one of the directions parallel to the second axis Y is referred to as the second positive direction Y1, and the direction opposite to the second positive direction Y1 is referred to as the second negative direction Y2. One of the directions parallel to the third axis Z is referred to as the third positive direction Z1, and the direction opposite to the third positive direction Z1 is referred to 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 a direction parallel to the first axis X and a direction parallel to the second axis Y. The first flange portion 20 has a symmetrical shape in the direction along the second axis Y.

[0017] The first flange portion 20 has a main body portion 21, a bottom surface-side protrusion 22, and an end surface-side protrusion 23. The main body portion 21 has a generally rectangular prism shape that is flattened in a direction parallel to the third axis Z. Here, among directions parallel to the central axis C, the direction from the first flange portion 20 toward the winding core portion 11 is defined as the inward direction, and the direction from the winding core portion 11 toward the first flange portion 20 is defined as the outward direction. As shown in FIG. 2, the outer surface of the main body portion 21 facing outward is defined as an outer end surface 21A, and the outer surface of the main body portion 21 facing inward is defined as an inner end surface 21B. Also, as shown in FIG. 1, the outer surface of the main body portion 21 facing in the first positive direction X1 is defined as a bottom surface 21C, and the outer surface of the main body portion 21 facing in the first negative direction X2 is defined as a top surface 21D. As shown in FIG. 2, the outer surface of the main body 21 facing the second positive direction Y1 is referred to as a first side surface 21E, and the outer surface of the main body 21 facing the second negative direction Y2 is referred to as a second side surface 21F.

[0018] 1, the winding core 11 is connected to the inner end surface 21B. That is, the outer end surface 21A is the surface of the main body 21 opposite to the surface connected to the winding core 11. The bottom surface protrusion 22 protrudes from the bottom surface 21C of the main body 21 in the first positive direction X1. The bottom surface protrusion 22 is located at the center of the main body 21 in a direction parallel to the second axis Y. The bottom surface protrusion 22 and the main body 21 are integrally molded. That is, there is no clear boundary between the bottom surface protrusion 22 and the main body 21. Details of the shape of the bottom surface protrusion 22 will be described later.

[0019] As shown in FIG. 2 , the end surface protrusion 23 protrudes outward from the outer end surface 21A of the main body 21. The end surface protrusion 23 is located at the center of the main body 21 in a direction parallel to the second axis Y. The end surface protrusion 23 extends across the entire main body 21 in a direction parallel to the first axis X. The end surface protrusion 23 also protrudes from the bottom surface protrusion 22. That is, the end surface protrusion 23 extends across a portion of the bottom surface protrusion 22 on the first negative direction X2 side in a direction parallel to the first axis X. The end surface protrusion 23, the main body 21, and the bottom surface protrusion 22 are integrally molded. That is, there is no clear boundary between the end surface protrusion 23 and the main body 21, or between the end surface protrusion 23 and the bottom surface protrusion 22. Details of the shape of the end surface protrusion 23 will be described later.

[0020] The second flange portion 30 has a symmetrical shape to the first flange portion 20 in a direction parallel to the third axis Z. That is, the second flange portion 30 protrudes outward relative to the winding core portion 11 in a direction parallel to the first axis X and a direction parallel to the second axis Y. The second flange portion 30 has a main body portion 31, a bottom surface side protrusion 32, and an end surface side protrusion 33.

[0021] Here, among directions parallel to the central axis C, the direction from the second flange 30 toward the winding core 11 is defined as the inward direction, and the direction from the winding core 11 toward the second flange 30 is defined as the outward direction. In other words, when the second flange 30 is used as the reference, the inward and outward directions are opposite to those when the first flange 20 is used as the reference.

[0022] 2, the surface of the main body 31 facing outward is referred to as outer end surface 31A, and the surface of the main body 31 facing inward is referred to as inner end surface 31B. Also, as shown in Fig. 1, the surface of the main body 31 facing the first positive direction X1 is referred to as bottom surface 31C, and the surface of the main body 31 facing the first negative direction X2 is referred to as top surface 31D. Also, as shown in Fig. 2, the surface of the main body 31 facing the second positive direction Y1 is referred to as first side surface 31E, and the surface of the main body 31 facing the second negative direction Y2 is referred to as second side surface 31F.

[0023] The bottom surface protrusion 32 protrudes in the first positive direction X1 from the bottom surface 31C of the main body 31. The shape and arrangement of the bottom surface protrusion 32 in the second flange 30 are the same as the shape and arrangement of the bottom surface protrusion 22 in the first flange 20.

[0024] The end face side protrusions 33 protrude outward from the outer end face 31A of the main body 31. The shape and arrangement of the end face side protrusions 33 in the second flange 30 are the same as the shape and arrangement of the end face side protrusions 23 in the first flange 20.

[0025] In this embodiment, the maximum dimension of the drum core 10C in a direction parallel to the first axis X is 2.3 mm, the maximum dimension of the drum core 10C in a direction parallel to the second axis Y is 2.6 mm, and the maximum dimension of the drum core 10C in a direction parallel to the third axis Z is 3.5 mm.

[0026] As shown in FIG. 1, the top plate 12 is a rectangular plate. The top plate 12 is flat in a direction parallel to the first axis X. The long sides of the top plate 12 are parallel to the third axis Z. The short sides of the top plate 12 are parallel to the second axis Y. The top plate 12 is located on the first negative direction X2 side of 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 20 and the top surface 31D of the main body 31 of the second flange 30. In other words, the top plate 12 spans between the first flange 20 and the second flange 30. The top plate 12 is made of the same non-conductive material as the drum core 10C.

[0027] 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 end face side protrusion 23. 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 end face side protrusion 23. 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 end face side protrusion 33. 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 end face side protrusion 33. The shapes of the first to fourth metal terminals 41 to 44 will be described in detail later.

[0028] As shown in Fig. 2, the coil device 10 includes a first wire 51 and a second wire 52. Although not shown, 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.

[0029] A 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 ridgeline 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. The first wire 51 extends from the ridgeline 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 near the second flange 30. A second wire end of the first wire 51 is joined to the third metal terminal 43 by thermocompression bonding.

[0030] 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. A 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 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. The second wire 52 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 near the second flange 30. A second wire end of the second wire 52 is joined to the fourth metal terminal 44 by thermocompression bonding.

[0031] <About the protrusion on the bottom side> The following description will be given representatively of bottom surface protrusion 22 of first flange 20. Bottom surface protrusion 32 of second flange 30 has a symmetrical shape in a direction parallel to third axis Z with respect to bottom surface protrusion 22 of first flange 20. Bottom surface protrusion 22 is a second protrusion that protrudes in first positive direction X1 from bottom surface 21C, which is the surface of first flange 20 facing the first positive direction X1.

[0032] As described above, the bottom surface protrusion 22 protrudes in the first positive direction X1 from the bottom surface 21C of the main body 21. The bottom surface protrusion 22 is located approximately in the center of the main body 21 in a direction parallel to the second axis Y.

[0033] 1, the bottom surface protrusion 22 is generally rectangular prism-shaped. The edges of the bottom surface protrusion 22 on the protruding tip side, on the second positive direction Y1 side, the second negative direction Y2 side, and the third positive direction Z1 side, are C-chamfered. As a result, the bottom surface protrusion 22 has a shape in which a tip portion in the shape of a truncated quadrangular pyramid protrudes from a base end portion of the rectangular prism-shaped base.

[0034] 2 and 3, the bottom surface protrusion 22 has an inner end surface 22A, an opposing surface 22B, a first inclined surface 22C, and an outer end surface 22D. The bottom surface protrusion 22 also 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.

[0035] 3, the inner end surface 22A is a surface of the bottom surface-side protrusion 22 facing the third negative direction Z2. Therefore, the inner end surface 22A is perpendicular to the third axis Z. The inner end surface 22A is flush with the inner end surface 21B of the main body 21.

[0036] The facing surface 22B is the surface of the bottom surface-side protrusion 22 facing the first positive direction X1. In other words, the facing surface 22B is the top surface of the bottom surface-side protrusion 22. The facing surface 22B is located closest to the first positive direction X1 of the first flange portion 20. The facing surface 22B is adjacent to the inner end surface 22A on the first positive direction X1 side. The facing surface 22B is perpendicular to the first axis X. The facing surface 22B faces a mounting portion 430 of a first metal terminal 41, which will be described later.

[0037] The first inclined surface 22C is a surface of the bottom surface-side protrusion 22 facing the third positive direction Z1 and the first positive direction X1. The first inclined surface 22C is adjacent to the opposing surface 22B on the third positive direction Z1 side. In the present embodiment, the first inclined surface 22C is flat. The distance of the first inclined surface 22C from the opposing surface 22B in the direction parallel to the first axis X increases as the first inclined surface 22C moves toward the third positive direction Z1 side.

[0038] In this embodiment, the inclination angle of the first inclined surface 22C is approximately 45 degrees. The average inclination angle of the first inclined surface 22C is also approximately 45 degrees. The inclination angle here refers to the acute angle between an imaginary plane including the opposing surface 22B and an imaginary plane including the first inclined surface 22C. The average inclination angle here is defined as follows: The inclination angle of the first inclined surface 22C at the edge closest to the third positive direction Z1 with respect to an imaginary plane parallel to the opposing surface 22B is calculated. The inclination angle of the first inclined surface 22C at the edge closest to the third negative direction Z2 with respect to an imaginary plane parallel to the opposing surface 22B is calculated. The inclination angle of the first inclined surface 22C at the center in the direction along the third axis Z with respect to an imaginary plane parallel to the opposing surface 22B is calculated. The average of these three inclination angles is defined as the average inclination angle. In the following description, the inclination angle and the average inclination angle will be calculated in the same manner.

[0039] The first flat surface 22F is adjacent to the first inclined surface 22C on the third positive direction Z1 side. The first flat surface 22F is planar. In this 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.

[0040] The chamfered surface 22H is adjacent to the first flat surface 22F on the third positive direction Z1 side. In this embodiment, the chamfered surface 22H is a curved surface that is convex toward the third positive direction Z1 side and the first positive direction X1 side. The average inclination angle of the chamfered surface 22H is approximately 45 degrees. In other words, the average inclination angle of the chamfered surface 22H is larger than the inclination angle of the first flat surface 22F.

[0041] 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 a surface of the bottom surface-side protrusion 22 facing the third positive direction Z1. Therefore, the outer end surface 22D is perpendicular to the third axis Z. The outer end surface 22D is flush with the outer end surface 21A of the main body 21. The outer end surface 22D, together with the outer end surface 21A of the main body 21, forms an adhesive surface AS to which an adhesive portion 410 of the first metal terminal 41 (described later) is adhered.

[0042] 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 second positive direction Y1 side with respect to the opposing surface 22B. The second inclined surface 22E, second flat surface 22G, and side end surface 22I on the second positive direction Y1 side will be described below.

[0043] The second inclined surface 22E is a surface facing the second positive direction Y1 and the first positive direction X1. The second inclined surface 22E is adjacent to the opposing surface 22B on the third negative direction Z2 side. The second inclined surface 22E is adjacent to the first inclined surface 22C on the second positive direction Y1 side. In this embodiment, the second inclined surface 22E is planar. The distance of the second inclined surface 22E from the opposing surface 22B in a 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. The average inclination angle of the second inclined surface 22E is also approximately 45 degrees.

[0044] The second flat surface 22G is adjacent to the second inclined surface 22E on the second positive direction Y1 side, i.e., on the opposite side to the opposing surface 22B. The second flat surface 22G is continuous with the first flat surface 22F. The second flat surface 22G is planar. In this 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.

[0045] The side end surface 22I is adjacent to the second flat surface 22G on the side in the first negative direction X2. The side end surface 22I is a surface of the bottom surface-side protrusion 22 facing the second positive direction Y1. Therefore, the side end surface 22I is perpendicular to the second axis Y. The side end surface 22I is connected to the bottom surface 21C of the main body 21.

[0046] The other of the two second inclined surfaces 22E, the other of the two second flat surfaces 22G, and the other 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 are symmetrical in the direction along the second axis Y to 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.

[0047] <Regarding the protrusion on the end face> The following description will be given representatively of the end face-side protrusion 23 of the first flange portion 20. 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 to the end face-side protrusion 23 of the first flange portion 20. The end face-side protrusion 23 is a first protrusion that protrudes from the outer end face 21A of the main body portion 21 opposite the surface that is connected to the winding core portion 11.

[0048] As described above, the end surface-side protrusion 23 protrudes outward from the outer end surface 21A of the main body portion 21. As shown in FIG. 5 , the end surface-side protrusion 23 extends across the entire main body portion 21 and a portion of the bottom surface-side protrusion 22 on the first negative direction X2 side in a direction parallel to the first axis X. Specifically, the end surface-side protrusion 23 extends from the end of the main body portion 21 on the first negative direction X2 side to the first flat surface 22F of the bottom surface-side protrusion 22. That is, the opposing surface 22B of the bottom surface-side protrusion 22 is located on the first positive direction X1 side relative to a portion of the end surface-side protrusion 23 located furthest to the first positive direction X1 side. The end surface-side protrusion 23 is located approximately in the center of the main body portion 21 in a direction along the second axis Y. The dimension of the end surface-side protrusion 23 in a direction parallel to the second axis Y is smaller than the maximum dimension of the bottom surface-side protrusion 22 in a direction parallel to the second axis Y. In addition, the top plate 12 is not shown in FIG.

[0049] 8, the boundary portion 23A between the end face-side protrusion 23 and the outer end surface 21A is chamfered. When viewed in the first negative direction X2, the boundary portion 23A between the end face-side protrusion 23 and the outer end surface 21A is a curved surface that is convex toward the center of the end face-side protrusion 23 and toward the third negative direction Z2. In other words, the chamfered shape is an R-chamfered shape.

[0050] <About the first metal terminal> As shown in FIG. 6 , the first metal terminal 41 has a plate shape. More specifically, the first metal terminal 41 has a plate shape that is 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 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. Specifically, the first metal terminal 41 is formed by bending a single plate material. Therefore, there is no clear boundary between these components inside the first metal terminal 41.

[0051] As shown in FIG. 5, the adhesive portion 410 has a substantially rectangular plate shape. 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 outward-facing surface of the outer surface of the first flange portion 20. As shown in FIG. 5, when viewed in the third negative direction Z2, the corners of the adhesive portion 410 on the second positive direction Y1 side and the first positive direction X1 side are rounded. On the other hand, the corners of the adhesive portion 410 on the second positive direction Y1 side and the first negative direction X2 side are substantially right angles. That is, the corner of the adhesive portion 410 located on the second positive direction Y1 side and closer to the top surface 21D has a larger curvature than the corner of the adhesive portion 410 located on the second positive direction Y1 side and closer to the bottom surface 21C.

[0052] 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 of the adhesive portion 410 on the first positive direction X1 side to the bottom surface 21C of the main body portion 21 is shorter than the shortest distance from the edge of the adhesive portion 410 on the first negative direction X2 side to the top surface 21D of the main body portion 21.

[0053] The maximum dimension of the adhesive portion 410 in the direction parallel to the second axis Y is half or less of the maximum dimension of the first flange portion 20 in the direction parallel to the second axis Y. In this embodiment, the dimension of the adhesive portion 410 in the direction parallel to the second axis Y is half or less of the dimension of the main body portion 21 in the direction parallel to the second axis Y.

[0054] The connecting portion 420 is adjacent to the adhesive portion 410 on the first positive direction X1 side. Specifically, the connecting portion 420 extends in the first positive direction X1 from the end of the adhesive portion 410 in the second negative direction Y2. When viewed in the third negative direction Z2, the connecting portion 420 has a substantially rectangular shape. The dimension of the connecting portion 420 in the direction along the second axis Y is smaller than the dimension of the adhesive portion 410 in the direction along the second axis Y. The dimension of the connecting portion 420 in the direction along the second axis Y is substantially constant except for the boundary portion with the adhesive portion 410. Meanwhile, the edge of the connecting portion 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 adhesive portion 410 on the second negative direction Y2 side. The end of the connecting portion 420 on the first positive direction X1 side protrudes from the first flange portion 20 in the first positive direction X1 when viewed in a direction parallel to the third axis Z. In Fig. 5, the boundary between the connecting portion 420 and the adhesive portion 410 is indicated by a virtual dashed line.

[0055] 4, the portion of the connecting portion 420 that protrudes toward the first positive direction X1 relative to the first flange 20 is curved by approximately 90 degrees midway. The curved portion is rounded. The end of the connecting portion 420 opposite the adhesive portion 410 faces the third negative direction Z2.

[0056] 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. That is, the connecting portion 420 connects the mounting portion 430 and 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. That is, the main surface of the mounting portion 430 is perpendicular to the main surface of the portion of the connecting portion 420 that extends along the first axis X. The dimension of the mounting portion 430 in a direction parallel to the second axis Y is the same as the dimension of the connecting portion 420 in a direction parallel to the second axis Y. The edge of the mounting portion 430 on the second negative direction Y2 side is in the same straight line as the edge of the connecting portion 420 on the second negative direction Y2 side and extends parallel to the third axis Z.

[0057] The mounting portion 430 is the portion of the first metal terminal 41 that is located closest to the first positive direction X1. The mounting portion 430 is spaced apart in the first positive direction X1 from the opposing surface 22B of the first flange 20. That is, a gap exists between the mounting portion 430 and the first flange 20. The mounting portion 430 and the opposing surface 22B face each other. The mounting portion 430 faces the substrate when the coil component 10 is mounted on the substrate.

[0058] As shown in FIG. 3 , the shortest distance W1 from the mounting portion 430 to the first flange 20 in the direction parallel to the first axis X is greater than the smallest dimension W2 of the mounting portion 430 in the direction parallel to the first axis X. Furthermore, the shortest distance W1 from the mounting portion 430 to the first flange 20 in the direction parallel to the first axis X is greater than the smallest 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 smallest 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 this 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 refers to the plate thickness of the first metal terminal 41. More specifically, the thickness is the shortest distance from a specific point on the outer surface of the first metal terminal 41 to the outer surface opposite to the outer surface where the specific point is located. The thickness of the mounting portion 430 is approximately constant.

[0059] 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 generally obliquely from the mounting portion 430 toward the second positive direction Y1 side and the first negative direction X2 side. 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 generally constant.

[0060] The extending portion 440 has a first portion 441 and a second portion 442. The first portion 441 is a portion of the extending portion 440 on the mounting portion 430 side. The second portion 442 is a portion of the extending portion 440 on the side farther from the mounting portion 430. The first portion 441 is also located at a connection point with the mounting portion 430. The second portion 442 is also located at a connection point between the extending portion 440 and a joint portion 450 (described later). The thickness of the first portion 441 is approximately the same as the thickness of the mounting portion 430. On the other hand, the thickness of the second portion 442 is smaller than the thickness of the first portion 441. Therefore, the second portion 442 is a thin portion whose thickness is smaller than the thickness of the mounting portion 430.

[0061] The surface of the first portion 441 facing the first flange 20 is flush with the surface of the second portion 442 facing the first flange 20. On the other hand, the surface of the second portion 442 facing the second positive direction Y1 is located on the second negative direction Y2 side of the surface of the first portion 441 facing the second positive direction Y1.

[0062] The extending portion 440 extends in the second positive direction Y1 so as to approach the bottom surface 21C of the main body portion 21. A gap is generated between the extending portion 440 and the first flange portion 20 in a direction parallel to the second axis Y. Specifically, a gap is generated between the extending portion 440 and the bottom surface-side protrusion 22 in a direction parallel to the second axis Y.

[0063] The joint 450 is connected to the end of the extension 440 on the first negative direction X2 side. The joint 450 is generally plate-shaped. The joint 450 includes a plate 451 and a joint protrusion 452. When viewed in a direction along the first axis X, the plate 451 has a generally rectangular shape elongated in the direction of the third axis Z. The maximum dimension of the plate 451 in a direction parallel to the third axis Z is larger than the maximum dimension of the extension 440 in a direction parallel to the third axis Z. A portion of the surface of the plate 451 facing the first positive direction X1, on the third negative direction Z2 side, is inclined. That is, the thickness of the portion of the plate 451 on the third negative direction Z2 side becomes smaller as it approaches the third negative direction Z2 side. The thickness of the portion of the plate 451 on which the inclined surface is not formed is generally the same as the thickness of the second portion 442.

[0064] 4, the plate 451 faces the bottom surface 21C of the main body 21 of the first flange 20 from the first positive direction X1 side. The surface of the joint 450 facing the first negative direction X2 is in contact with the bottom surface 21C. On the other hand, the surface of the plate 451 facing the first negative direction X2 is not fixed to the bottom surface 21C.

[0065] As shown in FIG. 7 , the joint protrusion 452 protrudes in the first positive direction X1 from a surface of the plate body 451 facing the first positive direction X1. The dimension of the joint protrusion 452 in a direction parallel to the third axis Z decreases toward the first positive direction X1. The dimension of the joint protrusion 452 in a direction parallel to the second axis Y decreases toward the first positive direction X1. That is, the joint protrusion 452 has a generally truncated quadrangular pyramid shape. When viewed in the first negative direction X2, the geometric center G2 of the joint protrusion 452 is located outward from the geometric center G1 of the joint portion 450 and on the opposite side from the extending portion 440. Specifically, the joint protrusion 452 protrudes from a corner of the plate body 451 facing the second positive direction Y1 and the third positive direction Z1. 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.

[0066] <Regarding the third negative side surface of the first metal terminal> As shown in FIG. 6, the first metal terminal 41 has a recess 401. As shown in FIG. 3, the recess 401 is recessed relative to the surface of the adhesive portion 410 facing the third negative direction Z2. The recess 401 is also recessed relative to the surface of the connecting portion 420 facing the third negative direction Z2. That is, as shown in FIG. 6, the recess 401 spans both the adhesive portion 410 and the connecting portion 420. The recess 401 extends over the entire area of ​​the adhesive portion 410 in a direction parallel to the second axis Y. As shown in FIG. 3, the end of the recess 401 on the first positive direction X1 side is located on the first negative direction X2 side with respect to the end of the adhesive surface AS on the first positive direction X1 side. As shown in FIG. 6, the end of the recess 401 on the first negative direction X2 side is located on the first positive direction X1 side with respect to the end of the adhesive portion 410 on the first negative direction X2 side. The recess 401 contains an adhesive 60. The adhesive 60 may overflow from the recess 401.

[0067] As shown in FIG. 6 , the first metal terminal 41 has a central edge 402, which is an edge on the second negative direction Y2 side and closer to the first flange 20, that is chamfered. Specifically, the edge on the second negative direction Y2 side of the surface of the first metal terminal 41 facing the first flange 20 is chamfered except for the recess 401. The central edge 402 has a shape in which the corners are cut off at an angle. That is, the central edge 402 is so-called C-chamfered. Here, the chamfer dimension is defined as follows: In the case of a C-chamfer, the chamfer dimension is 1 / √2 times the dimension of the chamfered oblique side. In the case of an R-chamfer, the chamfer dimension is the radius of the chamfered shape.

[0068] <Regarding the second to fourth metal terminals> 1, the second metal terminal 42 has a shape that is inverted relative to the first metal terminal 41 in the direction along the second axis Y. 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. In other words, the second metal terminal 42 to the fourth metal terminal 44 have the same configurations as the adhesive portion 410, the connecting portion 420, the mounting portion 430, the extending portion 440, and the bonding portion 450 described above.

[0069] <Regarding the positional relationship between the first metal terminal and the end face side protrusion> As described above, a gap is generated between the extending portion 440 and the first flange portion 20 in the direction parallel to the second axis Y. Specifically, a gap is generated between the extending portion 440 and the bottom surface side protrusion 22. Furthermore, a gap is generated between the joining portion 450 and the first flange portion 20 in the direction parallel to the second axis Y. Specifically, a gap is generated between the joining portion 450 and the bottom surface side protrusion 22.

[0070] As shown in FIG. 5, when viewed in the third negative direction Z2, the edge of the first metal terminal 41 on the second negative direction Y2 side is in surface contact with the end face-side protrusion 23. Specifically, as shown in FIG. 8, the surface of the end face-side protrusion 23 on the second positive direction Y1 side is in contact with the surface of the first metal terminal 41 on the second negative direction Y2 side. As described above, the first metal terminal 41 has a central edge 402. The chamfer dimension of the central edge 402 is larger than the chamfer dimension of the boundary portion 23A between the end face-side protrusion 23 and the outer end surface 21A. Therefore, the central edge 402 of the first metal terminal 41 is not in contact with the boundary portion 23A of the end face-side protrusion 23.

[0071] In addition, the shortest distance in the direction parallel to the second axis Y of the first metal terminal 41 from the end of the end surface-side protrusion 23 on the second positive direction Y1 side to the joint portion 450 is defined as a first distance P1. In addition, the longest distance in the direction parallel to the second axis Y from the end of the end surface-side protrusion 23 on the second positive direction Y1 side to the end of the bottom surface-side protrusion 22 on the second positive direction Y1 side, i.e., the side end surface 22I, is defined as a second distance P2. The first distance P1 is greater than the second distance P2.

[0072] Here, the shortest distance from the end of the end-face-side protrusion 23 on the second positive direction Y1 side to the extension 440 of the first metal terminal 41 in the direction parallel to the second axis Y is defined as a third distance P3. The third distance P3 is greater than the second distance P2.

[0073] The positional relationship between the second metal terminal 42 and the end face side protrusion 23 is the same as the positional relationship between the first metal terminal 41 and the end face side protrusion 23. The positional relationship between the third metal terminal 43 and the end face side protrusion 33 and the positional relationship between the fourth metal terminal 44 and the end face side protrusion 33 are also the same as the positional relationship between the first metal terminal 41 and the end face side protrusion 23.

[0074] Also, as shown in Figure 8, when viewed in the first negative direction X2, the outermost portion of the adhesive portion 410 of the first metal terminal 41 is located outward relative to the outermost portion of the end face side protrusion 23.

[0075] <About adhesives> 3, the recess 401 contains adhesive 60. Due to capillary action, the adhesive 60 may flow along the connecting portion 420, overflow from the recess 401, and flow toward the first positive direction X1. The adhesive 60 overflowing from the recess 401 may reach the chamfered surface 22H.

[0076] Here, multiple coil components 10 having different dimensions in the direction parallel to the central axis C from the inward end of first inclined surface 22C to adhesive surface AS were prepared, and it was confirmed whether adhesive 60 reached opposing surface 22B. As a result, when the smallest dimension MS in the direction parallel to the central axis C from the inward end of first inclined surface 22C to adhesive surface AS was 100 μm or more, adhesive 60 did not reach opposing surface 22B in all of the coil components.

[0077] <Effects of this embodiment> In the following, effects common to the first metal terminal 41 to the fourth metal terminal 44 will be described representatively only for the first metal terminal 41. Furthermore, effects common to the first flange portion 20 and the second flange portion 30 will be described only for the first flange portion 20.

[0078] (1) In the above embodiment, the first inclined surface 22C is present between the opposing surface 22B and the bonding surface AS. The distance of the first inclined surface 22C from the opposing surface 22B in the direction parallel to the first axis X increases toward the bonding surface AS. With this configuration, the presence of the first inclined surface 22C prevents the adhesive 60 present between the bonding portion 410 of the first metal terminal 41 and the bonding surface AS of the first flange 20 from reaching between the mounting portion 430 of the first metal terminal 41 and the opposing surface 22B of the first flange 20. In other words, a gap can be reliably formed between the mounting portion 430 of the first metal terminal 41 and the opposing surface 22B of the first flange 20. As a result, even if a difference in the degree of thermal deformation occurs between the coil component 10 and the substrate or the like when 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 and the connecting portion 420.

[0079] (2) In the above embodiment, the adhesive portion 410 is adhered to the outward-facing surface of the outer surface of the first flange portion 20. Specifically, the adhesive portion 410 is adhered to an adhesive surface AS including the outer end surface 21A of the first flange portion 20. With this configuration, the outer end surface 21A and the opposing surface 22B are perpendicular to each other, and therefore the adhesive 60 is unlikely to reach between the opposing surface 22B and the mounting portion 430.

[0080] (3) In the above embodiment, the first flange 20 has a first flat surface 22F between the adhesive surface AS and the first inclined surface 22C. The presence of this first flat surface 22F causes the first inclined surface 22C and the opposing surface 22B to move inward from the adhesive surface AS. This more effectively prevents the adhesive 60 from reaching the opposing surface 22B. Furthermore, compared to a configuration having only the first inclined surface 22C, the above configuration can prevent the first inclined surface 22C and the like from losing their shape when, for example, forming the drum core 10C using a mold or the like.

[0081] (4) In the above embodiment, the first flange portion 20 has a chamfered surface 22H between the adhesive surface AS and the first flat surface 22F. The average inclination angle of the chamfered surface 22H is larger than the inclination angle of the first flat surface 22F. This allows the adhesive 60 to accumulate in the space between the chamfered surface 22H and the adhesive surface AS. Therefore, even if the adhesive 60 spills out from the recess 401 in the first positive direction X1 due to capillary action, the adhesive 60 remains in the space between the chamfered surface 22H and the adhesive surface AS and is unlikely to reach the opposing surface 22B.

[0082] (5) In the above embodiment, the shortest distance W1 from the mounting portion 430 to the opposing surface 22B of the first flange 20 in the direction parallel to the first axis X is greater than the smallest dimension W2 of the mounting portion 430 in the direction along the first axis X. With this configuration, the mounting portion 430 is appropriately spaced apart from the opposing surface 22B of the first flange 20. Therefore, it is possible to prevent the adhesive 60 from bonding the mounting portion 430 and the opposing surface 22B.

[0083] (6) In the above embodiment, the shortest distance W1 from the mounting portion 430 to the opposing surface 22B in the direction parallel to the first axis X is greater than the smallest dimension MS from the inner end of the first inclined surface 22C to the adhesive surface AS in the direction parallel to the central axis C. With this configuration, the mounting portion 430 is appropriately spaced apart from the opposing surface 22B of the first flange 20. This prevents the adhesive 60 from bonding the mounting portion 430 to the opposing surface 22B.

[0084] (7) In the above embodiment, the minimum dimension MS from the inner end of the first inclined surface 22C to the adhesive surface AS in the direction parallel to the central axis C is approximately 200 μm. As described above, if the minimum dimension MS is 100 μm or more, the adhesive 60 is unlikely to reach the opposing surface 22B. Therefore, the mounting portion 430 and the opposing surface 22B are unlikely to be adhered to each other.

[0085] (8) In the above embodiment, the first flange 20 has the second inclined surface 22E. The second inclined surface 22E is inclined such that the distance from the opposing surface 22B in the direction parallel to the first axis X increases the farther the second inclined surface 22E is from the opposing surface 22B. Therefore, the adhesive 60 is less likely to flow around the bottom surface-side protrusion 22 in the direction along the second axis Y and reach the mounting portion 430.

[0086] (9) In the above embodiment, the first flange portion 20 has the second flat surface 22G. The inclination angle of the second flat surface 22G is smaller than the average inclination angle of the second inclined surface 22E. This provides the same effect as (3) in the direction parallel to the second axis Y.

[0087] <Example of change> This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be implemented in combination with each other as long as there is no technical contradiction. Note that, for 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. Furthermore, for modifications common to the first flange portion 20 and the second flange portion 30, only the first flange portion 20 will be described.

[0088] The configuration of the coil component 10 is not limited to the above embodiment. For example, the top plate 12 of the coil component 10 may be omitted. The shape of the first flange portion 20 is not limited to the shape of the above embodiment. For example, the end face side protrusion 23 of the first flange portion 20 may be omitted.

[0089] 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.

[0090] In the above embodiment, the winding core 11 does not have to be 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 include the mounting portion 430, the connecting portion 420, and the adhesive portion 410.

[0091] 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.

[0092] In the above embodiment, the extension portion 440 does not have to be directly connected to the mounting portion 430. For example, the adhesive portion 410 may be located between the extension portion 440 and the mounting portion 430.

[0093] 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 smallest dimension W2 of the mounting portion 430 in the direction along the first axis X.

[0094] In the above embodiment, the bonding portion 450 may be spaced apart from the bottom surface 21C. Also, the adhesive 60 may be disposed between the bonding portion 450 and the bottom surface 21C. In the above embodiment, the inclination angle of the first flat surface 22F is not limited to the example of the above embodiment. However, to obtain the effect described in (3) above, it is preferable that the inclination angle of the first flat surface 22F is smaller than the average inclination angle of the first inclined surfaces 22C. Furthermore, the first flat surface 22F of the first flange portion 20 can be omitted.

[0095] 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. Furthermore, the chamfered surface 22H can be omitted from the first flange portion 20. If the chamfered surface 22H is omitted, the first flat surface 22F will be adjacent to the outer end surface 22D. If the first flat surface 22F and the chamfered surface 22H are omitted, the first inclined surface 22C will be adjacent to the outer end surface 22D.

[0096] In the above embodiment, the shortest distance W1 from the mounting portion 430 to the first flange portion 20 in a direction parallel to the first axis X may be smaller than the smallest dimension MS in a direction parallel to the central axis C from the inner end of the first inclined surface 22C to the outer end surface 21A.

[0097] 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, to obtain the effect described in (7) above, the minimum dimension MS is preferably 100 μm or more. Furthermore, to ensure the strength of the first flange portion 20, the minimum dimension MS is preferably 300 μm or less.

[0098] In the above embodiment, the first flange 20 may have 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, to obtain the effect described in (9) above, it is preferable that the inclination angle of the second flat surface 22G is smaller than the average inclination angle of the second inclined surface 22E. Furthermore, the second flat surface 22G can be omitted from the first flange portion 20. If the second flat surface 22G is omitted, the second inclined surface 22E will be adjacent to the side end surface 22I. Furthermore, if the second inclined surface 22E is omitted together with the second flat surface 22G, the opposing surface 22B will be adjacent to the side end surface 22I.

[0099] In the above embodiment, the first inclined surface 22C and the second inclined surface 22E do not have to be flat. For example, the first inclined surface 22C and the second inclined surface 22E may be curved. Furthermore, the first inclined surface 22C, the second inclined surface 22E, and the chamfered surface 22H may be subjected to barrel processing or the like to form curved surfaces with non-uniform curvatures.

[0100] In the above embodiment, the recess 401 of the first metal terminal 41 can be omitted. In the above embodiment, the extension portion 440 may be in contact with the bottom surface side protrusion 22. Also, the joint portion 450 may be in contact with the bottom surface side protrusion 22.

[0101] In the above embodiment, the shape of the second portion 442 is not important. For example, the surface of the second portion 442 facing the second positive direction Y1 may be flush with the surface of the first portion 441 facing the second positive direction Y1. In this case, the surface of the second portion 442 facing the first flange 20 may be recessed relative to the surface of the first portion 441 facing the first flange 20. Furthermore, the second portion 442 does not have to have a surface that is flush with the first portion 441.

[0102] In the above embodiment, the position of the thin-walled portion, i.e., the portion of the extending portion 440 that is smaller than the thickness dimension of the mounting portion 430, does not matter. For example, the thin-walled portion may be located at the center of the extending portion 440 in the extending direction, or at the connecting portion of the extending portion 440 with the mounting portion 430.

[0103] In the above embodiment, the extension portion 440 may omit the second portion 442. That is, the overall thickness of the extension portion 440 may be the same as that of the mounting portion 430, or may be greater than that of the mounting portion 430.

[0104] In the above embodiment, the first portion 441 may be omitted from the extending portion 440. That is, the thickness of the entire extending portion 440 may be smaller than the thickness of the mounting portion 430.

[0105] In the above embodiment, the position of the joint protrusion 452 is not limited to the example of the above embodiment. For example, the geometric center G1 of the joint protrusion 452 may be located inward of the geometric center G2 of the joint 450. Alternatively, the geometric center G1 of the joint protrusion 452 may be located closer to the extension portion 440 than the geometric center G2 of the joint 450. Alternatively, the geometric center G1 of the joint protrusion 452 may coincide with the geometric center G2 of the joint 450.

[0106] In the above embodiment, the shape of the joining protrusion 452 is not limited to the example in the above embodiment. For example, the joining protrusion 452 may be substantially cylindrical. In the above embodiment, the joint portion 450 does not necessarily have to include the joint protrusion 452.

[0107] In the above embodiment, the manner in which the first wire end of the first wire 51 is joined 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. The same applies to the second wire 52.

[0108] In the above embodiment, the boundary portion 23A between the end face-side protrusion 23 and the outer end face 21A of the main body 21 does not have to be chamfered. In other words, the boundary portion 23A may be linear rather than curved.

[0109] In the above embodiment, the chamfer dimension of the central edge 402 may be the same as or smaller than the chamfer dimension of the boundary portion 23A. In the above embodiment, the edge of the first metal terminal 41 on the second negative direction Y2 side and closer to the first flange portion 20 does not have to be chamfered.

[0110] In the above embodiment, the adhesive portion 410 may be in line contact with the end face protrusion 23 instead of in surface contact. Also, the adhesive portion 410 and the end face protrusion 23 may not be in contact with each other. In the above embodiment, in the direction parallel to the first axis X, the portion of the end face side protrusion 23 located furthest in the first positive direction X1 and the opposing surface 22B may be at the same position.

[0111] In the above embodiment, the outermost portion of the adhesive portion 410 may be located inward relative to the outermost portion of the end face protrusion 23. Furthermore, the outermost portion of the adhesive portion 410 and the outermost portion of the end face protrusion 23 may be located on the same plane.

[0112] The technical concepts that can be derived from the above-described embodiments and modifications will be described below. [1] A drum core having a columnar winding core, a first flange connected to a first end of the winding core in a direction parallel to the central axis, and a second flange connected to a second end of the winding core opposite to the first end, a first metal terminal attached to the first flange, and a wire wound around the winding core and having a first wire end joined to the first metal terminal, wherein a specific axis perpendicular to the central axis is defined as a first axis, and one of the directions parallel to the first axis is defined as a first positive direction, and the first flange protrudes outward from the winding core in the first positive direction, and the first metal terminal is attached to the first metal terminal. a first flange having an opposing surface facing the mounting portion and an adhesive surface to which the adhesive is adhered, and the first flange has an inclined surface between the opposing surface and the adhesive surface, the inclined surface being distanced from the opposing surface in a direction parallel to the first axis toward the adhesive surface.

[0113] [2] The coil component according to [1], wherein the adhesive portion is adhered to a surface of the outer surface of the first flange portion that faces the outward direction when the direction from the winding core portion toward the first flange portion among directions parallel to the central axis is defined as the outward direction.

[0114] [3] The coil component according to [1] or [2], wherein the first flange portion has a planar flat surface between the adhesive surface and the inclined surface, and the inclination angle of the flat surface relative to the opposing surface is smaller than the average inclination angle of the inclined surface relative to the opposing surface.

[0115] [4] The coil component according to [3], wherein the first flange portion has a chamfered surface between the adhesive surface and the flat surface, and the average inclination angle of the chamfered surface relative to the opposing surface is larger than the inclination angle of the flat surface relative to the opposing surface.

[0116] [5] A coil component according to any one of [1] to [4], wherein the shortest distance from the mounting portion to the first flange portion in a direction parallel to the first axis is greater than the smallest dimension of the mounting portion in a direction parallel to the first axis.

[0117] [6] A coil component according to any one of [1] to [5], wherein, when the direction from the first flange portion toward the winding core portion among the directions parallel to the central axis is defined as an inward direction, the shortest distance from the mounting portion to the first flange portion in the direction parallel to the first axis is greater than the smallest dimension in the direction parallel to the central axis from the inward end of the inclined surface to the adhesive surface.

[0118] [7] The coil component according to any one of [1] to [6], wherein, when the direction from the first flange portion toward the winding core portion among the directions parallel to the central axis is defined as an inward direction, the smallest dimension in the direction parallel to the central axis from the inward end of the inclined surface to the adhesive surface is 100 μm or more and 300 μm or less.

[0119] [8] A coil component according to any one of [1] to [7], wherein when the inclined surface is defined as a first inclined surface, the first flange portion has a second inclined surface adjacent to the opposing surface and the first inclined surface, and the second inclined surface is inclined so that the distance from the opposing surface in a direction parallel to the first axis increases as the second inclined surface moves away from the opposing surface.

[0120] [9] The coil component described in [8], wherein the first flange portion has a planar second flat surface adjacent to the second inclined surface on the opposite side of the opposing surface, and the inclination angle of the second flat surface relative to the opposing surface is smaller than the average inclination angle of the second inclined surface relative to the opposing surface. [Explanation of symbols]

[0121] AS…adhesive surface C…Central axis 10...Coil parts 10C...Drum core 11...Core 20...First flange 21...Main body 22B…Opposing surface 22C…1st slope 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, a first flange connected to a first end of the winding core in a direction parallel to a central axis of the winding core, and a second flange connected to a second end of the winding core opposite to the first end; a first metal terminal attached to the first flange; a wire wound around the winding core and having a first wire end joined to the first metal terminal; Equipped with a specific axis perpendicular to the central axis is defined as a first axis, and one of directions parallel to the first axis is defined as a first positive direction; 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 that is bonded to the first flange portion via an adhesive; a mounting portion of the first metal terminal that is located closest to the first positive direction side and that is spaced apart from the first flange portion in the first positive direction; a connecting portion connecting the adhesive portion and the mounting portion; It has the first flange portion has an opposing surface facing the mounting portion and an adhesive surface to which the adhesive portion is adhered, the first flange portion has an inclined surface between the opposing surface and the adhesive surface, the inclined surface being distanced from the opposing surface in a direction parallel to the first axis gradually increasing toward the adhesive surface, The shortest distance from the mounting portion to the first flange portion in a direction parallel to the first axis is smaller than the smallest dimension of the mounting portion in the direction parallel to the first axis. Coil parts.

2. a drum core having a columnar winding core, a first flange connected to a first end of the winding core in a direction parallel to a central axis of the winding core, and a second flange connected to a second end of the winding core opposite to the first end; a first metal terminal attached to the first flange; a wire wound around the winding core and having a first wire end joined to the first metal terminal; Equipped with a specific axis perpendicular to the central axis is defined as a first axis, and one of directions parallel to the first axis is defined as a first positive direction; 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 that is bonded to the first flange portion via an adhesive; a mounting portion of the first metal terminal that is located closest to the first positive direction side and that is spaced apart from the first flange portion in the first positive direction; a connecting portion connecting the adhesive portion and the mounting portion; It has the first flange portion has an opposing surface facing the mounting portion and an adhesive surface to which the adhesive portion is adhered, the first flange portion has an inclined surface between the opposing surface and the adhesive surface, the inclined surface being distanced from the opposing surface in a direction parallel to the first axis gradually increasing toward the adhesive surface, When a direction from the first flange portion toward the winding core portion among directions parallel to the central axis is defined as an inward direction, The shortest distance from the mounting portion to the first flange portion in a direction parallel to the first axis is smaller than the smallest dimension from the inner end of the inclined surface to the adhesive surface in a direction parallel to the central axis. Coil parts.

3. When a direction parallel to the central axis from the winding core portion toward the first flange portion is defined as an outward direction, The adhesive portion is adhered to the surface of the outer surface of the first flange portion that faces the outward direction. The coil component according to claim 1 or 2.

4. the first flange portion has a planar flat surface between the adhesive surface and the inclined surface, The inclination angle of the flat surface relative to the opposing surface is smaller than the average inclination angle of the inclined surface relative to the opposing surface. The coil component according to claim 1 or 2.

5. the first flange portion has a chamfered surface between the adhesive surface and the flat surface, The average inclination angle of the chamfered surface relative to the opposing surface is larger than the inclination angle of the flat surface relative to the opposing surface. The coil component according to claim 4 .

6. When a direction from the first flange portion toward the winding core portion among directions parallel to the central axis is defined as an inward direction, The minimum dimension from the inner end of the inclined surface to the adhesive surface in a direction parallel to the central axis is 100 μm or more and 300 μm or less. The coil component according to claim 1 or 2.

7. When the inclined surface is a first inclined surface, the first flange portion has a second inclined surface adjacent to the opposing surface and the first inclined surface, The second inclined surface is inclined such that the distance from the opposing surface increases in a direction parallel to the first axis as the second inclined surface becomes farther from the opposing surface. The coil component according to claim 1 or 2.

8. the first flange portion has a second flat surface adjacent to the second inclined surface on the opposite side to the opposing surface, The inclination angle of the second flat surface with respect to the opposing surface is smaller than the average inclination angle of the second inclined surface with respect to the opposing surface. The coil component according to claim 7 .

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