Coil component

Abstract

To provide a coil component that can ensure a certain spatial distance and creepage distance with a component of a heat dissipation destination.SOLUTION: A coil component 100 includes a coil component body 200 and a cover 400. An upper end 210 of the coil component body 200 is covered by the cover 400. The cover 400 includes an upper portion 410 and a side wall portion 442. At least a portion of the upper portion 410 is made of an insulating material. When the coil component 100 is viewed from above in the vertical direction, the upper end 210 of the coil component body 200 is hidden by the upper portion 410 of the cover 400 and cannot be seen. An upper surface 412 and a lower surface 414 of the upper portion 410 are insulated from each other. An inner circumferential surface 4421 and an outer circumferential surface 4422 of the side wall portion 442 are made of an insulating material. The side wall portion 442 extends downward in the vertical direction from an outer circumferential end 416 of the upper portion 410. The side wall portion 442 does not reach a lower end 220 of the coil component body 200.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a coil component that is mounted on a substrate when in use. [Background technology]

[0002] Patent Document 1 discloses this type of toroidal coil (coil component) 900. As shown in Fig. 15, the coil component 900 is mounted on a substrate 940 when in use. The coil component 900 is also thermally connected to an aluminum housing 950, which serves as a heat dissipation destination for heat generated from the coil component 900. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7228159 Summary of the Invention [Problem to be solved by the invention]

[0004] When a member thermally connected to the coil component is a conductor, as in the coil component 900 of Patent Document 1, insulation between the member to which heat is dissipated and the coil component is essential. In order to insulate the coil component from the member to which heat is dissipated, it is necessary to ensure a certain spatial distance and creepage distance between the coil component and the member to which heat is dissipated.

[0005] Therefore, an object of the present invention is to provide a coil component that can ensure a constant spatial distance and creepage distance between itself and a member to which heat is dissipated. [Means for solving the problem]

[0006] The present invention provides a first coil component, A coil component that is mounted on a substrate when in use, The coil component includes a coil component body and a cover, The coil component body includes a core and a coil, The coil is wound around the core, the coil component body has an upper end and a lower end in the up-down direction, the upper end of the coil component body is covered by the cover, the lower end of the coil component body is mounted on the substrate when the coil component is in use, The cover has a top portion and a side wall portion; At least a portion of the upper portion is made of an insulating material, the upper portion is located above the upper end of the coil component body in the up-down direction, When the coil component is viewed from above in the up-down direction, the upper end of the coil component body is hidden by the upper side portion and cannot be seen, The upper portion has an upper surface and a lower surface in the up-down direction, the upper surface and the lower surface of the upper portion are insulated from each other; an inner peripheral surface and an outer peripheral surface of the side wall portion are made of an insulating material, the side wall portion extends downward in the up-down direction from an outer peripheral edge of the upper portion, The side wall portion does not reach the lower end of the coil component body. Coil components are provided.

[0007] Furthermore, the present invention provides a first coil component as the second coil component, the coil component further includes a connecting member made of a thermally conductive material, the connecting member is interposed between the coil component body and the upper portion and thermally connects the coil component body and the upper portion, The thermal conductivity of at least a portion of the upper portion is higher than the thermal conductivity of the connecting member. Coil components are provided.

[0008] Furthermore, the present invention provides a third coil component as a second coil component, The upper portion is made of an insulating material having a higher thermal conductivity than the connecting member. Coil components are provided.

[0009] Furthermore, the present invention provides a fourth coil component, which is the third coil component, The upper portion and the side wall portion are made of the same material. Coil components are provided.

[0010] Furthermore, the present invention provides a fifth coil component, which is the third coil component, The cover includes an insulating member and a highly thermally conductive member, the insulating member has the side wall portion and a visor portion, the eaves portion extends inward from an upper end of the side wall portion in the vertical direction within a horizontal plane perpendicular to the vertical direction, the high thermal conductivity member has insulating properties, the thermal conductivity of the high thermal conductivity member is higher than the thermal conductivity of the connection member; The high thermal conductivity member is sandwiched between the eaves portion and the connecting member. Coil components are provided.

[0011] Furthermore, the present invention provides a sixth coil component, which is a second coil component, the upper portion includes an insulating portion and a metallic portion; the insulating portion is located above the connecting member in the up-down direction, The metal portion is located above the insulating portion in the up-down direction. Coil components are provided.

[0012] Furthermore, the present invention provides a seventh coil component, which is any one of the first to sixth coil components, The coil component body further includes a core case, The core is housed in the core case, The coil is wound on the core case, A recess is formed on the outer periphery of the core case, the recess is recessed inward in a horizontal plane perpendicular to the up-down direction, the recess faces the side wall in a direction perpendicular to the up-down direction, The recess is at least partially filled with an adhesive, and the core case is bonded to the side wall portion with the adhesive. Coil components are provided. [Effects of the Invention]

[0013] The coil component of the present invention is configured as follows: the coil component includes a coil component main body and a cover; the upper end of the coil component main body is covered by the cover; the cover has an upper portion and a side wall portion; at least a portion of the upper portion is made of an insulating material; when the coil component is viewed from above in the vertical direction, the upper end of the coil component main body is hidden by the upper portion of the cover and cannot be seen; the upper and lower surfaces of the upper portion are insulated; and the inner and outer circumferential surfaces of the side wall portion are made of an insulating material. As a result, when a component to which heat is dissipated is thermally connected to the upper surface of the upper portion of the coil component of the present invention and the coil component is used, a constant spatial distance and creepage distance are ensured between the component to which heat is dissipated and the coil component. In other words, the coil component of the present invention is capable of ensuring a constant spatial distance and creepage distance between the component to which heat is dissipated. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing a coil component according to a first embodiment of the present invention; [Figure 2] 2 is a partially cutaway side view showing the coil component of Fig. 1. In the figure, the coil component is mounted on a substrate indicated by the dotted line. [Figure 3] FIG. 3 is an enlarged view showing the area surrounded by dotted line A in FIG. 2. [Figure 4] 2 is another perspective view showing the coil component of FIG. 1. FIG. [Figure 5] 2 is a perspective view showing a coil component body included in the coil component of FIG. 1. FIG. [Figure 6] FIG. 6 is a top view showing the coil device body of FIG. 5. [Figure 7] 7 is a cross-sectional view showing the coil device body of FIG. 6 taken along line BB. [Figure 8] FIG. 2 is a perspective view showing a first modified example of the coil component of FIG. [Figure 9] 9 is a partially cutaway side view showing the coil component of Fig. 8. In the figure, the coil component is mounted on a substrate indicated by the dotted line. [Figure 10] 10 is an enlarged view showing the part surrounded by the dotted line C in FIG. 9. FIG. [Figure 11] 10 is a partially cutaway side view showing a second modified example of the coil component of FIG 1. In the figure, the coil component is mounted on a substrate indicated by a dotted line. [Figure 12] 12 is an enlarged view showing the part surrounded by the dotted line D in FIG. 11. [Figure 13] FIG. 10 is a perspective view showing a coil component according to a second embodiment of the present invention. [Figure 14] 14 is a perspective view showing a coil component body included in the coil component of FIG. 13. FIG. [Figure 15] FIG. 1 is a cross-sectional view showing the toroidal coil of Patent Document 1. DETAILED DESCRIPTION OF THE INVENTION

[0015] (First embodiment) Referring to Fig. 2, a coil component 100 according to a first embodiment of the present invention is mounted on a substrate 800 during use. The substrate 800 extends along a horizontal plane. The coil component 100 according to this embodiment is a line filter. However, the present invention is not limited to this, and the present invention can also be applied to coil components 100 other than line filters.

[0016] As shown in FIG. 2, the coil device 100 of this embodiment includes a coil device body 200 and a cover 400.

[0017] 5 and 7, the coil component body 200 of this embodiment includes a core 240 and two coils 260. However, the present invention is not limited to this, and the number of coils 260 may be one, or three or more. That is, it is sufficient for the coil component body 200 to include the core 240 and at least one coil 260.

[0018] 7, core 240 in this embodiment is made of a soft magnetic metal material such as ferrite or a nanocrystalline material. However, the present invention is not limited to this, and the material of core 240 is not particularly limited as long as core 240 has the necessary magnetic properties. With reference to FIGS. 6 and 7, core 240 is a toroidal core and has a circular ring shape centered on axis AX that is parallel to the up-down direction and perpendicular to the horizontal plane.

[0019] The horizontal plane in this embodiment is the XY plane, and the up-down direction in this embodiment is the Z direction. In this embodiment, up is the +Z direction, and down is the -Z direction. Terms such as horizontal plane and up-down direction do not indicate an absolute positional relationship with respect to the ground, but merely indicate a relative positional relationship when the plane on which substrate 800 extends is defined as the horizontal plane and the position of coil device 100 with respect to substrate 800 is defined as the up direction.

[0020] Referring to FIG. 5, each of the coils 260 of this embodiment is a magnet wire made of a round wire 260X coated with an insulator. More specifically, each of the coils 260 includes only one round conductive wire made of a metal such as copper or aluminum. The conductive wire is coated with an insulator. That is, the cross-sectional shape of the round wire 260X is circular. However, the present invention is not limited to this. For example, the coil 260 may be a magnet wire made of a rectangular wire coated with an insulator. Referring to FIGS. 5 and 7, the coil 260 is wound around the core 240. Each of the coils 260 has a coil portion 262.

[0021] 5 and 7, the coil portion 262 of the present embodiment is wound around the core 240. As shown in FIGS. 4 and 5, the coil portion 262 has an upper end 2622 and a lower end 2624 in the vertical direction. The upper end 2622 of the coil portion 262 is covered by the cover 400. As shown in FIG. 3, the upper end 2622 has an outer end 2623 in a direction perpendicular to the vertical direction.

[0022] As shown in FIGS. 5 and 7, the coil device body 200 of this embodiment has an upper end 210 and a lower end 220 in the up-down direction.

[0023] 3, the upper end 210 of the coil device body 200 is covered with a cover 400. The upper end 210 of the coil device body 200 is located above the upper end 2622 of the coil portion 262 of the coil 260 in the up-down direction.

[0024] 2 and 4 , the lower end 220 of the coil component body 200 is mounted on the substrate 800 when the coil component 100 is in use. More specifically, when the coil component 100 is in use, the lower end 220 of the coil component body 200 is mounted on the substrate 800 via a pedestal 750. Note that the present invention is not limited to this, and when the coil component 100 is in use, the lower end 220 of the coil component body 200 may be mounted directly on the substrate 800 without the pedestal 750.

[0025] 2, the cover 400 of this embodiment defines the upper end of the coil device 100 in the up-down direction. To achieve high cooling efficiency for the coil portion 262 that generates heat when current is applied to the coil 260, the thermal conductivity of the cover 400 is preferably 20 W / mK or higher. As shown in FIG. 3, the cover 400 has an upper portion 410 and a side wall portion 442.

[0026] With reference to FIG. 3 , the upper portion 410 of the present embodiment is made of an insulating material. Note that the present invention is not limited to this, and it is sufficient that at least a portion of the upper portion 410 is made of an insulating material. The upper portion 410 is located above the upper end 210 of the coil component main body 200 in the up-down direction. With reference to FIGS. 1 and 3 , when the coil component 100 is viewed from above in the up-down direction, the upper end 210 of the coil component main body 200 is hidden by the upper portion 410 and cannot be seen. That is, the upper portion 410 does not have an opening that allows the coil component main body 200 to be seen from above. In other words, the upper end 210 of the coil component main body 200 is completely covered by the upper portion 410. As a result, when the coil component 100 is used by thermally connecting a component that is a heat dissipation destination to an upper surface 412 of the upper portion 410 of the coil component 100, the necessary spatial distance and creepage distance are ensured between the component that is the heat dissipation destination and the coil component 100. 3, the creepage distance refers to the total length of a thick dashed line BL that starts at outer end 2623 of upper end 2622 of coil portion 262 of coil 260 and ends at outer end 4122 of upper surface 412 of upper side portion 410. Here, outer end 2623 is the point where the distance between upper end 2622 of coil portion 262 and lower surface 414 of upper side portion 410 is the shortest. Specifically, the creepage distance in this embodiment refers to the total length of the thick dashed line BL, which extends upward from the outer end 2623 to the lower surface 414 of the upper portion 410, then extends outward in a direction perpendicular to the vertical direction along the lower surface 414 to the inner surface 4421 of the side wall portion 442, extends downward along the inner surface 4421 to the lower end of the side wall portion 442, then extends outward in a direction perpendicular to the vertical direction along the lower end of the side wall portion 442 to the outer surface 4422 of the side wall portion 442, and finally extends upward along the outer surface 4422 to reach the outer end 4122.

[0027] As shown in FIG. 3, the upper portion 410 of this embodiment has an upper surface 412 and a lower surface 414 in the up-down direction.

[0028] As shown in Fig. 3, the upper surface 412 of this embodiment faces upward in the vertical direction. The upper surface 412 is a plane perpendicular to the vertical direction. The upper surface 412 is located above the lower surface 414 in the vertical direction. The upper surface 412 and the lower surface 414 of the upper side portion 410 are insulated from each other. The upper surface 412 has an outer end 4122 in the direction perpendicular to the vertical direction.

[0029] 3, lower surface 414 of this embodiment faces downward in the vertical direction. Lower surface 414 is a plane perpendicular to the vertical direction. Lower surface 414 is located below upper surface 412 in the vertical direction.

[0030] As shown in FIG. 3 , the side wall portion 442 of the present embodiment extends downward in the up-down direction from the outer peripheral edge 416 of the upper side portion 410. In the up-down direction, the lower end of the side wall portion 442 is located below the upper end 2622 of the coil portion 262 of the coil 260. With reference to FIGS. 2 and 3 , the side wall portion 442 covers a portion of the coil portion 262 of the coil 260. The side wall portion 442 covers the upper end 2622 of the coil portion 262 of the coil 260. As shown in FIG. 4 , the side wall portion 442 does not reach the lower end 220 of the coil device main body 200. The side wall portion 442 does not reach the lower end 2624 of the coil portion 262 of the coil 260. As shown in FIG. 2 , when the coil device 100 is viewed from a direction perpendicular to the up-down direction, a portion of the coil device main body 200 is visible. More specifically, when the coil device 100 is viewed in a direction perpendicular to the vertical direction, a portion of the coil portion 262 of the coil 260 is visible. As a result, the coil portion 262 of the coil 260 is not completely covered by the side wall portion 442, ensuring heat dissipation from the coil portion 262 in a direction perpendicular to the vertical direction. The present invention is not limited to this. As long as the side wall portion 442 does not reach the lower end 220 of the coil device main body 200, the coil portion 262 may be completely covered by the side wall portion 442 and not visible when the coil device 100 is viewed in a direction perpendicular to the vertical direction. In this embodiment, the upper portion 410 and the side wall portion 442 are made of the same material. This reduces the number of parts in the coil device 100 and facilitates assembly. In this embodiment, the upper portion 410 and the side wall portion 442 are made of ceramic.

[0031] 2 and 4, the side wall portion 442 has an annular cross section in a plane perpendicular to the up-down direction.

[0032] As shown in FIG. 3, the side wall portion 442 has an inner circumferential surface 4421 and an outer circumferential surface 4422 .

[0033] 3, inner circumferential surface 4421 and outer circumferential surface 4422 of side wall portion 442 in this embodiment are made of an insulating material. As a result, when coil device 100 is used by thermally connecting a member that is a heat dissipation destination to upper surface 412 of upper portion 410 of coil device 100, a long creepage distance can be ensured between the member that is the heat dissipation destination and coil device 100.

[0034] As described above, the coil component 100 of this embodiment is configured as follows: the coil component 100 includes a coil component main body 200 and a cover 400; the upper end 210 of the coil component main body 200 is covered by the cover 400; the cover 400 has an upper portion 410 and a side wall portion 442; at least a portion of the upper portion 410 is configured of an insulating material; when the coil component 100 is viewed from above in the vertical direction, the upper end 210 of the coil component main body 200 is hidden by the upper portion 410 of the cover 400 and cannot be seen; the upper surface 412 and the lower surface 414 of the upper portion 410 are insulated from each other; and the inner surface 4421 and the outer surface 4422 of the side wall portion 442 are configured of an insulating material. As a result, when coil component 100 of the present embodiment is used by thermally connecting a member that is a heat dissipation destination to upper surface 412 of upper portion 410 of coil component 100, a constant spatial distance and creepage distance are ensured between the member that is the heat dissipation destination and coil component 100. In other words, coil component 100 of the present embodiment is able to ensure a constant spatial distance and creepage distance between the member that is the heat dissipation destination.

[0035] As shown in FIG. 3, the coil device 100 further includes a connecting member 500 made of a thermally conductive material.

[0036] 3, the connection member 500 is located above the coil component main body 200 in the up-down direction. The connection member 500 is located below the upper-side portion 410 in the up-down direction. The connection member 500 is interposed between the coil component main body 200 and the upper-side portion 410, and thermally connects the coil component main body 200 and the upper-side portion 410. The connection member 500 is located between the upper end 2622 of the coil portion 262 of the coil 260 and the lower surface 414 of the upper-side portion 410 in the up-down direction. The connection member 500 is in contact with the upper end 2622 of the coil portion 262 of the coil 260. The connection member 500 is in contact with the lower surface 414 of the upper-side portion 410.

[0037] In the present embodiment, the thermal conductivity of upper portion 410 is higher than the thermal conductivity of connecting member 500. More specifically, upper portion 410 is made of an insulating material that has a higher thermal conductivity than connecting member 500. However, the present invention is not limited to this, and it is sufficient that the thermal conductivity of at least a part of upper portion 410 is higher than the thermal conductivity of connecting member 500.

[0038] The thermal conductivity of the connecting member 500 is preferably 2.0 W / mK or higher, and more preferably 3.0 W / mK or higher, in order to obtain high cooling efficiency for the coil portion 262 that generates heat when current is passed through the coil 260. The connecting member 500 of this embodiment has insulating properties in order to insulate the two coils 260 from each other. However, the present invention is not limited to this, and if the coil device 100 has only one coil 260, the connecting member 500 does not need to have insulating properties. Examples of materials for the connecting member 500 include electrically insulating epoxy resin, thermally conductive silicone, thermally conductive epoxy adhesive, and thermally conductive sheet.

[0039] As shown in FIG. 4, the coil device 100 further includes four terminal portions 264.

[0040] 4, the terminal portion 264 in this embodiment extends downward in the up-down direction from the coil portion 262. The terminal portion 264 defines the lower end of the coil device 100 in the up-down direction. The two terminal portions 264 are formed integrally with the coil portion 262. However, the present invention is not limited to this. For example, the terminal portion 264 may be a separate member from the coil portion 262 and may be welded to the coil portion 262.

[0041] As shown in FIG. 5, the coil device body 200 further includes a core case 600.

[0042] Referring to FIG. 5, the core case 600 of this embodiment is made of plastic such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET), or phenolic resin. However, the present invention is not limited to this, and the material of the core case 600 is not particularly limited as long as the core case 600 has the necessary insulating properties. As shown in FIG. 7, the core 240 is housed in the core case 600. As shown in FIG. 5, the coil 260 is wound on the core case 600. That is, each of the two coils 260 is wound on the core case 600. As shown in FIG. 4, the core case 600 has an outer periphery 610. A recess 612 is formed in the outer periphery 610 of the core case 600.

[0043] 4, recess 612 in this embodiment is recessed inward in a horizontal plane perpendicular to the up-down direction. Recess 612 faces side wall 442 in a direction perpendicular to the up-down direction. Adhesive 700 is at least partially filled in recess 612, and core case 600 is bonded to side wall 442 with adhesive 700.

[0044] As described above, in the coil component 100 of the present embodiment, the core case 600 of the coil component main body 200 is bonded to the side wall portion 442 of the cover 400 with the adhesive 700 filled in the recess 612 of the core case 600, but the present invention is not limited to this. As long as the core case 600 of the coil component main body 200 is reliably fixed to the side wall portion 442 of the cover 400, the core case 600 may be fixed to the side wall portion 442 by another fixing means such as a snap fit.

[0045] As shown in FIG. 5, the core case 600 has two coil-wound portions 620 and two partition portions 630.

[0046] As shown in FIG. 6, the coil wound portions 620 of this embodiment are aligned in a first predetermined direction perpendicular to the up-down direction. The two coil wound portions 620 are arranged in mirror symmetry with respect to a plane perpendicular to the first predetermined direction and passing through the center of the coil device main body 200 in the first predetermined direction. In this embodiment, the first predetermined direction is the Y direction. The coil portions 262 of the two coils 260 are wound around the two coil wound portions 620, respectively. With reference to FIGS. 6 and 7, each of the coil wound portions 620 is located between two partition portions 630 in the circumferential direction centered on the axis AX. As shown in FIG. 4, the side wall portion 442 covers a portion of the coil wound portion 620.

[0047] As shown in FIG. 6 , the partition portions 630 of this embodiment are aligned in a second predetermined direction that is perpendicular to both the vertical direction and the first predetermined direction. The two coil wound portions 620 are arranged in mirror symmetry with respect to a plane perpendicular to the second predetermined direction and passing through the center of the coil device main body 200 in the second predetermined direction. In this embodiment, the second predetermined direction is the X direction. Referring to FIGS. 6 and 7 , each partition portion 630 is located between the two coil wound portions 620 in the circumferential direction about the axis AX. As shown in FIG. 4 , the side wall portion 442 covers a portion of the partition portion 630. However, the present invention is not limited to this, and the side wall portion 442 does not necessarily have to cover the partition portion 630. As shown in FIGS. 4 and 5 , the partition portion 630 has an upper end 632 and a lower end 634 in the vertical direction.

[0048] As shown in FIG. 3 , in the coil component 100 of this embodiment, the upper end 632 of the partitioning portion 630 is located above the upper end 2622 of the coil portion 262 of the coil 260 in the up-down direction. In the coil component 100 of this embodiment, the upper end 210 of the coil component main body 200 is the upper end 632 of the partitioning portion 630. That is, in the coil component 100 of this embodiment, the upper end 632 of the partitioning portion 630 defines the upper end 210 of the coil component main body 200 in the up-down direction. Note that the present invention is not limited to this, and the upper end of the core case 600 may be located below the upper end 2622 of the coil portion 262 of the coil 260 in the up-down direction. In this case, the upper end 210 of the coil component main body 200 is the upper end 2622 of the coil portion 262 of the coil 260. That is, in this case, the upper end 2622 of the coil portion 262 defines the upper end 210 of the coil component main body 200 in the up-down direction.

[0049] As shown in FIG. 4 , in the coil component 100 of this embodiment, the lower end 634 of the partitioning portion 630 is located lower in the up-down direction than the lower end 2624 of the coil portion 262 of the coil 260. In the coil component 100 of this embodiment, the lower end 220 of the coil component main body 200 is the lower end 634 of the partitioning portion 630. That is, in the coil component 100 of this embodiment, the lower end 634 of the partitioning portion 630 defines the lower end 220 of the coil component main body 200 in the up-down direction. Note that the present invention is not limited to this, and the lower end of the core case 600 may be located higher in the up-down direction than the lower end 2624 of the coil portion 262 of the coil 260. In this case, the lower end 220 of the coil component main body 200 is the lower end 2624 of the coil portion 262. That is, in this case, the lower end 2624 of the coil portion 262 defines the lower end 220 of the coil component main body 200 in the up-down direction.

[0050] 2 and 4, the lower end 634 of the partitioning portion 630 is mounted on the substrate 800 when the coil device 100 is in use. More specifically, when the coil device 100 is in use, the lower end 634 of the partitioning portion 630 is mounted on the substrate 800 via the pedestal 750.

[0051] The coil component body 200 in the above-described embodiment includes the core case 600 having the partition portion 630, but the present invention is not limited to this and may include the core case 600 without the partition portion 630, or may not include the core case 600 at all. In this case, the upper end 210 of the coil component body 200 becomes the upper end 2622 of the coil portion 262 of the coil 260, and the lower end 220 of the coil component body 200 becomes the lower end 2624 of the coil portion 262 of the coil 260.

[0052] Up to this point, the first embodiment of the present invention has been described, but this embodiment may be modified as follows.

[0053] (First Modification) 8, a coil component 100A according to the first modified example includes a coil component body 200 and a cover 400A. The coil component body 200 of this modified example is the same as the coil component body 200 of the embodiment described above, and detailed description thereof will be omitted.

[0054] 8, the cover 400A of this modification defines the upper end of the coil device 100A in the up-down direction. The cover 400A has an upper side portion 410A and a side wall portion 442A.

[0055] Referring to FIG. 10 , the upper portion 410A of this modified example is made of an insulating material. Note that the present invention is not limited to this, and it is sufficient that at least a portion of the upper portion 410A is made of an insulating material. To achieve high cooling efficiency for the coil portion 262 that generates heat when current is applied to the coil 260, it is preferable that the thermal conductivity of at least a portion of the upper portion 410A be 20 W / mK or higher. The upper portion 410A is located above the upper end 210 of the coil component main body 200 in the vertical direction. Referring to FIGS. 8 and 9 , when the coil component 100A is viewed from above in the vertical direction, the upper end 210 of the coil component main body 200 is hidden by the upper portion 410A and cannot be seen. That is, the upper portion 410A does not have an opening that allows the coil component main body 200 to be seen from above. In other words, the upper end 210 of the coil component main body 200 is completely covered by the upper portion 410A. As a result, when the coil device 100A is used by thermally connecting a component to which heat is to be dissipated to the upper surface 412A of the upper portion 410A of the coil device 100A, the necessary spatial distance and creepage distance are ensured between the component to which heat is to be dissipated and the coil device 100A. Note that the creepage distance in this modification refers to the total length of the thick dashed line BLA shown in FIG. 10 , which starts at the outer end 2623 in a direction perpendicular to the up-down direction of the upper end 2622 of the coil portion 262 of the coil 260 and ends at the inner end 4443 of the upper surface 4442 of the eaves portion 444 (described later). Here, the outer end 2623 is the point where the distance between the upper end 2622 of the coil portion 262 and the lower surface 414A of the upper portion 410A is shortest. Specifically, the creepage distance in this modified example refers to the total length of the thick dashed line BLA, which extends upward from the outer end 2623 to the lower surface 414A of the upper portion 410A, then extends outward in a direction perpendicular to the vertical direction along the lower surface 414A to the inner surface 4421A of the side wall portion 442A, extends upward along the inner surface 4421A to the lower surface 4444 of the eaves portion 444, then extends inward in a direction perpendicular to the vertical direction along the lower surface 4444 to the inner surface of the eaves portion 444, and finally extends upward along the inner surface of the eaves portion 444 to reach the inner end 4443.

[0056] As shown in FIG. 10, the upper portion 410A of this modified example has, in the up-down direction, an upper surface 412A and a lower surface 414A.

[0057] 10, upper surface 412A of this modified example faces upward in the vertical direction. Upper surface 412A is located above lower surface 414A in the vertical direction. Upper surface 412A and lower surface 414A of upper side portion 410A are insulated from each other.

[0058] 10, lower surface 414A of this modified example faces downward in the vertical direction. Lower surface 414A is a plane perpendicular to the vertical direction. Lower surface 414A is located below upper surface 412A in the vertical direction.

[0059] As shown in FIG. 10 , the side wall portion 442A of this modified example extends downward in the up-down direction from the outer peripheral edge 416A of the upper side portion 410A. In the up-down direction, the lower end of the side wall portion 442A is located below the upper end 2622 of the coil portion 262 of the coil 260. The side wall portion 442A covers a portion of the coil portion 262 of the coil 260. The side wall portion 442A covers the upper end 2622 of the coil portion 262 of the coil 260. As shown in FIG. 9 , the side wall portion 442A does not reach the lower end 220 of the coil device main body 200. The side wall portion 442A does not reach the lower end 2624 of the coil portion 262 of the coil 260. Referring to FIG. 8 , when the coil device 100A is viewed from a direction perpendicular to the up-down direction, a portion of the coil device main body 200 is visible. More specifically, when coil device 100A is viewed in a direction perpendicular to the up-down direction, a portion of coil portion 262 of coil 260 is visible. As a result, coil portion 262 of coil 260 is not completely covered by side wall portion 442A, and heat dissipation from coil portion 262 in a direction perpendicular to the up-down direction is ensured. Note that the present invention is not limited to this, and as long as side wall portion 442A does not reach lower end 220 of coil device main body 200, coil portion 262 may be completely covered by side wall portion 442A and not be visible when coil device 100A is viewed in a direction perpendicular to the up-down direction.

[0060] 8 and 9, the side wall portion 442A has an annular cross section in a plane perpendicular to the up-down direction.

[0061] As shown in FIG. 10, the side wall portion 442A has an inner circumferential surface 4421A and an outer circumferential surface 4422A.

[0062] 10, inner circumferential surface 4421A and outer circumferential surface 4422A of side wall portion 442A of this modification are made of an insulating material. As a result, when coil device 100A is used by thermally connecting a member to which heat is to be dissipated to upper surface 412A of upper portion 410A of coil device 100A, a long creepage distance can be ensured between the member to which heat is to be dissipated and coil device 100A.

[0063] As shown in FIG. 8, a cover 400A of this modification includes an insulating member 440 and a highly heat-conductive member 470.

[0064] 10, insulating member 440 of this modification is made of plastic such as polyamide resin, PET resin, etc. Insulating member 440 has side wall portion 442A and eaves portion 444 described above.

[0065] As shown in FIG. 10 , the eaves portion 444 of this modified example extends inward from an upper end 4424A in the vertical direction of the side wall portion 442A in a horizontal plane perpendicular to the vertical direction. The eaves portion 444 is located above the high thermal conductivity member 470 in the vertical direction. The eaves portion 444 has an upper surface 4442 and a lower surface 4444. The upper surface 4442 faces upward in the vertical direction. The upper surface 4442 is a plane perpendicular to the vertical direction. The upper surface 4442 has an inner end 4443 in a direction perpendicular to the vertical direction. The lower surface 4444 faces downward in the vertical direction. The lower surface 4444 is a plane perpendicular to the vertical direction.

[0066] Referring to FIG. 10 , the high thermal conductivity member 470 of this modification has insulating properties. Specifically, the high thermal conductivity member 470 is made of ceramic. To achieve high cooling efficiency for the coil portion 262 that generates heat when current is applied to the coil 260, the thermal conductivity of the high thermal conductivity member 470 is preferably 20 W / mK or higher. The high thermal conductivity member 470 is located below the eaves portion 444 in the vertical direction. Referring to FIG. 8 , the high thermal conductivity member 470 has a circular shape when viewed alone in the vertical direction. When the coil device 100A is viewed from above, a portion of the high thermal conductivity member 470 is visible. The high thermal conductivity member 470 has an upper surface 472 and a lower surface 474 in the vertical direction. The upper surface 472 and the lower surface 474 are each flat and perpendicular to the vertical direction. The upper surface 472 faces upward in the vertical direction. The lower surface 474 faces downward in the vertical direction.

[0067] 10, eaves portion 444 and high thermal conductivity member 470 form upper portion 410A. An upper surface 4442 of eaves portion 444 and a part of an upper surface 472 of high thermal conductivity member 470 form upper surface 412A of upper portion 410A. A lower surface 474 of high thermal conductivity member 470 forms lower surface 414A of upper portion 410A.

[0068] As described above, cover 400A of this modification is made up of insulating member 440 made of plastic and highly thermally conductive member 470 made of ceramic. This allows cover 400A of this modification to be manufactured at a lower cost than when the entire cover is made up of ceramic.

[0069] As described above, the coil device 100A of this modified example is configured as follows: the coil device 100A includes a coil device main body 200 and a cover 400A; the upper end 210 of the coil device main body 200 is covered by the cover 400A; the cover 400A has an upper portion 410A and a side wall portion 442A; at least a portion of the upper portion 410A is configured from an insulating material; when the coil device 100A is viewed from above in the vertical direction, the upper end 210 of the coil device main body 200 is hidden by the upper portion 410A of the cover 400A and cannot be seen; there is insulation between the upper surface 412A and the lower surface 414A of the upper portion 410A; and the inner surface 4421A and the outer surface 4422A of the side wall portion 442A are configured from an insulating material. As a result, when coil device 100A of this modified example is used by thermally connecting a member that is a heat dissipation destination to upper surface 412A of upper portion 410A of coil device 100A, a constant spatial distance and creepage distance are ensured between the member that is the heat dissipation destination and coil device 100A. That is, with coil device 100A of this modified example, a constant spatial distance and creepage distance can also be ensured between coil device 100A and the member that is the heat dissipation destination.

[0070] As shown in FIG. 10, the coil device 100A further includes a connecting member 500 similar to the connecting member 500 of the above-described embodiment.

[0071] 10 , the connecting member 500 of the present embodiment is located below the upper portion 410A in the up-down direction. The connecting member 500 is interposed between the coil device main body 200 and the upper portion 410A, and thermally connects the coil device main body 200 and the upper portion 410A. The connecting member 500 is located between the upper end 2622 of the coil portion 262 of the coil 260 and the lower surface 414A of the upper portion 410A in the up-down direction. The connecting member 500 is in contact with the upper end 2622 of the coil portion 262 of the coil 260. The connecting member 500 is in contact with the lower surface 414A of the upper portion 410A.

[0072] 10 , the thermal conductivity of the high thermal conductivity member 470 is higher than that of the connecting member 500. The high thermal conductivity member 470 is sandwiched between the eaves portion 444 and the connecting member 500. The connecting member 500 is located below the high thermal conductivity member 470 in the up-down direction. The connecting member 500 is interposed between the coil component main body 200 and the high thermal conductivity member 470, and thermally connects the coil component main body 200 and the high thermal conductivity member 470. The connecting member 500 is located between the upper end 2622 of the coil portion 262 of the coil 260 and the lower surface 474 of the high thermal conductivity member 470 in the up-down direction.

[0073] (Second Modification) 11, a coil component 100B of the second modified example includes a coil component body 200 and a cover 400B. The coil component body 200 of this modified example is the same as the coil component body 200 of the embodiment described above, and detailed description thereof will be omitted.

[0074] 11, the cover 400B of this modification defines the upper end of the coil device 100B in the up-down direction. To achieve high cooling efficiency for the coil portion 262 that generates heat when current is applied to the coil 260, the thermal conductivity of the cover 400B is preferably 20 W / mK or higher. The cover 400B has an upper portion 410B and a side wall portion 442B.

[0075] Referring to FIG. 12 , the upper portion 410B of this modified example is made of an insulating material. Note that the present invention is not limited to this, and it is sufficient that at least a portion of the upper portion 410B is made of an insulating material. To achieve high cooling efficiency for the coil portion 262 that generates heat when current is applied to the coil 260, it is preferable that the thermal conductivity of at least a portion of the upper portion 410B be 20 W / mK or higher. The upper portion 410B is located above the upper end 210 of the coil component main body 200 in the vertical direction. When the coil component 100B is viewed from above in the vertical direction, the upper end 210 of the coil component main body 200 is hidden by the upper portion 410B and cannot be seen. That is, the upper portion 410B does not have an opening that allows the coil component main body 200 to be seen from above. In other words, the upper end 210 of the coil component main body 200 is completely covered by the upper portion 410B. As a result, when the coil device 100B is used by thermally connecting a component to which heat is to be dissipated to the upper surface 412B of the upper portion 410B, the necessary spatial distance and creepage distance are ensured between the component to which heat is to be dissipated and the coil device 100B. Note that the creepage distance in this modification refers to the total length of the thick dashed line BLB shown in FIG. 12 , which starts at the outer end 2623 in a direction perpendicular to the up-down direction of the upper end 2622 of the coil portion 262 of the coil 260 and ends at the inner end 4463 of the upper surface 4462 of the second eaves portion 446, which will be described later. Here, the outer end 2623 is the point where the distance between the upper end 2622 of the coil portion 262 and the lower surface 414B of the upper portion 410B is the shortest. Specifically, the creepage distance in this modified example refers to the total length of the thick dashed line BLB, which extends upward from the outer end 2623 to the lower surface 414B of the upper portion 410B, then extends outward in a direction perpendicular to the vertical direction along the lower surface 414B to the inner surface 4421B of the side wall portion 442B, extends upward along the inner surface 4421B to the lower surface 4464 of the second eaves portion 446, then extends inward in a direction perpendicular to the vertical direction along the lower surface 4464 to the inner surface of the second eaves portion 446, and finally extends upward along the inner surface of the second eaves portion 446 to reach the inner end 4463.

[0076] As shown in FIG. 12, the upper portion 410B of this modified example has, in the up-down direction, an upper surface 412B and a lower surface 414B.

[0077] 12, the upper surface 412B of this modified example faces upward in the vertical direction. The upper surface 412B is located above the lower surface 414B in the vertical direction. The upper surface 412B and the lower surface 414B of the upper side portion 410B are insulated from each other.

[0078] 12, the lower surface 414B of this modified example faces downward in the vertical direction. The lower surface 414B is a plane perpendicular to the vertical direction. The lower surface 414B is located below the upper surface 412B in the vertical direction.

[0079] As shown in FIG. 12, the upper portion 410B of this modified example includes an insulating portion 417 and a metal portion 418.

[0080] Referring to FIG. 12, insulating portion 417 of this modified example is made of flame-retardant polypropylene, a flame-retardant polycarbonate sheet, or the like. Insulating portion 417 has a flat plate shape perpendicular to the vertical direction. When viewed vertically, insulating portion 417 has a circular shape. Insulating portion 417 has an upper surface 4172 and a lower surface 4174 in the vertical direction. Each of upper surface 4172 and lower surface 4174 is a flat surface perpendicular to the vertical direction. Upper surface 4172 faces upward in the vertical direction. Lower surface 4174 faces downward in the vertical direction.

[0081] Referring to FIG. 12 , the metal part 418 of this modification is a flat metal plate perpendicular to the vertical direction. When the metal part 418 is viewed alone in the vertical direction, it has a circular shape. The metal part 418 is located above the insulating part 417 in the vertical direction. The metal part 418 has an upper surface 4182 and a lower surface 4184 in the vertical direction. The upper surface 4182 and the lower surface 4184 are each flat surfaces perpendicular to the vertical direction. The upper surface 4182 faces upward in the vertical direction. The lower surface 4184 faces downward in the vertical direction. A space 419 is present between the upper surface 4172 of the insulating part 417 and the lower surface 4184 of the metal part 418.

[0082] As shown in FIG. 12 , the side wall portion 442B of this modified example extends downward in the up-down direction from the outer peripheral edge 416B of the upper side portion 410B. In the up-down direction, the lower end of the side wall portion 442B is located below the upper end 2622 of the coil portion 262 of the coil 260. The side wall portion 442B covers a portion of the coil portion 262 of the coil 260. The side wall portion 442B covers the upper end 2622 of the coil portion 262 of the coil 260. As shown in FIG. 11 , the side wall portion 442B does not reach the lower end 220 of the coil device main body 200. The side wall portion 442B does not reach the lower end 2624 of the coil portion 262 of the coil 260. When the coil device 100B is viewed from a direction perpendicular to the up-down direction, a portion of the coil device main body 200 is visible. More specifically, when coil device 100B is viewed in a direction perpendicular to the up-down direction, a portion of coil portion 262 of coil 260 is visible. As a result, coil portion 262 of coil 260 is not completely covered by side wall portion 442B, and heat dissipation from coil portion 262 in a direction perpendicular to the up-down direction is ensured. Note that the present invention is not limited to this, and as long as side wall portion 442B does not reach lower end 220 of coil device main body 200, coil portion 262 may be completely covered by side wall portion 442B and not be visible when coil device 100B is viewed in a direction perpendicular to the up-down direction.

[0083] Referring to FIG. 11, the side wall portion 442B has an annular cross section in a plane perpendicular to the up-down direction.

[0084] As shown in FIG. 12, the side wall portion 442B has an inner circumferential surface 4421B and an outer circumferential surface 4422B.

[0085] 12, inner circumferential surface 4421B and outer circumferential surface 4422B of side wall portion 442B in this modification are made of an insulating material. As a result, when coil device 100B is used by thermally connecting a member to which heat is to be dissipated to upper surface 412B of upper portion 410B of coil device 100B, a long creepage distance can be ensured between the member to which heat is to be dissipated and coil device 100B.

[0086] As described above, the coil device 100B of this modified example is configured as follows: the coil device 100B includes a coil device main body 200 and a cover 400B; the upper end 210 of the coil device main body 200 is covered by the cover 400B; the cover 400B has an upper portion 410B and a side wall portion 442B; at least a portion of the upper portion 410B is configured from an insulating material; when the coil device 100B is viewed from above in the vertical direction, the upper end 210 of the coil device main body 200 is hidden by the upper portion 410B of the cover 400B and cannot be seen; the upper surface 412B and the lower surface 414B of the upper portion 410B are insulated from each other; and the inner surface 4421B and the outer surface 4422B of the side wall portion 442B are configured from an insulating material. As a result, when the coil device 100B of this modified example is used by thermally connecting a member to which heat is to be dissipated to the upper surface 412B of the upper part 410B of the coil device 100B, a constant spatial distance and creepage distance are ensured between the member to which heat is to be dissipated and the coil device 100B. In other words, the coil device 100B of this modified example can ensure a constant spatial distance and creepage distance between the member to which heat is to be dissipated.

[0087] As shown in FIG. 12, a cover 400B of this modification has an insulating member 440B.

[0088] 12, an insulating member 440B of this modification is made of plastic such as polyamide resin, PET resin, etc. The insulating member 440B has the above-mentioned side wall portion 442B, a first eaves portion 444B, and a second eaves portion 446.

[0089] As shown in FIG. 12, the first eaves portion 444B of this modified example extends inward in a horizontal plane perpendicular to the up-down direction from an upper end 4424B of the side wall portion 442B in the up-down direction. The first eaves portion 444B is located above the second eaves portion 446 in the up-down direction. The first eaves portion 444B is located above the metal portion 418 in the up-down direction. The metal portion 418 is sandwiched between the first eaves portion 444B and the second eaves portion 446. The first eaves portion 444B has an upper surface 4442B. The upper surface 4442B faces upward in the up-down direction. The upper surface 4442B is a plane perpendicular to the up-down direction.

[0090] As shown in FIG. 12, the second eaves portion 446 of this modified example extends inward from the side wall portion 442B in a horizontal plane perpendicular to the up-down direction. The second eaves portion 446 is located below the metal portion 418 in the up-down direction. The second eaves portion 446 is located above the insulating portion 417 in the up-down direction. The second eaves portion 446 is sandwiched between the metal portion 418 and the insulating portion 417. The first eaves portion 444B and the second eaves portion 446 are connected by a portion of the side wall portion 442B. The second eaves portion 446 has an upper surface 4462 and a lower surface 4464 in the up-down direction. The upper surface 4462 faces upward in the up-down direction. The upper surface 4462 is a plane perpendicular to the up-down direction. The upper surface 4462 has an inner end 4463 in the direction perpendicular to the up-down direction. The lower surface 4464 faces downward in the vertical direction and is a plane perpendicular to the vertical direction.

[0091] 12, first eaves portion 444B, second eaves portion 446, metal portion 418, and insulating portion 417 constitute upper portion 410B. An upper surface 4442B of first eaves portion 444B and a part of an upper surface 4182 of metal portion 418 constitute upper surface 412B of upper portion 410B. A lower surface 4174 of insulating portion 417 constitutes lower surface 414B of upper portion 410B.

[0092] As shown in FIG. 12, the coil device 100B further includes a connecting member 500 similar to the connecting member 500 of the above-described embodiment.

[0093] 12, the connecting member 500 is located below the upper portion 410B in the up-down direction. The connecting member 500 is interposed between the coil device main body 200 and the upper portion 410B, and thermally connects the coil device main body 200 and the upper portion 410B. The connecting member 500 is located between the upper end 2622 of the coil portion 262 of the coil 260 and the lower surface 414B of the upper portion 410B in the up-down direction. The connecting member 500 is in contact with the upper end 2622 of the coil portion 262 of the coil 260. The connecting member 500 is in contact with the lower surface 414B of the upper portion 410B.

[0094] 12, the insulating portion 417 is sandwiched between the second eaves portion 446 and the connecting member 500. The connecting member 500 is located below the insulating portion 417 in the up-down direction. The connecting member 500 is interposed between the coil component main body 200 and the insulating portion 417, and thermally connects the coil component main body 200 and the insulating portion 417. The connecting member 500 is located between the upper end 2622 of the coil portion 262 of the coil 260 and the lower surface 4174 of the insulating portion 417 in the up-down direction. The connecting member 500 is in contact with the lower surface 4174 of the insulating portion 417.

[0095] (Second embodiment) Referring to FIG. 13, a coil device 100C according to a second embodiment of the present invention is mounted on a substrate (not shown) during use. The substrate extends along a horizontal plane. The coil device 100C of this embodiment is a line filter. However, the present invention is not limited to this, and the present invention can also be applied to coil devices 100C other than line filters.

[0096] As shown in FIG. 13, a coil device 100C includes a coil device main body 200C and a cover 400C.

[0097] 14, the coil device main body 200C of the present embodiment includes a core (not shown) and two coils 260C. Note that the present invention is not limited to this, and the number of coils 260C may be one, or three or more. That is, it is sufficient for the coil device main body 200C to include a core and one coil 260C.

[0098] 14, the core of this embodiment is made of a soft magnetic metal material such as ferrite or nanocrystalline material. However, the present invention is not limited to this, and the material of the core is not particularly limited as long as the core has the necessary magnetic properties. The core of this embodiment is a toroidal core and has a circular ring shape centered on an axis AXC parallel to a second predetermined direction perpendicular to the up-down direction.

[0099] The horizontal plane in this embodiment is the XY plane, the up-down direction in this embodiment is the Z direction, and the second predetermined direction in this embodiment is the X direction. In this embodiment, up is the +Z direction, and down is the -Z direction. Terms such as horizontal plane, up-down direction, and second predetermined direction do not indicate an absolute positional relationship with respect to the ground, but merely indicate a relative positional relationship when the plane on which the substrate extends is defined as the horizontal plane and the position of the coil device 100C with respect to the substrate is defined as the up direction.

[0100] Referring to FIG. 14, each of the coils 260C in this embodiment is a magnet wire made of a round wire 260XC coated with an insulator. More specifically, each of the coils 260C includes only one round conductive wire made of a metal such as copper or aluminum. The conductive wire is coated with an insulator. That is, the cross-sectional shape of the round wire 260XC is circular. However, the present invention is not limited to this. For example, the coil 260C may be a magnet wire made of a flat wire coated with an insulator. The coil 260C is wound around a core. Each of the coils 260C has a coil portion 262C.

[0101] 14, coil portion 262C of the present embodiment is wound around a core. Coil portion 262C has an upper end 2622C and a lower end 2624C in the vertical direction. Upper end 2622C of coil portion 262C is covered by cover 400C.

[0102] As shown in FIG. 14, a coil device body 200C of the present embodiment has an upper end 210C and a lower end 220C in the up-down direction.

[0103] 13 and 14, an upper end 210C of the coil device body 200C is covered with a cover 400C. The upper end 210C of the coil device body 200C is located above, in the up-down direction, an upper end 2622C of a coil portion 262C of a coil 260C.

[0104] 14 , the lower end 220C of the coil component main body 200C is mounted on a substrate when the coil component 100C is in use. More specifically, when the coil component 100C is in use, the lower end 220C of the coil component main body 200C is mounted on the substrate via a pedestal 750C. Note that the present invention is not limited to this, and when the coil component 100C is in use, the lower end 220C of the coil component main body 200C may be mounted directly on the substrate without via the pedestal 750C.

[0105] 13, the cover 400C of the present embodiment defines the top end of the coil device 100C in the up-down direction. To achieve high cooling efficiency for the coil portion 262C that generates heat when current is applied to the coil 260C, the thermal conductivity of the cover 400C is preferably 20 W / mK or higher. The cover 400C has an upper portion 410C and a side wall portion 442C.

[0106] With reference to FIG. 13 , the upper portion 410C of this embodiment is made of an insulating material. Note that the present invention is not limited to this, and it is sufficient that at least a portion of the upper portion 410C is made of an insulating material. With reference to FIGS. 13 and 14 , the upper portion 410C is located above the upper end 210C of the coil component main body 200C in the up-down direction. When the coil component 100C is viewed from above in the up-down direction, the upper end 210C of the coil component main body 200C is hidden by the upper portion 410C and cannot be seen. That is, the upper portion 410C does not have an opening that allows the coil component main body 200C to be seen from above. In other words, the upper end 210C of the coil component main body 200C is completely covered by the upper portion 410C. As a result, when the coil component 100C is used by thermally connecting a component to which heat is to be dissipated to the upper surface 412C of the upper part 410C of the coil component 100C, the necessary spatial distance and creepage distance are ensured between the component to which heat is to be dissipated (not shown) and the coil component 100C.

[0107] 13, upper portion 410C of the present embodiment has upper surface 412C and a lower surface (not shown) in the vertical direction. Upper surface 412C is located above the lower surface in the vertical direction. Upper surface 412C and the lower surface of upper portion 410C are insulated from each other.

[0108] As shown in FIG. 13 , the side wall portion 442C of the present embodiment extends downward in the up-down direction from the outer peripheral edge 416C of the upper side portion 410C. In the up-down direction, the lower end of the side wall portion 442C is located below the upper end 2622C of the coil portion 262C of the coil 260C. With reference to FIGS. 13 and 14 , the side wall portion 442C covers a portion of the coil portion 262C of the coil 260C. The side wall portion 442C covers the upper end 2622C of the coil portion 262C of the coil 260C. As shown in FIG. 13 , the side wall portion 442C does not reach the lower end 220C of the coil device main body 200C. The side wall portion 442C does not reach the lower end 2624C of the coil portion 262C of the coil 260C. When the coil device 100C is viewed in a direction perpendicular to the vertical direction, a portion of the coil device main body 200C is visible. More specifically, when the coil device 100C is viewed in a direction perpendicular to the vertical direction, a portion of the coil portion 262C of the coil 260C is visible. As a result, the coil portion 262C of the coil 260C is not completely covered by the side wall portion 442C, ensuring heat dissipation from the coil portion 262C in a direction perpendicular to the vertical direction. Note that the present invention is not limited to this. As long as the side wall portion 442C does not reach the lower end 220C of the coil device main body 200C, the coil portion 262C may be completely covered by the side wall portion 442C and not visible when the coil device 100C is viewed in a direction perpendicular to the vertical direction. In this embodiment, the upper portion 410C and the side wall portion 442C are made of the same material. As a result, the coil device 100C can have a reduced number of parts and is easy to assemble. In this embodiment, upper portion 410C and side wall portion 442C are made of ceramic.

[0109] Referring to FIG. 13, the side wall portion 442C has a circular cross section with rounded corners in a plane perpendicular to the up-down direction.

[0110] Referring to FIG. 13, the side wall portion 442C has an inner circumferential surface (not shown) and an outer circumferential surface 4422C.

[0111] 13, inner and outer circumferential surfaces 4422C of side wall portion 442C in this embodiment are made of an insulating material. This makes it possible to ensure a long creepage distance between coil device 100C and a member to which heat is to be dissipated, when coil device 100C is used by thermally connecting upper surface 412C of upper portion 410C of coil device 100C to the member to which heat is to be dissipated.

[0112] As described above, the coil device 100C of this embodiment is configured as follows: the coil device 100C includes a coil device main body 200C and a cover 400C; the upper end 210C of the coil device main body 200C is covered by the cover 400C; the cover 400C has an upper portion 410C and a side wall portion 442C; at least a portion of the upper portion 410C is made of an insulating material; when the coil device 100C is viewed from above in the vertical direction, the upper end 210C of the coil device main body 200C is hidden by the upper portion 410C of the cover 400C and cannot be seen; the upper surface 412C and the lower surface 414C of the upper portion 410C are insulated from each other; and the inner and outer circumferential surfaces 4422C of the side wall portion 442C are made of an insulating material. As a result, when coil device 100C of the present embodiment is used by thermally connecting a member to which heat is to be dissipated to upper surface 412C of upper portion 410C, a constant spatial distance and creepage distance are ensured between the member to which heat is to be dissipated and coil device 100C. In other words, coil device 100C of the present embodiment is designed to ensure a constant spatial distance and creepage distance between the member to which heat is to be dissipated.

[0113] Referring to FIG. 13, the coil device 100C further includes a connecting member (not shown) made of a thermally conductive material.

[0114] 13, in this embodiment, the connecting member is located above the coil component main body 200C in the up-down direction. The connecting member is located below the upper portion 410C in the up-down direction. The connecting member is interposed between the coil component main body 200C and the upper portion 410C, and thermally connects the coil component main body 200C and the upper portion 410C. The connecting member is located between the upper end 2622C of the coil portion 262C of the coil 260C and the lower surface of the upper portion 410C in the up-down direction. The connecting member is in contact with the upper end 2622C of the coil portion 262C of the coil 260C. The connecting member is in contact with the lower surface of the upper portion 410C.

[0115] In this embodiment, the thermal conductivity of upper portion 410C is higher than that of the connecting member. More specifically, upper portion 410C is made of an insulating material with a higher thermal conductivity than the connecting member. Note that the present invention is not limited to this, and it is sufficient that the thermal conductivity of at least a part of upper portion 410C is higher than that of the connecting member.

[0116] The thermal conductivity of the connecting member is preferably 2.0 W / mK or higher, and more preferably 3.0 W / mK or higher, in order to achieve high cooling efficiency for the coil portion 262C that generates heat when current is applied to the coil 260C. The connecting member of this embodiment has insulating properties to insulate the two coils 260C from each other. However, the present invention is not limited to this, and if the coil device 100C includes only one coil 260C, the connecting member does not need to have insulating properties. Examples of connecting members include electrically insulating epoxy resin, thermally conductive silicone, thermally conductive epoxy adhesive, and thermally conductive sheets.

[0117] Referring to FIG. 14, the coil device 100C further includes four terminal portions 264C.

[0118] As shown in Fig. 14, the terminal portion 264C in this embodiment extends downward in the up-down direction from the coil portion 262C. The terminal portion 264C defines the bottom end of the coil device 100C in the up-down direction. The two terminal portions 264C are formed integrally with the coil portion 262C. However, the present invention is not limited to this. For example, the terminal portion 264C may be a separate member from the coil portion 262C and welded to the coil portion 262C.

[0119] As shown in FIG. 14, the coil device main body 200C further includes a core case 600C.

[0120] Referring to Fig. 14, the core case 600C of this embodiment is made of plastic such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET), or phenolic resin. However, the present invention is not limited to this, and the material of the core case 600C is not particularly limited as long as the core case 600C has the necessary insulating properties. The core is housed in the core case 600C. The coil 260C is wound around the core case 600C. That is, each of the two coils 260C is wound around the core case 600C.

[0121] As shown in FIG. 14, the core case 600C has two coil-wound portions 620C and two partition portions 630C.

[0122] As shown in FIG. 14, the coil wound portions 620C of this embodiment are aligned in a first predetermined direction that is perpendicular to both the up-down direction and the second predetermined direction. The two coil wound portions 620C are arranged in mirror symmetry with respect to a plane perpendicular to the first predetermined direction and passing through the center of the coil device main body 200C in the first predetermined direction. In this embodiment, the first predetermined direction is the Y direction. The coil portions 262C of the two coils 260C are wound around the two coil wound portions 620C, respectively. Each of the coil wound portions 620C is located between two partition portions 630C in the circumferential direction about the axis AXC. Referring to FIGS. 13 and 14, the side wall portion 442C covers a portion of the coil wound portion 620C.

[0123] As shown in FIG. 14, the partition portions 630C of this modified example are aligned in the vertical direction. The two partition portions 630C are arranged in mirror symmetry with respect to a plane perpendicular to the vertical direction and passing through the center of the coil device main body 200C in the vertical direction. Each of the partition portions 630C is located between the two coil wound portions 620C in the circumferential direction centered on the axis AXC. With reference to FIGS. 13 and 14, the side wall portion 442C covers a portion of the partition portion 630C. However, the present invention is not limited to this, and the side wall portion 442C does not have to cover the partition portion 630C.

[0124] As shown in FIG. 14, the two partitions 630C include a first partition 640 and a second partition 650.

[0125] 14, the first partition portion 640 of the present embodiment is located above the second partition portion 650 in the up-down direction. The upper end 642 of the first partition portion 640 is the upper end 210C of the coil device main body 200C. The side wall portion 442C covers the first partition portion 640. However, the present invention is not limited to this, and the side wall portion 442C does not have to cover the first partition portion 640.

[0126] 14, the second partition portion 650 of the present embodiment is located below the first partition portion 640 in the up-down direction. The lower end of the second partition portion 650 is the lower end 220C of the coil device main body 200C. The second partition portion 650 is located above the lower end 2644C of the terminal portion 264C of the coil 260C in the up-down direction.

[0127] Although the coil components 100, 100A, 100B, and 100C of the present embodiment and the modified examples include two coils 260 and two coils 260C and a core case 600 and a core case 600C, the present invention is not limited to this. That is, the coil components 100, 100A, 100B, and 100C may include three or more coils 260 and two coils 260C, or may include only one coil 260 and two coils 260C. Furthermore, the coil components 100, 100A, 100B, and 100C may not include the core case 600 and sixteenth-century coils 260 and 260C. In this case, the coils 260 and 260C may be wound directly around the insulatingly coated core 240.

[0128] Although the best mode for carrying out the present invention has been described, it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the spirit of the present invention, and such modifications are within the scope of the present invention. [Explanation of symbols]

[0129] 100, 100A, 100B, 100C coil parts 200,200C coil part body 210,210C top end 220,220C bottom end 240 cores 260,260C coil 260X,260XC round wire 262,262C Coil section 2622,2622C top end 2623 Outer edge 2624,2624C lower end 264,264C terminal section 2644,2644C lower end 400, 400A, 400B, 400C Cover 410, 410A, 410B, 410C upper part 412,412A,412B,412C Top surface 4122 Outer edge 414,414A,414B Bottom surface 416,416A,416B,416C Outer edge 417 Insulation section 4172 Top surface 4174 Bottom surface 418 Metal Part 4182 Top surface 4184 Bottom surface 419 Space 440,440B Insulating material 442,442A,442B,442C Side wall part 4421,4421A,4421B Inner surface 4422,4422A,4422B,4422C Outer surface 4424A,4424B Upper end 444 Eaves 444B First eaves 4442,4442B top surface 4443 Inner end 4444 Bottom surface 446 Second eaves 4462 Top surface 4463 Inner end 4464 Bottom surface 470 High thermal conductivity materials 472 Top surface 474 Bottom surface 500 connecting members 600,600C core case 610 Outer circumference 612 recess 620,620C Coil wound part 630,630C Partition 632 Top 634 Bottom end 640 First partition 642 Top 650 Second partition 700 Adhesive 750,750C base 800 boards AX axis AXC axis

Claims

1. A coil component that is mounted on a substrate when in use, The coil component includes a coil component body and a cover, The coil component body includes a core and a coil, The coil is wound around the core, the coil component body has an upper end and a lower end in the up-down direction, the upper end of the coil component body is covered by the cover, the lower end of the coil component body is mounted on the substrate when the coil component is in use, The cover has a top portion and a side wall portion; At least a portion of the upper portion is made of an insulating material, the upper portion is located above the upper end of the coil component body in the up-down direction, When the coil component is viewed from above in the up-down direction, the upper end of the coil component body is hidden by the upper side portion and cannot be seen, The upper portion has an upper surface and a lower surface in the up-down direction, the upper surface and the lower surface of the upper portion are insulated from each other; an inner peripheral surface and an outer peripheral surface of the side wall portion are made of an insulating material, the side wall portion extends downward in the up-down direction from an outer peripheral edge of the upper portion, The side wall portion does not reach the lower end of the coil component body. Coil parts.

2. The coil component according to claim 1, the coil component further includes a connecting member made of a thermally conductive material, the connecting member is interposed between the coil component body and the upper portion and thermally connects the coil component body and the upper portion, The thermal conductivity of at least a portion of the upper portion is higher than the thermal conductivity of the connecting member. Coil parts.

3. The coil component according to claim 2, The upper portion is made of an insulating material having a higher thermal conductivity than the connecting member. Coil parts.

4. The coil component according to claim 3, The upper portion and the side wall portion are made of the same material. Coil parts.

5. The coil component according to claim 3, The cover includes an insulating member and a highly thermally conductive member, the insulating member has the side wall portion and a visor portion, the eaves portion extends inward from an upper end of the side wall portion in the vertical direction within a horizontal plane perpendicular to the vertical direction, the high thermal conductivity member has insulating properties, the thermal conductivity of the high thermal conductivity member is higher than the thermal conductivity of the connection member; The high thermal conductivity member is sandwiched between the eaves portion and the connecting member. Coil parts.

6. The coil component according to claim 2, the upper portion includes an insulating portion and a metallic portion; the insulating portion is located above the connecting member in the up-down direction, The metal portion is located above the insulating portion in the up-down direction. Coil parts.

7. The coil component according to any one of claims 1 to 6, The coil component body further includes a core case, The core is housed in the core case, The coil is wound on the core case, A recess is formed on the outer periphery of the core case, the recess is recessed inward in a horizontal plane perpendicular to the up-down direction, the recess faces the side wall in a direction perpendicular to the up-down direction, The recess is at least partially filled with an adhesive, and the core case is bonded to the side wall portion with the adhesive. Coil parts.

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