Coil parts

Abstract

A coil component is provided that improves the connection strength between the coil and the internal conductor and suppresses an increase in stray capacitance. [Solution] The coil device 1 includes an element body 2, an external conductor 3, a coil 5, and an internal conductor 6. The wiring 53 connects the conductor 52a located at the end to the internal conductor 6. The wiring 53 includes a connecting body 53b and a conductor 53a. The connecting body 53b is located on the internal conductor 6 and adjacent to the wiring 51. The conductor 53a extends along the direction D1 between the connecting body 53b and the conductor 52a located at the end. The portion 531 includes a region overlapping the conductor 53a when viewed from the direction D1 and is adjacent to the wiring 51. The portion 532 is adjacent to the wiring 51 across the portion 531 and does not overlap the conductor 53a when viewed from the direction D1. The area of ​​the region defined by the outer edges of the connecting body 53b when viewed from the direction D1 is larger than the area of ​​the region defined by the outer edges of the conductor 53a when viewed from the direction D1.

Description

[Technical Field]

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

[0002] A known coil component includes an element body, a coil disposed within the element body, an external conductor connected to the coil, and an internal conductor connecting the coil and the external conductor. The element body has, for example, a first main surface and a second main surface facing each other in a first direction. The external conductor is disposed on the first main surface. The coil has a first wiring adjacent to the first main surface, a second wiring adjacent to the second main surface, and a third wiring. The third wiring connects the second wiring and the internal conductor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-141945 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of one aspect of the present invention is to provide a coil component that improves the connection strength between a coil and an internal conductor and suppresses an increase in stray capacitance. [Means for solving the problem]

[0005] A coil component according to one aspect of the present invention comprises an element body, an external conductor, a coil, and an internal conductor. The element body has a first main surface and a second main surface that face each other in a first direction. The external conductor is exposed from the first main surface. The coil is disposed within the element body. The internal conductor is disposed between the external conductor and the coil in the first direction and connects the external conductor and the coil. The coil has a first wiring, a second wiring, and a third wiring. The first wiring includes at least one first conductor adjacent to the first main surface. The second wiring includes a plurality of second conductors adjacent to the second main surface and aligned in a second direction intersecting the first direction. The third wiring connects a second conductor located at an end of the plurality of second conductors in the second direction to the internal conductor. The third wiring includes a connecting body and a third conductor. The connecting body is located on the internal conductor and adjacent to the first wiring. The third conductor extends along the first direction between the connecting body and the second conductor located at the end. The connecting body includes a first portion and a second portion. The first portion includes a region that overlaps the third conductor when viewed from the first direction and is adjacent to the first wiring. The second portion is adjacent to the first wiring with the first portion sandwiched therebetween and does not overlap the third conductor when viewed from the first direction. The area of ​​a region defined by the outer edge of the connecting body when viewed from the first direction is larger than the area of ​​a region defined by the outer edge of the third conductor when viewed from the first direction.

[0006] In one aspect above, the coil is connected to the internal conductor at a connecting body of the third wiring. In a configuration in which the third wiring includes a connecting body, the region where the third wiring and the internal conductor contact includes a region defined by the outer edge of the connecting body as viewed from the first direction. In a configuration in which the third wiring does not include a connecting body, the region where the third wiring and the internal conductor contact includes a region defined by the outer edge of the third conductor as viewed from the first direction. The area of ​​the region defined by the outer edge of the connecting body as viewed from the first direction is larger than the area of ​​the region defined by the outer edge of the third conductor as viewed from the first direction. Therefore, the one aspect above in which the connecting body and the internal conductor are connected can improve the connection strength between the coil and the internal conductor compared to a configuration in which the third wiring and the internal conductor are connected without a connecting body. In one aspect, the connecting body is adjacent to the first wiring. A first portion of the connecting body includes a region overlapping the third conductor when viewed from the first direction and is adjacent to the first wiring. A second portion of the connecting body does not overlap the third conductor when viewed from the first direction. The second portion not overlapping the third conductor is adjacent to the first wiring with the first portion sandwiched therebetween. The first portion is located between the first wiring and the second portion. Therefore, the distance between the first wiring and the second portion is greater than the distance between the first wiring and the first portion. In a configuration in which the portion not overlapping the third conductor is located only between the first wiring and the first portion, the distance between the portion not overlapping the third conductor and the first wiring is smaller than the distance between the first portion and the first wiring. Therefore, compared to a configuration in which the portion not overlapping the third conductor is located only between the first wiring and the first portion, the one aspect in which the second portion is adjacent to the first wiring with the first portion sandwiched therebetween is less likely to generate stray capacitance between the third wiring and the first wiring. As a result, the one aspect can suppress an increase in stray capacitance. [Effects of the Invention]

[0007] One aspect of the present invention provides a coil component that improves the connection strength between a coil and an internal conductor and suppresses an increase in stray capacitance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a coil component according to one embodiment. [Figure 2] FIG. 2 is a plan view of the coil component according to this embodiment as viewed from one side. [Figure 3] FIG. 3 is a plan view of the coil device according to this embodiment as viewed from another side. [Figure 4] FIG. 4 is a plan view of the coil component according to this embodiment as viewed from one main surface. [Figure 5] FIG. 5 is a diagram showing a cross-sectional configuration of the coil component according to this embodiment. [Figure 6] FIG. 6 is a plan view of a coil component according to a modified example, viewed from one side. [Figure 7]FIG. 7 is a diagram showing a cross-sectional configuration of a coil component according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and redundant description will be omitted as appropriate.

[0010] The configuration of a coil component 1 according to this embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view of the coil component according to this embodiment. FIG. 2 is a plan view of the coil component according to this embodiment, viewed from the side surface 2e shown in FIG. 1. FIG. 3 is a plan view of the coil component according to this embodiment, viewed from the side surface 2d shown in FIG. 1. FIG. 4 is a plan view of the coil according to this embodiment, viewed from the main surface 2b shown in FIG. 1. FIG. 5 is a diagram showing the cross-sectional configuration of the coil component according to this embodiment, taken along line VV shown in FIG. 2. The coil component 1 according to this embodiment is solder-mounted to an electronic device. The electronic device includes, for example, a circuit board or an electronic component. As shown in FIGS. 1 to 5, the coil component 1 includes an element body 2, an outer conductor 3, an outer conductor 4, a coil 5, an inner conductor 6, and an inner conductor 7. 1 to 5, 6 and 7, for the sake of explanation, the outline of the element body 2 is shown by a two-dot chain line, and the components other than the element body 2 are shown by solid lines. In reality, the element body 2 is solid. Therefore, in an actual coil component 1, the components inside the element body 2 may not always be visible.

[0011] The element body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes a rectangular parallelepiped shape in which corners and ridges are chamfered and rounded. The element body 2 has principal surfaces 2a and 2b facing each other, side surfaces 2c and 2d facing each other, and side surfaces 2e and 2f facing each other. The principal surfaces 2a and 2b, the side surfaces 2c and 2d, and the side surfaces 2e and 2f each have a rectangular shape. The side surfaces 2c and 2d and the side surfaces 2e and 2f connect the principal surface 2a and the principal surface 2b. The side surfaces 2c and 2d and the side surfaces 2e and 2f are adjacent to each other via the corners or ridges. When the coil component 1 is solder-mounted on an electronic device, the principal surface 2a faces the electronic device to be solder-mounted.

[0012] The main surface 2a and the main surface 2b face each other in direction D1. For example, direction D1 includes a first direction. When the main surface 2a includes the first main surface, the main surface 2b includes the second main surface. The side surfaces 2e and 2f face each other in direction D2. Direction D2 intersects with direction D1. For example, direction D2 includes a second direction. The side surfaces 2c and 2d face each other in direction D3. Direction D3 intersects with directions D1 and D2. For example, direction D3 includes a third direction. In this embodiment, direction D1, direction D2, and direction D3 are perpendicular to each other. In one example, the length of the element body 2 in direction D3 may be greater than the length of the element body 2 in direction D2. The length of the element body 2 in direction D3 may be greater than the length of the element body 2 in direction D1.

[0013] The element body 2 includes multiple insulator layers having electrical insulation properties. In this embodiment, the element body 2 includes multiple insulator layers stacked along direction D1. In an actual element body 2, the multiple insulator layers are integrated to the extent that their boundaries are not visible. Each of the multiple insulator layers has, for example, a rectangular shape when viewed from direction D1.

[0014] The insulator layer is, for example, composed of a sintered ceramic green sheet containing a ferrite material. The ferrite material includes, for example, a Ni-Cu-Zn ferrite material, a Ni-Cu-Zn-Mg ferrite material, or a Ni-Cu ferrite material. The insulator layer may include an Fe alloy. The insulator layer may include a non-magnetic material. The non-magnetic material includes, for example, a glass ceramic material or a dielectric material. The insulator layer may include a resin material. The resin material includes, for example, at least one selected from a liquid crystal polymer, a polyimide resin, a crystalline polystyrene, an epoxy resin, an acrylic resin, a bismaleimide resin, and a fluorine-based resin. The resin material includes, for example, a filler. The filler includes, for example, an inorganic filler. The inorganic filler includes silica. The resin material does not have to include a filler.

[0015] The external conductors 3 and 4 are exposed from the main surface 2a. When the coil component 1 is solder-mounted to an electronic device, the external conductors 3 and 4 are connected to terminals of the electronic device. The external conductors 3 and 4 are spaced apart from each other in the direction D3. The external conductor 3 is located near the side surface 2c, and the external conductor 4 is located near the side surface 2d. In this embodiment, the external conductors 3 and 4 are respectively disposed in a pair of recesses formed in the main surface 2a. The external conductors 3 and 4 are not exposed on the side surfaces 2c, 2d, 2e, and 2f. When viewed from the direction D1, the external conductors 3 and 4 are away from the corners or ridges between the main surface 2a and the side surfaces 2c, 2d, 2e, and 2f. When viewed from the direction D1, the external conductors 3 and 4 have a rectangular shape. The long sides of the external conductors 3 and 4 extend along the direction D2, and the short sides extend along the direction D3.

[0016] The external conductors 3 and 4 include a conductive material. The conductive material includes, for example, Ag, Pd, Cu, or Al. The conductive material includes, for example, an Ag-Pd alloy, an Ag-Cu alloy, an Ag-Au alloy, or an Ag-Pt alloy. The external conductors 3 and 4 include, for example, a Ni plating film, an Sn plating film, a Cu plating film, or an Au plating film. The external conductors 3 and 4 may have a multilayer structure of the above-mentioned plating films, and may include a Ni plating film and an Sn plating film formed on the Ni plating film. The plating film is formed, for example, by electrolytic plating or electroless plating.

[0017] The coil 5 is disposed within the element body 2. The coil axis of the coil 5 is aligned along the direction D2. The coil 5 has a plurality of wires extending around the coil axis. The coil 5 has wires 51, 52, 53, 54, 55, and 56. As shown in FIG. 2, the coil 5 has a rectangular shape when viewed from the direction D2. The coil 5 includes the conductive material described above. The coil 5, the internal conductors 6 and 7, and the external conductors 3 and 4 are electrically connected.

[0018] The wiring 51 is adjacent to the main surface 2a. The wiring 51 includes at least one conductor. The wiring 51 includes conductors 51a, 51b, 51c, and 51d. The conductors 51a, 51b, 51c, and 51d extend along direction D3. The conductors 51a, 51b, 51c, and 51d are aligned in direction D2. The conductor 51a is located at the end closer to side surface 2e in direction D2, and the conductor 51d is located at the end closer to side surface 2f in direction D2. For example, the wiring 51 includes a first wiring, and the conductors 51a, 51b, 51c, and 51d include at least one first conductor.

[0019] The wiring 52 is adjacent to the main surface 2b. The wiring 52 includes a plurality of conductors. The wiring 52 includes conductors 52a, 52b, 52c, 52d, and 52e. The conductors 52a, 52b, 52c, 52d, and 52e each extend along direction D3. The conductors 52a, 52b, 52c, 52d, and 52e are aligned in direction D2. The conductor 52a is located at the end closer to side surface 2e in direction D2, and the conductor 52e is located at the end closer to side surface 2f in direction D2. For example, the wiring 52 includes a second wiring, and the conductors 52a, 52b, 52c, 52d, and 52e include a plurality of second conductors. The conductors 52a and 52e are located at the ends in direction D2.

[0020] The wiring 53 connects the conductor 52a and the internal conductor 6. The wiring 53 is connected to the external conductor 3 via the internal conductor 6. The wiring 53 is adjacent to the side surface 2c. In the coil 5, the wiring 53 is located at the end closer to the side surface 2e in the direction D2. For example, the wiring 53 includes a third wiring. The wiring 53 includes a conductor 53a and a connecting body 53b. The conductor 53a is connected to the conductor 52a. The conductor 53a extends along the direction D1 between the conductor 52a and the connecting body 53b. For example, the conductor 53a is a portion of the wiring 53 that is closer to the main surface 2b than the wiring 51 in the direction D1. The connecting body 53b is connected to the internal conductor 6. The connecting body 53b is located on the internal conductor 6. The connecting body 53b is adjacent to the wiring 51. As shown in FIG. 5 , in a cross section perpendicular to the direction D1, the connecting body 53b is adjacent to the wiring 51. The connecting body 53b is adjacent to the wiring 51 in the direction perpendicular to the direction D1. For example, the connecting body 53b is adjacent to the wiring 51 in the direction D2. For example, the connecting body 53b is adjacent to the wiring 51 in the direction D3. Specifically, the connector 53b is adjacent to the conductor 51a among the plurality of conductors 51a, 51b, 51c, and 51d. The shortest distance between the connector 53b and the principal surface 2b may be equal to the shortest distance between the wiring 51 and the principal surface 2b. For example, the conductor 53a includes a third conductor.

[0021] The wiring 55 connects the conductor 52e and the internal conductor 7. The wiring 55 is connected to the external conductor 4 via the internal conductor 7. The wiring 55 is adjacent to the side surface 2d. In the coil 5, the wiring 55 is located at the end closer to the side surface 2f in the direction D2. For example, the wiring 55 includes a third wiring. The wiring 55 includes a conductor 55a and a connecting body 55b. The conductor 55a is connected to the conductor 52e. The conductor 55a extends along the direction D1 between the conductor 52e and the connecting body 55b. For example, the conductor 55a is a portion of the wiring 55 that is closer to the main surface 2b than the wiring 51 in the direction D1. The connecting body 55b is connected to the internal conductor 7. The connecting body 55b is located on the internal conductor 7. The connecting body 55b is adjacent to the wiring 51. As shown in FIG. 5 , in a cross section perpendicular to the direction D1, the connecting body 55b is adjacent to the wiring 51. The connecting body 55b is adjacent to the wiring 51 in the direction perpendicular to the direction D1. For example, the connecting body 55b is adjacent to the wiring 51 in the direction D2. For example, the connecting body 55b is adjacent to the wiring 51 in the direction D3. Specifically, the connecting body 55b is adjacent to the conductor 51d among the plurality of conductors 51a, 51b, 51c, and 51d. The shortest distance between the connecting body 55b and the principal surface 2b may be equal to the shortest distance between the wiring 51 and the principal surface 2b. For example, the conductor 55a includes a third conductor.

[0022] The wiring 54 connects the wiring 51 and the wiring 52. The wiring 54 is adjacent to the side surface 2c. The wiring 54 includes at least one conductor. The wiring 54 includes conductors 54a, 54b, 54c, and 54d. As shown in FIG. 4, the shortest distance between the conductors 54a, 54b, 54c, and 54d and the side surface 2c may be equal to the shortest distance between the external conductor 3 and the side surface 2c. The conductors 54a, 54b, 54c, and 54d extend along direction D1. The conductors 54a, 54b, 54c, and 54d are aligned in direction D2. The conductor 54d is located at the end closer to the side surface 2f. The conductor 54a is adjacent to the conductor 53a in direction D2.

[0023] The wiring 56 connects the wiring 51 and the wiring 52. The wiring 56 is adjacent to the side surface 2d. The wiring 56 includes at least one conductor. The wiring 56 includes conductors 56a, 56b, 56c, and 56d. As shown in FIG. 4, the shortest distance between the conductors 56a, 56b, 56c, and 56d and the side surface 2d may be equal to the shortest distance between the external conductor 4 and the side surface 2d. The conductors 56a, 56b, 56c, and 56d extend along direction D1. The conductors 56a, 56b, 56c, and 56d are aligned in direction D2. The conductor 56a is located at the end closer to the side surface 2e. The conductor 56d is adjacent to the conductor 55a in direction D2.

[0024] For example, wiring 54 and 56 include fifth wiring, and conductors 54a, 54b, 54c, 54d, 56a, 56b, 56c, and 56d include at least one fifth conductor. In this specification, "equal" does not necessarily mean that values ​​are the same. Values ​​may be considered equal even if they include slight differences within a preset range, manufacturing errors, or measurement errors.

[0025] Conductor 53a and connecting body 53b connect the internal conductor 6 and conductor 52a. Conductor 56a connects conductor 52a and conductor 51a. Conductor 54a connects conductor 51a and conductor 52b. Conductor 56b connects conductor 52b and conductor 51b. Conductor 54b connects conductor 51b and conductor 52c. Conductor 56c connects conductor 52c and conductor 51c. Conductor 54c connects conductor 51c and conductor 52d. Conductor 56d connects conductor 52d and conductor 51d. Conductor 54d connects conductor 51d and conductor 52e. Conductor 55a and connecting body 55b connect conductor 52e and internal conductor 7.

[0026] The internal conductors 6, 7 are arranged between the external conductors 3, 4 and the coil 5 in the direction D1. The internal conductors 6, 7 connect the external conductors 3, 4 and the coil 5. The internal conductors 6, 7 are not adjacent to the wiring 51. In a cross section perpendicular to the direction D1, the internal conductors 6, 7 are not adjacent to the wiring 51. The internal conductors 6, 7 are not adjacent to the wiring 51 in a direction perpendicular to the direction D1. The internal conductors 6, 7 include the above-mentioned conductive material. The internal conductor 6 is disposed between the external conductor 3 and the coil 5 in the direction D1. Specifically, the internal conductor 6 is disposed between the external conductor 3 and the wiring 53 of the coil 5 in the direction D1. The internal conductor 6 connects the external conductor 3 and the wiring 53 of the coil 5. In an actual coil component 1, the wiring 53 and the internal conductor 6 are integrated to the extent that the boundary between them is not visible. For example, the internal conductor 6 is a portion of the wiring 53 and the internal conductor 6 that is closer to the main surface 2a than the wiring 51 in the direction D1. The internal conductor 7 is disposed between the external conductor 4 and the coil 5 in the direction D1. Specifically, the internal conductor 7 is disposed between the external conductor 4 and the wiring 55 of the coil 5 in the direction D1. The internal conductor 7 connects the external conductor 4 and the wiring 55 of the coil 5. In an actual coil component 1, the wiring 55 and the internal conductor 7 are integrated to the extent that the boundary between them is not visible. For example, the internal conductor 7 is the portion of the wiring 55 and the internal conductor 7 that is closer to the main surface 2a than the wiring 51 in the direction D1.

[0027] The connecting body 53b includes a portion 531 and a portion 532. The portion 531 includes a region overlapping the conductor 53a when viewed from the direction D1, and is adjacent to the wiring 51. In this embodiment, the portion 531 consists only of the region overlapping the conductor 53a when viewed from the direction D1. The portion 532 is adjacent to the wiring 51 with the portion 531 sandwiched therebetween. When viewed from the direction D1, the portion 532 does not overlap the conductor 53a. The portion 531 is located between the portion 532 and the wiring 51. For example, the portion 531 is located between the portion 532 and the wiring 51 in the direction D2. As shown in FIG. 5 , the area of ​​the region defined by the outer edge of the connecting body 53b when viewed from the direction D1 is larger than the area of ​​the region defined by the outer edge of the conductor 53a when viewed from the direction D1. The area of ​​the region defined by the outer edge of connecting body 53b as viewed from direction D1 is the sum of the area of ​​portion 531 as viewed from direction D1 and the area of ​​portion 532 as viewed from direction D1. For example, portion 531 includes a first portion, and portion 532 includes a second portion. The distance between connecting body 53b and principal surface 2b is the distance between portion 532 and wiring 51. The boundary between conductor 53a and connecting body 53b in wiring 51 may be defined by, for example, an imaginary plane including a surface of portion 532 facing principal surface 2b.

[0028] The width between the outer edge of conductor 53a as viewed from direction D1 and the outer edge of connecting body 53b as viewed from direction D1 is greatest at portion 532. The "width" is, for example, the shortest distance between a point located on the outer edge of connecting body 53b as viewed from direction D1 and the outer edge of conductor 53a as viewed from direction D1. In this embodiment, the region of connecting body 53b that does not overlap conductor 53a as viewed from direction D1 is not located between the region of connecting body 53b that overlaps conductor 53a as viewed from direction D1 and wiring 51. Portion 531 does not include the region that does not overlap conductor 53a as viewed from direction D1. The surface of the conductor 53a facing the side surface 2f and the surface of the connecting body 53b facing the side surface 2f are flush with each other. The surface of the connecting body 53b facing the side surface 2f and the surface of the internal conductor 6 facing the side surface 2f are flush with each other. The surface of the conductor 53a facing the side surface 2d and the surface of the connecting body 53b facing the side surface 2d are flush with each other. The surface of the connecting body 53b facing the side surface 2d and the surface of the internal conductor 6 facing the side surface 2d are flush with each other. The outer edge of conductor 53a facing side surface 2f as viewed from direction D1 and the outer edge of connecting body 53b facing side surface 2f as viewed from direction D1 overlap each other. The outer edge of conductor 53a facing side surface 2d as viewed from direction D1 and the outer edge of connecting body 53b facing side surface 2d as viewed from direction D1 overlap each other. As a result, the width between the outer edge of conductor 53a as viewed from direction D1 and the outer edge of connecting body 53b as viewed from direction D1 is zero in portion 531.

[0029] Portion 532 includes a region adjacent to wiring 51 in direction D2 with portion 531 sandwiched therebetween. Portion 532 consists only of a region adjacent to wiring 51 in direction D2 with portion 531 sandwiched therebetween. Portion 532 does not include a region adjacent to wiring 51 in direction D3 with portion 531 sandwiched therebetween, and therefore the length in direction D3 of the region of portion 532 adjacent to wiring 51 in direction D3 with portion 531 sandwiched therebetween is 0. The length in direction D2 of the region of portion 532 adjacent to wiring 51 in direction D2 with portion 531 sandwiched therebetween is greater than the length in direction D3 of the region of portion 532 adjacent to wiring 51 in direction D3 with portion 531 sandwiched therebetween. The surface of conductor 53a facing side surface 2c is flush with the surface of connecting body 53b facing side surface 2c. The surface of connecting body 53b facing side surface 2c is flush with the surface of inner conductor 6 facing side surface 2c. The surface of inner conductor 6 facing side surface 2c is flush with the surface of outer conductor 3 facing side surface 2c. The outer edge of the conductor 53a facing the side surface 2c when viewed from the direction D1 and the outer edge of the connecting body 53b facing the side surface 2c when viewed from the direction D1 overlap each other. The shortest distance between the connecting body 53b and the side surface 2c may be equal to the shortest distance between the wiring 51 and the side surface 2c. The surface of the connecting body 53b facing the side surface 2e is flush with the surface of the internal conductor 6 facing the side surface 2e. The surface of the internal conductor 6 facing the side surface 2e is flush with the surface of the external conductor 3 facing the side surface 2e.

[0030] The connecting body 55b includes a portion 551 and a portion 552. The portion 551 includes a region overlapping the conductor 55a when viewed from the direction D1, and is adjacent to the wiring 51. In this embodiment, the portion 551 consists only of the region overlapping the conductor 55a when viewed from the direction D1. The portion 552 is adjacent to the wiring 51 with the portion 551 sandwiched therebetween. When viewed from the direction D1, the portion 552 does not overlap the conductor 55a. The portion 551 is located between the portion 552 and the wiring 51. For example, the portion 551 is located between the portion 552 and the wiring 51 in the direction D2. As shown in FIG. 5, the area of ​​the region defined by the outer edge of the connecting body 55b when viewed from the direction D1 is larger than the area of ​​the region defined by the outer edge of the conductor 55a when viewed from the direction D1. The area of ​​the region defined by the outer edge of connecting body 55b as viewed from direction D1 is the sum of the area of ​​portion 551 as viewed from direction D1 and the area of ​​portion 552 as viewed from direction D1. For example, portion 551 includes a first portion, and portion 552 includes a second portion. The distance between connecting body 55b and principal surface 2b is the distance between portion 552 and wiring 51. The boundary between conductor 55a and connecting body 55b in wiring 51 may be defined, for example, by an imaginary plane including the surface of portion 552 facing principal surface 2b.

[0031] The width between the outer edge of conductor 55a as viewed from direction D1 and the outer edge of connecting body 55b as viewed from direction D1 is greatest at portion 552. The "width" is, for example, the shortest distance between a point located on the outer edge of connecting body 55b as viewed from direction D1 and the outer edge of conductor 55a as viewed from direction D1. In this embodiment, the region of connecting body 55b that does not overlap conductor 55a as viewed from direction D1 is not located between the region of connecting body 55b that overlaps conductor 55a as viewed from direction D1 and wiring 51. Portion 551 does not include the region that does not overlap conductor 55a as viewed from direction D1. The surface of conductor 55a facing side surface 2e and the surface of connecting body 55b facing side surface 2e are flush with each other. The surface of connecting body 55b facing side surface 2e and the surface of internal conductor 7 facing side surface 2e are flush with each other. The surface of conductor 55a facing side surface 2c and the surface of connecting body 55b facing side surface 2c are flush with each other. The surface of connecting body 55b facing side surface 2c and the surface of internal conductor 7 facing side surface 2c are flush with each other. The outer edge of conductor 55a facing side surface 2e as viewed from direction D1 and the outer edge of connecting body 55b facing side surface 2e as viewed from direction D1 overlap each other. The outer edge of conductor 55a facing side surface 2c as viewed from direction D1 and the outer edge of connecting body 55b facing side surface 2c as viewed from direction D1 overlap each other. As a result, the width between the outer edge of conductor 55a as viewed from direction D1 and the outer edge of connecting body 55b as viewed from direction D1 is zero in portion 551.

[0032] Portion 552 includes a region adjacent to wiring 51 in direction D2 with portion 551 sandwiched therebetween. Portion 552 consists only of a region adjacent to wiring 51 in direction D2 with portion 551 sandwiched therebetween. Portion 552 does not include a region adjacent to wiring 51 in direction D3 with portion 551 sandwiched therebetween, and therefore the length in direction D3 of the region of portion 552 adjacent to wiring 51 in direction D3 with portion 551 sandwiched therebetween is 0. The length in direction D2 of the region of portion 552 adjacent to wiring 51 in direction D2 with portion 551 sandwiched therebetween is greater than the length in direction D3 of the region of portion 552 adjacent to wiring 51 in direction D3 with portion 551 sandwiched therebetween. The surface of conductor 55a facing side surface 2d is flush with the surface of connecting body 55b facing side surface 2d. The surface of connecting body 55b facing side surface 2d is flush with the surface of inner conductor 7 facing side surface 2d. The surface of inner conductor 7 facing side surface 2d is flush with the surface of outer conductor 3 facing side surface 2d. The outer edge of the conductor 55a facing the side surface 2d when viewed from the direction D1 and the outer edge of the connecting body 55b facing the side surface 2d when viewed from the direction D1 overlap each other. The shortest distance between the connecting body 55b and the side surface 2d may be equal to the shortest distance between the wiring 51 and the side surface 2d. The surface of the connecting body 55b facing the side surface 2f is flush with the surface of the internal conductor 7 facing the side surface 2f. The surface of the internal conductor 7 facing the side surface 2f is flush with the surface of the external conductor 3 facing the side surface 2f.

[0033] The wiring 51 is located between the portion 531 and the portion 551. The portions 532 and 552 are not located between the portion 531 and the portion 551. At least a part of the portions 531 and 551 is located between the portion 532 and the portion 552.

[0034] Next, the configuration of a coil component 1A according to a modified example of this embodiment will be described with reference to Figs. 6 and 7. In the coil component 1A according to this modified example, the coil 5 has wirings 53A and 55A instead of the wirings 53 and 55. Fig. 6 is a plan view of the coil component according to the modified example as viewed from the side surface 2e. Fig. 7 is a diagram showing the cross-sectional configuration of the coil component according to the modified example taken along line VII-VII shown in Fig. 6. The following mainly describes the differences between the above-described embodiment and this modified example, and redundant explanations will be omitted where appropriate.

[0035] In the wiring 53A, the portion 531 is located between the portion 532 and the wiring 51 in the direction D3. The portion 532 includes a region adjacent to the wiring 51 in the direction D3 with the portion 531 sandwiched therebetween. The portion 532 consists only of a region adjacent to the wiring 51 in the direction D3 with the portion 531 sandwiched therebetween. The portion 532 does not include a region adjacent to the wiring 51 in the direction D2 with the portion 531 sandwiched therebetween, and therefore the length in the direction D2 of the region of the portion 532 adjacent to the wiring 51 in the direction D2 with the portion 531 sandwiched therebetween is zero. The length in the direction D3 of the region of the portion 532 adjacent to the wiring 51 in the direction D3 with the portion 531 sandwiched therebetween is greater than the length in the direction D2 of the region of the portion 532 adjacent to the wiring 51 in the direction D2 with the portion 531 sandwiched therebetween. In coil device 1A, the surface of conductor 53a facing side surface 2e is flush with the surface of connecting body 53b facing side surface 2e. The surface of connecting body 53b facing side surface 2e is flush with the surface of internal conductor 6 facing side surface 2e. The surface of internal conductor 6 facing side surface 2e is flush with the surface of external conductor 3 facing side surface 2e. The outer edge of the conductor 53a facing the side surface 2e when viewed from the direction D1 and the outer edge of the connecting body 53b facing the side surface 2e when viewed from the direction D1 overlap each other. The shortest distance between the connecting body 53b and the side surface 2e may be equal to the shortest distance between the wiring 51 and the side surface 2e. The surface of the connecting body 53b facing the side surface 2c is flush with the surface of the internal conductor 6 facing the side surface 2c. The surface of the internal conductor 6 facing the side surface 2c is flush with the surface of the external conductor 3 facing the side surface 2c. In the wiring 55A, the portion 551 is located between the portion 552 and the wiring 51 in the direction D3. The portion 552 includes a region adjacent to the wiring 51 in the direction D3 with the portion 551 therebetween. The portion 552 consists only of a region adjacent to the wiring 51 in the direction D3 with the portion 551 therebetween. The portion 552 does not include a region adjacent to the wiring 51 in the direction D2 with the portion 551 therebetween, and therefore the length in the direction D2 of the region of the portion 552 adjacent to the wiring 51 in the direction D2 with the portion 551 therebetween is 0. The length in the direction D3 of the region of the portion 552 adjacent to the wiring 51 in the direction D3 with the portion 551 therebetween is greater than the length in the direction D2 of the region of the portion 552 adjacent to the wiring 51 in the direction D2 with the portion 551 therebetween. In coil device 1A, the surface of conductor 55a facing side surface 2f and the surface of connecting body 55b facing side surface 2f are flush with each other. The surface of connecting body 55b facing side surface 2f and the surface of internal conductor 7 facing side surface 2f are flush with each other. The surface of internal conductor 7 facing side surface 2f and the surface of external conductor 3 facing side surface 2f are flush with each other. The outer edge of the conductor 55a facing the side surface 2f when viewed from the direction D1 and the outer edge of the connecting body 55b facing the side surface 2f when viewed from the direction D1 overlap each other. The shortest distance between connecting body 55b and side surface 2f may be equal to the shortest distance between wiring 51 and side surface 2f. The surface of connecting body 55b facing side surface 2d is flush with the surface of internal conductor 7 facing side surface 2d. The surface of internal conductor 7 facing side surface 2d is flush with the surface of external conductor 3 facing side surface 2d.

[0036] As described above, the coil 5 is connected to the internal conductors 6 and 7 at the connecting bodies 53b and 55b of the wirings 53 and 55. The regions in the coil component 1 and 1A where the wirings 53 and 55 contact the internal conductors 6 and 7 include the region defined by the outer edges of the connecting bodies 53b and 55b as viewed from the direction D1. The area of ​​the region defined by the outer edges of the connecting bodies 53b and 55b as viewed from the direction D1 is larger than the area of ​​the region defined by the outer edges of the conductors 53a and 55a as viewed from the direction D1. Therefore, the coil component 1 and 1A can improve the connection strength between the coil 5 and the internal conductors 6 and 7 compared to a coil component in which the internal conductors 6 and 7 are connected to wirings 53 and 55 that do not include the connecting bodies 53b and 55b. As described above, the connecting bodies 53b and 55b are adjacent to the wiring 51. The portions 531 and 551 of the connecting bodies 53b and 55b include areas that overlap the conductors 53a and 55a when viewed from the direction D1, and are adjacent to the wiring 51. The portions 532 and 552 of the connecting bodies 53b and 55b are adjacent to the wiring 51 with the portions 531 and 551 sandwiched therebetween, and do not overlap the conductors 53a and 55a when viewed from the direction D1. The portions 532 and 552 of the connecting bodies 53b and 55b do not overlap the conductors 53a and 55a. The portions 531 and 551 are located between the wiring 51 and the portions 532 and 552. Therefore, the distance between the wiring 51 and the portions 532 and 552 is greater than the distance between the wiring 51 and the portions 531 and 551. In a configuration in which the portions that do not overlap with the conductors 53a, 55a are located only between the wiring 51 and the portions 531, 551, the distance between the wiring 51 and the portions that do not overlap is shorter than the distance between the wiring 51 and the portions 531, 551. Therefore, compared to a configuration in which the portions that do not overlap with the conductors 53a, 55a are located only between the wiring 51 and the portions 531, 551, the coil device 1, 1A is less likely to generate stray capacitance between the wiring 53, 55 and the wiring 51. As a result, the coil device 1, 1A can suppress an increase in stray capacitance.

[0037] In the coil devices 1 and 1A, the width between the outer edges of the conductors 53a and 55a as viewed from the direction D1 and the outer edges of the connecting bodies 53b and 55b as viewed from the direction D1 is greatest at the portions 532 and 552. In the coil component 1, 1A, the width between the outer edges of the conductors 53a, 55a as seen from the direction D1 and the outer edges of the connecting bodies 53b, 55b as seen from the direction D1 is greatest at portions 532, 552. In the coil component 1, 1A, there is less conductor interposed between the wiring 51 and the region of the connecting bodies 53b, 55b that overlaps with the conductors 53a, 55a as seen from the direction D1, compared to a configuration in which the width between the outer edges of the conductors 53a, 55a as seen from the direction D1 and the outer edges of the connecting bodies 53b, 55b as seen from the direction D1 is greatest at portions 531, 551. Therefore, the coil component 1, 1A in which the width between the outer edges of the conductors 53a, 55a as seen from the direction D1 and the outer edges of the connecting bodies 53b, 55b as seen from the direction D1 is greatest at portions 532, 552 is even less likely to generate stray capacitance between the wiring 53, 55 and the wiring 51. As a result, the coil components 1 and 1A can further suppress an increase in stray capacitance.

[0038] In the coil component 1, the length in the direction D2 of the region adjacent to the wiring 51 with the portion 531 therebetween in the direction D2 is greater than the length in the direction D3 of the region adjacent to the wiring 51 with the portion 531 therebetween in the direction D3. A configuration in which the length in direction D2 of the region adjacent to wiring 51 with portion 531 therebetween in direction D2 is greater than the length in direction D3 of the region adjacent to wiring 51 with portion 531 therebetween in direction D3 can make coil 5 larger in direction D3. Because the coil axis of coil 5 is along direction D2, a configuration in which coil 5 is larger in direction D3 can make coil 5 larger. Therefore, the inductance of coil component 1 can be increased.

[0039] In the coil component 1A, the length in direction D3 of the region adjacent to the wiring 51 with the portion 531 therebetween in direction D3 is greater than the length in direction D2 of the region adjacent to the wiring 51 with the portion 531 therebetween in direction D2. A configuration in which the length in direction D3 of the region adjacent to wiring 51 with portion 531 therebetween in direction D3 is greater than the length in direction D2 of the region adjacent to wiring 51 with portion 531 therebetween in direction D2 can increase the size of coil 5 in direction D2. Because the coil axis of coil 5 is along direction D2, a configuration in which coil 5 is increased in direction D2 can increase the number of turns of coil 5. Therefore, the inductance of coil device 1A can be increased.

[0040] In the coil components 1, 1A, the areas of the connecting bodies 53b, 55b that do not overlap with the conductors 53a, 55a when viewed from the direction D1 are not positioned between the wiring 51 and the areas of the connecting bodies 53b, 55b that overlap with the conductors 53a, 55a when viewed from the direction D1. In the coil component 1, 1A, compared to a configuration in which the regions of the connecting bodies 53b, 55b that do not overlap with the conductors 53a, 55a as viewed from the direction D1 are disposed between the wiring 51 and the regions of the connecting bodies 53b, 55b that overlap with the conductors 53a, 55a as viewed from the direction D1, there are fewer conductors interposed between the regions of the connecting bodies 53b, 55b that overlap with the conductors 53a, 55a as viewed from the direction D1 and the wiring 51. Therefore, the coil component 1, 1A in which the regions of the connecting bodies 53b, 55b that do not overlap with the conductors 53a, 55a as viewed from the direction D1 are not disposed between the regions of the connecting bodies 53b, 55b that overlap with the conductors 53a, 55a as viewed from the direction D1 and the wiring 51 is even less likely to generate stray capacitance between the wiring 53, 55 and the wiring 51. As a result, the coil component 1, 1A can further suppress an increase in stray capacitance.

[0041] The present invention has been described in detail above based on the embodiments and modifications thereof. However, the present invention is not limited to the above embodiments and modifications. Various modifications of the present invention are possible without departing from the spirit and scope of the present invention.

[0042] The external conductors 3 and 4 may be disposed on the main surface 2a. When viewed from the direction D1, the external conductors 3 and 4 may overlap corners or ridges between the main surface 2a and the side surfaces 2c, 2d, 2e, and 2f. The external conductors 3 and 4 may be exposed on the side surfaces 2c, 2d, 2e, and 2f. At least one of the wiring 53 and the wiring 55 may include the third wiring. At least one of the wiring 53 and the wiring 55 may include a connector. The conductors 53a and 55a are not necessarily portions of the wirings 53 and 55 that are closer to the main surface 2b in the direction D1 than the wiring 51. The conductors 53a and 55a may be portions of the wirings 53 and 55 that are farther from the main surface 2b in the direction D1 than the wiring 51. The conductors 53a and 55a may be portions of the wirings 53 and 55 that are connected to the conductors 52a and 52e that are located at the ends in the direction D2 among the multiple conductors 52a, 52b, 52c, 52d, and 52e, and may be portions other than the connectors 53b and 55b. The shortest distance between the connectors 53b, 55b and the main surface 2b does not have to be equal to the shortest distance between the wiring 51 and the main surface 2b. The shortest distance between the connectors 53b, 55b and the main surface 2b may be smaller than the shortest distance between the wiring 51 and the main surface 2b, or may be larger than the shortest distance between the wiring 51 and the main surface 2b. The width between the outer edges of the conductors 53a and 55a as viewed from the direction D1 and the outer edges of the connecting bodies 53b and 55b as viewed from the direction D1 may be maximum in the portions 531 and 551. The width between the outer edges of the conductors 53a and 55a as viewed from the direction D1 and the outer edges of the connecting bodies 53b and 55b as viewed from the direction D1 may be non-zero in the portions 532 and 552. When viewed from direction D1, portions 531 and 551 may include portions that do not overlap with conductors 53a and 55a. Portions of portions 531 and 551 that do not overlap with conductors 53a and 55a may be located between portions 531 and 551 and wiring 51. The portions 532 and 552 may include at least one of a region adjacent to the wiring 51 in the direction D2 with the portions 531 and 551 therebetween and a region adjacent to the wiring 51 in the direction D3 with the portions 531 and 551 therebetween. The portions 532 and 552 may include both a region adjacent to the wiring 51 in the direction D2 with the portions 531 and 551 therebetween and a region adjacent to the wiring 51 in the direction D3 with the portions 531 and 551 therebetween. The coil axis of the coil 5 may be aligned along the direction D3. The conductors 52a, 52b, 52c, 52d, and 52e may be aligned in the direction D3.

[0043] As can be understood from the above description of the embodiments, the present specification includes disclosure of the following aspects.

[0044] The coil component includes a pair of external conductors including the external conductor and a pair of internal conductors including the internal conductor. The pair of external conductors are exposed from the first main surface. The pair of internal conductors are arranged between the pair of external conductors and the coil in the first direction and connect the pair of external conductors and the coil. The coil has a pair of third wirings including the third wiring. The pair of third wirings connect the pair of internal conductors to a pair of second conductors located at both ends in the second direction among the plurality of second conductors. The first wiring is located between a first portion included in one of the pair of third wirings and a first portion included in the other third wiring of the pair of third wirings. The second portion included in one of the pair of third wirings and a second portion included in the other third wiring of the pair of third wirings are not located between the first portion included in one of the pair of third wirings and a first portion included in the other third wiring of the pair of third wirings. The first portion included in one of the pair of third wirings and a first portion included in the other third wiring of the pair of third wirings are located between a second portion included in one of the pair of third wirings and a second portion included in the other third wiring of the pair of third wirings. [Explanation of symbols]

[0045] 1, 1A... coil component, 2... element body, 2a, 2b... main surface, 3, 4... external conductor, 5... coil, 51, 52, 53, 55... wiring, 51a, 51b, 51c, 51d, 52a, 52b, 52c, 52d, 52e, 53a, 55a... conductor, 53b, 55b... connecting body, 531, 532, 551, 552... part, 6, 7... internal conductor, D1, D2, D3... direction.

Claims

1. an element body having a first main surface and a second main surface opposing each other in a first direction; an outer conductor exposed from the first main surface; a coil disposed within the element body; an inner conductor disposed between the outer conductor and the coil in the first direction and connecting the outer conductor and the coil; The coil is a first wiring including at least one first conductor adjacent to the first main surface; a second wiring adjacent to the second main surface and including a plurality of second conductors arranged in a second direction intersecting the first direction; a third wiring that connects the second conductor located at an end in the second direction among the plurality of second conductors to the internal conductor, The third wiring is a connecting body located on the internal conductor and adjacent to the first wiring; a third conductor extending along the first direction between the connecting body and the second conductor located at the end, The connector is a first portion including a region overlapping the third conductor when viewed from the first direction and adjacent to the first wiring; a second portion adjacent to the first wiring with the first portion interposed therebetween and not overlapping with the third conductor when viewed from the first direction, an area of ​​a region defined by an outer edge of the connecting body as viewed from the first direction is larger than an area of ​​a region defined by an outer edge of the third conductor as viewed from the first direction; Coil parts.

2. a width between the outer edge of the third conductor as viewed from the first direction and the outer edge of the connecting body as viewed from the first direction is maximized in the second portion; The coil component according to claim 1 .

3. the second portion includes at least one of a region adjacent to the first wiring in the second direction with the first portion interposed therebetween, and a region adjacent to the first wiring in a third direction intersecting the first direction and the second direction with the first portion interposed therebetween, The coil component according to claim 2 .

4. a length in the second direction of the region adjacent to the first wiring with the first portion interposed therebetween is greater than a length in the third direction of the region adjacent to the first wiring with the first portion interposed therebetween; The coil component according to claim 3 .

5. a length in the third direction of the region adjacent to the first wiring with the first portion interposed therebetween is greater than a length in the second direction of the region adjacent to the first wiring with the first portion interposed therebetween; The coil component according to claim 3 .

6. a region of the connecting body that does not overlap with the third conductor as viewed from the first direction is not located between the region that overlaps with the third conductor as viewed from the first direction and the first wiring; The coil component according to any one of claims 1 to 5.

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