Coil component

Abstract

Provided is a coil component capable of improving the fixing strength of an external terminal. In the coil component, the center position of the external terminal electrode in the first direction is biased toward the center position of the end surface on the end surface of the body, compared to the center position of the outer end portion. Therefore, on the center position side of the end surface, the fixing area of the external terminal electrode and the body can be enlarged, and thus the fixing strength of the external terminal electrode and the body can be improved.

Description

Technical Field

[0001] This invention relates to coil components. Background Technology

[0002] Previously, a coil component having multiple coils disposed within a substrate was known. Patent Document 1 disclosed a coil component with two coils disposed within a substrate and having four terminals.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-130472 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] In the coil component described above, multiple external terminals are provided on the end face of the substrate. Therefore, compared with the structure in which only one external terminal is provided on the end face of the substrate, the area forming the external terminal is narrow, making it difficult to adequately ensure the adhesion strength of the external terminal relative to the substrate.

[0008] The inventors of this invention have repeatedly studied the adhesion strength of external terminals and discovered a new technology that can improve the adhesion strength of external terminals.

[0009] The purpose of this invention is to provide a coil component that can improve the fixation strength of external terminals.

[0010] Means for solving technical problems

[0011] One aspect of the present invention includes a coil component comprising: a body made of resin containing metallic magnetic powder having a first end face and a second end face parallel to each other; an insulating substrate disposed within the body, extending orthogonal to the first end face and the second end face, and exposed between the first end face and the second end face; a pair of coil portions disposed on the insulating substrate, each having a first end face exposed on the first end face, and the first end faces of the pair of coil portions being located on both sides of the center position of the first end face in a first direction extending from the insulating substrate; and a pair of first external terminals disposed on the first end face, each connected to the first end face of the pair of coil portions, and the pair of first external terminals being located on both sides of the center position of the first end face in a first direction, wherein the center position of the first external terminals is offset from the center position of the first end face in the first direction of the first end face.

[0012] In the above-mentioned coil component, on the first end face, the center position of the first external terminal is offset from the center position side of the first end face compared to the center position side of the first end face. Therefore, on the center position side of the first end face, the bonding area between the first external terminal and the substrate can be increased, thereby improving the bonding strength between the first external terminal and the substrate.

[0013] In another aspect of the present invention, in the coil component, the first end face has a rectangular shape extending in a first direction, and in the first direction of the first end face, the distance between the edge of the first end of the coil portion closer to the center of the first end face and the edge of the first external terminal is greater than the distance between the edge of the first end of the coil portion farther from the center of the first end face and the edge of the first external terminal.

[0014] In another aspect of the coil component of the present invention, in a first direction of the first end face, an exposed area is formed between the outer edge of the first end face and the first external terminal, wherein the length of the exposed area is less than the distance between the edge of the first end of the coil portion on the side farther from the center of the first end face and the edge of the first external terminal.

[0015] In another aspect of the present invention, in the coil component, the first external terminal is composed of a resin electrode comprising resin and metal powder.

[0016] In another aspect of the present invention, a pair of coil portions each have a second end portion exposed on a second end face, and the second end portions of the pair of coil portions are located on both sides of the center position of the second end face in a second direction extending from the insulating substrate on the second end face. The coil portion further includes a pair of second external terminals disposed on the second end face, which are respectively connected to the second end portions of the pair of coil portions, and the pair of second external terminals are located on both sides of the center position of the second end face in a second direction. In the second direction of the second end face, the center position of the second end portion is offset from the center position side of the second end face compared to the center position side of the second external terminals.

[0017] Invention Effects

[0018] According to the present invention, a coil component capable of improving the fixation strength of external terminals can be provided. Attached Figure Description

[0019] Figure 1 This is a schematic perspective view of the coil component in the embodiment.

[0020] Figure 2 It means Figure 1 A diagram of the interior of the coil component.

[0021] Figure 3 yes Figure 2 An exploded view of the coil shown.

[0022] Figure 4 yes Figure 2 The diagram shows a cross-sectional view of the coil component along line IV-IV.

[0023] Figure 5 yes Figure 2 The diagram shows a VV-line cross-section of the coil component.

[0024] Figure 6 yes Figure 2 The diagram shows a plan view of the coil.

[0025] Figure 7 It means Figure 1 A diagram of one end face of the body of the coil component shown.

[0026] Figure 8 It means Figure 1 A diagram of the other end face of the body of the coil component shown. Detailed Implementation

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and repeated descriptions are omitted.

[0028] The coil component 1 in this embodiment, as an example, is a balun. The balun can be used, for example, when a near-field communication (NFC) circuit is integrated into a cellular terminal. By converting the unbalanced signal of the antenna to the balanced signal of the NFC circuit using the balun, a connection between the unbalanced and balanced circuits can be achieved. The coil component 1 can also be used as a common-mode filter or a transformer.

[0029] like Figure 1 As shown, the coil component 1 includes: a body 10; a coil structure 20 embedded in the body 10; and two pairs of external terminal electrodes 60A, 60B, 60C, and 60D disposed on the surface of the body 10.

[0030] The body 10 has a cuboid shape and six faces 10a to 10f. As an example, the body 10 is designed with a length of 2.0 mm, a short side of 1.25 mm, and a height of 0.65 mm. Among the faces 10a to 10f of the body 10, end face 10a (first end face) and end face 10b (second end face) are parallel to each other, upper surface 10c and lower surface 10d are parallel to each other, and side surface 10e and side surface 10f are parallel to each other. The upper surface 10c of the body 10 is parallel to the mounting surface of the mounting substrate for mounting the coil component 1.

[0031] The base material 10 is composed of a resin 12 containing metallic magnetic powder, which is a type of magnetic material. The resin 12 containing metallic magnetic powder is a binder powder obtained by bonding the metallic magnetic powder with an adhesive resin. The metallic magnetic powder in the resin 12 can be, for example, an iron-nickel alloy (permalloy), carbonyl iron, amorphous, amorphous, or crystalline FeSiCr alloys, iron-aluminum-silicon, etc. The adhesive resin is, for example, a thermosetting epoxy resin. In this embodiment, the content of metallic magnetic powder in the binder powder is 80–92 vol% by volume and 95–99 wt% by mass. From the viewpoint of magnetic properties, the content of metallic magnetic powder in the binder powder can also be 85–92 vol% by volume and 97–99 wt% by mass. The magnetic powder in the resin 12 containing metallic magnetic powder can be a powder having a single average particle size or a mixed powder having multiple average particle sizes.

[0032] The resin 12 containing metallic magnetic powder of the base body 10 integrally covers the coil structure 20 described later. Specifically, the resin 12 containing metallic magnetic powder covers the coil structure 20 from top to bottom and covers the outer periphery of the coil structure 20. In addition, the resin 12 containing metallic magnetic powder fills the inner periphery region of the coil structure 20.

[0033] The coil structure 20 includes: an insulating substrate 30; an upper coil structure 40A disposed on the upper side of the insulating substrate 30; and a lower coil structure 40B disposed on the lower side of the insulating substrate 30.

[0034] The insulating substrate 30 is designed to have a flat plate shape, extending between and orthogonal to the end faces 10a and 10b of the substrate 10. Furthermore, the insulating substrate 30 extends parallel to the upper surface 10c and lower surface 10d of the substrate 10. Figure 3 As shown, the insulating substrate 30 has: an elliptical coil forming portion 31 extending along the long side of the substrate 10; and a pair of frame portions 34A, 34B extending along the short side of the substrate 10 and sandwiching the coil forming portion 31 from both sides. An elliptical opening 32 extending along the long side of the substrate 10 is provided in the central portion of the coil forming portion 31.

[0035] The insulating substrate 30 is made of a non-magnetic insulating material. The thickness of the insulating substrate 30 can be designed to be, for example, in the range of 10 to 60 μm. In this embodiment, the insulating substrate 30 has a structure in which an epoxy resin is impregnated in glass cloth. The resin constituting the insulating substrate 30 is not limited to epoxy resin, but can also be BT resin, polyimide, aramid, etc. The constitutive material of the insulating substrate 30 can also be ceramic or glass. The constitutive material of the insulating substrate 30 can also be a mass-produced printed circuit board material. The constitutive material of the insulating substrate 30 can also be a resin material used in BT printed circuit boards, FR4 printed circuit boards, or FR5 printed circuit boards.

[0036] The upper coil structure 40A is provided on the upper surface 30a of the coil forming portion 31 of the insulating substrate 30. For example... Figure 2 , 3 As shown, the upper coil structure 40A includes a first planar coil 41, a second planar coil 42, and an upper insulator 50A. The first planar coil 41 and the second planar coil 42 are wound side by side and adjacent to each other on the upper surface 30a of the insulating substrate 30.

[0037] The first planar coil 41 is a generally oblong helical hollow coil wound on the upper surface 30a of the insulating substrate 30 and within the same layer around the opening 32 of the coil forming portion 31. The first planar coil 41 can have one or more turns. In this embodiment, the first planar coil 41 has 3 to 4 turns. The first planar coil 41 has an outer end portion 41a and an inner end portion 41b. The outer end portion 41a is provided in the frame portion 34A and protrudes from the end face 10a of the body 10. The inner end portion 41b is provided at the edge of the opening 32. On the insulating substrate 30, at a position overlapping with the inner end portion 41b of the first planar coil 41, a first through conductor 41c extending in the thickness direction of the insulating substrate 30 is provided. The first planar coil 41 is made of Cu, for example, and can be formed by electroplating.

[0038] Similar to the first planar coil 41, the second planar coil 42 is a generally oblong spiral hollow coil wound on the upper surface 30a of the insulating substrate 30 and within the same layer around the opening 32 of the coil forming portion 31. The second planar coil 42 is wound adjacent to the first planar coil 41 on the inner circumferential side. The second planar coil 42 can have one or more turns. In this embodiment, the number of turns of the second planar coil 42 is the same as that of the first planar coil 41. The second planar coil 42 has an outer end portion 42a and an inner end portion 42b. Similar to the outer end portion 41a of the first planar coil 41, the outer end portion 42a of the second planar coil 42 is provided in the frame portion 34A and protrudes from the end face 10a of the body 10. The inner end portion 42b of the second planar coil 42 is provided at the edge of the opening 32 and is adjacent to the inner end portion 41b of the first planar coil 41. On the insulating substrate 30, at a position overlapping with the inner end 42b of the second planar coil 42, a second through conductor 42c extending in the thickness direction of the insulating substrate 30 is provided. Similar to the first planar coil 41, the second planar coil 42 is made of Cu, for example, and can be formed by electroplating.

[0039] The upper insulator 50A is disposed on the upper surface 30a of the insulating substrate 30 and is a thick-film photoresist patterned using a known photolithography method. The upper insulator 50A defines the plating growth areas of the first planar coil 41 and the second planar coil 42. In this embodiment, as... Figure 4 As shown, the upper insulator 50A integrally covers the first planar coil 41 and the second planar coil 42, and more specifically, covers the sides and upper surfaces of the first planar coil 41 and the second planar coil 42. Figure 5 , 6 As shown, a portion of the upper insulator 50A extends from the interior of the body 10 through the space between the outer end 41a and the outer end 42a to the end face 10a of the body 10, and is exposed at the end face 10a. Additionally, as... Figure 5 , 6 As shown, a portion of the upper insulator 50A extends along the upper surface 30a of the substrate from the interior of the body 10 to the end face 10b, and is exposed at the end face 10b. The thickness of the upper insulator 50A is greater than the thickness of the first planar coil 41 and the second planar coil 42. The upper insulator 50A is, for example, made of epoxy resin.

[0040] The lower coil structure 40B is provided on the lower surface 30b of the coil forming portion 31 of the insulating substrate 30. For example... Figure 2 , 3As shown, the lower coil structure 40B includes a first planar coil 41, a second planar coil 42, and a lower insulator 50B. The first planar coil 41 and the second planar coil 42 are wound side-by-side and adjacent to each other on the lower surface 30b of the insulating substrate 30.

[0041] The first planar coil 41 and the second planar coil 42 of the lower coil structure 40B are symmetrical to the first planar coil 41 and the second planar coil 42 of the upper coil structure 40A. More specifically, the first planar coil 41 and the second planar coil 42 of the lower coil structure 40B have a shape that causes the first planar coil 41 and the second planar coil 42 of the upper coil structure 40A to flip about an axis parallel to the short side of the body 10.

[0042] The outer end 41a of the first planar coil 41 of the lower coil structure 40B is provided in the frame portion 34B and protrudes from the end face 10b of the body 10. The inner end 41b of the first planar coil 41 of the lower coil structure 40B overlaps with the first through conductor 41c provided in the insulating substrate 30. Therefore, the inner end 41b of the first planar coil 41 of the lower coil structure 40B is electrically connected to the inner end 41b of the first planar coil 41 of the upper coil structure 40A via the first through conductor 41c. The first planar coil 41 of the lower coil structure 40B is made of Cu, for example, and can be formed by electroplating.

[0043] The outer end 42a of the second planar coil 42 of the lower coil structure 40B is provided in the frame portion 34B and protrudes from the end face 10b of the body 10. The inner end 42b of the second planar coil 42 of the lower coil structure 40B overlaps with the second through conductor 42c provided in the insulating substrate 30. Therefore, the inner end 42b of the second planar coil 42 of the lower coil structure 40B is electrically connected to the inner end 42b of the second planar coil 42 of the upper coil structure 40A via the second through conductor 42c. The second planar coil 42 of the lower coil structure 40B is made of Cu, for example, and can be formed by electroplating.

[0044] The lower insulator 50B is disposed on the lower surface 30b of the insulating substrate 30 and is a thick-film resist patterned using a known photolithography method. Similar to the upper insulator 50A, the lower insulator 50B defines the plating growth areas for the first planar coil 41 and the second planar coil 42. In this embodiment, as... Figure 4As shown, the lower insulator 50B integrally covers the first planar coil 41 and the second planar coil 42, and more specifically, covers the sides and top surfaces of the first planar coil 41 and the second planar coil 42. Similar to the upper insulator 50A, a portion of the lower insulator 50B extends from the interior of the substrate 10 through the space between the outer end 41a and the outer end 42a to the end face 10b of the substrate 10, and is exposed at the end face 10b. Additionally, a portion of the lower insulator 50B extends along the lower surface 30b of the substrate from the interior of the substrate 10 to the end face 10a, and is exposed at the end face 10a. The thickness of the lower insulator 50B is greater than the thickness of the first planar coil 41 and the second planar coil 42. The thickness of the lower insulator 50B can be the same as the thickness of the upper insulator 50A. The lower insulator 50B is, for example, made of epoxy resin.

[0045] The substrate 10 includes a pair of coil portions C1 and C2 forming a double-layer coil structure. The first coil portion C1 consists of a first planar coil 41 of an upper coil structure 40A disposed on the upper surface 30a of the insulating substrate 30, a first planar coil 41 of a lower coil structure 40B disposed on the lower surface 30b of the insulating substrate 30, and a first through conductor 41c connecting the two first planar coils 41 to each other. In the first coil portion C1, the outer end 41a of the first planar coil 41 of the upper coil structure 40A constitutes a first end, and the outer end 41a of the first planar coil 41 of the lower coil structure 40B constitutes a second end. The second coil portion C2 consists of a second planar coil 42 of the upper coil structure 40A disposed on the upper surface 30a of the insulating substrate 30, a second planar coil 42 of the lower coil structure 40B disposed on the lower surface 30b of the insulating substrate 30, and a second through conductor 42c connecting the two second planar coils 42 to each other. In the second coil section C2, the outer end 42a of the second planar coil 42 of the upper coil structure 40A constitutes the first end, and the outer end 42a of the second planar coil 42 of the lower coil structure 40B constitutes the second end.

[0046] Two pairs of external terminal electrodes 60A, 60B, 60C, and 60D are each provided on the parallel end faces 10a and 10b of the body 10.

[0047] A pair of external terminal electrodes 60A and 60B (first external terminals) are disposed on end face 10a. External terminal electrode 60A is connected to the outer end 41a of the first planar coil 41 of the upper coil structure 40A, and external terminal electrode 60B is connected to the outer end 42a of the second planar coil 42 of the upper coil structure 40A. Figure 7As shown, when viewed from the end face 10a side, the external terminal electrode 60A is offset from the side face 10f side, covering the vicinity of the side face 10f of the end face 10a. Additionally, the external terminal electrode 60B is offset from the side face 10e side, covering the vicinity of the side face 10e of the end face 10a. When viewed from the end face 10a side, the external terminal electrode 60A and the external terminal electrode 60B are spaced apart by a predetermined uniform width d.

[0048] A pair of external terminal electrodes 60C and 60D (second external terminals) are disposed on end face 10b. External terminal electrode 60C is connected to the outer end 41a of the first planar coil 41 of the lower coil structure 40B, and external terminal electrode 60D is connected to the outer end 42a of the second planar coil 42 of the lower coil structure 40B. External terminal electrode 60C is biased against the side 10f side, covering the vicinity of the side 10f of end face 10b. External terminal electrode 60D is biased against the side 10e side, covering the vicinity of the side 10e of end face 10b. When viewed from end face 10b, external terminal electrode 60C and external terminal electrode 60D are spaced apart by a predetermined uniform width d.

[0049] External terminal electrode 60A of end face 10a and external terminal electrode 60C of end face 10b are disposed at corresponding positions along the long side of the body 10. Similarly, external terminal electrode 60B of end face 10a and external terminal electrode 60D of end face 10b are disposed at corresponding positions along the long side of the body 10.

[0050] External terminal electrodes 60A, 60B, 60C, and 60D are all bent into an L-shape, continuously covering end faces 10a and 10b and the upper surface 10c. In this embodiment, external terminal electrodes 60A, 60B, 60C, and 60D are made of resin electrodes, for example, of resin containing Ag powder.

[0051] Next, refer to Figure 7 , 8 The structure of the end faces 10a and 10b of the base body 10 is explained.

[0052] like Figure 7 As shown, the end face 10a of the body 10 has a direction extending in the insulating substrate 30 (first direction). Figure 7 A rectangular shape extending along the X1 direction (in the first direction). The end face 10a of the body 10 extends in a direction orthogonal to the first direction X1 (in the first direction X1). Figure 7 The width in the Z direction (as shown) is W1. In this embodiment, the width W1 is 1.25mm.

[0053] On the end face 10a of the substrate 10, the outer ends 41a of the first planar coil 41 and the outer ends 42a of the second planar coil 42 are arranged along the first direction X1 on the upper surface 30a of the insulating substrate 30, and are located on both sides of the center position P of the end face 10a in the first direction X1. In this embodiment, the outer ends 41a of the first planar coil 41 and the outer ends 42a of the second planar coil 42 both have an exposed rectangular shape extending in the first direction X1. The width (i.e., the length in the X1 direction) W2 of the outer ends 41a and 42a on the end face 10a is uniform in the Z direction, and for example, is 0.25 mm. On the end face 10a of the substrate 10, the outer ends 41a of the first planar coil 41 and the outer ends 42a of the second planar coil 42 can be symmetrical about the center position P of the end face 10a.

[0054] A pair of external terminal electrodes 60A and 60B are located on either side of the center position P of the end face 10a of the body 10 in the first direction X1. In this embodiment, when viewed from the end face 10a side, both external terminal electrodes 60A and 60B are quadrilateral in shape. When viewed from the end face 10a side, the width W3 of the external terminal electrodes 60A and 60B in the Z direction is uniform, for example, 0.5 mm. When viewed from the end face 10a of the body 10, the pair of external terminal electrodes 60A and 60B can be symmetrical about the center position P of the end face 10a.

[0055] Furthermore, on the end face 10a of the substrate 10, the center position Q of the external terminal electrodes 60A and 60B in the first direction X1 is offset from the center position R of the outer ends 41a and 42a to the center position P of the end face 10a. In this embodiment, the center position Q of the external terminal electrodes 60A and 60B is offset by 0.03 mm from the center position R of the outer ends 41a and 42a towards the center position P of the end face 10a. In the coil component 1, compared with the structure where the center positions Q of the external terminal electrodes 60A and 60B are aligned with the center positions R of the outer ends 41a and 42a, the external terminal electrodes 60A and 60B can be formed closer to the center position P of the end face 10a. That is, the bonding area between the external terminal electrodes 60A and 60B and the substrate 10 can be increased on the center position P side of the end face 10a. As a result, the adhesion strength between the external terminal electrodes 60A and 60B and the body 10 can be improved in the coil component 1.

[0056] In this embodiment, the distance d1 between the edge E1 of the outer end portion 41a, 42a closer to the center position P of the end face 10a and the edge E3 of the external terminal electrode 60A, 60B is greater than the distance d2 between the edge E2 of the outer end portion 41a, 42a farther from the center position P of the end face 10a and the edge E4 of the external terminal electrode 60A, 60B (d1 > d2).

[0057] Furthermore, in this embodiment, on the first direction X1 of the end face 10a, between the outer edge E5 of the end face 10a and the external terminal electrodes 60A and 60B, an exposed area 11 is formed whereby the end face 10a exposes from the external terminal electrodes 60A and 60B. The length d3 of the exposed area 11 on the first direction X1 is designed to be less than the distance d2 (d3 < d2) between the edge E2 of the outer end portion 41a and 42a on the side farther from the center position P of the end face 10a and the edge E4 of the external terminal electrodes 60A and 60B. Figure 7 As shown, the external terminal electrodes 60A and 60B do not wrap around from the end face 10a to the sides 10e and 10f. Alternatively, in the first direction X1 of the end face 10a, the outer edge E5 of the end face 10a coincides with the edge E4 of the external terminal electrodes 60A and 60B, without forming an exposed area 11 (i.e., d3 = 0), and the external terminal electrodes 60A and 60B do not wrap around from the end face 10a to the sides 10e and 10f.

[0058] like Figure 8 As shown, the end face 10a of the body 10 has a direction extending in the insulating substrate 30 (second direction). Figure 8 A rectangular shape extending in the X2 direction (of the image). The shape and dimensions of end face 10b are similar to... Figure 7 The end face 10a shown is the same or identical.

[0059] On the end face 10b of the substrate 10, the outer ends 41a of the first planar coil 41 and the outer ends 42a of the second planar coil 42 are arranged along the second direction X2 on the lower surface 30b of the insulating substrate 30, and are located on both sides of the center position P of the end face 10b in the second direction X2. In this embodiment, the outer ends 41a of the first planar coil 41 and the outer ends 42a of the second planar coil 42 both have an exposed rectangular shape extending in the second direction X2. The shape and size of the outer ends 41a and 42a on the end face 10b are similar to those of the first planar coil 41 and the second planar coil 42. Figure 7 The outer ends 41a and 42a on the end face 10a shown are the same or identical.

[0060] A pair of external terminal electrodes 60C and 60D are located on either side of the center position P of the end face 10b in the second direction X2 on the end face 10b of the body 10. In this embodiment, when viewed from the end face 10b side, both external terminal electrodes 60C and 60D have a quadrilateral shape. The shape and size of the external terminal electrodes 60C and 60D viewed from the end face 10b side are similar to those viewed from the end face 10b side. Figure 7 The external terminal electrodes 60A and 60B shown are the same or identical when viewed from the end face 10a side.

[0061] Furthermore, on the end face 10b of the substrate 10, the center position Q of the external terminal electrodes 60C and 60D in the second direction X2 is offset from the center position R of the outer ends 41a and 42a to the center position P of the end face 10b. In this embodiment, the center position Q of the external terminal electrodes 60C and 60D is offset by 0.03 mm relative to the center position R of the outer ends 41a and 42a towards the center position P of the end face 10b. In the coil component 1, compared to the structure where the center positions Q of the external terminal electrodes 60C and 60D are aligned with the center positions R of the outer ends 41a and 42a, the external terminal electrodes 60C and 60D can be formed closer to the center position P of the end face 10b. That is, the bonding area between the external terminal electrodes 60C and 60D and the substrate 10 can be increased on the center position P side of the end face 10b. As a result, the adhesion strength between the external terminal electrodes 60C, 60D and the body 10 can be improved in the coil component 1.

[0062] In this embodiment, the distance d1 between the edge E1 of the outer end portion 41a, 42a on the side closer to the center position P of the end face 10b and the edge E3 of the external terminal electrode 60C, 60D is greater than the distance d2 between the edge E2 of the outer end portion 41a, 42a on the side farther from the center position P of the end face 10b and the edge E4 of the external terminal electrode 60C, 60D (d1 > d2).

[0063] Furthermore, in this embodiment, on the second direction X2 of the end face 10b, between the outer edge E5 of the end face 10b and the external terminal electrodes 60C and 60D, an exposed area 11 is formed whereby the end face 10b exposes from the external terminal electrodes 60C and 60D. The length d3 of the exposed area 11 on the second direction X2 is designed to be less than the distance d2 between the edge E2 of the outer end portion 41a and 42a on the side farther from the center position P of the end face 10b and the edge E4 of the external terminal electrodes 60C and 60D (d3 < d2). Figure 8As shown, the external terminal electrodes 60C and 60D do not wrap around from the end face 10b to the sides 10e and 10f. Alternatively, in the second direction X2 of the end face 10b, the outer edge E5 of the end face 10b coincides with the edge E4 of the external terminal electrodes 60C and 60D, without forming an exposed area 11 (i.e., d3 = 0), and the external terminal electrodes 60C and 60D do not wrap around from the end face 10b to the sides 10e and 10f.

[0064] Furthermore, the present invention is not limited to the embodiments described above, and can be implemented in various ways.

[0065] For example, the number of turns in the first coil section and the number of turns in the second coil section can be increased or decreased appropriately. Alternatively, the coil section body can contain more than three coil sections.

Claims

1. A coil component, characterized in that, include: The body is made of resin containing metallic magnetic powder and has a first end face and a second end face that are parallel to each other. An insulating substrate disposed within the body extends between the first end face and the second end face, and is exposed on the first end face and the second end face, and is orthogonal to the first end face and the second end face. A pair of coil portions disposed on the insulating substrate, each having a first end exposed on the first end face, wherein the first ends of the pair of coil portions are located on either side of the center position of the first end face in a first direction extending from the insulating substrate on the first end face; and A pair of first external terminals are disposed on the first end face, which are respectively connected to the first ends of the pair of coil portions, and the pair of first external terminals are located on both sides of the center position of the first end face in the first direction. In the first direction of the first end face, the center position of the first external terminal is offset from the center position side of the first end face compared to the center position of the first end face. In the first direction of the first end face, an exposed area is formed between the outer edge of the first end face and the first external terminal, whereby the first end face protrudes from the first external terminal. The length of this exposed area is less than the distance between the edge of the first end of the coil portion on the side farther from the center of the first end face and the edge of the first external terminal. The first end face has a rectangle extending along the first direction. In the first direction of the first end face, the edge of the first external terminal on the side farther from the center of the first end face is located on the side farther from the center of the first end face compared to the edge of the first end of the coil portion.

2. The coil component according to claim 1, characterized in that: The first end face has a rectangular shape extending in the first direction. In the first direction of the first end face, the distance between the edge of the first end of the coil portion closer to the center of the first end face and the edge of the first external terminal is greater than the distance between the edge of the first end of the coil portion farther from the center of the first end face and the edge of the first external terminal.

3. The coil component according to claim 1 or 2, characterized in that: The first external terminal is composed of a resin electrode containing resin and metal powder.

4. The coil component according to claim 1 or 2, characterized in that: The pair of coil portions each have a second end portion exposed on the second end face, and the second end portions of the pair of coil portions are located on both sides of the center position of the second end face in the second direction extending from the insulating substrate on the second end face. The coil component further includes a pair of second external terminals disposed on the second end face, which are respectively connected to the second ends of the pair of coil portions, and the pair of second external terminals are located on both sides of the center position of the second end face in the second direction. In the second direction of the second end face, the center position of the second external terminal is offset from the center position side of the second end face compared to the center position of the second end face.

5. The coil component according to claim 3, characterized in that: The pair of coil portions each have a second end portion exposed on the second end face, and the second end portions of the pair of coil portions are located on both sides of the center position of the second end face in the second direction extending from the insulating substrate on the second end face. The coil component further includes a pair of second external terminals disposed on the second end face, which are respectively connected to the second ends of the pair of coil portions, and the pair of second external terminals are located on both sides of the center position of the second end face in the second direction. In the second direction of the second end face, the center position of the second external terminal is offset from the center position side of the second end face compared to the center position of the second end face.

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