Coil component

Abstract

The coil member includes: a body having a main surface and first and second side surfaces opposite each other in a direction along the main surface; a coil disposed in the body and having a coil axis orthogonal to the main surface; and an external electrode disposed at least on the first side surface, the body having a first body region between the first side surface and the coil in the direction and a second body region between the second side surface and the coil in the direction, the first body region having a higher resistivity than the second body region.

Description

Technical Field

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

[0002] A coil component is known, comprising a body, a coil disposed within the body, and external electrodes disposed within the body (for example, see Japanese Patent Application Laid-Open No. 2021-108332). In this coil component, the body has a main surface and first and second side surfaces that are opposite to each other in the direction along the main surface. The coil has a coil axis orthogonal to the main surface. The distance between the coil and the first side surface is less than the distance between the coil and the second side surface. Summary of the Invention

[0003] In the above-mentioned coil component, since the distance between the coil and the first side is short, a short circuit may occur between the coil and the external electrode disposed on the first side.

[0004] The purpose of this disclosure is to provide a coil component capable of suppressing the occurrence of short circuits.

[0005] (1) A coil component according to one aspect of the present disclosure comprises: a body having a main surface and a first side surface and a second side surface opposite to each other in a direction along the main surface; a coil disposed in the body having a coil axis orthogonal to the main surface; and an external electrode disposed at least on the first side surface, the body having: a first body region located between the first side surface and the coil in the direction; and a second body region located between the second side surface and the coil in the direction, the resistivity of the first body region being higher than the resistivity of the second body region.

[0006] In the coil component described above, a first body region with high resistivity is located between the first side where the external electrode is disposed and the coil. Therefore, it is possible to suppress short circuits between the coil and the external electrode disposed on the first side.

[0007] (2) In the coil component described in (1) above, the substrate may have a plurality of metallic magnetic particles and resin present between the plurality of metallic magnetic particles, wherein the proportion of gaps between the plurality of metallic magnetic particles without the resin in the first substrate region is less than the proportion of such gaps in the second substrate region. In this case, the resistivity of the first substrate region can be made higher than the resistivity of the second substrate region.

[0008] (3) In the coil component of (1) or (2) above, the substrate may have a plurality of metallic magnetic particles and resin present between the plurality of metallic magnetic particles, wherein the proportion of the resin in the first substrate region is greater than the proportion of the resin in the second substrate region. In this case, the resistivity of the first substrate region can be made higher than the resistivity of the second substrate region.

[0009] (4) In any of the coil components described in (1) to (3) above, the body may also have: a plurality of metallic magnetic particles; an insulating film covering the surface of the plurality of metallic magnetic particles; and a resin present between the plurality of metallic magnetic particles, wherein the insulating film occupies a larger proportion in the first body region than in the second body region. In this case, the resistivity of the first body region can be made higher than that of the second body region.

[0010] (5) In the coil component described in (4) above, the average particle size of the plurality of metallic magnetic particles in the first body region may be smaller than the average particle size of the plurality of metallic magnetic particles in the second body region. In this case, the proportion of the insulating coating in the first body region can be greater than the proportion of the insulating coating in the second body region. As a result, the resistivity of the first body region can be higher than the resistivity of the second body region.

[0011] (6) In any of the coil components described in (1) to (5) above, the first body region may be shorter than the second body region in the stated direction. In this case, a structure that increases the resistivity of the first body region is more effective in suppressing short circuits.

[0012] (7) In any of the coil components described in (1) to (6) above, the coil may have a first coil region adjacent to the first body region and a second coil region adjacent to the second body region, wherein the number of turns of the coil in the first coil region is less than the number of turns of the coil in the second coil region. In this case, even if the coil is positioned closer to the first side than the second side in order to adjust the difference in leakage flux caused by the difference in the number of turns of the first coil region and the second coil region, the occurrence of short circuits can be suppressed due to the high resistivity of the first body region.

[0013] (8) In any of the coil components described in (1) to (7) above, the coil may have a first coil region adjacent to the first body region and a second coil region adjacent to the second body region, wherein the area of ​​contact between the coil and the first body region is greater than the area of ​​contact between the coil and the second body region. In this case, a structure that increases the resistivity of the first body region is more effective in suppressing short circuits.

[0014] (9) In any of the coil components described in (1) to (8) above, the first body region may have the same length as the body in a direction orthogonal to the direction and the coil axis. In this case, the occurrence of short circuits can be further suppressed.

[0015] (10) In any of the coil components described in (1) to (9) above, the body may further have a third side adjacent to the main surface, the first side surface, and the second side surface, respectively; the external electrode has a first electrode portion disposed on the first side surface and a second electrode portion disposed on the third side surface; and the first body region has a first region portion located between the first side surface and the coil and a second region portion located between the third side surface and the coil. In this case, the first region portion of the first body region with high resistivity is located between the first side surface of the external electrode where the first electrode portion is disposed and the coil. Therefore, short circuits between the coil and the first side surface can be suppressed. Furthermore, the second region portion of the first body region with high resistivity is located between the third side surface of the external electrode where the second electrode portion is disposed and the coil. Therefore, short circuits between the coil and the third side surface can be suppressed. Attached Figure Description

[0016] Figure 1 This is a perspective view of the coil component according to the first embodiment.

[0017] Figure 2 It means Figure 1 The diagram shows the cross-sectional structure of the coil component.

[0018] Figure 3 This is a schematic cross-sectional view of the solid body.

[0019] Figure 4 It means Figure 1 The diagram shows the layer structure of the coil component.

[0020] Figure 5 yes Figure 1 A top view of the coil component shown.

[0021] Figure 6 This is a diagram showing the layer structure of the coil component in the second embodiment.

[0022] Figure 7 It is a diagram showing the connection relationship of the conductor pattern layers.

[0023] Figure 8 This is a diagram showing the layer structure of the coil component in the third embodiment.

[0024] Figure 9 This is a top view of the coil conductor.

[0025] Figure 10 yes Figure 8 A top view of the coil component shown.

[0026] Figure 11 This is a top view of the coil component according to the fourth embodiment.

[0027] Figure 12 This is a top view of the coil component according to the fifth embodiment.

[0028] Figure 13 This is a top view of the coil component according to the sixth embodiment.

[0029] Figure 14 This is a top view of the coil component according to the seventh embodiment.

[0030] Figure 15 This is a top view of the coil component according to the eighth embodiment. Detailed Implementation

[0031] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Furthermore, in the description of the drawings, the same or equivalent elements are labeled with the same reference numerals, and repeated descriptions are omitted.

[0032] (First Embodiment)

[0033] Reference Figures 1-5 The coil component 1 of the first embodiment will be described below. Figure 1 and Figure 2 As shown, the coil component 1 includes a body 2, a coil 3, external electrodes 4 and 5, a connecting conductor 51, and a connecting conductor 52. The coil 3, connecting conductor 51, and connecting conductor 52 are internal conductors disposed within the body 2. The coil component 1 is a stacked coil component, formed by stacking multiple magnetic body layers 11. The coil component 1 can be applied, for example, to a bead inductor or a power inductor. The external electrodes 4 and 5 are respectively disposed at both ends of the body 2.

[0034] Substrate 2 is rectangular in shape. The rectangular shape includes a rectangular shape with chamfered corners and edges, and a rectangular shape with rounded corners and edges. Substrate 2 has opposing end faces 2a and 2b, a pair of main faces 2c and 2d, and a pair of side faces 2e and 2f.

[0035] End faces 2a and 2b are opposite to each other in the first direction D1. Main faces 2c and 2d are opposite to each other in the second direction D2. Side faces 2e and 2f are opposite to each other in the third direction D3. The first direction D1, the second direction D2, and the third direction D3 intersect each other (orthogonal in this embodiment). Main face 2d is, for example, the face opposite to the electronic device when mounting the coil component 1 (not shown) to the electronic device. The electronic device includes, for example, a circuit board or electronic components. In this embodiment, main face 2d is a mounting surface. End face 2b is adjacent to main face 2d, side face 2e, and side face 2f, respectively.

[0036] End faces 2a and 2b and side faces 2e and 2f are adjacent to the main face 2d. The first direction D1 and the third direction D3 are directions along the main face 2d. The second direction D2 is the direction that intersects (or is orthogonal to) the main face 2d.

[0037] The base body 2 is constructed by stacking multiple magnetic layers 11. Each magnetic layer 11 is stacked in the second direction D2. The base body 2 has multiple stacked magnetic layers 11. In the actual base body 2, the multiple magnetic layers 11 are integrated to such an extent that the boundaries between the layers are not visually discernible.

[0038] like Figure 3 As shown, the magnetic layer 11 comprises a plurality of metallic magnetic particles 6. The metallic magnetic particles 6 are, for example, composed of a soft magnetic alloy. The soft magnetic alloy is, for example, an Fe-Si based alloy. In the case of an Fe-Si based alloy, the soft magnetic alloy may contain P. The soft magnetic alloy may, for example, be an Fe-Ni-Si-M based alloy. "M" contains one or more elements selected from Co, Cr, Mn, P, Ti, Zr, Hf, Nb, Ta, Mo, Mg, Ca, Sr, Ba, Zn, B, Al, and rare earth elements.

[0039] The average particle size of the metallic magnetic particles 6 in the entire substrate 2 is 0.5 μm to 15 μm. In this embodiment, the average particle size of the metallic magnetic particles 6 in the entire substrate 2 is 5 μm. The "average particle size" is calculated, for example, from at least one cross-section of the substrate 2. In one example, it refers to the particle size at which the cumulative value in the particle size distribution obtained by image processing of an image of at least one cross-section of the substrate 2 is 50%. The "average particle size" may also refer to the particle size at which the cumulative value in the particle size distribution obtained by laser diffraction / scattering is 50%.

[0040] The magnetic layer 11 includes an insulating film 7 covering the surfaces of a plurality of metallic magnetic particles 6. The insulating film 7 has higher electrical insulation properties than the metallic magnetic particles 6. In the magnetic layer 11, the metallic magnetic particles 6 are bonded together by the bonding of the insulating films 7 formed on the surfaces of the metallic magnetic particles 6. In the magnetic layer 11, the metallic magnetic particles 6 are electrically insulated from each other by the bonding of the insulating films 7. The thickness of the insulating film 7 is, for example, 5 nm to 60 nm. The insulating film 7 may also be composed of one or more layers. When the insulating film 7 is composed of multiple layers, the thickness of each layer may be the same or different. The insulating film 7 is, for example, an oxide film. The oxide film may, for example, contain oxides containing at least one of Cr and Al, or oxides containing at least one of Fe, Cr, and Al as the main components.

[0041] The base body 2 contains resin 8. Resin 8 is present between multiple metallic magnetic particles 6. Resin 8 is an electrically insulating resin (insulating resin). Insulating resins include, for example, silicone resin, phenolic resin, acrylic resin, or epoxy resin.

[0042] like Figure 1 and Figure 2 As shown, external electrodes 4 and 5 are disposed at both ends of the substrate 2 in the first direction D1. External electrodes 4 and 5 are separated from each other in the first direction D1. External electrode 4 is disposed at the end of the substrate 2 on the end face 2a side. External electrode 5 is disposed at the end of the substrate 2 on the end face 2b side. External electrodes 4 and 5 contain a conductive material. The conductive material is, for example, Ag or Pd. External electrodes 4 and 5 are configured as a sintered body of conductive paste. The conductive paste contains conductive metal powder and glass frit. The conductive metal powder is, for example, Ag powder or Pd powder. A plating layer is formed on the surface of external electrodes 4 and 5. The plating layer is formed, for example, by electroplating. The electroplating is, for example, Ni electroplating or Sn electroplating.

[0043] External electrode 4 is disposed on end face 2a, main face 2c, main face 2d, side face 2e, and side face 2f. External electrode 4 comprises five electrode portions. External electrode 4 includes electrode portion 4a located on end face 2a, electrode portion 4b located on main face 2d, electrode portion 4c located on main face 2c, electrode portion 4d located on side face 2e, and electrode portion 4e located on side face 2f. Electrode portion 4a covers the entire surface of end face 2a. Electrode portion 4b covers a portion of main face 2d. Electrode portion 4c covers a portion of main face 2c. Electrode portion 4d covers a portion of side face 2e. Electrode portion 4e covers a portion of side face 2f. The five electrode portions 4a, 4b, 4c, 4d, and 4e are integrally formed.

[0044] External electrodes 5 are disposed on end face 2b, main face 2c, main face 2d, side face 2e, and side face 2f. External electrode 5 comprises five electrode portions. External electrode 5 includes electrode portion 5a located on end face 2b, electrode portion 5b located on main face 2d, electrode portion 5c located on main face 2c, electrode portion 5d located on side face 2e, and electrode portion 5e located on side face 2f. Electrode portion 5a covers the entire surface of end face 2b. Electrode portion 5b covers a portion of main face 2d. Electrode portion 5c covers a portion of main face 2c. Electrode portion 5d covers a portion of side face 2e. Electrode portion 5e covers a portion of side face 2f. The five electrode portions 5a, 5b, 5c, 5d, and 5e are integrally formed.

[0045] like Figure 2 , Figure 4 and Figure 5 As shown, coil 3 is disposed within body 2. Although in Figure 4 The details are omitted, but a magnetic layer 11 with a main surface 2c is disposed on the coil conductor 53, and the coil 3 is not exposed on the outer surface of the body 2. The coil 3 has a main surface 2c and a coil axis Ax orthogonal to the main surface 2d. The coil axis Ax extends along the second direction D2. The coil 3 includes a plurality of coil conductors 53 to 58. The plurality of coil conductors 53 to 58 contain a conductive material (e.g., Ag or Pd). The plurality of coil conductors 53 to 58 are configured as a sintered body containing a conductive paste containing a conductive material (e.g., Ag powder or Pd powder).

[0046] Multiple coil conductors 53-58 are arranged within the body 2 along the stacking direction of the magnetic layer 11. The coil conductors 53-58 are arranged in the order of coil conductor 53, coil conductor 54, coil conductor 55, coil conductor 56, coil conductor 57, and coil conductor 58. Coil conductor 53 is positioned closer to the main surface 2c. Coil conductor 58 is positioned closer to the main surface 2d.

[0047] The ends of coil conductors 53-58 are connected to each other via through-hole conductors 59a-59e. The coil conductors 53-58 are electrically connected to each other via through-hole conductors 59a-59e. The coil 3 is constructed by electrically connecting multiple coil conductors 53-58. Each through-hole conductor 59a-59e contains a conductive material (e.g., Ag or Pd). Like the multiple coil conductors 53-58, each through-hole conductor 59a-59e is constructed as a sintered body of a conductive paste containing a conductive material (e.g., Ag powder or Pd powder).

[0048] The coil conductor 53 is connected to the connecting conductor 51. The connecting conductor 51 is disposed on the end face 2a side of the body 2 and has an end exposed on the end face 2a. The end of the connecting conductor 51 is exposed in the end face 2a near the main face 2c and is connected to the electrode portion 4a of the external electrode 4. That is, the coil 3 is electrically connected to the external electrode 4 via the connecting conductor 51. In this embodiment, the conductor pattern of the coil conductor 53 and the conductor pattern of the connecting conductor 51 are integrally and continuously formed.

[0049] The coil conductor 53 has a first portion 53a extending along a first direction D1 on the side 2f, a second portion 53b extending along a third direction D3 on the end face 2b, and a third portion 53c extending along the first direction D1 on the side 2e. One end of the first portion 53a is connected to the connecting conductor 51. The other end of the first portion 53a is connected to one end of the second portion 53b. The other end of the second portion 53b is connected to one end of the third portion 53c. The other end of the third portion 53c is connected to the pad portion 53d disposed at the center of the magnetic layer 11 in the first direction D1.

[0050] The coil conductor 54 has a first portion 54a extending along a first direction D1 on the side surface 2e, a second portion 54b extending along a third direction D3 on the end face 2a, and a third portion 54c extending along the first direction D1 on the side surface 2f. One end of the first portion 54a is connected to a pad portion 54d disposed at the center of the magnetic layer 11 in the first direction D1. The pad portion 54d is disposed at a position overlapping the pad portion 53d in the stacking direction and is connected to the pad portion 53d through a through-hole conductor 59a. The other end of the first portion 54a is connected to one end of the second portion 54b. The other end of the second portion 54b is connected to one end of the third portion 54c. The other end of the third portion 54c is connected to the pad portion 54e disposed near the end face 2b.

[0051] The coil conductor 55 has a first portion 55a extending along the third direction D3 on the end face 2b side, a second portion 55b extending along the first direction D1 on the side surface 2e side, a third portion 55c extending along the third direction D3 on the end face 2a side, and a fourth portion 55d extending along the first direction D1 on the side surface 2f side. One end of the first portion 55a is connected to a pad portion 55e located near the end face 2b. The pad portion 55e is located at a position overlapping the pad portion 54e in the stacking direction and is connected to the pad portion 54e through a through-hole conductor 59b. The other end of the first portion 55a is connected to one end of the second portion 55b. The other end of the second portion 55b is connected to one end of the third portion 55c. The other end of the third portion 55c is connected to one end of the fourth portion 55d. The other end of the fourth portion 55d is connected to a pad portion 55f located at the center of the magnetic layer 11 in the first direction D1.

[0052] The coil conductor 56 has a first portion 56a extending along a first direction D1 on the side surface 2f, a second portion 56b extending along a third direction D3 on the end face 2b, and a third portion 56c extending along the first direction D1 on the side surface 2e. One end of the first portion 56a is connected to a pad portion 56d disposed at the center of the magnetic layer 11 in the first direction D1. The pad portion 56d is disposed at a position overlapping the pad portion 55f in the stacking direction and is connected to the pad portion 55f through a through-hole conductor 59c. The other end of the first portion 56a is connected to one end of the second portion 56b. The other end of the second portion 56b is connected to one end of the third portion 56c. The other end of the third portion 56c is connected to a pad portion 56e disposed near the end face 2a.

[0053] The coil conductor 57 has a first portion 57a ​​extending along the third direction D3 on the end face 2a side, a second portion 57b extending along the first direction D1 on the side surface 2f side, a third portion 57c extending along the third direction D3 on the end face 2b side, and a fourth portion 57d extending along the first direction D1 on the side surface 2e side. One end of the first portion 57a ​​is connected to a pad portion 57e located near the end face 2a. The pad portion 57e is located at a position overlapping the pad portion 56e in the stacking direction and is connected to the pad portion 56e through a through-hole conductor 59d. The other end of the first portion 57a ​​is connected to one end of the second portion 57b. The other end of the second portion 57b is connected to one end of the third portion 57c. The other end of the third portion 57c is connected to one end of the fourth portion 57d. The other end of the fourth portion 57d is connected to a pad portion 57f located at the center of the magnetic layer 11 in the first direction D1.

[0054] The coil conductor 58 has a first portion 58a extending along a first direction D1 on the side surface 2e, a second portion 58b extending along a third direction D3 on the end face 2a, and a third portion 58c extending along the first direction D1 on the side surface 2f. One end of the first portion 58a is connected to a pad portion 58d disposed at the center of the magnetic layer 11 in the first direction D1. The pad portion 58d is disposed at a position overlapping the pad portion 57f in the stacking direction and is connected to the pad portion 57f through a through-hole conductor 59e. The other end of the first portion 58a is connected to one end of the second portion 58b. The other end of the second portion 58b is connected to one end of the third portion 58c. The other end of the third portion 58c is connected to a connecting conductor 52.

[0055] The coil conductor 58 is connected to the connecting conductor 52. The connecting conductor 52 is disposed on the end face 2b side of the body 2 and has an end exposed on the end face 2b. The end of the connecting conductor 52 is exposed in the end face 2b near the main face 2d and is connected to the electrode portion 5a of the external electrode 5. That is, the coil 3 is electrically connected to the external electrode 5 via the connecting conductor 52. In this embodiment, the conductor pattern of the coil conductor 58 and the conductor pattern of the connecting conductor 52 are integrally and continuously formed. In the first direction D1, the connecting conductor 51 and the connecting conductor 52 have the same length.

[0056] Figure 5 yes Figure 1 The diagram shows a top view of the coil assembly. The coil assembly 1 is shown as viewed from the main surface 2c. Electrode portions 4c and 5c are omitted to represent the body 2. Internal conductors are indicated by dashed lines. As shown, the coil 3 is offset towards the side surface 2e in the third direction D3. That is, the coil 3 is positioned closer to the side surface 2e than the side surface 2f. The distance between the coil 3 in the third direction D3 and the side surface 2e (the length of the body region R21 in the third direction D3) is shorter than the distance between the coil 3 in the third direction D3 and the side surface 2f (the length of the body region R22 in the third direction D3). The coil 3 is positioned approximately equidistant from end faces 2a and 2b.

[0057] Coil 3 has coil region R31 and coil region R32. Coil region R31 is a region that is opposite to side 2e in the third direction D3 and extends along the first direction D1 at a position closer to side 2e than the coil axis Ax. Coil region R31 includes the third portion 53c of coil conductor 53, the first portion 54a of coil conductor 54, the second portion 55b of coil conductor 55, the third portion 56c of coil conductor 56, the fourth portion 57d of coil conductor 57, and the first portion 58a of coil conductor 58. Coil region R32 is a region that is opposite to side 2f in the third direction D3 and extends along the first direction D1 at a position closer to side 2f than the coil axis Ax. Coil region R32 includes the first portion 53a of coil conductor 53, the third portion 54c of coil conductor 54, the fourth portion 55d of coil conductor 55, the first portion 56a of coil conductor 56, the second portion 57b of coil conductor 57, and the third portion 58c of coil conductor 58.

[0058] In coil 3, the number of turns of coil 3 in coil region R31 is less than the number of turns of coil 3 in coil region R32. The number of turns of coil 3 in coil region R31 is the number of times coil 3 passes through coil region R31, which is 4 in this case. The number of turns of coil 3 in coil region R32 is the number of times coil 3 passes through coil region R32, which is 5 in this case.

[0059] The base body 2 has a base body region R21 and a base body region R22. Base body region R21 is located in the third direction D3 between the side surface 2e and the coil region R31 of the coil 3. Base body region R21 and coil region R31 are adjacent to each other. Viewed from the second direction D2, base body region R21 is configured to connect the side surface 2e and the coil 3. Base body region R21 and coil region R31 are in contact with each other. Base body region R21 includes at least a portion of the side surface 2e.

[0060] The body region R22 is located in the third direction D3 between the side surface 2f and the coil region R32 of the coil 3. The body region R22 and the coil region R32 are adjacent to each other. Viewed from the second direction D2, the body region R22 is configured to connect the side surface 2f and the coil 3. The body region R22 and the coil region R32 are in contact with each other. The body region R22 includes at least a portion of the side surface 2f.

[0061] The contact area between coil 3 and the body region R21 is smaller than the contact area between coil 3 and the body region R22. Viewed from the third direction D3, the overlapping area between coil region R31 and body region R21 is smaller than the overlapping area between coil region R32 and body region R22. In the third direction D3, body region R21 is shorter than body region R22.

[0062] In this embodiment, the length of the first direction D1 of both the body regions R21 and R22 is equal to the length of the first direction D1 of the coil 3. Viewed from the third direction D3, the body regions R21 and R22 are arranged to completely overlap with the coil 3. That is, the body regions R21 and R22 are provided throughout the entire length of the coil 3 in both the first direction D1 and the second direction D2, respectively.

[0063] In the description of the implementation method, "equivalent" can mean not only equal, but also values ​​that include minor differences or manufacturing errors within a predetermined range. For example, if multiple values ​​are within ±5% of the average of the multiple values, then the multiple values ​​are defined as equivalent.

[0064] The length of the first direction D1 of both body regions R21 and R22 is shorter than the length of the first direction D1 of body 2. Both body regions R21 and R22 are isolated from end faces 2a and 2b. The length of the second direction D2 of both body regions R21 and R22 is equal to the length of the second direction D2 of body 2. Body region R21 is provided along the entire length of the second direction D2 of side face 2e. Body region R22 is provided along the entire length of the second direction D2 of side face 2f.

[0065] The body region R21 includes the portion of side surface 2e in each magnetic layer 11. The body region R22 includes the portion of side surface 2f in each magnetic layer 11. In addition to side surface 2e, the body region R21 also includes the portion of side surface 2e in each of the main surfaces 2c and 2d. In addition to side surface 2f, the body region R22 also includes the portion of side surface 2f in each of the main surfaces 2c and 2d.

[0066] The resistivity of the substrate region R21 is higher than that of the substrate region R22. The resistivity of the portion of the substrate 2 other than the substrate regions R21 and R22 may be the same as, for example, the resistivity of the substrate region R22, but may also be different. As described above, the substrate 2 has a plurality of metallic magnetic particles 6, an insulating coating 7 covering the surface of the plurality of metallic magnetic particles 6, and resin 8 present between the plurality of metallic magnetic particles 6. There are voids 9 between the plurality of metallic magnetic particles 6 in the substrate 2 where the resin 8 is not present.

[0067] The proportion of voids 9 in the substrate region R21 can be less than the proportion of voids 9 in the substrate region R22. Furthermore, the proportion of resin 8 in the substrate region R21 can be greater than the proportion of resin 8 in the substrate region R22. Additionally, the proportion of insulating film 7 in the substrate region R21 can be greater than the proportion of insulating film 7 in the substrate region R22. Any of these methods can result in a higher resistivity in the substrate region R21 than in the substrate region R22.

[0068] The average particle size of the plurality of metallic magnetic particles 6 in the substrate region R21 can be smaller than the average particle size of the plurality of metallic magnetic particles 6 in the substrate region R22. Therefore, the proportion of the insulating coating 7 in the substrate region R21 can be greater than the proportion of the insulating coating 7 in the substrate region R22. As a result, the resistivity of the substrate region R21 can be higher than the resistivity of the substrate region R22.

[0069] In this embodiment, the "average particle size" is as described above. The average particle size of the metallic magnetic particles 6 in the body region R21 is 0.5 μm or more and 10 μm or less. The average particle size of the metallic magnetic particles 6 in the body region R22 is 1.0 μm or more and 20 μm or less.

[0070] The method for measuring the resistivity of the body region R21 is described. First, only the body region R21 is machined from the coil component 1 by grinding. Next, a pair of terminals are installed in the body region R21. The probe is brought into contact with the pair of terminals, and the resistance is measured. The distance between the pair of terminals is measured, and the resistivity is calculated. The resistivity of the body region R22 can also be measured by similarly machining only the body region R22 from the coil component 1. Figure 5In the example, by grinding the coil component 1 from the side 2e, a cuboid can be obtained in which at least the central part of the first direction D1 is composed only of the body region R21. The electrode portions 4d and 5d remaining at both ends of the first direction D1 can also be used as a pair of terminals to measure the resistance of the body region R21.

[0071] As explained above, in coil component 1, the resistivity of the body region R21 is higher than that of the body region R22. Body region R21 is located between side surface 2e and coil 3. Therefore, short circuits between coil 3 and electrode portions 4d and 5d disposed on side surface 2e can be suppressed. In coil component 1, the number of turns of coil 3 in coil region R31 is less than the number of turns of coil 3 in coil region R32. The difference in leakage flux caused by this difference in the number of turns is adjusted by positioning coil 3 closer to side surface 2e than side surface 2f.

[0072] In coil component 1, the distance between coil 3 and side surface 2e is short. Furthermore, the contact area between coil 3 and the body region R21 is larger than the contact area between coil 3 and the body region R22. Therefore, the structure in which the high-resistivity body region R21 is located between coil 3 and side surface 2e is particularly effective.

[0073] (Second Implementation)

[0074] Reference Figure 6 and Figure 7 The coil component 1A of the second embodiment will be described. Figure 6 As shown, coil component 1A differs from coil component 1 in the structure of its internal conductors and in the presence of a body 2A. Coil component 1A has a coil 3A, a connecting conductor 21, and a connecting conductor 24 as internal conductors disposed within the body 2A. Coil 3A and coil 3 (refer to...) Figure 2 , Figure 4 and Figure 5 Similarly, it is arranged within the base body 2A and has a coil axis Ax orthogonal to the main surfaces 2c and 2d. Base body 2A differs from base body 2 in that it has a shape corresponding to that of coil 3A.

[0075] The coil 3A is composed of multiple layers, including a cover layer Lc and conductor pattern layers L1, L2, L3, L4, and L5. The cover layer Lc is a layer consisting only of a magnetic body layer 11 containing metallic magnetic particles. Multiple cover layers Lc are disposed on the main surface 2c side and the main surface 2d side of the body 2A, respectively.

[0076] Conductor portions (coil conductor layers) are formed in a prescribed pattern on each layer except for the capping layer Lc. The conductor portions are, for example, made of a metallic material. There are no particular limitations on the material used; for example, Ag, Cu, Au, Al, Pd, Pd / Ag alloys, etc., can be used. Ti compounds, Zr compounds, Si compounds, etc., can also be added to the metallic material. The conductor portions can be formed, for example, using printing methods or thin-film growth methods.

[0077] Conductor pattern layer L1 and conductor pattern layer L2 are the layers that form the main part (winding part) of coil 3A. In this embodiment, conductor pattern layer L1, conductor pattern layer L2, and conductor pattern layer L3 are stacked sequentially to form a group. Inside the body 2A, multiple groups are provided in the stacked structure according to the number of turns required in coil 3A.

[0078] The conductor pattern layer L1 has a conductor pattern 12 (coil conductor layer). The conductor pattern 12 is generally rectangular and ring-shaped. The conductor pattern 12 has a first portion 12a extending along the third direction D3 on the end face 2a side, a second portion 12b extending along the first direction D1 on the side face 2e side, a third portion 12c extending along the third direction D3 on the end face 2b side, and a fourth portion 12d extending along the first direction D1 on the side face 2f side.

[0079] In conductor pattern 12, one end of the fourth portion 12d is connected to the end of the third portion 12c on the side 2f side, and the other end of the fourth portion 12d is located at the center of the first direction D1 in conductor pattern layer L1. First pad portions 13 are provided at the end of the first portion 12a on the side 2f side and at the connection portion between the third portion 12c and the fourth portion 12d. Additionally, a second pad portion 14 is provided at the other end of the fourth portion 12d.

[0080] The conductor pattern layer L2 has a conductor pattern 16 (coil conductor layer). The conductor pattern 16 is generally a rectangular ring. The conductor pattern 16 has a first portion 16a extending along the third direction D3 on the end face 2a side, a second portion 16b extending along the first direction D1 on the side face 2e side, and a third portion 16c extending along the third direction D3 on the end face 2b side. In addition, the conductor pattern 16 has a fourth portion 16d extending along the first direction D1 on the side face 2f side.

[0081] In conductor pattern 16, one end of the fourth portion 16d is connected to the end of the first portion 16a on the side 2f side, and the other end of the fourth portion 16d is located at the center of the first direction D1 in conductor pattern layer L2. First pad portions 13 are provided at the connection between the first portion 16a and the fourth portion 16d, and at the end of the third portion 16c on the side 2f side. Additionally, a third pad portion 17 is provided at the other end of the fourth portion 16d.

[0082] In this embodiment, as described above, the other end of the fourth portion 12d of the conductor pattern 12 where the second pad portion 14 is provided and the other end of the fourth portion 16d of the conductor pattern 16 where the third pad portion 17 is provided are both located at the center of the first direction D1. Therefore, the second pad portion 14 and the third pad portion 17 are in a state of overlapping each other in the stacking direction.

[0083] The conductor pattern layer L3 functions as a layer to ensure interlayer connectivity between adjacent groups of conductor pattern layers L1 and L2 in the stacking direction. The conductor pattern layer L3 has only pad portions 18 as conductor portions. The pad portions 18 are correspondingly arranged with the second pad portion 14 of the conductor pattern 12 and the third pad portion 17 of the conductor pattern 16. That is, the pad portions 18 overlap with the second pad portion 14 and the third pad portion 17 in the stacking direction.

[0084] The conductor pattern layer L4 is the layer that connects the coil 3A to the external electrode 4. The conductor pattern layer L4 is disposed on the main surface 2c side. On the main surface 2c side, a conductor pattern layer L3 is disposed on the upper side (main surface 2c side) of the conductor pattern layer L1 in the group closest to the main surface 2c side. The conductor pattern layer L4 has a pad portion 19, a coil conductor 20, and a connecting conductor 21. The pad portion 19 is disposed in a manner that overlaps with the pad portion 18 of the conductor pattern layer L3 in the stacking direction. The pad portion 19 is electrically connected to the pad portion 18 via a through-hole (not shown). The coil conductor 20 extends from the pad portion 19 toward the connecting conductor 21 in the first direction D1. The connecting conductor 21 is disposed on the edge portion on the end face 2a side. The connecting conductor 21 is connected to the electrode portion 4a at the end face 2a.

[0085] The conductor pattern layer L5 is the layer that connects the coil 3A to the external electrode 5. The conductor pattern layer L5 is disposed on the main surface 2d side. On the main surface 2d side, the conductor pattern layer L5 is disposed on the lower layer side (main surface 2d side) of the conductor pattern layer L3 located in the group closest to the main surface 2d side. The conductor pattern layer L5 has a pad portion 22, a coil conductor 23, and a connecting conductor 24. The pad portion 22 is disposed in a manner that overlaps with the pad portion 18 of the conductor pattern layer L3 in the stacking direction. The pad portion 22 is electrically connected to the pad portion 18 via a through-hole (not shown). The coil conductor 23 extends from the pad portion 22 toward the connecting conductor 24 in the first direction D1. The connecting conductor 24 is disposed on the edge portion on the end face 2b side. The connecting conductor 24 is connected to the electrode portion 5a at the end face 2b.

[0086] Next, the connection relationship between the conductor pattern layer L1 and the conductor pattern layer L2 will be explained in further detail. Figure 7This is a diagram showing the connection relationship of the conductor pattern layers. As shown in the diagram, when conductor pattern layer L1 and conductor pattern layer L2 are connected, conductor pattern 12 and conductor pattern 16 respectively have parallel portions P1 that overlap each other in the stacking direction and non-parallel portions P2 that do not overlap each other in the stacking direction.

[0087] In this embodiment, the first portions 12a, 16a, the second portions 12b, 16b, and the third portions 12c, 16c of conductor patterns 12 and 16 form parallel portions P1, and the fourth portions 12d, 16d form non-parallel portions P2. In one set, the first pad portions 13, 13 of the parallel portions P1 of conductor pattern 12 and the parallel portions P1 of conductor pattern 16 are interconnected via the first through-hole T1. On the other hand, in another set, the second pad portion 14 of the non-parallel portion P2 of conductor pattern 12 and the third pad portion 17 of the non-parallel portion P2 of conductor pattern 16 are not connected.

[0088] The second pad portion 14 and the third pad portion 17 are used for connections between a group and adjacent groups in the stacking direction relative to that group. Figure 7 In the example, the second pad portion 14 of the non-parallel portion P2 of a group of conductor patterns 12 and the third pad portion 17 of the non-parallel portion P2 of a group of conductor patterns 16 located on one side of the stacking direction are interconnected via the pad portion 18 of the conductor pattern layer L3 and the second via T2. The third pad portion 17 of the non-parallel portion P2 of a group of conductor patterns 16 and the second pad portion 14 of the non-parallel portion P2 of a group of conductor patterns 12 located on the other side of the stacking direction are interconnected via the pad portion 18 of the conductor pattern layer L3 and the second via T2.

[0089] With coil 3 (refer to) Figure 5 Similarly, coil 3A is shifted towards side 2e in the third direction D3. That is, coil 3A is positioned closer to side 2e than side 2f. The distance between coil 3A and side 2e in the third direction D3 is shorter than the distance between coil 3A and side 2f in the third direction D3. Coil 3A is positioned at approximately equal distances from end face 2a and end face 2b.

[0090] In coil 3A, coil region R31 (refer to...) Figure 5 This includes the second part 12b of conductor pattern 12 and the second part 16b of conductor pattern 16. Coil region R32 (refer to...) Figure 5 It includes the fourth part 12d of conductor pattern 12 and the fourth part 16d of conductor pattern 16.

[0091] As described above, the number of turns of coil 3A in coil region R31 is the number of times coil 3A passes through coil region R31. The parallel portion P1 of conductor pattern 12 and the parallel portion P1 of conductor pattern 16 in a set are interconnected via the first through-hole T1, with almost no potential difference, so the number of turns is counted as one conductor pattern. Therefore, the number of turns of coil 3A in coil region R31 is 2. The number of turns of coil 3A in coil region R32 is the number of times coil 3A passes through coil region R32, which is 3 in this case. Therefore, the number of turns of coil 3A in coil region R31 is also smaller than the number of turns of coil 3A in coil region R32.

[0092] Substance 2A, like Substance 2, has substance region R21 and substance region R22. Substance region R21 includes the portion of side 2e of each of the capping layer Lc and the conductor pattern layers L1, L2, L3, L4, and L5. Substance region R22 includes the portion of side 2f of each of the capping layer Lc and the conductor pattern layers L1, L2, L3, L4, and L5. In addition to side 2e, substance region R21 also includes the portion of side 2e of each of the main surfaces 2c and 2d. In addition to side 2f, substance region R22 also includes the portion of side 2f of each of the main surfaces 2c and 2d.

[0093] In coil component 1A, the resistivity of the body region R21 is also higher than that of the body region R22. The resistivity of the portion of body 2A other than the body regions R21 and R22 may be the same as, for example, the resistivity of the body region R22, but may also be different.

[0094] As explained above, in coil component 1A, the resistivity of the body region R21 is higher than that of the body region R22. Furthermore, the number of turns of coil 3A in coil region R31 is less than the number of turns of coil 3A in coil region R32. Additionally, the distance between coil 3A and the side surface 2e is shorter. Furthermore, the contact area between coil 3A and body region R21 is greater than the contact area between coil 3A and body region R22. Therefore, the same effect as in coil component 1 can be obtained in coil component 1A.

[0095] In coil region R31, the second portions 12b and 16b, which are parallel portions P1, are arranged in parallel. Conversely, in coil region R32, the fourth portions 12d and 16d, which are non-parallel portions P2, are arranged in series. If the resistance of each of the second portions 12b and 16b is R, and the current flowing through each of the second portions 12b and 16b is I, then the resistance of each of the fourth portions 12d and 16d becomes 2R, and the current flowing through each of the fourth portions 12d and 16d becomes 2I. Therefore, the voltage applied to coil region R31 is IR, while the voltage applied to coil region R32 is 4IR. Thus, because coil region R32 has a larger capacitance, the structure in the third direction D3, where the body region R22 is longer than the body region R21, is effective in suppressing short circuits.

[0096] (Third implementation)

[0097] Reference Figures 8-10 The coil component 1B of the third embodiment will be described below. Figure 8 As shown, coil component 1B differs from coil component 1 in the structure of its internal conductors and in the inclusion of body 2B. Coil component 1B has a coil 3B, a connecting conductor 31, and a connecting conductor 32 as internal conductors disposed within body 2B. Coil 3B and coil 3 (refer to...) Figure 2 , Figure 4 and Figure 5 Similarly, coil 3B is arranged within body 2B and has a coil axis Ax orthogonal to main surfaces 2c and 2d. Coil 3B includes a plurality of coil conductors C. In this embodiment, coil 3B includes nine coil conductors 41 to 49. Coil 3B also includes a through-hole conductor 50.

[0098] Coil conductors C (coil conductors 41-49) are disposed within the body 2B. The thickness of each coil conductor C is, for example, approximately 5-300 μm. Coil conductors 41-49 are separated from each other in the second direction D2. The distances between adjacent coil conductors 41-49 in the second direction D2 are equal, but may also be different. The distances between coil conductors 41-49 are, for example, 5-30 μm, and in this embodiment, are 15 μm.

[0099] Figure 9 This is a top view of the coil conductor. Coil conductor 42 is shown in this figure. Among the various coil conductors C, coil conductors 41 to 48 will be described first. Figure 8 and Figure 9 As shown, when viewed from the second direction D2 (along the direction of the coil axis Ax), the coil conductors 41-48 are spiral-shaped. The coil conductors 41-48 have multiple first conductor portions SC1, multiple second conductor portions SC2, and multiple third conductor portions SC3.

[0100] Multiple first conductor portions SC1 extend along the first direction D1 on both side surface 2e and side surface 2f. The multiple first conductor portions SC1 on side surface 2e and side surface 2f are opposite each other in the third direction D3, separated by the coil axis Ax. Multiple second conductor portions SC2 extend along the third direction D3 on both end face 2a and end face 2b. The multiple second conductor portions SC2 on end face 2a and end face 2b are opposite each other in the first direction D1, separated by the coil axis Ax.

[0101] The second conductor section SC2 is shorter than the first conductor section SC1. In other words, the first conductor section SC1 is longer than the second conductor section SC2. Each third conductor section SC3 forms a corner of the coil conductor C. The third conductor section SC3 is curved. The third conductor section SC3 has a specified curvature. In the third conductor section SC3, the outer side surface is parallel to the inner side surface. That is, in the third conductor section SC3, the curvature of the outer side surface is different from the curvature of the inner side surface. The widths of the first conductor section SC1, the second conductor section SC2, and the third conductor section SC3 are, for example, approximately 5 to 300 μm.

[0102] The first distance Dc1 between adjacent first conductor portions SC1 disposed on side 2e or side 2f and in the third direction D3 is equal to the second distance Dc2 between adjacent second conductor portions SC2 disposed on end face 2a or end face 2b and in the first direction D1 (Dc1≈Dc2). The first distance Dc1 and the second distance Dc2 may also be different from each other. When viewed from the second direction D2, the third distance Dc3 between adjacent third conductor portions SC3 is greater than the first distance Dc1 and the second distance Dc2 (Dc3>Dc1, Dc2). The first distance Dc1 and the second distance Dc2 are, for example, 5~30 μm. In this embodiment, the first distance Dc1 and the second distance Dc2 are 10 μm. The third distance Dc3 is, for example, 8~50 μm. In this embodiment, the third distance Dc3 is 15 μm.

[0103] Coil conductors 42, 44, 46, and 48 are identical in shape. Coil conductors 41 and 43 are similar in shape. The end 43a of coil conductor 43 differs from the end 41a of coil conductor 41 in that it is located on the side 2e. Coil conductors 43, 45, and 47 are identical in shape.

[0104] Next, the coil conductor 49 will be described. Viewed from the second direction D2, the coil conductor 49 is approximately L-shaped. The coil conductor 49 has one first conductor portion SC1, one second conductor portion SC2, and two third conductor portions SC3. Viewed from the second direction D2, the coil conductor 49 is approximately U-shaped or C-shaped, and may also have one first conductor portion SC1, two second conductor portions SC2, and two third conductor portions SC3. The first conductor portion SC1 of the coil conductor 49 is positioned on the side 2f further than the coil axis Ax.

[0105] The through-hole conductor 50 is located between the ends of each coil conductor 41-49 that are adjacent to each other in the second direction D2. The through-hole conductor 50 connects the ends of each coil conductor 41-49 that are adjacent to each other in the second direction D2. Multiple coil conductors 41-49 are electrically connected to each other through the through-hole conductor 50. The end of coil conductor 41 forms one end of coil 3B. The end of coil conductor 49 forms the other end of coil 3B.

[0106] Through-hole conductor 50 connects end 41b of coil conductor 41 and end 42a of coil conductor 42. Through-hole conductor 50 connects end 42b of coil conductor 42 and end 43a of coil conductor 43. Through-hole conductor 50 connects end 43b of coil conductor 43 and end 44a of coil conductor 44. Through-hole conductor 50 connects end 44b of coil conductor 44 and end 45a of coil conductor 45. Through-hole conductor 50 connects end 45b of coil conductor 45 and end 46a of coil conductor 46. Through-hole conductor 50 connects end 46b of coil conductor 46 and end 47a of coil conductor 47. Through-hole conductor 50 connects end 47b of coil conductor 47 and end 48a of coil conductor 48. Through-hole conductor 50 connects end 48b of coil conductor 48 and end 49a of coil conductor 49.

[0107] Connecting conductor 31 is connected to coil conductor 41. Connecting conductor 31 and coil conductor 41 are continuous. Connecting conductor 31 and coil conductor 41 are integrally formed. Connecting conductor 31 connects end 41a of coil conductor 41 to external electrode 4 and is exposed at end face 2a of body 2B. Connecting conductor 31 is connected to electrode portion 4a. Connecting conductor 31 electrically connects one end of coil 3B to external electrode 4.

[0108] Connecting conductor 32 is connected to coil conductor 49. Connecting conductor 32 and coil conductor 49 are continuous. Connecting conductor 32 and coil conductor 49 are integrally formed. Connecting conductor 32 connects end 49b of coil conductor 49 to external electrode 5 and is exposed at end face 2b of body 2B. Connecting conductor 32 is connected to electrode portion 5a. Connecting conductor 32 electrically connects the other end of coil 3B to external electrode 5.

[0109] The coil conductor C and connecting conductors 31 and 32 contain a conductive material. The conductive material may be, for example, Ag, Pd, Cu, Al, or Ni. The through-hole conductor 50 contains a conductive material. The conductive material may be, for example, Ag, Pd, Cu, Al, or Ni. The through-hole conductor 50 is configured as a sintered body of a conductive paste. The conductive paste contains conductive metal powder. The conductive metal powder may be, for example, Ag powder, Pd powder, Cu powder, Al powder, or Ni powder.

[0110] Figure 10 yes Figure 8 The figure shows a top view of the coil assembly. The coil assembly 1B is shown as viewed from the main surface 2c side. As shown, the coil 3B is positioned approximately equidistant from side surfaces 2e and 2f. The coil 3B is also positioned approximately equidistant from end surfaces 2a and 2b. Like the coil 3, the coil 3B has coil regions R31 and R32. In the coil 3B, coil region R31 includes a first conductor portion SC1 on the side surface 2e, and coil region R32 includes a first conductor portion SC1 on the side surface 2f.

[0111] In coil 3B, coil conductors 41-48 each have a first conductor portion SC1 on both side 2e and side 2f, while coil conductor 49 has a first conductor portion SC1 only on side 2f. Therefore, the number of turns of coil 3B in coil region R32 is greater than the number of turns of coil 3B in coil region R31. Consequently, the probability of a short circuit occurring between coil 3B and electrode portion 4e or electrode portion 5e is higher than the probability of a short circuit occurring between coil 3B and electrode portion 4d or electrode portion 5d.

[0112] In this embodiment, the "number of turns" of the spiral coil conductors 41-48 can also be the number of turns counted in the outermost peripheral portion (the outermost turn) where the parasitic capacitance between the coil and the external electrodes 4 and 5 is most likely to increase. In this case, the number of turns of coil 3B in coil region R31 is counted in the conductor portion closest to side 2e, and is therefore 4. The number of turns of coil 3B in coil region R32 is counted in the conductor portion closest to side 2f, and is therefore 5.

[0113] As described above, coil component 1B differs from coil component 1 in that it includes body 2B. Body 2B differs from body 2 in that body regions R21 and R22 have equal lengths in the third direction D3, and that the resistivity of body region R22 (the first body region) is higher than that of body region R21 (the second body region). Therefore, even though the number of turns of coil 3B in coil region R32 is greater than the number of turns of coil 3B in coil region R31, it is possible to suppress short circuits between coil 3B and electrode portion 4e or electrode portion 5e.

[0114] In the substrate 2B, the proportion of voids 9 in substrate region R22 is less than the proportion of voids 9 in substrate region R21. Furthermore, the proportion of resin 8 in substrate region R22 is greater than the proportion of resin 8 in substrate region R21. Additionally, the proportion of insulating film 7 in substrate region R22 is greater than the proportion of insulating film 7 in substrate region R21. Furthermore, the average particle size of the plurality of metallic magnetic particles 6 in substrate region R22 is smaller than the average particle size of the plurality of metallic magnetic particles 6 in substrate region R21. Any of these factors allows the resistivity of substrate region R22 to be higher than the resistivity of substrate region R21.

[0115] As explained above, in coil component 1B, the resistivity of the body region R22 is higher than that of the body region R21. Body region R22 is located between side surface 2f and coil 3B. Therefore, short circuits between coil 3B and the electrode portions 4e and 5e disposed on side surface 2f can be suppressed. In particular, in coil component 1B, the number of turns of coil 3B in coil region R32 is greater than the number of turns of coil 3B in coil region R31. Furthermore, the contact area between coil 3B and body region R22 is larger than the contact area between coil 3B and body region R21. Therefore, the structure in which the high-resistivity body region R22 is located between coil 3B and side surface 2f is particularly effective.

[0116] (Fourth implementation)

[0117] Reference Figure 11 The coil component 1C of the fourth embodiment will be described. As shown in the figure, the coil component 1C differs from the coil component 1 in that it includes the body 2C. The body 2C differs from the body 2 in the shape of the body region R21. The length of the first direction D1 of the body region R21 is equal to the length of the first direction D1 of the body 2C. That is, the body region R21 is provided over the entire surface of the side surface 2e. The body region R21 includes the portion on the side surface 2e of the entire surface of the side surface 2e, the main surface 2c, the main surface 2d, the end surface 2a, and the end surface 2b.

[0118] In the coil component 1C, the high resistivity body region R21 is provided along the entire length of the first direction D1 of the portion of the side 2e side of the body 2C, so that short circuits between the coil 3 and the electrode portion 4d or the electrode portion 5d can be further suppressed.

[0119] (Fifth implementation)

[0120] Reference Figure 12The coil component 1D of the fifth embodiment will now be described. As shown in the figure, the coil component 1D differs from the coil component 1 in the structure of its internal conductors. In the coil component 1D, the coil 3 is not only offset towards the side surface 2e in the third direction D3, but also offset towards the end face 2b in the first direction D1. That is, the coil 3 is configured to be closer to the side surface 2e than the side surface 2f, and closer to the end face 2b than the end face 2a. The distance between the coil 3 and the end face 2b in the first direction D1 is shorter than the distance between the coil 3 and the end face 2a in the first direction D1. In the first direction D1, the connecting conductor 51 is longer than the connecting conductor 52.

[0121] Coil component 1D also differs from coil component 1 in that it includes body 2D. Body region R21 of body 2D has a region R21a located between coil 3 and side surface 2e and a region R21b located between coil 3 and end face 2b. In this example, region R21a and region R21b are in contact with each other at one corner of coil 3, but they may not be in contact.

[0122] Region R21a has the same structure as region R21 of base body 2. The length of region R21b in the third direction D3 is equal to the length of coil 3 in the third direction D3. Viewed from the first direction D1, region R21b is arranged to completely overlap with coil 3. That is, region R21b is provided throughout the entire length of coil 3 in both the second and third directions D2. The length of region R21b in the second direction D2 is equal to the length of base body 2D in the second direction D2.

[0123] Region R21b includes the portion on the end face 2b side of each magnetic layer 11. In addition to the end face 2b, region R21b also includes portions on the end face 2b side of each of the main faces 2c and 2d. Region R21b includes at least a portion of the end face 2b.

[0124] Similar to coil component 1, in coil component 1D, the resistivity of region R21a is also higher than that of the body region R22. Therefore, short circuits between coil 3 and electrode portions 4d and 5d disposed on side surface 2e can be suppressed. In coil component 1D, the resistivity of region R21b is higher than that of the body region R22. Therefore, short circuits between coil 3 and electrode portion 5a can be suppressed.

[0125] (Sixth implementation)

[0126] Reference Figure 13The coil component 1E of the sixth embodiment will now be described. As shown in the figure, the coil component 1E differs from the coil component 1 in the structure of its internal conductor. The structure of the internal conductor of the coil component 1E is the same as that of the internal conductor of the coil component 1D. The coil component 1E also differs from the coil component 1 in that it includes the body 2E. The body region R21 of the body 2E has a region portion R21a located between the coil 3 and the side surface 2e and a region portion R21b located between the coil 3 and the end face 2b. In this example, the region portion R21a and the region portion R21b are connected to each other at the corner between the end face 2b and the side surface 2e.

[0127] Region R21a differs from the body region R21 of body 2 in the following ways: Region R21a has the same length as body 2E in both the first direction D1 and the second direction D2. Region R21a is provided throughout the entire side surface 2e. In addition to side surface 2e, region R21a also includes portions on the side surface 2e of each of the end face 2a, end face 2b, main face 2c, and main face 2d.

[0128] On both the second direction D2 and the third direction D3, the region portion R21b has the same length as the base body 2E. The region portion R21b is provided throughout the end face 2b. Viewed from the first direction D1, the region portion R21b is arranged to overlap with the coil 3. In addition to the end face 2b, the region portion R21b also includes the portion on the end face 2b side of each of the main face 2c, main face 2d, side face 2e, and side face 2f.

[0129] Similar to coil component 1, in coil component 1E, the resistivity of region R21a is also higher than that of the body region R22. Therefore, short circuits between coil 3 and electrode portions 4d and 5d disposed on side surface 2e can be suppressed. In coil component 1E, the resistivity of region R21b is higher than that of the body region R22. Therefore, short circuits between coil 3 and electrode portion 5a disposed on end face 2b can be suppressed.

[0130] In the coil component 1E, a solid region R21 with high resistivity is provided throughout the entire surface of the side 2e and end face 2b, thereby further suppressing short circuits between the coil 3 and the electrode portion 4d, electrode portion 5d, or electrode portion 5a.

[0131] (Seventh implementation)

[0132] Reference Figure 14The coil component 1F of the seventh embodiment will now be described. As shown in the figure, the coil component 1F differs from the coil component 1 in the structure of its internal conductors. The structure of the internal conductors of the coil component 1F is the same as that of the internal conductors of the coil component 1D. The coil component 1F also differs from the coil component 1 in that it includes the body 2F. The body region R21 of the body 2F has a region portion R21a located between the coil 3 and the side surface 2e and a region portion R21b located between the coil 3 and the end face 2b. In this example, the region portion R21a and the region portion R21b are connected to each other at the corner between the end face 2b and the side surface 2e.

[0133] Region R21a differs from the body region R21 of body 2 in the following ways: In the first direction D1, region R21a has a length longer than coil 3 and shorter than body 2F. Region R21a is separated from end face 2a in the first direction D1. The end portion of region R21a on the end face 2a side is located closer to end face 2a than coil 3 in the first direction D1. In addition to side face 2e, region R21a also includes portions on the side face 2e side of each of the end face 2b, main face 2c, and main face 2d.

[0134] In the third direction D3, the region portion R21b has a length longer than the coil 3 and shorter than the body 2F. The region portion R21b is disposed separately from the side surface 2f in the third direction D3. The end of the region portion R21b on the side surface 2f is located closer to the side surface 2f than the coil 3 in the third direction D3. Viewed from the first direction D1, the region portion R21b is configured to completely overlap with the coil 3. In addition to the end face 2b, the region portion R21b also includes the portion on the end face 2b side of each of the main face 2c, main face 2d, and side surface 2e.

[0135] Similar to coil component 1, in coil component 1F, the resistivity of region R21a is also higher than that of the body region R22. Therefore, short circuits between coil 3 and electrode portions 4d and 5d disposed on side surface 2e can be suppressed. In coil component 1F, the resistivity of region R21b is higher than that of the body region R22. Therefore, short circuits between coil 3 and electrode portion 5a can be suppressed.

[0136] In the coil component 1F, a region portion R21a is provided to the end face 2b, and a region portion R21b is provided to the side face 2e. Furthermore, the end portion of the region portion R21a on the end face 2a side is located closer to the end face 2a than the coil 3 in the first direction D1. Therefore, short circuits between the coil 3 and the electrode portion 4d or the electrode portion 5d can be reliably suppressed. Additionally, the end portion of the region portion R21b on the side face 2f side is located closer to the side face 2f than the coil 3 in the third direction D3. Therefore, short circuits between the coil 3 and the electrode portion 5a can be reliably suppressed.

[0137] (Eighth embodiment)

[0138] Reference Figure 15 The coil component 1G of the eighth embodiment will be described. As shown in the figure, the coil component 1G differs from the coil component 1 in that it has a body 2G. The body 2G differs from the body 2 in the shape of the body region R21. In the body 2G, the body region R21 has a region portion R21c and a region portion R21d that are separated from each other in the first direction D1. Between the side surface 2e and the coil 3, the region portion R21c is disposed on the end face 2a side, and the region portion R21d is disposed on the end face 2b side. The region portion R21c includes the portion of the side surface 2e on the end face 2a side, the end face 2a, the main face 2c, and the portion of the main face 2d on the end face 2a side and the side surface 2e side. The region portion R21d includes the portion of the side surface 2e on the end face 2b side, the end face 2b, the main face 2c, and the portion of the main face 2d on the end face 2b side and the side surface 2e side.

[0139] Region R21c extends along the first direction D1 to the position exposed from the external electrode 4. Region R21d extends along the first direction D1 to the position exposed from the external electrode 5. Viewed from the third direction D3, the body region R21 does not overlap with the central portion of the coil 3 along the first direction D1.

[0140] Similar to coil component 1, in coil component 1G, the resistivity of each region R21c and region R21d is also higher than that of the base region R22. Region R21c is disposed between coil 3 and electrode 4d, thus suppressing short circuits between coil 3 and electrode 4d. Region R21d is disposed between coil 3 and electrode 5d, thus suppressing short circuits between coil 3 and electrode 5d.

[0141] The above describes the implementation methods, but the present invention is not necessarily limited to the above implementation methods, and various modifications can be made without departing from its spirit.

[0142] For example, viewed from the third direction D3, the body region R21 can overlap with coils 3, 3A, and 3B. In the second direction D2, coils 3, 3A, and 3B are shorter than bodies 2, 2A, 2B, 2C, 2D, 2E, 2F, and 2G, so the length of the body region R21 can be greater than the length of coils 3, 3A, and 3B, but shorter than the length of bodies 2, 2A, 2B, 2C, 2D, 2E, 2F, and 2G. In this case, the body region R21 does not include the main surfaces 2c and 2d. For example, the outermost magnetic layer 11 constituting the stacking direction (i.e., the magnetic layer 11 having main surfaces 2c or 2d) may not have the body region R21. In coil component 1A, only conductor pattern layers L1, L2, L3, L4, and L5 may have the body region R21, while the cover layer Lc may not have the body region R21.

[0143] The above implementation methods and variations can also be appropriately combined.

Claims

1. A coil component, characterized in that, have: A base body having a main surface and a first side surface and a second side surface that are opposite to each other in the direction along the main surface; A coil, disposed within the body, having a coil axis orthogonal to the main surface; and External electrodes, which are disposed at least on the first side, The base body has: A first body region, which is located in the direction described above between the first side surface and the coil; and The second body region is located in the direction described above, between the second side surface and the coil. The resistivity of the first body region is higher than that of the second body region.

2. The coil component as claimed in claim 1, wherein, The substrate has multiple metallic magnetic particles and resin present between the multiple metallic magnetic particles. The proportion of voids between the plurality of metallic magnetic particles of the resin in the first body region is less than the proportion of voids in the second body region.

3. The coil component as claimed in claim 1, wherein, The substrate has multiple metallic magnetic particles and resin present between the multiple metallic magnetic particles. The proportion of the resin in the first body region is greater than the proportion of the resin in the second body region.

4. The coil component as claimed in claim 1, wherein, The substrate comprises: a plurality of metallic magnetic particles; an insulating coating covering the surface of the plurality of metallic magnetic particles; and a resin present between the plurality of metallic magnetic particles. The proportion of the insulating coating in the first body region is greater than the proportion of the insulating coating in the second body region.

5. The coil component as claimed in claim 4, wherein, The average particle size of the plurality of metallic magnetic particles in the first body region is smaller than the average particle size of the plurality of metallic magnetic particles in the second body region.

6. The coil component as claimed in any one of claims 1 to 5, wherein, In the stated direction, the first body region is shorter than the second body region.

7. The coil component as claimed in any one of claims 1 to 5, wherein, The coil has a first coil region adjacent to the first body region and a second coil region adjacent to the second body region. The number of turns of the coil in the first coil region is less than the number of turns of the coil in the second coil region.

8. The coil component as claimed in any one of claims 1 to 5, wherein, The coil has a first coil region adjacent to the first body region and a second coil region adjacent to the second body region. The area of ​​contact between the coil and the first body region is greater than the area of ​​contact between the coil and the second body region.

9. The coil component as claimed in any one of claims 1 to 5, wherein, In a direction orthogonal to the said direction and the coil axis, the first body region has the same length as the body.

10. The coil component as claimed in any one of claims 1 to 5, wherein, The substrate also has a third side adjacent to the main surface, the first side surface, and the second side surface, respectively. The external electrode has a first electrode portion disposed on the first side and a second electrode portion disposed on the third side. The first body region has a first region portion located between the first side and the coil and a second region portion located between the third side and the coil.

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