Laminated coil components

Abstract

To provide a lamination coil component capable of suppressing the generation of a short circuit between adjacent coil conductors.SOLUTION: A lamination coil component 1 comprises: an element body 2; a plurality of coil conductors 31, 32, and 33; and a first resistance layer and a second resistance layer. The plurality of coil conductors 31, 32, and 33 is arranged in an inner part of the element body 2, and is electrically connected each other as well as being arranged to a direction D3. Resistance layers 411 and 421 are arranged so as to be opposite each other between the adjacent coil conductors 31 and 32 each other from the plurality of coil conductors 31, 32, and 33. The resistance layer 411 is contacted to one coil conductor 31 of the adjacent coil conductors.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a laminated coil component. [Background Art]

[0002] A known laminated coil component includes an element body and a plurality of coil conductors disposed inside the element body (for example, Patent Document 1). The plurality of coil conductors are aligned in one direction and electrically connected to each other. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent Laid-Open No. 2017-59749 [Summary of Invention] [Problem to be Solved by Invention]

[0004] An object of an aspect of the present invention is to provide a laminated coil component that suppresses occurrence of a short circuit between adjacent coil conductors. [Means for Solving the Problem]

[0005] A laminated coil component according to one aspect of the present invention includes an element body, a plurality of coil conductors, a first resistance layer and a second resistance layer. The plurality of coil conductors are disposed inside the element body, aligned in one direction and electrically connected to each other. The first resistance layer and the second resistance layer are disposed between mutually adjacent coil conductors among the plurality of coil conductors so as to face each other. The first resistance layer is in contact with one of the mutually adjacent coil conductors.

[0006] In the above aspect, the first resistance layer and the second resistance layer are disposed between mutually adjacent coil conductors. Therefore, the above aspect easily increases the insulation resistance between mutually adjacent coil conductors. In one of the above embodiments, the first resistive layer is in contact with one of the coil conductors. Therefore, this embodiment reliably increases the insulation resistance between adjacent coil conductors. As a result, the above-described embodiment suppresses the occurrence of short circuits between adjacent coil conductors.

[0007] In one of the above embodiments, the first resistive layer may extend along one of the coil conductors. When viewed from one direction, the width of the first resistive layer may be greater than the width of one of the coil conductors. When viewed from one direction, a configuration in which the width of the first resistive layer extending along one coil conductor is greater than the width of the coil conductor further enhances the insulation resistance between adjacent coil conductors. Therefore, this configuration further suppresses the occurrence of short circuits between adjacent coil conductors.

[0008] In one of the above embodiments, the second resistive layer may extend along one of the coil conductors. When viewed from one direction, the width of the second resistive layer may be greater than the width of one of the coil conductors. When viewed from one direction, a configuration in which the width of the second resistive layer extending along one coil conductor is greater than the width of the coil conductor further enhances the insulation resistance between adjacent coil conductors. Therefore, this configuration further suppresses the occurrence of short circuits between adjacent coil conductors.

[0009] One embodiment described above may further include a stress-relieving layer disposed between the first resistance layer and the second resistance layer. The stress-relieving layer may be composed of at least one of resin and voids. The stress-relieving layer described above relieves internal stress generated within the element, and therefore, a configuration with this stress-relieving layer suppresses the occurrence of cracks between adjacent coil conductors. Consequently, this configuration suppresses the occurrence of short circuits caused by the cracks between adjacent coil conductors.

[0010] In one embodiment described above, the element body may have a portion positioned between the second resistance layer and the other one of mutually adjacent coil conductors. A configuration in which the element body has the above-mentioned portion tends to easily increase the insulation resistance between mutually adjacent coil conductors. Therefore, this configuration further suppresses the occurrence of a short circuit between mutually adjacent coil conductors.

[0011] In one embodiment described above, the first resistance layer and the second resistance layer may be formed of zirconia. Effects of the Invention

[0012] Provided is a multilayer coil component that suppresses occurrence of a short circuit between mutually adjacent coil conductors. Brief Description of Drawings

[0013] [Figure 1] FIG. 1 is a perspective view of a multilayer coil component according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the multilayer coil component according to the embodiment. [Figure 3] FIG. 3 is a plan view showing a coil conductor. [Figure 4] FIG. 4 is a plan view showing a coil conductor. [Figure 5] FIG. 5 is a plan view showing a coil conductor. [Figure 6] FIG. 6 is a diagram showing a cross-sectional configuration of the multilayer coil component according to the embodiment. [Figure 7] FIG. 7 is a diagram showing a cross-sectional configuration of the multilayer coil component according to the embodiment. [Figure 8] FIG. 8 is a diagram showing a cross-sectional configuration of a multilayer coil component according to a first modification of the embodiment. [Figure 9] FIG. 9 is a diagram showing a cross-sectional configuration of a multilayer coil component according to a second modification of the embodiment. Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are assigned the same reference numerals, and overlapping descriptions will be omitted as appropriate.

[0015] The configuration of the multilayer coil component 1 according to the present embodiment will be described with reference to FIGS. 1 to 7. FIG. 1 is a perspective view of the multilayer coil component according to the present embodiment. FIG. 2 is an exploded perspective view of the multilayer coil component according to the present embodiment. FIGS. 3 to 5 are plan views showing coil conductors. FIGS. 6 and 7 are diagrams showing a cross-sectional configuration of the multilayer coil component according to the present embodiment. The multilayer coil component 1 is solder-mounted on an electronic device. The electronic device includes, for example, a circuit board or an electronic component.

[0016] As shown in FIGS. 1 and 2, the multilayer coil component 1 includes an element body 2, a coil 3, a pair of lead conductors 34 and 35, at least one resistance layer 41, at least one resistance layer 42, and a pair of external electrodes 51 and 52. The coil 3 includes a plurality of coil conductors 31, 32, and 33. The resistance layer 41 constitutes a first resistance layer. The resistance layer 42 constitutes a second resistance layer. In the present embodiment, the number of each of the resistance layers 41 and 42 is "3". The resistance layers 41 and 42 constitute one set of resistance layers 41 and 42. The multilayer coil component 1 includes three sets of the resistance layers 41 and 42. The number of each of the plurality of coil conductors 31, 32, 33 and the resistance layers 41, 42 is not limited to the number described above. The number of each of the plurality of coil conductors 31, 32, 33 and the resistance layers 41, 42 may be larger or smaller than the number described above.

[0017] As shown in Figure 1, the base body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes, for example, a rectangular parallelepiped shape with chamfered corners and edges, and a rectangular parallelepiped shape with rounded corners and edges. The base body 2 has a pair of opposing end faces 2a, 2b and four side faces 2c, 2d, 2e, 2f. In this embodiment, the pair of end faces 2a, 2b face each other in direction D1, the side faces 2c, 2d face each other in direction D2, and the side faces 2e, 2f face each other in direction D3. The pair of end faces 2a, 2b and the four side faces 2c, 2d, 2e, 2f constitute the outer surface of the base body 2. The four side faces 2c, 2d, 2e, 2f are adjacent to the end faces 2a and 2b, respectively, and extend along direction D1 to connect the end faces 2a and 2b. One of the four sides 2c, 2d, 2e, and 2f is, for example, the side that faces the electronic device when the laminated coil component 1 is mounted on the electronic device (not shown).

[0018] Direction D1 is perpendicular to the pair of end faces 2a, 2b. Direction D2 is perpendicular to the side surfaces 2c, 2d. Direction D3 is perpendicular to the side surfaces 2e, 2f. Direction D1 is perpendicular to directions D2 and D3. Directions D2 and D3 are perpendicular to each other. Either direction D2 or direction D3 may constitute one direction. In this embodiment, an example in which direction D3 constitutes one direction will be described.

[0019] The base body 2 has multiple magnetic layers 10. As shown in Figures 3 to 5, the base body 2 is composed of multiple stacked magnetic layers 10. Each magnetic layer 10 is aligned in direction D3. Each magnetic layer 10 has a rectangular shape. The rectangular shape includes shapes with rounded corners and shapes with rounded corners. The multiple magnetic layers 10 are integrated to such an extent that the boundaries between each magnetic layer 10 are not visible. In Figure 2, the illustration of each magnetic layer 10 is omitted.

[0020] As shown in Figures 2 to 6, coil 3 is composed of multiple stacked coil conductors 31, 32, and 33. The multiple coil conductors 31, 32, and 33 are arranged inside the main body 2. The multiple coil conductors 31, 32, and 33 are aligned in the direction D3. Coil conductors 31 and 32 constitute adjacent coil conductors 31 and 32. Coil conductors 32 and 33 constitute adjacent coil conductors 32 and 33. Each coil conductor 31, 32, and 33 extends to form part of an annular trajectory when viewed from direction D3. Each coil conductor 31, 32, and 33 has a shape in which part of the loop is interrupted, for example. Each coil conductor 31, 32, and 33 extends along the annular trajectory from one end to the other.

[0021] Multiple coil conductors 31, 32, and 33 are electrically connected to each other. As shown in Figure 2, in this embodiment, the multiple coil conductors 31, 32, and 33 are electrically connected by multiple through-hole conductors 12b and 12c, respectively. One end T1 of coil conductor 31 and one end T2 of coil conductor 32 are electrically connected to each other by a through-hole conductor 12b. The other end T3 of coil conductor 32 and one end T4 of coil conductor 33 are electrically connected to each other by a through-hole conductor 12c. The multiple coil conductors 31, 32, and 33 constitute a coil 3 inside the element 2 by the fact that each end T1, T2, T3, T4 of each coil conductor 31, 32, and 33 is electrically connected to each other via through-hole conductors 12b and 12c.

[0022] Coil conductor 31 is positioned closest to side surface 2e in direction D3 among the coil conductors 31, 32, and 33. The other end E1 of coil conductor 31 constitutes one end E1 of coil 3. Coil conductor 33 is positioned closest to side surface 2f in direction D3 among the coil conductors 31, 32, and 33. The other end E2 of coil conductor 33 constitutes the other end E2 of coil 3.

[0023] As shown in Figure 6, the lead conductor 34 is positioned closer to the side surface 2e in direction D3 than the coil conductor 31. The lead conductor 34 and the coil conductor 31 are adjacent to each other in direction D3. One end T5 of the lead conductor 34 and the other end E1 of the coil conductor 31 are electrically connected to each other by a through-hole conductor 12a. The other end 34a of the lead conductor 34 is exposed to the end surface 2a of the element 2.

[0024] The lead conductor 35 is positioned closer to the side surface 2f in direction D3 than the coil conductor 33. The lead conductor 35 and the coil conductor 33 are adjacent to each other in direction D3. One end T6 of the lead conductor 35 and the other end E2 of the coil conductor 33 are electrically connected to each other by a through-hole conductor 12d. The other end 35a of the lead conductor 35 is exposed to the end surface 2b of the element 2.

[0025] As shown in Figures 1 and 6, a pair of external electrodes 51 and 52 are positioned at both ends of the body 2 in direction D1. The external electrodes 51 and 52 are positioned on the body 2 so as to face each other in direction D1. The external electrodes 51 and 52 are separated from each other in direction D1.

[0026] The portion of the external electrode 51 located on the end face 2a covers the end portion 34a exposed on the end face 2a. The end portion 34a and the external electrode 51 are electrically connected to each other. The lead conductor 34 and the external electrode 51 are electrically connected by the end portion 34a. The coil 3 is electrically connected to the external electrode 51.

[0027] The portion of the external electrode 52 located on the end face 2b covers the end portion 35a exposed on the end face 2b. The end portion 35a and the external electrode 52 are electrically connected to each other. The lead conductor 35 and the external electrode 52 are electrically connected by the end portion 35a. The coil 3 is electrically connected to the external electrode 52.

[0028] The resistive layers 41 and 42 are arranged facing each other between adjacent coil conductors among the multiple coil conductors 31, 32, and 33. The resistive layers 41 and 42 face each other in direction D3. In this embodiment, the first pair of resistive layers 41 and 42 are arranged between adjacent coil conductors 31 and 32. Hereinafter, the first pair of resistive layers 41 and 42 arranged between adjacent coil conductors 31 and 32 may be described as resistive layers 411 and 421. The resistive layer 411 is in contact with the coil conductor 31. The element 2 has a portion 21 located between the resistive layer 421 and the coil conductor 32. The thickness of portion 21 in direction D3 is greater than the thickness of the resistive layer 421 in direction D3. This thickness is defined, for example, by the minimum thickness in direction D3.

[0029] In this embodiment, the second pair of resistive layers 41, 42 are arranged between adjacent coil conductors 32, 33. Hereinafter, the second pair of resistive layers 41, 42 arranged between adjacent coil conductors 32, 33 may be described as resistive layers 412, 422. The resistive layer 412 is in contact with the coil conductor 32. The element 2 has a portion 22 located between the resistive layer 422 and the coil conductor 33. The thickness of portion 22 in direction D3 is greater than the thickness of the resistive layer 422 in direction D3. This thickness is defined, for example, by the minimum thickness in direction D3.

[0030] The third pair of resistive layers 41, 42 may be arranged between the coil conductor and the lead conductor, facing each other. For example, the resistive layers 41, 42 may be arranged between the coil conductor 33 and the lead conductor 35, facing each other. Hereinafter, the third pair of resistive layers 41, 42 arranged between the coil conductor 33 and the lead conductor 35 may be described as resistive layers 413, 423. The resistive layer 413 is in contact with the coil conductor 33. The element 2 has a portion located between the resistive layer 423 and the coil conductor 33. The thickness of this portion in direction D3 is greater than the thickness of the resistive layer 413 in direction D3. This thickness is defined, for example, by the minimum thickness in direction D3.

[0031] As shown in Figure 3, at least one of the resistive layers 411, 421 extends along at least a portion of the coil conductor 31. Viewed from direction D3, at least one of the resistive layers 411, 421 extends to form part of an annular orbit together with the coil conductor 31. Viewed from direction D3, the width of at least one of the resistive layers 411, 421 is greater than the width of the coil conductor 31. Viewed from direction D3, at least one of the resistive layers 411, 421 covers the coil conductor 31 completely. In this embodiment, each resistive layer 411, 421 extends along the entire coil conductor 31 except for the end T1. Viewed from direction D3, each resistive layer 411, 421 extends to form part of an annular orbit together with the coil conductor 31. Viewed from direction D3, the width of each of the resistive layers 411, 421 is greater than the width of the coil conductor 31. Viewed from direction D3, each resistive layer 411, 421 completely covers the coil conductor 31.

[0032] As shown in Figure 4, at least one of the resistive layers 412, 422 extends along at least a portion of the coil conductor 32. Viewed from direction D3, at least one of the resistive layers 412, 422 extends to form part of an annular orbit together with the coil conductor 32. Viewed from direction D3, the width of at least one of the resistive layers 412, 422 is greater than the width of the coil conductor 32. Viewed from direction D3, at least one of the resistive layers 412, 422 covers the coil conductor 32 completely. In this embodiment, each resistive layer 412, 422 extends along the entire coil conductor 32 except for the end T3. Viewed from direction D3, each resistive layer 412, 422 extends to form part of an annular orbit together with the coil conductor 32. Viewed from direction D3, the width of each of the resistive layers 412, 422 is greater than the width of the coil conductor 32. Viewed from direction D3, each resistive layer 412, 422 completely covers the coil conductor 32.

[0033] As shown in Figure 5, at least one of the resistive layers 413, 423 may extend along at least a portion of the coil conductor 33. Viewed from direction D3, at least one of the resistive layers 413, 423 may extend to form part of an annular track together with the coil conductor 33. Viewed from direction D3, the width of at least one of the resistive layers 413, 423 may be greater than the width of the coil conductor 33. Viewed from direction D3, at least one of the resistive layers 413, 423 may completely cover the coil conductor 32. In this embodiment, each resistive layer 413, 423 extends along the entire coil conductor 33 except for the end E2. Viewed from direction D3, each resistive layer 413, 423 extends to form part of an annular track together with the coil conductor 33. Viewed from direction D3, the width of each of the resistive layers 413, 423 is greater than the width of the coil conductor 33. Viewed from direction D3, each resistive layer 413, 423 completely covers the coil conductor 33.

[0034] As shown in Figures 6 and 7, the laminated coil component 1 further comprises a stress relaxation layer 60. The stress relaxation layer 60 is located between the resistance layer 41 and the resistance layer 42. The stress relaxation layer 60 is located between the resistance layers 411, 421, between the resistance layers 412, 422, and between the resistance layers 413, 423, respectively. In this embodiment, the stress relaxation layer 60 extends along at least a portion of the resistance layers 41, 42. The stress relaxation layer 60 extends along at least a portion of each coil conductor 31, 32, 33.

[0035] The thickness of the stress relaxation layer 60 in direction D3 may be greater than the thickness of at least one of the resistance layers 41 and 42 in direction D3. In this embodiment, the thickness of the stress relaxation layer 60 in direction D3 is greater than the respective thicknesses of the resistance layers 41 and 42. The thickness of the stress relaxation layer 60 in direction D3 is less than the thickness of each portion 21 and 22 in direction D3. The thickness of the stress relaxation layer 60 in direction D3 is, for example, 1.0 μm or more and 10 μm or less. The thickness of each resistance layer 41 and 42 in direction D3 is, for example, 0.1 μm or more and 5.0 μm or less. In this embodiment, the stress relaxation layer 60 is composed of voids 61.

[0036] The thickness of the stress relaxation layer 60 and the thickness of each resistance layer 41, 42 are defined, for example, by their minimum thickness. The thickness of the stress relaxation layer 60 and the thickness of each resistance layer 41, 42 may include a predetermined flatness. The thickness of the stress relaxation layer 60 and the thickness of each resistance layer 41, 42 may be measured, for example, at the position where the thickness of each resistance layer 41, 42 is minimum. The thickness of the stress relaxation layer 60 and the thickness of each resistance layer 41, 42 may be measured, for example, at the position where the thickness of the stress relaxation layer 60 is maximum.

[0037] The width of the stress relaxation layer 60 as viewed from direction D3 may be less than or equal to the width of each resistance layer 41, 42 as viewed from direction D3, or it may be greater than or equal to the width of each resistance layer 41, 42 as viewed from direction D3. In this embodiment, the width of the stress relaxation layer 60 as viewed from direction D3 is smaller than the width of each resistance layer 41, 42 as viewed from direction D3. The width of the stress relaxation layer 60 as viewed from direction D3 may be at least greater than the thickness of the stress relaxation layer in direction D3.

[0038] The details of the base body 2, the coil conductor 31, and each of the resistive layers 41, 42 will be described below with reference to Figure 7. The base body 2 contains a plurality of metallic magnetic particles M1. The plurality of metallic magnetic particles M1 are composed of, for example, a soft magnetic alloy. The soft magnetic alloy is, for example, an Fe-Si alloy. If the soft magnetic alloy is an Fe-Si alloy, the soft magnetic alloy may also contain P. The soft magnetic alloy may also be, for example, an Fe-Ni-Si-M alloy. "M" includes 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] Each metallic magnetic particle M1 contains an oxide film formed on its surface. Multiple adjacent metallic magnetic particles M1 are bonded together by the bonding of the oxide films formed on their surfaces. Multiple adjacent metallic magnetic particles M1 are bonded together with an oxide film present between them. In Figure 7, the illustration of the oxide film is omitted. The resistance value of each metallic magnetic particle M1 is, for example, 10 9 (Ω·cm) or more, and 10 11 It may also be less than (Ω·cm).

[0040] Body 2 contains an electrically insulating resin R1. The resin R1 is present between a plurality of metal magnetic particles M1. The resin R1 is an electrically insulating resin, i.e., an insulating resin. The insulating resin includes, for example, a silicone resin, a phenolic resin, an acrylic resin, or an epoxy resin. The resin R1 may be impregnated into the voids present between adjacent metal magnetic particles M1. The resistance value of the resin R1 is, for example, 10 12 (Ω·cm) or more, and 10 17 It may also be less than (Ω·cm).

[0041] Each coil conductor 31, 32, 33 is made of a conductive material. The conductive material may include, for example, Ag, Pd, Cu, Al, or Ni. In this embodiment, each coil conductor 31, 32, 33 is made of a sintered body of a conductive paste containing powder of the conductive material. Each through-hole conductor 12a, 12b, 12c, 12d is made of a conductive material. Each through-hole conductor 12a, 12b, 12c, 12d may be made of, for example, the same material as each coil conductor 31, 32, 33. Each lead conductor 34, 35 is made of a conductive material. Each lead conductor 34, 35 may be made of, for example, the same material as each coil conductor 31, 32, 33. Each coil conductor 31, 32, 33, each through-hole conductor 12a, 12b, 12c, 12d, or each lead conductor 34, 35 may be a plated conductor.

[0042] Each resistive layer 41, 42 is made of a material different from the base body 2. Each resistive layer 41, 42 may be made of a material having a greater resistance value than each metallic magnetic particle M1. Each resistive layer 41, 42 may be made of an insulating material. In this embodiment, each resistive layer 41, 42 is made of zirconia (ZrO2). In this embodiment, each resistive layer 41, 42 is formed by firing a paste containing zirconia particles Z1, an organic solvent, and an organic binder. The average particle size of the zirconia particles Z1 may be 0.1 μm or less. The resistance value of each resistive layer 41, 42 is, for example, 10 12 (Ω·cm) or more, and 10 14 It may also be less than (Ω·cm).

[0043] As explained above, in the laminated coil component 1, the resistive layers 411 and 421 are arranged between adjacent coil conductors 31 and 32. Therefore, the laminated coil component 1 easily increases the insulation resistance between adjacent coil conductors 31 and 32. In the laminated coil component 1, the resistive layers 412 and 422 are arranged between adjacent coil conductors 32 and 33. Therefore, the laminated coil component 1 easily increases the insulation resistance between adjacent coil conductors 32 and 33. In the laminated coil component 1, the resistive layer 411 is in contact with one of the coil conductors 31. Therefore, the laminated coil component 1 reliably increases the insulation resistance between adjacent coil conductors 31 and 32. In the laminated coil component 1, the resistive layer 412 is in contact with one of the coil conductors 32. Therefore, the laminated coil component 1 reliably increases the insulation resistance between adjacent coil conductors 32 and 33. As a result, the laminated coil component 1 suppresses the occurrence of short circuits between the coil conductors 31, 32, and 33.

[0044] In the laminated coil component 1, the resistive layer 411 extends along the coil conductor 31. The resistive layer 412 extends along the coil conductor 32. Viewed from direction D3, the width of the resistive layer 411 is greater than the width of the coil conductor 31. Viewed from direction D3, the width of the resistive layer 412 is greater than the width of the coil conductor 32. When viewed from direction D3, a configuration in which the width of the resistive layer 411 extending along the coil conductor 31 is greater than the width of the coil conductor 31 further reliably increases the insulation resistance between adjacent coil conductors 31 and 32. When viewed from direction D3, a configuration in which the width of the resistive layer 412 extending along the coil conductor 32 is greater than the width of the coil conductor 32 further reliably increases the insulation resistance between adjacent coil conductors 32 and 33. Therefore, the laminated coil component 1 further suppresses the occurrence of short circuits between coil conductors 31, 32, and 33.

[0045] In the laminated coil component 1, the resistive layer 421 extends along the coil conductor 31. The resistive layer 422 extends along the coil conductor 32. Viewed from direction D3, the width of the resistive layer 421 is greater than the width of the coil conductor 31. Viewed from direction D3, the width of the resistive layer 422 is greater than the width of the coil conductor 32. When viewed from direction D3, a configuration in which the width of the resistive layer 421 extending along the coil conductor 31 is greater than the width of the coil conductor 31 further reliably increases the insulation resistance between adjacent coil conductors 31 and 32. When viewed from direction D3, a configuration in which the width of the resistive layer 422 extending along the coil conductor 32 is greater than the width of the coil conductor 32 further reliably increases the insulation resistance between adjacent coil conductors 32 and 33. Therefore, the laminated coil component 1 further suppresses the occurrence of short circuits between coil conductors 31, 32, and 33.

[0046] The laminated coil component 1 further comprises a stress-relieving layer 60 positioned between the resistance layer 41 and the resistance layer 42. The stress-relieving layer 60 is composed of air gaps 61. The stress-relaxing layer 60 relieves the internal stress generated within the base body 2, thereby suppressing the occurrence of cracks between the coil conductors 31, 32, and 33 in the laminated coil component 1. Consequently, the laminated coil component 1 suppresses the occurrence of short circuits caused by the aforementioned cracks between the coil conductors 31, 32, and 33.

[0047] Internal stress within the base body 2 is generated, for example, during the firing process of the laminated coil component 1, by the difference in shrinkage between the multiple coil conductors 31, 32, 33 and other parts of the laminated coil component 1. The stress-relieving layer 60, composed of air gaps 61, can absorb the deformation caused by the above internal stress. Therefore, since the stress-relieving layer 60 relieves the internal stress generated within the base body 2, the laminated coil component 1 suppresses the occurrence of cracks between the coil conductors 31, 32, 33. The resistance layer 41 and the resistance layer 42 face each other with a stress relaxation layer 60 in between. For example, even if a crack occurs in the resistance layer 41 due to a difference in the amount of shrinkage between each coil conductor 31, 32, 33 and the resistance layer 41, the stress relaxation layer 60 is interposed between the resistance layer 41 and the resistance layer 42, making it difficult for the crack to propagate to the resistance layer 42. Therefore, even if a crack occurs, it is difficult for the crack to propagate to the point of connecting the coil conductors 31, 32, 33. Thus, the laminated coil component 1 reliably suppresses the occurrence of short circuits caused by the cracks between the coil conductors 31, 32, 33.

[0048] In the laminated coil component 1, the base body 2 has a portion 21 located between the resistive layer 421 and the other coil conductor 32 of the two adjacent coil conductors 31 and 32. The base body 2 also has a portion 22 located between the resistive layer 422 and the other coil conductor 33 of the two adjacent coil conductors 32 and 33. The configuration in which the base body 2 has portion 21 makes it easier to increase the insulation resistance between adjacent coil conductors 31 and 32. The configuration in which the base body 2 has portion 22 makes it easier to increase the insulation resistance between adjacent coil conductors 32 and 33. Therefore, the laminated coil component 1 makes it easier to increase the insulation resistance between coil conductors 31, 32, and 33, thereby further suppressing the occurrence of short circuits between coil conductors 31, 32, and 33.

[0049] Next, with reference to Figure 8, the configuration of the laminated coil component 1A according to the first modified example of this embodiment will be described. Figure 8 is a diagram showing the cross-sectional configuration of the laminated coil component according to the first modified example of this embodiment. The laminated coil component 1A is generally similar to or the same as the laminated coil component 1 described above. However, the laminated coil component 1A differs from the laminated coil component 1 in terms of the configuration of the stress relaxation layer. The differences between the laminated coil component 1A and the laminated coil component 1 will be mainly described below.

[0050] The laminated coil component 1A includes a stress relaxation layer 60A instead of the stress relaxation layer 60. The stress relaxation layer 60A is composed of a resin 62, which is, for example, resin R1. The resin R1 may be impregnated into the voids 61 along with the voids present between a plurality of adjacent metallic magnetic particles M1. The stress relaxation layer 60A has lower rigidity than the other parts of the laminated coil component 1A.

[0051] The laminated coil component 1A further comprises a stress relaxation layer 60A positioned between the resistance layer 41 and the resistance layer 42. The stress relaxation layer 60A is made of resin R1. The stress-relaxing layer 60A, composed of resin R1, is less rigid than other parts of the laminated coil component 1A and therefore deforms easily. Since the strain caused by internal stress within the base body 2 can be relieved by the deformation of the stress-relaxing layer 60A, the laminated coil component 1A suppresses the occurrence of cracks between the multiple coil conductors 31, 32, and 33. In the laminated coil component 1A, a stress-relieving layer 60A made of resin R1 is placed between the resistance layer 41 and the resistance layer 42. Each resistance layer 411 and 412, which are in contact with each coil conductor 31 and 32, are fixed to each coil conductor 31 and 32 by the resin R1 of the stress-relieving layer 60A. Therefore, even when each coil conductor 31 and 32 repeatedly expands and contracts due to temperature changes caused by current flow, each resistance layer 411 and 412 is unlikely to peel off from each coil conductor 31 and 32. As a result, the insulation resistance between the multiple coil conductors 31, 32, and 33 of the laminated coil component 1A is less prone to degradation. Therefore, the laminated coil component 1A further suppresses the occurrence of short circuits between the multiple coil conductors 31, 32, and 33.

[0052] Next, with reference to Figure 9, the configuration of the laminated coil component 1B according to the second modified example of this embodiment will be described. Figure 9 is a diagram showing the cross-sectional configuration of the laminated coil component according to the second modified example of this embodiment. The laminated coil component 1B is generally similar to or the same as the laminated coil component 1 described above. However, the laminated coil component 1B differs from the laminated coil component 1 in terms of the configuration of the multiple coil conductors. The differences between the laminated coil component 1B and the laminated coil component 1 will be mainly described below.

[0053] The laminated coil component 1B comprises multiple coil conductors 31B, 32B, 33B, and 34B instead of multiple coil conductors 31, 32, and 33. The laminated coil component 1B comprises multiple through-hole conductors 13a and 13b instead of multiple through-hole conductors 12b and 12c. The laminated coil component 1B comprises a resistive layer 43. Among the multiple coil conductors 31B, 32B, 33B, and 34B, it is sufficient that at least a portion of each coil conductor is adjacent to each other. A through-hole conductor may be interposed between adjacent coil conductors among the multiple coil conductors 31B, 32B, 33B, and 34B. Coil conductors 31B and 32B constitute adjacent coil conductors 31B and 32B. In coil conductors 31B and 32B, parts of the coil conductors 31B and 32B are adjacent to each other. A through-hole conductor 13a is interposed between coil conductors 31B and 32B. Coil conductors 32B and 33B constitute adjacent coil conductors 32B and 33B. In coil conductors 32B and 33B, parts of the coil conductors 32B and 33B are adjacent to each other. A through-hole conductor (not shown) is interposed between coil conductors 32B and 33B. Coil conductors 33B and 34B constitute adjacent coil conductors 33B and 34B. In coil conductors 33B and 34B, parts of the coil conductors 33B and 34B are adjacent to each other. A through-hole conductor 13b is interposed between coil conductors 33B and 34B.

[0054] The resistive layers 41 and 42 do not necessarily have to be placed on all adjacent coil conductors among the multiple coil conductors. In the laminated coil component 1B, the resistive layer 42, which is positioned opposite the resistive layer 41, is placed only between adjacent coil conductors 32B and 33B. The resistive layer 41 may cover the surface of one of the coil conductors in contact with the resistive layer 41. In the laminated coil component 1B, the resistive layer 41 covers the surface of each coil conductor 31B, 32B, 33B, and 34B. The resistive layer 43 covers the surfaces of the through-hole conductors 13a and 13b. For example, the surface of coil conductor 33B facing coil conductor 32B and the surface of coil conductor 33B facing coil conductor 34B may be covered by the resistive layer 41.

[0055] The present invention has been described in detail above based on its embodiments. However, the present invention is not limited to the above embodiments and modifications. The present invention can be modified in various ways without departing from its spirit.

[0056] In the resistive layers 41 and 42, it is sufficient that at least a portion of the resistive layers 41 and 42 are arranged facing each other. In the resistive layers 41 and 42, a portion of the resistive layers 41 and 42 may be in contact with each other. For example, at the ends of each resistive layer 41 and 42 as viewed from direction D3, the resistive layers 41 and 42 may be in contact.

[0057] The stress relaxation layers 60 and 60A may be placed between any one of the following: between resistance layers 411 and 421, between resistance layers 412 and 422, and between resistance layers 413 and 423. The stress relaxation layer 60A may be composed of a resin different from resin R1. The stress relaxation layers 60 and 60A may be composed of both resin and voids. For example, the stress relaxation layers 60 and 60A may include a portion made of resin and a portion made of voids.

[0058] As can be seen from the above-described embodiments and modifications, this specification includes the following embodiments: (Note 1) The base body and, A plurality of coil conductors are arranged inside the aforementioned body, aligned in one direction and electrically connected to one another, The plurality of coil conductors comprises a first resistive layer and a second resistive layer, which are arranged to face each other between adjacent coil conductors, A laminated coil component in which the first resistive layer is arranged to be in contact with one of the coil conductors that are adjacent to each other. (Note 2) The first resistance layer extends along the one coil conductor, The laminated coil component as described in Appendix 1, wherein, when viewed from the aforementioned direction, the width of the first resistive layer is greater than the width of one of the coil conductors. (Note 3) The second resistance layer extends along the one coil conductor, The laminated coil component according to Appendix 1 or Appendix 2, wherein, when viewed from the first direction, the width of the second resistive layer is greater than the width of the one coil conductor. (Note 4) The system further comprises a stress relaxation layer disposed between the first resistance layer and the second resistance layer, The laminated coil component according to any one of the appendices 1 to 3, wherein the stress-relaxing layer is composed of at least one of resin and voids. (Note 5) The laminated coil component according to Appendix 4, wherein the thickness of the stress relaxation layer in one direction is greater than the thickness of at least one of the first resistance layer and the second resistance layer in one direction. (Note 6) The laminated coil component according to any one of the appendices 1 to 5, wherein the base body has a portion located between the second resistive layer and the other coil conductor among the adjacent coil conductors. (Note 7) The laminated coil component described in any one of the appendices 1 to 6, wherein the first resistive layer and the second resistive layer are made of zirconia. [Explanation of Symbols]

[0059] 1,1A,1B...Laminated coil component, 2...Base body, 21,22...Parts, 31,32,33,31B,32B,33B,34B...Coil conductor, 41,42,411,421,412,422,413,423...Resistance layer, 60,60A...Stress relaxation layer, 61...Void, 62...Resin, D3...One direction.

Claims

1. A substrate comprising a plurality of metallic magnetic particles, A plurality of coil conductors are arranged inside the aforementioned body, aligned in one direction and electrically connected to one another, A first resistance layer and a second resistance layer are arranged between adjacent coil conductors among the plurality of coil conductors, so as to face each other. The system comprises a stress-relieving layer disposed between the first resistance layer and the second resistance layer, and composed of at least one of resin and voids. The first resistance layer and the second resistance layer have resistance values ​​greater than the resistance values ​​of each of the metal magnetic particles. The first resistive layer is in contact with one of the adjacent coil conductors, forming a laminated coil component.

2. A substrate comprising a plurality of metallic magnetic particles, A plurality of coil conductors are arranged inside the aforementioned body, aligned in one direction and electrically connected to one another, The plurality of coil conductors comprises a first resistive layer and a second resistive layer, which are arranged to face each other between adjacent coil conductors, The first resistive layer and the second resistive layer have a resistance value greater than the resistance value of each of the metal magnetic particles. The first resistive layer is in contact with one of the coil conductors that are adjacent to each other. The aforementioned body is a laminated coil component having a portion located between the second resistive layer and the other coil conductor among the adjacent coil conductors.

3. The first resistance layer extends along the one coil conductor, The laminated coil component according to claim 1 or 2, wherein, when viewed from the aforementioned direction, the width of the first resistive layer is greater than the width of the one coil conductor.

4. The second resistance layer extends along the one coil conductor, The laminated coil component according to claim 1 or 2, wherein, when viewed from the first direction, the width of the second resistive layer is greater than the width of the one coil conductor.

5. The laminated coil component according to claim 1, wherein the thickness of the stress relaxation layer in one direction is greater than the thickness of at least one of the first resistance layer and the second resistance layer in one direction.

6. The laminated coil component according to claim 1, wherein the element has a portion located between the second resistive layer and the other coil conductor among the adjacent coil conductors.

7. The laminated coil component according to claim 1 or 2, wherein the first resistive layer and the second resistive layer are made of zirconia.

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