Laminated coil components

Abstract

The stacked coil component of the present invention comprises a body, a first coil and a second coil, and a pair of external electrodes. The body is formed by stacking a plurality of insulating layers in a first direction. The body has a pair of end faces opposite to each other in a second direction orthogonal to the first direction. The first coil and the second coil are arranged in the body, and each has a coil axis along the second direction. A pair of external electrodes are arranged on a pair of end faces and electrically connected to both ends of the first coil and the second coil. The first coil has a first conductor layer, a second conductor layer and a first through-hole conductor. The first through-hole conductor extends in the first direction, connecting the first conductor layer and the second conductor layer. The second coil has a third conductor layer, a fourth conductor layer and a second through-hole conductor. The second through-hole conductor extends in the first direction, connecting the third conductor layer and the fourth conductor layer. The coil axis of the first coil is arranged on the inner side of the second coil. The first conductor layer and the third conductor layer are separated from each other in the first direction, and the first conductor layer and the third conductor layer are crossed when viewed from the first direction.

Description

Technical Field

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

[0002] A laminated coil component is known, which includes: a body having a plurality of laminated insulating layers, a coil disposed in the body, and a pair of external electrodes disposed on the end surface of the body (for example, refer to Japanese Patent Publication No. 2002-252117). In the laminated coil component described in Japanese Patent Publication No. 2002-252117, since the axial direction of the coil is consistent with the relative direction of the pair of external electrodes, the stray capacitance formed between the coil and the external electrodes can be reduced. As a result, the self-resonant frequency (SRF) of the laminated coil component is suppressed from becoming lower, and the high-frequency characteristics are improved. Summary of the invention

[0003] In order to increase the current flowing through the coil, the DC resistance of the coil needs to be reduced. Japanese Patent Publication No. 2002-252117 discloses a structure having two coils arranged in parallel. However, in this structure, since the inner diameter of each coil is small, the inductance is small.

[0004] An object of the present disclosure is to provide a laminated coil component capable of improving high frequency characteristics and reducing the DC resistance of the coil while maintaining a large inductance.

[0005] The stacked coil component disclosed in the present invention comprises a body, a first coil and a second coil, and a pair of external electrodes. The body is formed by stacking a plurality of insulating layers in a first direction. The body has a pair of end faces that are opposite to each other in a second direction that is orthogonal to the first direction. The first coil and the second coil are arranged in the body, and each has a coil axis along the second direction. A pair of external electrodes are arranged on a pair of end faces and are electrically connected to both ends of the first coil and the second coil. The first coil has a first conductor layer, a second conductor layer, and a first through-hole conductor. The first through-hole conductor extends in the first direction and connects the first conductor layer and the second conductor layer. The second coil has a third conductor layer, a fourth conductor layer, and a second through-hole conductor. The second through-hole conductor extends in the first direction and connects the third conductor layer and the fourth conductor layer. The coil axis of the first coil is arranged on the inner side of the second coil. The first conductor layer and the third conductor layer are separated from each other in the first direction, and the first conductor layer and the third conductor layer are crossed when viewed from the first direction.

[0006] In the stacked coil component, the coil axes of the first coil and the second coil are along the relative direction of a pair of end faces, that is, the second direction. Therefore, the stray capacitance formed between the first coil and the second coil and the external electrode can be reduced, and the high-frequency characteristics can be improved. The coil axis of the first coil is arranged on the inner side of the second coil. The first conductor layer and the third conductor layer are separated from each other in the first direction and cross each other when viewed from the first direction. With such a structure, the first coil and the second coil can form a large spiral while crossing each other. Therefore, the inductance can be increased.

[0007] The second conductor layer and the fourth conductor layer may be separated from each other in the first direction and may intersect each other when viewed from the first direction. In this case, the first coil and the second coil may increase the number of turns while intersecting each other.

[0008] The first conductor layer and the fourth conductor layer may be arranged at the same position as each other in the first direction. In this case, it is easy to further increase the inner diameter of the first coil and the inner diameter of the second coil.

[0009] The second conductor layer and the third conductor layer may be arranged at the same position as each other in the first direction. In this case, it is easy to further increase the inner diameter of the first coil and the inner diameter of the second coil.

[0010] The laminated coil component may further include a plurality of fifth conductor layers electrically connecting the first coil and the second coil to the external electrode. In this case, the resistance can be reduced compared to a case where the fifth conductor layer is a single layer.

[0011] Alternatively, the thickness of each fifth conductor layer may be thinner than the thickness of the first conductor layer, the thickness of the second conductor layer, the thickness of the third conductor layer, and the thickness of the fourth conductor layer. In this case, in the step of cutting the laminate substrate to separate the element body into pieces, the laminate substrate can be easily cut together with a plurality of fifth conductor layers connected thereto.

[0012] Alternatively, a plurality of fifth conductor layers may be arranged between the first conductor layer and the second conductor layer in the first direction and between the third conductor layer and the fourth conductor layer in the first direction. In this case, the inner diameters of the first coil and the second coil can be easily enlarged by increasing the number of fifth conductor layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view showing a laminated coil component according to one embodiment.

[0014] Figure 2 It is shown Figure 1 A three-dimensional view of the internal structure of a stacked coil component.

[0015] Figure 3 It is shown Figure 1 A side view of the internal structure of a stacked coil component.

[0016] Figure 4 This is an exploded perspective view for explaining the current flowing through the first coil and the second coil.

[0017] Figure 5 It is a plan view showing the positional relationship between the conductor layers constituting the first coil and the second coil. DETAILED DESCRIPTION

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the description, the same elements or elements having the same functions are denoted by the same reference numerals, and repeated descriptions are omitted.

[0019] Figure 1 FIG. 1 is a perspective view showing a laminated coil component according to one embodiment. Figure 1 As shown, the laminated coil component 1 involved in this embodiment includes: a rectangular element body 2 and a pair of external electrodes 4, 5 arranged on the surface of the element body 2. The pair of external electrodes 4, 5 are respectively arranged at the two ends of the element body 2 and are separated from each other. The rectangular shape includes a rectangular shape with chamfered corners and ridges, and a rectangular shape with rounded corners and ridges. The laminated coil component 1 can be applied to, for example, a magnetic bead inductor or a power inductor.

[0020] The element body 2 has a pair of end faces 2a, 2b and four side faces 2c, 2d, 2e, 2f as its surface. The pair of end faces 2a, 2b are opposite to each other. The pair of side faces 2c, 2d are opposite to each other. The pair of side faces 2e, 2f are opposite to each other. Each end face 2a, 2b and each side face 2c, 2d, 2e, 2f are adjacent to each other.

[0021] In the present embodiment, the direction in which the pair of side faces 2c and 2d are opposite to each other (the first direction D1) is the height direction of the element body 2. The direction in which the pair of end faces 2a and 2b are opposite to each other (the second direction D2) is the length direction of the element body 2. The direction in which the pair of side faces 2e and 2f are opposite to each other (the third direction D3) is the width direction of the element body 2. The first direction D1, the second direction D2, and the third direction D3 are orthogonal to each other.

[0022] The length of the second direction D2 of the element body 2 is longer than the length of the first direction D1 of the element body 2 and the length of the third direction D3 of the element body 2. The length of the first direction D1 of the element body 2 is equal to the length of the third direction D3 of the element body 2. That is, in the present embodiment, each end face 2a, 2b is square, and each side face 2c, 2d, 2e, 2f is rectangular. For example, the length of the second direction D2 of the element body 2 is 1.0 mm, the length of the first direction D1 of the element body 2 is 0.5 mm, and the length of the third direction D3 of the element body 2 is 0.5 mm. For example, the length of the second direction D2 of the element body 2 is 0.6 mm, the length of the first direction D1 of the element body 2 is 0.3 mm, and the length of the third direction D3 of the element body 2 is 0.3 mm.

[0023] In addition to being equal, the same may also be defined as values ​​that are within a predetermined range of slight differences or manufacturing errors, etc. For example, if a plurality of values ​​are within a range of ±5% of the average value of the plurality of values, the plurality of values ​​are defined as being equal.

[0024] The length of the first direction D1 of the element body 2 may be different from the length of the third direction D3 of the element body 2. For example, the length of the second direction D2 of the element body 2 may be 1.0 mm, the length of the first direction D1 of the element body 2 may be 0.5 mm, and the length of the third direction D3 of the element body 2 may be 0.7 mm. For example, the length of the second direction D2 of the element body 2 may be 0.6 mm, the length of the first direction D1 of the element body 2 may be 0.3 mm, and the length of the third direction D3 of the element body 2 may be 0.45 mm. The length of the second direction D2 of the element body 2 may be equal to the length of the first direction D1 of the element body 2 and the length of the third direction D3 of the element body 2.

[0025] A pair of end faces 2a, 2b extend in the first direction D1 in a manner connecting a pair of side faces 2c, 2d. A pair of end faces 2a, 2b also extend in the third direction D3 in a manner connecting a pair of side faces 2e, 2f. A pair of side faces 2c, 2d extend in the second direction D2 in a manner connecting a pair of end faces 2a, 2b. A pair of side faces 2c, 2d also extend in the third direction D3 in a manner connecting a pair of side faces 2e, 2f. A pair of side faces 2e, 2f extend in the first direction D1 in a manner connecting a pair of side faces 2c, 2d. A pair of side faces 2e, 2f also extend in the second direction D2 in a manner connecting a pair of end faces 2a, 2b.

[0026] The element body 2 is formed by stacking a plurality of insulating layers 10 (see Figure 3). That is, the element body 2 has a plurality of insulating layers 10 stacked in a first direction D1. The plurality of insulating layers 10 are stacked in a direction in which the side 2c and the side 2d are opposite to each other. That is, the stacking direction of the plurality of insulating layers 10 is consistent with the direction in which the side 2c and the side 2d are opposite to each other. Hereinafter, the direction in which the side 2c and the side 2d are opposite to each other is also referred to as the "stacking direction". Each insulating layer 10 is roughly rectangular in shape. In an actual element body 2, each insulating layer 10 is integrated to such an extent that the boundaries between the layers are not visible.

[0027] Each insulating layer 10 is formed of a sintered body of a ceramic green sheet containing a ferrite material (for example, a Ni—Cu—Zn ferrite material, a Ni—Cu—Zn—Mg ferrite material, or a Ni—Cu ferrite material).

[0028] In the laminated coil component 1, any of the side surfaces 2c, 2d, 2e, and 2f can constitute a mounting surface. The mounting surface is defined as a surface facing other electronic devices (e.g., a circuit board or an electronic component, etc.) when the laminated coil component 1 is mounted on other electronic devices (e.g., a circuit board or an electronic component, etc.) not shown.

[0029] A pair of external electrodes 4, 5 are arranged on a pair of end faces 2a, 2b. The pair of external electrodes 4, 5 are separated from each other in the relative direction (second direction D2) of the pair of end faces 2a, 2b. The pair of external electrodes 4, 5 are electrically connected to both ends of the first coil C1 and the second coil C2. The external electrode 4 is arranged on the end face 2a side of the element body 2, is electrically connected to one end of the first coil C1, and is electrically connected to one end of the second coil C2. The external electrode 5 is arranged on the end face 2b side of the element body 2, is electrically connected to the other end of the first coil C1, and is electrically connected to the other end of the second coil C2.

[0030] The external electrodes 4 and 5 include a conductive material (for example, Ag or Pd). The external electrodes 4 and 5 are formed as a sintered body of a conductive paste including conductive metal powder (for example, Ag powder or Pd powder) and glass powder. The external electrodes 4 and 5 are electroplated to form a plating layer on the surface. For example, Ni, Sn, etc. are used in the electroplating.

[0031] The external electrode 4 includes five electrode parts, namely, an electrode part 4a located on the end face 2a, an electrode part 4b located on the side face 2c, an electrode part 4c located on the side face 2d, an electrode part 4d located on the side face 2e, and an electrode part 4e located on the side face 2f. The electrode part 4a is connected to the electrode part 4b, the electrode part 4c, the electrode part 4d, and the electrode part 4e at the ridgeline of the element body 2 and are electrically connected to each other. The external electrode 4 is arranged at least on the end face 2a. The external electrode 4 is formed over five surfaces, namely, the end face 2a, a pair of side faces 2c, 2d, and a pair of side faces 2e, 2f. The electrode part 4a, the electrode part 4b, the electrode part 4c, the electrode part 4d, and the electrode part 4e are formed integrally.

[0032] The external electrode 5 includes five electrode portions, namely, an electrode portion 5a located on the end face 2b, an electrode portion 5b located on the side face 2c, an electrode portion 5c located on the side face 2d, an electrode portion 5d located on the side face 2e, and an electrode portion 5e located on the side face 2f. The electrode portion 5a is connected to the electrode portion 5b, the electrode portion 5c, the electrode portion 5d, and the electrode portion 5e at the ridgeline of the element body 2 and are electrically connected to each other. The external electrode 5 is arranged at least on the end face 2b. The external electrode 5 is formed over five surfaces, namely, the end face 2b, a pair of side faces 2c, 2d, and a pair of side faces 2e, 2f. The electrode portion 5a, the electrode portion 5b, the electrode portion 5c, the electrode portion 5d, and the electrode portion 5e are formed integrally.

[0033] Figure 2 It is shown Figure 1 A three-dimensional diagram of the internal structure of a laminated coil component. Figure 2 In the figure, the element body 2 and the external electrodes 4 and 5 are omitted. Figure 3 It is shown Figure 1 A side view of the internal structure of a laminated coil component. Figure 3 , the internal structure of the laminated coil component 1 as viewed from the end surface 2a side is shown. Figure 3 In FIG. 1 , the external electrodes 4 and 5 are omitted from illustration, and the element body 2 is indicated by a two-dot chain line.

[0034] like Figure 2 and Figure 3 As shown, the stacked coil component 1 includes a first coil C1 and a second coil C2. The first coil C1 and the second coil C2 are arranged in the element body 2. The first coil C1 has a coil axis A1 along the second direction D2. The second coil C2 has a coil axis A2 along the second direction D2. The coil axis A1 is arranged on the inner side of the spiral formed by the second coil C2. That is, it can be said that the area on the inner side of the spiral formed by the first coil C1 and the area on the inner side of the spiral formed by the second coil C2 have a mutually overlapping portion. The coil axis A2 is arranged on the inner side of the spiral formed by the first coil C1.

[0035] The first coil C1 has conductor layers 11 to 14 and through-hole conductors 21 to 23. The second coil C2 has conductor layers 15 to 18 and through-hole conductors 24 to 26. The laminated coil component 1 also includes a plurality of conductor layers 19 and a plurality of conductor layers 20 and through-hole conductors 27 and 28. The conductor layers 11 to 20 and the through-hole conductors 21 to 28 contain a conductive material (for example, Ag or Pd). The conductor layers 11 to 20 and the through-hole conductors 21 to 28 are formed as a sintered body of a conductive paste containing a conductive material (for example, Ag powder or Pd powder).

[0036] Figure 4 This is an exploded perspective view for explaining the current flowing through the first coil and the second coil. Figure 4 , conductor layers 11 to 18, a pair of conductor layers 20, and through-hole conductors 21 to 28 are shown. Figure 2 to Figure 4 As shown, the conductor layers 11, 13, 16, and 18 are arranged on the same insulating layer 10. That is, the conductor layers 11, 13, 16, and 18 are arranged at the same positions in the first direction D1. The conductor layers 12 and 17 are arranged on the same insulating layer 10. That is, the conductor layers 12 and 17 are arranged at the same positions in the first direction D1. The conductor layers 14, 15, and the plurality of conductor layers 19 are arranged on the same insulating layer 10. That is, the conductor layers 14, 15, and the plurality of conductor layers 19 are arranged at the same positions in the first direction D1. In this embodiment, the number of the conductor layers 19 is 4.

[0037] The insulating layer 10 including the conductor layers 12 and 17, the insulating layer 10 including the conductor layers 14 and 15 and the plurality of conductor layers 19, the insulating layer 10 including the plurality of conductor layers 20, and the insulating layer 10 including the conductor layers 11, 13, 16, and 18 are stacked in sequence in the first direction D1 from the side surface 2d. In the present embodiment, the insulating layer 10 including the plurality of conductor layers 20 is stacked in the first direction D1 in a three-layer structure. Eight conductor layers 20 are arranged for one insulating layer 10. The insulating layer 10 including the plurality of conductor layers 20 may be two or fewer layers or four or more layers.

[0038] The conductor layers 19 and 20 are rectangular in shape when viewed from the first direction D1. The conductor layer 20 is thinner than the conductor layers 11 to 19. The thickness (length in the first direction D1) of the conductor layer 20 is, for example, 30% or more and 70% or less of the thickness (length in the first direction D1) of the conductor layers 11 to 19. The thickness of the conductor layer 20 is, for example, 12 μm or more and 20 μm or less. The thickness of the conductor layers 11 to 19 is, for example, 28 μm or more and 40 μm or less. The thickness (length in the first direction D1) of the insulator layer 10 in which the plurality of conductor layers 20 are arranged is thinner than the thickness (length in the first direction D1) of the insulator layer 10 in which the conductor layers 11 to 19 are arranged.

[0039] The conductor layers 11 and 13 are arranged on one side (side 2c side) of the first direction D1 relative to the coil axis A1. The conductor layers 12 and 14 are arranged on the other side (side 2d side) of the first direction D1 relative to the coil axis A1. The conductor layers 16 and 18 are arranged on one side (side 2c side) of the first direction D1 relative to the coil axis A2. The conductor layers 15 and 17 are arranged on the other side (side 2d side) of the first direction D1 relative to the coil axis A2.

[0040] The conductor layers 11, 13, 16, and 18 are arranged on the side surface 2c side in the first direction D1 relative to the conductor layers 12, 14, 15, 17, 19, and 20. The conductor layers 12 and 17 are arranged on the side surface 2d side in the first direction D1 relative to the conductor layers 11, 13 to 16, and 18 to 20. The conductor layers 14 and 15 and the plurality of conductor layers 19 are arranged between the conductor layers 11, 13, 16, and 18 and the conductor layers 12 and 17 in the first direction D1. The plurality of conductor layers 20 are arranged between the conductor layers 11, 13, 16, and 18 and the conductor layers 14, 15 and the plurality of conductor layers 19 in the first direction D1.

[0041] Figure 5 2 is a plan view showing the positional relationship between the conductor layers 11 to 13 and 16 to 18 as viewed from the side surface 2c. Figure 5 In FIG. 1 , the element body 2 is represented by a double-dotted line. Figure 5 As shown in FIG. 1 , when viewed from the first direction D1, the conductor layer 12 and the conductor layer 16 intersect with each other. When viewed from the first direction D1, the conductor layer 13 and the conductor layer 17 intersect with each other. Figure 2 to Figure 4 As shown, the conductor layer 12 and the conductor layer 16 are separated from each other in the first direction D1. The conductor layer 13 and the conductor layer 17 are separated from each other in the first direction D1.

[0042] The via-hole conductors 21 to 28 penetrate the insulating layer 10 and extend in the first direction D1. The via-hole conductor 21 connects the conductor layer 11 and the conductor layer 12. The via-hole conductor 22 connects the conductor layer 12 and the conductor layer 13. The via-hole conductor 23 connects the conductor layer 13 and the conductor layer 14. The via-hole conductor 24 connects the conductor layer 15 and the conductor layer 16. The via-hole conductor 25 connects the conductor layer 16 and the conductor layer 17. The via-hole conductor 26 connects the conductor layer 17 and the conductor layer 18. The via-hole conductor 27 connects the conductor layer 11 and the conductor layer 15. The via-hole conductor 28 connects the conductor layer 14 and the conductor layer 18.

[0043] Each of the through-hole conductors 21 to 28 includes a plurality of conductor portions arranged along the first direction D1. The conductor portions adjacent to each other in the first direction D1 are connected to each other via the conductor layer 19 or the conductor layer 20. That is, the conductor layers 19 and 20 have the function of electrically connecting the conductor portions adjacent to each other in the first direction D1 through the through-hole conductors 21 to 28.

[0044] When viewed from the first direction D1, each conductor layer 19, 20 overlaps with any one of the via-hole conductors 21 to 28. Each via-hole conductor 21, 22, 25, 26 is formed by connecting five conductor portions through one conductor layer 19 and three conductor layers 20. The via-hole conductors 23, 24, 27, 28 are formed by connecting four conductor portions through three conductor layers 20.

[0045] Each conductor layer 20 overlapping the through-hole conductor 27 as viewed from the first direction D1 has an end portion exposed at the end surface 2a and connected to the electrode portion 4a, and is connected to the conductor layer 11 constituting one end of the first coil C1 and the conductor layer 15 constituting one end of the second coil C2 via the through-hole conductor 27. That is, the plurality of conductor layers 20 overlapping the through-hole conductor 27 as viewed from the first direction D1 electrically connect the first coil C1 and the second coil C2 to the external electrode 4 (see Figure 1 ).

[0046] Each conductor layer 20 overlapping the through-hole conductor 28 as viewed from the first direction D1 has an end portion exposed at the end surface 2b and connected to the electrode portion 5a, and is connected to the conductor layer 14 constituting the other end of the first coil C1 and the conductor layer 18 constituting the other end of the second coil C2 via the through-hole conductor 28. That is, the plurality of conductor layers 20 overlapping the through-hole conductor 28 as viewed from the first direction D1 electrically connect the first coil C1 and the second coil C2 to the external electrode 5 (see Figure 1 ).

[0047] Thus, the conductor layer 20 overlapping the through-hole conductors 27 and 28 when viewed from the first direction D1 has a function of electrically connecting the conductor portions adjacent to each other in the first direction D1 through the through-hole conductors 27 and 28, and also has a function of electrically connecting the first coil C1 and the second coil C2 to the pair of external electrodes 4 and 5. In the present embodiment, the conductor layer 20 overlapping the through-hole conductors 27 and 28 when viewed from the first direction D1 is led out to the end faces 2a and 2b, and therefore, the length in the second direction D2 is longer than that of the other conductor layers 20 overlapping the through-hole conductors 21 to 26, but may be equal thereto.

[0048] use Figure 4 , the current flowing through the first coil C1 and the second coil C2 is described. Figure 4 , the current is shown from the external electrode 4 (refer to Figure 1 ) flows through the first coil C1 and the second coil C2 to the external electrode 5 (refer to Figure 1 ) situation. Figure 4As shown, the current flows from the external electrode 4 into each conductor layer 20 whose end is connected to the electrode portion 4a, and then branches and flows into the conductor layer 11 constituting one end of the first coil C1 and the conductor layer 15 constituting one end of the second coil C2 through the through-hole conductor 27. The current flowing toward the first coil C1 through the through-hole conductor 27 is indicated by a single-dot chain line arrow. The current flowing toward the second coil C2 through the through-hole conductor 27 is indicated by a dotted line arrow.

[0049] The current flowing into the conductor layer 11 (the arrow indicated by the single-dotted line) flows into the conductor layer 12 through the through-hole conductor 21, then flows into the conductor layer 13 through the through-hole conductor 22, then flows into the conductor layer 14 through the through-hole conductor 23, and then flows into each conductor layer 20 whose end is connected to the electrode part 5a through the through-hole conductor 28.

[0050] The current flowing into the conductor layer 15 (arrow indicated by the dotted line) flows into the conductor layer 16 through the through-hole conductor 24, then flows into the conductor layer 17 through the through-hole conductor 25, then flows into the conductor layer 18 through the through-hole conductor 26, and then flows into each conductor layer 20 whose end is connected to the electrode part 5a through the through-hole conductor 28.

[0051] The current flowing through the first coil C1 and the current flowing through the second coil C2 flow through the through-hole conductor 28, merge at the conductor layers 20 connected to the electrode portion 5a at the end, and flow into the external electrode 5. The current may also flow from the external electrode 5 to the external electrode 4 through the first coil C1 and the second coil C2. In this case, Figure 4 The directions of the arrows shown are all changed to opposite directions.

[0052] As described above, in the laminated coil component 1, the coil axis A1 of the first coil C1 and the coil axis A2 of the second coil C2 are consistent with the relative direction of the pair of end faces 2a and 2b, that is, the second direction D2. Therefore, the stray capacitance formed between the external electrodes 4 and 5 and the first coil C1, and the stray capacitance formed between the external electrodes 4 and 5 and the second coil C2 can be reduced respectively. As a result, the self-resonant frequency (SRF) of the laminated coil component 1 is suppressed from becoming lower, and the high-frequency characteristics are improved.

[0053] The first coil C1 and the second coil C2 are electrically connected in parallel between the pair of external electrodes 4 and 5. Therefore, the DC resistance of the laminated coil component 1 can be reduced.

[0054] The coil axis A1 of the first coil C1 is arranged on the inner side of the second coil C2. In addition, the conductor layer 12 and the conductor layer 16 are separated from each other in the first direction D1, and cross each other when viewed from the first direction D1. With such a structure, the first coil C1 and the second coil C2 can form a large spiral while crossing each other. Therefore, the inner diameter of the first coil C1 and the second coil C2 can be increased. As a result, the inductance can be increased.

[0055] By making the spirals of the first coil C1 and the second coil C2 intersect, the length of the first coil C1 and the second coil C2 in the second direction D2 can be shortened while maintaining the number of turns of the first coil C1 and the second coil C2, compared with the case where the spirals are not intersected. Therefore, it is possible to suppress the degradation of the characteristics caused by the lengthening of the magnetic circuits of the first coil C1 and the second coil C2. In addition, the miniaturization of the stacked coil component 1 can be achieved.

[0056] The conductor layer 13 and the conductor layer 17 are separated from each other in the first direction D1 and intersect each other when viewed from the first direction D1. Thus, the first coil C1 and the second coil C2 can increase the number of turns while intersecting each other.

[0057] The conductor layer 12 and the conductor layer 17 are arranged at the same position in the first direction D1. Therefore, it is easy to further increase the inner diameter of the first coil C1 and the inner diameter of the second coil C2. In addition, the conductor layer 13 and the conductor layer 16 are arranged at the same position in the first direction D1. Therefore, it is easy to further increase the inner diameter of the first coil C1 and the second coil C2.

[0058] The first coil C1 and the second coil C2 are electrically connected to a pair of external electrodes 4 and 5 through a plurality of conductor layers 20. The resistance of the plurality of conductor layers 20 is inversely proportional to the sum of the cross-sectional areas of the plurality of conductor layers 20. Therefore, the greater the number of conductor layers 20, the lower the resistance of the plurality of conductor layers 20. Therefore, the resistance can be reduced compared to the case where the conductor layer 20 is a single layer.

[0059] The thickness of each conductor layer 20 is thinner than that of the conductor layers 11 to 19. Therefore, in the step of cutting the laminate substrate to separate the element body into two pieces, the laminate substrate can be easily cut together with the plurality of conductor layers 20. Therefore, the end portions of the conductor layers 20 can be easily exposed at the end faces 2a and 2b.

[0060] The plurality of conductor layers 20 are arranged between the conductor layer 12 and the conductor layer 13 in the first direction D1, and are arranged between the conductor layer 16 and the conductor layer 17 in the first direction D1. Therefore, by increasing the number of conductor layers 20, the inner diameters of the first coil C1 and the second coil C2 can be easily enlarged in the first direction D1. Thus, the inductance can be increased.

[0061] As mentioned above, although embodiment was described, this invention is not necessarily limited to the said embodiment, Various changes are possible within the range which does not deviate from the summary.

[0062] The conductor layers 11, 13, 16, and 18 are arranged at the same positions in the first direction D1, but may be arranged at different positions in the first direction D1. In addition, the conductor layers 12 and 17 and the conductor layers 14 and 15 are arranged at different positions in the first direction D1, but may be arranged at the same position in the first direction D1.

[0063] The first coil C1 may also be a structure in which a loop consisting of the conductor layer 12, the through-hole conductor 22, the conductor layer 13, and the through-hole conductor 23 is repeated multiple times. That is, the first coil C1 may have multiple loops consisting of the conductor layer 12, the through-hole conductor 22, the conductor layer 13, and the through-hole conductor 23 between the conductor layer 11 and the conductor layer 14 in the second direction D2. In this way, the number of turns of the first coil C1 can be increased.

[0064] The second coil C2 may also be a structure in which a loop consisting of the conductor layer 16, the through-hole conductor 25, the conductor layer 17, and the through-hole conductor 26 is repeated multiple times. That is, in the second coil C2, a plurality of loops consisting of the conductor layer 16, the through-hole conductor 25, the conductor layer 17, and the through-hole conductor 26 may be provided between the conductor layer 15 and the conductor layer 18 in the second direction D2. Thus, the number of turns of the second coil C2 can be increased.

Claims

1. A laminated coil component, characterized in that: have: A body, in which a plurality of insulating layers are stacked in a first direction and has a pair of end faces facing each other in a second direction orthogonal to the first direction; A first coil and a second coil, which are disposed in the body and each have a coil axis along the second direction; a pair of external electrodes disposed on the pair of end surfaces and electrically connected to both ends of the first coil and the second coil; as well as a plurality of fifth conductor layers stacked in the first direction and electrically connecting the first coil and the second coil to the external electrode, The first coil includes a first conductor layer, a second conductor layer, and a first through-hole conductor extending in the first direction and connecting the first conductor layer and the second conductor layer. The second coil includes a third conductor layer, a fourth conductor layer, and a second through-hole conductor extending in the first direction and connecting the third conductor layer and the fourth conductor layer. The coil axis of the first coil is arranged inside the second coil, The first conductor layer and the third conductor layer are separated from each other in the first direction and intersect each other when viewed from the first direction. The first coil further includes: a sixth conductor layer, which is arranged between the first conductor layer and the second conductor layer in the first direction and serves as one end of the first coil. The plurality of fifth conductor layers are arranged between the sixth conductor layer and the third conductor layer in the first direction.

2. The laminated coil component according to claim 1, wherein: The second conductor layer and the fourth conductor layer are separated from each other in the first direction and intersect each other when viewed from the first direction.

3. The laminated coil component according to claim 1 or 2, characterized in that: The first conductor layer and the fourth conductor layer are arranged at the same positions as each other in the first direction.

4. The laminated coil component according to claim 1 or 2, characterized in that: The second conductor layer and the third conductor layer are arranged at the same positions as each other in the first direction.

5. The laminated coil component according to claim 1, wherein: The thickness of each of the fifth conductor layers is thinner than the thickness of the first conductor layer, the thickness of the second conductor layer, the thickness of the third conductor layer, and the thickness of the fourth conductor layer.

6. The laminated coil component according to claim 1, wherein: The plurality of fifth conductor layers are arranged between the first conductor layer and the second conductor layer in the first direction, and are arranged between the third conductor layer and the fourth conductor layer in the first direction.

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