Inductor component and inductor component mounting substrate

Abstract

The present invention provides an inductor component that reduces the situation that hinders miniaturization. Inside the magnetic layer (40), a first columnar wiring (51) is connected to the first end of the first inductor wiring (20A), that is, the first pad (22A). The first columnar wiring (51) passes through the third magnetic layer (43). A second columnar wiring (52) is connected to the second end of the first inductor wiring (20A), that is, the second pad (23). The second columnar wiring (52) passes through the third magnetic layer (43). A third columnar wiring (53) is connected to the first end of the second inductor wiring (20B), that is, the first pad (22B). The third columnar wiring (53) passes through the third magnetic layer (43) and is exposed on the outer surface of the magnetic layer (40). The second end of the second inductor wiring (20B) is the second pad (23). A second columnar wiring (52) is connected to a second pad (23) at the second end of the first inductor wiring (20A) and also serves as the second end of the second inductor wiring (20B).

Description

Technical Field

[0001] The present invention relates to an inductor component and an inductor component mounting substrate. Background Art

[0002] The inductor component described in Patent Document 1 has three inductor wirings. Each inductor wiring is arranged inside the magnetic layer. An external terminal is connected to the first end in the extending direction of the inductor wiring. Similarly, an external terminal is connected to the second end on the side opposite to the first end in the extending direction of the inductor wiring. As a result, a total of six external terminals are arranged on the outer surface of the inductor component.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2013-211330

[0004] In the inductor component described in Patent Document 1, the number of external terminals corresponding to the number of both ends of each inductor wiring is provided. Therefore, for example, it is necessary to design so that a corresponding number of external terminals are arranged on the surface of the inductor component while taking into account the wiring and terminal positions on the substrate on which the inductor component is mounted. Therefore, it is undeniable that the greater the number of external terminals, the lower the degree of freedom in designing the inductor component, which may cause problems such as hindering the miniaturization of the inductor component. Summary of the invention

[0005] In order to solve the above-mentioned problems, one form of the inductor component disclosed in the present invention is an inductor component, which comprises: a first inductor wiring and a second inductor wiring, which are arranged inside the magnetic layer, and the current flows in the same direction between the first end on one side of the extension direction and the second end on the other side; a first vertical wiring, which is connected to the above-mentioned first end of the above-mentioned first inductor wiring, penetrates the above-mentioned magnetic layer and is exposed on the outer surface of the above-mentioned magnetic layer; a second vertical wiring, which is connected to the above-mentioned second end of the above-mentioned first inductor wiring, penetrates the above-mentioned magnetic layer and is exposed on the outer surface of the above-mentioned magnetic layer; and a third vertical wiring, which is connected to the above-mentioned first end of the above-mentioned second inductor wiring, penetrates the above-mentioned magnetic layer and is exposed on the outer surface of the above-mentioned magnetic layer, and the above-mentioned second vertical wiring is connected to the above-mentioned second end of the above-mentioned second inductor wiring.

[0006] In order to solve the above-mentioned problems, one form of an inductor component mounting substrate disclosed in the present invention is an inductor component mounting substrate including an inductor component and a substrate on which the inductor component is mounted.

[0007] The inductor component comprises: a first inductor wiring and a second inductor wiring, which are arranged inside the magnetic layer, and current flows in the same direction between a first end on one side and a second end on the other side in the extension direction; a first vertical wiring connected to the first end of the first inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; a second vertical wiring connected to the second end of the first inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; and a third vertical wiring connected to the first end of the second inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer, and the second vertical wiring is connected to the second end of the second inductor wiring, and the substrate comprises: a first input wiring to which an input voltage is applied; a second input wiring to which the input voltage is applied; and an output wiring to which an output voltage lower than the input voltage is applied, the first input wiring being connected to the first vertical wiring, the second input wiring being connected to the third vertical wiring, and the output wiring being connected to the second vertical wiring.

[0008] According to the above configurations, a common second vertical wiring is connected to the second end of the inductor wiring. Therefore, the number of second vertical wirings is smaller than that in the case where the second ends of a plurality of inductor wirings are respectively connected to the second ends. Therefore, in designing the inductor component, the number of second vertical wirings exposed to the outside can be set smaller, thereby improving the degree of design freedom and reducing the obstacles to miniaturization of the inductor component.

[0009] In order to solve the above-mentioned problems, one form of the inductor component disclosed in the present invention is an inductor component, which comprises: a first inductor wiring and a second inductor wiring, which are arranged inside the magnetic layer, and the current flows in the same direction between the first end on one side of the extension direction and the second end on the other side; a first vertical wiring, which is connected to the first end of the first inductor wiring, penetrates the magnetic layer and is exposed on the outer surface of the magnetic layer; a second vertical wiring, which is connected to the second end of the first inductor wiring, penetrates the magnetic layer and is exposed on the outer surface of the magnetic layer; a third vertical wiring, which is connected to the second end of the first inductor wiring, penetrates the magnetic layer and is exposed on the outer surface of the magnetic layer; The above-mentioned first end of the wiring passes through the above-mentioned magnetic layer and is exposed on the outer surface of the above-mentioned magnetic layer; the fourth vertical wiring is connected to the above-mentioned second end of the above-mentioned second inductor wiring, passes through the above-mentioned magnetic layer and is exposed on the outer surface of the above-mentioned magnetic layer; the first external terminal is connected to the portion of the above-mentioned first vertical wiring exposed on the outer surface of the above-mentioned magnetic layer; the second external terminal is connected to the portion of the above-mentioned second vertical wiring exposed on the outer surface of the above-mentioned magnetic layer; and the third external terminal is connected to the portion of the above-mentioned third vertical wiring exposed on the outer surface of the above-mentioned magnetic layer, and the above-mentioned second external terminal is connected to the above-mentioned fourth vertical wiring.

[0010] In order to solve the above-mentioned problems, one form of the inductor component mounting substrate disclosed in the present invention is an inductor component mounting substrate, which is an inductor component mounting substrate comprising an inductor component and a substrate for mounting the inductor component, wherein the inductor component comprises: a first inductor wiring and a second inductor wiring, which are arranged inside a magnetic layer, and current flows in the same direction between a first end on one side of an extension direction and a second end on the other side; a first vertical wiring, which is connected to the first end of the first inductor wiring, penetrates the magnetic layer and is exposed on the outer surface of the magnetic layer; a second vertical wiring, which is connected to the second end of the first inductor wiring, penetrates the magnetic layer and is exposed on the outer surface of the magnetic layer; a third vertical wiring, which is connected to the first end of the second inductor wiring, penetrates the magnetic layer and is exposed on the outer surface of the magnetic layer, and a fourth vertical wiring, which is connected to the first end of the second inductor wiring, penetrates the magnetic layer and is exposed on the outer surface of the magnetic layer The second end of the second inductor wiring penetrates the magnetic layer and is exposed on the outer surface of the magnetic layer; the first external terminal is connected to the portion of the first vertical wiring exposed on the outer surface of the magnetic layer; the second external terminal is connected to the portion of the second vertical wiring exposed on the outer surface of the magnetic layer; and the third external terminal is connected to the portion of the third vertical wiring exposed on the outer surface of the magnetic layer, and the second external terminal is connected to the fourth vertical wiring, and the substrate comprises: a first input wiring, to which an input voltage is applied; a second input wiring, to which the input voltage is applied; and an output wiring, to which an output voltage lower than the input voltage is applied, the first input wiring is connected to the first external terminal, the second input wiring is connected to the third external terminal, and the output wiring is connected to the second external terminal.

[0011] According to the above-mentioned structures, the second vertical wiring connected to the second end of the inductor wiring is connected to a common second external terminal. Therefore, compared with the case where the second external terminals are respectively connected to a plurality of second vertical wirings, the number of second external terminals is smaller. Therefore, in designing the inductor component, the number of second external terminals can be set to be smaller, so the degree of design freedom is improved, and the situation that hinders the miniaturization of the inductor component is reduced.

[0012] Therefore, the present invention can suppress the obstruction of miniaturization of the inductor component. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an exploded perspective view of the inductor component according to the first embodiment.

[0014] Figure 2 This is a transparent plan view of the inductor component according to the first embodiment.

[0015] Figure 3It is an exploded perspective view of the inductor component according to the second embodiment.

[0016] Figure 4 This is a transparent plan view of the inductor component according to the second embodiment.

[0017] Figure 5 It is an exploded perspective view of the inductor component according to the third embodiment.

[0018] Figure 6 This is a transparent plan view of the inductor component according to the third embodiment.

[0019] Figure 7 It is an exploded perspective view of the inductor component according to the fourth embodiment.

[0020] Figure 8 This is a transparent plan view of the inductor component according to the fourth embodiment.

[0021] Fig. 9 It is a cross-sectional view of an inductor component according to a fourth embodiment.

[0022] Fig.10 It is a cross-sectional view of an embodiment of an inductor component mounting substrate.

[0023] Fig.11 It is a transparent plan view of the inductor component of the modification example.

[0024] Description of reference numerals:

[0025] 10…Inductor component; 20…Inductor wiring; 20A…1st inductor wiring; 20B…2nd inductor wiring; 20C…3rd inductor wiring; 21…Wiring body; 22…1st pad; 23…2nd pad; 30…Dummy wiring; 40…Magnetic layer; 41…1st magnetic layer; 42…2nd magnetic layer; 43…3rd magnetic layer; 51…1st columnar wiring; 52…2nd columnar wiring; 53…3rd columnar wiring; 54…4th columnar wiring; L1…1st layer; L2…2nd layer; L3…3rd layer; θ…Angular spacing; VL1…1st imaginary straight line; VL2…2nd imaginary straight line; 110…Inductor component; 120…Inductor wiring; 120A…1st inductor wiring; 120B…2nd inductor wiring; 1 20C…3rd inductor wiring; 121…wiring body; 121A…outer wiring body; 121B…inner wiring body; 122…1st pad; 123…2nd pad; 130…dummy wiring; 140…magnetic layer; 141…1st magnetic layer; 142…2nd magnetic layer; 143…3rd magnetic layer; 151…1st columnar wiring; 152…2nd columnar wiring; 153…3rd columnar wiring; 154…4th columnar wiring; L11…1st layer; L12…2nd layer; L13…3rd layer; ID…1st pad-to-pad distance; 210…inductor component; 220A…1st inductor wiring; 220B…2nd inductor wiring; 221A…1st wiring body; 221B…2nd wiring body; 222 A…1st pad; 222B…1st pad; 223A…2nd pad; 223B…2nd pad; 230A…dummy wiring; 230B…dummy wiring; 240…magnetic layer; 241…1st magnetic layer; 242…2nd magnetic layer; 243…3rd magnetic layer; 244…4th magnetic layer; 245…5th magnetic layer; 246…6th magnetic layer; 247…7th magnetic layer; 251…1st through hole; 252…2nd through hole; 253…3rd through hole; 254…4th through hole; 255…5th through hole; 256…6th through hole; 257…1st columnar wiring; 258…2nd columnar wiring; 259…3rd columnar wiring; 261…1st layer connection wiring; 262…3rd layer connection wiring; 27 0…insulating portion; 271…1st insulating portion; 272…2nd insulating portion; 273…3rd insulating portion; 274…4th insulating portion; 275…5th insulating portion; L21…1st layer; L22…2nd layer; L23…3rd layer; L24…4th layer; L25…5th layer; L26…6th layer; L27…7th layer; 310…inductor component; 320…inductor wiring; 320A…1st inductor wiring; 320B…2nd inductor wiring; 321…wiring body; 322…1st pad; 323…2nd pad; 330…dummy wiring; 340…magnetic layer; 341…1st magnetic layer; 342…2nd magnetic layer; 343…3rd magnetic layer; 344…4th magnetic layer; 345…5th magnetic layer;351…1st columnar wiring; 352…2nd columnar wiring; 353…3rd columnar wiring; 371…1st insulating portion; 372…2nd insulating portion; 373…3rd insulating portion; 381…1st through hole; 382…2nd through hole; 383…3rd through hole; 384…4th through hole; 385…5th through hole; 386…6th through hole; 391…1st external terminal; 392…2nd external terminal; 393…3rd external terminal; 394…4th external terminal; 395…5th external terminal; 396 ...coating layer; 397...coating layer; L31...1st layer; L32...2nd layer; L33...3rd layer; L34...4th layer; L35...5th layer; L36...6th layer; L37...7th layer; 400...inductor mounting substrate; 410...substrate; 420...input wiring; 420A...1st input wiring; 420B...2nd input wiring; 430...output wiring; 510...inductor; 520...inductor wiring; 521...wiring body; 522...1st pad; 523...2nd pad. ; DETAILED DESCRIPTION

[0026] <Embodiment of Inductor Component>

[0027] The following describes various embodiments of the inductor component. In addition, the drawings may enlarge and show components for ease of understanding. The dimensional ratios of the components may differ from the actual ratios or from the ratios in other drawings. In addition, although hatching is drawn in the cross-sectional view, hatching of a part of the components may be omitted for ease of understanding.

[0028] <First embodiment>

[0029] Hereinafter, a first embodiment of the inductor component will be described.

[0030] like Figure 1 As shown in FIG. 1 , the inductor component 10 as a whole has a structure in which three thin plate-like layers are stacked in the thickness direction. In the following description, the stacking direction in which the three layers are stacked is described as the up-down direction. Figure 2 The center is the direction perpendicular to the paper surface.

[0031] The first layer L1 is composed of four inductor wirings 20, four dummy wirings 30, and a first magnetic layer 41. The first layer L1 is substantially square in plan view. The four inductor wirings 20 are composed of a first inductor wiring 20A, a second inductor wiring 20B, and two third inductor wirings 20C. In addition, the inductor wiring 20 is composed of a wiring body 21 having a substantially constant line width, a first pad 22 connected to the first end of the wiring body 21, and a second pad 23 connected to the second end of the wiring body 21. In the present embodiment, the first pad 22 is the first end of the inductor wiring 20, and the second pad 23 is the second end of the inductor wiring 20.

[0032] For each inductor wiring 20, the current flows from the first pad 22 to the second pad 23. That is, the current flows in the same direction between the first end on one side and the second end on the other side of the extending direction of the inductor wiring 20. In this embodiment, for the four inductor wirings 20, the current flows from the first end to the second end.

[0033] like Figure 2 As shown, in the first layer L1 , the first wiring body 21A of the first inductor wiring 20A is bent and extended from a first end near a corner of the square-shaped first layer L1 toward a second end near the center of the square in a plan view.

[0034] A first pad 22A is connected to a first end on one side in the extending direction of the first wiring body 21A. The first pad 22A is circular in shape when viewed from above. The first pad 22A has a wider wiring width than the first wiring body 21A connected to the first pad 22A. The first pad 22A is arranged near a corner of the first layer L1 which is square in shape when viewed from above.

[0035] A second pad 23 is connected to the second end on the other side in the extension direction of the first wiring body 21A. The second pad 23 is circular in a plan view. In addition, the wiring bodies 21 of the four inductor wirings 20 are all of the same shape and have the same length in the extension direction. The same reference numerals are used to mark the structures of the wiring bodies 21, and description thereof is omitted.

[0036] The first end of the second wiring body 21B of the second inductor wiring 20B is arranged near a corner adjacent to the first pad 22A arranged with the first inductor wiring 20A in the clockwise direction of the four corners of the first layer L1 in a square shape in a plan view. The second wiring body 21B is bent and extended from the first end toward the second end near the center of the square first layer L1 in a plan view.

[0037] The first pad 22B is connected to the first end on one side in the extending direction of the second wiring body 21B. The first pad 22B is circular in a top view from the top and bottom directions. The first pad 22B has a wider wiring width than the second wiring body 21B connected to the first pad 22B. The first pad 22B is arranged in the vicinity of a corner of the first layer L1 which is square in a top view and is adjacent to the corner where the first pad 22A is arranged in the clockwise direction in a top view.

[0038] The second pad 23 is connected to the second end on the other side in the extending direction of the second wiring body 21B. That is, the second pad 23 is the second end of the first inductor wiring 20A and the second end of the second inductor wiring 20B.

[0039] The third wiring body 21C has first ends disposed in the vicinity of the remaining two corners of the first layer L1 which is a square in plan view and where the first inductor wiring 20A and the second inductor wiring 20B are not disposed. The third wiring body 21C is bent and extended from the first end toward the second end near the center of the first layer L1 which is a square in plan view.

[0040] The first pads 22C are connected to the first ends of the third wiring body 21C on one side in the extending direction. The first pads 22C are circular in shape when viewed from the top and bottom. The first pads 22C have a wider wiring width than the third wiring body 21C connected to the first pads 22C. Each first pad 22C is arranged near the corner of the first layer L1 which is square in shape when viewed from the top.

[0041] The second pad 23 is connected to the second end on the other side in the extending direction of the third wiring body 21C. That is, the second pad 23 is the second end of the first inductor wiring 20A and is also the second end of the two third inductor wirings 20C.

[0042] Therefore, in plan view, the second pad 23, which is the second end of each inductor wiring 20, is located closer to the center of the first layer L1 than the first pad 22 of any inductor wiring 20.

[0043] The second ends of the four wiring bodies 21 are connected to the outer edge of the second pad 23. That is, the second ends of the four wiring bodies 21 are arranged at equal intervals along the outer peripheral surface of the second pad 23. Therefore, when the first layer L1 is viewed from above, the second ends of the four inductor wirings 20 extend radially around the second pad 23.

[0044] Here, a virtual straight line connecting the second end of the first inductor wiring 20A, i.e., the center of the second pad 23, to the center of the second end of the first wiring body 21A of the first inductor wiring 20A in the wiring width direction is set as a first virtual straight line VL1. In addition, a virtual straight line connecting the second end of the second wiring body 21B of the second inductor wiring 20B, i.e., the center of the second pad 23, to the center of the second end of the second inductor wiring 20B in the wiring width direction is set as a second virtual straight line VL2. In addition, a virtual straight line connecting the second end of the third inductor wiring 20C, i.e., the center of the second pad 23, to the center of the second end of the third wiring body 21C of the third inductor wiring 20C in the wiring width direction is set as a third virtual straight line VL3. At this time, the angle formed by the first virtual straight line VL1 and the second virtual straight line VL2, i.e., the wiring angle, is 90 degrees. In addition, the angles formed by two adjacent virtual straight lines are equal to each other, i.e., 90 degrees. In other words, the angular pitch θ between adjacent inductor wirings 20 in the radially extending portion of each inductor wiring 20 is 90 degrees, and when the number of inductor wirings 20 is N, the angular pitch θ satisfies 360 / 2N<θ<360 / 0.5N.

[0045] The number of turns of the inductor wiring 20 is set to 1.0 turns when the inductor wiring 20 moves 360 degrees from one end of the inductor wiring 20 to the other end of the inductor wiring 20 in the extending direction of the inductor wiring 20. That is, the number of turns of the inductor wiring 20 indicates the winding angle of the inductor wiring 20 by the number of turns. Therefore, for example, when the winding is 180 degrees, the number of turns is 0.5 turns. In the present embodiment, the winding angle of each inductor wiring 20 is 180 degrees. Therefore, the number of turns of the inductor wiring 20 is 0.5 turns in the present embodiment.

[0046] The inductor wiring 20 is made of a conductive material. In the present embodiment, the composition of the inductor wiring 20 is as follows: the ratio of copper is 99 wt % or more, and the ratio of sulfur is 0.1 wt % or more and less than 1.0 wt %.

[0047] A dummy wiring 30 is connected to the first pad 22 of each inductor wiring 20. The dummy wiring 30 extends from a portion of the first pad 22 on the side opposite to the wiring body 21 to the side surface of the first layer L1 in the first layer L1, and is exposed on the outer surface of the inductor component 10. The material of the dummy wiring 30 is the same as that of the inductor wiring 20. That is, the composition of the dummy wiring 30 is: the ratio of copper is 99wt% or more, and the ratio of sulfur is 0.1wt% or more and less than 1.0wt%. In addition, the inductor wiring 20 and the dummy wiring 30 are integrated.

[0048] In the first layer L1, the portion other than the inductor wirings 20 and the dummy wirings 30 is the first magnetic layer 41. The first magnetic layer 41 is composed of a mixture of resin and metal magnetic powder. That is, the first magnetic layer 41 is a magnetic body. Figure 2 In FIG. 1 , the first columnar wiring 51, the second columnar wiring 52, the third columnar wiring 53, and the fourth columnar wiring 54 described later are indicated by double-dashed lines. In addition, the dimension of the inductor wiring 20 in the stacking direction is the same as the dimension of the dummy wiring 30 in the stacking direction, and the dimension of the inductor wiring 20 in the stacking direction is the same as the dimension of the first layer L1 in the stacking direction.

[0049] like Figure 1 As shown, a second layer L2 having a square shape in a plan view similar to the first layer L1 is stacked on the lower surface of the first layer L1. The second layer L2 is a second magnetic layer 42. Therefore, the second magnetic layer 42 is stacked on the lower surface of the inductor wiring 20. The second magnetic layer 42 is composed of a mixture of resin and metal powder, and is therefore a magnetic body similar to the first magnetic layer 41.

[0050] The third layer L3 having a square shape in plan view similar to the first layer L1 is stacked on the upper surface of the first layer L1. The third layer L3 includes a first columnar wiring 51, a second columnar wiring 52, a third columnar wiring 53, two fourth columnar wirings 54, and a third magnetic layer 43.

[0051] The first columnar wiring 51 penetrates the third magnetic layer 43 in the stacking direction and is connected to the upper surface of the first pad 22A of the first inductor wiring 20A. The material of the first columnar wiring 51 is the same material as that of the first inductor wiring 20A. In addition, the first columnar wiring 51 is integrated with the first inductor wiring 20A. The first columnar wiring 51 is cylindrical, and the axial direction of the cylinder is consistent with the stacking direction. The dimension of the first columnar wiring 51 in the stacking direction is the same as the dimension of the third layer L3 in the stacking direction. Therefore, the upper surface of the first columnar wiring 51 is exposed on the upper surface of the third layer L3. When viewed from above, the diameter of the circular first columnar wiring 51 is slightly smaller than the diameter of the first pad 22A. In the present embodiment, the first columnar wiring 51 is the first vertical wiring.

[0052] The third columnar wiring 53 penetrates the third magnetic layer 43 in the stacking direction and is connected to the upper surface of the first pad 22B of the second inductor wiring 20B. The material of the third columnar wiring 53 is the same as that of the second inductor wiring 20B. In addition, the third columnar wiring 53 is integrated with the second inductor wiring 20B. The third columnar wiring 53 is cylindrical, and the axial direction of the cylinder is consistent with the stacking direction. The dimension of the third columnar wiring 53 in the stacking direction is the same as the dimension of the third layer L3 in the stacking direction. Therefore, the upper surface of the third columnar wiring 53 is exposed on the upper surface of the third layer L3. When viewed from above, the diameter of the circular third columnar wiring 53 is slightly smaller than the first pad 22B. In the present embodiment, the third columnar wiring 53 is a third vertical wiring.

[0053] The fourth columnar wiring 54 penetrates the third magnetic layer 43 in the stacking direction and is connected to the upper surface of the first pad 22C of the third inductor wiring 20C. The material of the fourth columnar wiring 54 is the same as that of the third inductor wiring 20C. In addition, the fourth columnar wiring 54 is integrated with the third inductor wiring 20C. The fourth columnar wiring 54 is cylindrical, and the axial direction of the cylinder is consistent with the stacking direction. In this embodiment, the fourth columnar wiring 54 is a fourth vertical wiring. In addition, one fourth columnar wiring 54 is arranged on each upper side of the two first pads 22C.

[0054] The second columnar wiring 52 penetrates the third magnetic layer 43 in the stacking direction and is connected to the upper surface of the second pad 23. The material of the second columnar wiring 52 is the same as that of the first inductor wiring 20A. The second columnar wiring 52 is cylindrical, and the axial direction of the cylinder is consistent with the stacking direction. The dimension of the second columnar wiring 52 in the stacking direction is the same as the dimension of the third layer L3 in the stacking direction. Therefore, the upper surface of the second columnar wiring 52 is exposed on the upper surface of the third layer L3. When viewed from above, the diameter of the circular second columnar wiring 52 is slightly smaller than the diameter of the second pad 23. In the present embodiment, the second columnar wiring 52 is a second vertical wiring.

[0055] As described above, the second pad 23 is the second end of the first inductor wiring 20A, the second end of the second inductor wiring 20B, and the second end of the third inductor wiring 20C. Therefore, the second columnar wiring 52 is connected to the second pad 23, which is the second end of the four inductor wirings 20.

[0056] In the third layer L3, the portion other than the first columnar wiring 51, the second columnar wiring 52, the third columnar wiring 53, and the fourth columnar wiring 54 is the third magnetic layer 43. Therefore, the third magnetic layer 43 is stacked on the upper surface of the inductor wiring 20. The third magnetic layer 43 is composed of a mixture of resin and metal magnetic powder, and is therefore a magnetic body like the first magnetic layer 41 and the second magnetic layer 42 described above.

[0057] In the inductor component 10, the magnetic layer 40 is composed of a first magnetic layer 41, a second magnetic layer 42, and a third magnetic layer 43. The first magnetic layer 41, the second magnetic layer 42, and the third magnetic layer 43 are connected to surround the inductor wiring 20. In this way, the magnetic layer 40 forms a closed magnetic path with respect to the inductor wiring 20. In addition, although the first magnetic layer 41, the second magnetic layer 42, and the third magnetic layer 43 are shown separately, they are integrated as the magnetic layer 40.

[0058] Next, the operation and effects of the first embodiment described above will be described.

[0059] (1) According to the first embodiment, the second end of the first inductor wiring 20A, that is, the second pad 23, is also the second end of the second inductor wiring 20B. In addition, one second columnar wiring 52 is connected to the second pad 23. Therefore, compared with the case where the second ends of the four inductor wirings 20 are connected to separate vertical wirings, the number of vertical wirings is smaller. Therefore, in designing the inductor component 10, the number of vertical wirings exposed to the outside can be set to be smaller, so the degree of design freedom is improved, for example, the situation that hinders the miniaturization of the inductor component 10 is reduced.

[0060] (2) According to the first embodiment, each inductor wiring 20 including not only the wiring body 21 but also the second pad 23 is arranged in the same first layer L1. Therefore, compared with the case where each inductor wiring 20 is arranged in a different layer, the size of the inductor component 10 as a whole in the stacking direction can be reduced.

[0061] (3) According to the first embodiment, the lengths of the wiring bodies 21 of the inductor wirings 20 are equal. Therefore, when the same current flows through the inductor wirings 20, the inductances obtained are likely to be equal. Similarly, since the lengths of the wiring bodies 21 of the inductor wirings 20 are equal, the DC resistances of the inductor wirings 20 are likely to be equal.

[0062] (4) According to the first embodiment, the number of turns of each inductor wiring 20 is less than 1.0 turn. Therefore, the DC resistance of the inductor wiring 20 can be reduced, so a relatively large current can flow. In addition, since the number of turns of the inductor wiring 20 is small, the ratio of the volume of the inductor wiring 20 to the overall volume of the inductor component 10 can be reduced. Therefore, by increasing the ratio of the volume of the magnetic layer 40, it is less likely to hinder the reduction of the inductance acquisition rate relative to the overall volume of the inductor component 10.

[0063] <Second embodiment>

[0064] The second embodiment of the inductor component will be described below. The second embodiment described below is mainly different from the inductor component 10 of the first embodiment in the shape and arrangement of the inductor wiring. Figure 4 The center is the direction perpendicular to the paper surface.

[0065] like Figure 3 As shown in FIG. 1 , the inductor component 110 as a whole has a structure in which three thin plate-like layers are stacked in the thickness direction. In the following description, the stacking direction in which the three layers are stacked is described as the up-down direction.

[0066] like Figure 4 As shown, the first layer L11 is composed of four inductor wirings 120, one dummy wiring 130, and a first magnetic layer 141. The first layer L11 is roughly rectangular in a plan view. The four inductor wirings 120 are composed of a first inductor wiring 120A, a second inductor wiring 120B, and two third inductor wirings 120C. The inductor wiring 120 is composed of a wiring body 121 with a substantially constant line width, a first pad 122 connected to the first end of the wiring body 121, and a second pad 123 connected to the second end of the wiring body 121. In this embodiment, the first pad 122 is the first end of the inductor wiring 120, and the second pad 123 is the second end of the inductor wiring 120.

[0067] For each inductor wiring 120, the current flows from the first pad 122 to the second pad 123. That is, the current flows in the same direction between the first end on one side and the second end on the other side of the extending direction of the inductor wiring 120. In this embodiment, as in the first embodiment described above, for the four inductor wirings 120, the current flows from the first end to the second end.

[0068] In the first layer L11, the wiring bodies 121 of the inductor wiring 120 as a whole extend in the long-side direction of the rectangular first layer L11 in a plan view. The wiring bodies 121 of the inductor wirings 120 are arranged in the short-side direction of the rectangular first layer L11.

[0069] The first wiring body 121A of the first inductor wiring 120A is arranged on one side in the short-side direction of the rectangular first layer L11 in a plan view. The first wiring body 121A is bent so as to protrude outward in the short-side direction of the rectangular first layer L11.

[0070] The first pad 122A is connected to the first end on one side in the extension direction of the first wiring body 121A. The first pad 122A has a quadrilateral shape when viewed from the top and bottom direction. On the other hand, the second pad 123 is connected to the second end on the other side in the extension direction of the first wiring body 121A. The second pad 123 has a rectangular shape that is long in the short side direction of the first layer L11 when viewed from the top and bottom direction.

[0071] The second wiring body 121B of the second inductor wiring 120B is arranged closer to the center side of the short-side direction of the rectangular first layer L11 than the first wiring body 121A of the first inductor wiring 120A in a plan view. The second wiring body 121B is curved so as to protrude toward the inside of the short-side direction of the rectangular first layer L11. The second wiring body 121B has a larger curvature radius than the first wiring body 121A. As a result, the length of the second wiring body 121B is smaller than the length of the first wiring body 121A.

[0072] The first pad 122B is connected to the first end on one side in the extending direction of the second wiring body 121B. The first pad 122B has a quadrilateral shape when viewed from the top and bottom direction. On the other hand, the second pad 123 is connected to the second end on the other side in the extending direction of the second wiring body 121B. That is, the second pad 123 is the second end of the first inductor wiring 120A and also the second end of the second inductor wiring 120B.

[0073] Two third inductor wirings 120C are arranged on the other side of the center of the rectangular first layer L11 in the short-side direction when viewed from above. The third wiring bodies 121C of the two third inductor wirings 120C are line-symmetrical with the first wiring body 121A and the second wiring body 121B with the center of the rectangular first layer L11 in the short-side direction as the axis of symmetry. That is, the third wiring body 121C on the center side of the rectangular first layer L11 in the short-side direction is bent so as to protrude toward the inner side of the rectangular first layer L11 in the short-side direction. On the other hand, the third wiring body 121C on the outer side of the rectangular first layer L11 in the short-side direction is bent so as to protrude toward the outer side of the rectangular first layer L11 in the short-side direction.

[0074] The first pad 122C is connected to the first end on one side in the extension direction of the third wiring body 121C. Each first pad 122C has a quadrilateral shape when viewed from the top and bottom. On the other hand, the second pad 123 is connected to the second end on the other side in the extension direction of the two third wiring bodies 121C. That is, the second pad 123 is the second end of the first inductor wiring 120A and also the second end of the two third inductor wirings 120C. In addition, the first pads 122 are separated from each other.

[0075] The number of turns of each inductor wiring 120 is less than 1.0 turn. In addition, the inductor wiring 120 is made of a conductive material. In this embodiment, the composition of the inductor wiring 120 is: the ratio of copper is 99 wt % or more, and the ratio of sulfur is 0.1 wt % or more and less than 1.0 wt %.

[0076] The dummy wiring 130 extends from the center of the extension direction of the second pad 123, that is, the center of the short side direction of the first layer L11, to the side surface of the first layer L11, and is exposed on the outer surface of the inductor component 110. The material of the dummy wiring 130 is the same as that of each inductor wiring 120. In addition, the dummy wiring 130 is integrated with the four inductor wirings 120.

[0077] In the first layer L11, the portion other than the inductor wiring 120 and the dummy wiring 130 is the first magnetic layer 141. The first magnetic layer 141 is composed of a mixture of resin and metal magnetic powder. That is, the first magnetic layer 141 is a magnetic body. Figure 4 In FIG. 1 , the first columnar wiring 151, the second columnar wiring 152, the third columnar wiring 153, and the fourth columnar wiring 154 described later are indicated by double-dashed lines. In addition, the dimension of the inductor wiring 120 in the stacking direction is the same as the dimension of the dummy wiring 130 in the stacking direction, and the dimension of the inductor wiring 120 in the stacking direction is the same as the dimension of the first layer L11 in the stacking direction.

[0078] In the first layer L11, the minimum distance between the first pads 122, i.e., the first pad-to-pad distance ID, is 40 times or more the average particle size of the metal magnetic powder constituting the first magnetic layer 141. The average particle size of the metal magnetic powder is measured using a SEM (Scanning Electron Microscope) image of a cross section through the magnetic layer 140 in the state of the inductor component 110. Specifically, in the SEM image at a magnification that can confirm 15 or more metal magnetic powders, the area of ​​each metal magnetic powder is measured, and the arithmetic average thereof is calculated based on the equivalent circle diameter calculated by {4 / π×(area)}^(1 / 2) as the average particle size of the metal magnetic powder. In addition, in the raw material stage, the average particle size of the metal magnetic powder is measured by a laser diffraction / scattering method in the raw material state of the metal magnetic powder. The particle size corresponding to 50% of the cumulative value in the particle size distribution obtained by the laser diffraction / scattering method is taken as the average particle size of the metal magnetic powder.

[0079] like Figure 3As shown, the second layer L12 having a rectangular shape in a plan view similar to the first layer L11 is stacked on the lower surface of the first layer L11. The second layer L12 is the second magnetic layer 142. Therefore, the second magnetic layer 142 is stacked on the lower surface of the inductor wiring 120. The second magnetic layer 142 is composed of a mixture of resin and metal powder similar to the first magnetic layer 141, and is therefore a magnetic body.

[0080] The third layer L13 having a rectangular shape in plan view similar to the first layer L11 is stacked on the upper surface of the first layer L11. The third layer L13 includes a first columnar wiring 151, a second columnar wiring 152, a third columnar wiring 153, two fourth columnar wirings 154, and a third magnetic layer 143.

[0081] The first columnar wiring 151 penetrates the third magnetic layer 143 in the stacking direction and is connected to the upper surface of the first pad 122A of the first inductor wiring 120A. The material of the first columnar wiring 151 is the same material as that of the first inductor wiring 120A. In addition, the first columnar wiring 151 is integrated with the first inductor wiring 120A. The first columnar wiring 151 is prism-shaped, and the axial direction of the prism is consistent with the stacking direction. The size of the first columnar wiring 151 in the stacking direction is the same as the size of the third layer L13 in the stacking direction. Therefore, the upper surface of the first columnar wiring 151 is exposed on the upper surface of the third layer L13. When viewed from above, the size of the rectangular first columnar wiring 151 is slightly smaller than the size of the rectangular first pad 122A. In the present embodiment, the first columnar wiring 151 is a first vertical wiring.

[0082] The third columnar wiring 153 penetrates the third magnetic layer 143 in the stacking direction and is connected to the upper surface of the first pad 122B of the second inductor wiring 120B. The material of the third columnar wiring 153 is the same material as that of the second inductor wiring 120B. In addition, the third columnar wiring 153 is integrated with the second inductor wiring 120B. The third columnar wiring 153 is prism-shaped, and the axial direction of the prism is consistent with the stacking direction. The dimension of the third columnar wiring 153 in the stacking direction is the same as the dimension of the third layer L13 in the stacking direction. Therefore, the upper surface of the third columnar wiring 153 is exposed on the upper surface of the third layer L13. When viewed from above, the size of the rectangular third columnar wiring 153 is slightly smaller than the size of the rectangular first pad 122B. In the present embodiment, the second columnar wiring 152 is the second vertical wiring.

[0083] The fourth columnar wiring 154 penetrates the third magnetic layer 143 in the stacking direction and is connected to the upper surface of the first pad 122C of the third inductor wiring 120C. The material of the fourth columnar wiring 154 is the same as that of the third inductor wiring 120C. In addition, the fourth columnar wiring 154 is integrated with the third inductor wiring 120C. The fourth columnar wiring 154 is prism-shaped, and the axial direction of the prism is consistent with the stacking direction. The size of the fourth columnar wiring 154 in the stacking direction is the same as the size of the third layer L13 in the stacking direction. Therefore, the upper surface of the fourth columnar wiring 154 is exposed on the upper surface of the third layer L13. When viewed from above, the size of the rectangular fourth columnar wiring 154 is slightly smaller than the size of the rectangular first pad 122C. In this embodiment, the fourth columnar wiring 154 is a fourth vertical wiring. In addition, one fourth columnar wiring 154 is arranged on each of the upper sides of the two first pads 122C.

[0084] The second columnar wiring 152 penetrates the third magnetic layer 143 in the stacking direction and is connected to the upper surface of the second pad 123. The material of the second columnar wiring 152 is the same material as that of the first inductor wiring 120A. In addition, the second columnar wiring is integrated with each inductor wiring 120. The second columnar wiring is prism-shaped, and the axial direction of the prism is consistent with the stacking direction. The size of the second columnar wiring 152 in the stacking direction is the same as the size of the third layer L13 in the stacking direction. Therefore, the upper surface of the second columnar wiring 152 is exposed on the upper surface of the third layer L13. When viewed from above, the size of the rectangular second columnar wiring 152 is slightly smaller than the size of the rectangular second pad 123. In the present embodiment, the second columnar wiring 152 is a second vertical wiring.

[0085] As described above, the second pad 123 is the second end of the first inductor wiring 120A, the second inductor wiring 120B, and the third inductor wiring 120C. Therefore, the second columnar wiring 152 is connected to the second pad 123, which is the second end of the four inductor wirings 120.

[0086] In the third layer L13, the portion other than the first columnar wiring 151, the second columnar wiring 152, the third columnar wiring 153, and the fourth columnar wiring 154 is the third magnetic layer 143. Therefore, the third magnetic layer 143 is stacked on the upper surface of the inductor wiring 120. The third magnetic layer 143 is composed of a mixture of resin and metal magnetic powder, similarly to the first magnetic layer 141 and the second magnetic layer 142, and is therefore a magnetic body.

[0087] In the inductor component 110, the magnetic layer 140 is composed of a first magnetic layer 141, a second magnetic layer 142, and a third magnetic layer 143. The first magnetic layer 141, the second magnetic layer 142, and the third magnetic layer 143 are connected to surround the inductor wiring 120. In this way, the magnetic layer 140 forms a closed magnetic path with respect to the inductor wiring 120. In addition, although the first magnetic layer 141, the second magnetic layer 142, and the third magnetic layer 143 are shown separately, they are integrated as the magnetic layer 140.

[0088] Next, the operation and effects of the second embodiment are described. In the second embodiment, in addition to the effects (1), (2), and (4) of the first embodiment, the following effects are achieved.

[0089] (5) According to the second embodiment, the length of the first wiring main body 121A of the first inductor wiring 120A is different from the length of the second wiring main body 121B of the second inductor wiring 120B. Therefore, for example, by providing a switch element on the upstream side of each of the four pillar-shaped wirings of the first pillar-shaped wiring 151, the third pillar-shaped wiring 153, and the fourth pillar-shaped wiring 154 of the inductor component 110, it is possible to select which inductor wiring 120 to flow current, thereby switching the obtained inductance.

[0090] (6) According to the second embodiment, the first pad-to-pad distance ID, which is the minimum distance between the first pads 122 of the inductor wiring 120, is 40 times or more the average particle size of the metal magnetic powder constituting the first magnetic layer 141. If the first pad-to-pad distance ID is too small, there is a concern that the first pads 122 may be short-circuited via the particles of the metal magnetic powder between the first pads 122. According to the second embodiment, the first pads 122 are sufficiently separated by the first pad-to-pad distance ID relative to the particle size of the metal magnetic powder. Therefore, it is easy to prevent the two first pads 122 from being short-circuited.

[0091] <Third embodiment>

[0092] A third embodiment of the inductor component will be described below. The third embodiment described below mainly differs from the inductor component 10 of the first embodiment in the shape and arrangement of the inductor wiring. In particular, the layer where the inductor wiring is arranged is different.

[0093] like Figure 5 As shown in FIG. 1 , the inductor component 210 as a whole has a structure in which seven thin plate-like layers are stacked in the thickness direction. In the following description, the stacking direction in which the seven layers are stacked is described as the up-down direction. Figure 6 The center is the direction perpendicular to the paper surface.

[0094] The first layer L21 is composed of a first inductor wiring 220A, a dummy wiring 230A, a first layer connection wiring 261, a first insulating portion 271, and a first magnetic layer 241. The first layer L21 is rectangular in a plan view. The first inductor wiring 220A is composed of a first wiring body 221A having a substantially constant line width, a first pad 222A connected to a first end of the first wiring body 221A, and a second pad 223A connected to a second end of the first wiring body 221A. In the present embodiment, the first pad 222A is a first end of the first inductor wiring 220A, and the second pad 223A is a second end of the first inductor wiring 220A.

[0095] In the first inductor wiring 220A, current flows between the first end portion on one side and the second end portion on the other side in the extending direction of the first inductor wiring 220A. In this embodiment, in the first inductor wiring 220A, current flows from the first pad 222A to the second pad 223A. That is, in the first inductor wiring 220A, current flows from the first end portion to the second end portion.

[0096] like Figure 6 As shown, in the first layer L21, the first wiring body 221A of the first inductor wiring 220A extends in a spiral shape centered near the center of the rectangle of the first layer L21 when viewed from above. Specifically, the first wiring body 221A of the first inductor wiring 220A is spirally wound clockwise from the first end on the radial outside toward the second end on the radial inside.

[0097] In the present embodiment, the first inductor wiring 220A is wound at an angle of 540 degrees. Therefore, the number of turns of the first inductor wiring 220A is 1.5 turns in the present embodiment. In addition, in the present embodiment, when the first layer L21 is viewed from above, in the long side direction of the rectangular first layer L21, the side where the first end of the first wiring body 221A is arranged is set as the first end side, and the side where the second end of the first wiring body 221A is arranged is set as the second end side.

[0098] The first inductor wiring 220A is made of a conductive material. In the present embodiment, the first inductor wiring 220A has a composition in which the ratio of copper is 99 wt % or more and the ratio of sulfur is 0.1 wt % or more and less than 1.0 wt %.

[0099] A first pad 222A is connected to a first end on one side in the extending direction of the first wiring body 221A. The first pad 222A is substantially quadrilateral in a plan view. The first pad 222A constitutes a first end of the first inductor wiring 220A. The first pad 222A is arranged near a corner of the first layer L21 which is rectangular in a plan view. The first pad 222A has a wider wiring width than the first wiring body 221A connected to the first pad 222A.

[0100] A second pad 223A is connected to the second end on the other side of the extension direction of the first wiring body 221A. The second pad 223A is circular in a plan view. The second pad 223A constitutes the second end of the first inductor wiring 220A. The second pad 223A has a wider wiring width than the first wiring body 221A connected to the second pad 223A.

[0101] A dummy wiring 230A is connected to the first pad 222A. The dummy wiring 230A extends from a portion of the first pad 222A on the side opposite to the first wiring body 221A to the side surface of the first layer L21 and is exposed on the outer surface of the inductor component 210. The material of the dummy wiring 230A is the same as that of the first inductor wiring 220A. In addition, the first inductor wiring 220A and the dummy wiring 230A are integrated.

[0102] In the first layer L21, in a plan view, a first layer connection wiring 261 is arranged near a corner on the side opposite to the first pad 222A in the short side direction of the rectangular first layer L21 and on the first end side in the long side direction. The first layer connection wiring 261 has the same shape as the first pad 222A and the dummy wiring 230A, and is line-symmetrical with the first pad 222A and the dummy wiring 230A with a straight line extending in the long side direction of the first layer L21 passing through the center of the short side direction of the first layer L21 as the axis of symmetry. The first layer connection wiring 261 is made of the same material as the first inductor wiring 220A.

[0103] In the first layer L21, the side surface of the first inductor wiring 220A, the side surface of the dummy wiring 230A, and the side surface of the first layer connection wiring 261 are covered by the first insulating portion 271. That is, the first inductor wiring 220A, the dummy wiring 230A, and the first layer connection wiring 261 are surrounded by the first insulating portion 271. The first insulating portion 271 is an insulating resin with insulating properties, and has higher insulation than the first inductor wiring 220A. In addition, the portion other than the first inductor wiring 220A, the first layer connection wiring 261, and the first insulating portion 271 is the first magnetic layer 241. Therefore, the first magnetic layer 241 is arranged at the central portion of the first layer L21, the two end portions in the short side direction of the first layer L21, and the first end side portion in the long side direction of the first layer L21.

[0104] The first magnetic layer 241 is composed of a mixture of resin and metal magnetic powder. Therefore, the first magnetic layer 241 is a magnetic body. Figure 6 In the figure, the first columnar wiring 257, the second columnar wiring 258, the first through hole 251, the second through hole 252, the third through hole 253, the fourth through hole 254, the fifth through hole 255, and the sixth through hole 256 described later are shown by double-dashed lines. In addition, the second inductor wiring 220B and the fifth layer connection wiring 262 described later are shown by dotted lines.

[0105] like Figure 5 As shown, a second layer L22 having a rectangular shape in plan view similar to the first layer L21 is stacked on the lower surface of the first layer L21. The second layer L22 is composed of a second insulating portion 272 and a second magnetic layer 242. Therefore, the second magnetic layer 242 is stacked on the lower surface of the first inductor wiring 220A.

[0106] The second insulating portion 272 covers the first inductor wiring 220A, the dummy wiring 230A, and the first layer connection wiring 261 from the bottom. That is, the second insulating portion 272 covers the entire lower surface of the conductive wiring portion of the first layer L21. The second insulating portion 272 is an insulating resin having the same insulating properties as the first insulating portion 271, and has higher insulating properties than the first inductor wiring 220A.

[0107] In the second layer L22, the portion other than the second insulating portion 272 is the second magnetic layer 242. Therefore, the second magnetic layer 242 is arranged at the center portion of the second layer L22, at both ends of the second layer L22 in the short side direction, and at the first end side portion of the second layer L22 in the long side direction. The second magnetic layer 242 is composed of a mixture of resin and metal magnetic powder like the above-mentioned first magnetic layer 241, and is therefore a magnetic body.

[0108] The third layer L23 is stacked on the lower surface of the second layer L22, which is rectangular in plan view like the first layer L21. The third layer L23 is the third magnetic layer 243. Therefore, the third magnetic layer 243 is stacked on the lower surface of the first inductor wiring 220A. The third magnetic layer 243 is composed of a mixture of resin and metal magnetic powder like the first magnetic layer 241, and is therefore a magnetic body.

[0109] The fourth layer L24 having a rectangular shape in a plan view similar to the first layer L21 is stacked on the upper surface of the first layer L21. The fourth layer L24 is composed of the third insulating portion 273, the first through hole 251, the second through hole 252, the third through hole 253, and the fourth magnetic layer 244. The first through hole 251, the second through hole 252, and the third through hole 253 penetrate the fourth magnetic layer 244 in the stacking direction.

[0110] The first through hole 251 is arranged on the upper side of the first pad 222A of the first layer L21 and is connected to the first pad 222A. The second through hole 252 is arranged on the upper side of the first layer connection wiring 261 of the first layer L21 and is connected to the first layer connection wiring 261. The third through hole 253 is arranged on the upper side of the second pad 223A of the first layer L21 and is connected to the second pad 223A. These first through holes 251, second through holes 252 and third through holes 253 are columnar, and the axial direction is consistent with the stacking direction. The dimensions of the first through hole 251, second through hole 252 and third through hole 253 in the stacking direction are the same as the dimensions of the fourth layer L24 in the stacking direction. Therefore, the first through hole 251, the second through hole 252 and the third through hole 253 penetrate the fourth layer L24 in the stacking direction.

[0111] The third insulating portion 273 covers the first inductor wiring 220A, the dummy wiring 230A, the first layer connection wiring 261, and the first insulating portion 271 from the upper side. That is, the third insulating portion 273 covers all of the upper surfaces of the wirings arranged on the first layer L21 except for the portions where the first through-holes 251, the second through-holes 252, and the third through-holes 253 are arranged. The third insulating portion 273 has a shape that covers a slightly wider range than the outer edges of the first inductor wiring 220A, the dummy wiring 230A, and the first layer connection wiring 261 when viewed from above. Therefore, the shape of the third insulating portion 273 is similar to that of the second insulating portion 272 except for the portions where the first through-holes 251, the second through-holes 252, and the third through-holes 253 are arranged. The third insulating portion 273 is made of insulating resin having the same insulating properties as the first insulating portion 271 , and has higher insulating properties than the first inductor wiring 220A.

[0112] In the fourth layer L24, the portion other than the first through hole 251, the second through hole 252, the third through hole 253, and the third insulating portion 273 is the fourth magnetic layer 244. Therefore, the fourth magnetic layer 244 is arranged at the central portion of the fourth layer L24, at both ends of the fourth layer L24 in the short side direction, and at the first end side portion of the fourth layer L24 in the long side direction. The fourth magnetic layer 244 is composed of a mixture of resin and metal magnetic powder like the above-mentioned first magnetic layer 241, and is therefore a magnetic body.

[0113] The fifth layer L25 having a rectangular shape in a plan view similar to the first layer L21 is stacked on the upper surface of the fourth layer L24. The fifth layer L25 is composed of the second inductor wiring 220B, the dummy wiring 230B, the fifth-layer connection wiring 262, the fourth insulating portion 274, and the fifth magnetic layer 245. The second inductor wiring 220B is composed of a second wiring body 221B having a substantially constant line width, a first pad 222B connected to the first end of the second wiring body 221B, and a second pad 223B connected to the second end of the second wiring body 221B. In the present embodiment, the first pad 222B is the first end of the second inductor wiring 220B, and the second pad 223B is the second end of the second inductor wiring 220B.

[0114] For the second inductor wiring 220B, the current flows between the first end on one side and the second end on the other side in the extending direction of the second inductor wiring 220B. In this embodiment, for the second inductor wiring 220B, the current flows from the first pad 222B to the second pad 223B. That is, for the second inductor wiring 220B, the current flows from the first end to the second end. Therefore, for both the first inductor wiring 220A and the second inductor wiring 220B, the current flows from the first end to the second end in the same direction between the first end and the second end.

[0115] In the fifth layer L25, the second wiring main body 221B of the second inductor wiring 220B extends in a spiral shape with the spiral center of the first inductor wiring 220A as the center when viewed from above. Specifically, the second wiring main body 221B of the second inductor wiring 220B spirally winds counterclockwise from the first end on the radial outside toward the second end on the radial inside. That is, the winding direction of the second inductor wiring 220B is opposite to the winding direction of the first inductor wiring 220A.

[0116] In the present embodiment, the second inductor wiring 220B is wound at an angle of 540 degrees. Therefore, the number of turns of the second inductor wiring 220B is 1.5 turns in the present embodiment.

[0117] The first pad 222B is connected to the first end on one side in the extension direction of the second wiring body 221B. The first pad 222B is substantially quadrilateral in a plan view. The first pad 222B constitutes the first end of the second inductor wiring 220B. The first pad 222B is arranged near the corner of the fifth layer L25 which is rectangular in a plan view. In particular, in this embodiment, the first pad 222B is located on the upper side of the first layer connection wiring 261 in the first layer L21, and is connected to the first layer connection wiring 261 via the second through hole 252. The first pad 222B has a wider wiring width than the second wiring body 221B connected to the first pad 222B.

[0118] The second pad 223B is connected to the second end on the other side in the extension direction of the second wiring body 221B. The second pad 223B is circular in shape when viewed from the top and bottom direction. The second pad 223B is located on the upper side of the second pad 223A in the first layer L21 and is connected to the second pad 223B via the third through hole 253. The second pad 223B has a wider wiring width than the second wiring body 221B connected to the second pad 223B. The second pad 223B constitutes the second end of the second inductor wiring 220B.

[0119] A dummy wiring 230B is connected to the first pad 222B. The dummy wiring 230B extends from a portion of the first pad 222B on the side opposite to the second wiring body 221B to the side surface of the fifth layer L25 and is exposed on the outer surface of the inductor component 210. The material of the dummy wiring 230B is the same as that of the second inductor wiring 220B. In addition, the second inductor wiring 220B is integrated with the dummy wiring 230B.

[0120] In the fifth layer L25, a fifth layer connection wiring 262 is arranged on the upper side of the first pad 222A of the first layer L21. The fifth layer connection wiring 262 has the same shape as the first pad 222B and the dummy wiring 230B, and is linearly symmetrical with the first pad 222B and the dummy wiring 230B, with a straight line extending in the long side direction of the fifth layer L25 passing through the center of the short side direction of the fifth layer L25 as the symmetry axis.

[0121] In the fifth layer L25, the side surface of the second inductor wiring 220B, the side surface of the dummy wiring 230B, and the side surface of the fifth layer connection wiring 262 are covered by the fourth insulating portion 274. That is, the second inductor wiring 220B, the dummy wiring 230B, and the fifth layer connection wiring 262 are surrounded by the fourth insulating portion 274. The fourth insulating portion 274 is an insulating resin with insulating properties, and has higher insulation than the second inductor wiring 220B. In addition, the portion other than the second inductor wiring 220B, the fifth layer connection wiring 262, and the fourth insulating portion 274 is the fifth magnetic layer 245. Therefore, the fifth magnetic layer 245 is arranged at the central portion of the fifth layer L25, the two end portions in the short side direction of the fifth layer L25, and the first end side portion in the long side direction of the fifth layer L25.

[0122] The fifth magnetic layer 245 is made of a mixture of resin and metal magnetic powder. Therefore, the fifth magnetic layer 245 is a magnetic body. In addition, the fourth insulating portion 274 is an insulating resin having the same insulating properties as the first insulating portion 271, and has higher insulating properties than the second inductor wiring 220B.

[0123] like Figure 5As shown, the sixth layer L26 having a rectangular shape in a plan view similar to the first layer L21 is stacked on the upper surface of the fifth layer L25. The sixth layer L26 is composed of the fifth insulating portion 275, the fourth through hole 254, the fifth through hole 255, the sixth through hole 256, and the sixth magnetic layer 246. The fourth through hole 254, the fifth through hole 255, and the sixth through hole 256 penetrate the sixth magnetic layer 246 in the stacking direction.

[0124] The fourth through hole 254 is arranged on the upper side of the first pad 222B of the fifth layer L25 and is connected to the first pad 222B. The fifth through hole 255 is arranged on the upper side of the fifth layer connection wiring 262 of the fifth layer L25 and is connected to the fifth layer connection wiring 262. The sixth through hole 256 is arranged on the upper side of the second pad 223B of the fifth layer L25 and is connected to the second pad 223B. These fourth through holes 254, fifth through holes 255 and sixth through holes 256 are columnar, and the axial direction is consistent with the stacking direction. The dimensions of the fourth through holes 254, fifth through holes 255 and sixth through holes 256 in the stacking direction are the same as the dimensions of the sixth layer L26 in the stacking direction. Therefore, the fourth through holes 254, fifth through holes 255 and sixth through holes 256 penetrate the sixth layer L26 in the stacking direction.

[0125] The fifth insulating portion 275 covers the second inductor wiring 220B, the dummy wiring 230B, the fifth layer connection wiring 262, and the fourth insulating portion 274 from the upper side. That is, the fifth insulating portion 275 covers all of the upper surfaces of the wirings arranged on the fifth layer L25 except for the portions where the fourth through hole 254, the fifth through hole 255, and the sixth through hole 256 are arranged. The fifth insulating portion 275 has a shape that covers a slightly wider range than the outer edges of the second inductor wiring 220B, the dummy wiring 230B, and the fifth layer connection wiring 262 when viewed from above. Therefore, the shape of the fifth insulating portion 275 is the same as that of the third insulating portion 273. The fifth insulating portion 275 is an insulating resin having the same insulating property as the first insulating portion 271, and has higher insulating properties than the first inductor wiring 220A.

[0126] In the inductor component 210, the first insulating portion 271, the second insulating portion 272, the third insulating portion 273, the fourth insulating portion 274, and the fifth insulating portion 275 are connected, and the insulating portion 270 is composed of these. The insulating portion 270 surrounds and covers most of the outer surface of the first inductor wiring 220A and the outer surface of the second inductor wiring 220B. In addition, the first insulating portion 271, the second insulating portion 272, the third insulating portion 273, the fourth insulating portion 274, and the fifth insulating portion 275 are shown separately in the figure, but they are integrated as the insulating portion 270. In addition, the material of the insulating portion 270 is a non-magnetic body that does not contain magnetic powder.

[0127] In the sixth layer L26, the portion other than the fourth through hole 254, the fifth through hole 255, the sixth through hole 256, and the fifth insulating portion 275 is the sixth magnetic layer 246. The sixth magnetic layer 246 is composed of a mixture of resin and metal magnetic powder, similarly to the first magnetic layer 241, and is therefore a magnetic body. Therefore, the sixth magnetic layer 246 is arranged at the center portion of the sixth layer L26, at both ends of the sixth layer L26 in the short side direction, and at the first end side portion of the sixth layer L26 in the long side direction.

[0128] The seventh layer L27 having a rectangular shape in a plan view similar to the first layer L21 is stacked on the upper surface of the sixth layer L26. The seventh layer L27 is composed of the first columnar wiring 257, the second columnar wiring 258, the third columnar wiring 259, and the seventh magnetic layer 247. The first columnar wiring 257, the second columnar wiring 258, and the third columnar wiring 259 penetrate the seventh magnetic layer 247 in the stacking direction.

[0129] The first columnar wiring 257 is arranged on the upper side of the fifth layer connection wiring 262 in the fifth layer L25, and is connected to the fifth layer connection wiring 262 via the fifth through hole 255. The third columnar wiring 259 is arranged on the upper side of the first pad 222B in the fifth layer L25, and is connected to the first pad 222B via the fourth through hole 254. The first columnar wiring 257 and the third columnar wiring 259 are prism-shaped, and the axial direction is consistent with the stacking direction. The dimensions of the first columnar wiring 257 and the third columnar wiring 259 in the stacking direction are the same as the dimensions of the seventh layer L27 in the stacking direction. Therefore, the first columnar wiring 257 and the third columnar wiring 259 penetrate the seventh layer L27 in the stacking direction.

[0130] The first columnar wiring 257 is connected to the first pad 222A of the first inductor wiring 220A via the fifth via 255, the fifth layer connection wiring 262, and the first via 251. In the present embodiment, the first vertical wiring is composed of the first via 251, the fifth layer connection wiring 262, the fifth via 255, and the first columnar wiring 257.

[0131] Here, the third columnar wiring 259 is connected to the first pad 222B of the second inductor wiring 220B via the fourth through hole 254. In addition, the first layer connection wiring 261 is connected to the first pad 222B of the second inductor wiring 220B via the second through hole 252. In this embodiment, the third vertical wiring is composed of the first layer connection wiring 261, the second through hole 252, the fourth through hole 254, and the third columnar wiring 259.

[0132] The second columnar wiring 258 is arranged on the upper side of the second pad 223B of the second inductor wiring 220B, and is connected to the second pad 223B via the sixth through hole 256. The second columnar wiring 258 is cylindrical, and the axial direction of the cylinder is consistent with the stacking direction. The dimension of the second columnar wiring 258 in the stacking direction is the same as the dimension of the seventh layer L27 in the stacking direction. Therefore, the second columnar wiring 258 passes through the seventh layer L27 in the stacking direction.

[0133] Here, the second columnar wiring 258 is connected to the second pad 223B, which is the second end of the second inductor wiring 220B, via the sixth through hole 256. In addition, the second pad 223B is connected to the second pad 223A, which is the second end of the first inductor wiring 220A, via the third through hole 253. In this embodiment, the second vertical wiring is composed of the third through hole 253, the sixth through hole 256, and the second columnar wiring 258. Therefore, the third through hole 253 in the second vertical wiring is connected to the second pad 223A of the first inductor wiring 220A and the second pad 223B of the second inductor wiring 220B, and the second columnar wiring 258 in the second vertical wiring is connected to the second pad 223A of the first inductor wiring 220A.

[0134] In the seventh layer L27, the portion other than the first columnar wiring 257 and the second columnar wiring 258 is the seventh magnetic layer 247. Therefore, the seventh magnetic layer 247 is stacked on the upper surface of the second inductor wiring 220B. The seventh magnetic layer 247 is composed of a mixture of resin and metal magnetic powder, similar to the first magnetic layer 241 described above, and is therefore a magnetic body.

[0135] In the inductor component 210, the first magnetic layer 241, the second magnetic layer 242, the third magnetic layer 243, the fourth magnetic layer 244, the fifth magnetic layer 245, the sixth magnetic layer 246, and the seventh magnetic layer 247 are connected, and the magnetic layer 240 is composed of them. The magnetic layer 240 surrounds the first inductor wiring 220A and the second inductor wiring 220B. In this way, the magnetic layer 240 forms a closed magnetic circuit with respect to the first inductor wiring 220A and the second inductor wiring 220B. In addition, the first magnetic layer 241, the second magnetic layer 242, the third magnetic layer 243, the fourth magnetic layer 244, the fifth magnetic layer 245, the sixth magnetic layer 246, and the seventh magnetic layer 247 are shown separately, but they are integrated as the magnetic layer 240.

[0136] The dimensions of the first pillar wiring 257 and the second pillar wiring 258 in the stacking direction are the same as the dimensions of the seventh magnetic layer 247 . Therefore, the upper surfaces of the first pillar wiring 257 and the second pillar wiring 258 are exposed from the seventh magnetic layer 247 .

[0137] Next, the operation and effects of the third embodiment described above will be described. In addition to the effects (1) and (3) of the first embodiment described above, the following effects are also achieved.

[0138] (7) According to the third embodiment, the first inductor wiring 220A and the second inductor wiring 220B are arranged side by side in the stacking direction. Furthermore, the second pad 223A, which is the second end of the first inductor wiring 220A, and the second pad 223B, which is the second end of the second inductor wiring 220B, are connected via the third through hole 253 in the second vertical wiring. Therefore, as the inductor component 210 as a whole, it is possible to suppress the increase in the size in the planar direction while accommodating the two inductor wirings 220.

[0139] (8) According to the third embodiment, the first inductor wiring 220A and the second inductor wiring 220B are covered with the insulating portion 270 which is an insulating resin. Therefore, the first inductor wiring 220A and the second inductor wiring 220B are less likely to be affected by static electricity from outside the inductor component 210. In addition, leakage and short circuit between the inductor wirings 220 are suppressed.

[0140] <Fourth embodiment>

[0141] Hereinafter, a fourth embodiment of the inductor component will be described. The fourth embodiment described below is different from the inductor component 10 of the first embodiment mainly in connection locations of a plurality of inductor wirings.

[0142] like Figure 7 As shown in FIG. 1 , the inductor component 310 as a whole has a structure in which seven thin plate-like layers are stacked in the thickness direction. In the following description, the stacking direction in which the seven layers are stacked is described as the up-down direction. Figure 8 The center is the direction perpendicular to the paper surface.

[0143] like Figure 8 As shown, the first layer L31 is composed of two inductor wirings 320, two dummy wirings 330, a first magnetic layer 341, and a first insulating portion 371. The first layer L31 is square in a plan view. The two inductor wirings 320 are composed of a first inductor wiring 320A and a second inductor wiring 320B. The inductor wiring 320 is composed of a wiring body 321 with a substantially constant line width, a first pad 322 connected to the first end of the wiring body 321, and a second pad 323 connected to the second end of the wiring body 321. In the present embodiment, the first pad 322 is the first end of the inductor wiring 320, and the second pad 323 is the second end of the inductor wiring 320.

[0144] For each inductor wiring 320, the current flows from the first pad 322 to the second pad 323. That is, the current flows in the same direction between the first end on one side and the second end on the other side of the extending direction of the inductor wiring 320. In this embodiment, for the two inductor wirings 320, the current flows from the first end to the second end.

[0145] like Figure 8 As shown in FIG. 1 , the first inductor wiring 320A and the second inductor wiring 320B are arranged in the first side direction, which is one of the sides of the first layer L31 that is square in a plan view. The first wiring main body 321A of the first inductor wiring 320A extends spirally around a point located between the first end in the first side direction and the center in the first side direction of the first layer L31 and located in the center of the second side direction orthogonal to the first side direction when viewed from above. Specifically, the first wiring main body 321A of the first inductor wiring 320A spirally winds counterclockwise from the first end in the radial direction toward the second end in the radial direction.

[0146] In the present embodiment, the first inductor wiring 320A is wound at an angle of 900 degrees. Therefore, the number of turns of the first inductor wiring 320A is 2.5 turns in the present embodiment.

[0147] The first inductor wiring 320A is made of a conductive material. In the present embodiment, the first inductor wiring 320A has a composition in which the ratio of copper is 99 wt % or more and the ratio of sulfur is 0.1 wt % or more and less than 1.0 wt %.

[0148] A first pad 322A is connected to a first end on one side in the extending direction of the first wiring body 321A. The first pad 322A is substantially elliptical in a plan view. The first pad 322A constitutes a first end of the first inductor wiring 320A. The first pad 322A is arranged on one side in the direction of the second side of the square in a plan view.

[0149] A second pad 323A is connected to the second end on the other side in the extending direction of the first wiring main body 321A. The second pad 323A has a circular shape in a plan view. The second pad 323A constitutes a second end portion of the first inductor wiring 320A.

[0150] The first dummy wiring 330A extends from the first pad 322A to the side surface of the first layer L31, and is exposed on the outer surface of the inductor component 310. The material of the first dummy wiring 330A is the same as that of the first inductor wiring 320A.

[0151] The second inductor wiring 320B is arranged on the side opposite to the first inductor wiring 320A with respect to the center of the first side direction of the first layer L31 which is square in plan view. The second wiring main body 321B of the second inductor wiring 320B extends spirally around a point located between the second end in the first side direction of the first layer L31 and the center in the first side direction and located in the center of the second side direction orthogonal to the first side direction when viewed from above. Specifically, the second wiring main body 321B of the second inductor wiring 320B spirally winds counterclockwise from the first end in the radial direction outer side toward the second end side in the radial direction inner side.

[0152] The shape, size and material of the second wiring main body 321B are the same as those of the first wiring main body 321A. Therefore, the winding angle of the second inductor wiring 320B is 900 degrees, and the number of turns of the second inductor wiring 320B is 2.5 turns. In addition, the second inductor wiring 320B is made of a conductive material, and the composition of the second inductor wiring 320B is: the ratio of copper is 99wt% or more, and the ratio of sulfur is 0.1wt% or more and less than 1.0wt%.

[0153] A first pad 322B is connected to the first end on one side in the extending direction of the second wiring body 321B. The first pad 322B is substantially elliptical in a plan view. The first pad 322B constitutes the first end of the second inductor wiring 320B. The first pad 322B is arranged on one side in the direction of the second side of the square in a plan view.

[0154] A second pad 323B is connected to the second end on the other side in the extending direction of the second wiring main body 321B. The second pad 323B has a circular shape in a plan view. The second pad 323B constitutes a second end portion of the second inductor wiring 320B.

[0155] The second dummy wiring 330B extends from the first pad 322B to the side surface of the first layer L31 and is exposed on the outer surface of the inductor component 310. The material of the second dummy wiring 330B is the same as that of the second inductor wiring 320B.

[0156] In the first layer L31, the side surfaces of the inductor wiring 320 and the side surfaces of the dummy wiring 330 are covered by the first insulating portion 371. That is, the inductor wiring 320 and the dummy wiring 330 are surrounded by the first insulating portion 371. The first insulating portion 371 is an insulating resin having higher insulation than the inductor wiring 320. In addition, the portion other than the inductor wiring 320, the dummy wiring 330, and the first insulating portion 371 is the first magnetic layer 341. Therefore, the first magnetic layer 341 is arranged near the rotation center of the wiring body 321 of each inductor wiring 320, at the center and at both ends in the second direction of the first layer L31 which is square in plan view.

[0157] The first magnetic layer 341 is composed of a mixture of resin and metal magnetic powder. Therefore, the first magnetic layer 341 is a magnetic body. Figure 8 In FIG. 1 , a first columnar wiring 351 , a second columnar wiring 352 , a third columnar wiring 353 , a fourth columnar wiring 354 , a first external terminal 391 , a second external terminal 392 , and a third external terminal 393 described later are indicated by double-dashed lines.

[0158] like Figure 7 As shown, the second layer L32 having a rectangular shape in a plan view similar to the first layer L31 is stacked on the lower surface of the first layer L31. The second layer L32 includes the first through hole 381, the second through hole 382, ​​the second insulating portion 372, and the second magnetic layer 342.

[0159] The first through hole 381 is arranged at the lower side of the first pad 322A of the first inductor wiring 320A and connected to the first pad 322A. The second through hole 382 is arranged at the lower side of the first pad 322B of the second inductor wiring 320B and connected to the first pad 322B. These first through holes 381 and second through holes 382 are cylindrical, and the axial direction is consistent with the stacking direction. The dimensions of the first through holes 381 and the second through holes 382 in the stacking direction are the same as the dimensions of the second layer L32 in the stacking direction. Therefore, the first through holes 381 and the second through holes 382 penetrate the second layer L32 in the stacking direction.

[0160] The second insulating portion 372 covers the inductor wiring 320, the dummy wiring 330, and the first insulating portion 371 from the bottom. That is, the second insulating portion 372 covers all the lower surfaces of the above-mentioned wirings except for the portions where the first through-holes 381 and the second through-holes 382 are arranged. The second insulating portion 372 has a shape that covers a slightly wider range than the outer edge of the first insulating portion 371 when viewed from above. The second insulating portion 372 is an insulating resin with the same insulating properties as the first insulating portion 371, and has higher insulating properties than the inductor wiring 320.

[0161] In the second layer L32, the portion other than the first through hole 381, the second through hole 382, ​​and the second insulating portion 372 is the second magnetic layer 342. Therefore, the second magnetic layer 342 is arranged near the rotation center of the wiring body 321 of each inductor wiring 320 when the second layer L32 is viewed from above, and at the center and both ends in the second direction of the second layer L32 which is a square when viewed from above. The second magnetic layer 342 is composed of a mixture of resin and metal magnetic powder, similarly to the above-mentioned first magnetic layer 341, and is therefore a magnetic body.

[0162] The third layer L33 having a rectangular shape in a plan view similar to the first layer L31 is stacked on the lower surface of the second layer L32 . The third layer L33 is composed of the first columnar wiring 351 , the second columnar wiring 352 , and the third magnetic layer 343 .

[0163] The first columnar wiring 351 is arranged at the lower side of the first through hole 381 and connected to the first through hole 381. The second columnar wiring 352 is arranged at the lower side of the second through hole 382 and connected to the second through hole 382. The first columnar wiring 351 and the second columnar wiring 352 are columnar, and the axial direction is consistent with the stacking direction. The dimensions of the first columnar wiring 351 and the second columnar wiring 352 in the stacking direction are the same as the dimensions of the third layer L33 in the stacking direction. Therefore, the first columnar wiring 351 and the second columnar wiring 352 penetrate the third layer L33 in the stacking direction.

[0164] In the third layer L33, the portion other than the first columnar wiring 351 and the second columnar wiring 352 is the third magnetic layer 343. Therefore, the third magnetic layer 343 is stacked on the lower surface of the inductor wiring 320. The third magnetic layer 343 is composed of a mixture of resin and metal magnetic powder like the first magnetic layer 341 described above, and is therefore a magnetic body.

[0165] In the third layer L33 , the dimensions of the third magnetic layer 343 in the stacking direction are the same as the dimensions of the first columnar wiring 351 and the second columnar wiring 352 . Therefore, the lower surfaces of the first columnar wiring 351 and the second columnar wiring 352 are exposed from the third magnetic layer 343 .

[0166] The fourth layer L34 having a rectangular shape in a plan view similar to the first layer L31 is stacked on the lower surface of the third layer L33 . The fourth layer L34 includes the first external terminal 391 , the third external terminal 393 , and the cladding layer 396 .

[0167] The first external terminal 391 is arranged at the lower side of the first columnar wiring 351, and is connected to the first pad 322A of the first inductor wiring 320A via the first columnar wiring 351 and the first through hole 381. The third external terminal 393 is arranged at the lower side of the second columnar wiring 352, and is connected to the first pad 322B of the second inductor wiring 320B via the second columnar wiring 352 and the second through hole 382. The first external terminal 391 and the third external terminal 393 are made of conductive materials, and in this embodiment, have a three-layer structure of copper, nickel, and gold. The first external terminal 391 and the third external terminal 393 are rectangular in a plan view, and cover a wider range than the first columnar wiring 351.

[0168] The portion of the fourth layer L34 other than the first external terminal 391 and the third external terminal 393 is a coating layer 396. The coating layer 396 has higher insulation than the third magnetic layer 343, and in this embodiment, the coating layer 396 is a solder resist layer. The dimensions of the first external terminal 391 and the third external terminal 393 in the fourth layer L34 in the stacking direction are larger than the dimensions of the coating layer 396 in the stacking direction.

[0169] The fifth layer L35 having a rectangular shape in plan view similar to the first layer L31 is stacked on the upper surface of the first layer L31 . The fifth layer L35 includes the third through hole 383 , the fourth through hole 384 , the fifth through hole 385 , the sixth through hole 386 , the third insulating portion 373 , and the fourth magnetic layer 344 .

[0170] The third through hole 383 is arranged on the upper side of the first pad 322A of the first inductor wiring 320A and connected to the first pad 322A. The fourth through hole 384 is arranged on the upper side of the second pad 323A of the first inductor wiring 320A and connected to the second pad 323A. The fifth through hole 385 is arranged on the upper side of the first pad 322B of the second inductor wiring 320B and connected to the first pad 322B. The sixth through hole 386 is arranged on the upper side of the second pad 323B of the second inductor wiring 320B and connected to the second pad 323B. The third through hole 383, the fourth through hole 384, the fifth through hole 385, and the sixth through hole 386 are cylindrical, and the axial direction is consistent with the stacking direction. The dimensions of the third through hole 383, the fourth through hole 384, the fifth through hole 385, and the sixth through hole 386 in the stacking direction are the same as the dimensions of the fifth layer L35 in the stacking direction. Therefore, the third through hole 383, the fourth through hole 384, the fifth through hole 385, and the sixth through hole 386 penetrate the fifth layer L35 in the stacking direction.

[0171] The third insulating portion 373 covers the inductor wiring 320, the dummy wiring 330, and the first insulating portion 371 from the upper side. That is, the third insulating portion 373 covers all the upper surfaces of the wirings arranged in the first layer L31 except for the portions where the third through hole 383, the fourth through hole 384, the fifth through hole 385, and the sixth through hole 386 are arranged. The third insulating portion 373 has a shape that covers a slightly wider range than the outer edge of the first insulating portion 371 when viewed from above. Therefore, the shape of the third insulating portion 373 is similar to that of the second insulating portion 372 except for the portions where the third through hole 383, the fourth through hole 384, the fifth through hole 385, and the sixth through hole 386 are arranged. The third insulating portion 373 is an insulating resin having the same insulating property as the first insulating portion 371, and has higher insulating property than the inductor wiring 320.

[0172] In the inductor component 310, the first insulating portion 371, the second insulating portion 372, and the third insulating portion 373 are connected, and the insulating portion 370 is composed of them. The insulating portion 370 surrounds and covers most of the outer surface of the inductor wiring 320. In addition, the first insulating portion 371, the second insulating portion 372, and the third insulating portion 373 are shown separately, but they are integrated as the insulating portion 370. In addition, the material of the insulating portion 370 is a non-magnetic body that does not contain magnetic powder.

[0173] In the fifth layer L35, the portion other than the third through hole 383, the fourth through hole 384, the fifth through hole 385, the sixth through hole 386 and the third insulating portion 373 is the fourth magnetic layer 344. The shape of the fourth magnetic layer 344 is the same as that of the second magnetic layer 342. The fourth magnetic layer 344 is made of a mixture of resin and metal magnetic powder, similarly to the first magnetic layer 341 described above, and is therefore an insulating resin.

[0174] The sixth layer L36 having a rectangular shape in plan view similar to the first layer L31 is stacked on the upper surface of the fifth layer L35 . The sixth layer L36 includes the third columnar wiring 353 , the fourth columnar wiring 354 , the fifth columnar wiring 355 , the sixth columnar wiring 356 , and the fifth magnetic layer 345 .

[0175] The third columnar wiring 353 is arranged on the upper side of the first pad 322A of the first inductor wiring 320A, and is connected to the first pad 322A via the third through hole 383. The fourth columnar wiring 354 is arranged on the upper side of the second pad 323A of the first inductor wiring 320A, and is connected to the second pad 323A via the fourth through hole 384. The fifth columnar wiring 355 is arranged on the upper side of the first pad 322B of the second inductor wiring 320B, and is connected to the first pad 322B via the fourth through hole 384. The sixth columnar wiring 356 is arranged on the upper side of the second pad 323B of the second inductor wiring 320B, and is connected to the second pad 323B via the sixth through hole 386. The third columnar wiring 353, the fourth columnar wiring 354, the fifth columnar wiring 355, and the sixth columnar wiring 356 are cylindrical, and the axis direction of the cylinder is consistent with the stacking direction. Therefore, the third columnar wiring 353, the fourth columnar wiring 354, the fifth columnar wiring 355, and the sixth columnar wiring 356 penetrate the sixth layer L36 in the stacking direction.

[0176] In the sixth layer L36, the portion other than the third columnar wiring 353, the fourth columnar wiring 354, the fifth columnar wiring 355, and the sixth columnar wiring 356 is the fifth magnetic layer 345. Therefore, the fifth magnetic layer 345 is stacked on the upper surface of the inductor wiring 320. The fifth magnetic layer 345 is composed of a mixture of resin and metal magnetic powder, similarly to the first magnetic layer 341 described above, and is therefore a magnetic body.

[0177] In the inductor component 310, the first magnetic layer 341, the second magnetic layer 342, the third magnetic layer 343, the fourth magnetic layer 344, and the fifth magnetic layer 345 are connected, and the magnetic layer 340 is composed of them. The magnetic layer 340 surrounds the inductor wiring 320. In this way, the magnetic layer 340 forms a closed magnetic path with respect to the inductor wiring 320. In addition, the first magnetic layer 341, the second magnetic layer 342, the third magnetic layer 343, the fourth magnetic layer 344, and the fifth magnetic layer 345 are shown separately, but they are integrated as the magnetic layer 340.

[0178] The dimension of the fifth magnetic layer 345 in the stacking direction is the same as the dimension of the sixth layer L36 in the stacking direction. Therefore, the upper surfaces of the third columnar wiring 353 , the fourth columnar wiring 354 , the fifth columnar wiring 355 , and the sixth columnar wiring 356 are exposed from the fifth magnetic layer 345 .

[0179] The seventh layer L37 having a rectangular shape in a plan view similar to the first layer L31 is stacked on the upper surface of the sixth layer L36 . The seventh layer L37 includes a second external terminal 392 , a fourth external terminal 394 , a fifth external terminal 395 , and a cladding layer 397 .

[0180] The fourth external terminal 394 is arranged on the upper side of the first columnar wiring 351, and is connected to the first pad 322A of the first inductor wiring 320A via the first columnar wiring 351 and the third through hole 383. The fifth external terminal 395 is arranged on the upper side of the second columnar wiring 352, and is connected to the first pad 322B of the second inductor wiring 320B via the second columnar wiring 352 and the fifth through hole 385. The fourth external terminal 394 and the fifth external terminal 395 are made of conductive materials, and in this embodiment, have a three-layer structure of copper, nickel, and gold. The fourth external terminal 394 is rectangular in a plan view, and covers a wider range than the third columnar wiring 353. The fifth external terminal 395 is rectangular in a plan view, and covers a wider range than the fifth columnar wiring 355. In the present embodiment, the fourth external terminal 394 functions as a second first external terminal, and the fifth external terminal 395 functions as a second third external terminal.

[0181] The second external terminal 392 is arranged on the upper side of the fourth columnar wiring 354 and the sixth columnar wiring 356 so as to cross the fourth columnar wiring 354 and the sixth columnar wiring 356, and is connected to any one of the fourth columnar wiring 354 and the sixth columnar wiring 356. In addition, the second external terminal 392 is connected to the second pad 323A of the first inductor wiring 320A and the second pad 323B of the second inductor wiring 320B via the fourth columnar wiring 354 and the sixth columnar wiring 356. The second external terminal 392 is a conductive material, and in this embodiment, it has a three-layer structure of copper, nickel, and gold. The second external terminal 392 has a rectangular shape that is long in the arrangement direction of the two inductor wirings 320 when viewed from above. The second external terminal 392 has a size that covers the fourth columnar wiring 354 and the sixth columnar wiring 356 when viewed from above.

[0182] The portion of the seventh layer L37 other than the second external terminal 392, the fourth external terminal 394, and the fifth external terminal 395 is a coating layer 397. The coating layer 397 has higher insulation than the fifth magnetic layer 345, and in this embodiment, the coating layer 397 is a solder resist layer. The dimensions of the second external terminal 392, the fourth external terminal 394, and the fifth external terminal 395 in the stacking direction are larger than the dimensions of the coating layer 397 in the stacking direction.

[0183] like Fig. 9 As shown, the thickness of the first layer L31, the thickness of the third layer L33, and the thickness of the sixth layer L36 are substantially the same. In addition, the thickness of the second layer L32 is substantially the same as the thickness of the fifth layer L35, and their thicknesses are smaller than the thickness of the first layer L31. Furthermore, the thickness of the fourth layer L34 is substantially the same as the thickness of the coating layer 397 of the seventh layer L37, and substantially the same as the thickness of the second layer L32.

[0184] Next, the operation and effects of the fourth embodiment will be described. In addition to the effects (2) and (3) of the first embodiment, the following effects are achieved.

[0185] (9) According to the fourth embodiment, one second external terminal 392 is connected to the fourth columnar wiring 354 connected to the second pad 323A of the first inductor wiring 320A and the sixth columnar wiring 356 connected to the second pad 323B of the second inductor wiring 320B. Therefore, the number of second external terminals 392 is smaller than that in the case where separate second external terminals 392 are connected to the fourth columnar wiring 354 and the sixth columnar wiring 356. Therefore, in designing the inductor component 310, the number of second external terminals 392 can be set to be smaller, so that the degree of design freedom is improved, and the size increase of the inductor component 10 as a whole can be suppressed.

[0186] <Embodiment of Inductor Component Mounting Substrate>

[0187] Hereinafter, an embodiment of an inductor component mounting substrate will be described. Hereinafter, an inductor component mounting substrate on which the inductor component 10 described in the first embodiment is mounted will be described. In addition, in this embodiment, the same reference numerals as those in the first embodiment are the same structures as those in the first embodiment, and therefore their descriptions are omitted.

[0188] like Fig.10 As shown, the inductor component mounting substrate 400 is composed of the inductor component 10 and a substrate 410 mounted on the inductor component 10. The substrate 410 is plate-shaped and is larger than the inductor component 10 in the planar direction.

[0189] The inductor component 10 is mounted on the first surface on one side in the thickness direction of the substrate 410. Four input wirings 420 are arranged in the substrate 410. Although not shown in the figure, the first end of the input wiring 420 in the extending direction is connected to the high potential side terminal of the DC power supply. Therefore, the first columnar wiring 51 functioning as the first vertical wiring, the third columnar wiring 53 functioning as the third vertical wiring, and the fourth columnar wiring 54 functioning as the fourth vertical wiring of the inductor component 10 function as the input side to which the input voltage is applied.

[0190] The second end of the input wiring 420 in the extending direction is exposed on the first surface of the substrate 410. The exposed portion of the second end of the input wiring 420 is configured to be connected to the first columnar wiring 51, the third columnar wiring, and the fourth columnar wiring 54 when the inductor component 10 is mounted on the substrate 410. Specifically, the first input wiring 420A of the four input wirings 420 is connected to the first columnar wiring 51, and the second input wiring 420B is connected to the third columnar wiring 53. In addition, although not shown in the figure, the two third input wirings are connected to the fourth columnar wiring 54. Therefore, the number of the input wirings 420 is equal to the number of the first vertical wirings of the inductor wiring 20.

[0191] In addition, an output wiring 430 is arranged in the substrate 410. The first end of the output wiring 430 in the extension direction is exposed on the first surface of the substrate 410. The exposed portion of the first end of the output wiring 430 is arranged to be connected to the second columnar wiring 52 of the inductor component 10 when mounted on the substrate 410 of the inductor component 10. Therefore, the second columnar wiring 52 of the inductor component 10 is applied with an output voltage lower than the input voltage, and functions as an output side.

[0192] Next, the functions and effects of the embodiment of the inductor component mounting substrate described above will be described. In addition to the effects (1) to (4) of the first embodiment described above, the following effects are also achieved.

[0193] (10) According to the above-mentioned embodiment of the inductor component mounting substrate, after the inductor component 10 having a plurality of inductor wirings 20 is mounted, the first end of the inductor wiring 20 can be used as the input side and the second end of the inductor wiring 20 can be used as the output side.

[0194] The above-mentioned embodiments can be modified and implemented as follows. The embodiments and the following modified examples can be combined and implemented within the scope of no technical contradiction.

[0195] In each of the above-mentioned embodiments, the inductance wiring may be any wiring that can provide inductance to a component by causing magnetic flux to generate inductance in a magnetic layer when current flows.

[0196] In the above-mentioned embodiments, the shape of the inductor wiring is not limited to the examples in the embodiments. Therefore, in the first and second embodiments, the inductor wiring may be in a curved shape with more than 1.0 turns or a straight line with 0 turns. In the third and fourth embodiments, the inductor wiring may be in a curved shape with less than 1.0 turns or a straight line with 0 turns. More specifically, Fig.11 As shown in FIG. 1 , the inductor component 510 may also include a linear inductor wiring 520. In this case, in the first layer L51, the wiring body 521 of the inductor wiring 520 is linear, the first end of the wiring body 521 in the extension direction is connected to the first pad 522, and the second end of the wiring body 521 in the extension direction is connected to the second pad 523. In addition, in the first layer L51, the portion other than the inductor wiring 520 and the dummy wiring 530 is a magnetic layer 541. In addition, as Fig.11 As shown, the four inductor wirings 520 may extend radially with the second pad 23 as the center. In the first embodiment, the wiring bodies 21 of the inductor wirings 20 may all be curved. In addition, a part of the plurality of inductor wirings may have a shape different from that of other inductor wirings. In addition, in each embodiment, the inductor wirings may have a meandering shape.

[0197] In the above-mentioned embodiments, the structure of the inductor wiring is not limited to the examples in the above-mentioned embodiments. For example, in the inductor wiring, the first pad and the second pad may be omitted, and the shapes of the first pad and the second pad are not limited to the examples in the above-mentioned embodiments. At least the first end of the inductor wiring is connected to the first vertical wiring and the second end of the inductor wiring is connected to the second vertical wiring.

[0198] In the first embodiment, the second end of the third inductor wiring 20C does not necessarily need to be the second pad 23 , and the second end of some of the third inductor wirings 20C may be the second pad 23 .

[0199] In the first embodiment and the second embodiment, the second ends of not all of the third inductor wirings may be connected to the second vertical wiring. For example, one of the two third inductor wirings may be connected to the second columnar wiring, and the other third inductor wiring may be connected to the fifth vertical wiring that is different from the second vertical wiring. In this case, the fifth vertical wiring may penetrate the magnetic layer and be exposed on the outer surface of the magnetic layer. In addition, the second ends of two of the four inductor wirings may be one second pad, and the second ends of the other two inductor wirings may be another second pad. In the case of three or more inductor wirings, the second ends of at least two of the inductor wirings may be connected to the common second vertical wiring. For example, in the case of four inductor wirings, the second ends of three of the inductor wirings may be connected to the common second vertical wiring.

[0200] In the above-mentioned embodiments, the shapes of the first pad and the second pad are not limited to the examples in the above-mentioned embodiments. For example, the shapes of the first pad and the second pad may be elliptical or polygonal in plan view.

[0201] In the above-mentioned embodiments, the composition of the inductor wiring is not limited to the examples in the above-mentioned embodiments.

[0202] In the above-mentioned embodiments, the composition of the magnetic layer is not limited to the examples in the above-mentioned embodiments. For example, the material of the magnetic layer may be ferrite powder or a mixture of ferrite powder and metal magnetic powder.

[0203] In each of the above-mentioned embodiments, the magnetic layers may not be integrated. For example, in the first embodiment, the first magnetic layer 41 , the second magnetic layer 42 , and the third magnetic layer 43 may be configured as separate bodies.

[0204] In the above-mentioned embodiments, the number of inductor wirings is not limited to the examples in the above-mentioned embodiments. The number of inductor wirings may be at least two or more.

[0205] In the above-mentioned embodiments, the relationship between the lengths of the inductor wirings is not limited to the examples in the above-mentioned embodiments. For example, in the first embodiment, the length of the wiring body 21 may be different for each inductor wiring 20 .

[0206] In the above-mentioned embodiments, the configuration of the dummy wiring is not limited to the examples in the above-mentioned embodiments. Fig.11 As shown in FIG. 5 , the dummy wiring 530 may extend toward the corner of the first layer L51. In addition, in each of the above-mentioned embodiments, the dummy wiring may be omitted.

[0207] In the above-mentioned embodiments, the shape of each layer is not limited to the examples in the above-mentioned embodiments, and may be, for example, a polygonal shape in plan view, a circular shape in plan view, an elliptical shape in plan view, or a combination of these shapes.

[0208] In the first embodiment, the angular pitch θ is not limited to the example in the first embodiment. When there are four inductor wirings 20, if the angular pitch θ is larger than 45 degrees and smaller than 180 degrees, it is easy to design the inductor wirings 20 to have the same length.

[0209] In the second embodiment, the first pad distance ID is not limited to the example of the second embodiment. Specifically, when the first pad distance ID is 20 times or more, it can be said that the first pad distance ID between the first pads 122 is sufficiently separated relative to the size of the particle size of the metal magnetic powder. Therefore, it is easy to prevent the two first pads 122 from short-circuiting each other. In addition, it can be appropriately adjusted according to the difference in the size of the particle size of the metal magnetic powder.

[0210] In the third and fourth embodiments, the insulating portion may be omitted. On the other hand, in the first and second embodiments, the insulating portion may be provided. In addition, a part of the insulating portion may be omitted. For example, in the third embodiment, only the second insulating portion 272 of the insulating portion 270 may be provided.

[0211] In the above-mentioned first embodiment, second embodiment, and third embodiment, a structure including an external terminal and a covering layer may be provided.

[0212] In the fourth embodiment, the structures of the first external terminal 391 , the second external terminal 392 , the third external terminal 393 , the fourth external terminal 394 , and the fifth external terminal 395 are not limited to those in the fourth embodiment. For example, they may be formed only of a copper layer.

[0213] In the fourth embodiment, one of the first external terminal 391 and the fourth external terminal 394 may be omitted. Similarly, one of the third external terminal 393 and the fifth external terminal 395 may be omitted. At least one external terminal that functions as the first external terminal and the third external terminal may be provided.

[0214] In the above embodiments, the number of first vertical wirings is not limited to the examples in the above embodiments. For example, in the first embodiment, the first vertical wirings may penetrate the second layer L2 and be connected to the lower surface of the first pad 22 of the inductor wiring 20 .

[0215] In the above-mentioned embodiments, the shape of the first vertical wiring is not limited to the examples in the above-mentioned embodiments, and may be, for example, a polygonal prism or a mixed shape of a circular column and a polygonal prism.

[0216] In each of the above embodiments, the vertical wiring includes wiring that penetrates the insulating layer and wiring that penetrates the magnetic layer. Therefore, the vertical wiring may be, for example, only a columnar wiring that penetrates the magnetic layer from the end of the inductor wiring to the outer surface of the magnetic layer, or the columnar wiring that penetrates the magnetic layer to the outer surface of the magnetic layer may be connected to the end of the inductor wiring via a through hole that penetrates the insulating layer. In addition, the components constituting the vertical wiring may not be integrated with each other, and the vertical wiring and the inductor wiring may not be integrated.

[0217] In the above-mentioned embodiment of the inductor component mounting substrate, the inductor component mounted is not limited to the inductor component 10 in the first embodiment. For example, the inductor component 310 in the fourth embodiment may be mounted.

[0218] In the above-mentioned embodiments of the inductor component mounting substrate, the input wiring may be connected to the external terminal. For example, when the inductor component 310 in the fourth embodiment is mounted, the first input wiring 420A may be connected to the first external terminal 391 or the fourth external terminal 394 functioning as the first external terminal, and the second input wiring 420B may be connected to the third external terminal 393 or the fifth external terminal 395 functioning as the third external terminal.

Claims

1. An inductor component, wherein: have: The first inductor wiring and the second inductor wiring are arranged inside the magnetic layer, and current flows in the same direction between a first end portion on one side of the extending direction and a second end portion on the other side; a first vertical wiring connected to the first end of the first inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; a second vertical wiring connected to the second end of the first inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; as well as a third vertical wiring connected to the first end of the second inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer, The second vertical wiring is connected to the second end of the second inductor wiring. The first inductor wiring and the second inductor wiring have a wiring body extending on a plane, a first pad connected to the wiring body and constituting the first end, and a second pad connected to the wiring body and constituting the second end. The length of the wiring main body in the first inductor wiring is different from the length of the wiring main body in the second inductor wiring. The first inductor wiring and the second inductor wiring are arranged in the same layer, The second end portion of the first inductor wiring serves as the second end portion of the second inductor wiring.

2. The inductor component according to claim 1, wherein: The first inductor wiring and the second inductor wiring are bent and extended in a manner of protruding along a first direction parallel to the magnetic layer and toward a second direction orthogonal to the first direction. The first inductor wiring has a different bending radius than the second inductor wiring, so that the length of the wiring main body in the first inductor wiring and the length of the wiring main body in the second inductor wiring are different.

3. The inductor component according to claim 1 or 2, wherein: Also available: a third inductor wiring arranged inside the magnetic layer, wherein a current flows between a first end portion on one side of the extending direction and a second end portion on the other side in the same direction as the first inductor wiring and the second inductor wiring; a fourth vertical wiring connected to the first end of the third inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; as well as A fifth vertical wiring is connected to the second end of the third inductor wiring, penetrates the magnetic layer, and is exposed on an outer surface of the magnetic layer.

4. The inductor component according to claim 3, wherein: There are a plurality of the third inductor wiring and a plurality of the fourth vertical wiring.

5. The inductor component according to claim 1, wherein: The first inductor wiring and the second inductor wiring are arranged in different layers, The second vertical wiring is arranged in a layer between a layer where the first inductor wiring is arranged and a layer where the second inductor wiring is arranged.

6. An inductor component, wherein: have: The first inductor wiring, the second inductor wiring, and the third inductor wiring are arranged inside the magnetic layer, and current flows in the same direction between a first end portion on one side of the extending direction and a second end portion on the other side; a first vertical wiring connected to the first end of the first inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; a second vertical wiring connected to the second end of the first inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; a third vertical wiring connected to the first end of the second inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; as well as a fourth vertical wiring connected to the first end of the third inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer, The second vertical wiring is connected to the second end of the second inductor wiring. The first inductor wiring, the second inductor wiring, and the third inductor wiring have a wiring body, a first pad connected to the wiring body and constituting the first end, and a second pad connected to the wiring body and constituting the second end. The first inductor wiring, the second inductor wiring, and the third inductor wiring are arranged in the same layer, the second pad of the first inductor wiring becomes the second pad of the second inductor wiring, and becomes the second pad of the third inductor wiring, At least a portion of the wiring main body in each inductor wiring extending from one end on the second pad side extends radially. When the total number of the first inductor wiring, the second inductor wiring, and the third inductor wiring connected via the second pad is N, An angular interval θ between adjacent inductor wirings in a radially extending portion of each of the inductor wirings is 360 / 2N<θ<360 / 0.5N.

7. The inductor component according to claim 6, wherein: There are a plurality of the third inductor wiring and a plurality of the fourth vertical wiring.

8. The inductor component according to claim 1 or 6, wherein: When viewed from a direction perpendicular to the layer of the first inductor wiring, the second vertical wiring is located closer to the center of the layer of the first inductor wiring than the first end of the first inductor wiring and the first end of the second inductor wiring.

9. The inductor component according to claim 1 or 6, wherein: The first inductor wiring and the second inductor wiring include a wiring main body, a first pad connected to the wiring main body and constituting the first end, and a second pad connected to the wiring main body and constituting the second end. The length of the wiring main body in the first inductor wiring is equal to the length of the wiring main body in the second inductor wiring.

10. The inductor component according to claim 1 or 6, wherein: The number of turns of the first inductor wiring and the second inductor wiring is less than 1.0 turn.

11. The inductor component according to claim 1 or 6, wherein: The magnetic layer comprises resin and metal magnetic powder. The minimum distance between the first end portions is at least 20 times the average particle size of the metal magnetic powder.

12. The inductor component according to claim 1 or 6, wherein: At least a portion of the outer surfaces of the first inductor wiring and the second inductor wiring is covered with an insulating resin having higher insulation properties than the first inductor wiring and the second inductor wiring.

13. An inductor component, wherein: have: The first inductor wiring and the second inductor wiring are arranged inside the magnetic layer, and current flows in the same direction between a first end portion on one side of the extending direction and a second end portion on the other side; a first vertical wiring connected to the first end of the first inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; a second vertical wiring connected to the second end of the first inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; a third vertical wiring connected to the first end of the second inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer, a fourth vertical wiring connected to the second end of the second inductor wiring, penetrating the magnetic layer and exposed on the outer surface of the magnetic layer; a first external terminal connected to a portion of the first vertical wiring exposed on an outer surface of the magnetic layer; a second external terminal connected to a portion of the second vertical wiring exposed on the outer surface of the magnetic layer; as well as a third external terminal connected to a portion of the third vertical wiring exposed on the outer surface of the magnetic layer, The second external terminal is connected to the fourth vertical wiring. The first inductor wiring and the second inductor wiring have a wiring body extending on a plane, a first pad connected to the wiring body and constituting the first end, and a second pad connected to the wiring body and constituting the second end. The length of the wiring main body in the first inductor wiring is different from the length of the wiring main body in the second inductor wiring.

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