Coil component and coil built-in substrate

Abstract

A coil component of the present disclosure includes a primary winding that generates a magnetic field using an input current from the outside, and a secondary winding that flows an induced current generated by the magnetic field. The primary winding includes a plurality of primary-side first looped portions and a plurality of primary-side second looped portions each of which is ring-shaped as viewed in a first direction. The secondary winding includes a plurality of secondary-side first looped portions and a plurality of secondary-side second looped portions each of which is ring-shaped as viewed in the first direction. The plurality of primary-side first looped portions and the plurality of secondary-side first looped portions are alternately arranged in the first direction, constituting a first cylindrical portion. The plurality of primary-side second looped portions and the plurality of secondary-side second looped portions are alternately arranged in the first direction, constituting a second cylindrical portion. The second cylindrical portion is located inward of the first cylindrical portion as viewed in the first direction. The flow direction of the input current flowing in each of the plurality of primary-side first looped portions is the same as the flow direction of the input current flowing in each of the plurality of primary-side second looped portions.

Description

Technical Field

[0001] This disclosure relates to coil components and coil-embedded substrates. Background Technology

[0002] Coil components such as inductors or transformers are mounted in various electronic devices. For example, Patent Document 1 discloses coil components (inductors and transformers) using helical coils.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent document 1: Japanese Patent Application Publication No. 2011-124250. Summary of the Invention

[0006] The problem the invention aims to solve

[0007] It is generally believed that the less magnetic flux leakage in an inductor or transformer, the better. This is because such leakage can lead to the generation of radiated noise or heat.

[0008] This disclosure was made in view of the above circumstances, and its object is to provide a coil component for suppressing magnetic flux leakage and a coil-embedded substrate having the coil component.

[0009] Technical means for solving problems

[0010] According to a first aspect of this disclosure, the coil component includes: a primary winding for generating a magnetic field using an input current from an external source; and a secondary winding through which an induced current generated by the magnetic field flows. The primary winding includes a plurality of primary-side first winding portions and a plurality of primary-side second winding portions, which are annular in a first direction. The secondary winding includes a plurality of secondary-side first winding portions and a plurality of secondary-side second winding portions, which are annular in the first direction. The plurality of primary-side first winding portions and the plurality of secondary-side first winding portions are alternately arranged in the first direction to form a first cylindrical portion. The plurality of primary-side second winding portions and the plurality of secondary-side second winding portions are alternately arranged in the first direction to form a second cylindrical portion. The second cylindrical portion is located inside the first cylindrical portion in the first direction. The direction of the input current flowing through each of the plurality of primary-side first winding portions is the same as the direction of the input current flowing through each of the plurality of primary-side second winding portions.

[0011] According to a second aspect of this disclosure, a coil component includes a coil that generates a magnetic field using an input current from an external source. The coil includes a plurality of first surrounding portions and a plurality of second surrounding portions, which are annular when viewed in a first direction. The plurality of first surrounding portions are arranged in the first direction to form a first cylindrical portion. The plurality of second surrounding portions are arranged in the first direction to form a second cylindrical portion. The second cylindrical portion is located inside the first cylindrical portion when viewed in the first direction. The first and second cylindrical portions are annular when viewed in a thickness direction orthogonal to the first direction. The direction of the input current flowing through each of the plurality of first surrounding portions is the same as the direction of the input current flowing through each of the plurality of second surrounding portions.

[0012] According to a third aspect of this disclosure, a coil-embedded substrate has a coil component provided by either the first aspect or the second aspect embedded therein. The coil-embedded substrate includes: a plurality of wiring layers stacked in the thickness direction; and a plurality of insulating layers existing between the plurality of wiring layers in the thickness direction. The coil component is formed by wiring patterns in the plurality of wiring layers.

[0013] Invention Effects

[0014] The coil component and coil-embedded substrate disclosed herein can suppress magnetic flux leakage. Attached Figure Description

[0015] Figure 1 This is a perspective view showing the coil component of the first embodiment.

[0016] Figure 2 It is Figure 1 A magnified portion of the image.

[0017] Figure 3 This is a top view showing the coil component of the first embodiment.

[0018] Figure 4 It is along Figure 3 End face view of the cut section of line IV-IV.

[0019] Figure 5 Is Figure 1 In the 3D diagram shown, using Figure 4 The tangential section (along) Figure 3 The diagram shows the cross-section of line IV-IV.

[0020] Figure 6 This is a bottom view showing the coil component of the first embodiment.

[0021] Figure 7 Is Figure 1The three-dimensional diagram shown omits a portion (part of the first cylindrical section).

[0022] Figure 8 This is a perspective view showing the primary winding of the coil component in the first embodiment.

[0023] Figure 9 This is a top view showing a primary winding in the coil components of the first embodiment.

[0024] Figure 10 It is viewed along the circumference. Figure 8 and Figure 9 The diagram shown is a schematic of the primary winding.

[0025] Figure 11 This is a perspective view showing the secondary winding in the coil component of the first embodiment.

[0026] Figure 12 This is a top view showing the secondary winding in the coil component of the first embodiment.

[0027] Figure 13 It is viewed along the circumference. Figure 11 and Figure 12 A schematic diagram of the secondary winding.

[0028] Figure 14 This is a schematic diagram showing a portion of the primary and secondary windings, illustrating connection examples for each connection part.

[0029] Figure 15 This is a perspective view showing the coil-embedded substrate of the first embodiment.

[0030] Figure 16 This is a top view showing the coil-embedded substrate of the first embodiment.

[0031] Figure 17 It is along Figure 16 A cross-sectional view of the XVII-XVII line.

[0032] Figure 18 This is a perspective view showing the coil component of the second embodiment.

[0033] Figure 19 It is Figure 18 A magnified portion of the image.

[0034] Figure 20 This is a top view showing the coil component of the second embodiment.

[0035] Figure 21 It is along Figure 20 End face view of the cut section of the XXI-XXI line.

[0036] Figure 22 This is a bottom view showing the coil component of the second embodiment.

[0037] Figure 23 Is Figure 18 The three-dimensional diagram shown omits a portion (part of the first cylindrical section).

[0038] Figure 24 This is a schematic diagram of the coil of the coil component in the second embodiment when viewed circumferentially.

[0039] Figure 25 This is a perspective view showing the coil-embedded substrate of the second embodiment.

[0040] Figure 26 This is a top view showing the coil-embedded substrate of the second embodiment.

[0041] Figure 27 It is along Figure 26 Cross-sectional view of line XXVII-XXVII. Detailed Implementation

[0042] Hereinafter, preferred embodiments of the coil component and coil-embedded substrate of the present disclosure will be described with reference to the accompanying drawings. In the following description, the same or similar components will be labeled with the same symbols and repeated descriptions will be omitted.

[0043] Regarding the coil component A1 of the first embodiment, refer to Figures 1 to 14 The following description will be provided. The coil component A1 is, for example, a transformer, including a primary winding 1 and a secondary winding 2. The coil component A1 may have a magnetic core, but is preferably a hollow core without a magnetic core. The coil component A1 is, for example, ring-shaped. The planar shape of the coil component A1 is essentially a single loop, preferably a circular ring, an elliptical ring, or a polygonal ring. Furthermore, the planar shape of the coil component A1 does not necessarily have to be a single loop. The cross-sectional shape of the coil component A1 is essentially a single loop, preferably a circular ring, an elliptical ring, or a polygonal ring. The overall shape of the coil component A1 is composed of various combinations of the above-described planar shape and cross-sectional shape. In the first embodiment, the case where the planar shape is a ring and the cross-sectional shape is a rectangular ring will be described as an example. For ease of explanation, in the top view of the coil component A1, the direction extending from the central axis is referred to as the axial direction s, the direction around the central axis is referred to as the circumferential direction t, and the direction extending radially from the central axis is referred to as the radial direction u. The axial direction s corresponds to the thickness direction of the coil component A1. The circumferential direction t aligns with the annular direction of coil component A1. Furthermore, the aforementioned cross-sectional shape corresponds to a cross-section on a plane defined by the axial direction s and the radial direction u. The circumferential direction t corresponds to the "first direction," and the axial direction s corresponds to the "thickness direction."

[0044] Figure 1This is a three-dimensional view of coil component A1. Figure 2 It is Figure 1 A magnified version of a portion of the image. Figure 3 This is a top view showing coil component A1. Figure 4 It is along Figure 3 End face view of the cut section of line IV-IV. Figure 5 yes Figure 1 The 3D diagram shown is composed of Figure 4 The cut surface (along) Figure 3 A cross-section of line IV-IV (cutaway diagram). Furthermore, Figure 5 The part that the lieutenant general cut off is represented by an imaginary line (two-dot dashed line). Figure 6 This is a bottom view showing coil component A1. Figure 7 Is Figure 1 The perspective view shown has a portion (part of the first cylindrical portion 5A described later) omitted. Figure 8 This is a three-dimensional view showing the primary winding 1 in coil component A1.

[0045] Figure 9 This is a top view showing the primary winding 1 in coil component A1. Figure 10 It is viewed along the circumferential direction t. Figure 8 and Figure 9 The diagram shown is a schematic diagram of the first winding 1. Figure 11 This is a three-dimensional view showing the secondary winding 2 in coil component A1. Figure 12 This is a top view showing the secondary winding 2 in coil component A1. Figure 13 It is viewed along the circumferential direction t. Figure 11 and Figure 12 A schematic diagram of the secondary winding 2. Figure 14 This is a schematic diagram showing a portion of the primary winding 1 and the secondary winding 2, illustrating a connection example between the connecting part 13 (described later) and the connecting part 23 (described later). Furthermore, in Figures 1 to 13 The connecting parts 13 and 23 are omitted. Figure 14 (a) is a diagram viewed from the outside of radial u to the inside of radial u. Figure 14 (b) and Figure 14 (c) is a diagram viewed from both sides of the circumference t, and Figure 14 (d) and Figure 14 (e) is a diagram viewed from both sides of the axial direction s.

[0046] Coil component A1 is alternately and double-wound by a primary winding 1 and a secondary winding 2. Coil component A1, by being double-wound by both the primary winding 1 and the secondary winding 2, includes a first cylindrical portion 5A and a second cylindrical portion 5B. The first cylindrical portion 5A and the second cylindrical portion 5B are both annular in shape. The second cylindrical portion 5B is as follows... Figure 7As shown, it is located inside the first cylindrical portion 5A. The first cylindrical portion 5A forms the appearance of the coil component A1. The planar shape of both the first cylindrical portion 5A and the second cylindrical portion 5B is, for example, annular, and their central axes are common. That is, the central axis of the first cylindrical portion 5A when viewed from above is approximately the same as the central axis of the second cylindrical portion 5B when viewed from above. The extending direction of this central axis corresponds to the axial direction s. In addition, the cross-sectional shape of both the first cylindrical portion 5A and the second cylindrical portion 5B is, for example, a rectangular annular shape.

[0047] Primary winding 1 generates a magnetic field using an externally input current. Primary winding 1 is as follows: Figures 8-10 and Figure 14 As shown, it includes a plurality of first surrounding portions 11, a plurality of second surrounding portions 12, and a connecting portion 13. The first surrounding portion 11 corresponds to the "first surrounding portion on the primary side", the second surrounding portion 12 corresponds to the "second surrounding portion on the primary side", and the connecting portion 13 corresponds to the "connecting portion on the primary side".

[0048] Multiple first surrounding parts 11 respectively as follows Figure 10 As shown, the shape when viewed along the circumferential direction t is, for example, a rectangular ring. Multiple first surrounding portions 11 are as follows... Figure 9 As shown, they are arranged circumferentially in the direction t when viewed from the axial direction s. The plurality of first surrounding portions 11 are part of the first cylindrical portion 5A. The plurality of first surrounding portions 11 are as follows... Figure 10 As shown, it includes a first upper conductor portion 111, a first lower conductor portion 112, and a pair of first connecting conductor portions 113 and 114. The first upper conductor portion 111 corresponds to the "first upper conductor portion on the primary side", the first lower conductor portion 112 corresponds to the "first lower conductor portion on the primary side", and the pair of first connecting conductor portions 113 and 114 corresponds to the "pair of first connecting conductor portions on the primary side".

[0049] In each of the first surrounding portions 11, the first upper conductor portion 111 and the first lower conductor portion 112 are as follows: Figure 10 As shown, they are spaced apart along the axial direction s. The first upper conductor portion 111 and the first lower conductor portion 112 are respectively as shown... Figure 9 As shown, viewed along the axial direction s, the conductors extend from the inner periphery 51A of the first cylindrical portion 5A to the outer periphery 52A of the first cylindrical portion 5A. The first upper conductor portion 111 and the first lower conductor portion 112 are respectively strip-shaped when viewed along the axial direction s. A pair of first connecting conductor portions 113 and 114 are respectively as shown... Figure 10The first upper conductor portion 111 extends along the axial direction s. The first connecting conductor portion 113 is connected to the first lower conductor portion 112 of the same first surrounding portion 11. The first connecting conductor portion 114 is connected to the first lower conductor portion 112 of the adjacent first surrounding portion 11 in the circumferential direction t. The pair of first connecting conductor portions 113 and 114 are approximately orthogonal to the first upper conductor portion 111 and the first lower conductor portion 112, respectively. The first connecting conductor portion 113 overlaps with the inner periphery 51A of the first cylindrical portion 5A when viewed in the axial direction s, and the first connecting conductor portion 114 overlaps with the outer periphery 52A of the first cylindrical portion 5A when viewed in the axial direction s. When viewed in the radial direction u, the pair of first connecting conductor portions 113 and 114 are strips extending in the axial direction s.

[0050] In this embodiment, each of the first upper conductor portions 111 is inclined relative to the radial direction u towards the circumferential direction t, and each of the first lower conductor portions 112 is inclined relative to the radial direction u towards the circumferential direction t. Figure 9 In the example shown, the radial direction u overlapping each of the first connecting conductor portions 113 is designated as radial u11, and the first upper conductor portion 111 connected to the first connecting conductor portion 113 is inclined clockwise relative to radial u11 in the circumferential direction t. Furthermore, the first lower conductor portion 112 connected to the first connecting conductor portion 113 is inclined counterclockwise relative to radial u11 in the circumferential direction t. In this way, the first upper conductor portion 111 and the first lower conductor portion 112 are inclined to opposite sides relative to radial u in the circumferential direction t, thereby enabling a pair of first connecting conductor portions 113 and 114 to be formed along the axial direction s.

[0051] Furthermore, in this embodiment, the two adjacent first upper conductor portions 111 in the circumferential direction t and the two adjacent first lower conductor portions 112 in the circumferential direction t are respectively arranged with a predetermined interval between them. This interval is, for example, approximately the same on the inner periphery 51A side and the outer periphery 52A side of the first cylindrical portion 5A. With this structure, when viewed in the axial direction s, the dimension of the first connecting conductor portion 114 along the circumferential direction t is larger than the dimension of the first connecting conductor portion 113 along the circumferential direction t.

[0052] In the plurality of first winding portions 11, two adjacent first winding portions 11 in the circumferential direction t are directly connected to each other, and the input current flowing in the primary winding 1 flows sequentially through the plurality of first winding portions 11. At this time, the first connecting conductor portion 114 of each first winding portion 11 transmits the input current from the first lower conductor portion 112 of the first winding portion 11 adjacent to it in the circumferential direction t. Furthermore, this input current flows from the first connecting conductor portion 114 through the first upper conductor portion 111 and the first connecting conductor portion 113 to the first lower conductor portion 112. That is, in Figure 10In the example shown, the input current flowing to each of the first winding portions 11 flows counterclockwise. It is then transmitted to the adjacent first winding portion 11 on the other side of the circumferential direction t. In this way, the input current of the primary winding 1 completes one revolution in each of the multiple first winding portions 11. Furthermore, the direction of the input current flowing to the first winding portion 11 can also be reversed from the example described above. That is, the first lower conductor portion 112 of each first winding portion 11 receives the input current from the first connecting conductor portion 114 of the adjacent first winding portion 11 on the other side of the circumferential direction t. This input current flows from the first lower conductor portion 112 via the first connecting conductor portion 113 and the first upper conductor portion 111 to the first connecting conductor portion 114. That is, in Figure 10 In the example shown, the structure could also be that the input current flowing in each of the first surrounding portions 11 flows clockwise.

[0053] Multiple second surrounding portions 12 respectively as follows Figure 10 As shown, the shape when viewed along the circumferential direction t is, for example, a rectangular ring. Each of the second surrounding portions 12 is as follows: Figure 10 As shown, when viewed along the circumferential direction t, it is located inside each of the first surrounding portions 11. Multiple second surrounding portions 12 are as follows... Figure 9 As shown, they are arranged in the circumferential direction t when viewed along the axial direction s. The second surrounding portion 12 is part of the second cylindrical portion 5B. The plurality of first surrounding portions 11 and the plurality of second surrounding portions 12 are as follows... Figure 8 and Figure 9 As shown, they are alternately arranged in the circumferential direction t when viewed along the axial direction s. For example... Figure 10 The plurality of second surrounding portions 12 shown include a second upper conductor portion 121, a second lower conductor portion 122, and a pair of second connecting conductor portions 123 and 124. The second upper conductor portion 121 corresponds to the "second upper conductor portion on the primary side", the second lower conductor portion 122 corresponds to the "second lower conductor portion on the primary side", and the pair of second connecting conductor portions 123 and 124 corresponds to the "pair of second connecting conductor portions on the primary side".

[0054] In each of the second surrounding portions 12, such as Figure 10 As shown, the second upper conductor portion 121 and the second lower conductor portion 122 are spaced apart in the axial direction s. Figure 9 As shown, the second upper conductor portion 121 and the second lower conductor portion 122 extend from the inner periphery 51B of the second cylindrical portion 5B to the outer periphery 52B of the second cylindrical portion 5B when viewed in the axial direction s. The second upper conductor portion 121 and the second lower conductor portion 122 are both strip-shaped when viewed in the axial direction s. Figure 10As shown, a pair of second connecting conductor portions 123 and 124 extend from the second upper conductor portion 121 along the axial direction s. The second connecting conductor portion 123 is connected to the second lower conductor portion 122 of the same second surrounding portion 12. The second connecting conductor portion 124 is connected to the second lower conductor portion 122 of the adjacent second surrounding portion 12 in the circumferential direction t. The pair of second connecting conductor portions 123 and 124 are approximately orthogonal to the second upper conductor portion 121 and the second lower conductor portion 122, respectively. The second connecting conductor portion 123 overlaps with the inner periphery 51B of the second cylindrical portion 5B when viewed in the axial direction s, and the second connecting conductor portion 124 overlaps with the outer periphery 52B of the second cylindrical portion 5B when viewed in the axial direction s. When viewed in the radial direction u, the pair of second connecting conductor portions 123 and 124 are strips extending in the axial direction s.

[0055] In this embodiment, each of the second upper conductor portions 121 is inclined relative to the radial direction u towards the circumferential direction t, and each of the second lower conductor portions 122 is inclined relative to the radial direction u towards the circumferential direction t. Figure 9 In the example shown, the radial direction u overlapping each of the second connecting conductor portions 123 is designated as radial u12, and the second upper conductor portion 121 connected to the second connecting conductor portion 123 is inclined clockwise relative to radial u12 in the circumferential direction t. Furthermore, the second lower conductor portion 122 connected to the second connecting conductor portion 123 is inclined counterclockwise relative to radial u12 in the circumferential direction t. In this way, the second upper conductor portion 121 and the second lower conductor portion 122 are inclined to opposite sides relative to radial u in the circumferential direction t, thereby enabling a pair of second connecting conductor portions 123 and 124 to be formed along the axial direction s.

[0056] Furthermore, in this embodiment, the two adjacent second upper conductor portions 121 in the circumferential direction t and the two adjacent second lower conductor portions 122 in the circumferential direction t are respectively arranged at a predetermined interval. This interval is, for example, approximately the same on the inner periphery 51B side and the outer periphery 52B side of the second cylindrical portion 5B. With this structure, when viewed in the axial direction s, the dimension of the second connecting conductor portion 124 along the circumferential direction t is larger than the dimension of the second connecting conductor portion 123 along the circumferential direction t.

[0057] In the plurality of second winding portions 12, two adjacent second winding portions 12 in the circumferential direction t are directly connected to each other, and the input current flowing in the primary winding 1 flows sequentially through the plurality of second winding portions 12. At this time, the second connecting conductor portion 124 of each second winding portion 12 transmits the input current from the second lower conductor portion 122 of the second winding portion 12 adjacent to one side in the circumferential direction t. Furthermore, this input current flows from the second connecting conductor portion 124 through the second upper conductor portion 121 and the second connecting conductor portion 123 into the second lower conductor portion 122. That is, in Figure 10In the example shown, the input current flowing into each of the second winding portions 12 flows counterclockwise. Therefore, the direction of the input current flowing into each of the first winding portions 11 is the same as the direction of the input current flowing into each of the second winding portions 12 when viewed along the circumferential direction t. In this way, the input current to the primary winding 1 completes one revolution in each of the multiple second winding portions 12. Furthermore, the direction of the input current flowing into the second winding portion 12 can also be the opposite of the example described above. That is, the second lower conductor portion 122 of each second winding portion 12 receives the input current from the second connecting conductor portion 124 of the second winding portion 12 adjacent on the other side of the circumferential direction t. And this input current flows from the second lower conductor portion 122 through the second connecting conductor portion 123 and the second upper conductor portion 121 to the second connecting conductor portion 124. That is, in Figure 10 In the example shown, the input current flowing into each of the second surrounding portions 12 can also be arranged in a clockwise direction. However, the direction of the input current flowing into each of the first surrounding portions 11 and the direction of the input current flowing into each of the second surrounding portions 12 are considered to be in the same direction along the circumferential direction t.

[0058] The connecting portion 13 connects one of the plurality of first surrounding portions 11 to one of the plurality of second surrounding portions 12. For example, the connecting portion 13 is as follows: Figure 14 As shown, it is connected to one of the first lower conductor portions 112 among the plurality of first surrounding portions 11 and one of the second upper conductor portions 121 among the plurality of second surrounding portions 12, so that they are connected.

[0059] In the primary winding 1, multiple first winding portions 11 are continuously connected along the circumferential direction t, and multiple second winding portions 12 are continuously connected along the circumferential direction t. Furthermore, they are connected via a connecting portion 13. Thus, the input current of the primary winding 1 is input to the multiple second winding portions 12 via the connecting portion 13 after the multiple first winding portions 11 have completed one revolution, and then completes one revolution in each of the multiple second winding portions 12.

[0060] Due to the influence of the magnetic field generated by the primary winding 1, induced current flows through the secondary winding 2. The secondary winding 2, as... Figures 11-14 As shown, it includes multiple first surrounding portions 21, multiple second surrounding portions 22, and a connecting portion 23. The first surrounding portion 21 corresponds to the "secondary side first surrounding portion", the second surrounding portion 22 corresponds to the "secondary side second surrounding portion", and the connecting portion 23 corresponds to the "secondary side connecting portion".

[0061] Multiple first surrounding portions 21 respectively as follows Figure 13 As shown, the shape when viewed along the circumferential direction t is, for example, a rectangular ring. Multiple first surrounding portions 21 are as follows... Figure 12As shown, they are arranged in the circumferential direction t when viewed in the axial direction s. A plurality of first surrounding portions 21 are part of the first cylindrical portion 5A. Each of the plurality of first surrounding portions 21 includes a first upper conductor portion 211, a first lower conductor portion 212, and a pair of first connecting conductor portions 213 and 214. The first upper conductor portion 211 corresponds to the "secondary-side first upper conductor portion", the first lower conductor portion 212 corresponds to the "secondary-side first lower conductor portion", and the pair of first connecting conductor portions 213 and 214 corresponds to the "pair of secondary-side first connecting conductor portions".

[0062] In each of the first surrounding portions 21, such as Figure 13 As shown, the first upper conductor portion 211 and the first lower conductor portion 212 are spaced apart in the axial direction s. Figure 12 As shown, the first upper conductor portion 211 and the first lower conductor portion 212, viewed along the axial direction s, extend from the inner periphery 51A of the first cylindrical portion 5A to the outer periphery 52A of the first cylindrical portion 5A. The first upper conductor portion 211 and the first lower conductor portion 212 are both strip-shaped when viewed along the axial direction s. Figure 13 As shown, a pair of first connecting conductor portions 213 and 214 extend from the first upper conductor portion 211 along the axial direction s. The first connecting conductor portion 213 is connected to the first lower conductor portion 212 of the same first surrounding portion 21. The first connecting conductor portion 214 is connected to the first lower conductor portion 212 of the adjacent first surrounding portion 21 in the circumferential direction t. The pair of first connecting conductor portions 213 and 214 are approximately orthogonal to the first upper conductor portion 211 and the first lower conductor portion 212, respectively. The first connecting conductor portion 213 overlaps with the inner periphery 51A of the first cylindrical portion 5A when viewed in the axial direction s, and the first connecting conductor portion 214 overlaps with the outer periphery 52A of the first cylindrical portion 5A when viewed in the axial direction s. When viewed in the radial direction u, the pair of first connecting conductor portions 213 and 214 are strips extending in the axial direction s.

[0063] In this embodiment, each of the first upper conductor portions 211 is inclined relative to the radial direction u towards the circumferential direction t, and each of the first lower conductor portions 212 is inclined relative to the radial direction u towards the circumferential direction t. Figure 12 In the example shown, the radial direction u overlapping each of the first connecting conductor portions 213 is designated as radial u21, and the first upper conductor portion 211 connected to the first connecting conductor portion 213 is inclined clockwise relative to radial u21 in the circumferential direction t. Furthermore, the first lower conductor portion 212 connected to the first connecting conductor portion 213 is inclined counterclockwise relative to radial u21 in the circumferential direction t. In this way, the first upper conductor portion 211 and the first lower conductor portion 212 are inclined to opposite sides relative to radial u in the circumferential direction t, thereby enabling a pair of first connecting conductor portions 213 and 214 to be formed along the axial direction s.

[0064] Furthermore, in this embodiment, the two adjacent first upper conductor portions 211 in the circumferential direction t and the two adjacent first lower conductor portions 212 in the circumferential direction t are respectively arranged with a predetermined interval between them. This interval is approximately the same on, for example, the inner perimeter 51A side and the outer perimeter 52A side. According to this structure, when viewed in the axial direction s, the dimension of the first connecting conductor portion 214 along the circumferential direction t is larger than the dimension of the first connecting conductor portion 213 along the circumferential direction t.

[0065] In the plurality of first winding portions 21, two adjacent first winding portions 21 in the circumferential direction t are directly connected to each other, and the induced current flowing in the secondary winding 2 flows sequentially through the plurality of first winding portions 21. At this time, the first connecting conductor portion 214 of each first winding portion 21 transmits the induced current from the first lower conductor portion 212 of the first winding portion 21 adjacent to it in the circumferential direction t. Furthermore, this induced current flows from the first connecting conductor portion 214 through the first upper conductor portion 211 and the first connecting conductor portion 213 to the first lower conductor portion 212. That is, in Figure 13 In the example shown, the induced current flowing in each of the first winding portions 21 flows counterclockwise. It is then transmitted to the adjacent first winding portion 21 on the other side of the circumferential direction t. In this way, the induced current of the secondary winding 2 completes one revolution in each of the multiple first winding portions 21. Furthermore, the direction of the induced current flowing in the first winding portions 21 can also be reversed from the example described above. That is, the induced current is transmitted from the first lower conductor portion 212 of each of the first winding portions 21 to the first connecting conductor portion 214 of the adjacent first winding portion 21 on the other side of the circumferential direction t. This induced current flows from the first lower conductor portion 212 via the first connecting conductor portion 213 and the first upper conductor portion 211 to the first connecting conductor portion 214. That is, in Figure 13 In the example shown, the induced current flowing in each of the first winding portions 21 can also be arranged in a clockwise direction. Furthermore, the direction of the induced current flowing in each of the first winding portions 21 is determined by the magnetic field generated by the primary winding 1.

[0066] Multiple second surrounding portions 22 respectively as follows Figure 13 As shown, the shape when viewed along the circumferential direction t is, for example, a rectangular ring. Each of the second surrounding portions 22 is as follows: Figure 13 As shown, when viewed along the circumferential direction t, it is located inside each of the first surrounding portions 21. The plurality of second surrounding portions 22 are as follows... Figure 12 As shown, they are arranged in the circumferential direction t when viewed from the axial direction s. The second surrounding portion 22 is part of the second cylindrical portion 5B. The plurality of first surrounding portions 21 and the plurality of second surrounding portions 22 are as follows... Figure 11 and Figure 12 As shown, they are arranged alternately in the circumferential direction t when viewed from the axial direction s. The plurality of second surrounding portions 22 are respectively as shown in... Figure 13As shown, it includes a second upper conductor portion 221, a second lower conductor portion 222, and a pair of second connecting conductor portions 223 and 224. The second upper conductor portion 221 corresponds to the "secondary side second upper conductor portion", the second lower conductor portion 222 corresponds to the "secondary side second lower conductor portion", and the pair of second connecting conductor portions 223 and 224 corresponds to the "pair of secondary side second connecting conductor portions".

[0067] In each of the second surrounding portions 22, the second upper conductor portion 221 and the second lower conductor portion 222 are as follows: Figure 13 As shown, they are spaced apart along the axial direction s. The second upper conductor portion 221 and the second lower conductor portion 222 are respectively as shown... Figure 12 As shown, viewed along the axial direction s, it extends from the inner periphery 51B of the second cylindrical portion 5B to the outer periphery 52B of the second cylindrical portion 5B. The second upper conductor portion 221 and the second lower conductor portion 222 are respectively strip-shaped when viewed along the axial direction s. A pair of second connecting conductor portions 223 and 224 are respectively as shown... Figure 13 As shown, the second upper conductor portion 221 extends along the axial direction s. The second connecting conductor portion 223 is connected to the second lower conductor portion 222 of the same second surrounding portion 22. The second connecting conductor portion 224 is connected to the second lower conductor portion 222 of the adjacent second surrounding portion 22 in the circumferential direction t. The pair of second connecting conductor portions 223 and 224 are approximately orthogonal to the second upper conductor portion 221 and the second lower conductor portion 222, respectively. The second connecting conductor portion 223 overlaps with the inner periphery 51B of the second cylindrical portion 5B when viewed along the axial direction s, and the second connecting conductor portion 224 overlaps with the outer periphery 52B of the second cylindrical portion 5B when viewed along the axial direction s. The pair of second connecting conductor portions 223 and 224 are strips extending along the axial direction s when viewed along the radial direction u.

[0068] In this embodiment, each of the second upper conductor portions 221 is inclined relative to the radial direction u towards the circumferential direction t, and each of the second lower conductor portions 222 is inclined relative to the radial direction u towards the circumferential direction t. Figure 12 In the example shown, the radial direction u overlapping each of the second connecting conductor portions 223 is designated as radial u22, and the second upper conductor portion 221 connected to the second connecting conductor portion 223 is inclined clockwise relative to radial u22 in the circumferential direction t. Furthermore, the second lower conductor portion 222 connected to the second connecting conductor portion 223 is inclined counterclockwise relative to radial u22 in the circumferential direction t. In this way, the second upper conductor portion 221 and the second lower conductor portion 222 are inclined to opposite sides relative to radial u in the circumferential direction t, thereby enabling a pair of second connecting conductor portions 223 and 224 to be formed along the axial direction s.

[0069] Furthermore, in this embodiment, the two adjacent second upper conductor portions 221 in the circumferential direction t and the two adjacent second lower conductor portions 222 in the circumferential direction t are respectively arranged at a predetermined interval. This interval is approximately the same on the inner perimeter 51B side and the outer perimeter 52B side, for example. According to this structure, when viewed in the axial direction s, the dimension of the second connecting conductor portion 224 along the circumferential direction t is larger than the dimension of the second connecting conductor portion 223 along the circumferential direction t.

[0070] In the plurality of second winding portions 22, two adjacent second winding portions 22 in the circumferential direction t are directly connected to each other, and the induced current flowing in the secondary winding 2 flows sequentially through the plurality of second winding portions 22. At this time, the second connecting conductor portion 224 of each second winding portion 22 transmits the induced current from the second lower conductor portion 222 of the second winding portion 22 adjacent to one side in the circumferential direction t. Furthermore, this induced current flows from the second connecting conductor portion 224 through the second upper conductor portion 221 and the second connecting conductor portion 223 to the second lower conductor portion 222. That is, in Figure 13 In the example shown, the induced current flowing in each of the second surrounding portions 22 flows counterclockwise. Therefore, the direction of the induced current flowing in each of the first surrounding portions 21 and the direction of the induced current flowing in each of the second surrounding portions 22 are the same when viewed along the circumferential direction t. In this way, the induced current of the secondary winding 2 rotates once in each of the multiple second surrounding portions 22. Furthermore, the direction of the induced current flowing in the second surrounding portions 22 can also be reversed compared to the example above. That is, the second lower conductor portion 222 of each second surrounding portion 22 receives the induced current from the second connecting conductor portion 224 of the second surrounding portion 22 adjacent on the other side of the circumferential direction t. And this induced current flows from the second lower conductor portion 222 through the second connecting conductor portion 223 and the second upper conductor portion 221 to the second connecting conductor portion 224. That is, in Figure 13 In the example shown, the induced current flowing in each of the second surrounding portions 22 can also be arranged in a clockwise direction. However, the direction of the induced current flowing in each of the first surrounding portions 21 and the direction of the induced current flowing in each of the second surrounding portions 22 are made to be the same when viewed along the circumferential direction t.

[0071] The connecting portion 23 connects one of the plurality of first surrounding portions 21 to one of the plurality of second surrounding portions 22. For example, the connecting portion 23 is as follows: Figure 14 It is shown to connect to one of the first upper conductor portions 211 among the plurality of first surrounding portions 21 and one of the second lower conductor portions 222 among the plurality of second surrounding portions 22, and to make them conductive.

[0072] In the secondary winding 2, multiple first winding portions 21 are continuously connected along the circumferential direction t, and multiple second winding portions 22 are continuously connected along the circumferential direction t. Furthermore, they are connected via a connecting portion 23. Thus, the induced current in the secondary winding 2 is input to the multiple second winding portions 22 via the connecting portion 23 after the multiple first winding portions 21 have completed one revolution, and then after the multiple second winding portions 22 have completed one revolution.

[0073] In coil component A1, multiple first winding portions 11 (primary winding 1) and multiple first winding portions 21 (secondary winding 2) are arranged alternately in the circumferential direction t, forming a first cylindrical portion 5A. Furthermore, multiple second winding portions 12 (primary winding 1) and multiple second winding portions 22 (secondary winding 2) are arranged alternately in the circumferential direction t, forming a second cylindrical portion 5B. The second cylindrical portion 5B is located inside the first cylindrical portion 5A.

[0074] In coil component A1, such as Figures 3-7 As shown, each first winding portion 11 of the primary winding 1 and each first winding portion 21 of the secondary winding 2 overlaps with each other when viewed along the circumferential direction t. That is, when viewed along the circumferential direction t, each first upper conductor portion 111 overlaps with each first upper conductor portion 211, each first lower conductor portion 112 overlaps with each first lower conductor portion 212, each first connecting conductor portion 113 overlaps with each first connecting conductor portion 213, and each first connecting conductor portion 114 overlaps with each first connecting conductor portion 214. Furthermore, as... Figures 3-7 As shown, each of the second winding portions 12 of the primary winding 1 and each of the second winding portions 22 of the secondary winding 2 overlap with each other when viewed along the circumferential direction t. That is, when viewed along the circumferential direction t, each of the second upper conductor portions 121 overlaps with each of the second upper conductor portions 221, each of the second lower conductor portions 122 overlaps with each of the second lower conductor portions 222, each of the second connecting conductor portions 123 overlaps with each of the second connecting conductor portions 223, and each of the second connecting conductor portions 124 overlaps with each of the second connecting conductor portions 224.

[0075] In coil component A1, such as Figures 3-7 As shown, each first winding portion 11 of the primary winding 1 and each second winding portion 22 of the secondary winding 2 partially overlap in the axial direction s and in the radial direction u. Specifically, in the axial direction s, each first upper conductor portion 111 overlaps with each second upper conductor portion 221, and each first lower conductor portion 112 overlaps with each second lower conductor portion 222. In the radial direction u, each first connecting conductor portion 113 overlaps with each second connecting conductor portion 223, and each first connecting conductor portion 114 overlaps with each second connecting conductor portion 224. Furthermore, as... Figures 3-7As shown, each second winding portion 12 of the primary winding 1 and each first winding portion 21 of the secondary winding 2 partially overlap in the axial direction s and in the radial direction u. That is, in the axial direction s, each second upper conductor portion 121 overlaps with each first upper conductor portion 211, and each second lower conductor portion 122 overlaps with each first lower conductor portion 212. In the radial direction u, each second connecting conductor portion 123 overlaps with each first connecting conductor portion 213, and each second connecting conductor portion 124 overlaps with each first connecting conductor portion 214.

[0076] Next, regarding the coil-embedded substrate B1 containing the coil component A1, refer to... Figures 15-17 Please provide an explanation. Figure 15 This is a three-dimensional view showing the coil's built-in substrate B1. Figure 16 This is a top view showing the coil's built-in substrate B1. Figure 17 It is along Figure 16 A cross-sectional view of the XVII-XVII line.

[0077] The coil-embedded substrate B1 is, for example, a printed circuit board. The coil-embedded substrate B1 is not limited to a printed circuit board; it can also be a semiconductor substrate or a ceramic substrate. The coil-embedded substrate B1 houses the coil component A1. The coil-embedded substrate B1 is, for example, rectangular in shape when viewed from above. The coil-embedded substrate B1 has multiple wiring layers 7, multiple through electrodes 79, insulating components 8, and multiple terminals 9A and 9B.

[0078] The multiple wiring layers 7 are each made of metal, for example. The material constituting each wiring layer 7 is, for example, Cu (copper) or a Cu alloy. The material is not limited to Cu or Cu alloy. The multiple wiring layers 7 include a first wiring layer 71, a second wiring layer 72, a third wiring layer 73, and a fourth wiring layer 74.

[0079] The first wiring layer 71, the second wiring layer 72, the third wiring layer 73, and the fourth wiring layer 74 are from one side of the axial direction s ( Figure 17 (above) to the other side ( Figure 17 The layers (below) are stacked and spaced apart from each other. Wiring patterns are formed on the first wiring layer 71, the second wiring layer 72, the third wiring layer 73 and the fourth wiring layer 74 respectively.

[0080] The wiring pattern in the first wiring layer 71 constitutes a plurality of first upper conductor portions 111 (first winding portion 11 of primary winding 1) and a plurality of first upper conductor portions 211 (first winding portion 21 of secondary winding 2).

[0081] The wiring pattern in the second wiring layer 72 constitutes a plurality of second upper conductor portions 121 (second winding portion 12 of primary winding 1) and a plurality of second upper conductor portions 221 (second winding portion 22 of secondary winding 2).

[0082] The wiring pattern in the third wiring layer 73 constitutes a plurality of second lower conductor portions 122 (second winding portion 12 of primary winding 1) and a plurality of second lower conductor portions 222 (second winding portion 22 of secondary winding 2).

[0083] The wiring pattern in the fourth wiring layer 74 constitutes a plurality of first lower conductor portions 112 (first winding portion 11 of primary winding 1) and a plurality of first lower conductor portions 212 (first winding portion 21 of secondary winding 2).

[0084] like Figure 17 As shown, the axial spacing between the first wiring layer 71 and the second wiring layer 72 is approximately the same as the axial spacing between the third wiring layer 73 and the fourth wiring layer 74. Furthermore, the axial spacing between the second wiring layer 72 and the third wiring layer 73 is larger than the axial spacing between the first wiring layer 71 and the second wiring layer 72, and the axial spacing between the third wiring layer 73 and the fourth wiring layer 74, respectively. Therefore, in the primary winding 1 of the coil component A1, the axial spacing between the first upper conductor portion 111 and the second upper conductor portion 121 is approximately the same as the axial spacing between the second lower conductor portion 122 and the first lower conductor portion 112. Furthermore, the axial spacing between the second upper conductor portion 121 and the second lower conductor portion 122 is greater than the axial spacing between the first upper conductor portion 111 and the second upper conductor portion 121, and the axial spacing between the second lower conductor portion 122 and the first lower conductor portion 112, respectively. The same applies to the secondary winding 2 of the coil component A1.

[0085] Multiple through electrodes 79 partially penetrate the insulating member 8 along the axial direction s. In this embodiment, each through electrode 79 is, for example, columnar. The multiple through electrodes 79 include electrodes that connect the first wiring layer 71 to the fourth wiring layer 74, and electrodes that connect the second wiring layer 72 to the third wiring layer 73. The through electrodes 79 that connect the first wiring layer 71 to the fourth wiring layer 74 form a pair of first connecting conductor portions 113, 114 (the first surrounding portion 11 of the primary winding 1) and a pair of first connecting conductor portions 213, 214 (the first surrounding portion 21 of the secondary winding 2). Furthermore, the through electrodes 79 that connect the second wiring layer 72 to the third wiring layer 73 form a pair of second connecting conductor portions 123, 124 (the second surrounding portion 12 of the primary winding 1) and a pair of second connecting conductor portions 223, 224 (the second surrounding portion 22 of the secondary winding 2).

[0086] In the coil-embedded substrate B1, the coil component A1 is composed of the wiring patterns of multiple wiring layers 7 (first wiring layer 71, second wiring layer 72, third wiring layer 73, and fourth wiring layer 74) and multiple through electrodes 79.

[0087] Insulating components 8, etc. Figures 15-17 The coil component A1 is shown. The insulating component 8 is made of an insulating resin such as glass epoxy resin. The material of the insulating component 8 is not limited to an insulating resin; a semiconductor material (e.g., Si (silicon)) or ceramic that has undergone insulation treatment can be used. Examples of the insulation treatment include doping with insulating impurities or forming an insulating oxide film.

[0088] Insulating components 8, etc. Figure 17 The diagram shows multiple insulating layers 81. (As shown...) Figure 17 As shown, the plurality of insulating layers 81 include: a portion existing in the axial direction s between the first wiring layer 71 and the second wiring layer 72; a portion existing in the axial direction s between the second wiring layer 72 and the third wiring layer 73; and a portion existing in the axial direction s between the third wiring layer 73 and the fourth wiring layer 74. Additionally, the plurality of insulating layers 81 include: a portion formed above the first wiring layer 71 (on one side of the axial direction s) and a portion formed below the fourth wiring layer 74 (on the other side of the axial direction s).

[0089] A pair of terminals 9A are input terminals that are connected to the primary winding 1 and supply current to the primary winding 1. Each pair of terminals 9A includes a portion formed on the outside of the insulating member 8 and a terminal wiring portion 90A connected to this portion and the primary winding 1. The terminal wiring portion 90A of one terminal 9A, for example, is... Figure 14 The envisioned wire is connected to the first upper conductor portion 111 (the first winding portion 11 of the primary winding 1). The other terminal 9A has a terminal wiring portion 90A, for example, as shown... Figure 14 The proposed line is connected to the second lower conductor portion 122 (the second winding portion 12 of the primary winding 1). When a voltage is applied between a pair of terminals 9A, the input current flows from one terminal 9A through the primary winding 1 to the other terminal 9A. As a result, a magnetic field is generated from the primary winding 1.

[0090] A pair of terminals 9B are connected to the secondary winding 2 and are output terminals for the induced current of the secondary winding 2. Each pair of terminals 9B includes a portion formed on the outside of the insulating member 8 and a terminal wiring portion 90B connected to this portion and the secondary winding 2. The terminal wiring portion 90B of one terminal 9B, for example, is... Figure 14 The envisioned wire is connected to the first lower conductor portion 212 (the first winding portion 21 of the secondary winding 2). The other terminal 9B has a terminal wiring portion 90B, for example, as shown... Figure 14The second upper conductor 221 (the second winding 22 of the secondary winding 2) is connected as shown by the envisioned line. The magnetic field generated by the primary winding 1 induces a current in the secondary winding 2, creating a potential difference between a pair of terminals 9B.

[0091] exist Figure 15 and Figure 16 In the example shown, both terminals 9A and 9B are formed to be exposed from the top (the side facing the axial direction s) of the insulating member 8, but this is not a limitation. Depending on the specifications of the coil-embedded substrate B1, the terminals 9A and 9B can be appropriately modified so that they are exposed from the top of the insulating member 8, or from the bottom (the side facing the axial direction s). In this case, the terminal wiring portion 90A of each terminal 9A and the terminal wiring portion 90B of each terminal 9B can be... Figure 14 The example shown has been modified appropriately.

[0092] The effects of the coil component A1 and the coil-embedded substrate B1 in the first embodiment are described below.

[0093] The coil component A1 has a primary winding 1 through which an input current from the outside flows. The primary winding 1 includes a plurality of first surrounding portions 11 that are annular when viewed from a first direction (circumferential direction t). According to this structure, the input current flowing in each of the first surrounding portions 11, for example, in portions opposite to each other in the axial direction s, is in opposite directions. Therefore, the magnetic flux generated by these portions cancels each other outward from each of the first surrounding portions 11, facing opposite sides. The plurality of first surrounding portions 11 are part of a first cylindrical portion 5A that constitutes the appearance of the coil component A1. Therefore, the magnetic flux of the coil component A1 is reduced outside each of the first surrounding portions 11 (first cylindrical portion 5A), thus suppressing magnetic flux leakage to the outside.

[0094] In coil component A1, the primary winding 1 includes a plurality of first winding portions 11 and a plurality of second winding portions 12. The direction of the input current flowing through each of the plurality of first winding portions 11 and the direction of the input current flowing through each of the plurality of second winding portions 12 are the same in the first direction (circumferential direction t). According to this structure, the magnetic flux generated by the input current flowing through each of the first winding portions 11 and the magnetic flux generated by the input current flowing through each of the second winding portions 12 are in the same direction and reinforce each other inside the plurality of second winding portions 12, i.e., inside the second cylindrical portion 5B. Therefore, the magnetic flux inside the second cylindrical portion 5B of coil component A1 increases, thereby increasing the inductance value.

[0095] In coil component A1, both the primary winding 1 and the secondary winding 2 are hollow and lack a magnetic core. In coil components with a magnetic core, the magnetic core becomes a cause of energy loss when the input current to the primary winding 1 is high-frequency. Therefore, even if the input current to the primary winding 1 is high-frequency, the absence of a magnetic core in coil component A1 suppresses energy loss caused by the magnetic core.

[0096] In coil component A1, a plurality of first winding portions 11 of the primary winding 1 and a plurality of first winding portions 21 of the secondary winding 2 are arranged alternately in the circumferential direction t. Furthermore, a second winding portion 22 of the secondary winding 2 is disposed inside each first winding portion 11 of the primary winding 1, and a second winding portion 12 of the primary winding 1 is disposed inside each first winding portion 21 of the secondary winding 2. With this structure, the coupling between the primary winding 1 and the secondary winding 2 becomes good. Therefore, magnetic flux leakage caused by poor coupling between the primary winding 1 and the secondary winding 2 can be suppressed.

[0097] The coil-embedded substrate B1 has multiple wiring layers 7. These wiring layers 7 include a first wiring layer 71, a second wiring layer 72, a third wiring layer 73, and a fourth wiring layer 74 stacked in the axial direction s. Wiring patterns are formed in each of the first wiring layer 71, the second wiring layer 72, the third wiring layer 73, and the fourth wiring layer 74, and these wiring patterns constitute the coil component A1. Based on this structure, the coil component A1 is formed, for example, using a printed circuit board (or semiconductor substrate or ceramic substrate) manufacturing process. Therefore, the coil-embedded substrate B1 facilitates the manufacture of the coil component A1, which has a complex wiring structure. Furthermore, since the coil component A1 is constituted by wiring patterns in the multiple wiring layers 7 in the coil-embedded substrate B1, a low height of the coil component A1 can be achieved.

[0098] In the first embodiment, an example is shown where each first winding portion 11 of the primary winding 1 and each second winding portion 22 of the secondary winding 2 partially overlap in the axial direction s and in the radial direction u, but this is not a limitation. For example, each first winding portion 11 of the primary winding 1 may partially overlap in the axial direction s and in the radial direction u with respect to each second winding portion 12 of the primary winding 1, rather than with respect to each second winding portion 22 of the secondary winding 2. In this case, each first winding portion 21 and each second winding portion 22 of the secondary winding 2 partially overlap in the axial direction s and in the radial direction u. However, compared to the coil component in this modified example, the coupling coefficient between the primary winding 1 and the secondary winding 2 of the coil component A1 is increased, and therefore preferred.

[0099] In the first embodiment, an example is shown where a plurality of first winding portions 11 and a plurality of second winding portions 12, continuously connected along the circumferential direction t, are connected by a connecting portion 13, but this is not a limitation. For example, adjacent first winding portions 11 and second winding portions 12 in the circumferential direction t may also be connected. That is, in the primary winding 1, the input current may flow alternately in each first winding portion 11 and each second winding portion 12. Similarly, in the secondary winding 2, the induced current flows alternately in each first winding portion 21 and each second winding portion 22.

[0100] The first embodiment illustrates an example in which, in each of the first surrounding portions 11 (primary winding 1), the first upper conductor portion 111 is inclined in one direction relative to the radial u towards the circumferential t, and the first lower conductor portion 112 is inclined in the other direction relative to the radial u towards the circumferential t, but this is not a limitation. In each of the first surrounding portions 11, the first upper conductor portion 111 may not be inclined in the circumferential t direction. In this case, since the pair of first connecting conductor portions 113, 114 are shaped along the axial direction s, the inclination angle of the first lower conductor portion 112 relative to the radial u towards the circumferential t becomes larger. Conversely, the first lower conductor portion 112 may not be inclined in the other direction towards the circumferential t direction. In this case, since the pair of first connecting conductor portions 113, 114 are shaped along the axial direction s, the inclination angle of the first upper conductor portion 111 relative to the radial u towards the circumferential t becomes larger. Alternatively, both the first upper conductor portion 111 and the first lower conductor portion 112 may not be inclined in the circumferential t direction. In this case, the pair of first connecting conductor portions 113, 114 are inclined relative to the axial direction s. Such a variation is also found in the second upper conductor portion 121 and the second lower conductor portion 122 in each of the second winding portions 12 (primary winding 1), the first upper conductor portion 211 and the first lower conductor portion 212 in each of the first winding portions 21 (secondary winding 2), and the second upper conductor portion 221 and the second lower conductor portion 222 in each of the second winding portions 22 (secondary winding 2).

[0101] In the first embodiment, an example is illustrated where, in each of the first winding portions 11 (primary winding 1), the dimension of the first connecting conductor portion 114 along the circumferential direction t, viewed in the axial direction s, is larger than the dimension of the first connecting conductor portion 113 along the circumferential direction t, but this is not a limitation. Their dimensions may also be approximately the same. In this case, the predetermined intervals provided between two adjacent first upper conductor portions 111 in the circumferential direction t and between two adjacent first lower conductor portions 112 in the circumferential direction t are relatively larger in the radial direction u near the outer perimeter 52A and relatively smaller near the inner perimeter 51A. Such variations are also found in a pair of second connecting conductor portions 123, 124 in each of the second winding portions 12 (primary winding 1), a pair of first connecting conductor portions 213, 214 in each of the first winding portions 21 (secondary winding 2), and a pair of second connecting conductor portions 223, 224 in each of the second winding portions 22 (secondary winding 2).

[0102] Regarding the coil component A2 of the second embodiment, refer to Figures 18-24 The following explanation is provided. Coil component A2 is, for example, an inductor with coil 3. Coil component A2 may also have a magnetic core, but it is preferably a hollow core without a magnetic core. Like coil component A1, coil component A2 is, for example, ring-shaped. The overall shape of coil component A2, like that of coil component A1, is composed of various combinations of the aforementioned planar shape and cross-sectional shape. In the second embodiment, the case where the planar shape is ring-shaped and the cross-sectional shape is a rectangular ring will be used as an example. For ease of explanation, when coil component A2 is viewed from above, the direction extending from the central axis is designated as the axial direction s, the direction around the central axis as the circumferential direction t, and the direction extending radially from the central axis as the radial direction u. The axial direction s corresponds to the thickness direction of coil component A2. The circumferential direction t coincides with the ring direction of coil component A2. Furthermore, the aforementioned cross-sectional shape corresponds to a cross-section on a plane defined by the axial direction s and the radial direction u.

[0103] Figure 18 This is a three-dimensional view of coil component A2. Figure 19 It is Figure 18 A magnified portion of the image. Figure 20 This is a top view showing coil component A2. Figure 21 It is along Figure 20 End face view of the cut section of the XXI-XXI line. Figure 22 This is a bottom view showing coil component A2. Figure 23 Is Figure 18 The three-dimensional diagram shown in the figure has a portion (part of the first cylindrical portion 5A described later) omitted. Figure 23 In the text, the connecting part 33 (described later) is omitted. Figure 24 This is a schematic diagram of coil 3 viewed along the circumferential direction t.

[0104] In coil component A2, coil 3 is double-wound. Coil component A2 includes a first cylindrical portion 5A and a second cylindrical portion 5B due to the double winding of coil 3. The first cylindrical portion 5A and the second cylindrical portion 5B are, similarly to those in the first embodiment, annular in shape. Figure 23 As shown, the second cylindrical portion 5B is located inside the first cylindrical portion 5A. The first cylindrical portion 5A forms the appearance of the coil component A1. The planar shape of both the first cylindrical portion 5A and the second cylindrical portion 5B is, for example, annular, and their central axes are common. That is, the top-view central axis of the first cylindrical portion 5A is approximately the same as the top-view central axis of the second cylindrical portion 5B. The extending direction of this central axis corresponds to the axial direction s. In addition, the cross-sectional shape of both the first cylindrical portion 5A and the second cylindrical portion 5B is, for example, a rectangular annular shape.

[0105] Coil 3 generates a magnetic field using an externally input current. Coil 3 is constructed similarly to the primary winding 1 in the first embodiment. Coil 3 is as follows... Figures 18-24 As shown, it includes multiple first surrounding portions 31, multiple second surrounding portions 32, and connecting portions 33.

[0106] Multiple first surrounding portions 31 respectively as follows Figure 24 As shown, the shape when viewed along the circumferential direction t is, for example, a rectangular ring. Multiple first surrounding portions 31 are as follows... Figures 18-20 , Figure 22 and Figure 23 As shown, they are arranged in the circumferential direction t when viewed along the axial direction s. The plurality of first surrounding portions 31 are respectively as shown... Figure 24 As shown, it includes a first upper conductor portion 311, a first lower conductor portion 312, and a pair of first connecting conductor portions 313 and 314.

[0107] In each of the first surrounding portions 31, the first upper conductor portion 311 and the first lower conductor portion 312 are as follows: Figure 24 As shown, they are spaced apart along the axial direction s. The first upper conductor portion 311 and the first lower conductor portion 312 are respectively as shown... Figure 20 and Figure 22 As shown, viewed along the axial direction s, it extends from the inner periphery 51A of the first cylindrical portion 5A to the outer periphery 52A of the first cylindrical portion 5A. The first upper conductor portion 311 and the first lower conductor portion 312 are respectively strip-shaped when viewed along the axial direction s. A pair of first connecting conductor portions 313 and 314 are respectively as shown in the figure. Figure 24As shown, the first upper conductor portion 311 extends along the axial direction s. The first connecting conductor portion 313 is connected to the first lower conductor portion 312 of the same first surrounding portion 31. The first connecting conductor portion 314 is connected to the first lower conductor portion 312 of the adjacent first surrounding portion 31 in the circumferential direction t. The pair of first connecting conductor portions 313 and 314 are approximately orthogonal to the first upper conductor portion 311 and the first lower conductor portion 312, respectively. The first connecting conductor portion 313 overlaps with the inner periphery 51A of the first cylindrical portion 5A when viewed in the axial direction s, and the first connecting conductor portion 314 overlaps with the outer periphery 52A of the first cylindrical portion 5A when viewed in the axial direction s. When viewed in the radial direction u, the pair of first connecting conductor portions 313 and 314 are strips extending in the axial direction s.

[0108] In this embodiment, each of the first upper conductor portions 311 is inclined relative to the radial direction u towards the circumferential direction t, and each of the first lower conductor portions 312 is inclined relative to the radial direction u towards the circumferential direction t. Figure 20 In the example shown, the radial direction u overlapping each of the first connecting conductor portions 313 is designated as radial u3, and the first upper conductor portion 311 connected to the first connecting conductor portion 313 is inclined clockwise relative to radial u3 in the circumferential direction t. Furthermore, the first lower conductor portion 312 connected to the first connecting conductor portion 313 is inclined counterclockwise relative to radial u3 in the circumferential direction t. In this way, the first upper conductor portion 311 and the first lower conductor portion 312 are inclined to opposite sides relative to radial u in the circumferential direction t, thereby enabling a pair of first connecting conductor portions 313 and 314 to be formed along the axial direction s.

[0109] Furthermore, in this embodiment, the two adjacent first upper conductor portions 311 in the circumferential direction t and the two adjacent first lower conductor portions 312 in the circumferential direction t are respectively arranged at a predetermined interval. This interval is, for example, approximately the same on the inner perimeter 51A side and the outer perimeter 52A side. With this structure, when viewed in the axial direction s, the dimension of the first connecting conductor portion 314 along the circumferential direction t is larger than the dimension of the first connecting conductor portion 313 along the circumferential direction t.

[0110] In the plurality of first winding portions 31, two adjacent first winding portions 31 in the circumferential direction t are directly connected to each other, and the input current flowing in the coil 3 flows sequentially through the plurality of first winding portions 31. At this time, the first connecting conductor portion 314 of each first winding portion 31 transmits the input current from the first lower conductor portion 312 of the first winding portion 31 adjacent to one side in the circumferential direction t. Furthermore, this input current flows from the first connecting conductor portion 314 through the first upper conductor portion 311 and the first connecting conductor portion 313 to the first lower conductor portion 312. That is, in Figure 24In the example shown, the input current flowing in each of the first winding portions 31 flows counterclockwise. It is then transmitted to the adjacent first winding portion 11 on the other side of the circumferential direction t. In this way, the input current of the coil 3 completes one revolution in each of the multiple first winding portions 31. Furthermore, the direction of the input current flowing in the first winding portions 31 can also be reversed compared to the example above. That is, the first lower conductor portion 312 of each of the first winding portions 31 receives the input current from the first connecting conductor portion 314 of the adjacent first winding portion 31 on the other side of the circumferential direction t. This input current flows from the first lower conductor portion 312 via the first connecting conductor portion 313 and the first upper conductor portion 311 to the first connecting conductor portion 314. That is, in Figure 24 In the example shown, the input current flowing in each of the first surrounding portions 31 can also be arranged in a clockwise direction.

[0111] Multiple second surrounding portions 32 respectively as follows Figure 24 As shown, the shape when viewed along the circumferential direction t is, for example, a rectangular ring. Each of the second surrounding portions 32 is as follows: Figure 24 As shown, when viewed along the circumferential direction t, it is located inside each of the first surrounding portions 31. The plurality of second surrounding portions 32 are as follows... Figure 20 and Figure 22 As shown, when viewed along the axial direction s, they are arranged along the circumferential direction t. The plurality of first surrounding portions 31 and the plurality of second surrounding portions 32 are as follows... Figure 20 and Figure 22 As shown, when viewed along the axial direction s, they are alternately arranged along the circumferential direction t. Figure 24 As shown, the plurality of second surrounding portions 32 respectively include a second upper conductor portion 321, a second lower conductor portion 322 and a pair of second connecting conductor portions 323 and 324.

[0112] In each of the second surrounding portions 32, such as Figure 24 As shown, the second upper conductor portion 321 and the second lower conductor portion 322 are spaced apart in the axial direction s. Figure 20 and Figure 22 As shown, the second upper conductor portion 321 and the second lower conductor portion 322, when viewed along the axial direction s, extend from the inner periphery 51B of the second cylindrical portion 5B to the outer periphery 52B of the second cylindrical portion 5B. The second upper conductor portion 321 and the second lower conductor portion 322 are strip-shaped when viewed along the axial direction s. Figure 24As shown, a pair of second connecting conductor portions 323 and 324 extend from the second upper conductor portion 321 along the axial direction s. The second connecting conductor portion 323 is connected to the second lower conductor portion 322 of the same second surrounding portion 32. The second connecting conductor portion 324 is connected to the second lower conductor portion 322 of the adjacent second surrounding portion 32 in the circumferential direction t. The pair of second connecting conductor portions 323 and 324 are approximately orthogonal to the second upper conductor portion 321 and the second lower conductor portion 322, respectively. The second connecting conductor portion 323 overlaps with the inner periphery 51B of the second cylindrical portion 5B when viewed in the axial direction s, and the second connecting conductor portion 324 overlaps with the outer periphery 52B of the second cylindrical portion 5B when viewed in the axial direction s. The pair of second connecting conductor portions 323 and 324 are strips extending in the axial direction s when viewed in the radial direction u.

[0113] In this embodiment, each of the second upper conductor portions 321 is inclined relative to the radial direction u towards the circumferential direction t, and each of the second lower conductor portions 322 is inclined relative to the radial direction u towards the circumferential direction t. Figure 20 In the example shown, the radial direction u overlapping each of the second connecting conductor portions 323 is designated as radial u3, and the second upper conductor portion 321 connected to the second connecting conductor portion 323 is inclined clockwise relative to radial u3 in the circumferential direction t. Furthermore, the second lower conductor portion 322 connected to the second connecting conductor portion 323 is inclined counterclockwise relative to radial u3 in the circumferential direction t. In this way, the second upper conductor portion 321 and the second lower conductor portion 322 are inclined on opposite sides relative to radial u in the circumferential direction t, thereby enabling a pair of second connecting conductor portions 323 and 324 to be formed along the axial direction s.

[0114] Furthermore, in this embodiment, the two adjacent second upper conductor portions 321 in the circumferential direction t and the two adjacent second lower conductor portions 322 in the circumferential direction t are respectively arranged at a predetermined interval. This interval is approximately the same on the inner perimeter 51B side and the outer perimeter 52B side, for example. According to this structure, when viewed in the axial direction s, the dimension of the second connecting conductor portion 324 along the circumferential direction t is larger than the dimension of the second connecting conductor portion 323 along the circumferential direction t.

[0115] In the plurality of second winding portions 32, two adjacent second winding portions 32 in the circumferential direction t are directly connected to each other, and the input current flowing in the coil 3 flows sequentially through the plurality of second winding portions 32. At this time, the second connecting conductor portion 324 of each second winding portion 32 transmits the input current from the second lower conductor portion 322 of the second winding portion 32 adjacent to one side in the circumferential direction t. Furthermore, this input current flows from the second connecting conductor portion 324 through the second upper conductor portion 321 and the second connecting conductor portion 323 to the second lower conductor portion 322. That is, in Figure 24In the example shown, the input current flowing in each of the second surrounding portions 32 can also flow counterclockwise. Thus, the direction of the input current flowing in each of the first surrounding portions 31 and the direction of the input current flowing in each of the second surrounding portions 32 are the same when viewed along the circumferential direction t. In this way, the input current to the coil 3 completes one revolution in each of the multiple second surrounding portions 32. Furthermore, the direction of the input current flowing in the second surrounding portions 32 can also be the opposite of the example described above. That is, the second lower conductor portion 322 of each of the second surrounding portions 32 receives the input current from the second connecting conductor portion 324 of the second surrounding portion 32 adjacent on the other side of the circumferential direction t. And this input current flows from the second lower conductor portion 322 through the second connecting conductor portion 323 and the second upper conductor portion 321 to the second connecting conductor portion 324. That is, in Figure 24 In the example shown, the input current flowing in each of the second surrounding portions 32 can also be arranged in a clockwise direction. However, the direction of the input current flowing in each of the first surrounding portions 31 is the same as the direction of the input current flowing in each of the second surrounding portions 32 when viewed along the circumferential direction t.

[0116] Connecting part 33 Figure 19 As shown, one of the plurality of first surrounding portions 31 and one of the plurality of second surrounding portions 32 are connected. For example, the connecting portion 33 is connected to one of the plurality of first surrounding portions 31, a first lower conductor portion 312, and one of the plurality of second surrounding portions 32, a second upper conductor portion 321, so that they are connected.

[0117] In coil 3, multiple first winding portions 31 are continuously connected along the circumferential direction t, and multiple second winding portions 32 are continuously connected along the circumferential direction t. Furthermore, they are connected via connecting portions 33. Thus, the input current of coil 3 is input to the multiple second winding portions 32 via connecting portions 33 after the multiple first winding portions 31 have completed one revolution, and then after the multiple second winding portions 32 have completed one revolution.

[0118] In coil component A2, a plurality of first winding portions 31 are arranged in the circumferential direction t to form a first cylindrical portion 5A. Additionally, a plurality of second winding portions 32 are arranged in the circumferential direction t to form a second cylindrical portion 5B. The second cylindrical portion 5B is located inside the first cylindrical portion 5A.

[0119] In coil component A2, such as Figures 18-24As shown, each of the first surrounding portions 31 and each of the second surrounding portions 32 partially overlaps when viewed in the axial direction s and also partially overlaps when viewed in the radial direction u. That is, when viewed in the axial direction s, each of the first upper conductor portions 311 and each of the second upper conductor portions 321 overlap each other, and each of the first lower conductor portions 312 and each of the second lower conductor portions 322 overlap each other. When viewed in the radial direction u, each of the first connecting conductor portions 313 and each of the second connecting conductor portions 323 overlap each other, and each of the first connecting conductor portions 314 and each of the second connecting conductor portions 324 overlap each other.

[0120] Next, regarding the coil-embedded substrate B2 containing the coil component A2, refer to... Figures 25-27 Please provide an explanation. Figure 25 This is a three-dimensional view showing the coil's built-in substrate B2. Figure 26 This is a top view showing the coil's built-in substrate B2. Figure 27 It is along Figure 26 Cross-sectional view of line XXVII-XXVII.

[0121] The coil-embedded substrate B2, like the coil-embedded substrate B1, is a printed circuit board. The coil-embedded substrate B2 is not limited to a printed circuit board; it can also be a semiconductor substrate or a ceramic substrate. The coil-embedded substrate B2 houses the coil component A2. The coil-embedded substrate B2 is, for example, rectangular in shape when viewed from above. The coil-embedded substrate B2 includes multiple wiring layers 7, multiple through electrodes 79, insulating components 8, and a pair of terminals 9C.

[0122] In the coil-embedded substrate B2, such as Figure 27 As shown, the multiple wiring layers 7 include a first wiring layer 71, a second wiring layer 72, a third wiring layer 73, and a fourth wiring layer 74, each having a wiring pattern formed thereon.

[0123] like Figure 27 As shown, multiple first upper conductor portions 311 are formed by the wiring pattern in the first wiring layer 71. Multiple second upper conductor portions 321 are formed by the wiring pattern in the second wiring layer 72. Multiple second lower conductor portions 322 are formed by the wiring pattern in the third wiring layer 73. Multiple first lower conductor portions 312 are formed by the wiring pattern in the fourth wiring layer 74.

[0124] like Figure 27As shown, in this embodiment, the axial spacing (s) between the first wiring layer 71 and the second wiring layer 72 is approximately the same as the axial spacing (s) between the third wiring layer 73 and the fourth wiring layer 74. Furthermore, the axial spacing (s) between the second wiring layer 72 and the third wiring layer 73 is larger than both the axial spacing (s) between the first wiring layer 71 and the second wiring layer 72, and the axial spacing (s) between the third wiring layer 73 and the fourth wiring layer 74. Therefore, in the coil 3 of the coil component A2, the axial spacing (s) between the first upper conductor portion 311 and the second upper conductor portion 321 is approximately the same as the axial spacing (s) between the second lower conductor portion 322 and the first lower conductor portion 312. Furthermore, the axial spacing between the second upper conductor portion 321 and the second lower conductor portion 322 is greater than the axial spacing between the first upper conductor portion 311 and the second upper conductor portion 321, and the axial spacing between the second lower conductor portion 322 and the first lower conductor portion 312.

[0125] Furthermore, a pair of first connecting conductor portions 313 and 314 (first surrounding portions 31) are formed by through electrodes 79 that connect the first wiring layer 71 and the fourth wiring layer 74. Additionally, a pair of second connecting conductor portions 323 and 324 (second surrounding portions 32) are formed by through electrodes 79 that connect the second wiring layer 72 and the third wiring layer 73.

[0126] In the coil-embedded substrate B2, the coil component A2 is formed by the wiring patterns of multiple wiring layers 7 (first wiring layer 71, second wiring layer 72, third wiring layer 73, and fourth wiring layer 74) and multiple through electrodes 79.

[0127] A pair of terminals 9C are connected to the coil 3 and serve as input terminals for supplying current to the coil 3. Each pair of terminals 9C includes a portion formed on the outside of the insulating member 8 and a terminal wiring portion 90C connected to this portion and the coil 3. Figure 25 As shown, the terminal wiring portion 90C of one terminal 9C is connected, for example, to the first upper conductor portion 311 (first surrounding portion 31). The terminal wiring portion 90C of the other terminal 9C is connected, for example, to the second lower conductor portion 322 (second surrounding portion 32). When a voltage is applied between the pair of terminals 9C, the input current flows from one terminal 9C to the other terminal 9C via the coil 3, thereby generating a magnetic field from the coil 3.

[0128] exist Figure 25In the example shown, a pair of terminals 9C are formed to protrude from the top of the insulating member 8 (the side facing the axial direction s), but this is not a limitation. The pair of terminals 9C may be appropriately modified to protrude from the top of the insulating member 8 or from the bottom of the insulating member 8 (the side facing the axial direction s) depending on the specifications of the coil-embedded substrate B2.

[0129] The effects of the coil component A2 and the coil-embedded substrate B2 in the second embodiment are described below.

[0130] The coil component A2 includes a coil 3 through which an input current from the outside flows. The coil 3 includes a plurality of first surrounding portions 31, each appearing annular when viewed in a first direction (circumferential direction t). According to this structure, the input current flowing in each of the first surrounding portions 31, for example, in portions opposite each other in the axial direction s, is in opposite directions. Therefore, the magnetic fluxes generated by these portions cancel each other outwards from each of the first surrounding portions 31, facing opposite sides. The plurality of first surrounding portions 31 form the first cylindrical portion 5A constituting the appearance of the coil component A2. Therefore, because the magnetic flux is reduced outside each of the first surrounding portions 31 (first cylindrical portion 5A), the coil component A2 is able to suppress magnetic flux leakage to the outside.

[0131] In coil component A2, coil 3 includes multiple first winding portions 31 and multiple second winding portions 32. The direction of the input current flowing through each of the multiple first winding portions 31 and the direction of the input current flowing through each of the multiple second winding portions 32 are the same in the first direction (circumferential direction t). According to this structure, the magnetic flux generated by the input current flowing through each of the first winding portions 31 and the magnetic flux generated by the input current flowing through each of the second winding portions 32 are directed in the same direction and reinforce each other inside the multiple second winding portions 32, i.e., inside the second cylindrical portion 5B. Therefore, coil component A2 can increase its inductance value due to the increased magnetic flux inside the second cylindrical portion 5B.

[0132] Coil component A1, unlike coil 3, does not have a magnetic core and is hollow. In coil components with a magnetic core, when the input current to coil 3 is at a high frequency, the magnetic core becomes a cause of energy loss. Therefore, even if the input current to coil 3 is at a high frequency, coil component A2, lacking a magnetic core, can suppress the energy loss caused by the magnetic core.

[0133] In the coil-embedded substrate B2, wiring patterns are formed on each of the first wiring layer 71, the second wiring layer 72, the third wiring layer 73, and the fourth wiring layer 74, and these wiring patterns constitute the coil component A2. Based on this structure, the coil component A2 can be formed, for example, using a printed circuit board (or semiconductor substrate or ceramic substrate) manufacturing process. Therefore, the coil-embedded substrate B2 facilitates the manufacture of the coil component A2, which has a complex wiring structure. Furthermore, since the coil component A2 is composed of wiring patterns from multiple wiring layers 7, the coil component A2 can be made relatively low in height.

[0134] The second embodiment shows an example where each of the first surrounding portions 31 and each of the second surrounding portions 32 overlaps when viewed in the axial direction s, but it is not limited to this. For example, each of the first surrounding portions 31 and each of the second surrounding portions 32 may partially overlap or not overlap when viewed in the axial direction s. However, compared with the coil component of this modified example, the coil component A2 increases the inductance value, and is therefore preferred.

[0135] In the second embodiment, each of the first surrounding portions 31 shows an example where the first upper conductor portion 311 is inclined in the circumferential direction t relative to the radial direction u, and the first lower conductor portion 312 is inclined in the circumferential direction t relative to the radial direction u, but this is not a limitation. In each of the first surrounding portions 31, the first upper conductor portion 311 may not be inclined in the circumferential direction t. In this case, the pair of first connecting conductor portions 313, 314 are formed in a shape along the axial direction s, thus the inclination angle of the first lower conductor portion 312 in the circumferential direction t relative to the radial direction u becomes larger. Conversely, the first lower conductor portion 312 may not be inclined in the circumferential direction t. In this case, the pair of first connecting conductor portions 313, 314 are formed in a shape along the axial direction s, thus the inclination angle of the first upper conductor portion 311 in the circumferential direction t relative to the radial direction u becomes larger. Alternatively, neither the first upper conductor portion 311 nor the first lower conductor portion 312 may be inclined in the circumferential direction t. In this case, the pair of first connecting conductor portions 313, 314 are inclined relative to the axial direction s. Such a variation is also found in the second upper conductor portion 321 and the second lower conductor portion 322 in each of the second surrounding portions 32.

[0136] In the second embodiment, an example is illustrated where, viewed in the axial direction s, the dimension of the first connecting conductor portion 314 along the circumferential direction t is larger than that of the first connecting conductor portion 313 along the circumferential direction t in each of the first surrounding portions 31, but this is not a limitation. Their dimensions may also be approximately the same. In this case, the predetermined intervals provided between two adjacent first upper conductor portions 311 in the circumferential direction t and between two adjacent first lower conductor portions 312 in the circumferential direction t are relatively larger in the radial direction u near the outer perimeter 52A and relatively smaller near the inner perimeter 51A. Such a variation is also present in a pair of second connecting conductor portions 323, 324 in each of the second surrounding portions 32.

[0137] The first and second embodiments illustrate examples where the plurality of through electrodes 79 in each coil-embedded substrate B1, B2 are respectively configured as columnar, but are not limited thereto. For example, each through electrode 79 may also be configured as a so-called through hole. This through hole is, for example, circular in shape when viewed from above. Alternatively, a plurality of through holes may be provided relative to each through electrode 79.

[0138] The first and second embodiments illustrate examples where each coil component A1 and A2 has a ring-shaped appearance, but are not limited to this. For example, each coil component A1 may also be solenoid-shaped. In this disclosure, "soleoid shape" refers to a shape whose planar shape is not ring-shaped, including not only straight windings but also curved windings. In this modified example, the plurality of first winding portions 11 and the plurality of second winding portions 12 of the primary winding 1, the plurality of first winding portions 21 and the plurality of second winding portions 22 of the secondary winding 2, or the plurality of first winding portions 31 and the second winding portions 32 of the coil 3 are arranged in a straight or curved manner. However, in the case of a solenoid shape, since the planar shape is not ring-shaped, the structure formed by the ring shape of each coil component A1 and A2 is effective in suppressing magnetic flux leakage.

[0139] The first and second embodiments illustrate examples where each coil component A1, A2 is formed by a wiring pattern in a plurality of wiring layers 7 of the coil-embedded substrate B1, but are not limited thereto. For example, wires or plates may be wound to form a primary winding 1 and a secondary winding 2 (or a coil 3).

[0140] The coil components and coil-embedded substrate disclosed herein are not limited to the embodiments described above. The specific structures of each part of the coil components and coil-embedded substrate disclosed herein can be freely modified in various ways. This disclosure includes embodiments described in the following appendix.

[0141] Postscript 1.

[0142] A coil component comprising:

[0143] A primary winding that generates a magnetic field using an externally input current; and

[0144] The secondary winding through which the induced current generated by the magnetic field flows.

[0145] The primary winding includes multiple primary-side first winding portions and multiple primary-side second winding portions, which are annular when viewed in the first direction.

[0146] The secondary winding includes multiple second-side first winding portions and multiple second-side winding portions that are annular when viewed in the first direction.

[0147] The plurality of primary-side first surrounding portions and the plurality of secondary-side first surrounding portions are arranged alternately in the first direction to form a first cylindrical portion.

[0148] The plurality of primary-side second surrounding portions and the plurality of secondary-side second surrounding portions are arranged alternately in the first direction to form a second cylindrical portion.

[0149] The second cylindrical portion is located inside the first cylindrical portion when viewed in the first direction.

[0150] The direction of the input current flowing in each of the plurality of primary side first surrounding portions is the same as the direction of the input current flowing in each of the plurality of primary side second surrounding portions.

[0151] Postscript 2.

[0152] The coil component described in Appendix 1,

[0153] Each of the plurality of primary-side first surrounding portions includes a primary-side first upper conductor portion and a primary-side first lower conductor portion spaced apart in a thickness direction orthogonal to the first direction.

[0154] Each of the plurality of primary-side second surrounding portions includes a primary-side second upper conductor portion and a primary-side second lower conductor portion spaced apart in the thickness direction.

[0155] Each of the plurality of secondary-side first surrounding portions includes a secondary-side first upper conductor portion and a secondary-side first lower conductor portion spaced apart in the thickness direction.

[0156] Each of the plurality of secondary-side second surrounding portions includes a secondary-side second upper conductor portion and a secondary-side second lower conductor portion spaced apart in the thickness direction.

[0157] Postscript 3.

[0158] The coil component described in Appendix 2,

[0159] The primary side first upper conductor portion and the secondary side first upper conductor portion overlap when viewed in the first direction.

[0160] The first lower conductor portion on the primary side and the first lower conductor portion on the secondary side overlap when viewed in the first direction.

[0161] Appendix 4.

[0162] The coil component described in Appendix 3,

[0163] The primary side second upper conductor portion and the secondary side second upper conductor portion overlap when viewed in the first direction.

[0164] The second lower conductor portion on the primary side overlaps with the second lower conductor portion on the secondary side when viewed in the first direction.

[0165] Postscript 5.

[0166] The coil component described in Appendix 4,

[0167] In the thickness direction, the distance between the second upper conductor portion and the second lower conductor portion of the primary side is greater than the distance between the first upper conductor portion and the second upper conductor portion of the primary side, and the distance between the second lower conductor portion of the primary side and the first lower conductor portion of the primary side.

[0168] Postscript 6.

[0169] The coil component as described in any one of Appendices 3 to 5,

[0170] The primary side first upper conductor portion and the secondary side second upper conductor portion overlap in the thickness direction.

[0171] The first lower conductor portion on the primary side and the second lower conductor portion on the secondary side overlap in the thickness direction.

[0172] Postscript 7.

[0173] The coil component described in Appendix 6,

[0174] The second upper conductor portion on the primary side overlaps with the first upper conductor portion on the secondary side when viewed in the thickness direction.

[0175] The second lower conductor portion on the primary side overlaps with the first lower conductor portion on the secondary side when viewed in the thickness direction.

[0176] Postscript 8.

[0177] The coil component as described in any one of Appendices 3 to 7,

[0178] Each of the plurality of primary-side first surrounding portions includes a pair of primary-side first connecting conductor portions extending from the primary-side first upper conductor portion toward the thickness direction.

[0179] One of the pair of primary side first connecting conductor portions is connected to the primary side first lower conductor portion.

[0180] Each of the plurality of primary-side second surrounding portions includes a pair of primary-side second connecting conductor portions extending from the primary-side second upper conductor portion in the thickness direction.

[0181] One of the pair of primary side second connecting conductor portions is connected to the primary side second lower conductor portion.

[0182] Postscript 9.

[0183] The coil component described in Appendix 8,

[0184] The other of the pair of primary side first connecting conductor portions is connected to the primary side first lower conductor portion of the adjacent primary side first surrounding portion.

[0185] The other of the pair of primary side second connecting conductor portions is connected to the primary side second lower conductor portion of the adjacent primary side second surrounding portion.

[0186] Postscript 10.

[0187] The coil component described in Appendix 9,

[0188] The primary winding also includes a primary side connection portion that connects one of the plurality of primary side first winding portions to one of the plurality of primary side second winding portions.

[0189] Postscript 11.

[0190] The coil components described in Appendix 9 or Appendix 10,

[0191] Each of the plurality of secondary-side first surrounding portions includes a pair of secondary-side first connecting conductor portions extending from the secondary-side first upper conductor portion toward the thickness direction.

[0192] One of the pair of secondary-side first connecting conductor portions is connected to the secondary-side first lower conductor portion.

[0193] Each of the plurality of secondary-side second surrounding portions includes a pair of secondary-side second connecting conductor portions extending from the secondary-side upper conductor portion toward the thickness direction.

[0194] One of the pair of secondary side second connecting conductor portions is connected to the secondary side second lower conductor portion.

[0195] Postscript 12.

[0196] The coil component described in Appendix 11,

[0197] The other of the pair of secondary-side first connecting conductor portions is connected to the secondary-side first lower conductor portion of the adjacent secondary-side first surrounding portion.

[0198] The other of the pair of secondary side second connecting conductor portions is connected to the secondary side second lower conductor portion of the adjacent secondary side second surrounding portion.

[0199] Postscript 13.

[0200] The coil component described in Appendix 12,

[0201] The secondary winding further includes a secondary side connection portion that enables one of the plurality of secondary side first winding portions to conduct with one of the plurality of secondary side second winding portions.

[0202] Postscript 14.

[0203] The coil component as described in any one of Appendices 2 to 13,

[0204] The first cylindrical portion and the second cylindrical portion are respectively annular in the thickness direction with the first direction as the circumference.

[0205] Postscript 15.

[0206] The coil component described in Appendix 14,

[0207] The first upper conductor portion, the first lower conductor portion, the first upper conductor portion, and the first lower conductor portion on the secondary side extend from the inner periphery to the outer periphery of the first cylindrical portion when viewed in the thickness direction.

[0208] Postscript 16.

[0209] The coil component described in Appendix 15,

[0210] The primary side first upper conductor portion, the primary side first lower conductor portion, the secondary side first upper conductor portion, and the secondary side first lower conductor portion are all strip-shaped when viewed in the thickness direction.

[0211] Postscript 17.

[0212] The coil components described in Appendix 15 or Appendix 16,

[0213] The primary side first upper conductor portion and the secondary side first upper conductor portion, viewed in the thickness direction, are respectively inclined towards the circumferential direction of the first cylindrical portion relative to the radial direction of the first cylindrical portion.

[0214] The primary side first lower conductor portion and the secondary side first lower conductor portion, when viewed in the thickness direction, are respectively inclined in the opposite direction of the circumference of the first cylindrical portion relative to the radial direction of the first cylindrical portion.

[0215] Postscript 18.

[0216] The coil component as described in any one of Appendix 14 or Appendix 17,

[0217] The primary side second upper conductor portion, the primary side second lower conductor portion, the secondary side second upper conductor portion, and the secondary side second lower conductor portion extend from the inner periphery to the outer periphery of the second cylindrical portion when viewed in the thickness direction.

[0218] Postscript 19.

[0219] The coil component described in Appendix 18,

[0220] The primary side second upper conductor portion, the primary side second lower conductor portion, the secondary side second upper conductor portion, and the secondary side second lower conductor portion are all strip-shaped when viewed in the thickness direction.

[0221] Postscript 20.

[0222] The coil component as described in any one of Appendix 18 or Appendix 19,

[0223] The primary side second upper conductor portion and the secondary side second upper conductor portion, viewed in the thickness direction, are respectively inclined towards the circumferential direction of the second cylindrical portion relative to the radial direction of the second cylindrical portion.

[0224] The primary side second lower conductor portion and the secondary side second lower conductor portion, when viewed in the thickness direction, are respectively inclined in the opposite direction of the circumference of the second cylindrical portion relative to the radial direction of the second cylindrical portion.

[0225] Postscript 21.

[0226] A coil component, wherein,

[0227] This includes coils that use externally input current to generate a magnetic field.

[0228] The coil includes a plurality of first winding portions and a plurality of second winding portions that are ring-shaped when viewed in the first direction.

[0229] The plurality of first circumferential portions are arranged in the first direction to form a first cylindrical portion.

[0230] The plurality of second circumferential portions are arranged in the first direction to form a second cylindrical portion.

[0231] The second cylindrical portion is located inside the first cylindrical portion when viewed in the first direction.

[0232] The first cylindrical portion and the second cylindrical portion are both annular when viewed in the thickness direction orthogonal to the first direction.

[0233] The direction of the input current flowing through each of the plurality of first surrounding portions is the same as the direction of the input current flowing through each of the plurality of second surrounding portions.

[0234] Postscript 22.

[0235] A coil-embedded substrate, which houses the coil component as described in any one of Appendices 2 to 21, comprises:

[0236] Multiple wiring layers stacked in the thickness direction; and

[0237] Multiple insulating layers exist between the plurality of wiring layers in the thickness direction.

[0238] The coil component is composed of wiring patterns in the plurality of wiring layers.

[0239] Postscript 23.

[0240] The coil-embedded substrate described in Appendix 22,

[0241] The coil component is a transformer.

[0242] Explanation of symbols

[0243] A1, A2: Coil component 1: Primary winding

[0244] 11: First surrounding section 111: First upper conductor section

[0245] 112: First lower conductor section; 113, 114: First connecting conductor section

[0246] 12: Second surrounding section; 121: Second upper conductor section

[0247] 122: Second lower conductor section; 123, 124: Second connecting conductor section

[0248] 13: Connecting part 2: Secondary winding

[0249] 21: First surrounding part; 211: First upper conductor part

[0250] 212: First lower conductor portion; 213, 214: First connecting conductor portion

[0251] 22: Second surrounding section; 221: Second upper conductor section

[0252] 222: Second lower conductor section; 223, 224: Second connecting conductor section

[0253] 23: Connecting part 3: Coil

[0254] 31: First surrounding part; 311: First upper conductor part

[0255] 312: First lower conductor portion; 313, 314: First connecting conductor portion

[0256] 32: Second surrounding section; 321: Second upper conductor section

[0257] 322: Second lower conductor section; 323, 324: Second connecting conductor section

[0258] 33: Connecting part 5A: First cylindrical part

[0259] 5B: Second cylindrical portion 51A, 51B: Inner peripheral edge

[0260] 52A, 52B: Outer perimeter B1, B2: Coil internal substrate

[0261] 7: Wiring layer 71: First wiring layer

[0262] 72: Second wiring layer; 73: Third wiring layer

[0263] 74: Fourth wiring layer; 79: Through electrode

[0264] 8: Insulating components 81: Insulating layer

[0265] 9A, 9B, 9C: Terminals; 90A, 90B, 90C: Terminal wiring section

[0266] s: axial direction; t: circumferential direction; u: radial direction.

Claims

1. A coil component, characterized in that, include: A primary winding that uses an externally input current to generate a magnetic field; and The secondary winding through which the induced current generated by the magnetic field flows. The primary winding includes multiple primary-side first winding portions and multiple primary-side second winding portions, which are annular when viewed in the first direction. The secondary winding includes multiple second-side first winding portions and multiple second-side winding portions that are annular when viewed in the first direction. The plurality of primary-side first surrounding portions and the plurality of secondary-side first surrounding portions are arranged alternately in the first direction to form a first cylindrical portion. The plurality of primary-side second surrounding portions and the plurality of secondary-side second surrounding portions are arranged alternately in the first direction to form a second cylindrical portion. The second cylindrical portion is located inside the first cylindrical portion when viewed in the first direction. The direction of the input current flowing through each of the plurality of primary side first surrounding portions is the same as the direction of the input current flowing through each of the plurality of primary side second surrounding portions. The plurality of primary-side first surrounding portions, the plurality of primary-side second surrounding portions, the plurality of secondary-side first surrounding portions, and the plurality of secondary-side second surrounding portions each include a strip-shaped conductor portion extending from the inner circumference to the outer circumference of the first cylindrical portion when viewed in a thickness direction orthogonal to the first direction. At least a portion of the conductor portion, when viewed in the thickness direction, is inclined circumferentially toward the first cylindrical portion relative to the radial direction of the first cylindrical portion.

2. The coil component as described in claim 1, characterized in that: Each of the plurality of primary-side first surrounding portions includes a primary-side first upper conductor portion and a primary-side first lower conductor portion spaced apart in the thickness direction. Each of the plurality of primary-side second surrounding portions includes a primary-side second upper conductor portion and a primary-side second lower conductor portion spaced apart in the thickness direction. Each of the plurality of secondary-side first surrounding portions includes a secondary-side first upper conductor portion and a secondary-side first lower conductor portion spaced apart in the thickness direction. Each of the plurality of secondary-side second surrounding portions includes a secondary-side second upper conductor portion and a secondary-side second lower conductor portion spaced apart in the thickness direction.

3. The coil component as described in claim 2, characterized in that: The primary side first upper conductor portion and the secondary side first upper conductor portion overlap when viewed in the first direction. The first lower conductor portion on the primary side and the first lower conductor portion on the secondary side overlap when viewed in the first direction.

4. The coil component as described in claim 3, characterized in that: The primary side second upper conductor portion and the secondary side second upper conductor portion overlap when viewed in the first direction. The second lower conductor portion on the primary side overlaps with the second lower conductor portion on the secondary side when viewed in the first direction.

5. The coil component as described in claim 4, characterized in that: In the thickness direction, the distance between the second upper conductor portion and the second lower conductor portion of the primary side is greater than the distance between the first upper conductor portion and the second upper conductor portion of the primary side, and the distance between the second lower conductor portion of the primary side and the first lower conductor portion of the primary side.

6. The coil component as described in any one of claims 3 to 5, characterized in that: The primary side first upper conductor portion and the secondary side second upper conductor portion overlap in the thickness direction. The first lower conductor portion on the primary side and the second lower conductor portion on the secondary side overlap in the thickness direction.

7. The coil component as described in claim 6, characterized in that: The second upper conductor portion on the primary side overlaps with the first upper conductor portion on the secondary side when viewed in the thickness direction. The second lower conductor portion on the primary side overlaps with the first lower conductor portion on the secondary side when viewed in the thickness direction.

8. The coil component as described in any one of claims 3 to 5, characterized in that: Each of the plurality of primary-side first surrounding portions includes a pair of primary-side first connecting conductor portions extending from the primary-side first upper conductor portion toward the thickness direction. One of the pair of primary side first connecting conductor portions is connected to the primary side first lower conductor portion. Each of the plurality of primary-side second surrounding portions includes a pair of primary-side second connecting conductor portions extending from the primary-side second upper conductor portion in the thickness direction. One of the pair of primary side second connecting conductor portions is connected to the primary side second lower conductor portion.

9. The coil component as claimed in claim 8, characterized in that: The other of the pair of primary side first connecting conductor portions is connected to the primary side first lower conductor portion of the adjacent primary side first surrounding portion. The other of the pair of primary side second connecting conductor portions is connected to the primary side second lower conductor portion of the adjacent primary side second surrounding portion.

10. The coil component as claimed in claim 9, characterized in that: The primary winding also includes a primary side connection portion that connects one of the plurality of primary side first winding portions to one of the plurality of primary side second winding portions.

11. The coil component as claimed in claim 9 or 10, characterized in that: Each of the plurality of secondary-side first surrounding portions includes a pair of secondary-side first connecting conductor portions extending from the secondary-side first upper conductor portion toward the thickness direction. One of the pair of secondary-side first connecting conductor portions is connected to the secondary-side first lower conductor portion. Each of the plurality of secondary-side second surrounding portions includes a pair of secondary-side second connecting conductor portions extending from the secondary-side upper conductor portion toward the thickness direction. One of the pair of secondary side second connecting conductor portions is connected to the secondary side second lower conductor portion.

12. The coil component as claimed in claim 11, characterized in that: The other of the pair of secondary-side first connecting conductor portions is connected to the secondary-side first lower conductor portion of the adjacent secondary-side first surrounding portion. The other of the pair of secondary side second connecting conductor portions is connected to the secondary side second lower conductor portion of the adjacent secondary side second surrounding portion.

13. The coil component as claimed in claim 12, characterized in that: The secondary winding further includes a secondary side connection portion that enables one of the plurality of secondary side first winding portions to conduct with one of the plurality of secondary side second winding portions.

14. The coil component as described in any one of claims 2 to 5, characterized in that: The first cylindrical portion and the second cylindrical portion are respectively annular in the thickness direction with the first direction as the circumference.

15. The coil component as claimed in claim 14, characterized in that: The first upper conductor portion, the first lower conductor portion, the first upper conductor portion, and the first lower conductor portion on the secondary side extend from the inner periphery to the outer periphery of the first cylindrical portion when viewed in the thickness direction.

16. The coil component as claimed in claim 15, characterized in that: The primary side first upper conductor portion, the primary side first lower conductor portion, the secondary side first upper conductor portion, and the secondary side first lower conductor portion are all strip-shaped when viewed in the thickness direction.

17. The coil component as claimed in claim 15 or 16, characterized in that: The primary side first upper conductor portion and the secondary side first upper conductor portion, viewed in the thickness direction, are respectively inclined towards the circumferential direction of the first cylindrical portion relative to the radial direction of the first cylindrical portion. The primary side first lower conductor portion and the secondary side first lower conductor portion, when viewed in the thickness direction, are respectively inclined in the opposite direction of the circumference of the first cylindrical portion relative to the radial direction of the first cylindrical portion.

18. The coil component as claimed in claim 14, characterized in that: The primary side second upper conductor portion, the primary side second lower conductor portion, the secondary side second upper conductor portion, and the secondary side second lower conductor portion extend from the inner periphery to the outer periphery of the second cylindrical portion when viewed in the thickness direction.

19. The coil component as claimed in claim 18, characterized in that: The primary side second upper conductor portion, the primary side second lower conductor portion, the secondary side second upper conductor portion, and the secondary side second lower conductor portion are all strip-shaped when viewed in the thickness direction.

20. The coil component as claimed in claim 18 or 19, characterized in that: The primary side second upper conductor portion and the secondary side second upper conductor portion, viewed in the thickness direction, are respectively inclined towards the circumferential direction of the second cylindrical portion relative to the radial direction of the second cylindrical portion. The primary side second lower conductor portion and the secondary side second lower conductor portion, when viewed in the thickness direction, are respectively inclined in the opposite direction of the circumference of the second cylindrical portion relative to the radial direction of the second cylindrical portion.

21. A coil-embedded substrate, wherein the coil component according to any one of claims 2 to 20 is embedded therein, characterized in that, include: Multiple wiring layers stacked in the thickness direction; and Multiple insulating layers exist between the plurality of wiring layers in the thickness direction. The coil component is composed of wiring patterns in the plurality of wiring layers.

22. The coil-embedded substrate as described in claim 21, characterized in that: The coil component is a transformer.

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