Laminated inductor and laminated inductor array

Abstract

A laminated inductor according to the present disclosure has: a body; the first external electrode, the second external electrode, the third external electrode and the fourth external electrode are arranged on the bottom surface of the green body; a first coil including a first winding portion formed by connecting end portions of a plurality of first conductors disposed in mutually different layers of the body through through-holes, a first through-hole, and a second through-hole; and a second coil including a second winding portion formed by connecting end portions of a plurality of second conductors disposed in mutually different layers of the body through a through-hole, the first conductor and the second conductor being disposed in the same layer, and a third through-hole, and a fourth through-hole, the second winding portion being formed by connecting end portions of the plurality of second conductors disposed in the same layer. The area of the first conductor in plan view and the area of the second conductor in plan view in the same layer are substantially equal, and the first conductor and the second conductor are arranged alternately when viewed from a direction intersecting the stacking direction.

Description

Technical Field

[0001] The present disclosure relates to stacked inductors and stacked inductor arrays. Background Art

[0002] In recent years, as devices have become more sophisticated, the current of DC-DC converters in voltage conversion circuits has increased and their efficiency has increased, and the rated current of power inductors used in these devices has also increased.

[0003] Patent Document 1, which shows an example of the above-mentioned inductor, discloses a coil component including a first coil conductor provided in a first insulating body and a second coil conductor provided in a second insulating body, wherein a first coil surface of the first coil conductor faces a second coil surface of the second coil conductor.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2019-067883

[0005] As described in Patent Document 1, when the coil component includes a first coil conductor and a second coil conductor, the lead conductor of the first coil conductor (see Patent Document 1) Figure 2 ) and the lead conductor of the second coil conductor (see Patent Document 1 Figure 3 ) in shape and / or in the wiring length of the lead conductor, etc., a difference in direct current resistance (Rdc) and / or inductance value occurs between the first coil conductor and the second coil conductor. Summary of the invention

[0006] The present disclosure has been made in view of this problem. That is, the main purpose of the present disclosure is to reduce the difference in DC resistance and / or inductance value of each coil conductor in an inductor having a plurality of coil conductors therein.

[0007] The laminated inductor disclosed in the present invention comprises: a body formed by laminating a plurality of magnetic layers in a laminating direction; a first external electrode, a second external electrode, a third external electrode and a fourth external electrode arranged on the bottom surface of the body; a first coil comprising a first winding portion, a first through hole and a second through hole, wherein the first winding portion is formed by connecting the ends of a plurality of first conductors arranged on mutually different layers of the body through the through hole, the first through hole connecting one end of the first winding portion relatively close to the bottom surface to the first external electrode, and the second through hole connecting the other end of the first winding portion relatively far from the bottom surface to the second external electrode; and a second coil comprising a second winding portion. The second winding portion is formed by connecting the ends of a plurality of second conductors arranged in different layers of the above-mentioned blank through the through hole, the third through hole connects one end of the above-mentioned second winding portion which is relatively close to the above-mentioned bottom surface with the above-mentioned third external electrode, and the fourth through hole connects the other end of the above-mentioned second winding portion which is relatively far from the above-mentioned bottom surface with the above-mentioned fourth external electrode. The above-mentioned first conductor and the above-mentioned second conductor are arranged in the same layer, and the area of ​​the above-mentioned first conductor in the same layer when viewed from above is approximately equal to the area of ​​the above-mentioned second conductor when viewed from above. When observed from a direction intersecting the above-mentioned stacking direction, the above-mentioned first conductor and the above-mentioned second conductor are alternately arranged.

[0008] In addition, the stacked inductor array disclosed in the present invention comprises: a base body, which is formed by stacking a plurality of magnetic layers in a stacking direction; a first external electrode, a second external electrode, a third external electrode, a fourth external electrode, a fifth external electrode, a sixth external electrode, a seventh external electrode and an eighth external electrode, which are arranged on the bottom surface of the base body; a first coil, which comprises a first winding portion, a first through hole, and a second through hole, wherein the first winding portion is formed by connecting the ends of a plurality of first conductors arranged on different layers of the base body through the through hole, the first through hole connecting an end of the first winding portion relatively close to the bottom surface to the first external electrode, and the second through hole connecting the end of the first winding portion relatively close to the bottom surface to the first external electrode. The other end relatively far away is connected to the above-mentioned second external electrode; the second coil comprises a second winding portion, a third through hole, and a fourth through hole, the second winding portion is formed by connecting the ends of a plurality of second conductors arranged on different layers of the above-mentioned blank through the through hole, the third through hole connects the end of the second winding portion relatively close to the above-mentioned bottom surface to the above-mentioned third external electrode, and the fourth through hole connects the other end of the second winding portion relatively far away from the above-mentioned bottom surface to the above-mentioned fourth external electrode; the third coil comprises a third winding portion, a fifth through hole, and a sixth through hole, the third winding portion is formed by connecting the ends of a plurality of third conductors arranged on different layers of the above-mentioned blank through the through hole, The fifth through hole connects one end of the third winding portion relatively close to the bottom surface and the fifth external electrode, and the sixth through hole connects the other end of the third winding portion relatively far from the bottom surface and the sixth external electrode; and a fourth coil, comprising a fourth winding portion, a seventh through hole, and an eighth through hole, wherein the fourth winding portion is formed by connecting the ends of a plurality of fourth conductors arranged on different layers of the blank by through holes, the seventh through hole connects one end of the fourth winding portion relatively close to the bottom surface and the seventh external electrode, and the eighth through hole connects the other end of the fourth winding portion relatively far from the bottom surface and the eighth external electrode, the third coil and the The fourth coil is adjacent to the first coil and the second coil in a direction intersecting the stacking direction, the first conductor and the second conductor are arranged in the same layer, the area of ​​the first conductor in the same layer when viewed from above is approximately equal to the area of ​​the second conductor in the same layer when viewed from above, and the first conductor and the second conductor are arranged alternately when viewed from the direction intersecting the stacking direction, the third conductor and the fourth conductor are arranged in the same layer, the area of ​​the third conductor in the same layer when viewed from above is approximately equal to the area of ​​the fourth conductor in the same layer when viewed from above, and the third conductor and the fourth conductor are arranged alternately when viewed from the direction intersecting the stacking direction.

[0009] According to the present disclosure, in an inductor having a plurality of coils inside, the difference in DC resistance and / or inductance value of each coil can be reduced. Specifically, the first conductor and the second conductor are arranged in the same layer, and the area of ​​the first conductor in the same layer when viewed from above is approximately equal to the area of ​​the second conductor in the same layer when viewed from above. When viewed from a direction intersecting the stacking direction, the first conductor and the second conductor are alternately arranged, so that the shapes of the coils are similar, and the wiring lengths, etc. can be made approximately equal. Therefore, the difference in DC resistance and / or inductance value of each coil can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a perspective view schematically showing an example of the laminated inductor of the present disclosure.

[0011] Figure 2 It is a perspective view schematically showing an example of the first coil and the second coil of the present disclosure.

[0012] Figure 3 This is an exploded perspective view schematically showing an example of the internal structure of the laminated inductor of the present disclosure.

[0013] Figure 4 It is a cross-sectional view schematically showing an example of the laminated inductor of the present disclosure.

[0014] Figure 5 It is a cross-sectional view schematically showing an example of another laminated inductor according to the present disclosure.

[0015] Figure 6 This is a perspective view schematically showing an example of a laminated inductor array according to the present disclosure.

[0016] Description of Reference Numerals

[0017] 1A…stacked inductor; 1B…stacked inductor array; 10…blank; 11…first principal surface; 12…second principal surface; 13…first end surface; 14…second end surface; 15…first side surface; 16…second side surface; 21-26…first coil to sixth coil; A…avoidance portion; A1…first avoidance portion; A2…second avoidance portion; C1…first conductor; C2…second conductor; E1-E12…first external electrode to twelfth external electrode; T1-T12…first through hole to twelfth through hole; V…through hole; V1…first through hole; V2…second through hole; W1…first winding portion; W2…second winding portion; ML…magnetic layer; IL…insulating layer; R1, R2…region. DETAILED DESCRIPTION

[0018] The following is an explanation of the laminated inductor of the present disclosure. In addition, the present disclosure is not limited to the following structure, and can be appropriately changed within the scope of the present disclosure. In addition, a structure obtained by combining a plurality of the preferred structures described below is also the present disclosure.

[0019] The laminated inductor of the present disclosure is used in, for example, a DC-DC converter. The laminated inductor of the present disclosure can also be used for purposes other than DC-DC converters.

[0020] In this specification, terms indicating the relationship between elements (e.g., "parallel", "orthogonal", etc.) and terms indicating the shape of elements do not only mean strict terms like words, but also mean substantially the same range, such as a range containing a difference of about several percent. In addition, in this specification, the direction in which the magnetic layers and coil conductors constituting the blank are stacked is referred to as the "stacking direction".

[0021] The drawings shown below are schematic diagrams, and their dimensions, aspect ratios, and other aspects may differ from those of actual products.

[0022] <Multilayer Inductors>

[0023] First, refer to Figures 1 to 4 One embodiment of the laminated inductor of the present disclosure will be described. Note that the shapes and arrangements of the laminated inductor and its components are not limited to the examples shown in the drawings.

[0024] Figure 1 The laminated inductor 1A shown includes a base body 10, first external electrodes E1, second external electrodes E2, third external electrodes E3, and fourth external electrodes E4 provided on the bottom surface of the base body 10, and first coils 21 and second coils 22. Each component will be described in detail below.

[0025] -Body-

[0026] The blank 10 is, for example, a rectangular parallelepiped or substantially rectangular parallelepiped having six faces. The blank 10 may also have rounded corners and ridges. The corner is where three faces of the blank 10 intersect, and the ridge is where two faces of the blank 10 intersect.

[0027] exist Figure 1 In the figure, the length direction, width direction, and height direction of the laminated inductor 1A and the green body 10 are represented as L direction, W direction, and T direction, respectively. The length direction L, the width direction W, and the height direction T are orthogonal to each other. The mounting surface of the laminated inductor 1A is, for example, a surface parallel to the length direction L and the width direction W (LW surface).

[0028] Figure 1The blank 10 shown has: a first main surface 11 and a second main surface 12 opposite to each other in the height direction T; a first end surface 13 and a second end surface 14 opposite to each other in the length direction L; and a first side surface 15 and a second side surface 16 opposite to each other in the width direction W. Figure 1 In the example shown, the first main surface 11 of the body 10 is provided with the first external electrode E1 , the second external electrode E2 , the third external electrode E3 , and the fourth external electrode E4 , which corresponds to the mounting surface (bottom surface) of the body 10 .

[0029] The blank 10 is formed by stacking a plurality of magnetic layers ML in a stacking direction. In addition, the blank 10 may include a first coil 21 having a first conductor C1 described later and a second coil 22 having a second conductor C2. Figure 3 As shown, the green body 10 is formed by stacking the stacking groups G1 to G10 and forming the external electrodes E1 to E4 on the lower side of the stacking group G10. In addition, the boundaries between the layers of the stacking structure of the green body 10 may disappear. In addition, each stacking group G1 to G10 may be formed by stacking a plurality of the same pattern.

[0030] The laminate group G1 may include a magnetic layer ML, which constitutes the second main surface 12 of the green body 10 .

[0031] The stacking group G2 includes a magnetic layer ML, and a first conductor C1 and a second conductor C2 arranged in the same layer. Moreover, the area of ​​the first conductor C1 in the same layer when viewed from the stacking direction is approximately equal to the area of ​​the second conductor C2 when viewed from the stacking direction. Here, approximately equal includes a range of ±10%, and more preferably, it can also be within ±5%. In addition, for example, by photographing the surface of the stacking group obtained by grinding the inductor sample parallel to LW with a digital microscope, the area of ​​the first conductor C1 and the area of ​​the second conductor C2 can be calculated based on the obtained photograph using an image analysis function.

[0032] The first conductor C1 of the stacking group G2 can be arranged along both sides of the corner portion (for example, the corner portion close to the third external electrode E3 when viewed in a plan view) forming the magnetic layer ML. That is, the first conductor C1 can be formed into an L-shape when viewed from above in the stacking direction. A second through hole (not shown) connected to the second external electrode E2 can be provided at one end portion of the first conductor C1 (for example, the end portion close to the second external electrode E2 when viewed in a plan view). In addition, a through hole (not shown) connected to the first through hole V1 of the stacking group G3 can be provided at the other end portion of the first conductor C1 (for example, the end portion close to the fourth external electrode E4 when viewed in a plan view). In addition, the end portion includes not only the front end portion but also the area near the front end portion.

[0033] The second conductor C2 of the stacking group G2 can be arranged along the two sides of the other corners (for example, the corners close to the first external electrode E1 when viewed in a plan view) forming the magnetic layer ML. That is, the second conductor C2 can be formed into an L shape when viewed from the stacking direction. A through hole (not shown) connected to the second through hole V2 of the stacking group G3 can be provided at one end of the second conductor C2 (for example, the end close to the second external electrode E2 when viewed in a plan view). In addition, a fourth through hole (not shown) connected to the fourth external electrode E4 can be provided at the other end of the second conductor C2 (for example, the position close to the fourth external electrode E4 when viewed in a plan view).

[0034] The stacked group G3 may include: a magnetic layer ML; a first through hole V1 connecting first conductors C1 adjacent to each other in the stacking direction; a second through hole V2 connecting second conductors C2 adjacent to each other in the stacking direction; a second through hole T2; and a fourth through hole T4.

[0035] The first through hole V1 of the stacking group G3 can be arranged at a position connected to the other end of the first conductor C1 of the stacking group G2 (the end close to the fourth external electrode E4 in a plan perspective view). The first through hole V1 of the stacking group G3 can be arranged adjacent to the fourth through hole T4 in a plan view from the stacking direction at a distance that can ensure electrical insulation.

[0036] The second through hole V2 of the stacking group G3 can be arranged at a position connected to one end of the second conductor C2 of the stacking group G2 (the end close to the second external electrode E2 in a plan view). The second through hole V2 of the stacking group G3 can be arranged adjacent to the second through hole T2 in a plan view from the stacking direction at a distance that can ensure electrical insulation.

[0037] The second through holes T2 of the stacked group G3 can connect the second through holes T2 of the stacked groups G2 and G4 adjacent in the stacking direction to each other and be electrically connected to the second external electrode E2. Therefore, the second through holes T2 can be arranged on the second external electrode E2 in a plan view.

[0038] The fourth through hole T4 of the stacked group G3 can connect the fourth through holes T4 of the stacked groups G2 and G4 adjacent in the stacking direction to each other and be electrically connected to the fourth external electrode E4. Therefore, the fourth through hole T4 can be arranged on the fourth external electrode E4 in a plan view.

[0039] The stacked group G4 may include: a magnetic layer ML; a first conductor C1 and a second conductor C2 arranged in the same layer; a second through hole T2; and a fourth through hole T4. Furthermore, the area of ​​the first conductor C1 in the same layer when viewed from the stacking direction is substantially equal to the area of ​​the second conductor C2 when viewed from the stacking direction. Here, substantially equal includes a range of ±10%, and more preferably, may be within ±5%.

[0040] The first conductor C1 of the stacking group G4 can be connected to the first conductor C1 of the stacking group G2 via the first through hole V1 of the stacking group G3, and constitute a part of the winding of the first coil 21. Specifically, the first conductor C1 of the stacking group G4 can also have an avoidance portion A that avoids the fourth through hole T4 and is located on at least one side of the magnetic layer ML on the opposite side of the side of the magnetic layer ML along the first conductor C1 of the stacking group G2 when viewed from the stacking direction. The specific form of the avoidance portion A will be described later. A through hole (not shown) connected to the first through hole V1 of the stacking group G5 can be provided at one end of the first conductor C1 (the end close to the second external electrode E2 when viewed from a plane perspective). In addition, the other end of the first conductor C1 (the end close to the fourth external electrode E4 when viewed from a plane perspective) can be connected to the first through hole V1 of the stacking group G3.

[0041] The second conductor C2 of the stacking group G4 can be connected to the second conductor C2 of the stacking group G2 via the second through hole V2 of the stacking group G3, and can constitute a part of the winding of the second coil 22. Specifically, the second conductor C2 of the stacking group G4 can have an avoidance portion A that avoids the second through hole T2 along at least one side of the magnetic layer ML located on the opposite side to the side of the magnetic layer ML along the second conductor C2 of the stacking group G2 when viewed from the stacking direction. One end of the second conductor C2 (the end close to the second external electrode E2 when viewed from a plane) can be connected to the second through hole V2 of the stacking group G3. In addition, a through hole (not shown) connected to the second through hole V2 of the stacking group G5 can be provided at the other end of the second conductor C2 (the end close to the fourth external electrode E4 when viewed from a plane),

[0042] The second through holes T2 of the stacked group G4 can connect the second through holes T2 of the stacked groups G3 and G5 adjacent in the stacking direction to each other and be electrically connected to the second external electrode E2. Therefore, the second through holes T2 are arranged at the corners of the magnetic layer ML located on the second external electrode E2.

[0043] The fourth through hole T4 of the stacked group G4 can connect the fourth through holes T4 of the stacked groups G3 and G5 adjacent in the stacking direction to each other and be electrically connected to the fourth external electrode E4. Therefore, the fourth through hole T4 can be arranged at the corner of the magnetic layer ML located on the fourth external electrode E4.

[0044] The stacked group G5 may include: the magnetic layer ML; a first through hole V1 connecting first conductors C1 adjacent to each other in the stacking direction; a second through hole V2 connecting second conductors C2 adjacent to each other in the stacking direction; a second through hole T2; and a fourth through hole T4.

[0045] The first through hole V1 of the stacked group G5 may be disposed at a position connected to one end of the first conductor C1 of the stacked group G4. The first through hole V1 of the stacked group G5 may be provided on the side of the magnetic layer ML opposite to the first through hole V1 of the stacked group G3 in plan view.

[0046] The second through hole V2 of the stacked group G5 may be arranged at a position connected to one end of the second conductor C2 of the stacked group G4. The second through hole V2 of the stacked group G5 may be provided on the side of the magnetic layer ML opposite to the second through hole V2 of the stacked group G3 in a plan perspective view.

[0047] The second through holes T2 of the stacked group G5 can connect the second through holes T2 of the stacked groups G4 and G6 adjacent in the stacking direction to each other and be electrically connected to the second external electrode E2. Therefore, the second through holes T2 can be arranged at the corners of the magnetic layer ML located on the second external electrode E2 in a plan view.

[0048] The fourth through hole T4 of the stacked group G5 can connect the fourth through holes T4 of the stacked groups G4 and G6 adjacent in the stacking direction to each other and be electrically connected to the fourth external electrode E4. Therefore, the fourth through hole T4 can be arranged at the corner of the magnetic layer ML located on the fourth external electrode E4 in a plan view.

[0049] The stacked group G6 may include: a magnetic layer ML; a first conductor C1 and a second conductor C2 arranged in the same layer; a second through hole T2; and a fourth through hole T4. Furthermore, the area of ​​the first conductor C1 in the same layer when viewed from the stacking direction is substantially equal to the area of ​​the second conductor C2 when viewed from the stacking direction. Here, substantially equal includes a range of ±10%, and more preferably, may be within ±5%.

[0050] The first conductor C1 of the stacking group G6 can be connected to the first conductor C1 of the stacking group G4 via the first through hole V1 of the stacking group G5, and constitute a part of the winding of the first coil 21. Specifically, the first conductor C1 of the stacking group G6 can have an avoidance portion A that avoids the second through hole T2 along at least one side of the magnetic layer ML located on the opposite side of the side of the magnetic layer ML along the first conductor C1 of the stacking group G4 when viewed from the top in the stacking direction. One end of the first conductor C1 can be connected to the first through hole V1 of the stacking group G5. In addition, a through hole (not shown) connected to the first through hole V1 of the stacking group G7 can be provided at the other end of the first conductor C1.

[0051] The second conductor C2 of the stacking group G6 can be connected to the second conductor C2 of the stacking group G4 via the second through hole V2 of the stacking group G5, and constitute a part of the winding of the second coil 22. Specifically, the second conductor C2 of the stacking group G6 can have an avoidance portion A that avoids the fourth through hole T4 along at least one side of the magnetic layer ML located on the side opposite to the side of the magnetic layer ML along the second conductor C2 of the stacking group G4 when viewed from the top in the stacking direction. One end of the second conductor C2 can be provided with a through hole (not shown) connected to the second through hole V2 of the stacking group G7. In addition, the other end of the second conductor C2 can be connected to the second through hole V2 of the stacking group G5.

[0052] The second through holes T2 of the stacked group G6 can connect the second through holes T2 of the stacked groups G5 and G7 adjacent in the stacking direction to each other and be electrically connected to the second external electrode E2. Therefore, the second through holes T2 can be arranged at the corner of the magnetic layer ML located on the second external electrode E2.

[0053] The fourth through hole T4 of the stacked group G6 can connect the fourth through holes T4 of the stacked groups G5 and G7 adjacent in the stacking direction to each other and be electrically connected to the fourth external electrode E4. Therefore, the fourth through hole T4 can be arranged at the corner of the magnetic layer ML located on the fourth external electrode E4.

[0054] The laminate group G7 may include: the magnetic layer ML; the first through hole V1 connecting the first conductors C1 to each other; the second through hole V2 connecting the second conductors C2 to each other; the second through hole T2; and the fourth through hole T4.

[0055] The first through hole V1 of the stacking group G7 may be arranged at a position connected to the other end of the first conductor C1 of the stacking group G6 (the end close to the third external electrode E3 in a plan perspective). The first through hole V1 of the stacking group G7 may be arranged adjacent to the fourth through hole T4 in a plan view from the stacking direction at a distance that can ensure insulation. The first through hole V1 of the stacking group G7 may be provided on the side of the magnetic layer ML on the opposite side to the first through hole V1 of the stacking group G5 in a plan perspective.

[0056] The second through hole V2 of the stacking group G7 may be arranged at a position connected to one end of the second conductor C2 of the stacking group G4 (the end close to the first external electrode E1 in a plan view), and the second through hole V2 of the stacking group G7 may be arranged adjacent to the second through hole T2 in a plan view from the stacking direction at a distance that can ensure insulation. The second through hole V2 of the stacking group G7 may be provided on the side of the magnetic layer ML on the opposite side to the second through hole V2 of the stacking group G5 in a plan view.

[0057] The second through holes T2 of the stacked group G7 can connect the second through holes T2 of the stacked groups G6 and G8 adjacent in the stacking direction to each other and be electrically connected to the second external electrode E2. Therefore, the second through holes T2 can be arranged at the corners of the magnetic layer ML located on the second external electrode E2 in a plan view.

[0058] The fourth through hole T4 of the stacked group G7 can connect the fourth through holes T4 of the stacked groups G6 and G8 adjacent in the stacking direction to each other and be electrically connected to the fourth external electrode E4. Therefore, the fourth through hole T4 can be arranged at the corner of the magnetic layer ML located on the fourth external electrode E4 in a plan view.

[0059] The stacked group G8 may include: a magnetic layer ML; a first conductor C1 and a second conductor C2 arranged in the same layer; a second through hole T2; and a fourth through hole T4. Furthermore, the area of ​​the first conductor C1 in the same layer when viewed from the stacking direction is substantially equal to the area of ​​the second conductor C2 when viewed from the stacking direction. Here, substantially equal includes a range of ±10%, and more preferably, may be within ±5%.

[0060] The first conductor C1 of the stacking group G8 can be connected to the first conductor C1 of the stacking group G6 via the first through hole V1 of the stacking group G7, and can constitute a part of the winding of the first coil 21. Specifically, the first conductor C1 of the stacking group G8 can have an avoidance portion A that avoids the fourth through hole T4 along at least one side of the magnetic layer ML located on the opposite side of the side of the magnetic layer ML along the first conductor C1 of the stacking group G6 when viewed from the stacking direction. A first through hole (not shown) connected to the first external electrode E1 can be provided at one end of the first conductor C1 (a position close to the first external electrode E1 when viewed from a plane perspective). In addition, the other end of the first conductor C1 (a position close to the third external electrode E3 when viewed from a plane perspective) can be connected to the first through hole V1 of the stacking group G7.

[0061] The second conductor C2 of the stacking group G8 can be connected to the second conductor C2 of the stacking group G6 via the second through hole V2 of the stacking group G7, and can constitute a part of the winding of the second coil 22. Specifically, the second conductor C2 of the stacking group G8 can have an avoidance portion A that avoids the second through hole T2 along at least one side of the magnetic layer ML located on the opposite side to the side of the magnetic layer ML along the second conductor C2 of the stacking group G6 when viewed from the stacking direction. One end of the second conductor C2 (a position close to the first external electrode E1 when viewed from a plane) can be connected to the second through hole V2 of the stacking group G7. In addition, a third through hole (not shown) connected to the third external electrode E3 can be provided at the other end of the first conductor C1 (a position close to the third external electrode E3 when viewed from a plane).

[0062] The stacked group G9 may include a magnetic layer ML, a first through hole T1, a second through hole T2, a third through hole, and a fourth through hole T4. The first through hole T1 to the fourth through hole T4 of the stacked groups G1 to G9 may have substantially the same planar area as viewed in the stacking direction.

[0063] The stacking group G10 may include a magnetic layer ML, a first through hole T1, a second through hole T2, a third through hole, and a fourth through hole T4. In the stacking group G10, the planar area of ​​the first through hole T1 to the fourth through hole T4 of the stacking group G10 as viewed from the stacking direction may be larger than the planar area of ​​the first through hole T1 to the fourth through hole T4 of the stacking group G1 to G9 as viewed from the stacking direction, and the thickness of the stacking group G10 may be thinner than the thickness of the stacking group 9. By making the planar area of ​​the first through hole T1 to the fourth through hole T4 of the stacking group G10 larger than the first external electrode E1 to the fourth external electrode E4, even if heat shrinkage due to firing occurs, alignment with the first external electrode E1 to the fourth external electrode E4 can be easily performed.

[0064] Here, the thickness of the first conductor C1 and / or the second conductor C2 in each stacked group may be the same. An example of the material of the first conductor C1 and / or the second conductor C2 may be a metal conductor such as Ag and / or Cu. For example, the first conductor C1 and / or the second conductor C2 may be formed by printing a conductive paste on the magnetic layer ML.

[0065] In addition, as an example of the material of the first to fourth through holes T4, the first through hole V1, and the second through hole V2, a metal conductor such as Ag and / or Cu may be used. In addition, the materials of the first to fourth through holes T4, the first through hole V1, and the second through hole V2 may be the same type of material as the first conductor C1 and / or the second conductor C2 described above, or may be different types of materials. For example, through holes may be formed in the magnetic layer ML, and conductive paste may be printed in the through holes to form through holes and through hole conductors, or after printing conductive paste, the magnetic layer ML may be printed outside the conductive paste to form through holes and through hole conductors.

[0066] As described above, if the base body 10 has a laminated structure including the laminated groups G1 to G10, the degree of freedom in designing the laminated inductor 1A becomes higher. For example, when the laminated inductor 1A is manufactured with the first external electrode E1, the second external electrode E2, the third external electrode E3, and the fourth external electrode E4 on the bottom surface (first main surface 11) of the base body 10, it is easy to lead the first coil 21 and the second coil 22 to the bottom surface side. In addition, the laminated structure including the laminated groups G1 to G10 may be formed by sequentially printing (for example, screen printing, etc.) the material constituting the magnetic layer ML, the material constituting the first conductor C1 or the second conductor C2, and the material constituting the through hole and / or the through hole from the second main surface 12 side or the first main surface 11 side of the base body 10 to laminate. In this case, each of the stacked groups G1 to G10 may be repeatedly printed until the magnetic layer ML, the first conductor C1 and / or the second conductor C2, and the through hole and / or the via hole have a desired thickness.

[0067] In addition, as one of the characteristics of the laminated inductor 1A of the present disclosure, in the laminated groups G1 to G10, the area of ​​the first conductor C1 in the same layer when viewed from the stacking direction and the area of ​​the second conductor C2 in the stacking direction when viewed from the stacking direction are substantially equal. Here, substantially equal includes a range of ±10%, and more preferably, may be within ±5%. Therefore, the difference in wiring resistance and inductance value caused by the area of ​​the first conductor C1 when viewed from the stacking direction and the difference in wiring resistance and inductance value caused by the area of ​​the second conductor C2 when viewed from the stacking direction can be reduced.

[0068] Furthermore, as one of the features of the laminated inductor 1A of the present disclosure, the first conductors C1 and the second conductors C2 are arranged alternately when viewed from a direction intersecting the lamination direction. More specifically, Figure 2 as well as Figure 3 In the embodiment, when the base body 10 is viewed from the longitudinal direction L (or the width direction W), the first conductors C1 and the second conductors C2 have regions R1 (see FIG. 1 ) in which they are alternately arranged. Figure 2 ). In this way, when the first conductor C1 and the second conductor C2 are provided in the same layer, the areas of the first conductor C1 and the second conductor C2 when viewed from the stacking direction are substantially equal, and when viewed from a direction intersecting the stacking direction, the first conductor C1 and the second conductor C2 are alternately arranged. Therefore, whether viewed from the stacking direction (viewed from the stacking direction from the top) or viewed from the direction intersecting the stacking direction, the reduction in the difference in wiring resistance and inductance value can be understood from the perspective of the shape / arrangement of the first conductor C1 and the second conductor C2.

[0069] The following describes additional elements related to the blank 10. The magnetic layer ML may include metal magnetic particles made of a magnetic material. The metal magnetic particles may include Fe and / or Si. More specifically, they may be Fe particles or Fe alloy particles. As Fe alloys, they may be Fe-Si alloys, Fe-Si-Cr alloys, Fe-Si-Al alloys, Fe-Si-BP-Cu-C alloys, Fe-Si-B-Nb-Cu alloys, and the like. In addition, the metal magnetic particles may also contain impurities such as Cr, Mn, Cu, Ni, P, S, or Co that are not desirable in manufacturing. In addition, the metal magnetic particles may be contained in a magnetic paste. Therefore, the metal magnetic particles may also contain elements that are more easily oxidized than Fe added when the magnetic paste is made (for example, Cr, Al, Li, and Zn).

[0070] The surfaces of the metal magnetic particles may be covered with an insulating coating (not shown). If the surfaces of the metal magnetic particles are covered with an insulating coating, the insulation between the metal magnetic particles can be improved.

[0071] As a method for forming an insulating coating on the surface of a metal magnetic particle, a sol-gel method, a mechanochemical method, etc. can be used. The material constituting the insulating coating can be an oxide such as P, Si, zinc phosphate, or manganese phosphate. In addition, the insulating coating can also be an oxide film formed by oxidizing the surface of the metal magnetic particle. The thickness of the insulating coating is preferably greater than 1 nm and less than 50 nm, more preferably greater than 1 nm and less than 30 nm, and further preferably greater than 1 nm and less than 20 nm. For example, a cross-section obtained by grinding a sample of an inductor can be photographed using a scanning electron microscope (SEM), and the thickness of the insulating coating covering the surface of the metal magnetic particle can be measured based on the obtained SEM photograph.

[0072] The average particle size of the metal magnetic particles in the magnetic layer ML is preferably 1 μm to 30 μm, more preferably 1 μm to 20 μm, and even more preferably 1 μm to 10 μm. The average particle size of the metal magnetic particles in the magnetic layer can be measured by the following procedure.

[0073] The sample of the inductor is cut to obtain a sample cross section. Specifically, the sample cross section is obtained by cutting through the center of the blank and orthogonally to the mounting surface and end surface of the blank. For the obtained cross section, a region (e.g., 130 μm × 100 μm) of multiple parts (e.g., 5 parts) is photographed using SEM, and the obtained SEM image is analyzed using image analysis software (e.g., image analysis software WinROOF2021 (manufactured by Mitani Shoji Co., Ltd.)) to obtain the equivalent circular diameter of the metal magnetic particles. The average value of the obtained equivalent circular diameter is set to the average particle size of the metal magnetic particles.

[0074] When the blank 10 is formed, heat treatment is performed. In this case, the metal magnetic particles included in the blank 10 have an oxide film on the surface. The oxide film originates from the metal magnetic particles and is formed by heat treatment. In the blank 10, adjacent metal magnetic particles can be bonded to each other via the oxide film.

[0075] In order to further improve the strength of the green body 10, the green body 10 may be impregnated with a resin material after being fired. As an example of the resin for improving the strength of the green body, epoxy resin and / or phenolic resin and / or silicone resin may be used.

[0076] - External Electrode -

[0077] The external electrodes are provided on the bottom surface of the green body 10. The external electrodes include a first external electrode E1, a second external electrode E2, a third external electrode E3, and a fourth external electrode E4. The first external electrode E1 and the second external electrode E2 can be electrically connected to the first coil 21. In addition, the third external electrode E3 and the fourth external electrode E4 can be electrically connected to the second coil 22. If the external electrodes are provided on the bottom surface (first main surface 11) of the green body 10, the laminated inductor 1A can be appropriately mounted on a mounting substrate or the like.

[0078] The first external electrode E1 may function as an input electrode and / or an output electrode for the first coil 21. The first external electrode E1 may be provided only on the first main surface 11 of the blank 10, or may be provided across at least one of the first main surface 11, the second end surface 14, the first side surface 15, or the second side surface 16 of the blank 10.

[0079] The second external electrode E2 may function as an input electrode and / or an output electrode for the second coil 22. The second external electrode E2 may be provided only on the first main surface 11 of the blank 10, or may be provided across at least one of the first main surface 11, the first end surface 13, and / or the first side surface 15 of the blank 10.

[0080] The third external electrode E3 may function as an input electrode and / or an output electrode for the second coil 22. The third external electrode E3 may be provided only on the first main surface 11 of the blank 10, or may be provided across at least one of the first main surface 11, the first end surface 13, and / or the second side surface 16 of the blank 10.

[0081] The fourth external electrode E4 can function as an input electrode and / or an output electrode for the second coil 22. The fourth external electrode E4 can also be provided only on the first main surface 11 of the blank 10, or can be provided across at least one of the first main surface 11, the second end surface 14 and / or the first side surface 15 of the blank 10.

[0082] As a preferred form of the external electrode, the planar area of ​​the external electrode observed from the mounting surface side of the green body 10 may be smaller than the planar area of ​​the first through hole T1 to the fourth through hole T4 of the stacked group G10. By making the planar area of ​​the external electrode smaller than the first through hole T1 to the fourth through hole T4 of the stacked group G10, it is possible to easily connect the external electrode requiring a predetermined positional accuracy on the green body to the through hole whose position is shifted due to thermal shrinkage caused by firing.

[0083] As an example, various materials such as Cu and / or Ni may be used for the external electrode. In addition, the external electrode may be formed of a single layer or a stacked structure of two or more layers. The external electrode may be formed by any method, but as an example, it may be a plated electrode formed by plating (e.g., electroless plating).

[0084] -First coil-

[0085] The first coil 21 is provided inside the blank 10. The first coil 21 provided inside the blank 10 includes a first winding portion W1 formed by connecting respective ends of a plurality of first conductors C1 disposed in different layers of the blank 10 via a first through hole V1, a first through hole T1, and a second through hole T2.

[0086] The first winding portion W1 may include the first conductor C1 and the first through hole V1 provided in the stacked groups G2 to G8. Specifically, the first winding portion W1 may be wound counterclockwise with respect to the second external electrode E2.

[0087] The first vias V1 can electrically connect the first conductors C1 provided in the stacking groups adjacent to each other in the stacking direction. The length of the first vias V1 in the stacking direction can be shorter than the length of the first through-holes T1 or the length of the second through-holes T2. In addition, the first conductors C1 can also have a stacking structure.

[0088] The first through hole T1 can connect the end of the first conductor C1 closest to the bottom surface (first main surface 11) of the body 10 among the ends of the first coil 21 and the first external electrode E1. The first through hole T1 can extend along the stacking direction (for example, the height direction T). The first through hole T1 can also have a stacking structure.

[0089] The second through hole T2 may connect the other end of the first coil 21 to the second external electrode E2. The second through hole T2 may extend along the stacking direction (eg, the height direction T). The second through hole T2 may also have a stacking structure.

[0090] - Second coil -

[0091] The second coil 22 is disposed inside the blank 10. The second coil 22 disposed inside the blank 10 includes a second winding portion W2 formed by connecting respective ends of a plurality of second conductors C2 disposed in different layers of the blank 10 via a second through hole V2, a third through hole T3, and a fourth through hole T4.

[0092] The second winding portion W2 may include a second conductor C2 and a second through hole V2 provided in the stacking groups G2 to G8. Specifically, the second winding portion W2 may be wound counterclockwise with respect to the fourth external electrode E4 located at a position oblique to the second external electrode E2. In the stacked inductor 1A of the present disclosure, in order to reduce the difference in DC resistance and / or inductance between the first coil 21 and the second coil 22, the number of windings of the first winding portion W1 and the number of windings of the second winding portion W2 may be substantially the same.

[0093] The second through hole V2 can electrically connect the second conductors C2 disposed in the stacking groups adjacent to each other in the stacking direction. The length of the second through hole V2 in the stacking direction can be shorter than the length of the third through hole T3 or the length of the fourth through hole T4. In addition, the second conductor C2 can also have a stacking structure.

[0094] The third through hole T3 can connect the end of the second conductor C2 closest to the bottom surface (first main surface 11) of the body 10 among the ends of the second coil 22 and the third external electrode E3. The third through hole T3 can extend along the stacking direction (for example, the height direction T). The third through hole T3 can also have a stacking structure.

[0095] The fourth through hole T4 may connect the other end of the second coil 22 and the fourth external electrode E4. The fourth through hole T4 may extend along the stacking direction (eg, the height direction T). The fourth through hole T4 may have a stacking structure.

[0096] As described above, according to the present disclosure, in an inductor including a plurality of coils therein, it is possible to reduce differences in the DC resistance and / or inductance value of each coil.

[0097] <Additional Structure of Laminated Inductor>

[0098] In the above-described laminated inductor 1A, when viewed from the lamination direction, the first conductor C1 and the second conductor C2 may be in a point-symmetric relationship with the center of the magnetic layer ML as an axis. Figure 3 In the stacked groups G2 , G4 , G6 , and G8 including the first conductor C1 and the second conductor C2 , when the stacked groups G2 , G4 , G6 , and G8 are rotated 180 degrees with the center of the magnetic layer ML as an axis, the stacked groups G2 , G4 , G6 , and G8 overlap.

[0099] According to such a structure, the area of ​​the first conductor C1 in plan view from the stacking direction and the area of ​​the second conductor C2 in plan view from the stacking direction in the same layer are substantially equal, so that the difference in DC resistance and / or inductance value of each coil can be further reduced.

[0100] In the above-mentioned laminated inductor 1A, when viewed from above in the lamination direction, the first conductor C1 and the second conductor C2 may overlap in the overlapping region. That is, the arrangement relationship between the first conductor C1 and the second conductor C2 is determined between different lamination groups. More specifically, the first conductor C1 of the lamination group G2 is arranged along both sides of the corner portion forming the magnetic body layer ML (for example, the corner portion close to the third external electrode E3 when viewed from a plane perspective), and the second conductor C2 of the lamination group G4 is arranged along a part of both sides of the corner portion forming the magnetic layer (for example, the corner portion close to the third external electrode E3 when viewed from a plane perspective). Therefore, between the lamination groups G2 and G4, when viewed from above in the lamination direction, there is an overlapping region R2 where the first conductor C1 and the second conductor C2 overlap.

[0101] According to such a structure, the positional relationship between the first conductor C1 and the second conductor C2 is determined not only in the same stacking group but also between different stacking groups, and the first conductor C1 and the second conductor C2 have an overlapping area. As a result, the first conductor C1 and the second conductor C2 have substantially similar shapes. Therefore, the coupling between the first coil 21 and the second coil 22 can be increased.

[0102] In the above-mentioned laminated inductor 1A, the first conductor C1 may include a first avoidance portion A1 that avoids the second through hole T2, and / or the second conductor C2 may include a second avoidance portion A2 that avoids the fourth through hole T4. According to such a structure, when viewed from the top in the stacking direction, the second through hole T2 and the fourth through hole T4 can be arranged at positions avoided by the first avoidance portion A1 and the second avoidance portion A2, so that the laminated inductor can be made smaller when viewed from the top in the stacking direction, compared with a laminated inductor without the avoidance portion.

[0103] As a more preferred technical solution of the avoidance portion, the first avoidance portion A1 may be located on the inner side of the magnetic layer ML than the second through hole T2 when viewed from the stacking direction, and / or the second avoidance portion A2 may be located on the inner side of the magnetic layer ML than the fourth through hole T4 when viewed from the stacking direction. According to such a structure, compared with a stacked inductor without the avoidance portion, the stacked inductor can be made smaller when viewed from the stacking direction.

[0104] In the above-mentioned laminated inductor 1A, the first external electrode E1, the second external electrode E2, the third external electrode E3, and the fourth external electrode E4 can be provided at the corners of the rectangular-shaped green body 10 when viewed from the stacking direction. By providing the first to fourth external electrodes E4 at the corners of the rectangular-shaped green body 10 when viewed from the stacking direction, the external electrodes can be separated as much as possible, thereby improving the insulation withstand voltage between the external electrodes.

[0105] In the above-mentioned laminated inductor 1A, an insulating layer IL may be disposed between the first conductor C1 and the second conductor C2 in the lamination direction (see Figure 5 As an example, Figure 3 The magnetic layer ML of the stacked groups G3, G5, and G7 shown is replaced with an insulating layer IL. By providing the insulating layer IL between the first conductor C1 and the second conductor C2 in the stacking direction, the dielectric withstand voltage between the first conductor C1 and the second conductor C2 can be increased.

[0106] <Stacked Inductor Array>

[0107] Next, refer to Figure 6 While explaining the stacked inductor array of the present invention. In the stacked inductor array 1B of the present invention, the first coil and the second coil are arranged side by side in a direction intersecting the stacking direction to form a coil array. Specifically, in addition to the first coil 21 and the second coil 22, the third coil 23 and the fourth coil 24, and the fifth coil 25 and the sixth coil 26 may also be included. In addition, the third coil 23 and the fifth coil 25 are substantially the same structure as the first coil 21, and the fourth coil 24 and the sixth coil 26 are substantially the same structure as the second coil 22.

[0108] The third coil 23 can be electrically connected to the fifth external electrode E5 and the sixth external electrode (not shown). The end of the third conductor closest to the bottom surface among the ends of the third coil 23 can be connected to the fifth external electrode E5 through the fifth through hole T5. In addition, the other end of the third conductor can be connected to the sixth external electrode (not shown) through the sixth through hole T6.

[0109] The fourth coil 24 can be electrically connected to the seventh external electrode (not shown) and the eighth external electrode E8. The end of the fourth conductor closest to the bottom surface of the fourth coil 24 can be connected to the seventh external electrode (not shown) through the seventh through hole (not shown). In addition, the other end of the fourth conductor can be connected to the eighth external electrode E8 through the eighth through hole T8.

[0110] The fifth coil 25 can be electrically connected to the ninth external electrode E9 and the tenth external electrode (not shown). The end of the fifth conductor closest to the bottom surface among the ends of the fifth coil 25 can be connected to the ninth external electrode E9 through the ninth through hole T9. In addition, the other end of the fifth conductor can be connected to the tenth external electrode (not shown) through the tenth through hole T10.

[0111] The sixth coil 26 can be electrically connected to the eleventh external electrode (not shown) and the twelfth external electrode E12. The end of the sixth conductor closest to the bottom surface among the ends of the sixth coil 26 can be connected to the eleventh external electrode (not shown) through the eleventh through hole (not shown). In addition, the other end of the sixth conductor can be connected to the twelfth external electrode E12 through the twelfth through hole T12.

[0112] Even in the stacked inductor array 1B of the present disclosure, the first conductor and the second conductor are arranged in the same layer, the area of ​​the first conductor in the same layer when viewed from the stacking direction is substantially equal to the area of ​​the second conductor in the same layer when viewed from the stacking direction, and the first conductor and the second conductor are arranged alternately when viewed from a direction intersecting the stacking direction, the third conductor and the fourth conductor are arranged in the same layer, the area of ​​the third conductor in the same layer when viewed from the stacking direction is substantially equal to the area of ​​the fourth conductor in the same layer when viewed from the stacking direction, and the third conductor and the fourth conductor are arranged alternately when viewed from a direction intersecting the stacking direction. Therefore, the difference in DC resistance and / or inductance value of each coil can be reduced.

[0113] In addition, the technical scope of the present disclosure is not only interpreted by the above-mentioned embodiment, but is divided based on the description of the claims. In addition, the technical scope of the present disclosure includes all changes within the meaning and scope equivalent to the claims.

[0114] The stacked inductor and stacked inductor array disclosed in the present invention include the following technical solutions.

[0115] <1>

[0116] A stacked inductor, comprising:

[0117] The green body is formed by stacking a plurality of magnetic layers in a stacking direction;

[0118] A first external electrode, a second external electrode, a third external electrode and a fourth external electrode are arranged on the bottom surface of the above-mentioned green body;

[0119] a first coil including a first winding portion, a first through hole, and a second through hole, wherein the first winding portion is formed by connecting respective ends of a plurality of first conductors arranged in mutually different layers of the base body through the through hole, the first through hole connecting one end of the first winding portion relatively close to the bottom surface to the first external electrode, and the second through hole connecting the other end of the first winding portion relatively far from the bottom surface to the second external electrode; and

[0120] The second coil includes a second winding portion, a third through hole, and a fourth through hole, wherein the second winding portion is formed by connecting the ends of a plurality of second conductors arranged in different layers of the base body through the through hole, the third through hole connects one end of the second winding portion relatively close to the bottom surface to the third external electrode, and the fourth through hole connects the other end of the second winding portion relatively far from the bottom surface to the fourth external electrode.

[0121] The first conductor and the second conductor are arranged in the same layer, and the area of ​​the first conductor in the same layer when viewed from above is substantially equal to the area of ​​the second conductor in the same layer when viewed from above.

[0122] The first conductors and the second conductors are arranged alternately with each other when viewed from a direction intersecting the stacking direction.

[0123] <2>

[0124] The multilayer inductor according to <1>, wherein:

[0125] The first conductor and the second conductor are in a point-symmetric relationship with respect to the center of the magnetic layer as an axis in a plan view.

[0126] <3>

[0127] The multilayer inductor according to <1> or <2>, wherein:

[0128] The first conductor and the second conductor overlap each other in an overlapping region when viewed from above.

[0129] <4>

[0130] The multilayer inductor according to any one of <1> to <3>, wherein:

[0131] The first conductor has a first avoidance portion avoiding the second through hole, and / or the second conductor has a second avoidance portion avoiding the fourth through hole.

[0132] <5>

[0133] The multilayer inductor according to <4>, wherein:

[0134] The first avoidance portion is located on the inner side of the magnetic layer than the second through hole in a plan view, and / or the second avoidance portion is located on the inner side of the magnetic layer than the fourth through hole in a plan view.

[0135] <6>

[0136] The multilayer inductor according to any one of <1> to <5>, wherein:

[0137] The first external electrode, the second external electrode, the third external electrode, and the fourth external electrode are respectively provided at corners of the base body which is rectangular in a plan view.

[0138] <7>

[0139] The multilayer inductor according to any one of <1> to <6>, wherein:

[0140] An insulating layer is arranged between the first conductor and the second conductor in the stacking direction.

[0141] <8>

[0142] A stacked inductor array, comprising:

[0143] The green body is formed by stacking a plurality of magnetic layers in a stacking direction;

[0144] A first external electrode, a second external electrode, a third external electrode, a fourth external electrode, a fifth external electrode, a sixth external electrode, a seventh external electrode and an eighth external electrode are disposed on the bottom surface of the above-mentioned green body;

[0145] a first coil including a first winding portion, a first through hole, and a second through hole, wherein the first winding portion is formed by connecting respective ends of a plurality of first conductors arranged in mutually different layers of the base body through the through hole, the first through hole connecting one end of the first winding portion relatively close to the bottom surface to the first external electrode, and the second through hole connecting the other end of the first winding portion relatively far from the bottom surface to the second external electrode;

[0146] a second coil including a second winding portion, a third through hole, and a fourth through hole, wherein the second winding portion is formed by connecting respective ends of a plurality of second conductors arranged in mutually different layers of the above-mentioned base body through the through hole, the third through hole connecting one end of the above-mentioned second winding portion relatively close to the above-mentioned bottom surface to the above-mentioned third external electrode, and the fourth through hole connecting the other end of the above-mentioned second winding portion relatively far from the above-mentioned bottom surface to the above-mentioned fourth external electrode;

[0147] a third coil including a third winding portion, a fifth through hole, and a sixth through hole, wherein the third winding portion is formed by connecting respective ends of a plurality of third conductors arranged in mutually different layers of the base body through the through hole, the fifth through hole connecting one end of the third winding portion relatively close to the bottom surface to the fifth external electrode, and the sixth through hole connecting the other end of the third winding portion relatively far from the bottom surface to the sixth external electrode; and

[0148] a fourth coil including a fourth winding portion, a seventh through hole, and an eighth through hole, wherein the fourth winding portion is formed by connecting respective ends of a plurality of fourth conductors arranged on mutually different layers of the above-mentioned base body through the through hole, the seventh through hole connecting one end of the above-mentioned fourth winding portion relatively close to the above-mentioned bottom surface to the above-mentioned seventh external electrode, and the eighth through hole connecting the other end of the above-mentioned fourth winding portion relatively far from the above-mentioned bottom surface to the above-mentioned eighth external electrode,

[0149] The third coil and the fourth coil are adjacent to the first coil and the second coil in a direction intersecting the stacking direction.

[0150] The first conductor and the second conductor are arranged in the same layer, and the area of ​​the first conductor in the same layer when viewed from above is substantially equal to the area of ​​the second conductor in the same layer when viewed from above.

[0151] When viewed from a direction intersecting the stacking direction, the first conductors and the second conductors are arranged alternately.

[0152] The third conductor and the fourth conductor are arranged in the same layer, and the area of ​​the third conductor in the same layer when viewed from above is substantially equal to the area of ​​the fourth conductor in the same layer when viewed from above.

[0153] The third conductors and the fourth conductors are arranged alternately with each other when viewed from a direction intersecting the stacking direction.

[0154] [Industrial Applicability]

[0155] The present disclosure can be used for a stacked inductor and a stacked inductor array, and in an inductor including a plurality of coils therein, it is possible to reduce the difference in DC resistance and / or inductance value of each coil.

Claims

1. A stacked inductor, wherein: have: The green body is formed by stacking a plurality of magnetic layers in a stacking direction; A first external electrode, a second external electrode, a third external electrode and a fourth external electrode are arranged on the bottom surface of the green body; a first coil including a first winding portion, a first through hole, and a second through hole, wherein the first winding portion is formed by connecting respective ends of a plurality of first conductors arranged in mutually different layers of the base body through the through hole, the first through hole connecting one end of the first winding portion relatively close to the bottom surface and the first external electrode, and the second through hole connecting the other end of the first winding portion relatively far from the bottom surface and the second external electrode; as well as The second coil includes a second winding portion, a third through hole, and a fourth through hole, wherein the second winding portion is formed by connecting the ends of a plurality of second conductors arranged in different layers of the base body through the through hole, the third through hole connecting one end of the second winding portion relatively close to the bottom surface and the third external electrode, and the fourth through hole connecting the other end of the second winding portion relatively far from the bottom surface and the fourth external electrode. The first conductor and the second conductor are arranged in the same layer, and the area of ​​the first conductor in the same layer when viewed from above is substantially equal to the area of ​​the second conductor in the same layer when viewed from above. The first conductors and the second conductors are arranged alternately with each other when viewed from a direction intersecting the stacking direction.

2. The laminated inductor according to claim 1, wherein: In a plan view, the first conductor and the second conductor are in a point-symmetric relationship with the center of the magnetic layer as an axis.

3. The laminated inductor according to claim 1 or 2, wherein: In a plan view, the first conductor and the second conductor overlap each other in an overlapping region.

4. The laminated inductor according to any one of claims 1 to 3, wherein: The first conductor has a first avoidance portion avoiding the second through hole, and / or the second conductor has a second avoidance portion avoiding the fourth through hole.

5. The stacked inductor according to claim 4, wherein: The first avoidance portion is located on the inner side of the magnetic layer than the second through hole in a plan view, and / or the second avoidance portion is located on the inner side of the magnetic layer than the fourth through hole in a plan view.

6. The laminated inductor according to any one of claims 1 to 5, wherein: The first external electrode, the second external electrode, the third external electrode, and the fourth external electrode are respectively provided at corners of the green body which is rectangular in plan view.

7. The laminated inductor according to any one of claims 1 to 6, wherein: In the stacking direction, an insulating layer is arranged between the first conductor and the second conductor.

8. A stacked inductor array, wherein: have: The green body is formed by stacking a plurality of magnetic layers in a stacking direction; A first external electrode, a second external electrode, a third external electrode, a fourth external electrode, a fifth external electrode, a sixth external electrode, a seventh external electrode and an eighth external electrode are disposed on the bottom surface of the green body; a first coil including a first winding portion, a first through hole, and a second through hole, wherein the first winding portion is formed by connecting respective ends of a plurality of first conductors arranged in mutually different layers of the base body through the through hole, the first through hole connecting one end of the first winding portion relatively close to the bottom surface and the first external electrode, and the second through hole connecting the other end of the first winding portion relatively far from the bottom surface and the second external electrode; a second coil including a second winding portion, a third through hole, and a fourth through hole, wherein the second winding portion is formed by connecting respective ends of a plurality of second conductors arranged in mutually different layers of the base body through the through hole, the third through hole connecting one end of the second winding portion relatively close to the bottom surface and the third external electrode, and the fourth through hole connecting the other end of the second winding portion relatively far from the bottom surface and the fourth external electrode; a third coil including a third winding portion, a fifth through hole, and a sixth through hole, wherein the third winding portion is formed by connecting respective ends of a plurality of third conductors arranged in mutually different layers of the base body through the through hole, the fifth through hole connecting one end of the third winding portion relatively close to the bottom surface and the fifth external electrode, and the sixth through hole connecting the other end of the third winding portion relatively far from the bottom surface and the sixth external electrode; as well as a fourth coil including a fourth winding portion, a seventh through hole, and an eighth through hole, wherein the fourth winding portion is formed by connecting respective ends of a plurality of fourth conductors arranged on mutually different layers of the base body through the through hole, the seventh through hole connecting one end of the fourth winding portion relatively close to the bottom surface to the seventh external electrode, and the eighth through hole connecting the other end of the fourth winding portion relatively far from the bottom surface to the eighth external electrode, The third coil and the fourth coil are adjacent to the first coil and the second coil in a direction intersecting the stacking direction. The first conductor and the second conductor are arranged in the same layer, and the area of ​​the first conductor in the same layer when viewed from above is substantially equal to the area of ​​the second conductor in the same layer when viewed from above. When viewed from a direction intersecting the stacking direction, the first conductors and the second conductors are arranged alternately with each other. The third conductor and the fourth conductor are arranged in the same layer, and the area of ​​the third conductor in the same layer when viewed from above is substantially equal to the area of ​​the fourth conductor in the same layer when viewed from above. The third conductors and the fourth conductors are arranged alternately with each other when viewed from a direction intersecting the stacking direction.

Images