Laminated coil and laminated coil array

Abstract

The invention provides a laminated coil and a laminated coil array which can reduce the reduction of electrical characteristics. A first coil (21) provided inside the body (10) and including a plurality of first coil conductor layers (51) in the lamination direction; a second coil (22) including a plurality of second coil conductor layers in the lamination direction; a first external electrode (31) and a second external electrode (32) electrically connected to the first coil (21); and a second coil (22). And a third external electrode (33) and a fourth external electrode (34) electrically connected to each other, the first to fourth external electrodes being disposed on the bottom surface of the element (10), and the second coil (22) being provided farther from the bottom surface of the element (10) than the first coil (21) in the stacking direction, the second coil (22) being provided with: a first lead-out conductor (41) provided inside the element (10) and having a first lead-out section (41); connecting an end portion of a first coil conductor layer (51) closest to the bottom surface among end portions of the first coil (21) to a first external electrode (31); a second lead-out conductor (42) that is provided inside the element (10) and connects the other end of the first coil (21) and the second external electrode (32); a third lead-out conductor (43) that is provided inside the element and connects an end of a second coil conductor layer (52) closest to the bottom surface among the ends of the second coil (22) to a third external electrode (33); and a fourth lead-out conductor (44) that is provided inside the element (10) and electrically connects the other end of the second coil (22) to the fourth external electrode (34), the second external electrode (32), and the third external electrode (33).

Description

Technical Field

[0001] The present disclosure relates to a stacked coil and a stacked coil array. Background Art

[0002] In recent years, as devices become more sophisticated, DC-DC converters in voltage conversion circuits have become increasingly efficient with higher currents. Consequently, the rated currents of power inductors used in these devices have also increased. One approach to achieving higher efficiency with higher currents is the multi-phase method, which adds the output currents from multiple inductors to increase the current. In this method, the output sides of each inductor are electrically connected to the output circuit board of each inductor.

[0003] Patent Document 1, which illustrates an example of the above-mentioned inductor, discloses a stacked coil array for a DC-DC converter, comprising: a base body including a magnetic layer containing magnetic particles; a first coil and a second coil embedded in the base body; and first, second, third, and fourth external electrodes provided on a surface of the base body and electrically connected to one of the ends of the first and second coils, respectively. A nonmagnetic layer is provided between the first and second coils. The first and second coils are each formed by connecting a plurality of coil conductors in a stacking direction. An end of the plurality of coil conductors of the first coil, whichever is closest to the second coil, is connected to the first external electrode, and the other end of the first coil is connected to the second external electrode. An end of the plurality of coil conductors of the second coil, whichever is closest to the first coil, is connected to the third external electrode, and the other end of the second coil is connected to the fourth external electrode. The first and third external electrodes are connected to output terminals of a switching element of the DC-DC converter.

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-61415.

[0005] When mounting the coil array described in Patent Document 1 on an output circuit board, for example, unintended voltages may be generated due to static electricity, resulting in a significant potential difference between the coils within the base body. Furthermore, this potential difference between the coils can cause a short circuit near the closest point of the coils, reducing the insulation resistance between the coils and degrading the electrical characteristics of the coils. Summary of the Invention

[0006] A main object of the present disclosure is to provide a laminated coil and a laminated coil array that reduce degradation of electrical characteristics.

[0007] The laminated coil disclosed herein comprises:

[0008] a green body, laminated with a magnetic layer;

[0009] A first coil and a second coil are provided inside the blank, the first coil including a plurality of first coil conductor layers in a stacking direction, and the second coil including a plurality of second coil conductor layers in the stacking direction;

[0010] A first external electrode and a second external electrode are electrically connected to the first coil;

[0011] a third external electrode and a fourth external electrode electrically connected to the second coil;

[0012] The first to fourth external electrodes are arranged on the bottom surface of the green body.

[0013] The second coil is provided at a position farther from the bottom surface of the base body than the first coil in the stacking direction.

[0014] The laminated coil includes:

[0015] a first lead conductor provided inside the base body and connecting an end portion of the first coil conductor layer closest to the bottom surface among the ends of the first coil to the first external electrode;

[0016] A second lead conductor is provided inside the green body and connects the other end of the first coil to the second external electrode;

[0017] a third lead conductor provided inside the base body and connecting an end portion of the second coil conductor layer closest to the bottom surface among the ends of the second coil to the third external electrode; and

[0018] The fourth lead conductor is provided inside the base body and connects the other end of the second coil to the fourth external electrode.

[0019] The second external electrode is electrically connected to the third external electrode.

[0020] Furthermore, the laminated coil array of the present disclosure includes:

[0021] a green body, laminated with a magnetic layer;

[0022] a first coil, a second coil, a third coil, and a fourth coil, disposed inside the blank, the first coil including a plurality of first coil conductor layers in a stacking direction, the second coil including a plurality of second coil conductor layers in the stacking direction, the third coil including a plurality of third coil conductor layers in the stacking direction, and the fourth coil including a plurality of fourth coil conductor layers in the stacking direction;

[0023] A first external electrode and a second external electrode are electrically connected to the first coil;

[0024] a third external electrode and a fourth external electrode electrically connected to the second coil;

[0025] a fifth external electrode and a sixth external electrode electrically connected to the third coil; and

[0026] The seventh external electrode and the eighth external electrode are electrically connected to the fourth coil.

[0027] The first to eighth external electrodes are arranged on the bottom surface of the green body.

[0028] The second coil is provided at a position farther from the bottom surface of the base body than the first coil in the stacking direction.

[0029] The fourth coil is provided at a position farther from the bottom surface of the base body than the third coil in the stacking direction.

[0030] The stacked coil array includes:

[0031] a first lead conductor provided inside the base body and connecting an end portion of the first coil conductor layer closest to the bottom surface among the ends of the first coil to the first external electrode;

[0032] A second lead conductor is provided inside the green body and connects the other end of the first coil to the second external electrode;

[0033] a third lead conductor provided inside the green body and connecting an end portion of the second coil conductor layer closest to the bottom surface among the ends of the second coil to the third external electrode;

[0034] a fourth lead conductor disposed inside the green body and connecting the other end of the second coil to the fourth external electrode;

[0035] a fifth lead conductor provided inside the green body and connecting an end portion of the third coil conductor layer closest to the bottom surface among the end portions of the third coil to the fifth external electrode;

[0036] a sixth lead conductor disposed inside the green body and connecting the other end of the third coil to the sixth external electrode;

[0037] a seventh lead conductor provided inside the base body and connecting an end portion of the fourth coil conductor layer closest to the bottom surface among the end portions of the fourth coil to the seventh external electrode; and

[0038] The eighth lead conductor is provided inside the base body and connects the other end of the fourth coil to the eighth external electrode.

[0039] The second external electrode is electrically connected to the third external electrode.

[0040] The sixth external electrode is electrically connected to the seventh external electrode.

[0041] According to the present disclosure, a stacked coil and a stacked coil array can be provided that minimize degradation in electrical properties. Specifically, because the second external electrode and the third external electrode are directly connected, even if an unintended voltage is generated in the stacked coil, short circuits between coils within the coil body can be prevented, minimizing the drop in insulation resistance between coils. Consequently, degradation in the electrical properties of the stacked coil can be minimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a perspective view schematically showing an example of a laminated coil according to the first embodiment.

[0043] Figure 2 This is a perspective view schematically showing an example of the internal structure of the laminated coil according to the first embodiment.

[0044] Figure 3 It is from Figure 2 The internal structure shown is a perspective view of the first coil, the first lead conductor, and the second lead conductor.

[0045] Figure 4 It is from Figure 2 The internal structure shown is a perspective view of the second coil, the third lead conductor, and the fourth lead conductor.

[0046] Figure 5 yes Figure 2 An exploded perspective view of the internal structure is shown.

[0047] Figure 6 yes Figure 5 A cross-sectional view taken along the arrow direction of line VI-VI.

[0048] Figure 7 It is a perspective view schematically showing an example of the internal structure of a modification of the first embodiment.

[0049] Figure 8A It is a perspective view (plan view) schematically showing an example of the internal structure of the laminated coil according to the second embodiment.

[0050] Figure 8B It is a perspective view (bottom view) schematically showing an example of the internal structure of the laminated coil according to the second embodiment.

[0051] Figure 9 This is an exploded perspective view of a portion of the internal structure of the laminated coil according to the second embodiment.

[0052] Figure 10 It is a perspective view (plan view) schematically showing an example of the internal structure of the laminated coil according to the third embodiment.

[0053] Figure 11 This is an exploded perspective view of a portion of the internal structure of the laminated coil according to the third embodiment.

[0054] Figure 12A This is a perspective view schematically showing an example of the internal structure of the laminated coil array of the present disclosure.

[0055] Figure 12B This is a perspective view schematically showing an example of the internal structure of the laminated coil array of the present disclosure.

[0056] Figure 12C This is a perspective view schematically showing an example of the internal structure of the laminated coil array of the present disclosure. DETAILED DESCRIPTION

[0057] The following describes the stacked coil and stacked coil array of the present disclosure. Furthermore, the present disclosure is not limited to the following configurations and may be appropriately modified without departing from the spirit of the present disclosure. Furthermore, configurations obtained by combining multiple preferred configurations described below also fall within the scope of the present disclosure.

[0058] The laminated coil and the laminated coil array disclosed herein are used in, for example, a DC-DC converter. The laminated coil and the laminated coil array disclosed herein can also be applied to applications other than DC-DC converters.

[0059] In this specification, terms indicating relationships between elements (e.g., "parallel," "orthogonal," etc.) and terms indicating the shapes of elements are not strictly literal; they also refer to substantially equivalent elements, for example, including differences of a few percent. Furthermore, in this specification, the direction in which the magnetic layers and conductive layers that constitute the base body are stacked is referred to as the "stacking direction."

[0060] The drawings shown below are schematic diagrams and may differ from actual products in size, aspect ratio, and other aspects.

[0061] <First embodiment of laminated coil>

[0062] First, refer to Figures 1 to 6 A first embodiment of the laminated coil of the present disclosure will be described. Figure 1is a perspective view schematically showing an example of a laminated coil according to the first embodiment. Figure 2 is a perspective view schematically showing an example of the internal structure of the laminated coil according to the first embodiment. Figure 3 It is from Figure 2 The internal structure shown is a three-dimensional diagram of the first coil, the first lead conductor and the second lead conductor. Figure 4 It is from Figure 2 The internal structure shown is a three-dimensional diagram of the second coil, the third lead conductor and the fourth lead conductor. Figure 5 yes Figure 2 The exploded perspective view of the internal structure shown, Figure 6 yes Figure 5 A cross-sectional view taken along the IV-IV line of FIG. The shapes and arrangements of the laminated coil and its components are not limited to the illustrated examples.

[0063] Figure 1 as well as Figure 2 The illustrated laminated coil 1 includes a base body 10, a first coil 21, a second coil 22, a first external electrode 31, a second external electrode 32, a third external electrode 33, a fourth external electrode 34, a first lead conductor 41, a second lead conductor 42, a third lead conductor 43, and a fourth lead conductor 44. Each component will be described in detail below.

[0064] -Body-

[0065] The blank 10 is, for example, a six-sided rectangular parallelepiped or substantially rectangular parallelepiped. The blank 10 may also have rounded corners and ridges. A corner is where three sides of the blank 10 intersect, and a ridge is where two sides of the blank 10 intersect.

[0066] exist Figure 1 as well as Figure 2 In the figure, the length, width, and height directions of the laminated coil 1 and the base body 10 are represented as L, W, and T, respectively. The length direction L, width direction W, and height direction T are orthogonal to each other. The mounting surface of the laminated coil 1 is, for example, a surface parallel to the length direction L and width direction W (LW surface).

[0067] Figure 1 The 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 perpendicular to the height direction T, and a first side surface 15 and a second side surface 16 opposite to each other in the width direction W perpendicular to the length direction L and the height direction T. Figure 1 In the example shown, the first main surface 11 of the blank 10 corresponds to the bottom surface of the blank 10 .

[0068] The body 10 includes a magnetic layer S (see Figure 5 ). In addition, it is preferred that the blank 10 has a stacked structure. Specifically, it is preferred that the blank 10 includes a plurality of magnetic layers S in the stacking direction (for example, the height direction T). In this embodiment, it is also possible to Figure 5 As shown, the base body 10 is formed by laminating magnetic layer groups G1 to G11 each including at least one magnetic layer S. In addition, the boundaries between the layers of the laminated structure may not be clearly visible.

[0069] As an example, the magnetic layer group G1 includes two magnetic layers S, which constitute the second main surface 12 of the body 10 .

[0070] As an example, the magnetic layer group G2 includes four magnetic layers S. The second coil conductor layer 52 is provided on the magnetic layer S, and one turn of the second coil 22 is formed by the four second coil conductor layers 52 .

[0071] As an example, the magnetic layer group G3 includes a single magnetic layer S. The magnetic layer S includes a conductor layer (via conductor) for connecting the second coil conductor layer 52 of the magnetic layer group G2 and the second coil conductor layer 52 of the magnetic layer group G4, and a fourth lead conductor 44 for electrically connecting the second coil conductor layer 52 and the fourth external electrode 34.

[0072] As an example, the magnetic layer group G4 includes four magnetic layers S. Second coil conductor layers 52 are provided on the magnetic layers S, and these four second coil conductor layers 52 constitute the other turns of the second coil 22. Fourth lead conductors 44 are provided at corners of the magnetic layer group G4.

[0073] As an example, the magnetic layer group G5 includes a double magnetic layer S. The magnetic layer S includes a third lead conductor 43 for electrically connecting the second coil conductor layer 52 and the third external electrode 33 , and a fourth lead conductor 44 for electrically connecting the second coil conductor layer 52 and the fourth external electrode 34 .

[0074] As an example, the magnetic layer group G6 includes four magnetic layers S. The first coil conductor layer 51 is provided on each magnetic layer S, and these four first coil conductor layers 51 constitute one turn of the first coil 21. Furthermore, in the magnetic layer group G6, the fourth lead conductor 44 and the third lead conductor 43 are provided at a corner portion on one side of each magnetic layer S.

[0075] As an example, the magnetic layer group G7 includes a single magnetic layer S. This magnetic layer S includes a conductor layer (via conductor) for connecting the first coil conductor layer 51 of the magnetic layer group G6 and the first coil conductor layer 51 of the magnetic layer group G8, and a second lead conductor 42 for electrically connecting the first coil conductor layer 51 and the second external electrode 32. Furthermore, in the magnetic layer group G7, the aforementioned fourth lead conductor 44 and third lead conductor 43 are provided at a corner portion on one side of each magnetic layer S.

[0076] As an example, the magnetic layer group G8 includes four magnetic layers S. First coil conductor layers 51 are provided on these magnetic layers S, and these four first coil conductor layers 51 constitute the remaining turns of the first coil 21. Furthermore, in the magnetic layer group G8, the aforementioned fourth lead conductor 44 and third lead conductor 43 are provided at one corner of each magnetic layer S. Furthermore, a second lead conductor 42 is provided at the other corner of each magnetic layer S.

[0077] As an example, the magnetic layer group G9 includes a double magnetic layer S. In the magnetic layer S, a first lead conductor 41 , a second lead conductor 42 , a third lead conductor 43 , and a fourth lead conductor 44 are provided at corners.

[0078] As an example, the magnetic layer group G10 includes a double magnetic layer S. The magnetic layer S is provided with a first lead conductor 41 and a fourth lead conductor 44 , and a conductor wiring H1 for directly connecting the second external electrode 32 and the third external electrode 33 .

[0079] As an example, the magnetic layer group G11 includes a double magnetic layer S. The magnetic layer S is provided with a first external electrode 31 , a second external electrode 32 , a third external electrode 33 , and a fourth external electrode 34 .

[0080] If the base body 10 has a laminated structure, the design freedom of the laminated coil 1 increases. For example, when manufacturing a laminated coil 1 having the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 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 toward the bottom surface.

[0081] The magnetic layer S includes magnetic particles made of a magnetic material. The magnetic particles may be particles of a metallic magnetic material such as Fe, Co, Ni, or alloys containing at least one of these metals (metal magnetic particles), or ferrite particles. The magnetic particles are preferably Fe particles or Fe alloy particles. Preferred Fe alloys include Fe-Si alloys, Fe-Si-Cr alloys, Fe-Si-Al alloys, Fe-Si-B-P-Cu-C alloys, and Fe-Si-B-Nb-Cu alloys.

[0082] The surface of the metal magnetic particles composed of the above-mentioned metal magnetic material is preferably covered with an insulating film. If the surface of the metal magnetic particles is covered with an insulating film, the insulation between the metal magnetic particles can be improved. As a method for forming an insulating film on the surface of the metal magnetic particles, a sol-gel method, a mechanochemical method, etc. can be used. The material constituting the insulating film is preferably an oxide of P, Si, etc. In addition, the insulating film can also be an oxide film formed by oxidizing the surface of the metal magnetic particles. The thickness of the insulating film is preferably 1 nm to 50 nm, more preferably 1 nm to 30 nm, and more preferably 1 nm to 20 nm. For example, a cross-section obtained by polishing a sample of a stacked coil array can be photographed with a scanning electron microscope (SEM), and the thickness of the insulating film covering the surface of the metal magnetic particles can be measured based on the obtained SEM photograph.

[0083] The average particle size of the metal magnetic particles in the magnetic layer S is preferably 1 μm to 30 μm, more preferably 1 μm to 20 μm, and 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 procedure described below. Use SEM to photograph multiple (for example, 5) areas (for example, 130 μm × 100 μm) of the cross section obtained by cutting the sample of the stacked coil, and use image analysis software (for example, image analysis software WinROOF2021 (manufactured by Mitani Shoji Co., Ltd.)) to analyze the obtained SEM image and calculate the circular equivalent diameter of the metal magnetic particles. The average value of the obtained circular equivalent diameter is taken as the average particle size of the metal magnetic particles.

[0084] Furthermore, when forming the blank 10, a heat treatment is performed. In this case, the metal magnetic particles included in the blank 10 have an oxide film on their surfaces. This oxide film originates from the metal magnetic particles and is formed by the heat treatment. In the blank 10, adjacent metal magnetic particles are bonded to each other via the oxide film.

[0085] The base body 10 may include a nonmagnetic layer between the first coil 21 and the second coil 22. Providing the nonmagnetic layer between the first coil 21 and the second coil 22 improves the insulation between the first coil 21 and the second coil 22, thereby preventing a short circuit between the two coils.

[0086] The non-magnetic layer may also include glass ceramic materials and non-magnetic ferrite materials as non-magnetic materials. Preferably, the non-magnetic layer includes a non-magnetic ferrite material as the non-magnetic material. The non-magnetic ferrite material may have the following composition: Fe (converted as Fe2O3) is 40 mol% to 49.5 mol%, Cu (converted as CuO) is 6 mol% to 12 mol%, and the remainder is ZnO. The non-magnetic material may contain additives such as Mn3O4, Co3O4, SnO2, Bi2O3, and SiO2 as needed, and may also contain trace amounts of unavoidable impurities. The non-magnetic layer preferably includes a Zn-Cu ferrite.

[0087] The thickness of the non-magnetic layer can be measured by the following procedure. Place the sample of the stacked coil vertically and solidify the periphery of the sample with resin. At this time, the LT surface is exposed. Polishing is completed by a polishing machine at a depth of about 1 / 2 in the W direction of the sample, so that a cross section parallel to the LT surface is exposed. In order to remove the sagging of the internal conductor caused by polishing, after the polishing is completed, the polished surface is processed by ion milling (ion milling device IM4000 manufactured by Hitachi High-Technologies Corporation). The approximate center of the non-magnetic layer in the polished sample is photographed with an SEM, and the thickness of the approximate center of the non-magnetic layer is measured from the obtained SEM photograph, which is defined as the thickness of the non-magnetic layer.

[0088] The base body 10 may include a nonmagnetic portion between the multiple first coil conductor layers 51 constituting the first coil 21, or between the multiple second coil conductor layers 52 constituting the second coil 22. In this case, the nonmagnetic portion is provided at least at one location between adjacent coil conductor layers in the first coil conductor layers 51 and the second coil conductor layers 52. Providing the nonmagnetic portion between adjacent coil conductor layers prevents magnetic flux from leaking between the coil conductor layers.

[0089] The non-magnetic layer and the non-magnetic portion preferably have the same composition. For example, the non-magnetic layer and the non-magnetic portion are preferably made of Zn—Cu ferrite.

[0090] A first coil 21 and a second coil 22 are provided within the blank 10. The first coil 21 and the second coil 22 are preferably magnetically coupled. Alternatively, one end of the first coil 21 and one end of the second coil 22 may be electrically connected as described below. Furthermore, two coils consisting of only the first coil 21 and the second coil 22 may be provided within the blank 10, or three or more coils consisting of the first coil 21 and the second coil 22 may be provided.

[0091] - First coil -

[0092] The first coil 21 includes a plurality of first coil conductor layers 51 in the stacking direction (e.g., the height direction T). Adjacent first coil conductor layers 51 are connected to each other via via conductors. In addition, the first coil 21 includes first coil conductor layers 51 formed in two different magnetic layer groups in the stacking direction, so that the number of turns can be set to 1.75 (see Figure 3 ) In addition, the number of turns is not limited to 1.75 as shown in the example of the figure, and may be, for example, 2 or more by stacking the first coil conductor layer 51 in the stacking direction.

[0093] It is preferable that the thickness of each of the first coil conductor layers 51 is the same. In addition, it is preferable that the thickness of the first coil conductor layer 51 is equal to the thickness of the second coil conductor layer 52 described later.

[0094] The first coil conductor layer 51 may be made of a metal conductor such as Ag, Cu, and / or Pd as an example of a material thereof. The first coil conductor layer 51 may be formed by printing a conductive paste on the magnetic layer S described above, for example.

[0095] Figure 3 It is from Figure 2 The internal structure shown is a perspective view of the first coil 21 , the first lead conductor 41 , and the second lead conductor 42 .

[0096] The first coil conductor layer 51 includes a relief portion 60 positioned inside each of the second lead conductor 42, the third lead conductor 43, and the fourth lead conductor 44 when viewed from above in the stacking direction (e.g., the height direction T), to avoid the second lead conductor 42, the third lead conductor 43, and the fourth lead conductor 44, and a straight portion 65 connected to the relief portion 60. The provision of the relief portion 60 increases the outer shape of the first coil and improves its characteristics. Furthermore, interference between the second lead conductor 42, the third lead conductor 43, and the fourth lead conductor 44 and the first coil conductor layer 51 is reduced, allowing wiring to be appropriately led from the first coil 21 to the external electrode.

[0097] Furthermore, the avoidance portion 60 of the first coil conductor layer 51 only needs to be positioned inside the second lead conductor 42 when viewed from above in the stacking direction (e.g., the height direction T) in order to avoid the second lead conductor 42. In other words, the first coil conductor layer 51 only needs to include the avoidance portion 60 for avoiding the second lead conductor 42, and does not need to include the avoidance portion 60 for avoiding at least one of the third lead conductor 43 and the fourth lead conductor 44.

[0098] - Second coil -

[0099] The second coil 22 is provided at a position farther from the bottom surface (first main surface 11 ) of the base body 10 than the first coil 21 is.

[0100] The second coil 22 includes a plurality of second coil conductor layers 52 in the stacking direction (e.g., the height direction T). Adjacent second coil conductor layers 52 are connected to each other via via conductors. In addition, the second coil 22 includes second coil conductor layers 52 formed in two different magnetic layer groups in the stacking direction, so that the number of turns can be set to 1.75 (see Figure 4 ). The number of turns is not limited to 1.75 as shown in the example, and can be increased to, for example, 2 or more by stacking the first coil conductor layer 51 in the stacking direction. Furthermore, the number of stacked layers of the second coil conductor layer 52 may be the same as or different from the number of stacked layers of the first coil conductor layer 51.

[0101] The thickness of each of the second coil conductor layers 52 is preferably the same. In addition, the thickness of the second coil conductor layer 52 is preferably equal to the thickness of the first coil conductor layer 51 .

[0102] The second coil conductor layer 52 can be made of a metal conductor such as Ag, Cu, and / or Pd, as an example. The second coil conductor layer 52 can be made of the same material as the first coil conductor layer 51, or a different material. The second coil conductor layer 52 can be formed, for example, by printing a conductive paste on the magnetic layer S described above.

[0103] Figure 4 It is from Figure 2 The internal structure shown is a perspective view of the second coil 22 , the third lead conductor 43 , and the fourth lead conductor 44 .

[0104] like Figure 4 As shown, the second coil conductor layer 52 may include an avoidance portion 60 disposed on the inner side of the fourth lead conductor 44 and a straight portion 65 connected to the avoidance portion 60 when viewed from above in the stacking direction (e.g., the height direction T) to avoid the fourth lead conductor 44. The provision of the avoidance portion 60 increases the outer shape of the second coil and improves the coil characteristics, while also reducing interference with the fourth lead conductor 44 and allowing wiring to be appropriately led from the second coil 22 to the external electrode.

[0105] - External electrodes -

[0106] The external electrodes include a first external electrode 31, a second external electrode 32, a third external electrode 33, and a fourth external electrode 34. The first external electrode 31 and the second external electrode 32 are provided on the bottom surface (first principal surface 11) of the base body 10 and are electrically connected to the first coil 21. The third external electrode 33 and the fourth external electrode 34 are provided on the bottom surface (first principal surface 11) of the base body 10 and are electrically connected to the second coil 22. In the laminated coil 1, the bottom surface (first principal surface 11) of the base body 10 can be used as the mounting surface. In other words, mounting on the bottom surface of the laminated coil 1 is possible.

[0107] The first external electrode 31 functions as an input electrode for the first coil 21. The first external electrode 31 may be provided only on the first principal surface 11 of the green body 10, or may be provided across the first principal surface 11 and at least one of the first end surface 13 and the second side surface 16 of the green body 10.

[0108] The second external electrode 32 functions as an output electrode for the first coil 21. The second external electrode 32 may be provided only on the first principal surface 11 of the base body 10, or may be provided across at least one of the first principal surface 11 and the second end surface 14 and the second side surface 16 of the base body 10.

[0109] The third external electrode 33 functions as an output electrode for the second coil 22. The third external electrode 33 may be provided only on the first principal surface 11 of the base body 10, or may be provided across at least one of the first principal surface 11 and the second end surface 14 and the first side surface 15 of the base body 10.

[0110] The fourth external electrode 34 functions as an input electrode for the second coil 22. The fourth external electrode 34 may be provided only on the first principal surface 11 of the green body 10, or may be provided across at least one of the first principal surface 11, the first end surface 13, and the first side surface 15 of the green body 10.

[0111] Since the external electrodes are configured as described above, the laminated coil 1 supplies current from the first external electrode 31, thereby causing the first coil 21 to be Figure 2 When the first coil 21 shown in the perspective view is turned on, the current flows clockwise. In addition, by supplying current from the fourth external electrode 34, the second coil 22 is turned on in the top view. Figure 2 When the second coil 22 is wound in the stereoscopic diagram, the current flows counterclockwise. In other words, the direction of the current flowing in the first coil 21 is opposite to the direction of the current flowing in the second coil 22. If this structure is expressed in other ways, the winding direction of the first coil 21 and the winding direction of the second coil 22 are opposite to each other when viewed from the electrodes on the output side (the second external electrode 32 and the third external electrode 33). Therefore, on the central axis of the first coil 21, a magnetic flux is generated in the direction from the upper surface to the bottom surface, and since the second coil 22 generates a magnetic flux in the direction from the bottom surface to the upper surface, the magnetic flux of the first coil 21 and the magnetic flux of the second coil 22 are wound to cancel each other out. As a result, the optimal characteristics of the inductor used as a multi-phase DC-DC converter can be obtained.

[0112] Furthermore, the laminated coil 1 of the present disclosure directly connects the second external electrode 32 to the third external electrode 33. More specifically, in the laminated coil 1 of the first embodiment, the second lead conductor 42, described later, is directly connected to the third lead conductor 43. This allows direct electrical conduction between the output-side end of the first coil 21 and the output-side end of the second coil 22, thereby reducing the potential difference between the two coils before substrate mounting. This reduces the possibility of unintended voltages being generated in the laminated coil before substrate mounting, causing the coils within the base body 10 to short-circuit and degrade the electrical characteristics of the inductor.

[0113] As a preferred arrangement of external electrodes, the second external electrode 32 and the third external electrode 33, which constitute the output electrodes of the laminated coil 1, are arranged along a side that forms the outer edge of the base body 10. In other words, the second external electrode 32 and the third external electrode 33 are not arranged along the diagonal lines of the base body 10 when viewed from above. This arrangement of external electrodes allows the output and input electrodes to be aligned on the same side of the base body, simplifying wiring to the substrate of the laminated coil 1.

[0114] The first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 can each be made of a conductive material such as Ag, Cu, and / or Pd. More preferably, these external electrodes can be plated with one or more materials selected from Ni, Sn, Cu, and Au. Plating with these materials enables proper mounting on a mounting substrate.

[0115] The thickness of each of the first external electrode 31 , the second external electrode 32 , the third external electrode 33 and the fourth external electrode 34 is preferably 5 μm to 100 μm, more preferably 10 μm to 50 μm.

[0116] The thickness of external electrodes, such as the first external electrode 31, can be measured using the procedure described in "Nonmagnetic Layer Thickness." Specifically, polish the sample using the above method and photograph the external electrodes using an SEM. In the resulting SEM photograph, measure a single point approximately in the center of the external electrode, and this is defined as the thickness of the external electrode.

[0117] -Lead-out conductor-

[0118] The lead conductors include a first lead conductor 41 , a second lead conductor 42 , a third lead conductor 43 , and a fourth lead conductor 44 . The first lead conductor 41 , the second lead conductor 42 , the third lead conductor 43 , and the fourth lead conductor 44 are disposed inside the base body 10 .

[0119] The first lead conductor 41 connects the end of the first coil conductor layer 51, which is closest to the bottom surface (first principal surface 11) of the base body 10, among the ends of the first coil 21, to the first external electrode 31. The first lead conductor 41 preferably extends along the stacking direction (e.g., the height direction T). The first lead conductor 41 may also have a stacked structure.

[0120] The second lead conductor 42 connects the other end of the first coil 21 to the second external electrode 32. The second lead conductor 42 preferably extends along the stacking direction (eg, the height direction T). The second lead conductor 42 preferably has a stacking structure.

[0121] The third lead conductor 43 connects the end of the second coil conductor layer 52 closest to the bottom surface (first principal surface 11) of the base body 10 among the ends of the second coil 22 to the third external electrode 33. The third lead conductor 43 preferably extends along the stacking direction (e.g., the height direction T). The third lead conductor 43 may also have a stacked structure.

[0122] The fourth lead conductor 44 connects the other end of the second coil 22 and the fourth external electrode 34. The fourth lead conductor 44 preferably extends along the stacking direction (eg, the height direction T). The fourth lead conductor 44 may have a stacking structure.

[0123] As described above, the second lead conductor 42 and the third lead conductor 43 are directly connected via the conductor wiring H1. This prevents the coils within the base body 10 from short-circuiting due to unintended voltages generated in the laminated coils, and reduces the reduction in insulation resistance between the coils. Consequently, degradation of the inductor's electrical characteristics can be minimized.

[0124] The conductor wiring H1 can be made of a conductive material such as Ag, Cu, and / or Pd, similar to the first coil conductor layer 51, the second coil conductor layer 52, and the external electrodes. Furthermore, the conductor wiring H1 can be made of the same material as the first coil conductor layer 51, the second coil conductor layer 52, and the external electrodes, or a different material.

[0125] The size of the conductor wiring H1 can be a size that can directly connect the second lead conductor 42 and the third lead conductor 43. For example, the size of the conductor wiring H1 is a size that is easy to print the conductive paste that constitutes the conductor wiring H1. Preferably, the thickness in the stacking direction is greater than 10 μm and less than 100 μm, and the width dimension perpendicular to the stacking direction is greater than 50 μm and less than 300 μm. In other words, the thickness of the conductor wiring H1 is preferably less than the width dimension of the conductor wiring H1. In addition, the "width dimension" in this specification takes into account the change in width dimension due to position, and refers to the width dimension at the position where the width dimension is the widest in a cross-section parallel to the same LT plane as the thickness measurement of the non-magnetic layer.

[0126] Furthermore, it is preferable that the thickness D1 of the conductor wiring H1 is equal to or smaller than the thickness D2 of the portion constituting one turn of the first coil 21 (or the second coil 22) (see Figure 6 ). In addition, it is preferable that the width dimension L1 of the conductor wiring H1 is less than the width dimension L2 of the portion constituting one turn of the first coil 21 (or the second coil 22) (see Figure 2 By setting the conductor wiring H1 to this size, interference with the magnetic flux of the first coil 21 and the second coil 22 can be reduced, and the second lead conductor 42 and the third lead conductor 43 can be directly connected as appropriate. Furthermore, one of the reasons for designing the thickness of the conductor wiring H1 as described above is that the first coil 21 or the second coil 22 requires low resistance to allow a large current to flow when operating as a DC-DC converter. However, the conductor wiring H1 mainly reduces the potential difference caused by static electricity before installation, and almost no current flows. This can reduce the degradation of the characteristics of the stacked coil.

[0127] Here, as a preferred arrangement of the first to fourth lead conductors 41 to 44, the second and third lead conductors 42 and 43, which are electrically connected to the output electrodes of the multilayer coil 1, are arranged along a side that constitutes the outer edge of the base body 10. In other words, the second and third lead conductors 42 and 43 are not arranged along a diagonal line of the base body 10 when viewed from above. This arrangement of the lead conductors allows the output and input electrodes to be aligned in the same direction.

[0128] <Modification of the First Embodiment of the Laminated Coil>

[0129] Next, refer to Figure 7 A laminated coil according to a modified example of the first embodiment will be described. Figure 7 This is a perspective view schematically showing an example of the internal structure of a modified example of the first embodiment. This modified example differs from the laminated coil of the first embodiment described above in that the coil conductor layer lacks a relief portion 60. The following description focuses on the differences from the laminated coil described in the first embodiment.

[0130] - First coil -

[0131] In this variation, the first coil conductor layer 51 of the first coil 21 is wound so as not to overlap with the third external electrode 33 and the fourth external electrode 34 when viewed from above. In other words, the first coil conductor layer 51 of the first coil 21 is wound separately from the third lead conductor 43 and the fourth lead conductor 44 when viewed from above.

[0132] - Second coil -

[0133] In this variation, the third lead conductor 43 and the fourth lead conductor 44, which are electrically connected to the ends of the second coil 22, are arranged outside the first coil conductor layer 51 of the first coil 21. In other words, the third lead conductor 43 and the fourth lead conductor 44, which are electrically connected to the ends of the second coil 22, are arranged so as not to overlap with the first coil 21 when viewed from above. On the other hand, the second coil conductor layer 52 of the second coil 22 is arranged so as to overlap with the first lead conductor 41 and the second lead conductor 42 when viewed from above.

[0134] According to the first coil 21 and the second coil 22 described above, the second coil 22 can be arranged above the first coil 21 without providing a avoiding portion, so that the manufacture of the laminated coil can be simplified.

[0135] <Second embodiment of laminated coil>

[0136] Next, refer to Figure 8A 、 Figure 8B as well as Figure 9 A laminated coil according to a second embodiment will be described. Figure 8A is a perspective view (top view) schematically showing an example of the internal structure of the laminated coil according to the second embodiment. Figure 8B is a perspective view (bottom view) schematically showing an example of the internal structure of the laminated coil according to the second embodiment. Figure 9 This is an exploded perspective view of a portion of the internal structure of a laminated coil according to the second embodiment. The laminated coil according to the second embodiment differs from the laminated coils according to the first embodiment and its modified example in that an insulating layer 70 is further provided on the first principal surface 11 of the base body 10, and that the second external electrode 32 and the third external electrode 33 are directly connected, rather than using the conductor wiring described in the first embodiment. The following description focuses on the differences from the laminated coils described in the above embodiments.

[0137] -Body-

[0138] In this embodiment, Figure 5 The magnetic layer groups G1 to G8 are stacked, and the bottom surface of the magnetic layer group G8 is stacked. Figure 9 The magnetic layer groups G9 and G10 are shown.

[0139] As an example, the magnetic layer group G9 includes a double magnetic layer S. In the magnetic layer S, a first lead conductor 41 , a second lead conductor 42 , a third lead conductor 43 , and a fourth lead conductor 44 are provided at corners.

[0140] As an example, the magnetic layer group G10 includes a double magnetic layer S. The magnetic layer S is provided with a first external electrode 31 and a fourth external electrode 34 , and an electrode wiring H2 for directly connecting the second external electrode 32 and the third external electrode 33 .

[0141] -Insulation layer-

[0142] The insulating layer 70 is a layer laminated on the first main surface 11 of the body 10 (see Figure 1 as well as Figure 9 ), for example, photoresist. Furthermore, the insulating layer 70 has openings at positions opposing the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34. These openings are filled with conductive members M electrically connected to the aforementioned external electrodes.

[0143] As an example, the conductive member M may be made of one or more plating materials selected from Ni, Sn, Cu, and Au in consideration of the bondability with the mounting substrate.

[0144] As a preferred aspect of this embodiment, the planar area of ​​the conductive member M is preferably different from the planar area of ​​the external electrodes 31 to 34. This allows the planar area of ​​the conductive member M to be designed to match the size of the mounting substrate electrodes, even when the size of the electrodes on the mounting substrate differs. Furthermore, the planar area of ​​the conductive member M is preferably smaller than the planar area of ​​the external electrodes 31 to 34. This allows the conductive member M to be accurately aligned due to compression, firing, and other factors in the green body.

[0145] - External electrodes -

[0146] The laminated coil of this embodiment does not use a conductor wiring directly connecting the second lead conductor 42 and the third lead conductor 43 , but electrically connects the second external electrode 32 and the third external electrode 33 via an electrode wiring H2 directly connecting the second external electrode 32 and the third external electrode 33 .

[0147] In the electrode wiring H2, the width dimension L4 perpendicular to the direction from the second external electrode 32 to the third external electrode 33 is preferably the same as the width dimension L3 of the second external electrode 32 and the width dimension L3 of the third external electrode (see Figure 8B ).

[0148] Even when the second external electrode 32 and the third external electrode 33 are electrically connected by the electrode wiring H2 that directly connects the second external electrode 32 and the third external electrode 33, as in the laminated coil of the second embodiment, it is possible to prevent unintended voltage from being generated in the laminated coil and short-circuiting the coils within the base body 10, thereby reducing the reduction in insulation resistance between the coils. Consequently, it is possible to minimize degradation in the electrical characteristics of the inductor.

[0149] <Third embodiment of laminated coil>

[0150] Next, refer to Figure 10 as well as Figure 11 A laminated coil according to a third embodiment will be described. Figure 10 is a perspective view (top view) schematically showing an example of the internal structure of the laminated coil according to the third embodiment. Figure 11 This is an exploded perspective view of a portion of the internal structure of a laminated coil according to a third embodiment. The laminated coil according to the third embodiment differs from the laminated coils of the aforementioned embodiments in that it includes conductor wiring that directly connects the second lead conductor and the third lead conductor, and electrode wiring that directly connects the second external electrode and the third external electrode. The following description focuses on the differences from the laminated coils described in the aforementioned embodiments.

[0151] -Body-

[0152] In this embodiment, Figure 5 The magnetic layer groups G1 to G9 are stacked, and the bottom surface of the magnetic layer group G9 is stacked. Figure 11 The magnetic layer groups G10 and G11 are shown.

[0153] As an example, the magnetic layer group G10 includes a double magnetic layer S. The magnetic layer S is provided with a first lead conductor 41 and a fourth lead conductor 44 , and a conductor wiring H1 for directly connecting the second external electrode 32 and the third external electrode 33 .

[0154] As an example, the magnetic layer group G11 includes a double magnetic layer S. The magnetic layer S is provided with a first external electrode 31 and a fourth external electrode 34 , and an electrode wiring H2 for directly connecting the second external electrode 32 and the third external electrode 33 .

[0155] Furthermore, an insulating layer 70 is provided below the magnetic layer group G11. The insulating layer 70 is as described in the second embodiment.

[0156] The laminated coil of this embodiment includes conductor wiring H1 that directly connects the second lead conductor 42 and the third lead conductor 43, and electrode wiring H2 that directly connects the second external electrode 32 and the third external electrode 33. By using both conductor wiring H1 and electrode wiring H2, the second external electrode 32 and the third external electrode 33 can be electrically connected with lower resistance, thus reducing the possibility of unintended voltages being generated in the laminated coil, causing short circuits between coils within the base body 10 and degrading the electrical characteristics of the inductor.

[0157] As a preferred aspect of this embodiment, the width of the conductor wiring H1 connecting the second lead conductor 42 and the third lead conductor 43 can be narrower than the width of the electrode wiring connecting the second external electrode 32 and the third external electrode 33. In other words, the planar area of ​​the conductor wiring H1, when viewed from above, is smaller than the planar area of ​​the electrode wiring H2. By making the width (or planar area) of the conductor wiring H1 smaller, the volume reduction of the magnetic grains in the magnetic layer S, when viewed from above, can be reduced. Consequently, the impact on the inductance value can be minimized.

[0158] <Description of the stacked coil array>

[0159] Next, refer to Figure 12A 1 to 3 will describe the laminated coil array of the present disclosure. Figure 12A 、 12B 12C are perspective views schematically showing an example of the internal structure of the laminated coil array of the present disclosure.

[0160] The stacked coil array 100 of the present disclosure may include a third coil and a fourth coil inside the blank 10 in addition to the first coil 21 and the second coil 22 described in the above-mentioned stacked coil. In addition, the third coil has substantially the same structure as the first coil 21, and the fourth coil has substantially the same structure as the second coil 22. In other words, the second coil is arranged at a position farther from the bottom surface of the blank 10 than the first coil in the stacking direction, and the fourth coil is arranged at a position farther from the bottom surface of the blank 10 than the third coil in the stacking direction. In addition, the third coil and the fourth coil are arranged adjacent to the first coil 21 and the second coil 22. In other words, the third coil and the fourth coil are arranged in a direction perpendicular to the stacking direction of the stacked coil relative to the first coil 21 and the second coil 22.

[0161] The stacked coil array 100 of the present disclosure may include a fifth external electrode 35 and a sixth external electrode 36 electrically connected to the third coil. Furthermore, the end of the third coil conductor layer closest to the bottom surface of the third coil may be connected to the fifth external electrode 35 via a fifth lead conductor 45. Furthermore, the other end of the third coil conductor layer may be connected to the sixth external electrode 36 via a sixth lead conductor 46.

[0162] The stacked coil array 100 of the present disclosure may include a seventh external electrode 37 and an eighth external electrode 38 electrically connected to the fourth coil. The fourth coil may be positioned farther from the bottom surface of the base body 10 than the third coil in the stacking direction. Furthermore, the end of the fourth coil conductor layer closest to the bottom surface of the fourth coil is connected to the seventh external electrode 37 via a seventh lead conductor 47. Furthermore, the other end of the fourth coil conductor is connected to the eighth external electrode 38 via an eighth lead conductor 48.

[0163] Here, as a characteristic feature of the stacked coil array 100 disclosed herein, the second external electrode 32 and the third external electrode 33 can be electrically connected, and the sixth external electrode 36 and the seventh external electrode 37 can be electrically connected. For example, in the stacked coil array shown in FIG12 , the second external electrode 32 and the third external electrode 33 are directly connected via the conductor wiring H1, and the sixth external electrode 36 and the seventh external electrode 37 are directly connected via the conductor wiring H1. This prevents short circuits between the first coil 21 and the second coil 22 and / or between the third coil and the fourth coil.

[0164] As an example Figure 12B In the illustrated stacked coil array 100, the third external electrode 33 is directly connected to the sixth external electrode 36. In the illustrated example, the third external electrode 33 and the sixth external electrode 36 are directly connected via electrode wiring H2. This configuration not only prevents short circuits between the first coil 21 and the second coil 22 in their immediate vicinity, but also prevents short circuits between the first coil and the third coil (or fourth coil), and between the second coil and the third coil (or fourth coil).

[0165] As an example Figure 12C In the illustrated stacked coil array 100, the third lead conductor 43 is directly connected to the sixth lead conductor 46. In the illustrated example, the third lead conductor 43 and the sixth lead conductor 46 are directly connected via conductor wiring H1. Even with this configuration, in addition to preventing short circuits between the first coil 21 and the second coil 22, short circuits between the first coil and the third coil (or the fourth coil) and between the second coil and the third coil (or the fourth coil) can also be prevented.

[0166] Figure 12AThe stacked coil array 100 shown in Figures 1 to 2C illustrates a configuration in which six coils are disposed within a base body. However, the stacked coil array 100 is not limited to this example and may include four coils disposed within a single base body, or may include four or more coils disposed within a single base body. By disposing multiple coils within a base body, the stacked coil array 100 can be used for high-current applications, and the array configuration can reduce the mounting area and / or mounting costs.

[0167] Furthermore, all aspects of the disclosed embodiments are illustrative and should not be construed as limiting. For example, the second lead conductor and the third external electrode may be connected. Therefore, the technical scope of the present disclosure is not defined solely by the aforementioned embodiments but is instead defined by the claims. Furthermore, the technical scope of the present disclosure encompasses all equivalents to the claims and all modifications within the scope thereof.

[0168] The aspects of the laminated coil and the laminated coil array disclosed herein are as follows.

[0169] <1> A laminated coil comprising:

[0170] a green body, laminated with a magnetic layer;

[0171] A first coil and a second coil are provided inside the blank, the first coil including a plurality of first coil conductor layers in a stacking direction, and the second coil including a plurality of second coil conductor layers in the stacking direction;

[0172] A first external electrode and a second external electrode are electrically connected to the first coil;

[0173] a third external electrode and a fourth external electrode electrically connected to the second coil;

[0174] The first to fourth external electrodes are arranged on the bottom surface of the green body.

[0175] The second coil is provided at a position farther from the bottom surface of the base body than the first coil in the stacking direction.

[0176] The laminated coil includes:

[0177] a first lead conductor provided inside the base body and connecting an end portion of the first coil conductor layer closest to the bottom surface among the ends of the first coil to the first external electrode;

[0178] A second lead conductor is provided inside the green body and connects the other end of the first coil to the second external electrode;

[0179] a third lead conductor provided inside the base body and connecting an end portion of the second coil conductor layer closest to the bottom surface among the ends of the second coil to the third external electrode; and

[0180] The fourth lead conductor is provided inside the base body and connects the other end of the second coil to the fourth external electrode.

[0181] The second external electrode is electrically connected to the third external electrode.

[0182] <2> The laminated coil according to <1>, wherein

[0183] The second lead conductor and the third lead conductor are directly connected via a conductor wiring.

[0184] <3> The laminated coil according to <1> or <2>, wherein:

[0185] The second external electrode and the third external electrode are directly connected via an electrode wiring.

[0186] <4> The laminated coil according to <1>, comprising:

[0187] Conductor wiring directly connects the second lead conductor and the third lead conductor; and

[0188] The electrode wiring directly connects the second external electrode and the third external electrode.

[0189] <5> The laminated coil according to any one of <1> to <4>, wherein

[0190] A conductor wiring connecting the second lead conductor and the third lead conductor has a width narrower than a width of an electrode wiring connecting the second external electrode and the third external electrode.

[0191] <6> A stacked coil array comprising:

[0192] a green body, laminated with a magnetic layer;

[0193] a first coil, a second coil, a third coil, and a fourth coil, disposed inside the blank, the first coil including a plurality of first coil conductor layers in a stacking direction, the second coil including a plurality of second coil conductor layers in the stacking direction, the third coil including a plurality of third coil conductor layers in the stacking direction, and the fourth coil including a plurality of fourth coil conductor layers in the stacking direction;

[0194] A first external electrode and a second external electrode are electrically connected to the first coil;

[0195] a third external electrode and a fourth external electrode electrically connected to the second coil;

[0196] a fifth external electrode and a sixth external electrode electrically connected to the third coil; and

[0197] The seventh external electrode and the eighth external electrode are electrically connected to the fourth coil.

[0198] The first to eighth external electrodes are arranged on the bottom surface of the green body.

[0199] The second coil is provided at a position farther from the bottom surface of the base body than the first coil in the stacking direction.

[0200] The fourth coil is provided at a position farther from the bottom surface of the base body than the third coil in the stacking direction.

[0201] The stacked coil array includes:

[0202] a first lead conductor provided inside the base body and connecting an end portion of the first coil conductor layer closest to the bottom surface among the ends of the first coil to the first external electrode;

[0203] A second lead conductor is provided inside the green body and connects the other end of the first coil to the second external electrode;

[0204] a third lead conductor provided inside the green body and connecting an end portion of the second coil conductor layer closest to the bottom surface among the ends of the second coil to the third external electrode;

[0205] a fourth lead conductor disposed inside the green body and connecting the other end of the second coil to the fourth external electrode;

[0206] a fifth lead conductor provided inside the green body and connecting an end portion of the third coil conductor layer closest to the bottom surface among the end portions of the third coil to the fifth external electrode;

[0207] a sixth lead conductor disposed inside the green body and connecting the other end of the third coil to the sixth external electrode;

[0208] a seventh lead conductor provided inside the base body and connecting an end portion of the fourth coil conductor layer closest to the bottom surface among the end portions of the fourth coil to the seventh external electrode; and

[0209] The eighth lead conductor is provided inside the base body and connects the other end of the fourth coil to the eighth external electrode.

[0210] The second external electrode is electrically connected to the third external electrode.

[0211] The sixth external electrode is electrically connected to the seventh external electrode.

[0212] <7> The laminated coil array according to <6>, wherein:

[0213] The third external electrode is directly connected to the sixth external electrode.

[0214] <8> The laminated coil array according to <6> or <7>, wherein:

[0215] The third lead conductor is directly connected to the sixth lead conductor.

[0216] Industrial applicability

[0217] The laminated coil and laminated coil array disclosed herein can be suitably used as an electronic component capable of reducing degradation in electrical characteristics.

[0218] Description of Reference Numerals

[0219] 1. Stacked coil; 10. Green body; 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. First coil; 22. Second coil; 31. First external electrode; 32. Second external electrode; 33. Third external electrode; 34. Fourth external electrode; 35. Fifth external electrode; 36. Sixth external electrode; 37. Seventh external electrode; 38. Eighth external electrode; 41. First lead conductor; 42. Second lead conductor; 43. Third lead conductor; 44. Fourth lead conductor; 45. Fifth lead conductor; 46. Sixth lead conductor; 47. Seventh lead conductor; 48. Eighth lead conductor; 51. First coil conductor layer; 52. Second coil conductor layer; 60. Avoidance portion; 65. Straight portion; 70. Insulating layer; 100. Stacked coil array; G1-G11 magnetic layer groups; H1. Conductor wiring; H2. Electrode wiring; L1-L4 width dimensions; M. Conductive component; S. Magnetic layer.

Claims

1. A laminated coil comprising: a green body, laminated with a magnetic layer; A first coil and a second coil are provided inside the blank, the first coil including a plurality of first coil conductor layers in a stacking direction, and the second coil including a plurality of second coil conductor layers in the stacking direction; A first external electrode and a second external electrode are electrically connected to the first coil; a third external electrode and a fourth external electrode electrically connected to the second coil; 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 base body. The second coil is provided at a position farther from the bottom surface of the base body than the first coil in the stacking direction. The laminated coil includes: a first lead conductor provided inside the base body and connecting an end portion of the first coil conductor layer closest to the bottom surface among the ends of the first coil to the first external electrode; A second lead conductor is provided inside the green body and connects the other end of the first coil to the second external electrode; a third lead conductor provided inside the base body and connecting an end portion of the second coil conductor layer closest to the bottom surface among the ends of the second coil to the third external electrode; and The fourth lead conductor is provided inside the base body and connects the other end of the second coil to the fourth external electrode. The second external electrode is electrically connected to the third external electrode.

2. The laminated coil according to claim 1, wherein The second lead conductor and the third lead conductor are directly connected via a conductor wiring.

3. The laminated coil according to claim 1 or 2, wherein: The second external electrode and the third external electrode are directly connected via an electrode wiring.

4. The laminated coil according to claim 1, wherein have: Conductor wiring directly connects the second lead conductor and the third lead conductor; and The electrode wiring directly connects the second external electrode and the third external electrode.

5. The laminated coil according to claim 4, wherein A conductor wiring connecting the second lead conductor and the third lead conductor has a width narrower than a width of an electrode wiring connecting the second external electrode and the third external electrode.

6. A stacked coil array comprising: a green body, laminated with a magnetic layer; a first coil, a second coil, a third coil, and a fourth coil, disposed inside the blank, the first coil including a plurality of first coil conductor layers in a stacking direction, the second coil including a plurality of second coil conductor layers in the stacking direction, the third coil including a plurality of third coil conductor layers in the stacking direction, and the fourth coil including a plurality of fourth coil conductor layers in the stacking direction; A first external electrode and a second external electrode are electrically connected to the first coil; a third external electrode and a fourth external electrode electrically connected to the second coil; a fifth external electrode and a sixth external electrode, electrically connected to the third coil; as well as The seventh external electrode and the eighth external electrode are electrically connected to the fourth coil. The first external electrode, the second external electrode, the third external electrode, the fourth external electrode, the fifth external electrode, the sixth external electrode, the seventh external electrode, and the eighth external electrode are arranged on the bottom surface of the base body. The second coil is provided at a position farther from the bottom surface of the base body than the first coil in the stacking direction. The fourth coil is provided at a position farther from the bottom surface of the base body than the third coil in the stacking direction. The stacked coil array includes: a first lead conductor provided inside the base body and connecting an end portion of the first coil conductor layer closest to the bottom surface among the ends of the first coil to the first external electrode; A second lead conductor is provided inside the green body and connects the other end of the first coil to the second external electrode; a third lead conductor provided inside the green body and connecting an end portion of the second coil conductor layer closest to the bottom surface among the ends of the second coil to the third external electrode; a fourth lead conductor disposed inside the green body and connecting the other end of the second coil to the fourth external electrode; a fifth lead conductor provided inside the green body and connecting an end portion of the third coil conductor layer closest to the bottom surface among the end portions of the third coil to the fifth external electrode; a sixth lead conductor disposed inside the green body and connecting the other end of the third coil to the sixth external electrode; a seventh lead conductor provided inside the base body and connecting an end portion of the fourth coil conductor layer closest to the bottom surface among the end portions of the fourth coil to the seventh external electrode; and The eighth lead conductor is provided inside the base body and connects the other end of the fourth coil to the eighth external electrode. The second external electrode is electrically connected to the third external electrode. The sixth external electrode is electrically connected to the seventh external electrode.

7. The stacked coil array according to claim 6, wherein: The third external electrode is directly connected to the sixth external electrode.

8. The stacked coil array according to claim 6 or 7, wherein: The third lead conductor is directly connected to the sixth lead conductor.

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