公开(公告)号：US20250104898A1

公开(公告)日：2025-03-27

申请号：US18891123

申请日：2024-09-20

Applicant: TDK Corporation

Inventor： Akira MOTOHASHI ,  Naoaki FUJII ,  Tomonaga NISHIKAWA ,  Hiroki NAKAGOMI ,  Takuya TAKEUCHI

IPC: H01F17/04 ,  H01F5/04 ,  H01F5/06

Abstract: Disclosed herein is a coil component that includes plural conductor layers embedded in the magnetic element body. Each of the conductor layers includes a coil pattern, and first and second connection patterns exposed from the magnetic element body. The conductor layers includes a first conductor layer positioned at one end portion in the stacking direction, a second conductor layer positioned at the other end portion in the stacking direction, and one or more third conductor layers positioned between the first and second conductor layers. In the second conductor layer, an outer peripheral end of the coil pattern is connected to the second connection pattern through a lead-out pattern. In at least one of the first to third conductor layers, the magnetic element body is disposed in a separation area overlapping the lead-out pattern in the stacking direction.

公开(公告)号：US20230368969A1

公开(公告)日：2023-11-16

申请号：US18044872

申请日：2021-09-07

Applicant: TDK Corporation

Inventor： Yuuichi KAWAGUCHI ,  Naoaki FUJII ,  Tomonaga NISHIKAWA

IPC: H01F27/32 ,  H01F27/28 ,  H01F27/29

CPC classification number: H01F27/323 ,  H01F27/2804 ,  H01F27/292 ,  H01F2027/2809

Abstract: To prevent a short-circuit failure by controlling the flow of a solder in a surface-mount type coil component. A coil component includes a coil part in which conductor layers and interlayer insulating layers are alternately stacked. The conductor layers respectively have coil conductor patterns embedded in the coil part and electrode patterns exposed from the coil part. The interlayer insulating layers each protrude from the plurality of electrode patterns at a part between the electrode patterns, and the flow of a solder in the stacking direction is suppressed by the protruding parts. This makes it possible to prevent a short-circuit failure due to the flow of a solder in the stacking direction.

公开(公告)号：US20190035534A1

公开(公告)日：2019-01-31

申请号：US16046586

申请日：2018-07-26

Applicant: TDK CORPORATION

Inventor： Masanori SUZUKI ,  Kouji KAWAMURA ,  Naoaki FUJII ,  Manabu YAMATANI ,  Tomonaga NISHIKAWA

IPC: H01F27/28 ,  H01F27/32 ,  H01F41/04 ,  H01F41/12

Abstract: A coil component includes a plurality of conductor layers constituted of a first conductor layer to a fourth conductor layer that includes a function layer and a coil layer wound around an axis center; and a covering portion that is formed of an insulative resin, integrally covers the plurality of conductor layers, and is interposed between conductor layers adjacent to each other. The coil layer and the function layer of the plurality of conductor layers have substantially the same shape in a plan view. The fourth conductor layer has a connection conductor layer connecting the coil layer and the function layer to each other. A conductor layer having no connection conductor layer among the plurality of conductor layers has a protrusion portion corresponding to the connection conductor layer at a position overlapping the connection conductor layer in a plan view.

公开(公告)号：US20240186056A1

公开(公告)日：2024-06-06

申请号：US18525613

申请日：2023-11-30

Applicant: TDK Corporation

Inventor： Yuuichi KAWAGUCHI ,  Kazuhiro YOSHIKAWA ,  Tomonaga NISHIKAWA ,  Naoaki FUJII ,  Liyi CHEN

IPC: H01F27/28 ,  H01F27/32 ,  H01F41/04 ,  H01F41/12

CPC classification number: H01F27/2804 ,  H01F27/324 ,  H01F41/043 ,  H01F41/12

Abstract: Disclosed herein is a coil component that includes a magnetic element body, a coil pattern and a conductor post embedded in the magnetic element body, a post protective film provided between the conductor post and the magnetic element body, a cover insulating film covering a mounting surface of the magnetic element body, and a terminal electrode provided on the cover insulating film and connected to the conductor post through a first opening formed in the cover insulating film. The terminal electrode includes: a first conductor layer contacting the conductor post through the first opening and having a second opening through which a part of the conductor post is exposed; and a second conductor layer having a resistance value lower than the first conductive material, covering the first conductor layer, and contacting the part of the conductor post through the second opening.

公开(公告)号：US20230126614A1

公开(公告)日：2023-04-27

申请号：US17971177

申请日：2022-10-21

Applicant: TDK Corporation

Inventor： Masanori SUZUKI ,  Takuya TAKEUCHI ,  Tomonaga NISHIKAWA ,  Nobuya TAKAHASHI ,  Naoaki FUJII

IPC: H01F27/32 ,  H01F27/29 ,  H01F41/12

Abstract: Disclosed herein is a coil component that includes a coil part having a structure in which a plurality of conductor layers each having a coil pattern are stacked in a coil axis direction through a plurality of interlayer insulating films, a first magnetic layer covering the coil part in the coil axis direction, and a second magnetic layer positioned in an inner diameter area of the coil part. The plurality of interlayer insulating films include a first interlayer insulating film positioned closest to the first magnetic layer. The first and second magnetic layers contact each other through an opening formed in the first interlayer insulating film. The opening has a shape whose diameter increases as a distance from an interface between the first and second magnetic layers increases.

公开(公告)号：US20180323003A1

公开(公告)日：2018-11-08

申请号：US15961101

申请日：2018-04-24

Applicant: TDK CORPORATION

Inventor： Naoaki FUJII ,  Tomonaga NISHIKAWA ,  Kouji KAWAMURA ,  Nobuya TAKAHASHI

IPC: H01F27/29 ,  H01F27/28 ,  H01F27/32

CPC classification number: H01F27/292 ,  H01F27/2804 ,  H01F27/323 ,  H01F2027/2809

Abstract: Disclosed herein is a coil component that includes a coil part in which a plurality of conductor layers and a plurality of interlayer insulting layers are alternately laminated, and an external terminal. Each of the conductor layers has a coil conductor pattern and an electrode pattern exposed from the coil part. The electrode patterns are connected to each other through a plurality of via conductors penetrating the interlayer insulating layers. At least one of the interlayer insulating layers is exposed from the coil part positioned between the plurality of electrode patterns. The external terminal is formed on the electrode patterns exposed from the coil part so as to avoid an exposed part of the interlayer insulating layer.

公开(公告)号：US20220375679A1

公开(公告)日：2022-11-24

申请号：US17767226

申请日：2020-09-29

Applicant: TDK Corporation

Inventor： Takuya TAKEUCHI ,  Naoaki FUJII ,  Nobuya TAKAHASHI

IPC: H01F27/29 ,  H01F17/00 ,  H01F27/32 ,  H01F41/04

Abstract: To improve magnetic characteristics of a coil component having a structure in which an interlayer insulating film is provided between a spiral coil pattern and a magnetic element body. A coil component 1 includes: an interlayer insulating film 41 covering coil patterns CP1 to CP3 from one side in the axial direction of the coil patterns; a magnetic element body M1 filled in the inner diameter areas of the coil patterns CP1 to CP3; and a magnetic element body M2 covering the coil patterns CP1 to CP3 from the one side in the axial direction through the interlayer insulating film 41. The interlayer insulating film 41 has a protruding part 41A radially protruding to the inner diameter area, and the protruding part 41A is curved to the other side in the axial direction. Since the protruding part 41A is curved in the axial direction, the entrance of a magnetic path passing through the inner diameter area is made wider than when the protruding part 41A linearly protrudes to the inner diameter area. This suppresses deterioration in magnetic characteristics due to the presence of the protruding part 41A.

公开(公告)号：US20210005377A1

公开(公告)日：2021-01-07

申请号：US16642773

申请日：2018-08-10

Applicant: TDK Corporation

Inventor： Masanori SUZUKI ,  Yuuichi KAWAGUCHI ,  Naoaki FUJII ,  Tomonaga NISHIKAWA

IPC: H01F27/28 ,  H01F27/24 ,  H01F27/32 ,  H01F41/04 ,  H01F41/12

Abstract: A coil component includes: a first magnetic resin layer in a lower area; a second magnetic resin layer in an inner diameter area surrounded by a coil pattern, an outer peripheral area that surrounds the coil pattern, and an upper area; and an insulating gap layer between the first and second magnetic resin layers. A part of the insulating gap layer positioned between the first magnetic resin layer and a part of the second magnetic resin layer positioned in the inner diameter area is curved in the axial direction. A magnetic substrate need not be used. The insulating gap layer is provided, allowing the insulating gap layer to function as a magnetic gap. The insulating gap layer is curved in the axial direction, so that a contact area between the insulating gap layer and the first and second magnetic resin layers are increased to enhance adhesion therebetween.

公开(公告)号：US20190088413A1

公开(公告)日：2019-03-21

申请号：US16126351

申请日：2018-09-10

Applicant: TDK CORPORATION

Inventor： Yuuichi KAWAGUCHI ,  Masanori SUZUKI ,  Naoaki FUJII

IPC: H01F41/02 ,  H01F27/28 ,  H01F27/24 ,  H01F27/29 ,  H01F41/04 ,  H01F41/12 ,  H01F27/32

Abstract: Provided is a coil component that includes a coil part having a planar coil that includes a winding section and an insulating section covering the winding section, and a magnetic resin layer including a magnetic filler and configured to cover the coil part. The magnetic resin layer has a first magnetic resin layer that is in contact with the coil part and a second magnetic resin layer that is laminated on the first magnetic resin layer. The second magnetic resin layer constitutes a principal surface of the magnetic resin layer, and a maximum particle size of the magnetic filler contained in the second magnetic resin layer is larger than that of the magnetic filler contained in the first magnetic resin layer.

公开(公告)号：US20240087787A1

公开(公告)日：2024-03-14

申请号：US18463649

申请日：2023-09-08

Applicant: TDK Corporation

Inventor： Yuki HASHIMOTO ,  Toshiyuki ABE ,  Takeshi OKUMURA ,  Tomonaga NISHIKAWA ,  Naoaki FUJII ,  Kazuhiro YOSHIKAWA

IPC: H01F17/00 ,  H01F17/04 ,  H01F27/02

CPC classification number: H01F17/0013 ,  H01F17/04 ,  H01F27/022 ,  H01F27/292

Abstract: Disclosed herein is a coil component that includes a coil part embedded in a magnetic element body. The coil part has a structure in which plural interlayer insulating films and plural conductor layers having a coil pattern are alternately stacked. At least one of the conductor layers has a clearance area having no coil pattern and extending radially outward from a center axis of the coil part. The magnetic element body includes a first magnetic resin layer provided in an inner diameter area of the coil part, a second magnetic resin layer provided in a radially outside area of the coil part, and a fifth magnetic resin layer filled in the clearance area and contacting the first and second magnetic resin layers.