公开(公告)号：US20180322998A1

公开(公告)日：2018-11-08

申请号：US15968036

申请日：2018-05-01

Applicant: TDK CORPORATION

Inventor： Yasuhide YAMASHITA ,  Katsushi YASUHARA ,  Chiomi SATO ,  Syota GOTO

IPC: H01F27/255 ,  B29C43/18 ,  H01F27/02 ,  H01F41/04

CPC classification number: H01F27/255 ,  B29C43/18 ,  H01F1/36 ,  H01F27/02 ,  H01F41/04 ,  H01F2017/046 ,  H01F2017/048

Abstract: An inductor element includes a wire-winding portion and a core portion. In the wire-winding portion, a conductor is wound in a coil shape. The core portion surrounds the wire-winding portion and contains a magnetic powder and a resin. An inner-core central region is a region of the core portion within a distance from a winding axis center of the wire-winding portion toward an existing region of the wire-winding portion in an outward direction perpendicular to the winding axis center. A top-plate central region is a region of the core portion within a distance from the winding axis center toward a no-existing region of the wire-winding portion in the outward direction. Sα−Sβ≥−2% is satisfied, where Sα (%) and sβ (%) are respectively an area ratio of the magnetic powder in the inner-core central region and the top-plate central region.

公开(公告)号：US20230352231A1

公开(公告)日：2023-11-02

申请号：US18307442

申请日：2023-04-26

Applicant: TDK CORPORATION

Inventor： Katsushi YASUHARA ,  Yuji SEZAI ,  Ryoma NAKAZAWA ,  Hironobu FURUKAWA

IPC: H01F27/28 ,  H01F41/02

CPC classification number: H01F27/2823 ,  H01F41/0246 ,  H01F27/255

Abstract: A coil component including a core part and a coil part formed by winding a conductor in a coil form, in which the coil part is inside of the core part. The core part has a center pole part positioned in an area surrounded by an inner diameter of the coil part. The center pole part includes a first center pole part and a second center pole part each having different predetermined configurations, or the center pole part includes soft magnetic metal particles having predetermined deflection angles and aspect ratios.

公开(公告)号：US20180096781A1

公开(公告)日：2018-04-05

申请号：US15698163

申请日：2017-09-07

Applicant: TDK CORPORATION

Inventor： Yuji SEZAI ,  Katsushi YASUHARA

IPC: H01F27/30 ,  H01F17/02

CPC classification number: H01F27/306 ,  H01F17/02 ,  H01F17/04 ,  H01F27/28 ,  H01F27/2823 ,  H01F27/29 ,  H01F2017/048

Abstract: A coil device, in which an air-core coil of a cylindrical shape is buried in a core including a magnetic powder and a resin, showing, CV value of the below described cross sectional areas, SA1 to SA5, 0.55 or less, when an outer diameter of the air-core coil is “a1”, an inner diameter of the same is “a2”, and a distance between a surface of the core perpendicular to a direction of winding axis and an end of the air-core coil in the direction of winding axis is “h”, is provided. The coil device is superior in DC superimposing characteristic while suppressing the magnetic saturation.

公开(公告)号：US20250111982A1

公开(公告)日：2025-04-03

申请号：US18899985

申请日：2024-09-27

Applicant: TDK CORPORATION

Inventor： Katsushi YASUHARA ,  Ryoma NAKAZAWA ,  Yuji SEZAI ,  Sena YOSHINO

IPC: H01F27/255 ,  H01F27/28

Abstract: A coil component may include a core portion including a soft magnetic metal material and a winding portion including a conductor wound. The winding portion may be inside the core portion. The core portion may include a central portion and an outer portion. The central portion may be disposed in an inside diameter portion of the winding portion. The outer portion may be disposed in a portion other than the central portion. The central portion may include a first central portion and a second central portion including different materials. The second central portion may be disposed around the first central portion. H, S, and S1 may be within specific ranges, where H denotes a height of the winding portion, S denotes a sectional area of the central portion, and S1 denotes a sectional area of the first central portion.

公开(公告)号：US20180322997A1

公开(公告)日：2018-11-08

申请号：US15967769

申请日：2018-05-01

Applicant: TDK CORPORATION

Inventor： Yasuhide YAMASHITA ,  Katsushi YASUHARA ,  Chiomi SATO

IPC: H01F27/255 ,  H01F27/28

CPC classification number: H01F27/255 ,  H01F27/02 ,  H01F27/2823

Abstract: An inductor element includes a wire-winding portion and a core portion. In the wire-winding portion, a conductor is wound in a coil shape. The core portion surrounds the wire-winding portion and contains a magnetic powder and a resin. The wire-winding portion includes an inner circumferential surface. A winding-wire inner circumferential neighboring region is a region of the core portion within a distance from the inner circumferential surface toward a winding axis of the wire-winding portion. An inner-core central region is a region of the core portion within a distance from the winding axis center toward an existing region of the wire-winding portion in an outward direction perpendicular to the winding axis center. Sα−Sβ1≥5.0% is satisfied, where Sα(%) and Sβ1 (%) are respectively an area ratio of a magnetic powder in the inner-core central region and the winding-wire inner circumferential neighboring region.

公开(公告)号：US20180019043A1

公开(公告)日：2018-01-18

申请号：US15643956

申请日：2017-07-07

Applicant: TDK CORPORATION

Inventor： Koji MIURA ,  Ryoma NAKAZAWA ,  Katsushi YASUHARA ,  Tomohisa MITOSE

IPC: H01F1/147 ,  C22C38/10 ,  B22F9/08 ,  H01F3/08 ,  C22C38/02

CPC classification number: H01F1/14766 ,  B22F9/082 ,  B22F2001/0066 ,  B22F2301/35 ,  B22F2304/10 ,  B22F2998/10 ,  C22C1/05 ,  C22C33/0264 ,  C22C33/0285 ,  C22C38/02 ,  C22C38/10 ,  C22C2202/02 ,  H01F3/08 ,  B22F2003/023

Abstract: A soft magnetic metal powder includes a plurality of soft magnetic metal particles composed of an Fe—Co based alloy. The Fe—Co based alloy includes 0.50 mass % or more and 8.00 mass % or less of Co and a remaining part composed of Fe and an inevitable impurity. A soft magnetic metal powder includes a plurality of soft magnetic metal particles composed of an Fe—Co based alloy. The Fe—Co based alloy includes 0.50 mass % or more and 8.00 mass % or less of Co, 0.01 mass % or more and 8.00 mass % or less of Si, and a remaining part composed of Fe and an inevitable impurity. The present invention can provide a soft magnetic metal powder or so having a favorable corrosion resistance.

公开(公告)号：US20240282509A1

公开(公告)日：2024-08-22

申请号：US18583137

申请日：2024-02-21

Applicant: TDK CORPORATION

Inventor： Kazunori ARIMITSU ,  Kiichi FUJISAWA ,  Masashi HAMA ,  Nobuo KITAJIMA ,  Makoto TAKAHASHI ,  Katsushi YASUHARA ,  Hironobu FURUKAWA ,  Ryuya KON

IPC: H01F27/29 ,  H01F27/24

CPC classification number: H01F27/292 ,  H01F27/24

Abstract: A coil device has a wound portion, a leadout portion led out from the wound portion in a first direction, and an element body covering the wound portion and the leadout portion. A winding axis of the wound portion is perpendicular to a mounting facing surface of the element body and is displaced to a second direction opposite to the first direction with respect to a center of the element body. An outer circumferential surface of the wound portion is distorted so as to bulge outward in the first direction from the outer circumferential surface of the wound portion.

公开(公告)号：US20230047154A1

公开(公告)日：2023-02-16

申请号：US17879862

申请日：2022-08-03

Applicant: TDK CORPORATION

Inventor： Katsushi YASUHARA ,  Ryoma NAKAZAWA ,  Yusuke TANIGUCHI ,  Hiroyuki ONO

IPC: H01F1/147 ,  C22C38/02 ,  H01F5/00 ,  H01F1/20

Abstract: A soft magnetic alloy powder contains soft magnetic alloy particles. The soft magnetic alloy particles contain Fe and Si. The soft magnetic alloy particles each include crystal grains and crystal grain boundary between the crystal grains. At least one of the crystal grains has a Si segregation part.

公开(公告)号：US20180204661A1

公开(公告)日：2018-07-19

申请号：US15848567

申请日：2017-12-20

Applicant: TDK CORPORATION

Inventor： Yasuhide YAMASHITA ,  Katsushi YASUHARA ,  Chiomi SATO

IPC: H01F27/255 ,  B29C43/18 ,  H01F27/02 ,  H01F41/04

CPC classification number: H01F27/255 ,  B29C43/14 ,  B29C43/18 ,  B29C2043/182 ,  B29K2101/10 ,  B29K2505/00 ,  B29K2705/00 ,  B29K2995/0008 ,  H01F1/36 ,  H01F3/08 ,  H01F3/14 ,  H01F17/043 ,  H01F27/02 ,  H01F41/0246 ,  H01F41/04 ,  H01F2017/046 ,  H01F2017/048

Abstract: A method of manufacturing an inductor element includes preparing an insert member including a winding portion where a conductor is wound in a coil shape. A plurality of preliminary green compacts is obtained by conducting a preliminary compression molding of a granule containing a magnetic powder and a resin at a pressure of 2.5×102 to 1×103 MPa. The insert member and the plurality of preliminary green compacts are integrated so that a joint interface of the plurality of preliminary green compacts is formed intermittently.