公开(公告)号：US20200303105A1

公开(公告)日：2020-09-24

申请号：US16823394

申请日：2020-03-19

Applicant: TDK CORPORATION

Inventor： Nobuhiro OKUDA ,  Hiroyuki MATSUMOTO ,  Kazuhiro YOSHIDOME

IPC: H01F1/20 ,  H01F3/08

Abstract: The present invention relates to a magnetic core containing soft magnetic powder and a coil component using the magnetic core. The soft magnetic powder has particles each having at least one pore therein, and the number of pores present in a region of 2.5 mm square in a cross section of the magnetic core is 60×(η/80) or more and 10000×(η/80) or less, in which the volume packing density of the soft magnetic powder in the magnetic core is η%.

公开(公告)号：US20210134513A1

公开(公告)日：2021-05-06

申请号：US17082389

申请日：2020-10-28

Applicant: TDK CORPORATION

Inventor： Nobuhiro OKUDA ,  Hiroyuki MATSUMOTO ,  Kazuhiro YOSHIDOME

IPC: H01F27/255 ,  H01F1/153

Abstract: A magnetic core having a high relative permeability is obtained. The magnetic core contains soft magnetic metal powder particles. In a cross section of the magnetic core, a number ratio of soft magnetic metal powder particles having a circularity of less than 0.50 to a total number of soft magnetic metal powder particles having a particle size of 10 μm or more and less than 50 μm is 0.05% or more and 1.50% or less.

公开(公告)号：US20240177898A1

公开(公告)日：2024-05-30

申请号：US18284139

申请日：2022-02-25

Applicant: TDK CORPORATION

Inventor： Nobuhiro OKUDA ,  Hiroyuki MATSUMOTO ,  Kazuhiro YOSHIDOME

IPC: H01F1/147 ,  H01F1/20 ,  H01F3/08

CPC classification number: H01F1/147 ,  H01F1/20 ,  H01F3/08

Abstract: A soft magnetic powder includes Fe and Co. The total content of Fe and Co with respect to the soft magnetic powder overall is 90 mass % or greater. The Fe content with respect to the total content of Fe and Co is 30-95 mass %. The average particle diameter of the soft magnetic powder is 0.10-5.0 μm. The amount of oxygen on the surface of the soft magnetic powder is 0.010 g/m2 or less. The true density of the soft magnetic powder with respect to the theoretical density of the soft magnetic powder is 90-99%.

公开(公告)号：US20230268107A1

公开(公告)日：2023-08-24

申请号：US18169297

申请日：2023-02-15

Applicant: TDK CORPORATION

Inventor： Seigo TOKORO ,  Kazuhiro YOSHIDOME ,  Akito HASEGAWA ,  Nobuhiro OKUDA

IPC: H01F3/08 ,  H01F1/33 ,  H01F1/20

CPC classification number: H01F3/08 ,  H01F1/33 ,  H01F1/20

Abstract: A magnetic core, containing metal magnetic powder and resin, in which a content of the metal magnetic powder satisfies 60%≤(A1/A2)≤90%. The metal magnetic powder includes small particles having the Heywood diameter of 1 μm or less in the cross section of the magnetic core and large particles having the Heywood diameter of 5 μm or more and less than 40 μm. An edge-to-edge distance regarding to a distance between the small particles satisfies 5≤((L1av/dav)×100)≤70. An edge-to-edge distance regarding to a distance between the small particles and the large particles satisfies 0.02 μm≤L2av≤0.13 μm and σ≤0.25 μm.