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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12103081 B1

PDFFull Text
Date of Patent:
Oct. 01, 2024

Filed:

Nov. 08, 2022

Dust core, method for manufacturing dust core, inductor including dust core, and electronic/electric device including inductor

Applicant:

Alps Alpine Co., Ltd., Tokyo, JP;

Inventors:

Kinshiro Takadate, Niigata-ken, JP;

Hisato Koshiba, Niigata-ken, JP;

Shokan Yamashita, Niigata-ken, JP;

Assignee:

Alps Alpine Co., Ltd., Tokyo, JP;

Attorney:

Beyer Law Group LLP

Primary Examiner:

Sally A Merkling

Assistant Examiner:

Sean P O'Keefe

Int. Cl.
CPC ...
H01F 3/08 (2006.01); B22F 1/00 (2022.01); B22F 1/052 (2022.01); B22F 1/06 (2022.01); B22F 1/08 (2022.01); B22F 1/102 (2022.01); B22F 3/00 (2021.01); B22F 3/02 (2006.01); C22C 45/02 (2006.01); H01F 1/153 (2006.01); H01F 1/22 (2006.01); H01F 1/26 (2006.01); H01F 17/06 (2006.01); H01F 41/02 (2006.01);
U.S. Cl.
CPC ...
B22F 3/00 (2013.01); B22F 1/00 (2013.01); B22F 1/052 (2022.01); B22F 1/06 (2022.01); B22F 1/08 (2022.01); B22F 1/09 (2022.01); B22F 1/102 (2022.01); B22F 3/02 (2013.01); C22C 45/02 (2013.01); H01F 1/153 (2013.01); H01F 1/15375 (2013.01); H01F 1/22 (2013.01); H01F 1/26 (2013.01); H01F 3/08 (2013.01); H01F 17/06 (2013.01); H01F 41/0246 (2013.01); B22F 2999/00 (2013.01); H01F 17/062 (2013.01);
Abstract

A dust core contains a powder of a crystalline magnetic material powder and a powder of an amorphous magnetic material. The sum of the content of the crystalline magnetic material powder and the content of the amorphous magnetic material powder is 83 mass percent or more. The mass ratio of the content of the crystalline magnetic material powder to the sum of the content of the crystalline magnetic material powder and the content of the amorphous magnetic material powder is 20 mass percent or less. The median diameter D50a of the amorphous magnetic material powder is greater than or equal to the median diameter D50c of the crystalline magnetic material powder. A 10% cumulative diameter D10a in a volume-based cumulative particle size distribution of the amorphous magnetic material powder is 9.5 μm or less.

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