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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 11049641 B1

PDFFull Text
Date of Patent:
Jun. 29, 2021

Filed:

Nov. 29, 2016

Coil device

Applicant:

Tdk Corporation, Tokyo, JP;

Inventors:

Hitoshi Ohkubo, Tokyo, JP;

Kyohei Tonoyama, Tokyo, JP;

Shigeki Sato, Tokyo, JP;

Assignee:

TDK CORPORATION, Tokyo, JP;

Attorney:

Arent Fox LLP

Primary Examiner:

Ronald Hinson

Int. Cl.
CPC ...
H01F 5/00 (2006.01); H01F 27/255 (2006.01); H01F 17/00 (2006.01); H01F 17/04 (2006.01); H01F 27/02 (2006.01); H01F 27/28 (2006.01); H01F 27/29 (2006.01); H01F 27/32 (2006.01); H01F 27/42 (2006.01);
U.S. Cl.
CPC ...
H01F 27/255 (2013.01); H01F 17/0013 (2013.01); H01F 17/04 (2013.01); H01F 27/022 (2013.01); H01F 27/2804 (2013.01); H01F 27/292 (2013.01); H01F 27/324 (2013.01); H01F 27/42 (2013.01); H01F 2017/048 (2013.01); H01F 2027/2809 (2013.01);
Abstract

A coil device comprising a coil, and a magnetic metal powder containing resin covering said coil. Said magnetic metal powder comprises at least two types of magnetic metal powders with different D50. The magnetic metal powder having larger D50 is defined as a large diameter powder, and the magnetic metal powder having smaller D50 is defined as a small diameter powder among the two types of said magnetic metal powder. Said large diameter powder is made of iron or iron based alloy. Said small diameter powder is made of Ni—Fe alloy. Said small diameter powder has D50 of 0.5 to 1.5 μm. Said large diameter powder and said small diameter powder respectively comprises an insulation coating layer.

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