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.:
Date of Patent:
Dec. 25, 2018
Filed:
Sep. 07, 2017
Applicant:
Tdk Corporation, Tokyo, JP;
Inventors:
Yuji Sezai, Tokyo, JP;
Katsushi Yasuhara, Tokyo, JP;
Assignee:
TDK CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 27/29 (2006.01); H01F 27/30 (2006.01); H01F 17/02 (2006.01); H01F 27/28 (2006.01); H01F 17/04 (2006.01);
U.S. Cl.
CPC ...
H01F 27/306 (2013.01); H01F 17/02 (2013.01); H01F 17/04 (2013.01); H01F 27/28 (2013.01); H01F 27/2823 (2013.01); H01F 27/29 (2013.01); H01F 2017/048 (2013.01);
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, SAto SA, 0.55 or less, when an outer diameter of the air-core coil is 'a', an inner diameter of the same is 'a', 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.