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:
May. 22, 2018
Filed:
Feb. 08, 2013
Applicant:
Fdk Corporation, Tokyo, JP;
Inventors:
Assignee:
FDK CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 21/00 (2006.01); H01F 17/06 (2006.01); H01F 27/24 (2006.01); H01F 17/04 (2006.01); H01F 3/14 (2006.01); H01F 3/10 (2006.01);
U.S. Cl.
CPC ...
H01F 3/14 (2013.01); H01F 17/043 (2013.01); H01F 2003/103 (2013.01); H01F 2003/106 (2013.01);
Abstract
A choke coil including a coil () and a core () including a first core part () inserted into a central hole of the coil () and a plurality of second core parts () disposed along the outer periphery of the coil. The first core part () and the second core part () form a closed magnetic path. The second core parts () are shaped so that the total sum of the areas of cross sections thereof perpendicular to the axis of the coil is greater than the area of a cross section of the first core part (). A gap part (G) is formed in the second core parts (), and a ferrite magnet () that applies a magnetic bias is disposed in the gap part (G).