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:
Nov. 08, 2011
Filed:
Jan. 22, 2010
Nobuyuki Kobayashi, Nagoya, JP;
Kazuyuki Mizuno, Nagoya, JP;
Natsumi Shimogawa, Nagoya, JP;
Shuichi Ozawa, Nagoya, JP;
Nobuyuki Kobayashi, Nagoya, JP;
Kazuyuki Mizuno, Nagoya, JP;
Natsumi Shimogawa, Nagoya, JP;
Shuichi Ozawa, Nagoya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A compact inductor comprises a coil, a coil-burying body, and a body for a closed magnetic circuit. The coil-burying body is a fired porous ceramic body having a first magnetic permeability, in which the coil is buried. In the coil-burying body, 'a through-holepassing through inside of the coil along an axis of the coil' is formed. The body for a closed magnetic circuit is a fired dense ceramic body having a second magnetic permeability greater than the first magnetic permeability. The body for a closed magnetic circuit is arranged closely/densely at an outer circumference portion of the coil-burying body and in the through-hole. A magnetic path is therefore formed mainly within the body for a closed magnetic circuit, and the magnetic flux density is reduced in an area close to the coil. Accordingly, an inductor having the excellent superimposed DC current characteristic is provided.