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:
Mar. 23, 2010
Filed:
Jan. 28, 2005
Hirokazu Kugai, Itami, JP;
Naoto Igarashi, Itami, JP;
Toru Maeda, Itami, JP;
Kazuhiro Hirose, Itami, JP;
Haruhisa Toyoda, Itami, JP;
Koji Mimura, Itami, JP;
Takao Nishioka, Itami, JP;
Hirokazu Kugai, Itami, JP;
Naoto Igarashi, Itami, JP;
Toru Maeda, Itami, JP;
Kazuhiro Hirose, Itami, JP;
Haruhisa Toyoda, Itami, JP;
Koji Mimura, Itami, JP;
Takao Nishioka, Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
The object of the present invention is to provide a powder core and method for making the same that is equipped with insulative coating having superior heat resistance, with the coating making it possible to adequately restrict the flow of eddy currents between particles. The powder core is equipped with a plurality of compound magnetic particles bonded to each other. Each of said plurality of composite magnetic particles includes: a metal magnetic particle; an insulative lower layer coatingsurrounding a surfaceof said metal magnetic particle; an upper layer coatingsurrounding said lower layer coatingand containing silicon; and dispersed particlescontaining a metal oxide compound and disposed in said lower layer coatingand/or said upper layer coating. A mean particle diameter R of the dispersed particlesmeets the condition 10 nm<R≦2 T, where the average thickness of the coating combining the lower layer coatingand the upper layer coatingis T.