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:
Sep. 25, 2007
Filed:
Nov. 02, 2006
Chio Ishihara, Tokyo, JP;
Kazuo Asaka, Matsudo, JP;
Kei Ishii, Higashikatsushika-gun, JP;
Tamio Takada, Kashiwa, JP;
Tsuyoshi Akao, Kariya, JP;
Isao Makino, Chiryu, JP;
Chio Ishihara, Tokyo, JP;
Kazuo Asaka, Matsudo, JP;
Kei Ishii, Higashikatsushika-gun, JP;
Tamio Takada, Kashiwa, JP;
Tsuyoshi Akao, Kariya, JP;
Isao Makino, Chiryu, JP;
Hitachi Powdered Metals Co., Ltd., Matsudo, JP;
Denso Corporation, Kariya, JP;
Abstract
The present invention provides a production method for a powdered core, including steps of preparing a mixture including a soft magnetic powder and a resin powder to obtain a mixture, compacting the mixture into a predetermined shape to obtain a green compact and heating the green compact, and wherein the resin powder has a median size of not more than 50 μm, and the resin powder amount is 0.01 to 5 vol %. The method reduces production cost, and decreases eddy-current loss Wand hysteresis loss W, whereby a powdered core in which a durability is improved and the technical advantages are expanded can be provided.