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:
Jul. 16, 2002
Filed:
Jun. 04, 2001
Satoshi Takemoto, Ichinomiya, JP;
Takanobu Saito, Okazaki, JP;
Daido Tokushuko Kabushiki Kaisha, Nagoya, JP;
Abstract
A powder magnetic core is made from powder containing Fe-based soft magnetic powder as a major component. Provided that an initial permeability of the core is &mgr; and that a permeability of the core observed when a magnetic field of 24 kA/m is applied to the core is &mgr;, &mgr; and &mgr; fulfill the relationship &mgr;/&mgr; ≧0.5. Specifically, the powder magnetic core is made from 60 to 75 volume % of soft magnetic powder having an aspect ratio (L /L ) of 1 to 1.5 and the balance containing an insulating binder as a major component, and the content of the insulating binder is 5 to 20 parts by weight with respect to 100 parts by weight of the soft magnetic powder. The powder magnetic core shows a small reduction in the permeability even when the strength of a magnetic field applied thereto is increased.