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. 15, 2003
Filed:
Mar. 15, 2001
Shoji Yoshida, Niigata-ken, JP;
Hidetaka Kenmotsu, Niigata-ken, JP;
Takao Mizushima, Niigata-ken, JP;
Kazuaki Ikarashi, Niigata-ken, JP;
Yutaka Naito, Niigata-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A magnetic powder core comprises a molded article of a mixture of a glassy alloy powder and an insulating material. The glassy alloy comprises Fe and at least one element selected from Al, P, C, Si, and B, and has a texture primarily composed of an amorphous phase. The glassy alloy exhibits a temperature difference &Dgr;T , which is represented by the equation &Dgr;T =T −T , of at least 20 K in a supercooled liquid, wherein T indicates the crystallization temperature and T indicates the glass transition temperature. The magnetic core precursor is produced mixing the glassy alloy powder with the insulating material, compacting the mixture to form a magnetic core precursor, and annealing the magnetic core precursor at a temperature in the range between (T −170) K and T K to relieve the internal stress of the magnetic core precursor. The glassy alloy exhibits low coercive force and low core loss.