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:
Oct. 17, 2006
Filed:
Feb. 24, 2004
Kazuo Maezawa, Niigata-ken, JP;
Mamoru Saito, Niigata-ken, JP;
Kazuo Maezawa, Niigata-ken, JP;
Mamoru Saito, Niigata-ken, JP;
Twinbird Corporation, Nishikanbara-gun, JP;
Abstract
A ring-shaped permanent magnet comprising a Nd—Fe—B magnetic material is integrally insert-molded within a distal part of an inner periphery of a cylindrical supporting member. By employing this structure, a coaxial alignment accuracy of the permanent magnet relative to the supporting member depends on only an accuracy of a die for insert-molding. Accordingly, the coaxial alignment accuracy improves, Moreover, the ring-shaped permanent magnet comprising the Nd—Fe—B magnetic material expands in its radial direction when cooled down, while the supporting member comprising a resin contracts, thus the permanent magnet is firmly held by the supporting member. Indeed, a pore space is not created between a bonded surface of the supporting member and that of the permanent magnet. Therefore, the coaxial alignment accuracy will not go wrong.