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:
Nov. 25, 2008
Filed:
May. 03, 2005
Kikuo Fukada, Iwata, JP;
Kikuo Fukada, Iwata, JP;
NTN Corporation, Osaka, JP;
Abstract
There is provided in accordance with the present invention a magnetic encoder () including a ring-shaped multipolar magnet () having a plurality of opposite magnetic poles alternating with each other in a direction circumferentially thereof, and a core metal () for supporting the multipolar magnet (). The multipolar magnet () is prepared from a sintered element that is formed by molding under pressure a powdery mixture of a powdery magnetic material and a binder containing a powdery non-magnetic metallic material to provide a green compact and then sintering the green compact to provide the sintered element. The green compact is molded by the application of a molding force of not lower than 65 tons and the binder has a particle size smaller than 40 μm. The sintered element has a density preferably not smaller than 6.6 g/cm.