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:
Jan. 08, 2008
Filed:
Oct. 27, 2004
Shigeru Yanagisawa, Chiba, JP;
Shigeru Yanagisawa, Chiba, JP;
SEIKO Precision Inc., Narashino-shi, Chiba, JP;
Abstract
An electromagnetic actuator includes a cylindrical stator made of a permanent magnet and having annular end faces magnetized to plural magnetic poles, a coil securely disposed in a hollow portion of the stator via a bobbin on which the coil is wound and which is fixed to the stator's hollow portion, a rotary shaft put through the coil in the direction of the center axis thereof in such a way as to be rotatably supported at the bobbin, and a rotor of a soft magnetic material provided in such a way as to rotate together with the rotary shaft and having plural rotor arms radially extending from both end portions of the rotary shaft and facing the respective annular end faces of the stator.