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:
Dec. 23, 2003
Filed:
Jul. 09, 2001
Applicant:
Inventors:
Hisashi Yajima, Tsukuba-gun, JP;
Kazuya Tamura, Tsukuba-gun, JP;
Assignee:
SMC Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01F 7/08 ;
U.S. Cl.
CPC ...
H01F 7/08 ;
Abstract
The invention includes an annular exciting coil , a main yoke surrounding a periphery of the exciting coil and having polar teeth and disposed to face each other on opposite end sides of a central hole of the exciting coil, and a cylindrical permanent magnet disposed in the central hole of the exciting coil to be movable in an axial direction of the hole and polarized in a radial direction.