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. 04, 2008
Filed:
Apr. 25, 2006
Hiroaki Naganuma, Kofu, JP;
Yosuke Sajiki, Kofu, JP;
Hiroaki Naganuma, Kofu, JP;
Yosuke Sajiki, Kofu, JP;
Nisca Corporation, Minamikoma-Gun, Yamanashi, JP;
Abstract
An electromagnetically-driving device has a rotor with a hollow, cylindrical permanent magnet; an inside yoke on an internal circumference side of the rotor; an outside yoke on an external circumference side of the rotor; and a coil for magnetically exciting the yokes. The outside yoke has a trough shape, and two opposed magnetic pole-guide pieces, between which magnetic poles of the permanent magnet are sandwiched. The rotor has a bearing portion in the internal circumference wall of the body, and the bearing portion engages a shaft portion of the inside yoke. When a magnetic field is generated by the coil, a rotation force is applied to the rotor, resulting in a structurally-simple magnetic circuit.