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. 03, 2009
Filed:
Jun. 23, 2006
Akira Doi, Hitachinaka, JP;
Haruaki Otsuki, Hitachinaka, JP;
Atsushi Sakamoto, Hitachinaka, JP;
Souichi Toyama, Ebina, JP;
Yaichi Okubo, Ebina, JP;
Akira Doi, Hitachinaka, JP;
Haruaki Otsuki, Hitachinaka, JP;
Atsushi Sakamoto, Hitachinaka, JP;
Souichi Toyama, Ebina, JP;
Yaichi Okubo, Ebina, JP;
Hitachi Via Mechanics, Ltd., Ebina-shi, JP;
Abstract
A scanner has a rotor, and a stator disposed in the outside of the rotor. The rotor includes a shaft, and a permanent magnet mounted on the outer circumferential side of the shaft. The stator includes a casing, a yoke held in the inner circumferential side of the casing, and coils disposed in the inner circumferential side of the yoke. The permanent magnet of the rotor has radially depressed grooves formed in its outer circumferential portion. The torque constant of the scanner is circumferentially equalized by the grooves.