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:
Oct. 04, 2011
Filed:
Apr. 22, 2009
Kenji Hirose, Utsunomiya, JP;
Kenji Hirose, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A galvano motorincludes a motor shaft, a coilwhich rotationally drives the motor shaft, and an encoder scalewhich is joined to one end of the rotating shaft, the motor shaftis configured so that a mirrorwhich is heavier than the encoder scaleat the other end opposite to the one end to which the encoder scaleis joined, a phase crossover frequency fphase in open-loop characteristics of the galvano motor, a torsion resonance frequency fscale between a center part of the motor shaftand the encoder scale, and a torsion resonance frequency fmirror between the center part of the motor shaftand the mirrorsatisfy the relation of fphase<fscale≦fmirror, and phases at the torsion resonance frequencies fscale and fmirror are other than −180 degrees.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile