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:
Mar. 05, 2013
Filed:
Sep. 15, 2010
Eiji Yokoyama, Tokyo, JP;
Eiji Yokoyama, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
As a measure against vibration caused by disturbance due to mass eccentricity of a disc, a conventional disc device has a means to add an auxiliary mass that passively operates. This method has no way to enhance vibration damping effect other than setting the auxiliary mass to be large, and therefore there is a problem that the device becomes large. An auxiliary massis actively driven by an auxiliary mass driving portion. The driving of the auxiliary massis performed by amplifying a signal corresponding to a force transmitted from a main frame portionto the auxiliary mass. This achieves a vibration damping effect using the small auxiliary massto the same degree as that where the large auxiliary mass is mounted.