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:
Jul. 03, 2012
Filed:
Aug. 26, 2009
Osamu Kajino, Osaka, JP;
Hidenori Wada, Kyoto, JP;
Haruhisa Yagi, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A deterioration of reproduction light is occurred by a laser drive current on which a high-frequency current is superimposed. The present invention, for example, is an optical information reproducing apparatus which irradiates a laser beam to an optical discand reads an information, the optical information reproducing apparatus includes a semiconductor laserwhich generates the laser beam, a laser drive unitwhich supplies a drive current on which a high-frequency current are superimposed to the semiconductor laser, a spindle motorwhich drives the optical discand a control unitwhich controls the laser drive unitand the spindle motor, and the control unitdetermines a parameter of the high-frequency current based on magnitude of a current on which the high-frequency current is to be superimposed.