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. 21, 2009
Filed:
Jan. 18, 2005
Takayuki Ono, Osaka, JP;
Takayuki Ono, Osaka, JP;
Funai Electric Co., Ltd., Osaka, JP;
Abstract
The gain of an amplification circuit for amplifying a tracking error signal generated from an RF signal sent from an optical pickup is adjusted according to a low-frequency component signal sent from a lowpass filter. A drive circuit drives an actuator according to a signal sent from the amplification circuit. Incidentally, in a case where a laser beam converted by an objective lens shifts from a central position of a track of an optical disk, the gain of the amplification circuit is increased according to the low-frequency component signal sent from the lowpass filter. The lens shift is corrected in such a way as to prevent a controlling force, which acts upon the actuator, from being reduced. Consequently, tracking servo can be applied in a stable state.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile