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:
Jan. 12, 2010
Filed:
Jan. 23, 2006
Norio Hatanaka, Kyoto, JP;
Ryoichi Ishikawa, Kyoto, JP;
Hirofumi Inoue, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
To discriminate a disk in a short time, a calculating partmeasures an amplitude of one of a focus error signal and a tracking error signal, which are output from a differential signal generating part, several times, and outputs the measured amplitudes to a controller. The controllercompares the input amplitudes with threshold values stored in a memory, respectively, and determines whether or not an amplification gain of one of the focus error signal and the tracking error signal is changed. If it is determined that the amplification gain of one of the focus error signal and the tracking error signal is changed, the controllerchanges the amplification gain of one of the focus error signal and the tracking error signal to an amplification gain represented by one of the threshold values and discriminates the kind of an optical disk based on the changed amplification gain.