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:
Sep. 12, 2006
Filed:
Jan. 28, 2002
Hideaki Yano, Osaka, JP;
Kenji Asano, Kakamigahara, JP;
Hideharu Baba, Gifu, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
The present invention provides a disk playback device comprising a laser drive circuitfor feeding a drive signal to an optical headand adjusting the power of a laser beam irradiated by the optical head, an error correcting circuitfor detecting an error rate of a reproduced signal, and a system controllerfor controlling operation of the laser drive circuit for signal reproduction and signal recording based on the output of the error correction circuit. The system controllerretrieves one limit value of two limit values of a reproduction power wherein the error rate is not beyond a prescribed value, and calculates an optimum reproduction power based on the one limit value retrieved. Accordingly it is possible to move to signal reproduction in a short period of time and to reproduce signals with high accuracy by setting the optimum reproduction power.