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. 12, 2005
Filed:
Apr. 13, 2001
Kunimasa Kusumoto, Saijo, JP;
Mitsuteru Fujimoto, Saijo, JP;
Kunimasa Kusumoto, Saijo, JP;
Mitsuteru Fujimoto, Saijo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
At spin-up of an optical diskgain adjustment and offset adjustment are performed on a servo error signal to obtain a first gain adjustment value and a first offset adjustment value. Based on the first gain adjustment value, a CPUobtains a second gain adjustment value and a second offset adjustment value at data writing on the optical diskand stores them in storageWhen the reading state of the optical diskshifts to the writing operation, the CPUcontrols a laser power switching circuitto change the output from an optical pickupand, simultaneously, reads the second offset adjustment value and gain adjustment value stored in the storageand sets them in an offset adjustment unitand a gain adjustment unitrespectively.