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. 16, 2007
Filed:
Jul. 08, 2003
Tsuyoshi Yamamoto, Ota, JP;
Koji Tsukagoshi, Fukaya, JP;
Hideki Osawa, Fukaya, JP;
Hiroyuki Mutou, Ora-Gun, JP;
Tsuyoshi Yamamoto, Ota, JP;
Koji Tsukagoshi, Fukaya, JP;
Hideki Osawa, Fukaya, JP;
Hiroyuki Mutou, Ora-Gun, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A DC voltage value is obtained at least at an inside position, an intermediate position, and an outside position on a disc () from a drive signal that is supplied to a focusing coil () built into an optical pickup (). From the DC voltage values is obtained a relationship of a position between the respective positions and the DC voltage value, and this relationship is stored into a memory circuit (). Then, during recording or playback, the DC voltage value that is calculated on the basis of the recording or playback position of the signal at that time and the AC signal included in the drive signal that is supplied to the focusing coil () are added to create a signal to be supplied to a tilt adjustment coil ().