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:
Feb. 05, 2008
Filed:
Jan. 31, 2003
Naotoshi Iwazawa, Tokyo, JP;
Yutaka Yamanaka, Tokyo, JP;
Ryuichi Katayama, Tokyo, JP;
Masahumi Miura, Tokyo, JP;
Motoaki Shimizu, Tokyo, JP;
Naotoshi Iwazawa, Tokyo, JP;
Yutaka Yamanaka, Tokyo, JP;
Ryuichi Katayama, Tokyo, JP;
Masahumi Miura, Tokyo, JP;
Motoaki Shimizu, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In an optical disk apparatus for focusing a light beam on a track of an optical disk by using a tracking control loop to perform at least one of recording and reproducing operations upon the optical disk, a loop level calculating unit calculates loop levels of the tracking control loop. A control unit calculates a loop gain of the tracking control loop in accordance with the loop levels of the tracking control loop and compensates for a radial tilt of the optical disk in accordance with the calculated loop gain of the tracking control loop.