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:
Nov. 20, 2007
Filed:
Mar. 30, 2004
Applicants:
Hiroharu Sakai, Tokyo, JP;
Hiroyuki Hayashi, Yokohama, JP;
Takashi Matsuda, Tokyo, JP;
Inventors:
Assignee:
Hitachi-LG Data Storage, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A write power determining method for an optical disk drive determines optimum write power information of an optical disk during the high-speed rotation of the disk. A push-pull signal amplitude is obtained at two positions in a radial direction of an optical disk before writing. A linearization value of optimum write power associated with radial positions over the whole writing area of the disk is determined on the basis of the obtained push-pull signal amplitude. The determined result is adopted as optimum write power information associated with the radial positions of the disk.