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:
Oct. 21, 2008
Filed:
Aug. 30, 2004
Masashi Kuwahara, Ibaraki, JP;
Takayuki Shima, Ibaraki, JP;
Junji Tominaga, Ibaraki, JP;
Takashi Kikukawa, Tokyo, JP;
Narutoshi Fukuzawa, Tokyo, JP;
Tatsuhiro Kobayashi, Tokyo, JP;
Masashi Kuwahara, Ibaraki, JP;
Takayuki Shima, Ibaraki, JP;
Junji Tominaga, Ibaraki, JP;
Takashi Kikukawa, Tokyo, JP;
Narutoshi Fukuzawa, Tokyo, JP;
Tatsuhiro Kobayashi, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A method for determining a read power of a laser beam includes a step of setting a power of a laser beam to a recommended recording power Pw' and forming a recording mark train including at least one of a recording mark having a length shorter than a resolution limit and a blank region having a length shorter than the resolution limit in an optical recording disc, thereby recording test data therein. The method also includes a step of setting the power of the laser beam to a recommended read power Pr′ and reproducing the test data recorded in the optical recording disc, a step of judging whether or not signal characteristics of a reproduced signal obtained by reproducing the test data satisfies reference conditions, and determining an optimum read power of the laser beam based on the result of the judgment.