Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2004-08-30
2008-10-21
Tran, Thang V (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
Reexamination Certificate
active
07440370
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.
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Extended Abstracts(The 64thAutumn Meeting, 2003); The Japan Society of Applied Physics No. 3, Aug. 30-Sep. 2, 2003, JSAP Catalog No. AP 031129-03, 5 pg.
Fukuzawa Narutoshi
Kikukawa Takashi
Kobayashi Tatsuhiro
Kuwahara Masashi
Shima Takayuki
Seed IP Law Group PLLC
TDK Corporation
Tran Thang V
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