Laser power selecting method, information recording medium,...

Details Laser power selecting method, information recording medium,... Laser power selecting method, information recording medium,...

2006-12-26

2006-12-26

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S059240, C369S047530, C369S124150

Reexamination Certificate

active

07154833

ABSTRACT:
A laser power selecting method includes the steps of recording an asymmetry measuring recording pattern in an optical disk trial-writing area while a laser power is being changed, reproducing a signal from the trial-writing area to calculate an asymmetry value from the waveform of the reproduced signal, determining the change rate of asymmetry from the relation between a laser power when the recording pattern is recorded and the calculated asymmetry value, and setting a laser power, at which the determined change rate of an asymmetry value is maximum, as a recording power used when recording on an optical disk.

REFERENCES:
patent: 2002/0105874 (2002-08-01), Matsumoto
patent: 2003/0007435 (2003-01-01), Fukumoto
patent: 10-124876 (1998-05-01), None
patent: 10-124950 (1998-05-01), None
patent: 10-283656 (1998-10-01), None
patent: 2001-283436 (2001-10-01), None
patent: 2002-260230 (2002-09-01), None
International Search Report for PCT/JP2003/011992 dated Dec. 11, 2003.
Internatinal Preliminary Examination Report mailed by PCT on Jun. 23, 2005 in connection with corresponding PCT application PCT/JP2003/011992.

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