Disk recording-playback device

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval

Reexamination Certificate

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Details

C369S013240, C369S013260

Reexamination Certificate

active

07133344

ABSTRACT:
A disk recording-playback device including a laser drive circuit for feeding a drive signal to an optical head and adjusting the power of a laser beam irradiated by the optical head, an error correcting circuit for detecting an error rate of a reproduced signal, and a system controller for controlling operation of the laser drive circuit for signal reproduction and signal recording based on the output of the error correcting circuit. The system controller successively sets the laser powers to at least three different values, obtains evaluation data for each laser power, approximates the relationships between the laser powers and the evaluation data to a quadratic curve, whereby an optimum laser power is derived corresponding to a vertex of the quadratic curve. Accordingly the optimum reproduction power and recording power are set, to thereby record and reproduce signals with high accuracy.

REFERENCES:
patent: 5796704 (1998-08-01), Nanba et al.
patent: 6519212 (2003-02-01), Ashinuma
patent: 1-158648 (1989-06-01), None
patent: 01-158648 (1989-06-01), None
patent: 03-116566 (1991-05-01), None
patent: 3-116566 (1991-05-01), None
patent: 08-221760 (1996-08-01), None
patent: 8-221760 (1996-08-01), None
patent: 11-273073 (1999-10-01), None
patent: 11-273078 (1999-10-01), None
patent: 2002-25066 (2002-01-01), None
Japanese Office Action dated Jun. 7, 2005.

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