Optical disc apparatus

Details Optical disc apparatus Optical disc apparatus

2007-11-20

2007-11-20

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

C369S053260

Reexamination Certificate

active

10901560

ABSTRACT:
An optical disc apparatus provided with an automatic power control circuit which controls power of laser light by obtaining a difference between a value detected by a front monitor6and a target value individually for reproduction power and for recording power includes: a detector7for detecting light reflected from an optical disc, a sample-hold circuit26which performs on an output of the detector7a sample-hold operation at the timing of the reproduction power; and a microcomputer29which computes a reference value from the reflected light of the reproduction power at the timing just before the start of a recording operation after receiving a recording command until opening of a recording gate, and at the time of recording operation an intensity of reflected light on which a sample-hold operation is performed is compared with the reference value to correct a target value of the reproduction power.

REFERENCES:
patent: 7113468 (2006-09-01), Udagawa
patent: 2001/0005340 (2001-06-01), Nishikawa
patent: 2002/0196719 (2002-12-01), Morishima
patent: 2003-141767 (2003-05-01), None
patent: WO02/097804 (2002-12-01), None

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