Method and device for generating a stable power control signal

Details Method and device for generating a stable power control signal Method and device for generating a stable power control signal

2007-10-23

2007-10-23

Korzuch, William R. (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal processing for controlling recording light...

C369S053260, C369S116000

Reexamination Certificate

active

10990909

ABSTRACT:
Method and device for generating a stable power control signal in a CD recorder. The power control signal for controlling a laser diode may be a read level, an erase level and a write level. A pickup device outputs a feedback control signal to a read control circuit, and a read power control voltage is thus obtained. Then, the read power control voltage is inputted to a write control circuit, which generates first and second write power control voltages. The read level equals a reference voltage added by the read power control voltage, the erase level equals the read level added by the first write power control voltage, and the write level equals the erase level added by the second write power control voltage, so the read power control voltage and thus the read, erase and write levels are automatically and dynamically adjusted as the feedback control signal varies.

REFERENCES:
patent: 5568464 (1996-10-01), Horie
patent: 6404713 (2002-06-01), Ueki
patent: 6628594 (2003-09-01), Park
patent: 2004/0052183 (2004-03-01), Yu et al.
patent: 2004/0130993 (2004-07-01), Nadershahi
patent: 2004/0179451 (2004-09-01), Morishima et al.

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