Focusing control apparatus for an optical disk system employing

Details Focusing control apparatus for an optical disk system employing Focusing control apparatus for an optical disk system employing

1993-12-29

1995-03-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4413, 369 4436, G01J 120

Patent

active

053998499

ABSTRACT:
A focusing control apparatus for use in an optical disk system includes a focusing error detector for detecting the focusing error signal from the focusing information of a light beam irradiated onto and reflected by an optical disk, a system state gain controller for detecting the state of the system from an error signal detected from the focusing error detector, so as to automatically control the gain of the system according to the change in system gain, a phase compensator circuit for compensating phase of focuing error signal according to the focusing error signal whose gain is controlled by the system state gain control means, and an actuator driving circuit for driving the actuator according to the compensated signal, so as to maintain system stability.

REFERENCES:
patent: 4475182 (1984-10-01), Hosaka
patent: 4667315 (1987-05-01), Fujii et al.
patent: 4669074 (1987-05-01), Hsieh et al.
patent: 4985882 (1991-01-01), Tanaka et al.

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