Servo apparatus of an optical disc having calibration for gain c

Details Servo apparatus of an optical disc having calibration for gain c Servo apparatus of an optical disc having calibration for gain c

1990-11-21

1994-09-13

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4435, 369 4429, G11B 700

Patent

active

053475011

ABSTRACT:
A servo apparatus of an optical disc, comprises an amplitude detector for detecting an amplitude of a servo detection signal which was extracted by an optical pickup when servo focusing is operating. A gain control signal generator generates a gain control signal for providing a predetermined relation between the amplitude detected by the amplitude detector and a reference value. A controller holds the gain control signal generated by the gain control signal generator and controls the amplitude of the servo detection signal by the gain control signal upon a recording or reproducing operation by the optical pickup.

REFERENCES:
patent: 4878135 (1989-10-01), Makino et al.
patent: 4942564 (1990-07-01), Hofer et al.
patent: 4951273 (1990-08-01), Yoshida et al.
patent: 5079757 (1992-01-01), Wachi et al.
patent: 5251194 (1993-10-01), Yoshimoto et al.

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