Photodisc apparatus with gain control of tracking servo loop

Details Photodisc apparatus with gain control of tracking servo loop Photodisc apparatus with gain control of tracking servo loop

1990-04-26

1991-05-07

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4413, G11B 709, G11B 7095

Patent

active

050142569

ABSTRACT:
A gain control device for controlling the loop gain of a servo tracking system which enables a beam spot formed on a photodisc through an objective lens to trace a track on the disc. The gain control device opens the tracking servo loop and applied a drive signal to a lens actuator so as to move the objective lens across the tracks thereby generating tracking error signals. The device samples the tracking error signals and detects the amplitudes of these signals, and controls the loop gain such that the detected amplitudes fall within a predetermined allowable range.

REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 4866688 (1989-09-01), Ohtake et al.
patent: 4878211 (1989-10-01), Suzuki et al.

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