Gain control system for error signal amplifier in tracking servo

Details Gain control system for error signal amplifier in tracking servo Gain control system for error signal amplifier in tracking servo

1989-11-01

1992-08-25

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

364 4429, 364 4434, G11B 709

Patent

active

051425181

ABSTRACT:
A system for controlling a gain of an error signal amplifier, the system including an error signal generation device for generating a tracking error signal corresponding to an interval between a pickup information reading point, and a recording track, on a recording disk, a position detection unit for generating a position detection signal corresponding to a position of the pickup, an error signal amplifier for amplifying the tracking error signal, and a control device for controlling a tracking state of the pickup information reading point in accordance with an output of the error signal amplifier. The control device is operable for stopping a tracking state, moving the pickup information reading point in the radial direction of said disk, measuring a level of the tracking error signal at a plurality of different positions of the disk, calculating a plurality of gain data corresponding to the respective values of the levels of the tracking error signal measured at the plurality of positions, and writing the calculated gain data into a memory. The control device is further operable for re-starting the tracking state, detecting the position of the pickup information reading point, reading out, from the memory, the gain data corresponding to the detected position, and controlling the gain of the error signal amplifier according to the read-out gain data.

REFERENCES:
patent: 4344165 (1982-08-01), Akiyama
patent: 4769801 (1988-09-01), Funada et al.

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