Servo control circuit for optical disc apparatus

Details Servo control circuit for optical disc apparatus Servo control circuit for optical disc apparatus

1989-12-22

1992-08-11

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 709

Patent

active

051385953

ABSTRACT:
An automatic servo gain control system for an optical disk player apparatus is capable of controlling an open-loop servo gain to be constant, regardless of parameter variations including variations in the optical head actuator gain. The system includes a gain control circuit that varies a gain for a first signal indicative of a positional relationship between the optical head and an optical disk based on a second signal providing light intensity information. The system further includes an oscillator that produces an output at a frequency within a servo frequency band of the optical head actuator and that is introduced into a servo loop via an operational amplifier. Signal values at an input side and an output side of the operational amplifier in the servo loop are compared so as to vary the gain for the first signal based on a difference between the input and output signal values. The system operates to control the input and output signal values to be at a predetermined rate, thereby keeping the open-loop servo gain constant.

REFERENCES:
patent: 4878211 (1989-10-01), Suzuki et al.

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