Track jump control circuit of optical disk apparatus properly co

Details Track jump control circuit of optical disk apparatus properly co Track jump control circuit of optical disk apparatus properly co

1995-07-20

1997-11-04

Edun, Muhammad N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, 369 4434, 369 32, G11B 709

Patent

active

056847670

ABSTRACT:
A tracking servo system of an optical disk apparatus is formed of a pickup irradiating laser on an optical disk on which information is recorded to reproduce the information, a tracking error detecting circuit detecting a tracking error signal TES which is a servo signal acquired by the pickup, a tracking control circuit performing tracking control based on the tracking error signal TES detected by the tracking error detecting circuit, a track jump control circuit controlling a track jump based on the tracking error signal TES, and a driver supplying a control signal from the tracking control circuit and the track jump control circuit through an adding circuit and driving an actuator of the pickup.
The light emitted from the laser in the pickup is reflected by the optical disk having a spiral information track and led to the pickup again. From the quantity of reflected light detected by a photodiode in the pickup, a tracking error signal TES showing displacement quantity from the center of the information track of the optical spot is computed by the tracking error detecting circuit. The tracking error signal is supplied to the tracking control circuit and track jump circuit.

REFERENCES:
patent: 5195069 (1993-03-01), Nakano
patent: 5216650 (1993-06-01), Noguchi
patent: 5285432 (1994-02-01), Nakane
patent: 5408454 (1995-04-01), Hasegawa
patent: 5481517 (1996-01-01), Yoshimoto et al.

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