Optical disc system

Details Optical disc system Optical disc system

1992-02-06

1993-07-27

Pascal, Robert J.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4426, 369 4429, 369 4435, G11B 700

Patent

active

052316181

ABSTRACT:
An optical disc system is provided with a focusing error signal generator for detecting any focusing error from light reflected by an optical disc and outputting a focusing error signal; a driver for outputting a focusing drive current on the basis of the focusing error signal; and an actuator for shifting an optical pickup in a focusing direction in accordance with the focusing drive signal. The optical disc system also has a signal detection and processing unit for detecting each index point (ID) on the optical disc and generating an index gate signal indicating an address between the index point and another index point next to the first-mentioned index point in the tracking direction; and an inter-ID holder for holding, based on the index gate signal, the focusing error signal at a signal level right before the first-mentioned index point.

REFERENCES:
patent: 4611317 (1986-09-01), Takeuchi et al.
patent: 4747089 (1988-05-01), Eguchi et al.
patent: 4795958 (1989-01-01), Nakamura et al.
patent: 5070491 (1991-12-01), Horie
patent: 5146443 (1982-09-01), Twase et al.

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