Optical disk access system

Details Optical disk access system Optical disk access system

1988-08-24

1991-12-31

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 44280, 369 44290, G11B 7095

Patent

active

050777190

ABSTRACT:
An optical disk access system capable of varying the focus position of a beam spot illuminating the optical disk. The focus position of the beam spot is varied in accordance with a mode of operation of the optical disk system. The various focus positions are automatically selected by the optical disk access system by intentionally vibrating the beam spot in a radial direction of the optical disk and detecting the amount of light reflected from the optical disk while varying a signal that changes the focus position of the beam spot. The optical disk system automatically selects a value of the signal determining the focus position of the beam spot that corresponds to maximum values derived from the light reflected from the optical disk.

REFERENCES:
patent: 4546460 (1985-10-01), Ando
patent: 4581664 (1986-04-01), Sordello et al.
patent: 4700056 (1987-10-01), Silvy et al.
patent: 4707648 (1987-11-01), Minami
patent: 4769801 (1988-09-01), Funada et al.
patent: 4866688 (1989-09-01), Ohtake et al.
patent: 4893201 (1990-01-01), Emori et al.

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