Optical disk apparatus

Details Optical disk apparatus Optical disk apparatus

1989-06-26

1991-11-05

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 32, 369 4432, G11B 700

Patent

active

050635492

ABSTRACT:
An optical disk apparatus detects the speed of movement a laser beam gathered and focused by an objective lens from an optical disk. In a coarse access mode, speed control data is read out of a speed control table based upon the number of tracks corresponding to the difference between the present track and a target track. A linear motor, or an optical head coupled with the motor, is then moved in accordance with a difference between the present speed signal as detected and the speed control signal as read out. In a fine access mode, an objective contained in the optical head is moved in accordance with a difference between the present speed signal and the speed control signal.

REFERENCES:
patent: 4607358 (1986-08-01), Maeda et al.
patent: 4615023 (1986-09-01), Inada et al.
patent: 4901299 (1990-02-01), Nakatsu

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