Optical disk unit

Details Optical disk unit Optical disk unit

1990-04-04

1992-10-20

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 32, 369 43, 369 59, G11B 700

Patent

active

051576457

ABSTRACT:
An optical disk unit is incidence a light spot upon an optical disk. The light spot is radially moved to cross tracks formed on the optical disk. The tracks are provided with specific access marks. The number of access marks passed by the light spot as well as the number of tracks crossed by the light spot until a change is found in a detected access mark are counted. The latter number is divided by the former number and multiplied by a coefficient to provide a speed signal indicative of a speed of the light spot relative to the optical disk.

REFERENCES:
patent: 4751695 (1988-06-01), Kaku et al.
patent: 4866687 (1989-09-01), Kasai et al.
patent: 4918676 (1990-04-01), Miyasaka
patent: 5034940 (1991-07-01), Saito et al.

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