Apparatus and method for accessing a disk characteristic data re

Details Apparatus and method for accessing a disk characteristic data re Apparatus and method for accessing a disk characteristic data re

1988-09-08

1990-11-20

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 58, G11B 700

Patent

active

049723995

ABSTRACT:
An optical apparatus is disclosed for reproducing data by focusing a light beam onto an optical disk. The optical disk has a first area, a second area having a characteristic data of the disk and a third area having data to be reproduced. Each area is located on the disk along the radial direction from the inner portion of the disk to the outer portion of the disk. The optical apparatus includes an optical unit for directing the light beam onto the optical disk, the optical unit facing the first area at an initial condition and a driving unit for moving the optical unit in the radial direction from the inner portion to the outer portion. The optical apparatus further includes a detector for detecting the existence of the second area of the disk while the optical unit is moved by the driving unit.

REFERENCES:
patent: 4498146 (1985-02-01), Martinez
patent: 4769802 (1988-09-01), Tatsuguchi
patent: 4835757 (1989-05-01), Abiko

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