Prewritten data storage medium and optical scanning device there

Details Prewritten data storage medium and optical scanning device there Prewritten data storage medium and optical scanning device there

1988-11-22

1990-09-04

Shoop, Jr., William

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 47, 369 59, 369 4411, G11B 1722

Patent

active

049550080

ABSTRACT:
Data is stored on a prewritten optical data storage medium along a track made up of adjacent elements. A scanning light spot focussed on the medium has to be able to access any element to write, read or modify data there. Prewritten patterns on the medium define a radial graduation scale that is analysed by an optical scaning device using a sampling technique to determine the absolute position of the scanning light spot relative to the track elements, the only material representation of which may be discrete prewritten elements. The technology is particularly applicable to very high density optical memories using a prewritten disk written by thermo-optical interaction with an intensity modulated laser beam.

REFERENCES:
patent: 4566092 (1986-01-01), Gerard et al.
patent: 4669077 (1987-05-01), Gerard et al.
patent: 4685096 (1987-08-01), Romeas
patent: 4704711 (1987-11-01), Gerard et al.

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