G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/095 (2006.01) G11B 7/007 (2006.01) G11B 7/013 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 21/08 (2006.01)
Patent
CA 1267723
49 ABSTRACT OF THE DISCLOSURE 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 scanning 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.
523833
Bec Daniel
Collomby Michel
Gerard Jean-Louis
Goudreau Gage Dubuc
Societe Anonyme Dite: Alcatel Thomson Gigadesc
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