Dynamic information storage or retrieval – Control structure on storage medium sensed by other than...
Patent
1982-04-27
1985-12-03
Cardillo, Jr., Raymond F.
Dynamic information storage or retrieval
Control structure on storage medium sensed by other than...
369 50, 369275, G11B 724, G11B 700
Patent
active
045569665
ABSTRACT:
The angular velocity of an information element contained in the precut track of an information carrier disk is controlled by means of a concentric circular ring located internally with respect to the precut track and constituted by mark zones uniformly spaced in angular sectors. A light beam is projected onto the circular ring and the emergent beam is modulated as a function of the mark zones and blank zones which form the circular ring. Errors arising from eccentric displacement of the track can thus be corrected and the rate of travel of information can be controlled in relation to the reading or recording light beam.
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Berthet Pierre
Bricot Claude
Gerard Jean-Louis
Mertz Bruno
"Thomson-CSF"
Cardillo, Jr. Raymond F.
Garland Steven R.
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