Information carrier disk with angular coding means and a...

Details Information carrier disk with angular coding means and a... Information carrier disk with angular coding means and a...

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G11B 7/00 (2006.01) G11B 7/24 (2006.01) G11B 19/28 (2006.01) G11B 23/42 (2006.01) G11B 27/26 (2006.01) G11B 27/32 (2006.01)

Patent

CA 1187607

AN INFORMATION CARRIER DISK WITH ANGULAR CODING MEANS AND A SYSTEM FOR DRIVING SAID DISK IN ROTATION Abstract of the Disclosure 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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