Metallized video disc having an insulating layer thereon
AssigneeRCA Corporation
InventorsDennis L. Matthies, Robert M. Mehalso, Grzegorz Kaganowicz
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Abstract
Methyl alkyl siloxanes can be employed as the dielectric coating on metallized video disc replicas when the metal surface on the disc has a high surface energy.
Claims6
A capacitive video frequency recording means having a spiral groove on a face thereof and video information in the form of geometric variations in said groove, said recording means having a thin conductive layer having a high surface energy on said face and a thin dielectric layer of uniform thickness on said conductive layer, said dielectric layer consisting essentially liquid of a liquid methyl alkyl siloxane of the formula ##STR5## wherein R is an alkyl group and x is an integer.
An information record adapted for use with a playback stylus to effect recovery of a signal occupying a band width of at least several megahertz upon rotation of said record, said record comprising
- (a) a disc having a spiral groove in a surface thereof, said groove being dimensioned for reception therein of said stylus and containing an information track constituted by geometric variations in said groove,
- (b) a continuous conductive metal layer on said surface, said layer being of substantially uniform thickness which does not fill said groove and which has a high surface energy,
- (c) a dielectric coating of uniform thickness overlying said metal layer, said dielectric being a liquid methyl alkyl siloxane of the formula ##STR6## wherein R is an alkyl group and x is an integer.
Dependencies are inferred from the claim text.