Metallized video disc having an insulating layer thereon

Claim 2

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.

Claim 3

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.

Claim 4

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.

Claim 5

A record according to claim 2 wherein said conductive metal layer is gold.

Claim 6

A record according to claim 2 wherein said conductive metal layer is nickel having sufficient surface energy such that the contact angle of water on its surface is below about 30°.

Claim 7

A record according to claim 2 wherein R is an alkyl group of 4 to 20 carbon atoms and x is an integer from 7 to 24.

Claim 8

A record according to claim 4 wherein the methyl alkyl siloxane has a room temperature viscosity of about 1400 centistokes and wherein R is decyl.