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US 4,077,051 AGranted
Video disc with a conductive layer having an oxygen content gradient
AssigneeRCA Corporation
InventorJohn Louis Vossen, Jr.
Life of this patent
Estimating the term…
Abstract
This invention pertains to a video disc having a conductive bilayer thereon of a copper layer and a nickel/chromium/iron alloy layer wherein the alloy layer contains oxygen which decreases in content from the copper-alloy interface to an alloy-dielectric interface.
Claims10
A capacitive recording means comprising:
- a. a disc having a spiral groove on a surface thereof with video information in the form of geometric variations in said groove;
- b. a thin conductive bilayer film disposed on said surface of the disc having a first layer of copper and a second layer of an alloy of nickel and chromium which contains up to about 10% by weight of iron;
- and
- c. a polymeric dielectric layer disposed on the conductive film
- wherein the alloy layer contains from about 5 to about 20 average atomic percent of oxygen and the oxygen content forms a concentration gradient decreasing from the interface between the copper layer and the alloy layer to the interface between the alloy layer and the polymeric dielectric layer.
2 more elements
Dependencies are inferred from the claim text.