Ablative optical recording medium
AssigneeRCA Corporation
InventorsAllen Bloom, Robert Alfred Bartolini, Alan Edward Bell
Life of this patent
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Abstract
An ablative recording medium comprises a substrate coated with a light reflecting coating which in turn is coated with a light absorptive layer of 4-phenylazo-1-naphthylamine formed by evaporation of Sudan Black B dyestuff. During recording, portions of the organic coating are ablated, or vaporized, by a modulated focussed light beam, thereby exposing portions of the reflective layer and recording video information as a reflective-antireflective pattern.
Claims13
In an ablative optical recording medium which comprises a light reflecting material coated with a light absorbing layer, the improvement which comprises employing as the light absorbing layer an amorphous layer of 4-phenylazo-1-naphthylamine.
A method of making an optical recording medium which comprises
- evaporating a layer of aluminum about 250 to about 500 angstroms thick onto a substrate under vacuum,
- oxidizing said aluminum layer to a depth of from about 25 to about 30 angstroms, and
- evaporating Sudan Black B dyestuff under vacuum to form a layer of 4-phenylazo-1-naphthylamine on said oxidized aluminum layer.
Dependencies are inferred from the claim text.