Archival optical recording medium
AssigneeCorning Glass Works
InventorsNicholas F. Borrelli, Arthur J. Whitman, Peter L. Young
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Abstract
An optical information storage medium comprising a thin, optically darkenable film containing silver, lead, chlorine and oxygen, produced by vapor-depositing AgCl and PbO in specified proportions on a substrate for the film, is described.
Claims7
An optical information storage medium which includes a light-sensitive film in the form of a layer containing a polycrystalline deposition product of silver, lead, chlorine and oxygen, produced by vapor-depositing AgCl and PbO in proportions of about 30-70% PbO and 30-70% AgCl by weight, as calculated on the total weight of the film, on a substrate.
An optical information storage medium which includes a light-sensitive film in the form of alternating layers containing a polycrystalline deposition product of silver, lead, chlorine and oxygen, produced by vapor-depositing alternating layers of AgCl and PbO on a substrate, wherein PbO is deposited in a proportion of about 30-70% by weight and AgCl is deposited in a proportion of about 30-70% by weight as calculated on the total weight of the film.
An optically darkenable material consisting essentially of a polycrystalline deposit of silver, lead, chlorine and oxygen, produced by the vapor deposition of PbO and AgCl in a layer on a substrate in proportions of about 30-70% PbO and 30-70% AgCl by weight.
A method for optically storing information in the form of optical density variations in a light-sensitive medium which comprises the step of exposing the medium to light, wherein the medium contains a polycrystalline deposition product of lead, silver, chlorine, and oxygen produced by the vapor deposition on a substrate of a layer or alternating layers of PbO and AgCl in proportions of about 30-70% PbO and 30-70% AgCl by weight as calculated on the total weight of the layers.
Dependencies are inferred from the claim text.