Polycrystalline tin oxide-silver chloride-cadmium chloride UV photosensitive film and method of use
AssigneeCorning Glass Works
InventorsNicholas F. Borrelli, Peter L. Young
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Abstract
An ultraviolet-sensitive optical information recording material comprising doped silver chloride and tin oxide which exhibits high ultraviolet darkening sensitivity and good resistance to darkening or bleaching by visible light, and a method for optically recording information in permanent, optically-readable form in such a material by direct writing without chemical development, are described.
Claims5
A method for optically recording information in permanent form which comprises the step of exposing selected portions of a polycrystalline material having a composition which consists essentially of tin oxide, silver chloride, cadmium chloride and, optionally, copper chloride to ultraviolet light of a wavelength below 400 nm for a time sufficient to selectively darken said portions to a level providing an optical contrast ratio of at least about 3 between said portions and the unexposed portions of the material.
Dependencies are inferred from the claim text.