Silver halide optical information storage media
First Claim
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1. A visibly absorbing, optically bleachable inorganic film comprising multiple polycrystalline silver chloride layers containing crystals of additively colored silver chloride, having a thickness not exceeding about 2 microns, which exhibits, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
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Abstract
Optically bleachable multilayer films containing additively colored silver chloride which exhibit high infrared transmittance and good bleaching sensitivity, and optical information storage media incorporating such films, are described.
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Citations
12 Claims
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1. A visibly absorbing, optically bleachable inorganic film comprising multiple polycrystalline silver chloride layers containing crystals of additively colored silver chloride, having a thickness not exceeding about 2 microns, which exhibits, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
- 2. A multilayer photosensitive inorganic film having a thickness not exceeding about 2 microns and comprising alternating layers of PbO and AgCl, including at least three AgCl layers comprising additively colored AgCl crystals, wherein the film has, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
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5. A optical information storage medium which includes a visibly absorbing, optically bleachable inorganic film disposed on a support for the film, said film:
- (a) comprising multiple polycrystalline silver chloride layers which comprise crystals of additively colored silver chloride;
(b) having a thickness not exceeding about 2 microns; and
(c) having, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
- (a) comprising multiple polycrystalline silver chloride layers which comprise crystals of additively colored silver chloride;
- 6. An optical information storage medium which includes a multilayer photosensitive inorganic film disposed on a film support, said film having a thickness not exceeding about 2 microns, comprising alternating layers of PbO and AgCl, and including at least three AgCl layers comprising additively colored AgCl crystals, wherein the film has, in the optically unbleached state, a light transmittance at 6300 A not exceeding about 0.3 and a light transmittance at 8500 A of at least about 0.5.
Specification