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Process for making a reflective data storage medium

  • US 4,278,758 A
  • Filed: 09/06/1979
  • Issued: 07/14/1981
  • Est. Priority Date: 07/06/1979
  • Status: Expired due to Term
First Claim
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1. A method of making a reflective electrically non-conducting data storage medium comprising,forming an areawise, latent image exposure in a photosensitive silver-halide emulsion layer disposed on a substrate, thereby defining an area for data storage, said exposure creating an areawise layer of silver precipitating nuclei having a volume concentration gradient through the depth of the emulsion, said emulsion having unexposed photosensitive silver-halide remaining therein in concentrations inversely related to said nuclei concentration,contacting said unexposed photosensitive silver-halide emulsion layer with an aqueous monobath comprising a weak silver-halide developing agent for developing said latent image and a rapid-acting silver-halide solvent for reacting with unexposed and undeveloped silver halide to form soluble silver ion complexes which are transported by chemical diffusion transfer to said silver-precipitating nuclei of said latent image where silver of said silver ion complexes is precipitated and adsorbed on said nuclei in the presence of said developer acting as a reducing agent, thereby forming a reflective electrically non-conducting silver negative of said latent image in said area for data storage, andheating said reflective electrically non-conducting data storage medium at least to 250°

  • C. until the reflectivity of the surface increases by at least 5% of the initial reflectivity percentage.

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