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Broadband reflective laser recording and data storage medium with absorptive underlayer

  • US 4,284,716 A
  • Filed: 04/14/1980
  • Issued: 08/18/1981
  • Est. Priority Date: 07/06/1979
  • Status: Expired due to Term
First Claim
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1. A reflective data recording medium comprising,a colloid matrix underlayer disposed on a substrate, said underlayer having primarily filamentary silver particles therein characterized by an optical density to red light between 0.2 and 3.0, and absorptive of visible and infrared light, anda reflective surface layer primarily of non-filamentary individual silver particles in said colloid matrix, said reflective surface layer disposed atop said underlayer, having maximum silver particle dimensions primarily under 0.05 microns, some of which are aggregated with similar particles, and having a volume concentration of silver particles greater in said surface layer than in said colloid matrix underlayer, said reflective surface layer having at least one area having substantially uniform reflectivity, said uniform reflectivity being between 10% and 75%.

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