Laser pyrographic reflective recording layer in a carbon containing absorptive matrix
First Claim
1. An information storage medium for pyrographically recording laser writing comprising a reflective surface coating of at least 15% reflectivity disposed on a sheet substrate, the reflective coating comprising reflective silver particles distributed within a gelatin matrix.
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Accused Products
Abstract
A recording medium for laser writing and a method of making same wherein a silver-halide emulsion coating disposed on a substrate is strongly exposed to actinic radiation and then developed, or otherwise processed for maximum blackness. The black opaque emulsion is converted to a reflective recording medium by heating at least to 270° C. in an oxygen containing environment until the emulsion coating assumes a shiny reflective appearance and the gelatin partially pyrolyzes creating a carbon containing absorptive matrix. Prior to developing, patterns may be photographically imposed on the medium to provide control indicia for the recording system or data base information to a playback system or to provide a means of replicating master recordings.
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Citations
36 Claims
- 1. An information storage medium for pyrographically recording laser writing comprising a reflective surface coating of at least 15% reflectivity disposed on a sheet substrate, the reflective coating comprising reflective silver particles distributed within a gelatin matrix.
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5. In laser pyrographic information recording and storage, the recording and storage medium comprising,
a sheet substrate capable of withstanding temperatures of at least 270° - C., said substrate supporting a photographic gelatin coating, said gelatin coating having silver particles distributed within a gelatin matrix, said gelatin matrix optically characterized by a surface reflective silver component of at least 15% reflectivity thereon and an underlying reddish or amber color derived from unreacted carbon molecules.
- View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 24, 25, 26, 27)
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19. A method of making a laser pyrographic information and storage medium comprising,
photographically processing a silver-halide gelatin coating on a substrate to blackness, and thermally converting said black photographically processed silver-halide gelatin coating by heating at least to 270° - in an atmosphere having a substantial percentage of oxygen at least until a reflective component of at least 15% reflectivity appears on the emulsion coating.
- View Dependent Claims (20, 21, 22, 23, 28, 29, 30, 31, 32, 33, 34, 35, 36)
Specification