Laser pyrographic reflective recording medium

Details Laser pyrographic reflective recording medium Laser pyrographic reflective recording medium

G - Physics

11

B

352/32.4

G11B 7/00 (2006.01) G03C 5/40 (2006.01) G11B 7/0045 (2006.01) G11B 7/013 (2006.01) G11B 7/251 (2006.01) H04N 5/76 (2006.01)

Patent

CA 1143475

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 black- ness. The black opaque emulsion is converted to a reflective recording medium by heating at least to 250° C in an oxygen containing environment until the emulsion coating assumes a shiny reflective appearance. 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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