Method for photographic replication of information on an...

Details Method for photographic replication of information on an... Method for photographic replication of information on an...

G - Physics

03

C

352/32.4

G03C 1/76 (2006.01) B41M 5/24 (2006.01) G03C 8/06 (2006.01) G11B 7/013 (2006.01) G11B 7/241 (2006.01) G11C 13/04 (2006.01)

Patent

CA 1134949

ABSTRACT A method of replicating data from a master transmissive optical data storage medium whereby the resulting pro- duct displays areas of low reflectivity and high re- flectivity. Actinic radiation is shone through trans- missive areas onto a silver-halide emulsion photo- sensitive medium. The photosensitive medium is then chemically developed black. Next, the developed medium is fogged to create a latent image layer of silver pre- cipitating nuclei. Finally, the fogged medium is placed in a monobath comprising a weak silver-halide reducing agent and a rapid-acting silver-halide solvent for partial chemical development and substantial physical development. The resulting product displays areas of low reflectivity, which correspond to the transmissive areas of the master, in a reflective field.

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