Method for photographic replication of information on an optical data storage medium
First Claim
1. A negative photographic process for replicating data from a master optical data storage medium, comprising,orienting a major surface of a fine-grained silver-halide emulsion photosensitive medium in a reference plane,aligning an opaque master optical data storage medium having lighttransmissive areas in a plane parallel to the major surface of the photosensitive medium, in a non-contacting projection relationship therewith,projecting actinic radiation through said light-transmissive areas of the master, thereby forming silver latent image areas in the photosensitive medium corresponding to said light-transmissive areas,chemically developing said silver latent image areas of the photosensitive medium, thereby forming dark, filamentary, low reflective silver areas corresponding to said light-transmissive areas of the master,forming an areawise layer of silver precipitating nuclei by chemical fogging or by exposure to actinic radiation at the major surface of the silver-halide emulsion in the unexposed and undeveloped region of the photosensitive emulsion,depositing nonfilamentary silver on said nuclei by silver diffusion transfer from said unexposed and undeveloped region, said silver particles being adsorbed on the nuclei, thereby forming an areawise high reflective field in areas corresponding to opaque areas of said master.
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Accused Products
Abstract
A method of replicating data from a master transmissive optical data storage medium whereby the resulting product displays areas of low reflectivity and high reflectivity. Actinic radiation is shone through transmissive areas onto a silver-halide emulsion photosensitive medium. The photosensitive medium is then chemically developed black. Next, the developed medium is fogged to create a latent image layer of silver precipitating 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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Citations
16 Claims
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1. A negative photographic process for replicating data from a master optical data storage medium, comprising,
orienting a major surface of a fine-grained silver-halide emulsion photosensitive medium in a reference plane, aligning an opaque master optical data storage medium having lighttransmissive areas in a plane parallel to the major surface of the photosensitive medium, in a non-contacting projection relationship therewith, projecting actinic radiation through said light-transmissive areas of the master, thereby forming silver latent image areas in the photosensitive medium corresponding to said light-transmissive areas, chemically developing said silver latent image areas of the photosensitive medium, thereby forming dark, filamentary, low reflective silver areas corresponding to said light-transmissive areas of the master, forming an areawise layer of silver precipitating nuclei by chemical fogging or by exposure to actinic radiation at the major surface of the silver-halide emulsion in the unexposed and undeveloped region of the photosensitive emulsion, depositing nonfilamentary silver on said nuclei by silver diffusion transfer from said unexposed and undeveloped region, said silver particles being adsorbed on the nuclei, thereby forming an areawise high reflective field in areas corresponding to opaque areas of said master.
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9. A negative photographic process for replicating data from a master optical data storage medium, comprising,
orienting a major surface of a fine-grained silver-halide emulsion photosensitive medium in a reference plane, aligning an opaque master optical data storage medium having light-transmissive areas in a plane parallel to the major surface of the photosensitive medium, in a non-contacting projection relationship therewith, projecting actinic radiation through said light-transmissive areas of the master, thereby forming silver latent areas in the photosensitive medium corresponding to said light-transmissive areas, chemically developing said silver latent image areas of the photosensitive medium, thereby forming dark filamentary, low reflective silver areas corresponding to said light-transmissive areas of the master, forming an areawise layer of silver precipitating nuclei at the major surface of the silver-halide emulsion in the unexposed and undeveloped region of the photosensitive emulsion, contacting said nuclei layer in the photosensitive medium with a reagent comprising a weak silver-halide developing agent for partial chemical development of said layer of silver precipitating nuclei and a rapid-acting silver-halide complexing solvent for reacting with unexposed and undeveloped silver-halide to form soluble silver ion complexes which are transported by diffusion transfer to said chemically developed nuclei where silver of said silver ion complexes is precipitated and adsorbed on said chemically developed nuclei in the presence of said developing agent acting as a reducing agent, thereby forming a high reflective, electrically nonconducting layer of aggregated and individual silver particles, the activity of solvent being sufficiently low to permit partial chemical development of said surface latent image by the weak developing agent before all of the undeveloped and unexposed silver-halide is dissolved where high reflective area is located in areas corresponding to opaque areas of said master.
Specification