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US 4,396,701 AGranted
Highly absorptive dye-containing underlayer for laser recording and data storage media
AssigneeDrexler Technology Corporation
InventorEric W. Bouldin
Life of this patent
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AssigneeDrexler Technology Corporation
InventorEric W. Bouldin
Estimating the term…
An underlayer for a laser recording and data storage medium with a light absorption characteristic suited to a recording laser. The underlayer is formed by creating a nuclei layer in a silver-halide photosensitive emulsion layer and then contacting the emulsion layer with a chromogenic reducing agent and a chromogenic dye coupler. The reflective layer may be formed prior to this step by subjecting the nuclei layer to a monobath having a silver-halide solvent and a silver reducing agent until a reflective surface layer of non-filamentary silver particles is formed, or after the step by chemical vapor deposition or sputtering of a reflective metal layer over the underlayer.
A reflective laser recording and optical data storage medium comprising,
A reflective laser recording and optical data storage medium comprising a substrate supporting a light-absorptive colloid matrix layer covered by a vapor-deposited reflective metal layer, said colloid matrix layer composed of black filamentary silver particles and in situ-formed light-absorptive organic dye molecules.
A reflective laser recording and optical data storage medium consisting of a thin reflective metal surface layer on an underlayer of colloid on a substrate in which the underlayer comprises light-absorptive black filamentary silver particles and in situ-formed organic dye molecules with an optical density gradient highest proximate to the reflective surface layer.
Dependencies are inferred from the claim text.