Optical recording system
AssigneeHewlett-Packard Development Company, L.P.
InventorMakarand Gore
Life of this patent
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Abstract
Systems and method for optically recording data. One system comprises a disc comprising a substrate and a markable coating on said substrate, the markable coating having a thickness less than 1 μm and comprising: a matrix; and a color-forming agent included in the matrix and comprising a leuco dye and developer; wherein the leuco dye is selected to change from high reflectance of radiation with wavelengths between 400 and 500 nm to low reflectance of radiation with wavelengths between 400 and 500 nm when activated by the application of energy above a threshold level; and a marking light source positioned so as to illuminate the disc in a desired manner.
Claims19
An optical recording system, comprising:
- a disc comprising a substrate and a markable coating on said substrate, said markable coating having a thickness less than 1 μm and comprising:
- a matrix;
- and
- a color-forming agent included in the matrix and comprising a leuco dye and developer;
- wherein said leuco dye is selected to change from high reflectance of radiation with wavelengths between 400 and 500 nm to low reflectance of radiation with wavelengths between 400 and 500 nm when activated by the application of energy above a threshold level;
- and
- a marking light source positioned so as to illuminate said disc in a desired manner.
A method of making an optical data recording medium, comprising:
- a) providing a substrate;
- and
- b) providing a markable coating on said substrate, said markable coating comprising:
- a matrix;
- and
- a color-forming agent included in the matrix and comprising a leuco dye and developer;
- wherein said leuco dye is selected to change from high reflectance of radiation with wavelengths between 400 and 500 nm to low reflectance of radiation with wavelengths between 400 and 500 nm when activated by the application of energy above a threshold level.
Apparatus for recording optical data, comprising
- an optical data recording medium comprising a substrate and a markable coating on said substrate, said markable coating comprising:
- a matrix;
- and
- a color-forming agent included in the matrix and comprising a leuco dye and developer;
- wherein said leuco dye is selected to change from high reflectance of radiation with wavelengths between 400 and 500 nm to low reflectance of radiation with wavelengths between 400 and 500 nm when activated by the application of energy above a threshold level;
- and
- a recording device comprising a light source.
Dependencies are inferred from the claim text.