Organic dye-in-polymer (DIP) medium for write-once-read-many (WORM) optical discs
AssigneeIndustrial Technology Research Institute
InventorsHun-Jan Tao, Hwa-Fu Chen
Life of this patent
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Abstract
A dye containing solution composition for use in forming optical recording media comprises about 0.1 to about 5 parts cyanine dye; about 0.1 to about 5 parts polyvinyl acetate resin and about 100 to about 90 parts co-solvents. The dye containing solution is applied to a substrate of an optical recording medium by a spin coating process to form a recording layer having a uniform thickness. The resultant optical recording medium is suitable for reading and writing with a laser beam.
Claims15
A dye-in-polymer composition for use in forming an optical recording layer comprising:
- a cyanine dye;
- polyvinyl acetate;
- and
- a co-solvent solution including a first solvent comprising 2-ethoxyethanol for wetting a surface of a substrate and about 10 to about 50 percent-by-weight of a second solvent for increasing an evaporation rate of the composition, wherein the second solvent is an alcohol which has a boiling point less than 100.degree. C.
A dye containing solution composition for use in forming an optical recording medium comprising:
- about 0.1 to about 5 parts cyanine dye;
- about 0.1 to about 0.01 parts singlet oxygen quencher;
- about 0.1 to about 5 parts polyvinyl acetate resin;
- and
- about 100 to about 90 parts co-solvent, wherein the solubility of the cyanine dye in said co-solvent is at least 1 percent by weight and the co-solvent is a mixture of about 10 to about 50 percent by weight alcohols having boiling point lower than about 100.degree. C. and about 90 to about 50 percent by weight 2-ethoxyethanol.
A method of forming an optical recording layer on a surface of a substrate, comprising:
- mixing about 0.1 to about 5 parts cyanine dye with about 0.1 to about 5 parts polyvinyl acetate, about 0.1 to about 0.01 parts singlet oxygen quencher to form a dye composition mixture, and about 100 parts to about 90 parts co-solvent which includes 2-ethoxyethanol as a first solvent for wetting the surface of the substrate and an alcohol having a boiling point of less than about 100.degree. C. as a second solvent for increasing an evaporation rate of the co-solvent;
- and
- applying the dye composition mixture to a surface of the substrate by spin coating.
An optical storage system for optically storing information, comprising:
- a substrate having an information carrying surface;
- a layer of a dye-in-polymer composition coated on the information carrying surface of the substrate, wherein the dye-in-polymer composition is coated with a composition comprising:
- about 0.1 to about 5 parts cyanine dye;
- about 0.1 to about 0.01 parts singlet oxygen quencher;
- about 0.1 to about 5 parts polyvinyl acetate resin;
- and
- about 100 to about 90 parts co-solvent, wherein the solubility of the cyanine dye is said co-solvent is at least 1 percent by weight and the co-solvent is the mixture of about 10 to about 50 percent by weight alcohols having boiling points lower than about 100.degree. C. and about 90 to about 50 percent by weight 2-ethoxyethanol;
- a radiation source for directing radiation on the information carrying surface of the substrate;
- and
- a radiation sensor for detecting radiation reflected from the information carrying surface of the substrate wherein pits in the layer of dye on the information carrying surface of the substrate are representative of stored information.
Dependencies are inferred from the claim text.