Patent ID: 6291045
Filing Date: 2001-09-18
Classification: G11B,Y10S,Y10T

Abstract:
An optical information recording medium comprising a substrate on which a recording layer including a dye layer is formed; which is characterized in that said dye layer contains a trimethine-based cyanine dye represented by the following general formula [1]; and that said recording layer enables a recording and reading to be effected with a laser beam having a wavelength falling within a range of 620 nm to 690 nm; and that an absorbance ratio (h2/h1) of the second peak h2 to the main peak h1 as measured of the absorption spectrum of the recording layer (the wavelength dependency of the absorbance under a wavelength ranging from 400 to 800 nm) by making use of a visible ultraviolet spectrometer is less than 0.8: ##STR13##wherein ""A"" represents any one of the following general formulas [2], [3], [4] and [5]; ##STR14##""A'"" represents any one of the following general formulas [6], [7], [8] and [9]; ##STR15##""A"" and ""A'"" may be the same or different from each other (where m and n respectively represents an integer of 1 or more); R and R' may be the same or different from each other and are individually substituted or unsubstituted alkyl, carboxyl, alkoxycarbonyl, alkylcarboxyl, alkoxyl, alkylhydroxyl, aralkyl, alkenyl, alkylamide, alkylamino, alkylsufonamide, alkylcarbamoyl, alkylsulfamoyl, hydroxyl, halogen atoms, alkylalkoxyl, alkyl halide, alkylsulfonyl, alkylcarboxyl or alkylsulfonyl which are bonded to a metallic ion or alkyl, phenyl, benzyl, alkylphenyl, or phenoxyalkyl group (the hydrogen atom in the benzene ring portion and/or alkyl group portion may be substituted by a substituent group other than a metallic ion, such as alkyl, carboxyl, hydroxyl and a halogen atom); and X- is an anion selected from the group consisting of halogen atoms, PF6-, SbF6-, H3P04, perchloric acid, hydroborofluoric acid, benzenesulfonic acid, toluenesulfonic acid, alkylsulfonic acid, benzenecarboxylic acid, alkylcarboxylic acid, trifluoromethylcarboxylic acid, periodic acid, SCN-, tetraphenyl borate and tungstic acid.