Patent number: 6306478
Abstract: An optical recording layer of an optical recording medium comprises a dye material represented by the formula (I),
wherein
R1 is a hydrogen atom, a methyl group, or an ethyl group,
R2 and R3 each is, independent from each other, a substituted or unsubstituted C1 to C12 alkyl group,
A⊖ is an anion selected from the group consisting of halogen atoms, ClO4⊖, BF4⊖, PF6⊖, SbF6⊖, CF3SO2⊖, C2F5SO3⊖, CF3COO⊖, and CH3C6H4SO3⊖,
X is hydrogen, alkyl, alkoxy, halogen, nitro, or fused benzene,
Y is hydrogen, alkoxy, halogen, alkyl, aryl, alkoxycarbonyl, aryloxycarbonyl, alkylamine, arylamine, alkylamide, arylamide, alkylsulfonyl, aryl sulfonyl, alkoxysulfonyl, aryloxysulfonyl, nitro, or cyano groups.
Type:
Grant
Filed:
January 6, 2000
Date of Patent:
October 23, 2001
Assignee:
Ritek Corporation
Inventors:
Hui-jen Chen, Chang-sheng Huang, Mei-jung Hu, Yi-shiu Lin, Shyh-yeu Wang, Chwei-jin Yeh