| 摘要 |
PROBLEM TO BE SOLVED: To enable application to a high density optical disk system employing blue color semiconductor laser by using an organic coloring matter compound indicated by a specific formula in a recording layer. SOLUTION: An organic coloring matter compound indicated by formula I and/or formula II is used in a recording layer. In the formula, R1 indicates a hydrogen atom or cyano group, R2 indicates a 1-12C alkyl group that may have a halogen atom, a nitro groups, and a substituent, an alkoxy group that may have a substituent, and an alkyl amino group that may have an amino group or a substituent R3 indicates a carboxyl group or a carboxylic ester group, and R4 , R5 , R6 , R7 , and R8 are same or different, indicating hydrogen atom, at least one kind of a group selected from a group consisting of a 1-8C alkyl groups of that may have a substituent, an aryl group that may have a substituent, an alkyl amino groups that may have an amino group and a substituent, an acetyl group, an acetyl amino group, a hydroxyl group, and carboxyl group. |
