| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic pigment type optical recording medium capable of being recorded and reproduced by blue semiconductor laser beam. SOLUTION: The recording layer contains a pigment represented by general formula (1) (wherein, R1 is -NR2R3, -OR4 or -SR5, R6 is a hydrogen atom, an alkyl group with may be substituted, an alkenyl group which may be substituted, an aryl group which may be substituted, a heterocyclic group which may be substituted, -OR7 or -NR8R9, a ring A may further have a substituent other than -R1 and -CXR6 and X is an oxygen atom or a sulfur atom). |
