Patent ID: 7439008
Filing Date: 2008-10-21
Classification: C09B,G11B,Y10S

Abstract:
1. An optical recording medium comprising: a grooved substrate wherein a guide groove has a depth of 100 nm to 250 nm, and at least a recording layer disposed on the substrate in which the recording layer comprises at least one type of formazan-metal chelate dyes represented by the following formula (1): wherein a ring “α”represents any one of a pyridazine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, a thiadiazole ring and an imidazole ring, which may be substituted by a substituent; “A”represents any one of an alkyl group which may contain a substituent, an unsubstituted aryl group, an aryl group containing another substituent than a fluorinated alkyl group, an alkenyl group which may contain a substituent and a heterocycle residue which may contain a substituent; “R ”represents one of a fluorine atom and a flourinated alkyl group; “m ”is a natural number representing the number of “R ”and when “m ”is 2 or more, “R”s may be the same or different from each other; “M”represents one of a metal atom and a metal compound; and “n”represents the number of a formazan ligand coordinating “M”and is one of 1, 2, and 3.