Patent ID: 8092890

Claim:
An optical information recording medium comprising a recording layer on a surface of a support, wherein: the surface of the support has pregrooves with a track pitch ranging from 50 to 500 nm, the recording layer comprises an azo metal complex dye, the azo metal complex dye is a complex of one or more azo dye and transition metal ions of which the number of transition metal ions is equal to or greater than the number of the azo dye, the azo metal complex dye comprising two or more transition metal ions per molecule, and in a molecule of the azo metal complex dye, the transition metal ions present may be identical or different from each other and plural azo dyes may be identical or different from each other when plural azo dyes are present in a molecule of the azo metal complex dye; provided that azo dyes having the partial structures (1-1) or (1-2) below are excluded: in the above, R 6 , R 7 and R 8 each independently denotes a hydrogen atom or a substituent, and * denotes a binding position with an —N═N— group; and further wherein: the transition metal ion is a copper ion; and the azo metal complex dye exhibits a result indicating that two azo dyes and two transition metal copper ions are comprised per molecule by at least one analysis selected from the group consisting of ESI-MS, MALDI-MS, and X-ray structural analysis.