Patent ID: 7504197
Filing Date: 2009-03-17
Classification: G11B,Y10S

Abstract:
1. An optical information recording medium comprising a substrate having provided thereon a recording layer capable of recording information by laser beam irradiation, wherein the recording layer contains, as a major component, a non-metal azo dye represented by the following general formula (I): wherein R 1 , R 2 , R 3 and R 4 each independently represents a hydrogen atom or a substituent group; R 5 and R 6 each independently represents a hydrogen atom or a substituent group; and B represents a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group, which are derivable from a diazonium salt, wherein the optical information recording medium has an improved recording and reproducing property with a laser beam having a wavelength ranging from 390 to 415 nm, and wherein a surface of said substrate to which said recording layer is provided has pregrooves.