Patent ID: 7876667

Claim:
An optical information recording medium which records and enables reproduction of information by irradiation of light, comprising: a substrate; a pit pattern film formed on said substrate in which a plurality of pits comprised of a phase change material, which melt by irradiation of a recording light and irradiation of a reproducing light, are aligned regularly; and a recording film formed on said pit pattern film; wherein a recording mark is formed in the recording film by irradiation of the recording light through a molten pit of the pit pattern film, wherein |R 3 −R 5 | which is a difference between a reflectance R 3 of a region where said pit is molten and a recording mark is not being recorded on said recording film, and a reflectance R 5 of a region where said pit is molten and a recording mark is being recorded on said recording film, is greater than |R 2 −R 4 | which is a difference between a reflectance R 2 where said pit is not molten and a recording mark is not being recorded on said recording film, and a reflectance R 4 where said pit is not molten and a recording mark is being recorded on said recording film.