Optical information recording medium, and substrate and manufacturing method for the optical information recording medium

摘要

An optical information recording medium is provided and comprises a substrate formed with a first area having sinusoidally deflected grooves and address pits having a constant length scattered and allocated between said grooves and a second area having sinusoidally deflected pit arrays and address pits having a constant length scattered and allocated between said pit arrays; and a recording layer having reflectivity of more than 15% being composed of at least a rewritable phase change material, the optical information recording medium has a recording mark of said first area recorded by being modulated in an area allocated on said sinusoidally deflected grooves in said recording layer. An output value (APb) of address pit signal component occupying in a reproduced signal under a not recorded condition in said area is within a range of 0.18 to 0.27. The first and second track pitch are equal, and the shortest mark length and shortest pit length are equal. A method of reproducing an optical information recording medium is also provided wherein said optical information recording medium is reproduced by irradiating the laser beam only on said grooves through an objective lens.