Optical information recording medium, and substrate and manufacturing method for the optical information recording medium
In an optical disk including at least a rewritable phase change material and comprising a recording layer having a reflectivity of more than 15%, an address output value as an address pit signal component occupying in a reproduced signal in a non recording state is prescribed to be 0.18 though 0.27 or a numerical aperture of an address pit signal occupying in a reproduced signal in a non recording state is prescribed to be more than 0.3.
1. An optical information recording medium comprising:
a substrate formed with an area having grooves,
a recording layer being recordable by a laser beam, and
a transmission layer being transparent to a laser beam and having a thickness of 0.1 mm and having a refractive index,
wherein a push-pull signal output reproduced from grooves is more than 0.22.
2. A reproducing apparatus for reproducing an optical information recording medium, said optical information recording medium comprising:
a substrate formed with an area having grooves,
a recording layer being recordable by a laser beam, and
a transmission layer being transparent to a laser beam and having a thickness of 0.1 mm and having a refractive index,
wherein a push-pull signal output reproduced from grooves is more than 0.22, and
wherein said reproducing apparatus further comprises a laser, an objective lens and a 4 division photo detector.