Patent ID: 7048983

Claim:
A phase-change optical information recording medium in which information can be recorded, erased and read, comprising: a substrate; and a recording layer located overlying the substrate and achieving a crystal phase and an amorphous phase, wherein the recording layer satisfies the following relationship: Ac<Aa wherein Ac represents an absorptance of the recording layer in the crystal phase against light having a wavelength of from 370 nm to 450 nm and Aa represents an absorptance of the recording layer in the amorphous phase against the light having a wavelength of from 370 nm to 450 nm; wherein information is recorded in the recording layer with light having a wavelength of from 370 nm to 450 nm at a recording density of 0.05 μm/bit to 0.16 μm/bit; and wherein the reflectance is from 12 to 24%.