Patent ID: 7414954

Claim:
An information recording method comprising providing an phase-change optical information recording medium in which information can be recorded, reproduced and rewritten, said medium comprising a first transparent substrate having a wobbling groove which is spirally formed thereon at a pitch; a first dielectric layer located overlying the first transparent substrate and having an optical thickness of from 80 nm to 200 nm; a phase-change recording layer located overlying the first dielectric layer and having an optical thickness of from 20 nm to 50 nm when the phase-change recording layer is in an erased state; a second dielectric layer located overlying the phase-change recording layer and having an optical thickness of from 10 nm to 70 nm; a reflection layer located overlying the second dielectric layer; and a second transparent substrate located overlying the reflection layer; and recording a record mark in the phase-change recording layer, wherein the record mark has a width of from 0.9 to 1.5 times that of a width of the wobbling groove.