Optical information recording medium

摘要

A phase-change optical information recording medium in which information can be recorded, reproduced and rewritten and which includes a first transparent substrate (1) having a wobbling guide groove which is spirally formed thereon at a pitch; a first dielectric layer (2) located overlying the first transparent substrate (1) and having an optical thickness of from 80 nm to 200 nm; a phase-change recording layer (3) located overlying the first dielectric layer (2) and having an optical thickness of from 20 to 50 nm when the recording layer (3) is in an erased state; a second dielectric layer (4) located overlying the recording layer (3) and having an optical thickness of from 10 nm to 70 nm; a reflection layer (5) located overlying the second dielectric layer (4); optionally a third dielectric layer (4') located between the second dielectric layer (4) and the reflection layer (5); and a second transparent substrate (1') located overlying the reflection layer (5).