Patent ID: 6842419

Claim:
An optical information recording medium capable of recording/reproducing information upon being irradiated with a light beam, comprising: a substrate; a light incident surface; a first information recording layer formed between said substrate and said light incident surface to transit between a crystal state and an amorphous state upon being irradiated with the light beam; and a second information recording layer formed between said substrate and said first information recording layer to transit between the crystal state and the amorphous state upon being irradiated with the light beam, wherein said first information recording layer comprises sequentially from a side of said light incident surface to a side of said substrate, a recording film, a first dielectric film whose complex index has a real part n 1 , a second dielectric film whose complex index has a real part n 2 , and a third dielectric film whose complex index has a real part n 3 , and relationships n 1 >n 2 and n 3 >n 2 are satisfied.