Patent ID: 7014904

Claim:
An optical information recording medium, comprising at least two information layers on a substrate; wherein the information layer disposed at a laser incident side includes at least a reflection layer, a recording layer disposed at the laser incident side with respect to the reflection layer that serves to generate a reversible change between an amorphous phase and a crystalline phase that can be detected optically by applying a laser beam, and a dielectric layer disposed between the reflection layer and the recording layer; the dielectric layer contains at least Zr, Si and Cr; a ratio of Zr, Si and Cr of the dielectric layer at the reflection layer side is expressed as Zr:Si:Cr=p:q:r (p+q+r=100, and p, q, r are in at %); a ratio of Zr, Si and Cr of the dielectric layer in the vicinity of the interface at the recording layer side is expressed as Zr:Si:Cr=s:t:u (s+t+u=100, and s, t and u are in at %); and r is less than u.