Patent ID: 6841217
Filing Date: 2005-01-11
Classification: G11B,Y10T

Abstract:
1. An optical information recording medium including a substrate and an information layer, the information layer comprising: a first dielectric film that contains Cr, O and at least one element (M1) selected from Zr and Hf; a recording film that is provided on the first dielectric film and changed in optical property reversibly by irradiation of laser beams; and a second dielectric film that is provided on the recording film and contains Cr, O and the at least one element (M1) selected from Zr and Hf, which are provided in this order from a side on which laser beams are incident, wherein the first dielectric film has a Cr atom concentration of at least 6 at %, the second dielectric film has a Cr atom concentration of at least 9 at %, and the Cr atom concentration of the second dielectric film is larger than the Cr atom concentration of the first dielectric film.