JP2004133979A5 - - Google Patents

Claims (5)

  Light that records and reproduces information by sequentially forming a reflective layer, a first protective layer, a recording layer, and a second protective layer on a substrate and entering light having a wavelength of 400 nm to 410 nm from the second protective layer side A recording medium, wherein the recording layer is made of a phase change material mainly composed of Sb and Te, the reflectance of the optical recording medium before information recording is 8% to 35%, and the optical recording medium The optical recording medium is characterized in that the reflectance of the information recording portion is lower than the reflectance before the information recording.   The film thickness of the first protective layer is 10 nm to 25 nm, the film thickness of the recording layer is 10 nm to 20 nm, and the film thickness of the second protective layer is 30 nm to 50 nm. Item 4. The optical recording medium according to Item 1. 2. The optical recording medium according to claim 1, wherein the first protective layer and the second protective layer contain at least one selected from the group consisting of Zn, S, Si, O, and N. 3. The optical recording medium according to claim 1, wherein the recording layer is made of a phase change material further including at least one selected from the group consisting of Ga, Bi, Sn, B, and Si. The optical recording medium according to claim 1, wherein the reflective layer is made of Ag or an Ag alloy.