JP2006236544A5 - - Google Patents

Claims (12)

The substrate has at least a phase change recording layer and an inorganic protective layer in contact with the layer. The inorganic protective layer contains a metal oxide α as a main component, and the metal oxide α is a non- oxidized metal element and / or or comprises a metal oxide in a state oxidation number is not the maximum, and the complex refractive index n + ik at wavelength lambda = 660 nm an optical recording medium, characterized in that satisfies the following equation (1).
2.0 ≦ n ≦ 4.0, 0 ≦ k ≦ 1.0 (1)   2. The optical recording medium according to claim 1, wherein the element constituting the metal oxide α is Ge and / or Si.   3. The light according to claim 1, wherein at least a first protective layer, a phase change recording layer, a second protective layer, and a reflective layer are laminated on a substrate, and the second protective layer is the inorganic protective layer. recoding media.   On the substrate, at least a first protective layer, a phase change recording layer, a second protective layer, and a reflective layer are sequentially laminated, and the inorganic protective layer is provided between the phase change recording layer and the second protective layer. The optical recording medium according to claim 1 or 2. The optical recording medium according to claim 3 or 4, wherein the first protective layer and / or the second protective layer contains a mixture of ZnS and SiO ₂ as a main component.   6. The optical recording medium according to claim 3, wherein the reflective layer contains Ag or an Ag alloy as a main component.   7. The optical recording medium according to claim 6, wherein an anti-sulfurization layer composed of a component not containing sulfur is provided between the reflective layer and the second protective layer.   The optical recording medium according to claim 1, wherein the phase change recording layer contains Sb as a main component. 9. The optical recording medium according to claim 1 , wherein the phase change recording layer contains at least one element selected from Ge, Ga, and In containing Sb as a main component.   The optical recording medium according to claim 9, wherein the phase change recording layer further contains Te.   11. The optical recording medium according to claim 9, wherein the phase change recording layer further contains Sn.   12. The substrate according to claim 1, wherein the substrate has meandering grooves having a track pitch of 0.74 ± 0.03 μm, a groove depth of 22 to 40 nm, and a groove width of 0.2 to 0.3 μm. Optical recording medium.