Patent ID: 6406771
Filing Date: 2002-06-18
Classification: G11B,Y10T

Abstract:
An optical recording medium, that allows information to be recorded, erased and reproduced by laser beam irradiation, and in which the recording and erasure of information are achieved by reversible phase change between the amorphous phase and the crystalline phase, characterized in that at least a first dielectric layer, a first boundary layer, a recording layer, a second boundary layer, an absorption correction layer and a reflection layer are provided in this order on a substrate, that the composition of said recording layer is represented by general formula[{(Ge1âˆ’kSnk)0.5Te0.5}x(Sb0.4Te0.6)1âˆ’x]1âˆ’yâˆ’zSbyAz (where A denotes an element selected from the elements belonging to the group 3 through group 14 of the 3rd period through 6th period of the periodic table excluding Ge, Sb and Te), that x, y, z and k are in the ranges respectively represented by the following formulae (1) or (2)0.5&lE;x&lE;0.95, 0&lE;y&lE;0.08, 0&lE;z&lE;0.2, k=0â€ƒâ€ƒ(1) 0.5&lE;x&lE;0.95, 0.01&lE;y&lE;0.08, z=0, 0&lE;k&lE;0.5â€ƒâ€ƒ(2) that the first boundary layer and the second boundary layer are respectively mainly composed of at least one selected from carbon, carbides, oxides and nitrides, and that the absorption correction layer is 1.0 to 4.0 in refractive index and 0.5 to 3.0 in attenuation coefficient.