Patent ID: 7364781
Filing Date: 2008-04-29
Classification: G11B,Y10T

Abstract:
1. An optical recording medium comprising a recording layer which comprises a phase-change recording material which is capable of performing a reversible phase change from a crystalline phase to an amorphous phase and vice versa by light irradiation of said phase-change recording material, said recording layer being capable of writing information therein, reading written information therefrom, and rewriting written information by utilizing said reversible phase change of said phase-change recording material, wherein when a recording mark formed in said recording layer is repeatedly read 5000 times, using a continuous wave laser beam having such an intensity Pr that satisfies the condition of 1.1≦R≦2.0, in which R is the ratio of a 5000 said optical recording medium satisfies a relationship of d wherein said phase-change recording material comprises a pseudo binary composition which has an X-ray diffraction spectrum such that a first peak is observed at a Bragg (2θ) angle of 27° to 29° and a second peak is observed at a Bragg (2θ) angle of 40° to 43° when a CuKα line having a wavelength of 1.54Å is used, wherein the second peak is wider than the first peak, wherein said pseudo binary composition is represented by Sb-TeM, comprising two portions, one portion being represented by Sb, and the other portion being represented by TeM, in which M represents a metal compound comprising at least Sb or Ge, provided that when TeM is Sb