Patent ID: 7960006

Claim:
An optical recording medium comprising: a substrate; a first information layer which is provided on the substrate on a side of a light incident surface on which a laser beam is incident; at least one translucent information layer which is provided further on the side of the light incident surface than the first information layer; and a spacer layer being provided between the first information layer and the translucent information layer, wherein the translucent information layer is configured to include a first dielectric layer, a reflective layer, a protective layer, a recording film, an interface layer provided adjacent to the recording film on the side of the light incident surface, and a second dielectric layer, which are formed in this order from the spacer layer side, the recording film which is made of a phase change material having Sb x Te y Ge z elements and specific elemental ratios, the y holds 5≦y≦15, z holds 5≦z≦15, NA represents the numerical aperture of an objective lens, and λ represents a wavelength of the laser beam, the recording film is rewritable using an optical system of λ/NA≦650 nm, when x+y+z+a=100 holds by adding In with an elemental ratio of a, 4≦a≦15 holds, and the translucent information layer is provided with a heat sink layer on the side of the light incident surface of the second dielectric layer.