Patent ID: 8034426
Filing Date: 2011-10-11
Classification: G11B,Y10T

Abstract:
1. A two-layered optical recording medium comprising: a first substrate, a first information layer, a second information layer, and a second substrate, formed in this order as viewed from a light beam irradiation side, wherein the first information layer is configured for a recording light beam that is a laser beam having a wavelength in a range of 650 nm to 660 nm, applied through the light beam irradiation side, the first information layer comprises a first lower dielectric layer, a first recording layer, a first upper dielectric layer, a first reflective layer, and an inorganic dielectric layer formed in this order as viewed from the light beam irradiation side, the second information layer comprises a second lower dielectric layer, a second recording layer, a second upper dielectric layer, and a second reflective layer formed in this order as viewed from the light beam irradiation side, and the first reflective layer comprises Cu with a content of 99.8% by mass to 95.0% by mass and one or more metals selected from the group consisting of Ta, Nb, Cr, Ge and Mo and has a thickness of 4 nm to 12 nm.