Patent ID: 8642152

Claim:
An optical information recording medium comprising: a substrate; a plurality of information signal layers provided on the substrate; and a cover layer provided on the information signal layers, wherein a surface of one of a side of the substrate and the cover layer is a light irradiation plane on which light for recording information signals on the two or more information signal layers is irradiated, wherein a plurality of the information signal layers other than an information signal layer at a deepest portion from the light irradiation plane include: an inorganic recording layer that includes a W oxide and a Pd oxide, a first protective layer that is provided on a first principal plane of the inorganic recording layer, and a second protective layer that is provided on a second principal plane of the inorganic recording layer, wherein for a first information signal layer other than the information signal layer at the deepest portion from the light irradiation plane, at least one of the first protective layer and the second protective layer is a layer with an extinction coefficient of 0.05 to 0.6, and wherein for a second information signal layer other than the information signal layer at the deepest portion from the light irradiation plane, and closer to the light irradiation plane relative to the first information signal layer, at least one of the first protective layer and the second protective layer is a layer with an extinction coefficient of 0.