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US 8,747,985 B2Granted
Optical recording medium
AssigneesSony Corporation, Kabushiki Kaisha Kobe Seiko Sho
InventorsTakeshi Miki, Yuki Tauchi
Life of this patent
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Abstract
An optical recording medium including a substrate and two or more recording layers that contain Pd, O, and M (M comprises at least one of Zn, Al, In, and Sn), where O is contained in an amount greater than a stoichiometric composition thereof when M is completely oxidized (into ZnO, Al2O3, In2O3, and SnO2). An nth recording layer of the two or more recording layers, as counted from an opposite side of an incident side of recording light, has a Pd content that is less than that of an (n−1)th recording layer.
Claims5
An optical recording medium, comprising:
- a substrate;
- and
- two or more recording layers stacked on one side of the substrate, each recording layer containing palladium (Pd), oxygen (O), and M M representing at least one of Zn, Al, In, and Sn,
- wherein,
- O is contained in an amount greater than a stoichiometric composition thereof when M is completely oxidized into at least one of ZnO, Al2O3, In2O3, and SnO2, and
- a Pd content in an nth recording layer of the two or more recording layers as counted from a side of the optical recording medium opposite a recording light incident side is less than that in an (n−1)th recording layer, where n is a natural number equal or greater than two.
3 more elements
Dependencies are inferred from the claim text.