Optical recording medium and production method of the same
AssigneeMitsubishi Chemical Corporation
InventorsHaruo Kunitomo, Takashi Ohno
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Abstract
The present invention relates to an optical recording medium having a protective layer and a phase-change recording layer on a substrate, said protective layer containing a metallic oxysulfide and an optical recording medium having a protective layer and a phase-change recording layer, said protective layer being formed by sputtering using a target comprising a metallic oxysulfide.
Claims25
An optical recording medium having a protective layer and a phase-change recording layer, said protective layer being formed by sputtering using a target comprising a metallic oxysulfide, wherein the metallic oxysulfide comprises at least one rare earth metal, and wherein said target comprising at least 50 mol % of the metallic oxysulfide.
An optical recording medium having a protective layer and a phase-change recording layer on a substrate,
- wherein said protective layer is formed by sputtering using a target comprising at least 50 mol % of Y2O2S or Y2O2Se;
- wherein said protective layer comprises yttrium, oxygen, sulfur or selenium and if necessary other component(s);
- and
- wherein when the protective layer contains zinc, the number of atoms of zinc is smaller than the total number of atoms of sulfur and selenium.
A method for producing an optical recording medium comprising forming a protective layer(s) on a substrate by sputtering with a target for forming protective layer, metallic oxysulfide being contained in said target for forming a protective layer, wherein the metallic oxysulfide comprises at least one rare earth metal.
Dependencies are inferred from the claim text.