Sony Corporation

Hiroshi Tabata

Takeshi Miki

Yousuke Fujii

Provided is an optical recording medium including two or more recording layers, and a light irradiation surface that is irradiated with light for recording an information signal on the two or more recording layers. Among the two or more recording layers, at least one layer other than a layer located on the deepest side from the light irradiation surface includes an oxide of a metal A, an oxide of a metal B, and an oxide of a metal C. The metal A is at least one kind among W, Mo, and Zr, the metal B is Mn, and the metal C is at least one kind among Cu, Ag, and Ni. Ratios of the metal A, the metal B, and the metal C satisfy a relationship of 0.46&#x2264;x1 (provided that, x1=a/(b+0.8c), a representing an atomic ratio [atom %] of the metal A with respect to the sum of the metal A, the metal B, and the metal C, b representing an atomic ratio [atom %] of the metal B with respect to the sum of the metal A, the metal B, and the metal C, and c representing an atomic ratio [atom %] of the metal C with respect to the sum of the metal A, the metal B, and the metal C.

High density optical recording medium having multiple recording layers

An optical recording medium includes a reflective layer, a first dielectric layer, a phase-change recording layer, and a second dielectric layer. The phase-change recording layer has an average composition represented by SbxInyMz, in which M is at least one of Mo, Ge, Mn, and Al, and x, y, and z are values in the ranges 0.70&#x2264;x&#x2264;0.92, 0.05&#x2264;y&#x2264;0.20, and 0.03&#x2264;z&#x2264;0.10, respectively, provided that x+y+z=1, the first dielectric layer includes a zirconium oxide-containing composite material or tantalum oxide, and the second dielectric layer includes a chromium oxide-containing composite material or silicon nitride.

Optical recording medium

An optical information recording medium includes: a substrate; two or more information signal layers provided on the substrate; and a cover layer provided on the information signal layers. At least one of the two or more information signal layers is provided with an inorganic recording layer including Pd oxide, a first protective layer provided on a first main surface of the inorganic recording layer, and a second protective layer provided on a second main surface of the inorganic recording layer. And at least one of the first protective layer and the second protective layer includes a compound oxide of Si oxide, In oxide and Zr oxide as a main component.

Optical information recording medium

An optical information recording medium including: a substrate; two or more information signal layers provided on the substrate; and a cover layer provided on the information signal layers, wherein the surface of one of the side of the substrate and the cover layer is a light irradiation plane, wherein at least one of the information signal layers other than the information signal layer at the deepest portion from the light irradiation plane includes 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 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.

An optical information recording medium includes a recording layer capable of recording information signals on the basis of application of light, wherein the recording layer contains an oxide of metal X and an oxide of metal Y, the metal X is at least one type selected from the group consisting of tungsten and molybdenum, and the metal Y is at least one type selected from the group consisting of copper, manganese, nickel, and silver.

Recording layer for optical information recording medium and optical information recording medium

An optical information recording medium including a substrate; two or more recording layers provided on the substrate; and a protective layer provided on the recording layers, wherein the surface of one of the side of the substrate and the protective layer is a light irradiation plane, at least one of the recording layers other than the recording layer at the deepest position from the light irradiation plane includes W, Pd, and Cu oxides as the principal components, and the ratio of W, Pd, and Cu that are respectively included in the W, Pd, and Cu oxides satisfies the relationship 0.17&#x2266;x(where x=a/(b+0.8c), where a: atomic ratio of W with respect to the total of W, Pd, and Cu, b: atomic ratio of Pd with respect to the total of W, Pd, and Cu, and c: atomic ratio of Cu with respect to the total of W, Pd, and Cu).

Optical information recording medium and manufacturing method thereof and optical information recording medium recording layer

An optical recording medium includes an inorganic recording layer, a first protective layer provided on at least one surface of the inorganic recording layer and containing indium oxide, and a second protective layer provided so as to be adjacent to the first protective layer and containing titanium oxide, zirconium oxide, or tin oxide.

An optical recording medium includes: an inorganic recording layer; and a protective layer including a composite oxide containing an indium oxide provided on at least one surface of the inorganic recording layer, wherein the composite oxide is represented by the formula [(InO)(A)], wherein A is cerium oxide or gallium oxide and X satisfies a range of 0.15&#x2266;X&#x2266;0.75.

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Miyagi, Japan

Hiroshi Tabata