G11B7/24038

OPTICAL RECORDING MEDIUM
20230018411 · 2023-01-19 ·

An optical recording medium includes a plurality of information signal layers. The plurality of information signal layers include a recording layer having a first surface that faces a light irradiation surface and a second surface on the side opposite to the first surface, a first dielectric layer that is provided on the side of the first surface, and a second dielectric layer that is provided on the side of the second surface. The second dielectric layer provided in the information signal layer positioned on the innermost side when viewed from the light irradiation surface contains indium oxide and tin oxide. The recording layer provided in the information signal layer positioned on the innermost side when viewed from the light irradiation surface contains an oxide of a metal MA, an oxide of a metal MB, an oxide of a metal MD, and an oxide of a metal ME, the metal MA is at least one selected from the group consisting of Mn and Ni, the metal MB is at least one selected from the group consisting of W, Mo, Zr and Ta, the metal MD is at least one selected from the group consisting of Cu and Ag, the metal ME is Nb, the contents of the metal MA, the metal MB and the metal ME satisfy the relationship of 0.30≤a.sub.1/(b.sub.1+e.sub.1)≤0.41 (where, a.sub.1: atomic ratio [atomic %] of the metal MA with respect to a total amount of the metal MA, the metal MB, the metal MD and the metal ME, b.sub.1: atomic ratio [atomic %] of the metal MB with respect to a total amount of the metal MA, the metal MB, the metal MD and the metal ME, and e.sub.1: atomic ratio [atomic %] of the metal ME with respect to a total amount of the metal MA, the metal MB, the metal MD and the metal ME), and the atomic ratio e.sub.1 of the metal ME with respect to a total amount of the metal MA, the metal MB, the metal MD and the metal ME is 5 atomic % or more and 18 atomic % or less.

Information storage medium having multiple recording layers

An information recording medium and a method for producing the same according to the present disclosure are configured to have an information layer in which a larger amount of light for reproduction can be obtained, so that the medium is suitable for recording information at high recording density and is useful for a multi-layer optical disc that records a large amount of contents.

Information storage medium having multiple recording layers

An information recording medium and a method for producing the same according to the present disclosure are configured to have an information layer in which a larger amount of light for reproduction can be obtained, so that the medium is suitable for recording information at high recording density and is useful for a multi-layer optical disc that records a large amount of contents.

OPTICAL STORAGE MEDIUM
20220415351 · 2022-12-29 ·

An optical information storage medium includes a substrate and a multilayer polymeric film. The multilayer polymeric film has a first surface and an opposite second surface that extend the length of the multilayer polymeric film. The second surface is adhered to a surface of the substrate. The multilayer polymeric film includes a plurality of coextruded alternating polymeric active data storage layers and polymeric buffer layers.

OPTICAL STORAGE MEDIUM
20220415351 · 2022-12-29 ·

An optical information storage medium includes a substrate and a multilayer polymeric film. The multilayer polymeric film has a first surface and an opposite second surface that extend the length of the multilayer polymeric film. The second surface is adhered to a surface of the substrate. The multilayer polymeric film includes a plurality of coextruded alternating polymeric active data storage layers and polymeric buffer layers.

Recording layer for optical recording medium and optical recording medium
09830941 · 2017-11-28 · ·

An optical recording medium includes a transmissive recording layer containing an oxide of a metal M.sub.A, an oxide of a metal M.sub.B, and an oxide of a metal M.sub.C. The metal M.sub.A is at least one kind selected from the group consisting of Mn and Ni. The metal M.sub.B is at least one kind selected from the group consisting of W and Mo. The metal Mc is Zr. An atomic ratio (M.sub.A/M.sub.B) of the metal M.sub.A to the metal M.sub.B is not less than 0.37 and not more than 1.31. The metal M.sub.C is contained in the transmissive recording layer at not less than 0.9 atomic % and not more than 27.5 atomic %.

Recording layer for optical recording medium and optical recording medium
09830941 · 2017-11-28 · ·

An optical recording medium includes a transmissive recording layer containing an oxide of a metal M.sub.A, an oxide of a metal M.sub.B, and an oxide of a metal M.sub.C. The metal M.sub.A is at least one kind selected from the group consisting of Mn and Ni. The metal M.sub.B is at least one kind selected from the group consisting of W and Mo. The metal Mc is Zr. An atomic ratio (M.sub.A/M.sub.B) of the metal M.sub.A to the metal M.sub.B is not less than 0.37 and not more than 1.31. The metal M.sub.C is contained in the transmissive recording layer at not less than 0.9 atomic % and not more than 27.5 atomic %.

Recording material and optical information recording medium

A recording material includes a dye-bonded polymer compound which contains a polymer compound to which a one-photon absorption dye is bonded, and a glass transition temperature of the recording material is higher than 200° C. An optical information recording medium includes a recording layer and an intermediate layer adjacent to the recording layer, and the recording layer contains the above-described recording material.

Recording material and optical information recording medium

A recording material includes a dye-bonded polymer compound which contains a polymer compound to which a one-photon absorption dye is bonded, and a glass transition temperature of the recording material is higher than 200° C. An optical information recording medium includes a recording layer and an intermediate layer adjacent to the recording layer, and the recording layer contains the above-described recording material.

Optical disc and optical disc device

In a multilayer optical disc having information layers conforming to a plurality of different optical disc standards, because the type of each information layer is not recorded in the other information layers, in read and write operations by a compatible optical disc device conforming to a plurality of optical disc standards, every time the information layer being accessed changes, it has been necessary to read the type of the information layer and select a method of generating a tracking error signal adapted to the type of information layer, so access has taken time. In order to solve the above problem, in the optical multilayer disc according to the present invention, having information layers conforming to a plurality of different optical disc standards, in an area in one of the information layers, information about the other information layers is recorded. The time required to access the other information layers can be reduced by using this information to select a tracking error signal generating method.