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.

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 %.

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 %.

An information recording medium according to the present disclosure is an information recording medium of a write-once-read-many type and records or reproduces information when irradiated with laser light. The information recording medium includes: a substrate; a plurality of information layers at least one information layer of which includes a recording film that is a W—O-based recording film comprising at least tungsten (W) and oxygen (O); and a dielectric film A in contact with the W—O-based recording film, the dielectric film A comprising at least 30 mol % tin oxide.

Provided is a method of manufacturing an optical disk having at least a cover layer, a first information recording surface, a first intermediate layer, a second information recording surface, a second intermediate layer, and a third information recording surface in order from a surface irradiated with a light beam on at least one side, wherein a numerical aperture of an objective lens that converges the light beam on any of the recording surface of the optical disk when information recording or information reproduction of the optical disk is performed is 0.91, standard value dk of each thickness from the surface to the first to third information recording surfaces is set on the premise of standard refractive index no, where k is 1, 2, 3, and a target value of each actual thickness from the surface to the first to third information recording surfaces is determined by a product of conversion coefficient g(n) depending on refractive index n from the first to third information recording surfaces, and standard value dk.

Provided is a method of manufacturing an optical disk having at least a cover layer, a first information recording surface, a first intermediate layer, a second information recording surface, a second intermediate layer, and a third information recording surface in order from a surface irradiated with a light beam on at least one side, wherein a numerical aperture of an objective lens that converges the light beam on any of the recording surface of the optical disk when information recording or information reproduction of the optical disk is performed is 0.91, standard value dk of each thickness from the surface to the first to third information recording surfaces is set on the premise of standard refractive index no, where k is 1, 2, 3, and a target value of each actual thickness from the surface to the first to third information recording surfaces is determined by a product of conversion coefficient g(n) depending on refractive index n from the first to third information recording surfaces, and standard value dk.

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.

Conventionally, in making a double-sided optical disc by attaching recording substrates to each other via an ultraviolet curable adhesive layer, there was a problem that the ultraviolet curable adhesive layer was slow to cure. It is thought that this is because the out gases leached from the recording substrate disturbed the cure reaction of the adhesive layer. In contrast, in the optical disc of the present disclosure, it is possible to cure the adhesive layer in a short time in attaching the recording substrates to each other via the ultraviolet curable adhesive layer, by providing a gas barrier layer at an attachment surface of a substrate to inhibit out gases from leaching from the substrate to the ultraviolet curable adhesive layer.

An information recording medium according to the present disclosure is an information recording medium of a write-once-read-many type and records or reproduces information when irradiated with laser light. The information recording medium includes: a substrate; a plurality of information layers at least one information layer of which includes a recording film that is a WO-based recording film comprising at least tungsten (W) and oxygen (O); and a dielectric film A in contact with the WO-based recording film, the dielectric film A comprising at least 30 mol % tin oxide.

An information recording medium according to the present disclosure is an information recording medium of a write-once-read-many type and records or reproduces information when irradiated with laser light. The information recording medium includes: a substrate; a plurality of information layers at least one information layer of which includes a recording film that is a WO-based recording film comprising at least tungsten (W) and oxygen (O); and a dielectric film A in contact with the WO-based recording film, the dielectric film A comprising at least 30 mol % tin oxide.