Abstract: A method for recording data in an optical recording medium which can record data in information recording layers other than an information recording layer farthest from a light incidence plane of an optical recording medium including a plurality of information recording layers in a desired manner and reproduce data from information recording layers other than the information recording layer farthest from the light incidence plane in a desired manner.

Abstract: An apparatus for recording data on an optical recording medium comprising a laser beam source 51 for emitting a laser beam, an objective lens, laser power control means 52 for modulating a power of the laser beam emitted from the laser beam source like a pulse between at least a recording power and a base power having a lower level than the recording power, a memory 55, and a control unit 50 for controlling a whole operation, wherein a timing for causing the power of the laser beam to rise to be the recording power when forming a longer recording mark than the shortest recording mark on a recording layer of the optical recording medium by using a laser beam modulated by a single pulse is delayed from a timing for causing the power of the laser beam to rise to be the recording power when forming the shortest recording mark and the control unit can build a recording strategy determined to form a recording mark on the recording layer based on ID data recorded on the optical recording medium stored in the memory.

Abstract: An optical recording medium includes a substrate, a light transmission layer and a recording layer formed between the substrate and the light transmission layer, the recording layer containing at least one simple substance of a metal element M selected from a group consisting of Zn and La and an element X selected from a group consisting of S and O which can combine with the metal element M to form a compound of the element X with the metal element M and the optical recording medium being constituted so that upon being irradiated with a laser beam for recording data, a crystal of the compound of the element X with the metal element M is formed and grows to form a crystal region thereof. According to the thus constituted optical recording medium, a reproduced signal having a good C/N ratio can be obtained when data recorded in the recording layer are reproduced.

Abstract: A method for recording data in an optical recording medium according to present invention is constituted so that data are recorded in an optical recording medium including a light transmission layer and two recording layers by projecting a laser beam whose power is pulse-like modulated between a recording power and a bottom power lower than the recording power onto the optical recording medium from a side of the light transmission layer and forming recording marks having different lengths in the recording layers and that when a recording mark having a longer length than that of the shortest recording mark is to be formed in the recording layers by modulating the power of a laser beam using a single pulse, a time of raising the power of the laser beam to the recording power is delayed relative to a time of raising the power of the laser beam to the recording power when the shortest recording mark is to be formed.

Abstract: An optical information-recording medium which is capable of reducing dependency on the wavelength of a laser beam used in recording and reproducing data, while preventing occurrence of corrosion of a recording film and a crack in a dielectric film. Dielectric films of a recording layer other than a farthest information layer as viewed from the direction of irradiation of the laser beam have thicknesses thereof defined such that when the laser beam is irradiated onto the information layer, a reflectance of the information layer exhibited with respect to a laser beam in a first wavelength region ranging from 370 nm to 380 nm, and a reflectance of the same exhibited with respect to a laser beam in a second wavelength region ranging from 610 nm to 640 nm both assume minimum values relative to reflectances of other laser beams whose wavelengths are outside the first and second wavelength regions.

Abstract: An optical recording disk includes a support substrate, grooves and lands alternately formed on one major surface of the support substrate, an optical functioning layer formed on the one major surface of the support substrate on which the grooves and the lands are formed and including a recording layer and a light transmission layer formed on the optical functioning layer, the grooves and the lands being formed so that the depth Gd of each of the grooves is equal to or larger than 15 nm and equal to or smaller than 25 nm and the half width Gw is equal to or larger than 150 nm and is equal to or smaller than 230 nm, and the recording layer including a first recording film containing Si as a primary component and a second recording film containing Cu as a primary component.

Abstract: An optical recording medium includes a substrate and a recording layer in which data can be recorded by projecting a laser beam thereonto, the recording layer including a first recording film containing an element selected from the group consisting of Si, Ge, C, Sn, Au, Zn and Cu as a primary component and a second recording film containing Cu as a primary component.

Abstract: An optical recording medium includes a support substrate and two information recording layers, an information recording layer close to a light incidence plane through which a laser beam is projected including a first dielectric film, a second dielectric film and a recording layer disposed between the first dielectric film and the second dielectric film and a thickness of each of the first dielectric film and the second dielectric film being determined so as to be equal to or larger than D21 and equal to or smaller than D22, where D21 is smaller than D2, D22 is larger than D2, and D21 and D22 are determined in such a manner that the dependency X of light transmittance of the information recording layer close to the light incidence plane on the wavelength of a laser beam is smaller than 1.

Abstract: An optical recording medium includes a substrate and a recording layer in which data can be recorded by projecting a laser beam thereonto, the recording layer including a first recording film containing an element selected from the group consisting of Si, Ge, Sn, Mg, In, Zn, Bi and Al as a primary component and a second recording film containing Cu as a primary component and 10 to 30 atomic % of Al as an additive.

Abstract: An optical recording medium includes a substrate and a plurality of recording layers laminated via at least intermediate layers, at least one of the recording layers other than a recording layer farthest from a light incidence plane among the plurality of recording layers containing at least one metal M selected from a group consisting of Ni, Cu, Si, Ti, Ge, Zr, Nb, Mo, In, Sn, W, Pb, Bi, Zn and La and an element X which can combine with the metal M upon being irradiated with a laser beam for recording data, thereby forming a crystal of a compound of the element X with the metal M. According to the thus constituted optical recording medium, it is possible to record data in and reproduce from a farthest recording layer from a light incidence plane in a desired manner and it is possible to record data in and reproduce from recording layer(s) other than the farthest recording layer from the light incidence plane in a desired manner.

Abstract: An optical recording medium includes a substrate, a protective layer and a plurality of information recording layers between the substrate and the protective layer and capable of recording data in the plurality of information recording layers and reproducing data recorded in the plurality of information recording layers by projecting a laser beam via a light incidence plane constituted by one of the surfaces of the substrate and protective layer onto the plurality of information recording layers, each of the information recording layers other than a farthest information recording layer from the light incidence plane including two recording films, a first dielectric film located on the side of the light incidence plane with respect to the two recording films and containing an oxide as a primary component and added with nitrogen, and a second dielectric film located on the opposite side of the light incidence plane with respect to the two recording films and having a lower thermal conductivity than that of the

Abstract: An optical recording medium includes a recording layer and a dielectric layer formed in the vicinity of the recording layer and the dielectric layer contains an oxide as a primary component and being added with nitrogen. The thus constituted optical recording medium can exhibit excellent optical characteristics with respect to a laser beam of desired wavelength used for recording data and reproducing data.

Abstract: An optical recording medium includes a substrate, a light transmission layer and a plurality of recording layers between the substrate and the light transmission layer and capable of recording data in the plurality of recording layers and reproducing data recorded in the plurality of recording layers by projecting a laser beam via the light transmission layer onto the plurality of recording layers, at least one recording layer other than a farthest recording layer from the light transmission layer among the plurality of recording layers including a first recording film containing Si as a primary component and a second recording film located in the vicinity of the first recording film and containing Cu as a primary component. In the thus constituted optical recording medium, it is possible to record data in a farthest recording layer from the light transmission layer and reproduce data from the farthest recording layer in a desired manner.

Abstract: An optical recording medium includes a substrate, a light transmission layer and a plurality of recording layers between the substrate and the light transmission layer and capable of recording data in the plurality of recording layers and reproducing data recorded in the plurality of recording layers by projecting a laser beam via the light transmission layer onto the plurality of recording layers, at least one recording layer other than a farthest recording layer from the light transmission layer including a reflective film containing Ag as a primary component and C as an additive. In the thus constituted optical recording medium, recording characteristics and reproducing characteristic of the respective recording layers can be improved.