Abstract: A constant velocity joint includes: an outer race having outside ball grooves; an inner race having inside ball grooves; and balls interposed between the outside and inside ball grooves that cooperate to constitute groove portions. The groove portions include first and second groove portions. In the first groove portion, a radial distance between the outside and inside ball grooves is increased in a direction toward an opening end of the outer race when a joint angle is 0 degree. In the second groove portion, a radial distance between the outside and inside ball grooves is reduced in a direction toward the opening end of the outer race in the reference state. A radius of a second outside arc of the outside ball groove of the second groove portion is larger than a radius of a first outside arc of the outside ball groove of the first groove portion.

Abstract: A spline telescopic shaft of a vehicular propeller shaft includes a spline outer shaft and a spline inner shaft. In an outer peripheral surface of an outer spline provided on the spline inner shaft, a first portion is coated with a coating film, and a second portion is not coated with the coating film. The first portion extends from an end portion of the outer spline to a prescribed position, the end portion of the outer spline being located on a side of a distal end portion of the spline inner shaft, the prescribed position being located closer to the distal end portion of the spline inner shaft than an end surface of an inner spline is, and the end surface of the inner spline being located on a side of an opening portion of the spline outer shaft.

Abstract: A sliding member includes: a substrate which has a sliding surface sliding under the presence of lubricating oil; and a film which is fixed to at least a part of the sliding surface. The film contains carbon (C), titanium (Ti), and boron (B), is obtained by repeatedly and alternately layering a first layer containing amorphous carbon as a principal component and a second layer containing C and Ti as principal components, and has hardness of 18 GPa or more.

Abstract: A sliding member includes: a substrate which has a sliding surface sliding under the presence of lubricating oil; and a film which is fixed to at least a part of the sliding surface. The film contains carbon (C), titanium (Ti), and boron (B), is obtained by repeatedly and alternately layering a first layer containing amorphous carbon as a principal component and a second layer containing C and Ti as principal components, and has hardness of 18 GPa or more.

Abstract: An information recording medium has an excellent jitter characteristic with a considerable difference in reflectance between prior to and subsequent to recording. The information recording medium includes a recording layer which contains a material having a reflectance which varies by irradiation of a light beam, on which information is recorded as reflectance variations, and a substrate for supporting the recording layer, the recording layer including a metal nitride as a major component.

Abstract: An information recording medium has an excellent jitter characteristic with a considerable difference in reflectance between prior to and subsequent to recording. The information recording medium includes a recording layer which contains a material having a reflectance which varies by irradiation of a light beam, on which information is recorded as reflectance variations, and a substrate for supporting the recording layer, the recording layer including a metal nitride as a major component.

Abstract: An object of the present invention is to provide a phase-change optical recording medium of an amorphous recording mark type. The optical recording medium is a write once type medium capable of decreasing the degradation of an information signal which has been already recorded. The recording layer of the optical recording medium according to the present invention includes a first recording layer and a second recording layer. The first recording layer comprises a first composition which can be changed into another composition more stable in an amorphous state by combining with a component included in the second recording layer.

Abstract: A film constitution in an optical recording medium including a light incident side substrate and a light reflecting side substrate cooperatively acting as a base of the medium, and includes, between these substrates, those layers formed by sputtering so as to constitute a laminated structure, which layers include: a phase-change recording layer to be phase-changed between an amorphous phase and a crystal phase by laser light irradiation; a first dielectric layer and a second dielectric layer, each having a protective function and an optical adjusting function for the phase-change recording layer; a reflecting film layer for reflecting the laser light transmitted through the phase-change recording layer; a hardness enhancing layer for enhancing the mechanical strength of the medium; and a protecting layer having a function for reducing thermal damages to the light incident side substrate and an optical adjusting function.

Abstract: A front glass substrate is opposite a back substrate with a discharge space in between. On the rear-facing face of the front glass substrate are provided a plurality of row electrode pairs each extending in the row direction and regularly arranged in the column direction to individually form display lines; and a plurality of column electrodes each extending in a direction at right angles to the row electrode pairs and separated from the row electrode pair by a first dielectric layer. A partition wall partitions the discharge space into discharge cells each opposite the opposed transparent electrodes of the row electrode pair. In the plasma display panel structured in this manner, the back substrate is constituted of a metal plate having the surface covered with an insulation layer.

Abstract: An object of the present invention is to provide a phase-change optical recording medium of an amorphous recording mark type. The optical recording medium is a write once type medium capable of decreasing the degradation of an information signal which has been already recorded. The recording layer of the optical recording medium according to the present invention includes a first recording layer and a second recording layer. The first recording layer comprises a first composition which can be changed into another composition more stable in an amorphous state by combining with a component included in the second recording layer.

Abstract: A film constitution in an optical recording medium includes a light incident side substrate 6 and a light reflecting side substrate 1 cooperatively acting as a base of the medium, and includes, between these substrates, those layers formed by sputtering so as to constitute a laminated structure, which layers include: a phase-change recording layer 4 to be phase-changed between an amorphous phase and a crystal phase by laser light irradiation; a first dielectric layer 5 and a second dielectric layer 3, each having a protective function and an optical adjusting function for the phase-change recording layer 4; a reflecting film layer 2 for reflecting the laser light transmitted through the phase-change recording layer 4; a hardness enhancing layer 7 for enhancing the mechanical strength of the medium; and a protecting layer 8 having a function for reducing thermal damages to the light incident side substrate and an optical adjusting function.

Abstract: A double-layer optical disk having characteristics that are less wavelength dependent, allows the use of a pickup comprising a light beam of a different wavelength to read each layer accurately and stably. In the double layer optical disk which comprises, a first reflection layer carrying first information, a spacer layer, and a second reflection layer carrying second information, each laminated on a transparent substrate having a specific refractive index thereby allowing a pickup to read said first and second information, the first reflection layer is formed by laminating a metal layer made of a metal thin film and a dielectric layer made of a dielectric having a refractive index higher than the refractive index of the transparent substrate.

Abstract: An optical recording medium of a multi-layer type comprises; a single or plural spacer layers each carrying pits and/or grooves; a single or plural reflective layers layered on the spacer layers; and a silane coupling treatment layer formed between the reflective layer and the spacer layer adjacent to each other.

Abstract: An apparatus for manufacturing a substrate of an optical recording disk having a transfer layer of uniform thickness. The apparatus forcibly deforms a portion of the substrate ranging from the center portion to an outer circumferential portion so as to provide a substantially conical-convex shape prior to the formation of the transfer layer. The apparatus forms the transfer layer onto a surface side of the conical-convex shape of the substrate.

Abstract: The present invention relates to an optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with both recording layers facing each other. The adhesive layer, containing an adhesive and a reaction initiator, is hardened through polymerization reaction by the reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation. For this reason, the adhesive layers of both disc bases can be bonded together entirely and uniformly and besides, the adhesive layer can rapidly get hardened, which is advantageous for enhancing productivity of a double-face type optical recording disc.

Abstract: There is provided a substrate for an optical recording disk capable of preventing non-uniformity of thickness of the transfer layer due to a camber of the substrate, and having a transfer layer excellent in uniformity of the thickness thereof. The substrate for the optical recording disk is manufactured in such a manner that a portion ranging from a center portion to an outer circumferencial portion of the substrate is forcively deformed in advance prior to the formation of the transfer layer so as to provide substantially a conical-convex shape, and thereafter, the transfer layer is formed onto a surface side of the conical-convex shape of the substrate.

Abstract: An optical recording disk in which a transfer layer having grooves made of ultraviolet setting resin is laminated on the surface of a substrate, and in which a recording layer is laminated on the transfer layer, the optical recording disk comprises a peeling protrusion projectingly provided on the inner circumferential side of the transfer layer.