Abstract: An optical data recording medium, in which irradiation of a light beam is used for recoding and/or reproducing data includes (i) a substrate having an a rise and/or a recess which are a light-incident surface, (ii) a reflective layer, provided on the light-incident surface of the substrate, for reflecting the light beam, (iii) a light absorption layer for converting, to heat, a light of the light beam to heat on the surface of the reflective layer, (iv) a reproducing layer, provided on the surface of the heat-light converting layer, having a transmittance that changes in accordance with a light intensity distribution of the light beam. The optical data recording medium is excellent in super-resolution property, and enables reproduction of a shorter mark length.

Abstract: This invention is an optical data recording medium having a substrate protective film for effectively suppressing deformation (warpage) associated with change in environmental humidity. The optical data recording medium includes a transparent substrate, a thin film layer formed on one surface of the transparent substrate, a thin film protective film formed of a resin as a main component on the thin film layer, and a substrate protective film formed of a resin as a main component on the other surface of the transparent substrate than the thin film protective film, in which the thin film layer is a single layer film or a multi-layer film including at least one of a dielectric film, a recording film and a reflective film, and the substrate protective film has a coefficient of humidity expansion that is larger than a coefficient of humidity expansion of the thin film protective film.

Abstract: An information processing medium includes a substrate, a single layered or multilayered thin film layer formed on the substrate, and a thin protective film formed to cover at least one surface of the thin film layer. The thin protective film is mainly comprised of a synthetic resin. At least either one of a Young's modulus and a linear expansion coefficient of the thin protective film has a value compensating a radial skew variation of the substrate caused by a change in ambient conditions.

Abstract: An optical information recording medium includes a transparent substrate, a thin film layer formed on said transparent substrate and having a recording film, a thin film protecting film formed on said thin film layer, and a substrate protecting film formed on said transparent substrates. A neutral plane of deformation caused by a temperature change of the optical information recording medium is present within the thin film layer. Consequently, it has become possible to provide an optical information recording medium which can prevent deformation (warpage) caused by temperature and humidity changes and be readily manufactured.

Abstract: A disc cartridge of the present invention is provided with a protrusion section on a shutter sliding surface so as to surround at least part of an opening. Moreover, a shutter for opening and closing the opening is provided with a shielding section for covering the opening and the protrusion section and a sliding surface for sliding on a shutter sliding surface during opening and closing operations of the shutter.

Abstract: A disk cartridge includes a case, substantially rectangular in shape, provided with a disk-shaped rotatable recording medium therein, the case including a plurality of windows through which the recording medium is exposed and a recording or reproducing head is inserted when recording or reproducing, and covering boards provided for the plurality of windows respectively, that are capable of opening and closing so as to cover the plurality of windows when recording or reproducing is not performed, a first window and a second window of the plurality of windows being formed on one surface, and a width of the first window in an opening and closing direction of the covering boards being wider than that of the second window. With this arrangement, it is possible to provide a disk cartridge capable of adopting for both a driving device for a small-sized disk and a driving device for a large-sized disk.

Abstract: In the optical information recording medium of the present invention, a first recording layer having a translucent film and a second recording layer having a reflection film are layered. At least one layer of the first recording layer is provided, and the translucent film reversibly varies its reflectance and its transmittance according to a temperature variation caused by difference in a converging state of reproducing light. This ensures to obtain a sufficient amount of the reproducing light reflected from the first and second recording layers.

Abstract: This invention is an optical data recording medium having a substrate protective film for effectively suppressing deformation (warpage) associated with change in environmental humidity. The optical data recording medium includes a transparent substrate, a thin film layer formed on one surface of the transparent substrate, a thin film protective film formed of a resin as a main component on the thin film layer, and a substrate protective film formed of a resin as a main component on the other surface of the transparent substrate than the thin film protective film, in which the thin film layer is a single layer film or a multi-layer film including at least one of a dielectric film, a recording film and a reflective film, and the substrate protective film has a coefficient of humidity expansion that is larger than a coefficient of humidity expansion of the thin film protective film.

Abstract: An optical data recording medium includes a transparent substrate, a thin film layer formed on the transparent substrate and a protective film which is mainly comprised of a resin and formed on the thin film layer for protecting the thin film layer. The thin film layer is a single layered or multilayered film including at least any one of a dielectric film, a recording film and a reflective film, and at least either one of a linear expansion coefficient and a Young's modulus of the protective film is greater than that of the transparent substrate, the linear expansion coefficient of the protective film is greater than 7.0×10−5 (1/° C.) and smaller than 5.0×10−4 (1/° C.).

Abstract: An optical data recording medium includes a transparent substrate, a thin film layer formed on the transparent substrate and a protective film which is mainly comprised of a resin and formed on the thin film layer for protecting the thin film layer. The thin film layer is a single layered or multilayered film including at least any one of a dielectric film, a recording film and a reflective film, and an expansion coefficient under humidity (ratio of expansion (1/%) where a difference of relative humidity (vapor content/saturated vapor amount at 25° C.) is increased by 1%) of the protective film is greater than that of the transparent substrate and smaller than 1.7×10−4(1/%).

Abstract: A disc cartridge of the present invention has an arrangement in which a disc cover is provided so as to cover one side of a disc in a disc shape having a recording layer for recording/reproducing information. This arrangement protects a surface for recording/reproducing from being damaged, being attached by dust, or being dirty. Meanwhile, this arrangement gives a significantly thinner thickness to the disc cartridge.

Abstract: An amorphous magnetic thin film of TbDyFeCo alloy is described, which is a multi-layer film formed by alternatively laminating a TbFeCo layer and a DyFeCo layer on a substrate and has an axis of easy magnetization perpendicular to a film surface, wherein, when the composition of the magnetic thin film is represented by Tb.sub.x Dy.sub.y (Fe.sub.l-z Co.sub.z).sub.1-(x+y) and when x, y, and z are within ranges of 0<x.ltoreq.0.12, 0<y.ltoreq.0.12, and 0<z.ltoreq.0.30, a condition to be satisfied by x and y is 0.25.ltoreq.x/(x+y). Consequently, an inexpensive magneto-optical recording medium with an improved C/N ratio is manufactured.

Abstract: An amorphous magnetic thin film of TbDyFeCo alloy is described, which is a multi-layer film formed by alternately laminating a TbFeCo layer and a DyFeCo layer on a substrate and has an axis of easy magnetization perpendicular to a film surface, wherein, when the composition of the magnetic thin film is represented by Tb.sub.x Dy.sub.y (Fe.sub.1 -.sub.z Co.sub.z)1-(x+y) and when x, y and z are within ranges of 0<x.ltoreq.0.12, 0<y.ltoreq.0.12, and 0<z .ltoreq.0.30, a condition to be satisfied by x and y is 0.25.ltoreq.x/(x+y). Consequently, an inexpensive magneto-optical recording medium with an improved C/N ratio is manufactured.

Abstract: A target unit includes a backing plate and a target member disposed on the backing plate. The target member includes at least one erosion member of a sputtering material and at least one holding member for releasably holding the erosion member on the backing plate.

Abstract: A solar cell including a semiconductor substrate, a diffused layer provided in the semiconductor substrate by diffusion of dopant impurities, and a contact made of metal paste formed on the diffusion layer. The metal paste includes metal powder which functions as the main contact material, glass frits, an organic binder, a solvent, and an element belonging to the fifth group of the periodic table.