Abstract: A stamper-forming electrode material contains Ag as its main ingredient and at least one other element, preferably Au and/or Cu. It is preferred that the Au and Cu contents each be 5.0 wt % or less. A stamper-forming thin film is made of this stamper-forming electrode material, whereby its corrosion resistance is improved to suppress damage to itself, and a high-quality stamper can hence be formed.

Abstract: A stamper-forming electrode material contains Cu as its main ingredient and at least one other element, preferably Ag and/or Ti. It is preferred that the Ag content be 10.0 wt % or less and that the Ti content be 5.0 wt % or less. A stamper-forming thin film is made of this stamper-forming electrode material, whereby its corrosion resistance is improved to suppress damage to itself, and a high-quality stamper can hence be formed.

Abstract: A master-disc-manufacturing apparatus includes an electron-beam emitting portion for emitting an electron beam, an electron-beam converging portion for converging an electron beam, a retarding voltage applying portion for applying a substrate with a negative potential having a magnitude of decelerating the electron beam, and a vacuum atmosphere producing portion for evacuating a chamber to produce a vacuum atmosphere therein.

Abstract: To present a material for stamper free from deterioration of stamper quality due to reaction with an electron-attracting radical contained in the resist material. An electrode formed on the surface of a patterned resist film 2 for electrocasting a stamper material is formed of a nickel alloy thin film 3 comprising Ni element as a principal component, and Ru element added in a range of less than 25 percent by weight.

Abstract: To present a material for stamper free from deterioration of stamper quality due to reaction with an electron-attracting radical contained in the resist material. An electrode formed on the surface of a patterned resist film 2 for electrocasting a stamper material is formed of a nickel alloy thin film 3 comprising Ni element as a principal component, and Ru element added in a range of less than 25 percent by weight.

Abstract: An information recording apparatus and a method therefor which can form a beam guide groove in the shape of highly accurate rectangle having abrupt edges. A recording mark is formed by exposing a recording medium with a recording beam having a beam diameter smaller than the beam guide groove, while periodically vibrating the recording beam in a direction perpendicular to a recording track on the recording medium, or in both horizontal and vertical directions of the recording track.

Abstract: The present invention is to provide a production method for an optical disc, capable of obtaining a good S/N ratio without deterioration of the stamper quality due to reaction with an electron attractive group contained in a resist material. The processes of forming a resist film on a substrate, patterning the resist film on the substrate by an electron beam cutting, forming a nickel alloy thin film on the patterned resist film, forming a nickel layer on the nickel alloy thin film by the electrocasting, and injection molding of a resin, using the nickel layer peeled off from the nickel alloy thin film as a stamper, are provided. The nickel alloy thin film has a composition containing Ni element as the main component as well as Ru element by less than 25% by weight.

Abstract: A hybrid recording medium includes a read-only area in which a file is previously recorded, and a write area capable of updating and recording the file, characterized in that volume configuration information 21 and VTOC 22 about a file system are recorded in the write area is used in an information record apparatus.

Abstract: An information recording medium using a substrate having light transmittancy permitting high density recording to be achieved and a recording method permitting such an information recording medium using a substrate having light transmittancy to be recorded in a high density are provided. The information recording medium is formed by layering an ITO film and EB resist on a transparent insulating substrate formed of a glass material having light transmittancy. At the time of recording information, as the ITO film is set at a ground potential, an electron beam having recording information is irradiated upon a surface of the EB resist for a prescribed scanning to perform electron beam exposure, and pits corresponding to the information to be recorded are formed at the exposed positions.

Abstract: An information recording apparatus including a device for driving an optical-disk's master disk, an electron lens barrel for having an electron beam irradiate a recording surface of a disk, a translational device for producing, between the disk and the electron lens barrel, a relative movement in a direction parallel to the recording surface and a container for enclosing the elements of the apparatus adapted to support a vacuum atmosphere. The driving device includes a turn table 4, a spindle 14a for supporting the turn table, a motor 14 for driving the spindle, and a magnetic shield for preventing magnetic fields of the motor from leaking outward. The motor is enclosed in the shield to prevent its magnetic fields from affecting the electron beam, which makes it possible to record information with high accuracy. The use of the motor as a drive source realizes easier and more responsive control of the turn table than that in the prior art.

Abstract: An optical recording medium initializing apparatus is disclosed in which an initializing light beam having a Gaussian distribution is applied to an optical recording medium. The optical energy thus applied to the medium is uniform in distribution, thus resulting in the satisfactory initialization of the recording medium.

Abstract: On the phase change optical information recording medium, a plurality of protection pits each smaller than one pit on the pre-pit region are provided over the entire data region of the recording film at least on its surface. Therefore, even when overwriting is repeatedly performed, the reproduced data waveform is distorted less frequently and data error is reduced. By forming the group of protection pits, the adhesive strength between the phase change recording film and the protective film can be increased, and the reliability of exfoliating strength can be improved.