Konishiroku Photo Industry Co., Ltd.

Hoya Corporation

Asahi Denka Kogyo K.k.

Ihi Corporation

Gradco Japan Ltd.

Hokushin Industries, Inc.

Hiroshi Tsuchiya

Hideki Isono

Takashi Maeda

Noriyoshi Tarumi

Shinji Eda

Masakazu Kokiso

Yoshinori Marumo

Meizo Shirose

Naomichi Omori

Jiro Takahashi

Shigeru Inowa

Yoshio Yamazaki

Kazuo Ohkawa

Ryubun Seimiya

Tadashi Kaneko

Kazuo Omori

Yumiko Kato

Kuniaki Kimura

Makoto Kokura

Hiroaki Ohta

Atsushi Tezuka

Kazushige Masunari

Takaaki Sugimura

Yutaka Ozawa

Kazuhiko Morio

Hisashi Murase

Provided are a magnetic disk substrate and a method of manufacturing the same, wherein the magnetic disk substrate has very few defects present on its surface with an arithmetic mean roughness (Ra) at a level in the vicinity of 0.1 nm and thus is suitable as a substrate for a magnetic disk with high recording density. The magnetic disk glass substrate is such that the arithmetic mean roughness (Ra) of the main surface of the glass substrate measured using an atomic force microscope with a resolution of 256&#xd7;256 pixels in a 2 &#x3bc;m&#xd7;2 &#x3bc;m square is 0.12 nm or less and the number of defects detected to have a size of 0.1 &#x3bc;m to 0.6 &#x3bc;m in plan view and a depth of 0.5 nm to 2 nm is less than 10 per 24 cm, wherein the defects are each detected using a shift in wavelength between incident light and reflected light upon irradiating and scanning helium neon laser light with a wavelength of 632 nm on the main surface of the glass substrate.

Glass substrate for a magnetic disk and magnetic disk

A binding apparatus performs a binding process by bonding the end side of the sheet bundle, and is provided with a notch cutter that forms a notch in the end side used in the sheet binding process in the middle of the sheet conveyance path of the binding apparatus. The notch-forming unit includes a pair of sheet conveyance guides for forming a part of the sheet conveyance path, a cutter provided in a rotatably supported bracket, and a biasing means for applying a force to the cutter to face the sheet conveyance path formed by a pair of the sheet conveyance guides at all times.

Binding apparatus

Provided are a magnetic disk substrate that can be adapted to a reduction in flying height of a head in an HDD and to an increase in rotational speed therein, and a method of manufacturing such a substrate. In an annular glass substrate for a magnetic recording medium, a main surface () of the glass substrate is uniformly inclined from an inner peripheral end () to an outer peripheral end () and has an isotropic shape with respect to an axis passing through the center of the glass substrate. That is, it is rotationally symmetric with respect to an arbitrary angle rotation about the axis passing through the center of the glass substrate.

Magnetic disk substrate, method for manufacturing the same, and magnetic disk

A reference vibratorof the present invention includes: a vibrator bodyconfigured to mount to a mountin an unbalance measurement deviceto which a rotary product is mounted at the time of unbalance measurement, in a same mounting state as the rotary product; a vibration generatorfixed to the vibrator bodyand that applies vibrations to the vibrator body; and a control unitthat controls the vibration generator. Because vibration is caused by the vibration generatorfixed to the vibrator body, repeatability of vibration force is high. This makes it possible to apply vibrations for repeatability check to the unbalance measurement devicewith an accurate vibration force. Thus, variations in vibration force can be eliminated, and the repeatability of the unbalance measurement devicecan be properly checked.

Reference vibrator for an unbalance measurement device

Disclosed herein is a process for the preparation of a chlorinated rubber, wherein chlorine gas is caused to act on a polyisoprene rubber to prepare the chlorinated rubber. Chlorine gas is blown into a high-acidity aqueous dispersion of the polyisoprene rubber to chlorinate the polyisoprene rubber, whereby a chlorinated isoprene rubber with high performance is prepared stably in an aqueous medium.

Preparation process of chlorinated rubber

Energy beam curable composition

A toner for developing an electrostatic latent image comprising a binder resin, a coloring agent, a compound selected from a group consisting of silica and a hydrophobic aluminum oxide or a hydrophobic titanium oxide.

Toner for developing electrostatic latent image

An intermediate transfer member for transferring a toner image on a carrier which comprises an addition polymerization type silicone rubber. The intermediate transfer member has a marked characteristics of less exudating components such as unreacted components or residual components as compared with prior art products.

Intermediate transfer member for transferring toner image on a carrier

A device for guiding a recording paper, which comprises a guide member pivoted to a fixed portion of the device to guide the recording paper to a transfer position, the guide member being urged to rotate in one direction. A reference surface for determining the position of end portion of the guide member in the direction of being fed the paper is formed in the fixed portion of the device. The reference surface has a radius of curvature which is slightly greater than the outer diameter of a photosensitive drum and a center of curvature which is in agreement with the center of said photosensitive drum.

Device for guiding a recording paper

An improved method of producing a thin-walled endless belt by centrifugal molding, which comprises introducing a liquid curable silicone rubber dissolved in a solvent into a rotating cylindrical mold, hardening said liquid curable silicone rubber to form a mold surface on the inner surface of said cylindrical mold, and thereafter introducing a thermosetting resin dissolved in a volatile solvent onto said mold surface to form the endless belt.

Method of producing thin-walled endless belt

Growing community of inventors

Tokyo, Japan

Hiroshi Tsuchiya