Kabushiki Kaisha Sankyo Seiki Seisakusho

Sankyo Seiki Mfg. Co., Ltd

Fuji Electric Co., Ltd.

Masayuki Ishikawa

Hiromasa Marumo

Shinichi Niwa

Hiroshi Zenisawa

Hirotaka Sakamaki

Takayuki Narita

Shinji Shirai

Toru Kamada

Masayoshi Hara

Takao Nakae

Yoshihito Osawa

Noboru Takarasawa

Takeshi Ozawa

Shizunori Mitsuma

Yukio Okada

Tadashi Taguchi

Hidetoshi Sunohara

Yasuhiko Tsuchihashi

Nobuyuki Nakamori

Hidetoshi Shimada

Kiyoshi Nagashima

Mitsuharu Iwamoto

Shin-ichi Niwa

A method to refine a lubricant on a magnetic recording medium includes a compound A including a perfluoropolyether molecular structure having two hydroxyl groups at each of two ends and a compound B including the perfluoropolyether molecular structure having one hydroxyl group at each of two ends. The method includes putting the lubricant into a pressure vessel set at a pressure and a temperature and removing the compound B dissolved in an extracting medium of a supercritical carbon dioxide fluid that flows at a predetermined rate through the pressure vessel held at a predetermined temperature and at a predetermined pressure. The method performs recovering the compound A dissolved in the extracting medium that flows through the pressure vessel held at the predetermined pressure and at a temperature lower than the predetermined temperature or at the predetermined temperature and at a pressure higher than the predetermined pressure.

Method of refining a lubricant for use on a magnetic recording medium

A bearing member and a dynamic pressure bearing device using the bearing member includes a cylindrical body constituting a bearing member that rotatably supports a shaft member. The cylindrical body is made of a copper metal, and an anti-rust film comprising cupric benzotriazole is formed on the surface of the cylindrical body.

Bearing member and method for manufacturing the same and dynamic pressure bearing device

An oil dynamic pressure bearing device comprises a bearing, a shaft freely rotatably supported by the bearing in a non-contact manner, and a dynamic pressure bearing section defined by at least one dynamic pressure groove on at least one side of the shaft and the bearing for generating dynamic pressure by a lubricant fluid filled in a minute gap between the shaft and the bearing. Grinding scratches are formed on the dynamic pressure bearing section in a circumferential direction of the dynamic pressure bearing section. The dynamic pressure groove may be formed only on one side of either the shaft or the bearing at the dynamic pressure bearing section and the grinding scratches are formed only on the other side.

Oil dynamic pressure bearing device and method for manufacturing the same

A method of manufacturing an aluminum rotor and motor incorporating the rotor where after a solvent cleaning step of a rotator body using a chlorine-family solvent, an alkaline degreasing step using an alkaline degreasing agent is executed for cleaning the rotator body, and the rotator body after undergoing the solvent cleaning step is simply immersed in a treatment tank storing an alkaline degreasing agent, whereby the chlorine-family solvent remaining on the rotator body or aluminum chloride produced by the chlorine-family solvent reacting with aluminum material reacts with the alkaline degreasing agent and is removed easily and well.

Method of manufacturing aluminum rotor and motor incorporating the same

In order to manufacture a dynamic pressure bearing device, there are provided a shaft member, and a thrust plate formed with a press-fitting portion into which the shaft member is press-fitted. At least two relief portions are formed in at least one of the press-fitting portion of the thrust plate and a part of the shaft member which corresponds to the press-fitting portion. The shaft member is press-fitted with the press-fitting portion such that the thrust plate extends perpendicular to an axial direction of the shaft member, while making the relief portions absorb press-fitting stress.

Dynamic pressure bearing device and method of manufacturing the same

An optical pick-up device includes a driven portion including an optical system having an objective lens, driving member including a focus coil for driving the driven portion in a direction of an optical axis, a tracking coil for driving in a direction orthogonal to the optical axis and a magnet, wherein the tracking coil is provided on a point symmetrically with respect to a central shaft and the magnet is provided in such a position that a magnetic flux is linked to one of two coil sides for generating driving force in a tracking direction.

Optical pick up device

Cleaning apparatus provide for the cleaning of a workpiece by first immersing the workpiece in a cleaning tank having a cleaning liquid therein for a predetermined period of time, removing the workpiece from the cleaning tank, moving the workpiece through air for a pre-selected period of time, and supplying the workpiece to a drying device which then dries the workpiece. As the workpiece is moved through the air, the workpiece may be vibrated, moved at an incline then a decline, and/or have air blasted at it, so that any liquid, e.g. rinsing solution, remaining thereon is caused to fall off, such occurring prior to the drying of the workpiece by the drying device.

Cleaning apparatus

A spindle motor comprises a rotor, which is rotatably supported by a stator, a rotor yoke, which is made up of a magnet fixed onto the rotor and a drive magnet, which is made of a bonded magnet which is adhesively fixed onto the rotor. A first metallic layer is formed onto a surface on the rotor yoke facing the drive magnet. A second metallic layer is formed on a surface of the drive magnet facing the rotor yoke.

Spindle motor and method for manufacturing same

A laminated core for a rotating electric machine comprising a plurality of single sheet cores, each single-sheet core being formed by arranging a plurality of salient poles continuously on a beltlike yoke plate and winding the beltlike yoke plate so as to be cylindrical while joining both ends of the beltlike yoke plate, wherein the laminated core is cylindrical and has a plurality of salient poles confronting a magnet, each salient pole having a winding and the laminated core is formed by laminating a plurality of the single-sheet cores.

Laminated core of rotating electric machine

A compressed powder magnetic corer is disclosed in which the mixing ratio (vol %) of the parts occupied by binder resin, ferromagnetic powder and void formed therebetween is set for a specified value so as to obtain desired magnetic characteristics.

Compressed powder magnetic core and method for fabricating same

A frequency generator includes a circuit board having one surface on which a generating coil pattern and a wiring pattern are printed in stacked relationship via an insulating layer. In a preferred embodiment, the coil is pointed over the wiring pattern.

Growing community of inventors

Nagano, Japan

Masayuki Ishikawa