Sumitomo Electric Industries, Limited

Kyoto University

Japan Atomic Energy Institute

Hisao Takeuchi

Kaoru Murabe

Akira Yamakawa

Osamu Komura

Makoto Otsuki

Masaya Miyake

Hitoyuki Sakanoue

Takao Nishioka

Akira Sasame

Seiji Nakahata

Naho Mizuhara

Koichi Sogabe

Masamichi Yamagiwa

Masatoshi Majima

Tomoyuki Awazu

Chihiro Hiraiwa

Takahiro Higashino

Hiromasa Tawarayama

Takahiro Matsuura

Chihiro Kawai

Yasuhisa Yushio

Yohei Noda

Hideaki Nakahata

Takahiro Imai

Takashi Matsuura

Michimasa Miyanaga

Tetsuya Abe

Matsuo Higuchi

Issei Satoh

Yoshio Murakami

Masahiko Shimada

Eiji Kamijo

Keisuke Tanizaki

Kazunari Miyamoto

Akihiko Namba

Takeshi Satoh

Tetsuya Uda

Donglin Han

Hitoshi Akazawa

Taira Okamoto

Ken-ichi Matsushita

A method for producing a cell structure includes: a step of firing a laminated body of a layer containing an anode material and a layer containing a solid electrolyte material, to obtain a joined body of an anode and a solid electrolyte layer; a step of laminating a layer containing a cathode material on a surface of the solid electrolyte layer, and firing the obtained laminated body to obtain a cathode. The anode material contains a metal oxide Ma1 and a nickel compound. The metal oxide Ma1 is a metal oxide having a perovskite structure represented by A1B1M1O(wherein: A1 is at least one of Ba, Ca, and Sr; B1 is at least one of Ce and Zr; M1 is at least one of Y, Yb, Er, Ho, Tm, Gd, In, and Sc; 0.85&#x2264;x1&#x2264;0.99; 0&#x3c;y1&#x2264;0.5; and &#x3b4; is an oxygen deficiency amount).

Method for producing cell structure

A cell structure includes a cathode, an anode, and a protonically conductive solid electrolyte layer between the cathode and the anode. The solid electrolyte layer contains a compound having a perovskite structure and containing zirconium, cerium, and a rare-earth element other than cerium. If the solid electrolyte layer has a thickness of T, the elemental ratio of zirconium to cerium at a position 0.25 T from a surface of the solid electrolyte layer opposite the cathode, Zr/Ce, and the elemental ratio of zirconium to cerium at a position 0.25 T from a surface of the solid electrolyte layer opposite the anode, Zr/Ce, satisfy Zr/Ce&#x3e;Zr/Ce, and Zr/Ce&#x3e;1.

Cell structure, method for manufacturing the same, and fuel cell

A method for growing a Group III nitride semiconductor crystal is provided with the following steps: First, a chamber including a heat-shielding portion for shielding heat radiation from a materialtherein is prepared. Then, materialis arranged on one side of heat-shielding portion in chamber. Then, by heating material to be sublimated, a material gas is deposited on the other side of heat-shielding portion in chamber so that a Group III nitride semiconductor crystal is grown.

Method for growing group III nitride semiconductor crystal and growing device for group III nitride semiconductor crystal

This invention provides a hydrodynamic bearing assembly which realizes a high rotation rate in a stable manner with robust rigidity. The hydrodynamic bearing assembly has a total radial gap of 3 microns or less for preventing contact with the thrust bearing. The thrust bearing is a pump-out type, and the radial bearing has offset grooves on the surface thereof to supply fluid flow to the thrust bearing. A depth ratio of the grooves relative to the diameter of the shaft is preferably 0.005 or less to avoid reduced translational rigidity.

Hydrodynamic bearing assembly

Concerns lithium-doped diamond: Low-resistivity n-type semiconductor diamond doped with lithium and nitrogen, and a method of manufacturing such diamond are provided. Low-resistivity n-type semiconductor diamond containing 10cmor more of lithium atoms and nitrogen atoms together, in which are respectively doped lithium atoms into carbon-atom interstitial lattice sites, and nitrogen atoms into carbon-atom substitutional sites, with the lithium and the nitrogen holding arrangements that neighbor each other. To obtain low-resistivity n-type semiconductor diamond, in a method for the vapor synthesis of diamond, photodissociating source materials by photoexcitation utilizing vacuum ultraviolet light and irradiating a lithium source material with an excimer laser to scatter and supply lithium atoms enables the diamond to be produced.

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This invention is to provide a hydrodynamic bearing assembly, which realizes the high rotation rate in a stable manner and the robust rigidity. The hydrodynamic bearing assembly has a total radial gap of 3 microns or less for preventing the contact in the thrust bearing. The thrust bearing is a pomp-out type one, and the radial bearing has offset grooves on the surface thereof to supply the fluid flow sufficiently to the thrust bearing. The grooves also eliminate a half-whirl. A depth ratio relative to the diameter of bearing is preferably 0.005 or less to avoid the reduced translation rigidity. The radial gap is smoothly enlarged from the center to both ends along the axis, and the shaft is biased to incline the shaft relative to the sleeve, so that the shaft can be rotated with the robust rigidity. Also, a pair of the thrust bearings is provided on both ends of the radial bearing so as to realize the robust rigidity.

Hydrodynamic bearing assembly and spindle motor having the same

A hydrodynamic bearing assembly with improved activation features is provided. The opposing surfaces in the radial and thrust bearings have grooves and with depths shallower gradually towards the downstream flow of the fluid passing therethrough, for generating the uniform dynamic pressure distribution. This allows the dynamic pressure distribution to be leveled so as to increase the bearing supporting force and prevent the dew grom being generated. Any one or both of the opposing surfaces in the thrust bearing has the inclined surface from the inner portion towards the outer portion so that the gap between the opposing surfaces is extended to about 2 microns. This causes the contacting points thereof when halted to be closer to the axis so that the friction can be reduced and the driving torque can be reduced when restating the bearing assembly. This also prevent the contact in the thrust bearing due to the external oscillating motion. Further, a second thrust plate is secured on the other end surface of the sleeve opposite to the thrust plate so that the total weight of the rotational member is supported between the second thrust plate and the end surface of the shaft when halted, thereby reducing the friction at the time of activating.

Dynamic pressure bearing with improved starting characteristics

There is provided a means for preventing wear caused by the contacting/sliding of a thrust hydrodynamic gas bearing surface when a spindle motor is started. A cylinder of a radial hydrodynamic gas bearing that has radial hydrodynamic grooves in an outer circumferential surface thereof and a disk of a thrust hydrodynamic gas bearing that has thrust hydrodynamic grooves in an upper face thereof are disposed on an upper end of an axial center of a stator core having a stator around which a motor coil is wound, a hollow cylinder whose inner surface facing the cylinder of the radial hydrodynamic gas bearing is smooth and a rotor magnet facing the motor coil are disposed on a hub acting as a rotational member, a load in a radial direction is supported by the radial hydrodynamic gas bearing, and a load in a thrust direction is supported by using the thrust hydrodynamic gas bearing together with a magnetic bearing consisting of the stator and the rotor magnet

Spindle motor

To provide a hydrodynamic bearing, small in size and light in weight, and yet simple in structure and inexpensive in cost, which can exhibits a sufficient rigidity. The bearing is structured so as to comprise a radial bearing portion including a groove capable of introducing fluid such as air, and a thrust bearing portion whose one end is connected with the radial bearing portion and whose other end is open to the outside, whereas the structure guides a fluid introduced at the radial bearing portion to the thrust bearing portion and utilizes a pressure at the thrust bearing portion, thereby obtaining a stable thrust force without separately disposing a thrust hydrodynamic pressure generating mechanism. The fluid introduced to the thrust bearing portion is thereafter discharged through an opening linked with outside. The surface area size of the groove is preferably 40% or less to the surface area size of the radial bearing portion as a whole, and the number of such grooves is preferably six or smaller. Where the shape of the groove is an asymmetric shape that the depth is deep in an upstream portion of an airflow but shallow in a downstream portion (aft side), the radial bearing portion and the thrust bearing portion are improved in rigidity.

Dynamic pressure bearing and spindle motor with the bearing

A hydrodynamic gas bearing structure which can effectively prevent the half speed whirl phenomenon and prevent wear at the time of activation or stopping of rotation is implemented in a simple manner. The hydrodynamic gas bearing has a shaft body having an outer periphery, and a cylindrical bearing body opposing to the shaft body with a space maintained in the radial direction. The shaft body has a hollow portion extending in the axial direction. In a cross section vertical to the axial line of the shaft body, the hollow portion has a not-complete-round, symmetrical shape with respect to a line passing through the center of the cross section, for example, an approximately regular triangular shape. As a first distance from the center of the cross section to an outline corresponding to an inner periphery of the hollow portion changes along the peripheral direction of shaft body, the second distance from the center of the cross section to an outline corresponding to the outer periphery of shaft body changes along the peripheral direction of shaft body.

Hydrodynamic gas bearing and manufacturing method thereof

A hydrodynamic gas bearing structure which can effectively prevent the half speed whirl phenomenon and prevent wear at the time of activation or stopping of rotation is implemented in a simple manner. The hydrodynamic gas bearing includes a shaft body having an outer periphery, and a cylindrical bearing body arranged around the shaft body with a space maintained therebetween in the radial direction. The shaft body has a hollow portion extending in the axial direction. In a cross section perpendicular to the axial line of the shaft body, the hollow portion has a not-complete-round, symmetrical shape with respect to a line passing through the center of the cross section, for example, an approximately regular triangular shape. A first distance from the center of the cross section to an outline corresponding to an inner periphery of the hollow portion changes along the peripheral direction of the shaft body as a second distance from the center of the cross section to an outline corresponding to the outer periphery of the shaft body also changes along the peripheral direction of the shaft body.

Hydrodynamic gas bearing structure and optical deflection scanner

Dynamic pressure pneumatic bearing structure and method of manufacturing

Growing community of inventors

Itami, Japan

Hisao Takeuchi