Kabushiki Kaisha Toshiba

Toshiba Materials Co., Ltd.

Canon Kabushiki Kaisha

Oki Electric Industry Co., Ltd.

Katsuhiko Yamada

Keiichi Fuse

Tadao Saito

Katsunori Hatanaka

Toshihiro Saika

Takayuki Ishii

Kazumi Sakai

Takao Sawa

Tatsundo Kawai

Makoto Ogura

Shinichi Seito

Shigetoshi Sugawa

Noriyuki Kaifu

Kazuaki Tashiro

Hidemasa Mizutani

Atsushi Kubota

Satoshi Itabashi

Tetsuya Shimada

Toshihide Iida

Haruo Tsunoi

Teruo Morikawa

Azuma Tsubota

Shinichi Seitoh

Hiromi Kodama

Kiyoshi Nagasaki

Kenji Ohkawara

A rare earth regenerator material particle and a regenerator material particle group having a high long-term reliability, and a superconducting magnet, an examination apparatus, a cryopump and the like using the same are provided. A rare earth regenerator material particle contains a rare earth element as a constituent component, and in the particle, a peak indicating a carbon component is detected in a surface region by an X-ray photoelectron spectroscopy analysis.

Rare earth regenerator material particle, rare earth regenerator material particle group, and cold head, superconducting magnet, examination apparatus, and cryopump using the same

A refrigerator is provided, including rare earth cold accumulating material particles filled in a cold accumulating vessel. The rare earth cold accumulating material particles are a rare earth oxide or a rare earth oxysulfide. The rare earth cold accumulating material particles define a sintered body. An average crystal grain size of the sintered body is 0.5 to 5 &#x3bc;m, a porosity of the sintered body is 10 to 50 vol. %, and an average pore size of the sintered body is 0.3 to 3 &#x3bc;m. In an arbitrary cross-section of the rare earth cold accumulating material particles, a number of pores per a unit area of 10 &#x3bc;m&#xd7;10 &#x3bc;m is 20 to 70.

Refrigerator including rare earth cold accumulating material particles, and superconducting magnet, inspection device and cryopump using same

A reduction in a permeability of refrigerant gas is suppressed while increasing a filling factor of regenerator material particles with respect to a stage of a cold head. A cold head includes a stage including regenerator material particle groups, and a metal mesh material partitioning the regenerator material particle groups. The metal mesh material has quadrangular mesh holes each having a length of a long side of 1/10 or more and &#xbd; or less of each of average particle sizes of the regenerator material particle groups.

Cold head, superconducting magnet, examination apparatus, and cryopump

A magnetic sheetof an embodiment includes a stack of a plurality of magnetic thin strips and resin film parts. The stack includes from 5 to 25 pieces of the magnetic thin strips. The magnetic thin strips are provided with cutout portions each having a width of 1 mm or less (including 0 (zero)). A ratio (B/A) of a total length B of the cutout portions provided to the magnetic thin strip to a total outer peripheral length A of an outer peripheral area of the magnetic thin strip arranged on one of the resin film parts is in a range of from 2 to 25.

Magnetic sheet and non-contact power receiving device, electronic apparatus and non-contact charging system using the same

The present invention provides a rare earth cold accumulating material particle comprising a rare earth oxide or a rare earth oxysulfide, wherein the rare earth cold accumulating material particle is composed of a sintered body; an average crystal grain size of the sintered body is 0.5 to 5 &#x3bc;m; a porosity of the sintered body is 10 to 50 vol. %; and an average pore size of the sintered body is 0.3 to 3 &#x3bc;m. Further, it is preferable that the porosity of the rare earth cold accumulating material particle is 20 to 45 vol. %, and a maximum pore size of the rare earth cold accumulating material particle is 4 &#x3bc;m or less. Due to this structure, there can be provided a rare earth cold accumulating material having a high refrigerating capacity and a high strength.

Rare earth cold accumulating material particles, and refrigerator, superconducting magnet, inspection device and cryopump using same

The present invention provides a rare earth cold accumulating material particle comprising a rare earth oxide or a rare earth oxysulfide, wherein the rare earth cold accumulating material particle is composed of a sintered body; an average crystal grain size of the sintered body is 0.5 to 5 &#x3bc;m; a porosity of the sintered body is 10 to 50 vol. %; and an average pore size of the sintered body is 0.3 to 3 &#x3bc;m. Further, it is preferable that the porosity of the rare earth cold accumulating material particle is 20 to 45 vol. %, and a maximum pore size of the rare earth cold accumulating material particle is 4 m or less. Due to this structure, there can be provided a rare earth cold accumulating material having a high refrigerating capacity and a high strength.

Provided is a group of rare-earth regenerator material particles having an average particle size of 0.01 to 3 mm, wherein the proportion of particles having a ratio of a long diameter to a short diameter of 2 or less is 90% or more by number, and the proportion of particles having a depressed portion having a length of 1/10 to &#xbd; of a circumferential length on a particle surface is 30% or more by number. By forming the depressed portion on the surface of the regenerator material particles, it is possible to increase permeability of an operating medium gas and a contact surface area with the operating medium gas.

Rare-earth regenerator material particles, and group of rare-earth regenerator material particles, refrigerator and measuring apparatus using the same, and method for manufacturing the same

Growing community of inventors

Yokohama, Japan

Katsuhiko Yamada