Koatsu Gas Kogyo Co., Ltd.

Kohei Otani

Takao Sugioka

Masaru Inoue

Hiroaki Toda

Tetsuo Takagi

Manabu Sato

Yoshiro Saji

Saji Yoshiro

A large-area superconductor magnetic shield comprising a plurality of small superconductor unit layers stuck onto the surface of a large-area substrate, wherein the external peripheral sections of the adjacent unit layers are overlapped mutually or the end sections of the adjacent unit layers are abutted mutually such that the adjacent unit layers do not make contact with one another. Compared with conventional magnetic shields, the magnetic shielding amount at the overlapping sections of the magnetic shield of the present invention is substantially greater.

Superconductor magnetic shield

A static magnetic refrigerator comprising a magnet generating a high-intensity magnetic field, a magnetic working material disposed in the high-intensity magnetic field, a magnetic shield disposed between the magnet and the magnetic working material, and a rotating means for rotating the magnetic shield, the magnetic shield comprising a pair of nearly parallel flat plates or a pair of outwardly curved plates facing each other and made of a superconductor, and the magnetic working material is accommodated in the inner space form by the pair of the flat or curved plates, whereby a magnetization process wherein the magnetic working material is magnetized in the high-intensity magnetic field by way of rotating the magnetic shield at a position allowing the permeation of the magnetic field through the magnetic working material via the pair of the flat or curved plates and a demagnetization process wherein the magnetic working material is demagnetized by way of further rotating the superconducting magnetic shield at another position permitting the shield of the magnetic field via the pair of the flat or curved plates are repeated by the rotating means so that the magnetic working material generates coldness.

Static magnetic refrigerator

A magnetic refrigerator comprising a magnet generating a high-intensity magnetic field, a tube-shaped superconducting magnetic shield, a magnetic working material and a reciprocating means for reciprocatively moving the superconducting magnetic shield or the magnetic working material, the magnetic refrigerator being arranged such that a magnetization process wherein the magnetic working material is magnetized in the high-intensity magnetic field and a demagnetization process wherein the magnetic working material is demagnetized by being accommodated in the hollow section of the magnetic shield are repeated by the reciprocating means so that the magnetic working material generates coldness. By using the property of a tube-shaped superconductor which can shield the magnetism of an external magnetic field passing through the hollow section of the tube and can generate a zero-intensity magnetic field in the hollow section, the magnetic working material magnetized in the high-intensity magnetic field generated by the magnet is inserted into the hollow section of the tube-shaped superconducting shield and is demagnetized in an adiabatic condition to generate coldness. This coldness is used to cool the target cold bath.

Magnetic refrigerator

Growing community of inventors

Osaka, Japan

Kohei Otani