Osaka Prefecture

Koatsu Gas Kogyo Co., Ltd.

Souichi Ogawa

Masaru Inoue

Takao Sugioka

A superconductor for magnetic field shield comprising closed-ring disc-shaped superconductive magnetic field shielding members and spacing members having the same shape as that of the magnetic field shielding member and alternately laminated with the shielding members, the superconductor for magnetic field shield being characterized in that the shield has an extremely superior and stable magnetic field shielding effect without any secular reduction of the shielding effect and capable of providing a large shielding space using a minimum amount of material.

Superconductor for magnetic field shield

A magnetic field shield including a superconductive film characterized in that the magnetic field shield comprises a superconductive film layer constituted primarily of a mixed crystalline body of niobium nitride and titanium nitride laminated on a metal substrate, that the magnetic field further comprises a nobium-titanium alloy layer or a metal film layer in the above lamination, that the magnetic field comprises a plurality of the above-mentioned layers, and that the magnetic field has a plurality of small holes passing through the layers in the direction of the thickness. The magnetic field shield of the present invention produces an excellent magnetic field shielding effect due to a superconductive characteristic peculiar to the superconductive film layer constituted primarily by a mixed crystalline body of niobium nitride and titanium nitride. The cooling effect of the metal substrate maintains the magnetic field shielding effect at a high level. In addition, due to the use of the niobium-titanium alloy layer, the magnetic field shield has high resistance against peeling, greatly increasing the practical usefulness of the magnetic field shield. In the case of the magnetic field shield with a plurality of the laminated layers, the cooling effect of the metal film layers included in the multiple layers stably maintains the magnetic field shielding effect of the superconductive film layers. In the case of the magnetic field shield with small holes, the electromagnetic shielding and cooling effects of the holes are added to further strengthen the magnetic field shielding effect.

Magnetic field shield including a superconductive film

A superconductor for magnetic field shielding comprising a substrate, at least one superconductor film layer, which is laminated on the substrate, and a plurality of small holes 2 which pass through the substrate and the superconductor film layer, wherein the thickness of the superconductor film layer is 100 .mu.m or less. The superconductor of the present invention uses both superconductive shielding and electromagnetic shielding to deliver extremely high magnetic shielding performance.

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Osaka, Japan

Souichi Ogawa