Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1991-03-08
1992-11-17
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
335301, H01F 100
Patent
active
051646960
ABSTRACT:
A magnetic shielding apparatus for eliminating magnetic flux from an object comprises a first superconductor wall provided at one side of the object and a second superconductor wall provided at the other, opposing side of the object and so as to intersect with the interlinking magnetic flux passing through the object. The first and second superconductor walls experience a transition from a normal conduction state to a superconduction state upon cooling below a critical temperature, and each of the first and second superconductor walls has first and second movable members movable in a direction perpendicular to the magnetic flux between a first position in which the first and second movable members conceal the object and a second position in which the first and second movable members form an aperture that exposes the object. Further, there is provided a driving mechanism connected mechanically to the first and second movable members of the first and second superconductor walls for moving the same between the first and second positions, and a cooling head connected to each of the first and second movable members of the first and second superconductor walls for cooling the same below the critical temperature.
REFERENCES:
patent: 3582851 (1971-06-01), Meservey
patent: 4584549 (1986-04-01), Brown
patent: 4646047 (1987-02-01), Vavrek et al.
patent: 4920011 (1990-04-01), Ogawa et al.
IEEE Transactions on Magnetics, vol. 25, No. 2, Mar., 1989, pp. 2273-2275, NY, US & Superconductivity Conference 21st-25th Aug. 1988, San Francisco, U.S.; G. J. Cui et al.: "A Superconductive Shielding Can for High Tc Squid", p. 2274, Para. 1, FIG. 2.
Patent Abstracts of Japan, vol. 13, No. 198 (E-756), 11th May 1989; & JP-A-1 019 798 (Takenaka Komuten) (full abstract).
Patent Abstracts of Japan, vol. 13, No. 364 (E-805), 14th Aug 1989; & JP-A-1 122 196 (Matsushita) (full abstract).
Patent Abstracts of Japan, vol. 13, No. 103 (E-725), 10th Mar. 1989; & JP-A-63 276 293 (Hitachi) (full abstract).
Fujitsu Limited
Korka Trinidad
Picard Leo P.
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