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AssigneeHitachi, Ltd.
InventorsYusuke Seki, Daisuke Suzuki, Kuniomi Ogata, Keiji Tsukada
Estimating the term…
There is provided a magnetic shield which can shield external magnetic fields in the direction of an axis of a tubular magnetic shield and in the direction vertical to the axis. A magnetic shield has a cylindrical ferromagnetic substance 2-1 having openings on both ends and two superconducting loops housed in the respective insides of superconducting loop containers 1-1, 1-2. The superconducting loops are constructed of high critical temperature superconducting wire. The two superconducting loops have semicircle shapes and are arranged in x-direction so as to be symmetrical with respect to an axis of the cylindrical ferromagnetic substance 2-1. The superconducting loop containers 1-1, 1-2 are arranged in the insides near both open ends of the cylindrical ferromagnetic substance 2-1 with supports 20. The superconducting loops are arranged to be vertical to the axis of the cylindrical ferromagnetic substance 2-1. The superconducting loops are cooled by liquid nitrogen or a refrigerator. A lightweight, small magnetic shield having high openability can be realized.
A magnetic shield comprising a tubular magnetic shield constructed of a ferromagnetic substance for surrounding one axis, and a plurality of superconducting loops arranged on a plane vertical to said one axis near at least one end in the direction of said one axis of said tubular magnetic shield.
A magnetic shield comprising a cylindrical magnetic shield constructed of a ferromagnetic substance, and a plurality of superconducting loops arranged on a plane vertical to an axis near at least one end in the direction of said axis of said cylindrical magnetic shield.
A relative arrangement method of a magnetic shield having a tubular magnetic shield constructed of a ferromagnetic substance for surrounding one axis and a plurality of superconducting loops arranged on a plane vertical to said one axis near at least one end in the direction of said one axis of the said tubular magnetic shield, and an instrument for measuring a biomagnetic field which has detection coils and measures a magnetic field generated from a living body, wherein said detection coils are arranged on the inside of said tubular magnetic shield so that the planes of said detection coils are parallel to said one axis.
A relative arrangement method of a magnetic shield having a tubular magnetic shield constructed of a ferromagnetic substance for surrounding one axis and a plurality of superconducting loops arranged on a plane vertical to said one axis near at least one end in the direction of said one axis of the said tubular magnetic shield, and a measuring instrument using a charged particle beam, wherein said measuring instrument is arranged in the inside of said tubular magnetic shield so that the travel direction of said charged particle beam is parallel to said one axis.
An instrument for measuring a biomagnetic field, comprising a magnetic shield having a plurality of cylindrical magnetic shields constructed of a ferromagnetic substance for surrounding an axis and having different diameters and a plurality of superconducting loops arranged on a plane vertical to said axis near at least one end in the direction of said axis of said cylindrical magnetic shield in which the length in the direction of said axis of said cylindrical magnetic shield is longer as said diameter of said cylindrical magnetic shield is larger, another said plurality of said cylindrical magnetic shields are arranged on the inside of said cylindrical magnetic shield in which said diameter is largest, and said plurality of superconducting loops are arranged in the inside portion of said cylindrical magnetic shield arranged on the outermost side and in the outside portion of said cylindrical magnetic shield arranged on the innermost side;
An instrument for measuring a biomagnetic field, comprising a magnetic shield having a tubular magnetic shield constructed of a ferromagnetic substance for surrounding one axis and a plurality of superconducting loops arranged on a plane vertical to said one axis near at least one end in the direction of said one axis of said tubular magnetic shield, and detection coils detecting a component in the direction vertical to said one axis of a magnetic field generated from a living body inserted into the inside of said magnetic shield, said detection coils being arranged on the inside of said tubular magnetic shield so that the planes of said detection coils are parallel to said one axis.
Dependencies are inferred from the claim text.