Patent Number: 6,486,393

Title: Magnetically shielding structure

Abstract: By combining magnetically shielding members of various different properties with each other, a magnetically shielding capability of a magnetically shielding structure is made to improve and a greatly reduced magnetic field, as compared to an external one, can be realized effectively. The penetrating magnetic field has a distribution, on the longitudinal axis of a cylindrical shielding body made of a material manifesting a Meissner effect, which attenuates toward the center direction of the cylindrical shielding body. Magnetic induction is generated in a cylindrical collar made of a highly permeable material. Then, the penetrating magnetic field is shorted magnetically, being absorbed by the highly permeable material. To make this possible, the cylindrical collar, made of a highly permeable material, which has an opening along the longitudinal direction of the cylindrical shielding body, is provided, leaving a space between the cylindrical shielding body made of the superconductive material manifesting the Meissner effect and itself.

Inventors: Matsuba; Hironori (Kanagawa, JP), Irisawa; Daiichi (Kanagawa, JP), Yahara; Akihito (Kanagawa, JP)

Assignee: Furukawa Denki Kogyo Kabushiki Kaisha

International Classification: G01R 33/28 (20060101); G01R 33/421 (20060101); H05K 9/00 (20060101); H05K 009/00 ()

Expiration Date: 11/26/2019