The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 2008
Filed:
Aug. 31, 2006
Ryuya Ando, Hitachi, JP;
Mitsushi Abe, Hitachinaka, JP;
Takeshi Nakayama, Hitachinaka, JP;
Tsutomu Yamamoto, Hitachi, JP;
Ryuya Ando, Hitachi, JP;
Mitsushi Abe, Hitachinaka, JP;
Takeshi Nakayama, Hitachinaka, JP;
Tsutomu Yamamoto, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnet device has main coils in a pair positioned facing each other to form a static magnetic field space in between and external magnetic flux shielding coils placed coaxially to the main coils. The external magnetic flux shielding coils have a first coil group having a small coefficient of coil coupling and a second coil group having a coefficient of coil coupling greater than that of the first coil group. The first coil group is connected in series to the second coil group. External magnetic flux entering the magnetic field imaging space formed by main coils in a pair positioned facing each other is effectively warded off.