Patent ID: 8884256
Filing Date: 2014-11-11
Classification: A61N,H05H

Abstract:
1. A septum magnet comprising: a yoke that (i) is arc-shaped, (ii) defines a gap portion at an outer circumference side thereof and extending in a circumferential direction thereof, and (iii) is configured to be separated at approximately a center portion thereof in an axial direction; a septum coil provided inside the gap portion but at an outer side thereof in a radial direction and in which an electric current flows in one direction in the circumferential direction; a return coil, in which an electric current flows in an opposite direction to that of the electric current in the septum coil, provided inside the gap portion in such a way as to (i) be at the inner side thereof in the radial direction and (ii) face the septum coil with a predetermined distance; and a vacuum duct provided within the gap portion such that it is inserted between the septum coil and the return coil, wherein