| 摘要 |
PROBLEM TO BE SOLVED: To further improve a uniformity in the magnetic field in a magnetic circuit with counter permanent magnets. SOLUTION: The magnetic circuit 1 with counter permanent magnets comprises a pair of permanent magnets 2 which are made to face each other isolated with a clearance and magnetized across the thickness thereof, a yoke 3 which is provided outside the permanent magnets and the clearance and magnetically linked to the permanent magnets and a pair of magnetic pole pieces 4 which are respectively disposed on the surface sides facing each other of the permanent magnets and each have a peripheral protrusion part in the direction of facing each other. It also comprises a base 5 made of a non-magnetic material for supporting the magnetic circuit. COPYRIGHT: (C)2005,JPO&NCIPI
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