| 摘要 |
PROBLEM TO BE SOLVED: To provide a permanent bolt rod facilitating the adjustment of a magnetic field. SOLUTION: This opposed permanent magnet type magnetic circuit 1 is provided with a pair of permanent magnets 2 opposed to each other with a cavity formed therebetween and magnetized in the thickness direction, yokes 3 provided outside the permanent magnets and the cavity and magnetically connected to the permanent magnets, a pair of magnetic pole pieces 4 provided on the opposed face sides of the permanent magnets respectively and having circumferential projections in the opposed direction, and adjustment permanent magnet pieces 6 provided magnetically in contact with the magnetic field formed in the cavity and having a magnetic flux quantity of 2x10<SP>-7</SP>Wb or less. COPYRIGHT: (C)2005,JPO&NCIPI
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