| 摘要 |
PROBLEM TO BE SOLVED: To prevent demagnetization of magnets. SOLUTION: A magnetic field element 1a has field parts 2 and coupling parts 3, and can rotate around a rotating shaft 92 along a predetermined direction 91. The field parts 2 has magnets 11 and magnetizer plates 21, 22. Each of the magnets 11 has the first and second pole surfaces 11a, 11b which provide different poles to each other in a predetermined direction 91. Each of the magnetizer plates 21, 22 is provided on each of the first and second pole surfaces 11a, 11b. The field parts 2 are disposed in an annular state around the rotating shaft 92 along a circumferential direction 93, and separated to each other along the circumferential direction 93. The coupling parts 3 consist of a non-magnetic material for coupling field parts 2. COPYRIGHT: (C)2008,JPO&INPIT
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