| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnetic field generator and a method for manufacturing the same, capable of reducing decline in the magnetic field intensity and deterioration of magnetic field uniformity after transportation. <P>SOLUTION: The magnetic field generator 10 includes a pair of magnetic pole units 11a, 11b. The pair of magnetic pole units 11a, 11b include a pair of plate yokes 12a, 12b. Permanent magnet groups 14a, 14b are disposed on the opposite face sides of the pair of plate yokes 12a, 12b, respectively, and magnetic pole plates 16a, 16b are fixed on the opposite face sides of the permanent magnet groups 14a, 14b, respectively. The permanent magnet groups 14a, 14b comprise a permanent magnet 18. The magnetic pole plates 16a, 16b comprise an annular projection 24 and a permanent magnet 28 for preventing a leakage flux provided on the outside face of the annular projection 24. The permanent magnets 18, 28 comprise an R-Fe-B based magnet with a magnetization rate of 80% or more and 99.9% or less. During manufacture, the assembled magnetic pole units 11a, 11b are heated at 40°C or more and 70°C or less. <P>COPYRIGHT: (C)2008,JPO&INPIT |
