| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized and low-priced magnetic circuit capable of improving a gap magnetic flux density while including the magnetism-proof effect. SOLUTION: A magnetic circuit 1 includes: a bottom yoke 2; a center pole 3 projected in a front side central portion of the bottom yoke 2; an annular main magnet 4 disposed on a front face of the bottom yoke 2; an annular top plate 5 disposed on a front face of the main magnet 4; a repulsion magnet 6 disposed on the back of the bottom yoke 2; and a yoke cover 7 disposed to cover the back and the side surface of the repulsion magnet 6. An outer diameter of the yoke cover 7 is made smaller than or equal with that of the main magnet 4, such that a magnetic flux density in a gap (g) can be improved and the magnetic circuit 1 with high magnetism efficiency can be obtained. COPYRIGHT: (C)2008,JPO&INPIT
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