Pole-piece unit, method for assembling the same, and...

Details Pole-piece unit, method for assembling the same, and... Pole-piece unit, method for assembling the same, and...

2005-05-24

2005-05-24

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

C335S297000, C335S301000, C335S304000, C335S306000

Reexamination Certificate

active

06897751

ABSTRACT:
A magnetic field generator comprises a pair of pole-piece units. The pair of pole-piece units respectively include plate yokes. Each of the plate yokes includes a surface facing the other's and provided with a permanent magnet group and a pole piece. The pole piece includes an annular projection having a plurality of annular-projection pieces and a permanent magnet for reduction of magnetic flux leakage installed on an outside surface of each annular-projection piece. The permanent magnet for reduction of magnetic flux leakage may be disposed with a magnetizing direction thereof being slanted with respect to a main surface of the permanent magnet group.

REFERENCES:
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patent: 4672346 (1987-06-01), Miyamoto et al.
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patent: 0 691 548 (1996-01-01), None
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Patent Abstracts of Japan vol. 014, No. 344 (E-0955), Jul. 25, 1990 -& JP 02 117106 A (Shin Etsu Chem Co Ltd), May 1, 1990 *abstract*.
European Search Report dated Feb. 17, 2003.

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