Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Reexamination Certificate
2005-05-03
2008-11-25
Barrera, Ramon M (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
Reexamination Certificate
active
07456715
ABSTRACT:
There is provided in accordance with the present invention a magnetic encoder (10) including a ring-shaped multipolar magnet (14) having a plurality of opposite magnetic poles alternating with each other in a direction circumferentially thereof, and a core metal (11) for supporting the multipolar magnet (14). The multipolar magnet (14) is prepared from a sintered element that is formed by molding under pressure a powdery mixture of a powdery magnetic material and a binder containing a powdery non-magnetic metallic material to provide a green compact and then sintering the green compact to provide the sintered element. The green compact is molded by the application of a molding force of not lower than 65 tons and the binder has a particle size smaller than 40 μm. The sintered element has a density preferably not smaller than 6.6 g/cm3.
REFERENCES:
patent: 2003/0059139 (2003-03-01), Nakajima
Hideo Mizuto, Patent Abstracts of Japan, “Bearing Seal Having Rotation Detecting Device”, Publication No. 05-238369, Publication Date: Sep. 17, 1993.
Tatsuo Nakajima, et al., Patent Abstracts of Japan,“Magnetic Encoder and Wheel Bearing Provided With Encoder”, Publication No. 2004-084925 and Publication Date: Mar. 18, 2004.
Barrera Ramon M
NTN Corporation
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