Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches – Plural magnets
Reexamination Certificate
2005-05-31
2005-05-31
Donovan, Lincoln (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
Plural magnets
C335S205000
Reexamination Certificate
active
06900713
ABSTRACT:
A magnetic switch using magnetoresistive elements having respective free layers whose magnetization directions are varied by an external magnetic field. The magnetic switch also has a first magnet and a second magnet that produce respective magnetic fields that serve as the external magnetic field and are different from each other in strength and opposite to each other in direction, and a magnetic shield member whose relative position with respect to the first magnet and the second magnet varies. The magnetic shield member moves between a first position with which both of the magnetic fields of the first magnet and the second magnet act on the magnetoresistive elements to magnetize their free layers in a first direction and a second position with which only one of the magnetic fields of the first magnet and the second magnet acts on the magnetoresistive elements to magnetize their free layers in a second direction that is opposite to the first direction.
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Kasashima Masao
Kikuchi Seiji
Okumura Hirofumi
Tokunaga Ichiro
Alps Electric Co. ,Ltd.
Beyer Weaver & Thomas LLP
Donovan Lincoln
Rojas Bernard
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