Switching apparatus having magnetoresistive elements for detecti

Details Switching apparatus having magnetoresistive elements for detecti Switching apparatus having magnetoresistive elements for detecti

1997-03-21

2000-11-21

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420722, 335205, G01B 714, G01B 730, H01H 1364, H01L 4308

Patent

active

06150808&

ABSTRACT:
A switching apparatus is provided which may be used for power window control systems of automotive vehicles. The switching apparatus includes an operating knob, a magnet, a magnetoresistive element, and a position determining circuit. The operating knob is manually shifted between a plurality of switching positions. The magnet moves according to the movement of the operating knob. The magnetoresistive element is placed in a magnetic field applied from the magnet and changes an electrical resistance thereof according to a variation in orientation of a magnetic flux applied to the magnetoresistive element resulting from the movement of the magnet. The position determining circuit monitors a change in electric resistance of the magnetoresistive element to determine the switching position of the operating member.

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patent: 5359287 (1994-10-01), Watanabe et al.
patent: 5570015 (1996-10-01), Takaishi et al.
patent: 5646587 (1997-07-01), Miyazawa et al.

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