Magnetoresistance sensing device with increased magnetic field d

Details Magnetoresistance sensing device with increased magnetic field d Magnetoresistance sensing device with increased magnetic field d

1996-10-31

1998-08-04

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

324252, 338 32R, G01B 714, G01R 3306, F02B 5306

Patent

active

057899193

ABSTRACT:
The invention provides a sensing device capable of outputting a high-accuracy signal precisely corresponding to a particular position (angle) of a rotating member made of a magnetic material without being disturbed by external noise. The sensing device includes: a magnet for generating a magnetic field; a rotating member made of a magnetic material, for changing the magnetic field generated by the magnet, the rotating member being disposed a predetermined distance apart from the magnet; and a giant magnetoresistance device whose resistance changes in response to the change in the magnetic field caused by the rotating member of magnetic material, wherein the size L.sub.3 of the magnetic field sensing plane of the giant magnetoresistance device is set to a value less than the smallest value of the dimensions L.sub.1 and L.sub.2 of the protruding and recessed portions of the rotating member of magnetic material, that is, the size L.sub.3 of the magnetic field sensing plane is set so that the following conditions are satisfied: L.sub.3 .ltoreq.L.sub.1 and L.sub.3 .ltoreq.L.sub.2.

REFERENCES:
patent: 5475304 (1995-12-01), Prinz
patent: 5477143 (1995-12-01), Wu
Journal of Magnetics Society of Japan, vol. 15, No. 5, 1991, pp. 813 to 820 (no translation).

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