Magnetic sensing device unaffected by positioning error of magne

Details Magnetic sensing device unaffected by positioning error of magne Magnetic sensing device unaffected by positioning error of magne

1997-07-09

2000-08-22

Patidar, Jay

Electricity: measuring and testing

Magnetic

Displacement

32420725, 3242072, G01B 714, G01B 730

Patent

active

061077933

ABSTRACT:
A sensing device outputs a square wave signal whose edges exactly correspond to edges of protruding or recessed portions of a rotary magnetic-material member, regardless of the positioning accuracy of a magnetic field detecting element with respect to the location of a magnet. The sensing device includes: a magnet for generating a magnetic field; a rotary magnetic material member for changing the magnetic field generated by the magnet, the rotary magnetic material member being disposed a predetermined distance apart from the magnet; and a magnetic field detecting element whose resistance changes in response to the change in the magnetic field induced by the magnetic field variation inducing means; wherein the surface of the magnet facing the magnetic field detecting element is slanted.

REFERENCES:
patent: 5021736 (1991-06-01), Gonsalves et al.
Journal of Magnetics Society of Japan, vol. 15, No. 5, 1991 "Magnetoresistance of Multilayers".

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