Magnetic detector wherein the magnetic flux crosses the sensing

Details Magnetic detector wherein the magnetic flux crosses the sensing Magnetic detector wherein the magnetic flux crosses the sensing

1998-09-29

2000-08-29

Patidar, Jay

Electricity: measuring and testing

Magnetic

Displacement

32420725, G01B 714, G01B 730, G01R 3309

Patent

active

061114030

ABSTRACT:
A magnetic detector is disclosed with a power-on function which can essentially eliminate temperature characteristics of a magnetic field sensing device and improve edge detecting accuracy of alternately projected and recessed portions of a moving member of magnetic material. The magnetic detector comprises a magnet for generating a magnetic field, a rotary member of magnetic material disposed with a predetermined gap remaining relative to the magnet and having alternately projected and recessed portions to change the magnetic field generated by the magnet, and a magnetoresistive device comprising a plurality of magnetic field sensing elements and detecting changes in the magnetic field by movement of the rotary member of magnetic material. The magnetic flux crosses the plurality of magnetic field sensing elements at a first predetermined angle when the recessed portion of the moving member of magnetic material is opposed to the magnetic field sensing device, and the magnetic flux crosses the plurality of magnetic field sensing elements at a second predetermined angle when the projected portion of the moving member of magnetic material is opposed to the magnetic field sensing device. The first and second predetermined angles are symmetrical with respect to a direction vertical to a plane in which the plurality of magnetic field sensing elements are arranged.

REFERENCES:
patent: 5477143 (1995-12-01), Wu
patent: 5596272 (1997-01-01), Busch
patent: 5600238 (1997-02-01), Holloway et al.
patent: 5801529 (1998-09-01), Umemoto et al.
"Magnetoresistance of Multilayers" Journal of Applied Magnetism Society of Japan, vol. 15, No. 5, 1991 pp. 813-821.

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