Magnetic position detector using a thin film magnetoresistor ele

Details Magnetic position detector using a thin film magnetoresistor ele Magnetic position detector using a thin film magnetoresistor ele

1985-01-25

1988-02-16

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324252, 338 32R, G01B 714, G01R 3302

Patent

active

047257768

ABSTRACT:
A magnetic detector of the present invention employs magneto-resistive elements and detects magnetic teeth of an object to be detected, and more particularly, a constant DC magnetic field is supplied to the magneto-resistive elements in such a way so as to avoid a non-linear region of the DC magnetic field to permit the use of such elements in the region exhibiting good linearity. The present invention provides the DC magnetic field to the magneto-resistive elements by employing a simple structure wherein the magneto-resistive elements are arranged inclined relative to the magnetic field defined between a permanent magnet and the magnetic teeth. Furthermore, the magneto-resistive elements having two phases delayed by .pi./2 are used in a half-bridge so as to improve the stability, waveform distortion, etc. with respect to the temperature of the detected signal.

REFERENCES:
patent: 4492922 (1985-01-01), Ohkubo
patent: 4506217 (1985-03-01), Rothley et al.

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