Magnetic field sensing apparatus

Details Magnetic field sensing apparatus Magnetic field sensing apparatus

1975-07-18

1978-03-14

Curtis, Marshall M.

Communications: electrical

Digital comparator systems

365 97, 235449, 338 32R, G11C 1114

Patent

active

040793605

ABSTRACT:
Apparatus is provided for producing an output signal upon sensing the proximity of a source of magnetic field. The apparatus includes a magnetoresistive element which is comprised of an insulating substrate upon which first and second ferromagnetic strips are provided. The ferromagnetic strips define first and second main current conducting paths which are respectively perpendicular to each other. The strips are connected in series to define a junction therebetween from which an output signal is derived. Current supply terminals are provided for furnishing an energizing current to the magnetoresistive element. Impedances are connected in parallel with the series-connected strips to thereby form a bridge circuit with the ferromagnetic strips, the junction between the strips serving as a bridge output terminal. A generator magnet has a surface disposed in a plane spaced from the magnetoresistive element and produces a magnetic field which is sensed by the element. An output signal is produced from the junction in the element as a function of the relative positions of leading and trailing edges of the generator magnet with respect to a leading edge of the magnetoresistive element.

REFERENCES:
patent: 3736419 (1973-05-01), Almasi et al.
patent: 3928836 (1975-12-01), Makino et al.

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