Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1998-01-26
2000-06-06
Gibson, Randy W.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33361, 33363R, 33363Q, 324244, 324259, 324260, G01C 1728, G01R 3302
Patent
active
060703334
ABSTRACT:
An electronic compass has a compass housing. An electronic magnetic field sensor is disposed in a fixed position relative to the compass housing. A magnet is rotatably mounted relative to the magnetic field sensor and independently aligned with a terrestrial magnetic field. The magnet has a magnetic field with a magnetic field direction and the electronic magnetic field sensor is located within a range of influence of the magnetic field. The electronic magnetic field sensor has a first magnetoresistor with a first fixed reference axis and an electric resistance of the first magnetoresistor is a function of a first angle of rotation between the fixed first reference axis and the direction of the magnetic field. The electronic magnetic field sensor defines a first differential bridge circuit and the first magnetoresistor is disposed in the first differential bridge circuit which during operation of the compass, supplies an output voltage dependent on the first angle of rotation. The first differential bridge circuit has a second magnetoresistor, and magnetizations of the first magnetoresistor and the second magnetoresistor are rotated relative to one another.
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Hufgard Erich
Kutzner Michael
Gibson Randy W.
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
Sterner Werner H.
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