Hall effect device utilized to compensate for variable induced fields in other sensors

Claim 1

A DEVICE FOR SENSING MAGNETIC VARIATIONS COMPRISING A STRIP OF SEMI-CONDUCTOR MATERIALHAVING A PAIR OF OPPOSITELY DISPOSED RELATIVELY FLAT FACES, A PAIR OF SPACED SIDE EDGES SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS OF SAID STRIP AND A PAIR OF OPPOSITE END EDGES TRANSVERSE TO SAID SIDE EDGES, A PAIR OF CONCENTRATOR RODS DISPOSED ADJACENT OPPOSITE FACES OF SAID STRIP AND ELECTRICALLY INSULATED THEREFROM, MEANS FOR CONNECTING THE END EDGES IN SERIES WITH AN ELECTRICAL POWER SUPPLY SUCH THAT A SUPPLY CURRENT FLOWS THROUGH THE SEMI-CONDUCTOR STRIP, OUTPUT HALL ELECTRODES ON SAID SIDE EDGES, AND A COIL SERIALLY CONNECTED WITH SAID STRIP AND POWER SUPPLY AND HAVING THE WINDINGS THEREOF DISPOSED ABOUT ONE OF SAID CONCENTRATOR RODS THE NUMBER OF WINDING TURNS IN SAID COIL AND THE CONNECTION THEREOF BEING SUCH THAT THE MAGNETIC FIELD OF SAID COIL OPPOSES AND SUBSTANTIALLY CANCELS A COMPONENT OF THE MAGNETIC FIELD SET UP BY THE ELECTRICAL POWER SUPPLY.

Claim 2

A DEVICE FOR SENSING MAGNETIC VARIATIONS COMPRISING A STRIP OF SEMI-CONDUCTOR MATERIALHAVING A PAIR OF OPPOSITELY DISPOSED RELATIVELY FLAT FACES, A PAIR OF SPACED SIDE EDGES SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS OF SAID STRIP AND A PAIR OF OPPOSITE END EDGES TRANSVERSE TO SAID SIDE EDGES, A PAIR OF CONCENTRATOR RODS DISPOSED ADJACENT OPPOSITE FACES OF SAID STRIP AND ELECTRICALLY INSULATED THEREFROM, MEANS FOR CONNECTING THE END EDGES IN SERIES WITH AN ELECTRICAL POWER SUPPLY SUCH THAT A SUPPLY CURRENT FLOWS THROUGH THE SEMI-CONDUCTOR STRIP, OUTPUT HALL ELECTRODES ON SAID SIDE EDGES, AND A COIL SERIALLY CONNECTED WITH SAID STRIP AND POWER SUPPLY AND HAVING THE WINDINGS THEREOF DISPOSED ABOUT ONE OF SAID CONCENTRATOR RODS THE NUMBER OF WINDING TURNS IN SAID COIL AND THE CONNECTION THEREOF BEING SUCH THAT THE MAGNETIC FIELD OF SAID COIL OPPOSES AND SUBSTANTIALLY CANCELS A COMPONENT OF THE MAGNETIC FIELD SET UP BY THE ELECTRICAL POWER SUPPLY.