Magneto-electric signal transmission system

Claim 1

A MAGNETO-ELECTRIC SIGNAL TRANSMISSION APPARATUS, COMPRISING A MAGNETIC SIGNAL TRANSMITTER AND A PICKUP DEVICE FOR RESPONSE TO MAGNETIC SIGNALS ISSUING FROM SAID SIGNAL TRANSMITTER ALONG A GIVE PATH OF RELATIVE MOTION, THE PICKUP DEVICE COMPRISING A HALL PLATE OF SEMICONDUCTOR MATERIAL DISPOSED TRANSVERSELY TO SAID PATH OF RELATIVE MOTION, SAID HALL PLATE HAVING CURRENT SUPPLY TERMINALS DEFINING A CURRENT AXIS WHICH IS TRANSVERSE TO THE DIRECTION OF SAID RELATIVE MOTION AND WHICH IS LONGITUDINAL TO THE SURFACE OF SIGNAL TRANSMITTER, THE HALL PLATE HAVING HALL VOLTAGE ELECTRODE MEANS FOR PRODUCING A HALL VOLTAGE IN RESPONSE TO THE MAGNETIC SIGNALS SAID SIGNAL TRANSMITTER COMPRISING TWO PERMANENT MAGNETS MOUNTED WITH THEIR MAGNETIC AXES TRANSVERSE TO SAID PATH OF RELATIVE MOTION AND WITH MUTUALLY OPPOSED POLARITIES BESIDE EACH OTHER AND FORMING A NARROW FIELD GAP BETWEEN RESPECTIVE ADJACENT POLES OF OPPOSITE POLARITIES, SAID FIELD GAP FACING SAID PATH OF RELATIVE MOTION AND SAID PERMANENT MAGNETS PROVIDING A MAGNETIC FIELD HAVING FLUX LINES WHICH CUT SAID HALL PLATE SUBSTANTIALLY PERPENDICULARLY THERETO WHEREBY THE HALL VOLTAGE OF SAID HALL PLATE PASSES THROUGH A MAXIMAL MAGNITUDE WHEAN SAID PICKUP NDEVICE AND SAID FIELD GAP PASS BY EACH OTHER.