Analog to digital conversion apparatus

Claim 1

APPARATUS FOR PROVIDING A DIGITAL INDICATION OF THE ANGULAR DISPLACEMENT OF A FIRST MEMBER WITH RESPECT TO A SECOND MEMBER COMPRISING A FIRST MAGNETIC FLUX SENSING HEAD MOVABLE IN ACCORDANCE WITH THE MOVEMENT OF SAID FIRST MEMBER, A SECOND MAGNETIC FLUX SENSING HEAD MOVABLE IN ACCORDANCE WITH THE MOVEMENT OF SAID SECOND MEMBER A DISC COOPERATING WITH SAID FIRST AND SECOND MAGNETIC FLUX SENSING HEADS FOR PROVIDING DIGITAL INFORMATION ON THE DISPLACEMENT OF SAID FIRST MEMEER RELATIVE TO SAID SECOND MEMBER, SAID DISC INCLUDING FIRST AND SECOND TRAINS OF INDICIA OF EQUAL ANGULAR LENGTH RECORDED ON OPPOSITE RADIAL SURFACES THEREOF, EACH TRAIN OF INDICIA BEING MAGNETICALLY RECORDED THEREON IN AN ENDLESS SERIES AND INCLUDING A SINGLE INDEX INDICATION, AND EACH SAID INDICIUM BEING RECORDED IN THE FORM OF A SINE WAVE WITH THE PEAKS OF EACH SINE WAVE EQUALLY SPACED IN EACH SAID SERIES AND ONE SERIES INCLUDING ONE MORE INDICIUM THAN THE NUMBER OF INDICIA IN THE OTHER SERIES, STRUCTURE ENCLOSING SAID DISC AND FLUX SENSING HEADS AND SECURED TO SAID FIRST MEMBER, SAID FIRST FLUX SENSING HEAD BEING MOUNTED ON SAID ENCLOSING STRUCTURE FOR ROTATION THEREWITH ABOUT A PREDETERMINED AXIS, SAID SECOND FLUX SENSING HEAD BEING MOUNTED WITHIN SAID ENCLOSURING STRUCTURE FOR ROTATION INDEPENDENTLY THEREOF ABOUT SAID AXIS AND SAID DISC BEING POSITIONED BETWEEN SAID FIRST AND SECOND FLUX SENSING HEADS AND MOUNTED FOR ROTATION ABOUT SAID AXIS, DRIVE MEANS FOR SAID DISC EXTENDING FROM SAID ENCLOSING STRUCTURE IN ONE DIRECTION ALONG SAID AXIS, AND DRIVE MEANS FOR SAID SECOND FLUX SENSING HEAD EXTENDING FROM SAID ENCLOSING STRUCTURE IN THE OPPOSITE DIRECTION ALONG SAID AXIS,