Linear motion generator transducer signal

Claim 1

AN ELECTROMECHANICAL TRANSDUCER COMPRISING A GENERALLY CYLINDRICAL HOUSING OF MAGNETIC MATERIAL HAVING END WALLS, AN ELECTRICAL OUTPUT COIL WITHIN SAID HOUSING, EACH ONE OF SAID END WALLS HAVING A CENTRAL OPENING, ONE OF SAID OPENINGS BEING LARGER THAN THE OTHER ONE THEREOF, AN ARMATURE OF MAGNETIC MATERIAL EXTENDING CENTRALLY THROUGH SAID HOUSING AND HAVING A RELATIVELY NARROW PORTION CLOSELY FITTED AND SLIDABLE IN THE SMALLER ONE OF SAID OPENINGS, SAID ARMATURE HAVING A RELATIVELY WIDE END PORTION LOOSELY FITTED IN THE LARGER ONE OF SAID OPENINGS AND APPROXIMATELY EQUAL IN LENGTH TO THE LENGTH OF SAID LARGER OPENING AS TAKEN IN THE DIRECTION OF THE LENGTH OF THE HOUSING, THE SPACE IN SAID LARGER OPENING BETWEEN THE END WALL THEREOF AND SAID ARMATURE DEFINING A GAP IN THE MAGNETIC FLUX PATH THROUGH SAID HOUSING AND SAID ARMATURE, SAID LARGER OPENING AND SAID WIDE END PORTION OF SAID ARMATURE BEING SHAPED SO THAT RELATIVE MOTION OF SAID ARMATURE ALONG A PREDETERMINED COORDINATE DIRECTION VARIES THE RELUCTANCE OF SAID GAP, AND MEANS FOR PRODUCING A SUBSTANTIALLY CONSTANT MAGNETOMOTIVE FORCE IN SAID FLUX PATH, WHEREBY RELATIVE MOTION OF SAID ARMATURE IN SAID PREDETERMINED DIRECTION PRODUCES AN OUTPUT ELECTRICAL SIGNAL IN SAID COIL DUE TO A CHANGE IN FLUX IN SAID FLUX PATH BROUGHT ABOUT BY A CHANGE IN THE RELUCTANCE OF SAID GAP.