Display module having electromagnetic coil sensing of armature position

Claim 1

A MAGNETIC DEVICE COMPRISING: A PAIR OF LEGS, EACH LEG HAVING A POLE PIECE AT THE END THEREOF, SAID POLE PIECES BEING SPACED, MAGNETIC MEANS FOR CAUSING SAID POLE PIECES TO BE OPPOSITELY MAGNETIZED, AN ARMATURE OF MAGNETIC MATERIAL, MEANS FOR MOUNTING SAID ARMATURE SO THAT IT MAY ASSUME EITHER ONE OF TWO POSITIONS OF REST, SAID ARMATURE BEING IN CONTACT WITH ONE OF SAID POLE PIECES IN ONE OF ITS POSITIONS OF REST AND BEING IN CONTACT WITH THE OTHER OF SAID POLE PIECES IN THE OTHER OF ITS POSITIONS OF REST, SAID ARMATURE BEING MANUALLY MOVEABLE FROM ONE POSITION OF REST TO THE OTHER OF SAID POSITIONS OF REST, MEANS FOR MOVING SAID ARMATURE FROM ONE POSITION OF REST TO THE OTHER COMPRISING A COIL SURROUNDING ONLY SAID ARMATURE AND MEANS TO CAUSE CURRENT TO FLOW THROUGH SAID COIL IN SUCH A DIRECTION AS TO BUILD UP A FLUX IN SAID ARMATURE THAT REPELS SAID ARMATURE FROM ITS CONTACTING POLE PIECE AND ATTRACTS THE ARMATURE TO THE OTHER OF SAID POLE PIECES, AND MEANS TO SENSE THE POSITION OF SAID ARMATURE COMPRISING A COIL SURROUNDING AT LEAST ONE OF SAID LEGS.