Camera shutter mechanism

Claim 1

AN EXPOSURE CONTROL MECHANISM FOR PHOTOGRAPHIC APPARATUS, SAID MECHANISM COMPRISING, IN COMBINATION, MEANS PROVIDING AN EXPOSURE APERTURE, AT LEAST TWO SHUTTER BLADES MOUNTED ADJACENT SAID EXPOSURE APERTURE FOR MOVEMENT IN ADJACENT AND SUBSTANTIALLY PARALLEL PLANES OPPOSITELY TO ONE ANOTHER BETWEEN COVERING POSITION AND UNCOVERING POSITIONS RELATIVE TO SAID APERTURE TO EFFECT EXPOSURES THERETHROUGH, FIRST RESILIENT MEANS CONNECTED TO SAID BLADES FOR BIASING THEM INTO COVERING POSITION, MEANS FOR SO MOVING SAID FIRST RESILIENT MEANS AS TO IMPART THROUGH THE LATTER A MOVEMENT FOR DISPLACING SAID SHUTTER BLADES FROM SAID COVERING POSITION, PHOTOSENSITIVE MEANS FOR PRODUCING ELECTRICAL SIGNALS IN ACCORDANCE WITH LIGHT INCIDENT THEREON, MEANS ELECTRICALLY COUPLED WITH SAID PHOTOSENSITIVE MEANS AND HAVING A PORTION THEREOF MOVABLE RESPONSIVELY TO SAID SIGNALS IN A PLANE ADJACENT AND SUBSTANTIALLY PARALLE TO THE PLANES OF MOVEMENT OF SAID BLADES, AN ELONGATED, RESILIENT ELEMENT MOUNTED ON SAID PORTION AND EXTENDING SUBSTANTIALLY PERPENDICULAR TO THE PLANE OF MOVEMENT THEREOF, SAID RESILIENT ELEMENT BEING MOVABLE WITH SAID PORTION AND SO EXTENDING INTO THE PLANES OF MOVEMENT OF SAID BLADES AS TO BE SUBSTANTIALLY SIMULTANEOUSLY ENGAGEABLE WITH SAID BLADES FOR REVERSING THE DIRECTION OF DISPLACING MOVEMENT THEREOF SO THAT SAID SHUTTER BLADES ARE RETURNED TO SAID COVERING POSITION.