Light measuring structures for motion picture cameras

Claim 1

IN A MOTION PICTURE CAMERA, IN COMBINATION, AN OBJECTIVE AND A FILM-EXPOSING APERTURE LOCATED ALONG THE OPTICAL AXIS OF SAID OBJECTIVE AND THROUGH WHICH FILM IS EXPOSED; SHUTTER MEANS MOVING CYCLICALLY BETWEEN SAID APERTURE AND OBJECTIVE FOR COVERING AND UNCOVERING SAID APERTURE DURING EACH CYCLE OF OPERATION OF SAID SHUTTER MEANS SO THAT FILM IS EXPOSED ONLY WHEN SAID APERTURE IS UNCOVERED, SAID SHUTTER MEANS HAVING A REST POSITION COVERING SAID APERTURE AND SAID SHUTTER MEANS HAVING DIRECTED TOWARD SAID OBJECTIVE A LIGHT-REFLECTING SURFACE WHICH REFLECTS LIGHT RECEIVED FROM SAID OBJECTIVE WHEN SAID SHUTTER MEANS IS BETWEEN SAID APERTURE AND SAID OBJECTIVE; PHOTOSENSITIVE MEANS RECEIVING LIGHT FROM SAID SURFACE OF SAID SHUTTER MEANS; MEASURING MEANS COOPERATING WITH SAID PHOTOSENSITIVE MEANS FOR MEASURING THE LIGHT RECEIVED THEREBY; LIGHT REDUCING MEANS MOVABLE WITH RESPECT TO SAID SHUTTER MEANS BETWEEN AN INACTIVE POSITION OUT OF THE PATH OF LIGHT DIRECTED TOWARD SAID PHOTOSENSITIVE MEANS AND AN ACTIVE POSITION IN WHICH SAID LIGHT REDUCING MEANS IS LOCATED AT LEAST PARTLY IN THE PATH OF THE LIGHT DIRECTED TOWARD SAID PHOTOSENSITIVE MEANS; AND OPERATING MEANS FOR MOVING SAID LIGHT REDUCING MEANS FROM SAID ACTIVE TO SAID INACTIVE POSITION THEREOF WHEN SAID SHUTTER MEANS IS MOVED CYCLICALLY AND FOR MOVING SAID LIGHT REDUCTING MEANS FROM SAID INACTIVE TO SAID ACTIVE POSITION THEREOF WHEN SAID SHUTTER MEANS ASSUMES ITS REST POSITION TO REDUCE THE AMOUNT OF LIGHT RECEIVED BY SAID PHOTOSENSITIVE MEANS WHEN SAID SHUTTER MEANS IS IN ITS REST POSITION TO THE AMOUNT OF LIGHT RECEIVED BY SAID PHOTOSENSITIVE MEANS DURING EACH CYCLE OF OPERATION OF SAID SHUTTER MEANS.