Roll film for photographic cameras

Claim 1

A ROLL FILM FOR USE IN A PHOTOGRAPHIC CAMERA HAVING A MOVABLE FILM METERING MEMBER ADAPTED TO NORMALLY RIDE AGAINST ONE SURFACE OF THE FILM TO STOP THE ADVANCE OF A GIVEN LENGTH OF THE FILM UPON PENETRATION OF THE MEMBER INTO A METERING OPENING THEREIN AND ADAPTED TO BE WITHDRAWN FROM SAID OPENING TO FREE THE FILM FOR A SUBSEQUENT ADVANCE, SAID FILM COMPRISING: A FLEXIBLE SUPPORT WEB HAVING A LIGHT-SENSITIVE LAYER ON THE FRONT SURFACE THEREOF, SAID LAYER INCLUDING AT LEAST ONE LATENT IMAGE DEFINING A PLURALITY OF LIGHT-SENSITIVE EXPOSURE AREAS SPACED ALONG SAID WEB, SAID WEB BEING PROVIDED ALONG EXTENDING THERETHROUGH AND TO BE PENETRATED BY SAID METERING MEMBER, EACH OF SAID OPENINGS BEARING A PREDETERMINED SPATIAL RELATION WITH A CORRESPONDING ONE OF SAID EXPOSURE AREAS; AND A LIGHT PROTECTIVE BACKING STRIP OVERLYING AT LEAST PART OF THE REAR SURFACE OF SAID WEB, A SLIT AREA IN SAID STRIP ADJACENT EACH OF SAID OPENINGS DEFINING AT LEAST TWO UNCONNECTED AND NORMALLY LIGHT-TIGHT SLITS EXTENDING THROUGH SAID STRIP AND SUBSTANTIALLY IN THE SAME DIRECTION, SAID SLITS BEING CONFIGURED SO AS TO ALLOW AT LEAST A PORTION OF THE AREA OF SAID STRIP TO BE DISPLACED FROM CONTACT WITH SAID WB WHEN PRESSURE IS APPLIED TRANSVERSELY OF SAID STRIP BY THE METERING MEMBER IN THE COURSE OF PENETRATION MOVEMENT OF THE MEMBER INTO THE CORRESPONDING OPENING, WITHOUT PERMANENTLY IMPAIRING THE LIGHT PROTECTIVE PROPERTIES OF SAID STRIP IN SAID AREA WHEN THE METERING MEMBER IS WITHDRAWN FROM SAID OPENING.