Method for production of lenticulated film

Claim 1

A PROCESS FOR THE MANUFACTURE OF DOUBLY LENTICULATED FILM WHICH COMPRISES THE STEPS OF FORMING A FILM WITH ONE LENTICULATED SIDE AND ONE SMOOTH SIDE, APPLYING TO THE SMOOTH SIDE OF THE FILM A LAYER COMPRISING AN ORGANIC COLLID CONTAINING A LIGHT-SENSITIVE SUBSTANCE WHICH WILL HARDEN THE COLLOID ON EXPOSURE TO LIGHT, EXPOSING SAID APPLIED LAYER TO A LIGHT-SOURCE LOCATED AT THE LENTICULATED SIDE OF THE FILM IN POSITION TO FORM AT SAID APPLIED LAYER IMAGES OF THE LIGHT EMITTING SURFACE OF SAID LIGHT-SOURCE AS A PLURALITY OF ADJACENT ILLUMINATED ZONES EQUAL IN NUMBER TO AND PRODUCED BY THE RESPECTIVE LENSES OF THE LENTICULATED SIDE OF THE FILM, WHEREBY THE EXPOSURE OF SAID APPLIED LAYER IS GRADED IN ACCORDANCE WITH THE CONFIGURATION OF THE LENTICULATIONS, PROCESSING THE SO-EXPOSED LAYER TO REMOVE THE UNEXPOSED PORTIONS OF THE ORGANIC COLLOID TO PRODUCE A DOUBLY-LENTICULATED FILM IN WHICH THE HARDENED COLLOID FORMS A LENTICULAR RELIEF CORRESPONDING TO THE ORIGINALLY LENTICULATED SIDE OF THE FILM, AND IMPREGNATING THE DOUBLY-LENTICULATED FILM WITH A LIGHT-SENSITIZING SUBSTANCE.