Illuminating apparatus for photographic enlargers provided with interchangeable integrating bodies

Claim 1

AN ILLUMINATING APPARATUS FOR PHOTOGRAPHIC ENLARGERS COMPRISING A LIGHT SOURCE, A LIGHT COLLECTOR, A NUMBER OF LIGHT INTEGRATING BODIES OF DIFFERENT DIMENSIONS, AND AN APERTURED STAGE ADAPTED TO SUPPORT A NEGATIVE TO TRANSPARENCY, SAID LIGHT COLLECTOR INCLUDING A REFLECTOR FORMED BY A SUBSTANTIALLY ELLIPTICAL SURFACE OF REVOLUTION HAVING A SPECULARLY REFLECTING INTERIOR SURFACE, SAID ELLIPTICAL SURFACE OF REVOLUTION HAVING TWO FOCAL POINTS, SAID LIGHT SOURCE POSITIONED SUBSTANTIALLY AT ONE OF SAID FOCAL POINTS EACH OF SAID INTEGRATING BODIES BEING HOLLOW OF SUBSTAN TIALLY SPHERICAL SHAPE WITH A MATTE DIFFUSELY REFLECTING SUBSTANTIALLY WHITE INTERIOR SURFACE, EACH INTEGRATING BODY INCLUDING MEANS DEFINING A RELATIVELY LARGE APERTURE AND A RELATIVELY SMALL APERTURE, MEANS POSITIONING ANY ONE OF SAID INTEGRATING BODIES IN CLOSE PROXIMITY TO SAID NEGATIVE STAGE WITH SAID LARGE APERTURE IN JUXTAPOSITION AND IN ALIGNMENT WITH THE APERTURE OF SAID NEGATIVE STAGE, AND MEANS TO ADJUST THE POSITION OF SAID LIGHT COLLECTOR WITH RESPECT TO THE POSITION OF SAID INTEGRATING BODY WHEREBY THE SECOND FOCAL POINT OF SAID ELLIPTICAL SURFACE OF REVOLUTION IS SUBSTANTIALLY WITHIN THE AREA OF SAID RELATIVELY SMALL APERTURE.