Illuminating system for photographic printers and enlargers

Abstract

Abstract AN ILLUMINATING SYSTEM FOR PHOTOGRAPHIC PRINTERS AND ENLARGERS INCLUDES A SINGLE SOURCE OF LIGHT, A LIGHT COLLECTOR AND A LIGHT INTEGRATOR. THE LIGHT INTEGRATOR HAS A RELATIVELY SMALL ENTRANCE WINDOW AND A RELATIVELY LARGER LIGHT EXIT WINDOW. THE SINGLE SOURCE OF LIGHT, THE LIGHT COLLECTOR, AN APERTURE REDUCER, IN THE FORM OF AN INVERTED, TRUNCATED CONE OR POLYGONAL PYRAMID OF CLEAR TRANSPARENT MATERIAL WITH AN INDEX OF REFRACTION LARGER THAN UNITY, AND A LIGHT DISTRIBUTOR, IN THE FORM OF A POLYGONAL PYRAMID OR PREFERABLY A CONE, WITH A SPECULARLY REFLECTING EXTERIOR SURFACE, ARE POSITIONED ON A COMMON AXIS PASSING THROUGH THE CENTER OF THE LIGHT ENTRANCE WINDOW AND THE LIGHT EXIT WINDOW OF THE INTEGRATOR, WHICH IS THE FORM OF A MODIFIED HOLLOW SPHERE HAVING A DIFFUSELY REFLECTING INTERIOR SURFACE. THE APERATURE REDUCER GREATLY REDUCES THE REQUIRED SIZE OF THE LIGHT ENTRANCE WINDOW OF THE LIGHT INTEGRATOR, AND THE LIGHT DISTRIBUTOR PROVIDES FOR THE SAME LIGHT INTEGRATION EFFECT TO BE OBTAINED WITH A SINGLE LIGHT SOURCE AS HITHERTO OBTAINABLE WITH TWO LIGHT SOURCES.

Inventors

• 👤 Alfred Simmon

Bibliographic Details