Light mixing system for a photographic enlarger

Details Light mixing system for a photographic enlarger Light mixing system for a photographic enlarger

1979-06-14

1980-12-23

Griffin, Donald A.

Photocopying

Including fiber optics

355 35, 355 71, G03B 2776, G03B 2772, G03B 2700

Patent

active

042407389

ABSTRACT:
A light mixing system for use in a photographic enlarger in which light from a light source is admitted to a light mixing module through an aperture (and/or through a light modifying filter system for color correction for color enlargements) to mix light beams to provide substantially uniform energy distribution at the outlet port of the light mixing module. The light mixing module includes a lens having a conical surface to receive the admitted light beams and to direct the light beams along angular paths with respect to the axis of the conical surface. The lens interfaces with a diffuser means comprising a multitude of fiber optic elements each adapted to receive light beams along the angular path, to transmit and reflect the light beams and to cause the light beams to depart the exit end of the fiber optic element in the form of a fan or cone of substantially the same angle as that of the light beams at the lens for mixing said beams. A light guide means further mixes the exiting mixed light beams from the fiber optic diffuser and exits such beams into a frustoconical chamber having light reflecting and diffusing surfaces to provide an evenly distributed diffuse secondary light source of expanded areas.

REFERENCES:
patent: 606593 (1898-06-01), Stender
patent: 2327818 (1943-08-01), Peterson
patent: 3184753 (1965-05-01), Koster
patent: 3273451 (1966-09-01), Wilson
patent: 3279311 (1966-10-01), Lichtner
patent: 3492070 (1970-01-01), Zahn
patent: 3561867 (1971-02-01), Simmon
patent: 3756712 (1973-09-01), Weisglass et al.
patent: 3756719 (1973-09-01), Harter
patent: 3880520 (1975-04-01), Weisglass
patent: 3927941 (1975-12-01), Yamaguchi
patent: 4131362 (1978-12-01), Gandini

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