Light source unit assembly for photographic enlarger

Details Light source unit assembly for photographic enlarger Light source unit assembly for photographic enlarger

1980-03-03

1981-09-01

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 35, 362 7, 362 18, G03B 2754

Patent

active

042868670

ABSTRACT:
A light source unit assembly for use in a photographic enlarger on the optical axis of its light source between the light source and a negative comprises a first optical system of the semi-diffused illumination type and a second optical system of the diffused illumination type which are incorporated into a unit and alternatively positionable on the optical axis. A diffusing tube housed in a frame is divided into a diffusing chamber for the first optical system and another diffusing chamber having a larger length than the chamber for the second optical system, by a partition having a light diffusing surface on each of its opposite sides. A light passing aperture is opposed to the diffusing surface. A diffusing filter and a condenser are positioned across the path of the light reflected from one of the diffusing surfaces to provide a secondary light source for the semi-diffused illumination system. Another diffusing filter is similarly positioned for the other diffusing surface to provide a secondary light source for the diffused illumination system. One of the two systems is selectively usable on a single enlarger to achieve the desired results.

REFERENCES:
patent: 3782821 (1974-01-01), Bosman
patent: 3892482 (1975-07-01), Weisglass
patent: 4168904 (1979-09-01), Furukawa

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