Apparatus for sampling printing light in a photographic enlarger

Details Apparatus for sampling printing light in a photographic enlarger Apparatus for sampling printing light in a photographic enlarger

1977-06-15

1979-08-21

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

356404, G03B 2778

Patent

active

041651758

ABSTRACT:
The color composition of printing light in a photographic enlarger is sampled by rotating a sampling duct between the original image holder and the objective lens. The duct has a thin elongated rectangular shape with a light diffusing aperture disposable in the printing light and with mirrored inside walls, which transmit a representative sample of the printing light to the outlet aperture, which is disposed in front of light measuring receivers. The receivers generate a signal which is processed to govern the insertion of filters in the light-mixing head of the enlarger to provide the desired color composition in the printing light. A convenient push control and actuating switch arrangement is provided to simplify insertion of the duct in the printing light before and its removal during the printing exposure.

REFERENCES:
patent: 2480425 (1949-08-01), Simmon
patent: 3184307 (1965-05-01), Letzer
patent: 3359424 (1967-12-01), Dreyfoos
patent: 3779146 (1973-12-01), Trankner
patent: 3985450 (1976-10-01), Barbieri et al.
patent: 4030833 (1977-06-01), Barbieri

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