Method of and apparatus for controlling the exposure time in an

Details Method of and apparatus for controlling the exposure time in an Method of and apparatus for controlling the exposure time in an

1975-08-12

1977-04-19

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 71, G03B 2778

Patent

active

040185265

ABSTRACT:
This invention relates to a method of controlling the exposure time in apparatuses for the re-enlargement of a microfilm in which the density of the microfilm is ascertained during exposure and the exposure time is controlled in accordance with the ascertained density, which comprises guiding a light-sensitive measuring unit, during a minimum exposure time needed and at a short distance above a light-sensitive recording material, and simultaneously measuring the density of the microfilm with the light-sensitive measuring unit, the signals measured by the light-sensitive measuring unit, which correspond to the areas of the microfilm having the maximum or minimum density, determining the exposure time. The invention also relates to an apparatus for performing the method.

REFERENCES:
patent: 3702732 (1972-11-01), Sliwkowski
patent: 3704947 (1972-12-01), Reinour
patent: 3728023 (1973-04-01), Stevko et al.
patent: 3914049 (1975-10-01), Basu et al.
patent: 3947112 (1976-03-01), Hahn et al.

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