Method for controlling an exposure time in consideration of the

Details Method for controlling an exposure time in consideration of the Method for controlling an exposure time in consideration of the

1983-06-13

1985-06-25

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Methods

355 35, G03B 2732

Patent

active

045250650

ABSTRACT:
Controlling the exposure time in the reciprocity law failure range of a photosensitive material, in a picture reproducing machine, wherein the response time variation cause by variations is corrected according to the operational equation for the reciprocity law when the photosensitive material is in its linear range, by exposing said photosensitive material for a time t.sub.m in accordance with the relationship; ##EQU1## wherein T.sub.0 is the correct exposure time in the absence of reciprocity law failure, M.sub.i is the desired reproduction scale and P is an empirically determined coefficient which is greater for enlargements than reductions.

REFERENCES:
patent: 3443868 (1969-05-01), Mitchell
patent: 3873199 (1975-03-01), Weinert
patent: 4025190 (1977-05-01), Hughes
patent: 4068943 (1978-01-01), Gyori
patent: 4149799 (1979-04-01), Pone et al.
patent: 4175856 (1979-11-01), Pone
patent: 4206998 (1980-06-01), Tokuda

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