Exposure control method for an automatic color printer with slop

Details Exposure control method for an automatic color printer with slop Exposure control method for an automatic color printer with slop

1978-09-06

1980-06-10

Hix, L. T.

Photocopying

Projection printing and copying cameras

Methods

355 38, G03B 2778

Patent

active

042069980

ABSTRACT:
The density of a negative is measured by a photocell and log converted through a log conversion amplifier. The log converted density is then converted with a properly selected gain to a value suitable for slope control. The converted value is exponential converted to a value indicative of the amount of the light transmitting through the negative. The exponential converted value is integrated to be compared with a preselected value to determine the exposure time.

REFERENCES:
patent: 2995978 (1961-08-01), Glandon et al.
patent: 3482916 (1969-12-01), Mey et al.
patent: 3873199 (1975-03-01), Weinert
patent: 3936842 (1976-02-01), Nanba et al.

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