Linear exposure control system

Details Linear exposure control system Linear exposure control system

1977-03-02

1978-09-12

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 67, 355 69, 355 71, G03B 2776, G03B 2752

Patent

active

041133781

ABSTRACT:
A magnification signal of 64 - 100% is applied as an input parameter to a specially designed relaxation oscillator which produces a pulse train wherein the pulses thereof have a duration which vary in linear fashion with respect to the magnification input signal, the relaxation oscillator employing a constant current source in series relationship with an integrating capacitor which produces a saw tooth signal having a slope which is constant regardless of variations in the amplitude of the magnification input signal. The output pulses from the relaxation oscillator are counted to define an exposure control interval which changes linearly with respect to the input magnification signal.

REFERENCES:
patent: 3795444 (1974-03-01), Glidden et al.
patent: 3884576 (1975-05-01), Mochimaru et al.
patent: 3898006 (1975-08-01), Kimura et al.

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