Exposure control systems for use in copying machine

Details Exposure control systems for use in copying machine Exposure control systems for use in copying machine

1981-07-08

1983-01-04

Moses, R. L.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 14E, 355 55, G03G 1500, G03B 2754, G03B 2752

Patent

active

043670385

ABSTRACT:
In a copying machine of the type comprising an image projecting lens movable in a direction of an optical axis thereof for varying a magnifying power, a reflecting mirror interlocked with the lens for effecting focusing, and two groups of light sources for illuminating a manuscript, there is provided an exposure control system comprising variable resistors driven by the projecting lens, oscillators for generating pulse signals of frequencies varying in accordance with resistance variations of the variable resistors and with a variation in a source voltage, counters counting the number of the pulse signals in accordance with an exposure index, and switch means for lighting the light sources during intervals determined by an exposure index.

REFERENCES:
patent: 3795444 (1974-03-01), Glidden et al.
patent: 3884576 (1975-05-01), Mochimaru et al.
patent: 4113378 (1978-09-01), Wirtz

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