Self testing phototypesetter flash intensity control system

Details Self testing phototypesetter flash intensity control system Self testing phototypesetter flash intensity control system

1975-12-29

1977-04-26

Gonzales, John

Photocopying

Contact printing

Light boxes

355 68, B41B 1300

Patent

active

040204952

ABSTRACT:
An optical sensor is positioned at the output of a variable magnification optical system which focuses differing character size images upon a photosensitive medium. A reference voltage, which is a function of the proper exposure for a particular photosensitive medium, is compared with the photosensor voltage. The system automatically tests for the correct light flux before each size change by projecting a reference image through the optical system at the photosensor, such image having a relatively low intensity level, so that no output signal is produced by the above-mentioned comparator. The intensity of the reference image is iteratively increased until such output signal is produced by the comparator, thereby to maintain the light intensity at the last level attained, until a character size change is effected, wherein the comparison process is repeated. Upon the substitution of another photosensitive medium having a different sensitivity, the comparator threshold voltage is altered accordingly to produce the proper illumination intensities for various character sizes tailored to the sensitivity of the second photosensitive medium.

REFERENCES:
patent: 3710698 (1973-01-01), Sinnott et al.
patent: 3738242 (1973-06-01), Lee et al.

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