Control system for an image detector

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit

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Details

250214C, 328147, 328151, 307290, 307311, 307351, 307360, H01J 3912

Patent

active

041017633

ABSTRACT:
A control system is described for converting the output current of a photosensitive image detector to an image location voltage of predetermined first and second levels in response to the image detector receiving high and low levels of light, respectively. The image location voltage is developed by passing the output current from the image detector, as well as a selectively variable control current, through an impedance such that increases and decreases in the amplitude of the control current result in corresponding decreases and increases, respectively, in the level of the image location voltage. To change the level of the image location voltage, the amplitude of the control current is caused to be proportional to the charge on a charge storing element and the latter is rapidly and alternately charged and discharged within predetermined limits to vary the amplitude of the control current, and thus the level of the image location voltage. By so varying the charge on the charge storing element, the image location voltage is caused to have an average value which is substantially equal to the first predetermined level when the image detector receives a relatively high level of light, and an average value which is substantially equal to the second predetermined level when the image detector receives a relatively low level of light.

REFERENCES:
patent: 3821547 (1974-06-01), Shenk

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