Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1977-06-03
1978-07-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
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
Flint John R.
Rabindran K. George
Bell & Howell Company
Nelms David C.
Samlan Alan B.
Thibault Harry G.
Tokar Michael J.
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