Automatic brightness control and warning circuit for image inten

Details Automatic brightness control and warning circuit for image inten Automatic brightness control and warning circuit for image inten

1981-12-15

1984-02-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

H01J 314

Patent

active

044332360

ABSTRACT:
In an automatic brightness control feedback loop for controlling the bias voltage of a microchannel plate of an image intensifier tube, there are provided a gas discharge tube and a photoconductor which is photoelectrically coupled with the gas discharge tube. The brightness of the gas discharge tube is controlled depending on the phosphor screen current. An ordinary automatic brightness control and also the blinking when the incident light is excessive can be made by having the bias voltage of the microchannel plate depend on the resistance of the photoconductor.

REFERENCES:
patent: 3739178 (1973-06-01), Chow
patent: 4166213 (1979-08-01), Hoover

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