Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1998-02-18
2000-07-11
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214R, H01J 4014
Patent
active
060876492
ABSTRACT:
A night vision device with an image intensifier tube includes an improved power supply which operates the image intensifier tube of the device according to a variable duty cycle either at a design voltage level for the tube or at a voltage level simulating a dark-field. This duty cycle variation is effected as a function of the current flow in the image intensifier tube in order to provide automatic brightness control and bright source protection. An improved service life for the image intensifier tube is achieved. Also, a microchannel plate of the image intensifier tube need not carry an ion barrier film, resulting in an improved light amplification for the image intensifier tube.
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Estrera Joseph P.
Saldana Michael R.
Sinor Timothy W.
Le Que T.
Litton Systems Inc.
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