Night vision device having improved automatic brightness control

Details Night vision device having improved automatic brightness control Night vision device having improved automatic brightness control

1997-07-28

1999-09-07

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214R, 313103R, H01J 4014

Patent

active

059490632

ABSTRACT:
A night vision device 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.

REFERENCES:
patent: 4037132 (1977-07-01), Hoover
patent: 4442349 (1984-04-01), Blom et al.
patent: 4629881 (1986-12-01), Fairbend et al.
patent: 4935616 (1990-06-01), Scott
patent: 5146077 (1992-09-01), Caserta et al.
patent: 5747792 (1998-05-01), Kintz et al.

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