Protective light filter system for image intensifier

Details Protective light filter system for image intensifier Protective light filter system for image intensifier

1986-07-09

1987-09-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250551, H01J 3150

Patent

active

046957189

ABSTRACT:
The photocathode of an image intensifier is protected from undue exposure to excessive incident light by a variable density filter whose density is controlled by an optical coupler. The optical coupler has an LED which conducts power supply current to the image intensifier and a phototransistor in the energization circuit of a filter driver which operates the variable density filter.

REFERENCES:
patent: 3449619 (1969-06-01), Stalp
patent: 3595146 (1971-07-01), Johnson
patent: 3631252 (1971-12-01), Gebel
patent: 4433236 (1984-02-01), Shimada
patent: 4558226 (1985-12-01), Takada et al.

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