Protective light filter system for image intensifier
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United States of America Patent
Stats
-
Sep 22, 1987
Grant Date -
N/A
app pub date -
Jul 9, 1986
filing date -
Jul 9, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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