Bright source attenuating device for an image intensifier

Details Bright source attenuating device for an image intensifier Bright source attenuating device for an image intensifier

1979-06-22

1981-06-09

Davie, James W.

350363, G02F 117

Patent

active

042721644

ABSTRACT:
A device for responding to visible bright light and attenuating these bright lights over a spectral region wherein image intensifiers and the like are sensitive, including the near-infrared, to reduce glare and halation prior to entering the image intensifier and a method of manufacture of said device. The device is comprised of some electrochromic (EC) material sandwiched between two light transparent conductive means wherein one light transparent conductive means has a photoconductive coating in direct contact with the EC material. With a voltage source applying voltage across said two light transparent conductive means, this device remains transparent at low light levels, but when an incoming bright spot is focused on the device, the photoconductive coating conducts at the focal point and the EC material becomes dark at that point, thus absorbing the bright spot. When the bright spot is removed, the darkened area becomes transparent again.

REFERENCES:
patent: 3373091 (1968-03-01), Findl
patent: 3521941 (1970-07-01), Deb et al.
patent: 3589896 (1971-06-01), Wilcox
M. Yamana, "New Photoelectrochemical Display", Applied Physics Letters, v 29, No. 9, Nov. 1, 1976, pp. 570-571.

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