Image intensifier tube with entrance screen photocathode which i

Details Image intensifier tube with entrance screen photocathode which i Image intensifier tube with entrance screen photocathode which i

1994-07-13

1995-11-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313526, H01J 4014

Patent

active

054669243

ABSTRACT:
A proximity-type image intensifier tube has an entrance screen which includes a photocathode which is substantially insensitive to light of wavelengths above 500 nm, and an exit screen having a phosphor layer having a substantial emissivity of notably red light having a wavelength of at least 550 nm. Consequently, optical radiation produced by the exit screen does not produce disturbing feedback radiation from the photocathode. This avoids the need for a reflecting metallic layer on the phosphor layer, as has heretofore been required in order to prevent feedback radiation.

REFERENCES:
patent: 2681420 (1954-06-01), Teves et al.
patent: 3370172 (1968-02-01), Hora
patent: 3569763 (1971-03-01), Kiuchi
patent: 4140900 (1979-02-01), Wang
patent: 4725724 (1988-02-01), Van Der Velden
patent: 4752681 (1988-06-01), Anno et al.
patent: 5025144 (1971-06-01), Odom et al.
patent: 5138147 (1992-08-01), Van Aller et al.

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