Image intensifying device

Details Image intensifying device Image intensifying device

1976-08-17

1978-05-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313102, H01J 3150

Patent

active

040876837

ABSTRACT:
An image intensifying device including a light transmissive photocathode layer, a cathode electrode composed of two annular parts, the smaller of which is electrically connected to the photocathode layer, and an annular insulating part between the two electrode parts, and an anode provided with a fluorescent screen receiving electrons from the photoconductive layer, with the electrode parts being connected together by a high value intermediate resistance and the smaller electrode part being connected to the negative pole of a d.c. voltage source via a cathode resistance whose value is selected such that upon incidence on the photocathode layer of long term, high intensity optical radiation which would exceed the capacity of the screen, a high voltage drop appears across the cathode resistance to prevent the energy of the electrons striking the screen from exceeding its capacity, while the capacitances existing between the anode and each annular part protect the screen from damage upon the occurrence of rapid optical radiation intensity increases.

REFERENCES:
patent: 3280356 (1966-10-01), Stoudenheimer et al.
patent: 3708673 (1973-01-01), Blacker
patent: 3916240 (1975-10-01), Cuelenaere et al.

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