Low light level image pick-up tube arrangement

Details Low light level image pick-up tube arrangement Low light level image pick-up tube arrangement

1974-05-06

1976-08-10

Richardson, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178DIG11, 250213VT, 178DIG29, H04N 534

Patent

active

039743314

ABSTRACT:
A low light level image pick-up tube is protected from excessive illumination intensity damage by controlling a very high voltage assembly supplying the tube. The tube comprises in a preferred embodiment a plurality of image intensifier stages in cascade preceding an electron gun from which a video signal is provided by electronic scanning.
A mean level video regulation circuit provides from the video signal an output signal used for controlling the supply voltage value to at least one of the image intensifier stages including the last one i.e. that preceding the electron gun. Further, a signal proportional to the supply current to the last image intensifier stage is used for controlling the supply voltage value of the input image intensifier stage which receives focussed radiation from an observed field.

REFERENCES:
patent: 3553363 (1971-01-01), Anderson
patent: 3612762 (1971-10-01), Wuellner et al.
patent: 3691302 (1972-09-01), Gaebele et al.
patent: 3694659 (1972-09-01), Ramsay et al.
patent: 3748383 (1973-07-01), Grossman
patent: 3795767 (1974-03-01), Waltner et al.

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