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

1975-09-29

1977-05-24

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358211, 250213VT, H04N 519

Patent

active

040259552

ABSTRACT:
A low light level image pick-up tube is protected from excessive illumination intensity damage by controlling very high voltage generating means supplying the tube. The tube comprises in a preferred embodiment two image intensifier stages in cascade preceding an electron gun from which a video signal is provided by electronic scanning.
A mean level video measuring circuit provides from the video signal a control signal used to produce on the one hand, a video regulation by varying the amplitude of a supply DC voltage provided to the second image intensifier stage, i.e. that preceding the electron gun, and on the other hand, a diaphragm effect by varying the amplitude and duration of a supply voltage provided by a VHV switched supply circuit to the input image intensifier stage. Further, the switched supply is controlled to cancel out instantaneously the gain of the input intensifier stage so as to protect the camera against sudden and too intensive illumination.

REFERENCES:
patent: 3206547 (1965-09-01), Leitich et al.
patent: 3748383 (1973-07-01), Grossman
patent: 3816744 (1974-06-01), Chow
patent: 3848085 (1974-11-01), Van Atta
patent: 3848123 (1974-11-01), Parker et al.
patent: 3903451 (1975-09-01), Hall et al.

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