Image intensifier tube gating circuit

Details Image intensifier tube gating circuit Image intensifier tube gating circuit

1975-05-30

1976-10-05

Mullins, James B.

Electric lamp and discharge devices: systems

Time-controlled

250213A, 250213VT, H01J 3150

Patent

active

039847284

ABSTRACT:
A gating circuit for use with an image intensifier tube which allows the e to be turned on and off without producing residual image distortions, and when the tube is off eliminates scintillations on the image screen. The gating circuit provides for direct voltage control with the voltage across the cathode, anode, and the focusing electrodes of the image intensifier tube. The circuit includes a pair of triode vacuum tubes coupled together by a voltage divider network with an RC timing circuit controlling one tube which in turn acts as the bias and control of the other tube for turning the device on and off. The gating circuit is especially useful when utilizing an image intensifier tube in conjunction with photographic film which is time exposed to reproduce an image on the intensifier tube such that switching the tube on and off will not cause deleterious defocusing effects resulting in distortions on the photographic film. When the tube is off, scintillations which would reduce the quality of any photograph of the image will not be present because no voltage exists across the tube cathode and anode.

REFERENCES:
patent: 3350600 (1967-10-01), Hannan
patent: 3619622 (1971-11-01), Pfeiffer et al.
patent: 3689770 (1972-09-01), Dion
patent: 3864595 (1975-02-01), Lawrence et al.
patent: 3903451 (1975-09-01), Hall et al.

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