Streaking or framing image tube with plural grid control

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit

Patent

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313529, H01J 3150

Patent

active

049260391

ABSTRACT:
A streaking or framing image tube includes a photocathode (4), three grid electrodes (1, 2 and 3), a focus electrode (5) and an anode (6) disposed successively along the image tube. The tube is gated by applying a positive voltage pulse first to the second grid electrode (2) and then to the photocathode (4), the delay time between the application of the pulse to the second grid and the photocathode being the gated "on" time of the image tube, while during the application of the pulse to the second grid electrode (2) and the photocathode (4), the potentials of the first and third grid electrodes (1, 3) are held constant at a constant value, and accordingly ultra high speed gating (e.g. allowing the passage of electrons for less than 10.sup.-9 seconds) can be achieved without effect on the magnification or resolution performance of the image tube.

REFERENCES:
patent: 3733493 (1973-05-01), Hagar
patent: 4323811 (1982-04-01), Garfield
patent: 4740685 (1988-04-01), Koishi
patent: 4801796 (1989-01-01), Kinoshita et al.

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