| 摘要 |
An image tube such as an image inverter including a photo cathode, two grid electrodes, a focus electrode and an anode disposed successively along the image tube is gated by means of the application of a switching pulse to the first of the two grid electrodes while the second of the two grid electrodes is maintained at a positive potential less than that to which the first grid electrode is raised. In this manner over-shoot or ripple in the switching pulse does not disturb the electric field conditions beyond the second grid electrode and accordingly high speed gating can be achieved without effect on the magnification or resolution provided by the image tube.
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