CPC H01J 1/46 (2013.01) [H01J 1/304 (2013.01); H01J 9/18 (2013.01)] | 21 Claims |
1. A field emission cathode device, comprising:
a rotating field emission cathode including a field emission material deposited on a surface thereof, the field emission cathode rotating about an axis extending therethrough and being electrically connected to ground;
a planar gate electrode extending parallel to a portion of the surface of the rotating field emission cathode and defining a gap therebetween; and
a gate voltage source electrically connected to the gate electrode and arranged to interact therewith to generate an electric field between the gate electrode and the rotating field emission cathode, the electric field inducing the portion of the surface of the rotating field emission cathode adjacent to the gate electrode to emit electrons from the field emission material toward and through the gate electrode.
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