Patent ID: 8922122

Claim:
An electron emission element, comprising: an electron emitter including an electron emission region disposed between a gate electrode and a cathode electrode; an anode including a conductive ring enclosing a central region, wherein the anode is disposed above the electron emission region such that electrons generated from the electron emission region are directed through the central region of the anode; and a voltage set including a conductive loop enclosing a central region, wherein the voltage set is disposed above the anode such that the generated electrons are directed towards the central region of the voltage set, wherein a first voltage applied between the gate electrode and the cathode electrode controls a quantity of the electrons generated from the electron emission region, wherein a second voltage applied to the conductive ring extracts the generated electrons, wherein a third voltage applied to the conductive loop controls a direction of the electrons extracted through the anode, and wherein the first voltage ranges between 10V and 500V.