Electron beam emitter with increased electron transmission efficiency
AssigneeHitachi Zosen Corporation
InventorKaveh Bakhtari
Life of this patent
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Abstract
An electron beam emitter comprises an electron emission source capable of emitting electrons; a vacuum chamber containing the electron emission source; and a transmission window that keeps airtightness of the vacuum chamber and is capable of transmitting the electrons from the electron emission source. The transmission window includes a foil that transmits the electrons and a grid that does not transmit the electrons. The electron emission source includes an emission portion that emits the electrons and a non-emission portion that does not emit the electrons. The emission portion has a lower work function than the non-emission portion. The non-emission portion is prepared so as to prevent the electrons from reaching the grid.
Claims11
An electron beam emitter comprising:
- an electron emission source capable of emitting electrons;
- a vacuum chamber containing the electron emission source;
- and
- a transmission window that keeps airtightness of the vacuum chamber and is capable of transmitting the electrons from the electron emission source,
- the transmission window including a transmission portion that transmits the electrons and a non-transmission portion that does not transmit the electrons,
- the electron emission source including an emission portion that emits the electrons and a non-emission portion that does not emit the electrons,
- the emission portion having a lower work function than the non-emission portion,
- the non-emission portion being created so as to prevent the electrons from reaching the non-transmission portion.
Dependencies are inferred from the claim text.