Surface-emission cathodes having cantilevered electrodes

Details Surface-emission cathodes having cantilevered electrodes Surface-emission cathodes having cantilevered electrodes

2005-09-28

2008-10-28

Prenty, Mark (Department: 2822)

Electric lamp and discharge devices

Discharge devices having a thermionic or emissive cathode

C313S326000

Reexamination Certificate

active

07443090

ABSTRACT:
A surface-emission cathode formed on an insulating surface having cantilevered, i.e. “undercut,” electrodes. Suitable insulating surfaces include negative electron affinity (NEA) insulators such as glass or diamond. The cathode can operate in a comprised vacuum (e.g., 10−7Torr) with no bias on the electrodes and low vacuum electric fields (e.g., at least 10 V cm−1). Embodiments of the present invention are inexpensive to fabricate, requiring lithographic resolution of approximately 10 micrometers. These cathodes can be formed over large areas for use in lighting and displays and are suitable for satellite applications, such as cathodes for tethers, thrusters and space-charging neutralizers.

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