Field emission cathode having an electrically conducting material shaped of a narrow rod or knife edge

a field emission cathode and narrow rod technology, applied in the direction of cold cathodes, liquid electrodes of discharge tubes, electrolyte emitting electrodes/cathodes, etc., can solve the problem that the field emission cathodes of vacuum microelectronics cannot be produced in their optimal geometry, the electric stream declines with the operating time, and the method is impractical, so as to achieve high emission quality and long life
USRE38223E1Inactive Publication Date: 2003-08-19KEESMANN TILL
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
KEESMANN TILL
Publication Date
2003-08-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

A field emission cathode device consisting of an electrically conducting material and with a narrow, rod-shaped geometry or a knife edge, to achieve a high amplification of the electric field strength is characterized in that the electron-emitting part of the field emission cathode at least partly has preferred cylindrical host molecules and / or compounds with host compounds and / or cylindrical atomic networks, possibly with end caps with diameters measuring in the nanometer range.
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Description

The invention relates to a field emission cathode device of an electrically conducting material and with a narrow, rod-shaped geometry or a knife edge to achieve high amplification of the electric field strength, such that the electron-emitting part of the field emission cathode has cylindrical molecules. The invention also relates to a method for producing such a field emission cathode device.Field emission means the emission of electrons from the surface of an electric conductor under the action of an electric field exceeding 10.sub.9 V / m. In practice, such field strengths are realized at sharp edges or tips, where the field strength is amplified. High vacuum is necessary to avoid gas discharges.DESCRIPTION OF THE PRIOR ARTField emission cathodes are used, for example, in field electron microscopes, in electron accelerators, in high-power switches (OS DE 39 24 745 A1) and in field emission diodes and field emitter arrays for vacuum microelectronics (thus for example Busta, Vacuum ...

Claims

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