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US 5,463,271 AGranted
Structure for enhancing electron emission from carbon-containing cathode
AssigneesSilicon Video Corporation, Massachusetts Institute of Technology
InventorsMichael W. Geis, John M. Macaulay, Jonathan C. Twichell
Life of this patent
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Abstract
A cathode structure contains electronegative atoms (22), which consist of oxygen and/or fluorine, chemically bonded to a carbon-containing cathode (10). Atoms (24R) of electropositive metal are chemically bonded to the electronegative atoms. The combination of the electropositive metal atoms and the electronegative atoms enhances the electron emissivity by reducing the work function.
Claims24
An emissive cathode structure comprising:
- at least one carbon-containing electron-emissive cathode;
- electronegative atoms chemically bonded to the cathode where the electronegative atoms comprise at least one of oxygen and fluorine;
- and
- atoms of electropositive metal chemically bonded to the electronegative atoms.
1 more element
An emissive cathode structure comprising:
- at least one carbon-containing cathode having an electron-emissive surface, the cathode being at least 50 atomic percent carbon along the electron-emissive surface;
- electronegative atoms chemically bonded to the cathode along a specified area of the electron-emissive surface, the electronegative atoms comprising at least one of oxygen and fluorine;
- and
- atoms of electropositive metal chemically bonded to the electronegative atoms along the specified area.
1 more element
Dependencies are inferred from the claim text.