Micropoint cathode electron source with a focusing electrode
US5581146A · kind A · utility
11Cited by
8References
9Claims
0Family size
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Key dates
| Filing date | Jun 2, 1995 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Jun 2, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J3/022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Electron source made notably in the form of a micropoint cathode electrode in which a microcathode is located in a cavity (CA) of a dielectric (3). A first gate electrode (VG1) surrounds the cavity (CA) and a second gate electrode (VG2) surrounds the first gate electrode (VG1). The different electrodes are carried to potentials such that the first gate electrode (VG1) acts as an extraction electrode and the second gate electrode acts as a focusing electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.