An electron source of the field emission type
US5070282A · kind A · utility
98Cited by
7References
9Claims
0Family size
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Key dates
| Filing date | Dec 18, 1989 |
| Grant date | Dec 3, 1991 |
| Priority date | — |
| Expiry date | Dec 18, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2201/319
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron source is formed by at least one elementary electron emitter in which an emissive point having a very small radius of curvature operates on the field emission principle and produces an electron beam, the intensity of which is independent of any possible variations of electron emission. The emissive point cooperates with an extracting electrode, and a control electrode having a negative potential with respect to the extracting electrode is placed downstream of the extracting electrode with respect to the direction of propagation of the beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.