Structure of electron source and application thereof to electromagnetic wave emitting tubes
US4999537A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1989 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Jul 3, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J23/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The electron source disclosed comprises a solid having a first semiconductor layer capable of releasing electrons under the effect of an electrical field, means to make at least one of its faces partially transparent to at least one part of the released electrons, and to enable this part of the electrons to be ejected from the solid, and a second unstable composite semiconductor layer having a structure having a negative differential resistance located between the first layer and its face which is at least partially transparent, in contact with the first layer. The electron source further includes means to form, with said first layer and the composite layer, an electrical resonant cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.