Electron emitter source
US10192708B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 19, 2016 |
| Grant date | Jan 29, 2019 |
| Priority date | — |
| Expiry date | Dec 29, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2237/06375
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron emitter that consists of: a low work function material including Lanthanum hexaboride or Iridium Cerium that acts as an emitter, a cylinder base made of high work function material that has a cone shape where the low work function material is embedded in the high work function material but is exposed at end of the cone and the combined structure is heated and biased to a negative voltage relative to an anode, an anode electrode that has positive bias relative to the emitter, and a wehnelt electrode with an aperture where the cylindrical base protrudes through the wehnelt aperture so the end of the cone containing the emissive area is placed between the wehnelt and the anode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.