Method of making a thermionic field emitter cathode
US4734073A · kind A · utility
3Cited by
10References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1986 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Oct 10, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J23/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The face of a cathode surface is machined to provide a spiral surface fin with microscopic sharp symmetrical protrusions. The cathode gives enhanced emission due to field emission generated at the sharp symmetrical protrusions and due to the increased surface area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.