Apparatus for mounting a field emission cathode
US4687964A · kind A · utility
2Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 9, 1985 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | May 9, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/304
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A field emission cathode 12 is positioned in a pair of intersecting cross grooves 30, 32 in the end of a ceramic tube 14 by a metal end cap 24. A spring 34 in electrical contact with the base of the cathode provides the necessary pressure to maintain continuous circumferential electrical contact between the gate film and a raised edge 38 on the end cap. With this structure the cathode chip is self-centering and easily replaceable. Also the gate film of the cathode is not abraded or rubbed during installation, and the holder is readily degassed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.