Integral-shadow-grid controlled-porosity dispenser cathode
US4371809A · kind A · utility
4Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1980 |
| Grant date | Feb 1, 1983 |
| Priority date | — |
| Expiry date | Jun 19, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a controlled-porosity dispenser cathode of the type which has a foil w a plurality of holes covering the emitting material so that emitting material is dispensed through the holes to the electron-emitting surface of the foil and electrons are actually emitted through the holes and a small area surrounding each hole, a non-emitting shadow grid is laid down on the surface of the foil in such a configuration that it does not obstruct any of the emitting holes, has the same shape as the control grid, and is substantially in precise registration with the control grid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.