Electron gun for convergent beam, and a device, particularly a vidicon tube, equipped with such a gun
US4486687A · kind A · utility
4Cited by
6References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 7, 1981 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | May 7, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/563
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
For reducing as much as possible the dimension of converging electron beams, at their point of minimum section, the invention provides in this zone an ionic charge counterbalancing the space charge of the beam, by means of an equipotential electrode disposed about this point. Said electrode is the tube in the figure. When further modulation is applied to the beam, the electrode which ensures it is placed after it in the path thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.