Electron gun structure for a pickup tube
US4201933A · kind A · utility
1Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 1978 |
| Grant date | May 6, 1980 |
| Priority date | — |
| Expiry date | May 22, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron gun structure for a pickup tube comprises a cathode lens electrode assembly, a beam disc electrode and a main lens electrode assembly. The main lens electrode assembly includes first and second electrodes adapted to be supplied with different potentials so as to form a bipotential electron lens in the main lens electrode assembly. The beam disc electrode which has a beam limiting hole is adapted to be supplied with a potential not higher than about 2.5 times the lower one of the potentials to be supplied to the first and second electrodes in the main lens electrode assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.