Cathode ray tube apparatus
US4591760A · kind A · utility
4Cited by
4References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Mar 21, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/485
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron gun has five grids (G.sub.1, G.sub.2, G.sub.3, G.sub.4, G.sub.5), and an additional grid (G.sub.2s) is disposed between the second grid and the third grid (G.sub.3) and is impressed with a potential lower than that of the second grid (G.sub.2), and a trimming electrode (G.sub.5a) with a trimming aperture 14 is provided in the fifth grid (G.sub.5), and by trimming the outer shell part of the electron beam having crossed the electron gun axis twice a very small beam spot is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.