Focusing electrode structure
US5994827A · kind A · utility
4Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Oct 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/503
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A focusing electrode in an electron gun for a color cathode ray tube or high definition industrial picture tube includes a first and second focusing electrodes. A recess portion in one end of the first focusing electrode is oriented to face burring parts of the second focusing electrode. An electron beam and a surrounding portion pass through holes in the first focusing electrode to reduce the space between the first and second focusing electrodes. This improves the static convergence drift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.