Color cathode ray tube
US6919675B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2003 |
| Grant date | Jul 19, 2005 |
| Priority date | — |
| Expiry date | Jan 9, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/4865
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an electron gun including a cathode, a control electrode, an acceleration electrode G2, a focusing electrode G3 and an anode, longitudinally elongated concave SL-V which surround an electron beam aperture G2-H and have a long axis in the vertical direction is formed at a focusing electrode G3 side of the acceleration electrode G2, and an electron beam aperture G3-BH formed at the acceleration electrode G2 side of the focusing electrode G3 is formed in a longitudinally elongated shape having a long axis in the vertical direction. Due to such a constitution of the present invention, non-uniformity of the beam spot shape attributed to a deflection quantity can be reduced whereby the optimum focusing can be realized over the whole area of a screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.