Electron gun for color cathode ray tube providing two electron beam cross over points
US5739629A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | May 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/4886
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A double cross-over type electron gun for a color CRT is provided. The electron gun includes a triode having a cathode, a control electrode and a screen electrode, for generating and controlling an electron beam, a plurality of focus electrodes sequentially disposed adjacent to the triode, for forming at least one auxiliary lens, and a final accelerating electrode disposed adjacent to the focus electrode, for forming a main lens. The electron beam generated by the triode includes a cross-over point in front of the main lens and proximate to the auxiliary lens. At least one of the auxiliary lenses disposed upstream from the main lens is formed as a quadrupole lens so that the position of the cross-over point in the horizontal direction and that in the vertical direction are different from each other. When a dynamic focusing voltage is applied, the image quality at the periphery of a screen can be greatly improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.