Electron gun for color-picture tube
US5034652A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1989 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | Mar 16, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/4872
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron gun for a color-picture tube includes adjacent low and high potential electrodes composing an electron lens, which electrodes have electron beam path holes horizonally formed with electric-field correcting members or raised portions. According to this construction, vertical equipotential lines are projected into the electrode so that the low potential electrode adds to electron beams a vertical focusing effect more strongly than a horizontal one and the high potential electrode adds to electron beams a vertical divergent effect more strongly than a horizontal one. The section of the electron beam in a deflection region has an ellipse shape whose major axis extends horizontally, resulting in suppressing a halo portion on the screen. The electron beam is properly focused horizontally and vertically so that the electron beam spot has a circular shape on the center of a screen. It results in improving the resolution on the periphery of the screen without having to lower the resolution on the center of the screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.