Electron gun for cathode ray tube
US6713964B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2003 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Feb 5, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/481
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides an electron gun for a cathode ray tube that forms a main focus lens of a maximum diameter within a neck of a limited diameter to thereby realize high focus performance and resolution characteristics. The electron gun includes a single cathode emitting electrons; first and second grid electrodes forming a triode portion with the cathode; a third grid electrode provided subsequent to the second grid electrode; a fourth grid electrode provided subsequent to the third grid electrode and to which a focus voltage is applied, the fourth grid electrode including an input section positioned opposing the third grid electrode and an output section connected to the input section; a fifth grid electrode mounted surrounding part of the fourth grid electrode with a predetermined gap therebetween and to which an anode voltage is applied; and a connector interconnecting the third grid electrode and the fifth grid electrode, wherein the output section of the fourth grid electrode is exposed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.