Electron gun for cathode ray tube
US6614159B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 2002 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Apr 12, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/503
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube has a three-gun type electron gun. The electron gun includes a cathode, a G1 electrode, a G2 electrode aligned in line in this order, the G1 electrode and the G2 electrode having beam-passing holes formed therein. A supporting member supports the cathode in position. A GM electrode is added between the G1 and G2 electrodes and has a beam-passing hole smaller than the holes formed in the G1 electrode and the G2 electrode. The supporting member and the G1 electrode are formed with measurement holes. The G2 electrode may also be formed with a measurement hole therein. A measurement element is inserted through the measurement holes to measure a distance between the G1 electrode and the G2 electrode, and a distance between the GM electrode and the G2 electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.