Electron gun for cathode-ray tube
US4271374A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1979 |
| Grant date | Jun 2, 1981 |
| Priority date | — |
| Expiry date | Sep 12, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/488
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an electron gun for a cathode-ray tube of the type wherein a cathode, control grid electrode, an accelerating electrode and first and second cylindrical electrodes are disposed in the order named and supported and electrically insulated from each other by electrically insulating rods within a neck portion of an envelope, whereby a main electron lens is formed between said first and second cylindrical electrodes, the second cylindrical electrode comprises an enlarged diameter portion and a reduced diameter end portion which is closer to the cathode and is supported by one end of each of the supporting rods; and the first cylindrical electrode has (1) a neck portion which is extended through the reduced diameter end portion of the second cylindrical electrode coaxially thereof and radially inwardly spaced apart therefrom, and (2) an enlarged diameter front portion which has the diameter greater than that of said neck portion, is extended coaxially therefrom into said enlarged diameter portion of said second cylindrical electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.