Color cathode ray tube having a large-diameter lens
US5894190A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1997 |
| Grant date | Apr 13, 1999 |
| Priority date | — |
| Expiry date | Mar 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/488
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube is provided with an electron gun having an electron lens including a large-diameter cylinder electrode and a small-diameter cylinder electrode composed of a large-diameter cylinder portion and a small-diameter cylinder portion, and at least the large-diameter cylinder portion of the small-diameter cylinder electrode is inserted in the large-diameter cylinder electrode thereby forming the electron lens. The small-diameter cylinder portion extending in the tube axis direction of the large-diameter cylinder electrode and connected to the large-diameter cylinder electrode is expanded or bulged, or the bottom portion of the large-diameter cylinder electrode is removed while only the electrode support portion connected to the large-diameter cylinder electrode is left, so that the electrode support fixed to the outer surface of the small-diameter cylinder portion of the small-diameter cylinder electrode can pass therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.