Color cathode ray tube having a small neck diameter
US5942844A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1997 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Oct 14, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/503
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A color cathode ray tube has a phosphor screen and an in-line electron gun. Each of the focus electrode and the anode of has a single opening for passing three electron beams. The single opening has a diameter larger in a horizontal direction than a diameter thereof in a vertical direction. Each of the focus electrode and the anode has a plate electrode placed therein and forming apertures for passing the three electron beams respectively. The focus electrode and the anode forms a main lens therebetween. The distance from the main lens to the phosphor screen is 360 mm or less, the outside diameter T in mm of the neck portion of the evacuated envelope housing the electron gun satisfies 23.5 mm.ltoreq.T.ltoreq.25.3 mm, the value D in mm of twice the distance from the center of a trajectory of a side electron beam to a vertical edge of the single opening in each of the focus electrode and the anode satisfies 6.5 mm<D.ltoreq.8.3 mm, and the center-to-center spacing S in mm between two adjacent electron beams satisfies T-15.5 mm.gtoreq.2S.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.