Color cathode ray tube having a small neck diameter
US5710480A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1995 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Dec 28, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/4841
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A color cathode ray tube has an evacuated envelope including a panel portion having a phosphor screen and a neck portion, and an in-line electron gun including a main lens and an electrostatic quadrupole lens and housed in the neck portion. The focus electrode of the main lens has a single opening at its one end for the three electron beams. The single opening has a diameter larger in a horizontal direction than that in a vertical direction. A distance from the main lens to the phosphor screen is not larger than 300 mm, an outer diameter T of the neck portion satisfies the following inequality: 23.2 mm.ltoreq.T.ltoreq.25.9 mm, and a value D of twice a distance from the side electron beams to a vertical edge of the single opening satisfies the following inequality: 5.0 mm.ltoreq.D.ltoreq.6.5 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.