Cathode ray tube
US6380668B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1999 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Nov 5, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/8609
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube includes a panel having an inner phosphor screen, and a funnel having a panel sealing side, a cone portion and a neck sealing side. The panel sealing side of the funnel is sealed to the panel at a phosphor screen-side. A deflection yoke is mounted around the cone portion of the funnel. A neck is sealed to the neck sealing side of the funnel and an electron gun is mounted within the neck. The cone portion of the funnel is formed with a sectional shape where a circle gradually changes into a non-circle from a neck-side of the cone portion to a panel-side of the cone portion. The cone portion of the funnel has a thickness in a horizontal axis direction and a thickness in a diagonal axis direction, and the ratio of the diagonal thickness to the horizontal thickness ranges from 1.03 to 1.21.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.