Cathode-ray tube
US6160344A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1998 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | Apr 10, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/862
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A faceplate panel for a cathode ray tube includes an exterior surface having a substantially flat shape, and an interior surface having a concave shape. The interior surface curves in a direction toward the flat exterior surface with a curvature radius R.sub.p satisfying the following condition: EQU 1.2R.ltoreq.R.sub.p .ltoreq.8R, where R=1.767.times.the diagonal length of the effective screen of the panel. Furthermore, a peripheral thickness t of the faceplate panel at the diagonal end of the effective screen satisfies the following condition: EQU B.ltoreq.t.ltoreq.A, where B is the peripheral thickness of the panel at the diagonal end of the effective screen when a curvature radius R.sub.p of the interior surface is 8R, and A is the peripheral thickness of the panel on the diagonal end of the effective screen when a ratio of the light transmission at the peripheral portion of the diagonal end of the effective screen to the light transmission at the central portion of the effective screen is 0.85.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.