Glass funnel having arch-like ridge portions and cathode ray tube using same
US6577055B1 · kind B1 · utility
4Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2000 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Jan 19, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2231/1255
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A glass funnel for a cathode ray tube capable of increasing the rigidity of a body portion having a rectangular-shaped open end portion and reducing the weight of the glass funnel wherein on at least a long side of the body portion, arched face portions are formed so as to be substantially perpendicular to an open end face of the body portion and an arch-like ridge portion in each of the arched face portions is extended to portions in the vicinity of the open end portion, whereby stresses generated in the body portion can be transmitted to the corner portions of high rigidity of the open end portion along the ridge portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.