Glass bulb for a color cathode ray tube, and color cathode ray tube
US6815882B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2002 |
| Grant date | Nov 9, 2004 |
| Priority date | — |
| Expiry date | May 31, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/861
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A glass bulb for a color cathode ray tube, which comprises a panel, a funnel connected to the panel and a neck, the panel comprising a face portion and a skirt portion constituting a side wall of the face portion and having a seal edge portion at the end portion, wherein such a compressive stress &sgr;c that 50 MPa≦|&sgr;c|≦250 MPa is produced by an ion-exchange method to at least one of short axis end portions and long axis end portions on the outer surface of the face portion; the average thickness t=(tc+tmax)/2 of the face portion represented by the central thickness tc of the face portion and the maximum thickness tmax of the face portion, and the thickness tse at the seal edge portion, satisfy the relation t/tse≦1.4; and the maximum value &sgr;VTmax of the tensile stress generated at the face portion when vacuumized is 20 MPa≦&sgr;VTmax<200 MPa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.