Cathode ray tube with shadow mask frame
US6724138B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2002 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | May 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0722
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a color cathode ray including a pair of long frames, a pair of opposing short frames that are fixed to the pair of long frames and support the long frames, and a shadow mask fixed to the pair of long frames in a state applied with a tensile force. The short frames have substantially-triangular bent parts formed to protrude toward the shadow mask. Since such a cathode ray tube can decrease an internal moment of the shadow mask structure, the displacement of the shadow mask in a direction to recede from the phosphor screen surface of the color cathode ray tube can be suppressed and the q-value deviation also can be suppressed even if the shadow mask is expanded by heat generated by an impact of electron beams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.