Color picture tube having a low expansion tension mask attached to a higher expansion frame
US6225736A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 1, 1999 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Apr 1, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/073
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A color picture tube has a tensioned mask supported by a support frame mounted within the tube. The mask has a significantly lower coefficient of thermal expansion than the frame. The mask has an active apertured portion formed by a plurality of parallel vertically extending strands, through which electron beams pass during operation of the tube, and two opposite side border portions outside the active apertured portion. The two opposite side border portions have tie bars that extend between the vertical strands of the mask. The tie bars accommodate expansion of the frame, while substantially maintaining the positions of the vertical strands in the active portion of the mask.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.