Shadow mask for a colored image tube and image tube comprising the same
US4678963A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1984 |
| Grant date | Jul 7, 1987 |
| Priority date | — |
| Expiry date | Nov 21, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0722
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In colored image tube having a perforated mask for the selection of colors in order that an electron beam intended for one color only reaches on the screen the luminescent material of that color. This mask presents an edge fixed to a frame through the intermediary of bimetallic strips. This frame is integral with the internal face of the glass wall of the tube adjacent to the screen. The bimetallic strips between the edge of the mask and the frame are flat. When the edge of the mask is inside the frame, one of the ends of each strip is welded to an internal projection of the frame and the other end to the edge of the mask in order to provide a space between the corresponding arm of the frame and the edge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.