Cathode ray tube with stress-relieved slot-aperture shadow mask
US4131822A · kind A · utility
4Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 20, 1977 |
| Grant date | Dec 26, 1978 |
| Priority date | — |
| Expiry date | May 20, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A shadow mask electrode for a line screen cathode ray tube comprises a formed metal sheet having an array of slot-like apertures therein. The apertures are disposed in parallel rows with the apertures elongated in the direction of the rows and separated from adjacent apertures in the same row by webs. An array of discrete surface cavities are provided as holes etched part way through the thickness of the mask. Each cavity is smaller than an aperture of the mask, is laterally spaced from the center-line of an aperture row opposite a web, and extends slightly into the web.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.