Shadow mask having a layer of high atomic number material on gun side
US4339687A · kind A · utility
6Cited by
3References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 29, 1980 |
| Grant date | Jul 13, 1982 |
| Priority date | — |
| Expiry date | May 29, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0777
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube of the shadow mask type has a layer of high atomic number material fabricated upon the shadow mask surface nearest to at least one electron gun, to increase backscatter of electrons impinging upon the non-aperture areas of the shadow mask, thereby reducing local heating of the mask and maintaining color purity of the cathode ray tube even at increased brightness levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.