Cathode ray tube having multilayer interference filter
US5068568A · kind A · utility
12Cited by
4References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 1990 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | May 15, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube, such as a projection cathode ray tube, having a multilayer interference filter disposed between the cathodoluminescent screen and the interior side of the faceplate, the interference filter comprising alternate layers having high (H) and low (L) refractive indices, the high refractive index material being niobium pentoxide and the low refractive index material being either silicon oxide or magnesium fluoride. These filters are substantially free from the crazing which occurs in known filters when subjected to the normal thermal processing of cathode ray tubes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.