High temperature lamps having UV absorbing quartz envelope
US5196759A · kind A · utility
32Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1992 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Feb 28, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Fused quartz containing both titanium dioxide and cerium oxide as UV absorbing dopants has been found to be particularly effective for lamp envelopes for high temperature lamps such as halogen-incandescent lamps and metal halide arc discharge lamps which emit both UV and visible light radiation. The codoped quartz transmits visible radiation and absorbs a substantial portion of the emitted UV radiation. The UV absorption is far superior at temperatures above 500.degree. C. and the codoped quartz does not react with the fill within.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.