Fluorescent lamps having improved lamp spectral output and maintenance and method of making same
US4698239A · kind A · utility
2Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1986 |
| Grant date | Oct 6, 1987 |
| Priority date | — |
| Expiry date | Sep 29, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Lumen maintenance and spectral output of fluorescent lamps is improved by applying over the phosphor a vapor deposited film consisting of yttrium oxide and at least one activator. The vapor is generated by electron beam bombardment of the activated yttrium oxide target and the film is most efficacious when applied to a thickness of from about 0.2 microns to about 1.5 microns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.