Extended temperature range fluorescent lamp
US6479931B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1996 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Jan 16, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/72
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An extended temperature operating range low pressure discharge lamp (10) including: an envelope (12) containing an ionizable medium (20) at a selected pressure; an electrode (16, 18) sealed at each end of the envelope (12) for sustaining an electric discharge through the ionizable medium; and a volume variation control for varying the volume of the ionizable medium (20) in response in variations in temperature within the envelope, wherein the volume variation control includes at least one control volume (of gaseous pressure 40) containing a specified volume of the ionizable medium and an aperture (34) communicating between the envelope (12) and the at least one control volume, wherein the at least one control volume includes a sliding piston (36) for varying the volume of the ionizable medium (20) within the envelope (12).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.