High pressure sodium lamp containing barium getter
US4333032A · kind A · utility
7Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1978 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | Sep 25, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A high pressure sodium lamp comprises an elongated arc tube within an evacuated outer jacket, the arc tube containing a fill including sodium and mercury. A barium getter film is disposed on the inner jacket wall at one end thereof. The film is longitudinally spaced more than 1 cm away from the end of the arc tube in order to reduce photoelectron emission from the barium which can cause sodium migration from the arc tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.