High pressure sodium vapor lamp stabilized for pulse operation
US4052636A · kind A · utility
10Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1976 |
| Grant date | Oct 4, 1977 |
| Priority date | — |
| Expiry date | Aug 2, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
High pressure sodium vapor lamps operated on sonic frequency pulses with short duty cycle in order to raise the color temperature are subject to arc instability near the electrodes and to overheating of the end closures, particularly that at the anode end when unidirectional pulsing is used. Stability and long life is achieved and overheating is prevented by using electrodes of cross-sectional area from 0.3 to 0.4 times the envelope cross section and lengthening the distance from closure to electrode tip so that the arc gap is less than 80% of the gas column length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.