Low noise sodium vapor lamp for sonic pulse operation
US4061939A · kind A · utility
9Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1976 |
| Grant date | Dec 6, 1977 |
| Priority date | — |
| Expiry date | Aug 2, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/366
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Jacketed high pressure sodium vapor lamps of conventional construction operated on sonic frequency pulses with short duty cycles in order to raise the color temperature produce excessive acoustic noise. The noise level is reduced by using non-magnetostrictive material for the inleads extending from the base into the outer envelope and including the portions embedded in the press of the stem, and for the frame parts that support the arc tube within the outer envelope.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.