Starting arrangement for high pressure discharge sodium lamp
US4191910A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1978 |
| Grant date | Mar 4, 1980 |
| Priority date | — |
| Expiry date | Oct 3, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J7/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
High-pressure-discharge (HID) sodium lamp has a starting aid comprising a plug-like ceramic member extending through the longitudinal wall of the arc tube proximate one of the lamp electrodes. The plug-like ceramic member is fused to the alumina arc tube and is electrically conductive by virtue of having embedded therein a small percentage of finely divided refractory metal. At least during lamp starting, the plug-like ceramic starting aid is electrically connected through a resistor to the opposite lamp electrode and, as a result, on application of energizing potential, a glow discharge is established between the interior surface of the plug-like ceramic member and the proximate lamp electrode to ionize the atmosphere within the arc tube to facilitate lamp starting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.