High-pressure, high-power discharge lamp, and method of its manufacture
US5264759A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1991 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Sep 26, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/368
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To provide a high-pressure lamp capable of carrying lamp currents of 100 eres and higher, an essentially rotation-symmetrical discharge space (2) has two cylindrical necks (3, 4) melt-sealed thereto. Each one of the necks is formed of at least two telescoped hollow cylindrical quartz glass tubes (19, 27) which, with sealing foils circumferentially located within the neck, are all gas-tightly melt-sealed together. The sealing foils, typically of molybdenum, are electrically connected to a molybdenum disk (7, 8), for example by being welded to the circumference thereof which, in turn, is soldered to an end portion of an electrode shaft (5, 6), typically of tungsten, which extends into the discharge space of the discharge vessel. During manufacture, the inner quartz glass tube (27) is formed with a ring-shaped expansion or distention (23) which is melt-sealed to the inner wall of the outer glass tube (19), to permit flushing of the space between the glass tubes and where the sealing foils are located, for example flushing with argon, and subsequent melt-sealing with a vacuum of 20 mbar argon, while introducing 1 bar air pressure into the interior of the inner tube. After the neck stru…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.