High-pressure, high-power discharge lamp, and method of its manu

Details High-pressure, high-power discharge lamp, and method of its manu High-pressure, high-power discharge lamp, and method of its manu

1991-09-26

1993-11-23

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Having electrode lead-in or electrode support sealed to...

313 43, 313 44, 313634, H01J 1718

Patent

active

052647595

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 structure is gas-tightly sealed together, the enlargement or distention together with an adjacent portion of the neck structure, is severed.

REFERENCES:
patent: 3675068 (1972-07-01), Strauss
patent: 4647814 (1987-03-01), Dobrusskin et al.
patent: 4959587 (1990-09-01), Schug
Soviet Inventions Illustrated, SU 1092-608-A, Feb. 1985.

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