Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1989-11-22
1991-12-24
Yusko, Donald J.
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313633, 313634, 313636, 313639, 445 26, 445 40, 445 43, H01J 1716, H01J 6130, H01J 926, H01J 938
Patent
active
050755870
ABSTRACT:
A high-pressure metal vapor discharge lamp, for example and specifically a etal halide vapor discharge lamp, has a discharge vessel, in which electrodes are fitted from both ends, in form of an elongated ceramic hollow body, in which, in accordance with the invention, the ceramic is translucent, high-purity aluminum nitride (AIN). The end portions are closed off by closing electrodes in form of either solid pins or rods, from which electrode elements carried on shafts (13) extend, or a hollow tube (19) fitted into the end portion of the aluminum nitride discharge vessel and pinched and soldered shut. The solid or tubular closing elements can be inserted into a pre-sintered discharge vessel, preferably under inert atmospheric conditions, in a meticulously clean environment. For translucidness, the high-purity aluminum nitride should have less than 0.05% of metal cations, which may cause coloring or discoloration, less than 0.01% iron as two or three valent ions, and less than 0.01% of silicon or tungsten carbide (all percentages by weight), but may contain dopings between 0.01% and 5% of oxides or fluorides of the metals yttrium, calcium, neodymium, lanthenum and/or aluminum.
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Brunner Dieter
Juengst Stefan
Pabst Wolfgang
Gilist John E.
Patent Treuhand Gesellschaft fur elektrische Gluhlampen mbH
Yusko Donald J.
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