Electric lamp and discharge devices – With gas or vapor – Having electrode lead-in or electrode support sealed to...
Patent
1992-10-01
1994-10-04
Yusko, Donald J.
Electric lamp and discharge devices
With gas or vapor
Having electrode lead-in or electrode support sealed to...
313625, 313624, H01J 6136, H01J 932, H01J 6182
Patent
active
053529529
ABSTRACT:
To permit operation of a high-pressure discharge lamp having a metal halide ill at temperatures higher than those acceptable by quartz glass bulbs, the discharge vessel is made of transparent ceramic, thus providing, in operation, better color rendition and higher light output. To eliminate the corrosive effects of attack by the halides on a lead-through connection, the lead-through is made of a solid rod, pin or wire of, preferably, niobium of between 0.5 to 1 mm diameter, passing through a sintered plug (10), in which the niobium lead-through is recessed into the bore from the plug, and the electrode shaft (12) is connected to the lead-through within the recess. The walls of the plugs surrounding the recess thus protect the niobium against corrosive attack, while maintaining the seal throughout its length. Thus, niobium which has a temperature coefficient of expansion close to that of the ceramic can be used. If a glass melt is also used, it is placed at the outer circumference of the plug where the operating temperature is sufficiently low so that the halides in the fill will not degrade the glass melt. To prevent evaporation of niobium during the sintering process, a protective sleeve, for example of ceramic, can be placed over the lead-through at portions where niobium might evaporate from the rod, pin or wire, and also then strengthening the niobium, which has a tendency to become brittle at sintering temperatures.
REFERENCES:
patent: 3363133 (1968-01-01), Harris et al.
patent: 4545799 (1985-10-01), Rhodes et al.
patent: 4959588 (1990-09-01), Vida et al.
Patel N. D.
Patent-Treuhand-Gesellschaft F. Elektrische Gluehlampen mbH
Yusko Donald J.
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