High pressure discharge lamp structure

Details High pressure discharge lamp structure High pressure discharge lamp structure

1987-10-14

1988-10-25

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

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

313625, 313626, 313332, H01J 1718, H01J 6136

Patent

active

047806460

ABSTRACT:
To provide an electrode connection lead (8) made of tungsten positioned on he inside of a high-pressure discharge lamp (1,2) which contains a fill attacking niobium, while providing for a melt connection including niobium to the discharge vessel, to permit use of aluminum oxide ceramic for the discharge vessel--since niobium and aluminum oxide ceramic have approximately the same thermal coefficient of expansion--the tubular discharge vessel is formed with an end portion defining an abutment (5), against which an internal aluminum oxide ceramic disk (4) is seated, defining a recess (4a) within which a niobium sealing disk (6) is partly located. An identical external sealing disk (3) receives the remainder of the niobium sealing disk. An external current supply lead (7) of niobium is welded to the niobium sealing disk. The internal current supply lead (8) of tungsten, likewise, is welded to the niobium sealing disk. The internal and external disks (4,3), the sealing disk (6) and the current supply leads are melted-into the aluminum oxide ceramic body by means of a glass melt connection utilizing a melt glass not attacked by fill substances used in metal halide lamps.

REFERENCES:
patent: 3531853 (1970-10-01), Klomp
patent: 3892993 (1975-07-01), Timmermans
patent: 3916242 (1975-10-01), Wright, Jr.
patent: 4160186 (1979-07-01), Kerekes

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