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US 4,001,625 AGranted
High-pressure discharge lamp having a metal lead through conductor
AssigneeU.S. Philips Corporation
InventorsBralt Renze Schat, Abraham Timmermans
Life of this patent
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Abstract
A discharge vessel is closed with the aid of a stud of molybdenum/aluminum-oxide cermet through which an electrical tubular lead-through of molybdenum projects. The cermet stud and the molybdenum tube constitute a gastight connection without the interposition of a melting glass.
Claims4
A discharge lamp which comprises:
- an elongated generally tubular discharge tube formed of a material which is primarily aluminum oxide;
- a pair of disc-shaped closure members disposed at each end of said tube, each of said closure members having a passage-way therethrough and being formed of an aluminum oxide cermet;
- a pair of generally tubular lead-through conductors disposed in axially aligned relationship, each extending through said closure members, said cermet having a coefficient of thermal expansion intermediate the coefficient of thermal expansion of said conductors and said discharge tube, said discharge tube conductors being disposed in sealing engagement directly with said closure member.
Dependencies are inferred from the claim text.