Electric lamp with molybdenum contact pins surrounded by non-corrosive metal sleeves
AssigneeU.S. Philips Corporation
InventorAlfons Eugeen Maria Hardies
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Abstract
Electric lamps having a quartz glass lamp envelope frequently have outer current conductors of molybdenum because this metal has a coefficient of expansion which corresponds best to that of quartz glass. Because molybdenum is sensitive to oxidation the current conductors quickly oxidize so that a good electric contact with connection terminals of a current source is no longer possible. According to the invention, the outer current conductors are surrounded by a sleeve of non-corrosive metal and are rigidly connected thereto by a local kink in the current conductor and the sleeve.
Claims4
An electric lamp having a quartz glass lamp envelope with pinched seal, a molybdenum foil being incorporated in the pinch to which foil are connected an inner current conductor and a contact pin which comprises an outer current conductor of molybdenum, a sleeve disposed about part of the outer current conductor projecting beyond the lamp envelope, said sleeve being a corrosion-resistant metal, said current conductor and said sleeve each having a cooperatively dimensioned and configured kink preventing relative movement therebetween.
Dependencies are inferred from the claim text.