Electric lamp provided with an interference filter
AssigneeU.S. Philips Corporation
InventorGijsbert Kuus
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Abstract
The electric lamp according to the invention has a lamp vessel (1) of glass having an SiO.sub.2 content of at least 95% by weight, in which an electric element (3) is arranged. The lamp vessel is coated with an interference filter (5) of alternating layers of SiO.sub.2 and Nb.sub.2 O.sub.5.
Claims2
An electric lamp provided with a glass lamp vessel sealed in a vacuum-tight manner and having an SiO.sub.2 content of at least 95% by weight, current supply conductors extending through the wall of the lamp vessel to an electric element arranged in the lamp vessel and an interference filter of alternating layers consisting essentially of SiO.sub.2 and consisting essentially of niobium oxide provided on the glass lamp vessel.
Dependencies are inferred from the claim text.