Abstract Method of making an electric gas discharge lamp having an envelope of densely sintered aluminum oxide and employing an alkali metal vapor as the discharge medium. A current lead-in member for an electrode envelope by means of a sealing element of densely sintered aluminum oxide which is sintered to the inner wall of the envelope and is provided with an aperture into which a cylindrical current lead-in supporting at one end an electrode assembly is secured in a gastight manner. The current lead-in member is provided with a cover for the envelope which is sealed to the latter by a sealing glass having a melting point higher than 800*C. and lower than the melting point of the aluminum oxide or the current lead-in member.
The method of claim 1 wherein the introduction of the alkali metal, the connection of the second current supply member and the second cover are carried out in a bell containing an inert atmosphere of the rare gas.
Claim 2
Dependent Claim
52 words
The method of claim 2 wherein the connection of the current supply member is effected by uniting said member, the cover and a given quantity of glass-forming material into one handleable assembly which is placed on the sealing element, the current supply member being threaded through the aperture in the sealing element.
Claim 3
Dependent Claim
25 words
The method of manufacturing an electric gas discharge lamp as in claim 1 wherein the alkali metal is sodium and the rare gas is xenon.