Double-ended high-pressure discharge lamp

摘要

To permit high lamp currents to be applied to lamp electrodes (5, 6) of a discharge vessel (2) from which two elongated necks (3, 4) extend via current supply leads (23, 35), the discharge vessel is first made as a generally rotation-symmetrical element, to which tubular cylindrical neck tubes (17) are sealed. A cylindrical plug element (26, 40) is placed in the neck tube adjacent the discharge vessel. A subassembly is then made of a core element, which can be constructed as a single or a composite structure of quartz glass, for example by telescopically fitting quartz glass tubes over a central core, and melt-sealing the tubes and core together. Molybdenum disks (7, 8; 22) are placed against the end faces of the core element, and a plurality, for example four, molybdenum connecting foils (11-16, 27) are secured to the circumferences of the disks, to axially connect them together. The subassembly is then introduced into the neck tube through the plug element, a further quartz glass tube is placed over the current supply lead (23) and formed with a bulbous enlargement, which is sealed to the interior of the neck portion. The basic lamp structure is now complete. neck portion, with the core element and foil-connected disks therein is then flushed. After flushing, the disks, foils, and core element are all melt-sealed together within the neck tube and the bulbous portion of the quartz tube, together with the remaining portion of the neck tube, is severed.