Patent ID: 7946899

Claim:
A method of manufacturing a high-pressure mercury vapor discharge lamp, comprising the following process steps: manufacturing an envelope from a tube of high temperature resistant material, said envelope having a discharge vessel and two tube sections remaining at opposite sides of the discharge vessel, inserting electrodes into said two tube sections, which electrodes are each connected via a respective metal strip section to a supply line, such that the electrodes extend into the discharge vessel and the electrode gap is smaller than or equal to 2.5 mm, providing the discharge vessel with a filling which essentially comprises substances selected from the group consisting of: rare gas, oxygen, halogen consisting of chlorine, bromine, iodine, or a mixture thereof, as well as mercury in a quantity greater than or equal to 0.15 mg/mm 3 , sealing the discharge vessel by compressing or fusing the tube sections into seal portions, into which the metal strip sections are tightly embedded, wherein the discharge vessel is formed such and the tube sections at the discharge vessel are pressed or fused into the seal portions such that the seal portions have a cross-sectional surface area of between 6 mm 2 and 20 mm 2 and the tube is compressed in axial direction by more than 250% in the location of greatest thickness of the discharge vessel causing a simultaneous radial expansion.