Patent ID: 8018156
Filing Date: 2011-09-13
Classification: H01J

Abstract:
1. A high-pressure discharge lamp having a ceramic discharge vessel, in which two electrodes and a light-producing filling are contained, capillaries resting at the ends of the discharge vessel, in which capillaries leadthroughs are sealed off, which leadthroughs are each connected to an electrode made from tungsten, rhenium or a mixture or alloy of the two elements, possibly with an addition of conventional dopings, wherein the electrode is in the form of a pin and integrally comprises two parts with different diameters, the first part with a first given diameter forming the electrode tip, and the second part with a second given_diameter resting in the capillary, the second diameter of the second part making up at least 108% of the diameter of the first part, the total length of the electrode thus being split between the first part with its first_part length and the second part with its second part length, with the second part's part length making up approximately 30 to 70% of the total length of the electrode, and the beginning of the second_diameter coinciding with the beginning of the capillary or deviating from this by a maximum of 10% of the total length, wherein the second diameter makes up at most 160% of the first diameter.