Patent ID: 6825614
Filing Date: 2004-11-30
Classification: G03F,H01J

Abstract:
Short-arc discharge lamp operable by direct current, comprising:anode and cathode electrodes located in an emission space; a metal foil electrically connected to the electrodes; a quartz tube part which surrounds the metal foil; a sealing quartz component in contact with an inner side of the metal foil, said sealing quartz component having an insertion opening; a metallic component inserted into the quartz tube part and electrically connected to the metal foil; and a foil sealing area formed by the metal foil, the quartz tube part and the sealing quartz component sealed against one another, wherein an area of the metallic component inserted into the sealing quartz component has a length that is at least equal to 40% of the total length of the sealing quartz component, and wherein the lamp has an electric input power at least equal to 4 kW and an operating pressure during luminous operation at least equal to 2Ã—106 Pa; wherein the metallic component comprises a lead pin having a feed point side and a cathode side, and wherein the diameter of the lead pin on the cathode side is smaller than the diameter on the side of the feed point, said feed point side and said cathode side of said lead pin being positioned within said insertion opening to form a gap between said lead pin and said sealing quartz component within said insertion opening.