Patent ID: 6437508
Filing Date: 2002-08-20
Classification: H01J,Y02E

Abstract:
A short-arc discharge lamp comprising:a light-emitting tube having at least 15 mg/cc of mercury sealed therein; an anode disposed in said light-emitting tube; a cathode disposed in said light-emitting tube, said cathode being positioned facing said anode; and a heat-release layer covering a substantial portion of an outer surface of said cathode, said heat-release layer being made of tungsten; wherein when said short-arc discharge lamp is provided with electricity having a current value of at least 50 A, an inter-electrode power value defined by a ratio Y/X is at least 500 W/mm, X being defined as a distance in millimeters between said anode and said cathode, and Y being defined as an input power in Watts provided to said short-arc discharge lamp.