Patent ID: 6960884
Filing Date: 2005-11-01
Classification: H01J,H05B,Y02B

Abstract:
1. A device for operating a short arc discharge lamp, comprising: a short arc discharge lamp having a silica glass arc tube containing a pair of opposed electrodes that are spaced at a distance of at most 2 mm from each other and which is filled with at least 0.15 mg/mm a power supply which supplies the discharge lamp with direct current when operation is starting and afterwards with an alternating current, wherein at least one of the electrodes has a melted part towards the electrode head which has been formed by winding an electrode rod with a coil and by melting a part of the coil which is oriented toward the electrode head at least in a surface area thereof, and which has a coil part which extends from the melt part continuously and integrally with it in a direction away from the electrode head, and wherein the direct current supplied to the discharge lamp is initially 0.3 to 0.6 times as great as the rated current and then is increased to 1.0 to 2.0 times as much as the rated current.