Patent ID: 6940217

Claim:
Short-arc, ultra-high pressure discharge lamp which comprises: a light emitting part in which there are a pair of opposed electrodes and in which an inner volume of the light emitting part is filled with at least 0.15 mg/mm 3 of mercury; and side tube parts which extend from opposite sides of the light emitting part and in which the electrodes are partially hermetically sealed and in which the electrodes are each welded to a metal foil, wherein, in areas in which the electrodes have upholding parts that are welded to the metal foils, the upholding parts of the electrodes are deformed in a direction perpendicular to the metal foils and wherein a degree of deformation D 2 /D of the upholding parts of the electrodes is at most 10%, where D is the undeformed height of the upholding parts in said direction perpendicular to the metal foils and D 2 is an extent to which the undeformed height has been reduced by the electrodes having been deformed.