Patent ID: 8212479

Claim:
A high-pressure discharge lamp having a discharge vessel with a central part that bulges out and which defines a lamp axis with a sealing part being attached to each end of the discharge vessel, with the shaft of in each case one electrode, comprising a head and a shaft, being sealed in the sealing part, and with a capillary tube for supporting the electrode by closely surrounding the shaft of the electrode between the central part of the discharge vessel and the sealing part, wherein a tubular neck is integrally formed as a component of the discharge vessel at the each end of the discharge vessel between the central part and the capillary tube, and is separated from the shaft, wherein the lamp is a direct-current lamp, having a cathode and an anode as electrodes, the cathode being smaller than the anode, and wherein the external diameter of the tubular neck associated with the anode is approximately 1.2 to 1.6 times as large as the external diameter of the tubular neck associated with the cathode.