Patent ID: 8188663
Filing Date: 2012-05-29
Classification: H01J

Abstract:
1. A high intensity discharge lamp comprising a discharge vessel having a wall enclosing a discharge space, an ionizable material contained in said space, and at least two electrodes each having an embedded portion and an electrode shaft extending from the wall of the discharge vessel and ending with a tip of the electrode, the electrodes being arranged in said space for establishment of an electric arc between said tips, wherein each of the electrode shafts of the electrodes comprises a thickened portion arranged between the embedded portion and the tip of the electrode, a first shaft section extending between the embedded portion and the thickened portion, the first shaft section having a first length and a first shaft diameter having substantially the same diameter as the embedded portion, and a second shaft section extending between the thickened portion and the tip of the electrode, the second shaft section having a second length and a second shaft diameter, and wherein