| 摘要 |
PROBLEM TO BE SOLVED: To provide a high brightness discharge lamp (HID) which includes an electrode suitable for limiting temperature. SOLUTION: The high brightness discharge lamp includes a discharge vessel having a wall 2 enclosing a discharge space, an ionizable material contained in the space, and an electrode having an embedded portion 4 and an electrode shaft 6 extending from the wall of the discharge vessel and ending with a tip 7 of the electrode 3, the electrodes being arranged in the space for establishment of an electric arc between the tips. Each of the electrode shafts of the electrodes includes a thickened portion 20 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, 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. The thickened portion has a minimum distance from the inner wall of at least 50% of the first shaft diameter, the length of the second shaft section is at least 100% of the second shaft diameter, and the first length is at most equal to the second length. COPYRIGHT: (C)2010,JPO&INPIT
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