| 摘要 |
An arc tube (10) having electrodes (20, 22) sealed therein at opposite ends includes a discharge bulb (12) and electrode feedthroughs. The arc tube (10) encloses a fill material containing sodium or a sodium compound. Sodium migration through the arc tube (10) is suppressed by electrically interconnecting a first region of the arc tube (10) and a second region of the arc tube (10). The first and second regions extend from about the middle of the electrode feedthrough to the tip of the electrode (20, 22). In a preferred embodiment, a conductive strap (36, 38) is electrically attached to each electrode feedthrough adjacent to the end well of the discharge bulb (12) and the straps (36, 38) are connected together by an insulated shorting wire (40). |
