| 摘要 |
An electrodeless HID lamp of the type having an excitation coil disposed about an arc tube for exciting a plasma arc discharge therein includes a light-transmissive outer envelope disposed about the arc tube and a light-reflective coating on the upper portion of the arc tube. Thus, light emitted by the arc discharge radiates in a forward direction through the lower portion of the arc tube. An elongated support for the arc tube is situated within the outer envelope and extends in the forward direction through the corresponding lower end of the outer envelope. According to one embodiment, the arc tube support is tubular and contains therein a discharge starting aid. The lamp further preferably includes a getter disposed within the outer envelope for removing gaseous impurities therefrom. A getter support is attached to the upper end of the lamp envelope in order to optimize the position of the getter therein, while avoiding oxidation of the getter material during the lamp sealing process. Lamp efficacy and starting aid performance are improved, while getter operation is optimized.
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