| 摘要 |
PURPOSE: A monolithic seal for a sapphire metal halide lamp is provided to promote increased growth between sapphire tube and the PCA end cap. CONSTITUTION: A high pressure discharge lamp comprises a sapphire tube(12) having an interior surface defining an interior volume, and having an exterior surface defining an outside diameter, at least one end cap closing an end of the sapphire tube, and adjacent the exterior surface around the sapphire tube, the end cap comprising densified polycrystalline alumina doped with magnesium oxide(MgO) and yttrium oxide(Y2O3), the sapphire tube exhibiting crystalline growth into the end cap to provide a hermetic seal around the sapphire tube, an electrically conductive electrode hermetically sealed through the end cap to extend between the lamp exterior and the enclosed volume, and a fill material enclosed in the interior volume of the sapphire tube, the fill material capable of being excited to light emission by applied electric power.
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