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    • 39. 发明授权
    • Transparent heat conserving coating for metal halide arc tubes
    • 用于金属卤化物电弧管的透明保温涂层
    • US5952768A
    • 1999-09-14
    • US332317
    • 1994-10-31
    • Jack M. StrokGary R. AllenThomas G. Parham
    • Jack M. StrokGary R. AllenThomas G. Parham
    • G02B5/28H01J61/35H01J61/40H01J61/52H01J61/82H01J61/34
    • H01J61/523G02B5/281H01J61/35H01J61/40H01J61/827H01J61/34
    • A metal halide arc tube is provided having a light-transmitting envelope and electrodes for generating an arc discharge within a sealed chamber of the envelope. The envelope includes a transparent film at a cold region of the sealed chamber where metal halides migrate and condense. The transparent film transmits visible radiation and absorbs ultraviolet radiation emitted by the arc to impose an additional heat load on the cold region so that a high metal halide vapor pressure can be maintained. The temperature of a hot region of the envelope can be maintained at a lower level by reducing power input or increasing chamber surface area. Preferably, the transparent film reflects infrared radiation emitted by the light source back to the arc to increase efficiency and further increase the temperature of the cold region due to decreased thermal emittance. The transparent film is preferably a dichroic coating having alternating layers of high and low index of refraction refractory materials.
    • 提供一种金属卤化物电弧管,其具有透光外壳和用于在封套的密封室内产生电弧放电的电极。 信封包括在密封室的冷区域的透明膜,其中金属卤化物迁移和冷凝。 透明膜透射可见光并吸收由电弧发射的紫外线辐射,以在冷区域施加额外的热负荷,从而可维持高的金属卤化物蒸汽压力。 通过减少功率输入或增加腔室表面积,可以将外壳的热区域的温度保持在较低的水平。 优选地,透明膜将由光源发射的红外辐射反射回电弧,以提高效率,并由于热发射率的降低而进一步提高冷区的温度。 透明膜优选是具有高折射率和低折射率耐火材料的交替层的二向色涂层。