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发明公开
CN1873899A 超高压水银灯 失效 - 权利终止

超高压水银灯
摘要：
本发明的目的在于提供一种超高压水银灯，在其起动时和点灯时，构成电极的钨不会飞散，发光管的内部不会变黑。本发明的超高压水银灯，在发光管内突出而相对地配置有一对电极，并且作为发光物质封装0.15mg/mm3以上的水银，其特征在于，上述一对电极中的至少一方电极包括由钨构成的轴部和起动辅助部，上述轴部和/或上述起动辅助部含有容易放射电子的物质，在发光管内突出的上述电极中，设含有容易放射电子的物质的部位的表面积为S(mm2)、设该部位中的容易放射电子的物质的浓度(重量％)为A时，满足1≤S/A(mm2/重量％)≤1×104的关系。
摘要（英）：

An ultra-high pressure mercury lamp in which the tungsten comprising the electrodes is prevented from spraying during starting and operation, and blackening on the inside wall of the arc tube is prevented is achieved in that at least one of the electrodes has an axial part which is made essentially of tungsten and a starting part which is made essentially of tungsten, at least one of the axial part and of the starting part containing an electron emission material with a smaller work function than tungsten such that the value of S/A in mm2/% by weight is in the range 1<=S/A<=X104, S in mm2 designating the surface area of the part of the electrode projecting into the arc tube containing the electron emission material and A in % by weight indicating the concentration of the electron emission material in this part.

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