| 简介 |
In a low-pressure mercury vapour discharge lamp (L) which has an effective light emission length not shorter than 40 cm and a lamp input density not lower than 0.9W/cm and which contains at least mercury as a light-emitting metal and an activating rare gas, the mercury is provided in an amalgam (13) with another metal, and a thin coating (12) functioning to trap a very minute amount of the mercury is formed on a glass inner surface of the discharge lamp. The thin coating (12) contains, as its main ingredient, an oxide of at least one metal selected from a group of aluminum, silicon, calcium, magnesium, yttrium, zirconium and hafnium. The amalgam (13) is secured to one or more locations of the glass inner surface facing a discharge space of the discharge lamp (L). Thus, it is possible to lower a necessary discharge-starting voltage and accelerate a rise time of a light amount of ultraviolet rays. |
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