Low-pressure mercury vapor discharge lamp and ultraviolet-ray irradiating apparatus and method using the same
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United States of America Patent
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Mar 25, 2003
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N/A
app pub date -
Jun 8, 2000
filing date -
Jun 11, 1999
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Abstract
In a low-pressure mercury vapor discharge lamp which has an effective light emission length not shorter than 40 cm and a lamp input density not lower than 0.9 W/cm and which contains at least mercury as a light-emitting metal and an activating rare gas, the mercury is provided in an amalgam with another metal, and a thin coating functioning to trap a very minute amount of the mercury is formed on a glass inner surface of the discharge lamp. The thin coating 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 is secured to one or more locations of the glass inner surface facing a discharge space of the discharge lamp. 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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