Discharge lamp, ultraviolet ray irradiation apparatus and method of using the apparatus
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United States of America Patent
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Jan 27, 2004
Grant Date -
Dec 19, 2002
app pub date -
Nov 13, 2001
filing date -
Jun 14, 2001
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Abstract
Discharge lamp includes a synthetic quartz glass tube having an inside diameter of 8 mm or over and a pair of filaments provided within and at opposite ends of the glass tube with an L (cm) filament-to-filament distance, and rare gas and metal including at least mercury are sealed in the interior of the glass tube. Lamp voltage V (V) and lamp current I (A) during illumination of the discharge lamp, filament-to-filament distance L (cm) and inside diameter D (cm) of the glass tube have relationship represented by the following mathematical expression. Namely, (V-Vf)/L=X/( D.multidot. I) and 2.6.ltoreq.X.ltoreq.4.2, where Vf is a constant factor depending solely on a illuminating power source and where that if the discharge lamp is illuminated by a high-frequency power source of 1 kHz or over, Vf is 10, but if the discharge lamp is illuminated by a power source of 1 kHz or below, Vf is 50.
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