| 摘要 |
PROBLEM TO BE SOLVED: To enhance a production speed and facilitate manufacturing, by making a condition in which interference color is seldom produced. SOLUTION: Photocatalyst chemical composed of titanium sol made by diluting alkoxide of titanium with alcohol and hydrolyzing it with acid catalyst is supplied to a spray nozzle 2 through a hose 3, and as a straight tube type arc tube 1 of glass is being rotated, the photocatalyst chemical is coated on the arc tube 1 by spraying the photocatalyst liquid-drops with diameter of 5-30μm, it is baked at 500 deg.C after drying, and photocatalyst film in a condition that flaky particles with diameter of 10-100μm are piled, is formed on the outer surface of the arc tube 1.
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