ELECTRODELESS DISCHARGE LAMP, ELECTRODELESS DISCHARGE LAMP LIGHTING DEVICE, ULTRAVIOLET IRRADIATION DEVICE, AND FLUID PROCESSING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide proper mercury vapor pressure to increase the efficiency of an electrodeless discharge by regulating the amount of mercury sealed in the envelope of an electrodeless discharge lamp, and performing the cycle of heating, vaporizing, condensing, dropping, collecting, and again heating and vaporizing the mercury particles. ;SOLUTION: Argon and mercury are sealed in a discharge space 12 inside an envelope 11 made of ultraviolet-transmitting quartz or ceramic into a sealed cylindrical shape, and electromagnetic energy for a discharge is transmitted from a high frequency generating device via an impedance matching device to an induction coupling coil 13 wound around the outer periphery of the envelope 11. The amount of the sealed-in mercury is 0.3mg /cm² or more per inner surface area of the envelope 11, so that the mercury heated by the induction coupling coil condenses in a cooling region and drops by its own weight; the lump of mercury 14 which collects at the lowest position inside the envelope repeats the cycle of being heated and vaporized again by the coil 13, with the mercury vapor pressure attaining the temperature at which it is regulated by a tube wall or higher, resulting in efficient emission of ultraviolet rays from an electrodeless lamp.;COPYRIGHT: (C)1998,JPO