A New-type of Xenon-Neon Barrier Discharge Fluorescent Lamps : Double Helical External Electrodes Lamp (DHEL)(<Special Issue>Light Sources Workshop, 2005 (1))

概要

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Recently as interests in environmental issues increase, demands for mercury-free fluorescent lamps are increasing because mercury is harmful to human beings and creatures. As one of the solutions of this issue the authors have developed a new-type of mercury-free fluorescent lamps using double helical external electrodes. In this paper the fundamental characteristics of Xenon-Neon discharge in the Double Helical External Electrodes Lamps (DHEL) such as the luminance, power consumption and lamp current are investigated. When the pressure ratio of Xe: Ne was fixed at 7:3, total pressure at 1.33 kPa and external electrode pitch as 10mm, luminance over 10000cd/m^2 is achieved. In addition as a prototype 1m length DHEL is prepared and demonstrated to show basically there is no limit in length of DHEL.