Kozo Uemura

Improvement of UV Intensity Maintenance of Electrodeless UV Lamp by Reducing Coil Voltage: 汚水殺菌用無電極放電灯装置の開発報告-その1

図1装 置全体構成 3.検 討 ランプ軸方向単位長当た りに加わる電界が大きいと、ランプ の同電界作用箇所付近に部分的黒化が生じることは、経験的に 把握 していた。よって、より低いコイル電圧でランプに一定電 力を投入する方法を検討 した。 4.方 法 同一仕様コイルで点灯周波数を低下し、より低いコイル電圧 でランプに一定電力を供給できるようにした。また、ランプか らの紫外線出力の遮光率を一定化するように、巻線ピッチを略 一定化し、コイルの仕様(tum× 並列数)を変化 して、コイル電 圧を低下した。 5.確 認 ランプ軸方向単位長当た りに加わる電界が小さくなるような コイルを用いると、ランプの早期黒化が抑制できること、を比 較実験で確認した。 6.ま とめ 点灯周波数とコイル仕様の検討により、一定電力をランプに 投入しつつ、コイル電圧を低下できた。これにより、ランプの 早期黒化を防止でき、長寿命な装置を実用化できた。 Improvement of UV Intensity Maintenance of Electrodeless UV Lamp by Reducing Coil Voltage. Ichiro Yokozeki, Kazuhiko Yoshikawa, 7hiji Shimokawa, Kozo Uemura 表1開 発品仕様

Characteristic improvement of inductively coupled electrode-less metal halide lamps

Summary form only given. Inductively coupled electrode-less metal halide lamps were expected to show high efficacy and good life performance and had been studied extensively. At first, at LS6 in 1992, a new inductively coupled HID lighting system was proposed. Since then, improvement of operating circuit efficacy and operation stability of the system has been discussed by using the current limitation of the co-axial cable for impedance matching circuit. On the other hand, dosing tin halides in those arc tubes was tried to extend their life. In this study, to put these systems into practical use, improving lamp efficacy, confirming effect of tin halides on their life performance and improving their operation stability by decreasing Q value, which is resonance constant of their impedance matching circuit, were attempted. As a result, the lamp efficacy reached 180 1m/W with white light and 58% of visible radiation power ratio to the input power was realized by optimizing rare gas pressure, input wattage, a sort of doses and by employing the elliptical-shape outer jacket with uniform temperature distribution on the arc tube surface. Their life performance was confirmed that the lamps with tin halides were abler to survive up to 60000 hours at rated load operation without decreasing lumen output, because tin halides absorb iodine gas generated in the arc tube. Optimizing the distance between the coil and the arc tube, the arc tube diameter and the rare gas pressure, Q value was decreased by 22% without reducing the lamp performance.