HIGH-PRESSURE DISCHARGE LAMP AND ULTRAVIOLET-RAY IRRADIATION DEVICE

PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp and ultraviolet-ray irradiation device such that an air cooling system cannot be employed, an electric conductive wire is arranged as a proximity conductor so as to suppress cracking.SOLUTION: A high-pressure discharge lamp 10 according to an embodiment comprises an airtight container 11, a pair of electrodes 12, 12, an enclosure 13, and an electric conductive wire 14. The airtight container 11 has a discharge space 111, which transmits ultraviolet rays. The pair of electrodes 12, 12 are provided at both ends of the airtight container 11 respectively and arranged having one-end sides opposed to each other in the airtight container 11. The enclosure 13 includes at least a rare gas and mercury, and is charged in the airtight container 11. The electric conductive wire 14 is at least partially brought into contact with an outer peripheral surface 11a of the airtight container 11 and wound in a tensed state around the outer peripheral surface 11a of the airtight container 11 along a direction in which the pair of electrodes 12, 12 extend, the coefficient of thermal expansion being not more than 25 times the coefficient of thermal expansion of the airtight container 11.SELECTED DRAWING: Figure 1 【課題】空冷方式が採用できない場合において導電性ワイヤを近接導体として配置し、クラックの発生を抑制する高圧放電ランプ及び紫外線照射装置を提供する。【解決手段】実施形態の高圧放電ランプ１０は、気密容器１１と、一対の電極１２，１２と、封入物１３と、導電性ワイヤ１４とを具備する。気密容器１１は、放電空間１１１を有し紫外線を透過する。一対の電極１２，１２は、気密容器１１の両端部に各々設けられ、一端を気密容器１１内で対向させて配置される。封入物１３は、少なくとも希ガスと水銀とを含み気密容器１１内に封入される。導電性ワイヤ１４は、少なくとも一部を気密容器１１の外周面１１ａに密着させ一対の電極１２，１２が延びる方向に沿って気密容器１１の外周面１１ａに緊張させて巻付けられ、熱膨張係数が気密容器１１の熱膨張係数の２５倍以下である。【選択図】図１