UV IRRADIATION DEVICE

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PROBLEM TO BE SOLVED : To suppress early devitrification or blackening when input power is high by restricting the distance between an UV lamp and a cooling unit which is affected by the lamp temperature.SOLUTION : A pair of discharge electrodes 15a and 15b is disposed oppositely in the axial direction within an airtight light emitting tube 14 with a discharge space 13 made of UV transmitting quartz glass. An enclosed material composed of rare gas, mercury, halogen and light emitting metal is sealed in the discharge space 13 in an amount sufficient to maintain an arc-discharged state therein, whereby a UV lamp 100 is constituted to emit UV light when lighted. The lamp 100 is stored within an inner tube 21 of a cooling unit 200 having a double structure configured to circulate a cooling liquid 24 for cooling the lamp 100 between the inner tube 21 and an outer tube 22 while transmitting UV light. The distance D [mm] between the lamp 100 and the inner tube 21 of the cooling unit 200 and the input power P [W/cm] of the lamp 100 satisfy the relation of D≤-0.2P+35.COPYRIGHT : (C)2011, JPO&INPIT