| 摘要 |
PURPOSE:To increase the emitting output of ultraviolet rays by accommodating the electrodes at the ends of a straight luminous tube in water cooling jackets, and setting the temperature of cooling water passed in the jackets at 30-60 deg.C. CONSTITUTION:Both ends of a discharge lamp in which electrodes 2a, 2b are sealed at both ends of a straight luminous tube 1 and ultraviolet rays are emitted are accommodated in water cooling jackets 3a, 3b. The both ends of the luminous tube 1 are directly cooled with cooling water, and the temperature of the cooling water passing through the cooling jackets 3a, 3b is kept at 30-60 deg.C. Thereby, the emitting output of ultraviolet rays is increased without the restriction of lighting direction. The emitting output is not decreased by the cooling water circulated in the jacket, no pure water is requested to use as the cooling water, and the use of expensive stainless steel pipe in circulation passage is also eliminated.
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