| 摘要 |
PURPOSE: To improve the first transition characteristics at low temperature, regarding an ultraviolet discharge lamp with mercury vapors sealed into a vessel, together with rare gases. CONSTITUTION: This ultraviolet fluorescent lamp contains mercury vapors sealed, together with rare gases, into a vessel 1 sized to an outer diameter equal to or less than 4.8mm and overall length equal to or less than 50mm, and having a phosphor coated on the internal surface thereof. Also, a pair of discharge electrodes 3 are provided inside or outside the vessel 1. In this case, the first transition characteristics of ultraviolet emitted light at a discharge start is kept at least equal to 0.14mW/cm<2> /sec. at 0 deg.C under the application of discharge power equal to 2W or below. Also, rare gases at pressure between 6 and 13kPa are sealed, together with mercury vapors, and a relationship of t (ϕ+1)<=1.11 is established between the inner diameterϕof the vessel and its thickness (t).
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