LONG ARC-TYPE DISCHARGE LAMP

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PROBLEM TO BE SOLVED : To provide a long arc-type discharge lamp which is lighted stably for a long time by suppressing the exhaustion of an emitter (electron radiative substance) at an early stage and preventing melanism or white turbidity of a long and ultraviolet ray transmissive luminous tube, the long arc-type discharge lamp being lighted in an AC manner by oppositely disposing a pair of electrodes within the luminous tube, encapsulating a rare gas and a metal as a luminescent material and containing a rare earth oxide in the electrode. SOLUTION : When an average value of a lamp current is defined as I (ampere : A) and a volume for 3 mm from an electrode tip is defined as V (mm3), 0.4≤(I/V)≤1.0 is established. SELECTED DRAWING : Figure 2 COPYRIGHT : (C)2016, JPO&INPIT