| 摘要 |
A high pressure discharge lamp includes a quartz glass bulb, a conductive element which is sealed at a sealing portion of the bulb, and a pair of electrodes. Each electrode is disposed in the quartz glass bulb so as to be opposite the other and connected to the conductive element. A part of each electrode is sealed with the quartz glass bulb at the sealing portion so as to generate a contacting portion formed by the part of each electrode and the bulb. The maximum length, L<SUB>max</SUB>, of the contacting portion is defined as: L<SUB>max </SUB>(mm)<=200/(PxD); and the minimum length, L<SUB>min</SUB>, of the contacting portion is defined as: L<SUB>min </SUB>(mm)>=0.8/(D<SUP>2</SUP>xpi) or L<SUB>min </SUB>(mm)>=0.7 whichever is longer, where D is the diameter (mm) of the electrode and P is the power (W) supplied to the electrode.
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