Disclosed is an enlarged distance between the electrodes, by inhibiting both the discharge between the electrodes and the arc tube, to provide a discharge lamp lifetime can be achieved.
A discharge lamp 13 of the present invention includes a luminous bulb 16 and a pair of electrodes 17. Electrode 17 includes a core 23, a coil portion 24 of the metal wire 27 to the core member 23 is rotated three or more layers wound, the ends of the core member 23 on the side where the other electrode is disposed relative to the coil unit 24 It includes a tip portion 25 composed of a conductor provided, a rear end portion 26 made of a conductor provided on the opposite side of the distal portion 25 relative to the coil unit 24, to. The rear end portion 26, first has a first diameter portion 26A having a first diameter, a smaller second diameter than the first diameter at the position remote from the coil portion 24 than the first diameter portion 26A includes a 2-diameter portion 26B, the.
.TECHNICAL