ELECTRODE FOR DISCHARGE LAMP

摘要

PURPOSE:To prevent the occurrence of crack in an emitter by depressing the surface of an emitter mounted in a metal pot then pressure contacting a stopper ring on its surface. CONSTITUTION:A stopper ring 4 equipped with a plurality of needle members 42 projecting toward the central portion at the inside of a ring section 41 is pressure contacted on the surface of an emitter 2 mounted in a metal pot 1. The surface of the emitter 2 is depressed except the circumference. The stopper ring 4 is pressure contacted such that the ring section 41 is place along the circumferential face of the emitter 2 while the needle section 42 is placed along the depressed face of the emitter 2.