| 摘要 |
<p>PROBLEM TO BE SOLVED: To stably maintain electrode strength even during lighting a lamp in an electrode in which a heat transmission body is encapsulated.SOLUTION: In a discharge lamp, a positive electrode 30 is formed by solid phase bonding a trunk member 32 in which a recess 33 containing a heat transmission body M is formed and a lid member 36 provided with a projection 46 to be fitted to the recess 33. The recess 33 is so formed that a sealed space 50 becomes thinner from a tip part of an electrode toward a rear end part. A diameter DM near a projection surface 46S is smaller than a diameter DN at an intermediate part.</p> |
