| 摘要 |
PROBLEM TO BE SOLVED: To provide a lamp exposed to a smaller thermal stress and in turn having a longer service life. SOLUTION: The discharge lamp is held in an axial direction in a outer tube 1. An end part 6 of the outer tube, farther from a cap, is a standard one, constituted so as to avoid a symmetric convex face shape in a direction of a radius, and as a result, return reflection to a discharging vessel 10 is substantially prevented. COPYRIGHT: (C)2007,JPO&INPIT |
