HIGH PRESSURE DISCHARGE LAMP

摘要

PROBLEM TO BE SOLVED: To alleviate thermal stress generated in an arc tube under a condition of a high operation pressure of about several tens of atmospheric pressure and horizontal lighting. SOLUTION: This high pressure discharge lamp has a supporting structure for supporting an arc tube 1 so as to restrain displacement toward the direction crossing the axial line at right angle. By a temperature change at the time of switching a lighting state to a light-out state, thermal stress is generated by a pair of thermal stress generating members 15, 16. This thermal stress acts as a force oriented downward in a perpendicular direction relative to side tubes 1b, 1c of the arc tube 1 of which the axial line L is arranged in a posture extending in a horizontal direction and as a force oriented outward relative to the arc tube 1. COPYRIGHT: (C)2005,JPO&NCIPI