SHORT ARC DISCHARGE LAMP WITH REFLECTING MIRROR

摘要

PROBLEM TO BE SOLVED: To satisfy the smaller size of the device and the higher efficiency of its optical characteristics required as the light source device for a liquid crystal projector of a mobile system. SOLUTION: The short arc discharge lamp 11 with the reflecting mirror 1 consists of the reflecting mirror 1 made of glass which has a reflection surface consisting of an even order function on its inside surface and is formed by die pressing and the short arc discharge lamp 11 which is internally sealed with a pair of electrodes 12a and 12b, is formed with sealing parts 14a and 14b at both ends and is fixed with a mouthpiece 15 in the one sealing part 14b. The short arc discharge lamp 11 is arranged to be aligned with the optical axis of the reflecting mirror 1 and the mouthpiece is fixed into the slot of a hollow neck part 4 formed at the center in the bottom of the reflecting mirror 1. The peripheral part of the mouthpiece on the inside surface of the slot 3 of the hollow neck part is worked to a cylindrical shape and a narrowest part 4b is formed toward the reflection surface from the cylindrical part 15a. A die pressing part 4a is formed toward the reflection from the narrowest part 4b so that the die pressing part 4a comes into contact with the reflection surface while flaring.