METAL CONCAVE REFLECTING MIRROR, LIGHT SOURCE USING THE SAME, LIGHT SOURCE DEVICE, AND ITS OPERATION CIRCUIT

摘要

It is possible to use a concave reflecting mirror having at least a concave reflecting portion formed by metal for a discharge lamp. The concave reflecting mirror includes a metal concave reflecting portion (2a) and a neck portion (2b) for mounting a sealed portion. The neck portion protrudes toward the rear surface from the center of the metal concave reflecting portion (2a) and is formed via an insulating member (3) or by an insulating material. A sealed portion (18) of the high voltage application side of a high-voltage discharge lamp (10) to which DC voltage of 1000V to 4000V is continuously applied upon start is mounted on the neck portion (2b). It is possible to improve the accuracy of the curved surface of the concave reflection surface (2c). This reduces irregularities of brightness, enables use of the multi-layer deposited film of low heat resistance, and further reduces the cost.