Metal halogen lamp esp for liquid crystal projector

摘要

A metal halogen lamp has a cathode (11) and anode (12) in the discharge chamber of a quartz glass tube (10), separated by less than 2.9 mm. The tube is filled with mercury and a metallic halide. The ratio of the maximum inner diameter to the extent of the cathode from the wall of the discharge chamber is about 1.9. The discharge chamber is ellipsoidal and the centre of the arc is displaced from the geometric centre of the chamber. The tip of the anode is also displaced from this geometric centre. The rated power of the DC supply for the lamp is between 100 and 400 watts. The lamp is used in liquid crystal projectors.