DISCHARGE TUBE BODY FOR HIGH-TENSION DISCHARGE LAMP AND MANUFACTURE THEREOF

摘要

PURPOSE: To provide high thermal load and prevent the high corrosive effect of filled members for a long period by forming a ceramic hollow material of highly clear and pure aluminum nitride. CONSTITUTION: A frame 5 supports a highly pure AIN ceramic cylindrical discharge tube 8 axially provided in an outside bulb 1. Such AIN allows a high maximum temperature in usage (about 1,700 deg.C) and higher thermal load than that of silica glass, so that light emission and color quality are improved. The AIN also gas anticorrosive property for the halogen components of filled parts, so that anticorrosive metal guide members or end members can be used. The life of a lamp is thus extended.