Patent ID: 6274982
Filing Date: 2001-08-14
Classification: H01J

Abstract:
A high-pressure discharge lamp produced by the method comprising the steps of:providing a tube made of sapphire;providing an end cap made of unsintered polycrystalline alumina, said end cap comprising a main wall defining an annularly-shaped groove axially extending from a side of said main wall;heating said end cap until said end cap is presintered to remove binder;placing said presintered end cap on an end portion of said tube to form an interface therebetween; andheating said presintered end cap and said tube until said end cap is sintered onto said tube and said sapphire tube grows into said end cap to form a monolithic seal at the previous interface between said end cap and said tube, said monolithic seal existing at an interface between an outer groove surface of said end cap groove and an outer surface of said tube.