DISCHARGE LAMP, AND ITS FORMING METHOD

PROBLEM TO BE SOLVED: To enable to inexpensively manufacture with a simple structure and the number of manufacturing processes reduced, while extending a life time of a discharge lamp by restraining occurrence of cracks at a glass bulb part as much as possible. SOLUTION: The discharge lamp, sealing an aperture end of a sealing body glass 2 in a linear cylindrical shape by a sealing body 3 with an electrode rod 4 penetrated, has a structure joining an end surface of the sealing body glass 2 made of quartz glass that is super-hard glass with a low thermal expansion coefficient, and an end surface of a sealing body 3 made of borosilicate glass that is hard glass with nearly the same thermal expansion coefficient of the electrode rod 4 made of tungsten with a higher thermal expansion coefficient than that of the sealing body glass 2, by irradiating a femtosecond laser such as a laser with an ultrashort light pulse width to a crimping part in a crimping state. COPYRIGHT: (C)2008,JPO&INPIT