High pressure discharge lamp and method for producing it

摘要

A high pressure discharge lamp (10) includes a quartz glass bulb (1) having a sealing portion; and a pair of electrodes (2A and 2B) . Each electrode of the pair of electrodes (2A and 2B) is disposed so as to be opposite the other in the quartz glass bulb (1). The quartz glass bulb (1) of the high pressure discharge lamp (10) contains at least mercury and a halogen gas. The partial pressure of oxygen (0) in the quartz glass bulb (1) is about 2.5 X 10<-3> Pa or less and the partial pressure of the halogen gas in the quartz glass bulb (1) is in the range between about 1 X 10<-8> mu mol/mm<3> and 1 X 10<-7> mu mol/mm<3>. <IMAGE>