Patent ID: 6913503
Filing Date: 2005-07-05
Classification: H01J

Abstract:
1. A method for manufacturing a high pressure discharge lamp including a quartz glass bulb; a pair of electrodes, each electrode of said pair of electrodes being disposed so as to be opposite the other in said quartz glass bulb and containing potassium oxide in the range between about 20 ppm and 40 ppm; and at least mercury, a halogen gas, and an inert gas contained and sealed in said quartz glass bulb, comprising the steps of: carrying out an evacuation process in which said quartz glass bulb is evacuated so that the partial pressure of oxygen (O) in said quartz glass bulb becomes about 2.5×10 carrying out a mercury sealing process in which said mercury is sealed in said quartz glass bulb so that the amount of said mercury with respect to the space volume in said quartz glass bulb is about 0.15 mg/mm carrying out a halogen gas introduction process in which said halogen gas is introduced into said quartz glass bulb so that the partial pressure of said halogen gas in said quartz glass bulb falls in the range between about 1×10 carrying out an inert gas introduction process in which said inert gas is introduced into said quartz glass bulb so that the partial pressure of said inert gas in said quartz glass bulb falls in the range between about 6×10