Production method of discharge lamp

摘要

A discharge lamp manufacturing method that enables the energy loss of a laser beam irradiated from outside an arc tube to be suppressed when forming a pair of electrodes by fusion cutting a predetermined cutting site of a tungsten rod disposed within a sealed arc space. Even when a film of an arc material (e.g., mercury) forms on an inner wall of an arc tube ( 10 ) due to the arc material evaporating when the temperature of the arc tube ( 10 ) is raised as a result of a laser beam ( 60 ) being irradiated from outside the arc tube ( 10 ), this manufacturing method is able to eliminate the film through evaporation by heating the arc tube ( 10 ) with a coil heater ( 125 ) before irradiating the laser beam ( 60 ) again.