UV enhancer for discharge lamp and manufacturing method thereof

A method of manufacturing a UV enhancer for a discharge lamp provided to discharge lamp including an arc tube in which at least a light-emitting material and a starting gas are filled and a pair of electrodes are opposed to each other in a discharge chamber therein, the UV enhancer having a discharge tube that irradiates a UV-light to the discharge chamber for enhancing a starting of the lamp the method including:

• defining, in a quartz tube that constitutes the discharge tube, a light-emitting area having an internal electrode disposed therein on one side of a pinch seal area for sealing a metal foil of an electrode assembly comprising the internal electrode and a lead welded to ends of the metal foil, and a lead protrusion area formed on a second side of the pinch seal area for protruding the lead:
• simultaneously performing a heat-softening treatment for the pinch seal area and a glazing treatment for a tubular end of the lead protrusion area, in a state of inserting the electrode assembly from the lead protrusion area and protruding the lead from the lead protrusion area,
• pinching the pinch seal area heated during a heat-softening treatment and a glazing treatment between molds, thereby simultaneously forming a lead protrusion port while having the lead protrusion area remaining in a sleeve-like shape and a pinch seal portion sealing the pinch seal area, and molding a ridge to a position on a first surface of the pinch seal portion for positioning an external electrode at a predetermined insulation length away from the tubular end of the lead protrusion area, and
• a chip-off step of chipping-off a top end of the light-emitting area by burner-heating after a completion of pinching of the pinch seal.