| 摘要 |
PROBLEM TO BE SOLVED: To provide a discharge lamp arc tube without causing foil separation in a pinch seal part. SOLUTION: In this discharge lamp arc tube, electrodes 6 are oppositely formed in a sealed glass bulb 12 filled with a light-emitting material and the like by pinch-sealing regions including molybdenum foil 7 of electrode assemblies A and A' each composed by serially connecting and integrated an electrode rod 6, the molybdenum foil and a lead wire 8. The surface of the molybdenum foil 7 sealed in the pinch seal part 13 is formed with a fine uneven rough surface 7c with an etching process comprising oxidation and reduction applied, and changed into a form with the inside of the fine uneven part on the molybdenum foil surface filled with quartz glass without space, so that adhesion (mechanical joint strength) in the interface between the quartz glass and the molybdenum foil 7 is improved and the service life of the arc tube is extended by restraining the foil separation.
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