Abstract: To provide a high pressure discharge lamp in which no fusing of the metal foil occurs even if the high pressure discharge lamp is switched on for a certain time a high pressure discharge lamp is provided having a discharge vessel comprised of a light emission part and sealing parts made of glass connected to opposite ends of said light emission part; metal foils buried in a respective one of said sealing parts; a pair of electrodes comprised of core rods and tip end parts, said tip end parts being arranged oppositely to each other in the light emission part; and said core rods being melted and fused together with a respective one of the metals foils; wherein cavities are formed which reach from a surface of a respective one of the metal foils to an interior of the core rod, and the glass constituting said sealing part has entered into said cavities.

Abstract: An extra high pressure mercury lamp that includes an arc tube, which includes a light emission section enclosing 0.2 mg/mm3 or more of mercury, sealing sections that respectively extend from both ends of the light emission section, a pair of electrodes that face each other in the light emission section, wherein an electrode axis portion of each electrode is held by the sealing portion, and a metallic foil that is buried in the sealing section and that is electrically connected with the electrode axis portion, wherein the metallic foil has a covering portion fixed to the electrode axis portion so as to roll up the electrode axis portion; an extended portion that extends towards the outside of a tube axis without being connected with the electrode axis portion; and a main body portion that extends from the extended portion.

Abstract: To provide a high pressure discharge lamp in which no fusing of the metal foil occurs even if the high pressure discharge lamp is switched on for a certain time a high pressure discharge lamp is provided having a discharge vessel comprised of a light emission part and sealing parts made of glass connected to opposite ends of said light emission part; metal foils buried in a respective one of said sealing parts; a pair of electrodes comprised of core rods and tip end parts, said tip end parts being arranged oppositely to each other in the light emission part; and said core rods being melted and fused together with a respective one of the metals foils; wherein cavities are formed which reach from a surface of a respective one of the metal foils to an interior of the core rod, and the glass constituting said sealing part has entered into said cavities.