| 摘要 |
The lamp envelope is formed of a metallic reflector having at each of its ends a cylindrical ceramic insulator and, closing the open ends of the ceramic insulators, metallic cathode and anode support assemblies, the anode support assembly including an optical window sealed across an aperture. Cathode and anode electrodes extend into the envelope from the cathode and anode support assemblies concentrically with the reflector to form an arc gap at the focal point of the reflector. A third electrode connected to the reflector extends into the region of the arc gap for starting purposes. A cylindrical metallic heat shield extends from the cathode end of the reflector into the cylindrical ceramic insulator at that end in order to shield the joint between the cylindrical insulator and the reflector from thermal radiation and convection from the adjacent arc gap.
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