HIGH PRESSURE GAS DISCHARGE LIGHT SOURCE AND COMPOSITE ELECTRODE FOR GAS DISCHARGE LIGHT SOURCE

摘要

The present invention relates to a high pressure gas discharge light source and a composite electrode for a high pressure gas discharge light source. The high pressure gas discharge light source comprises an electrically insulating material having an aperture filled with an ionizable light emitting gas and an ignition gas and having an aperture at both ends, and a substantially electrically conductive electrode having a diameter substantially equal to the diameter of the discharge orifice. The second version of the high pressure gas discharge light source according to the invention further comprises a soldering electrode extending in the discharge area and soldered to the discharge tube, as well as a plug made of insulating material of substantially the same diameter as the opening. In a third embodiment of the high-pressure gas-discharge light source of the present invention, the discharge tube is provided with a permanent coating of metal or a mixture of metal and insulating material in at least one orifice and outer portion thereof, wherein the metal is at least 50 In the fourth version of the high pressure gas discharge light source, the current conductor (13a) of the composite electrode (6a) is a substantially cylindrical body which is coated at least on its cylinder surface with a mixture of metal and insulating material. The present invention also relates to a composite electrode for use in a high pressure gas discharge light source comprising a coated conductor (13a) coated with a metal body and an insulating material on at least its cylindrical surface and welded or soldered to the base or side of the current conductor (13a). The metal contained in the coating mixture contains at least 50% by volume of molybdenum and the insulating material in the mixture contains at least 50% by volume of the same material as the cylindrical body. Another version of the composite electrode comprises an insulating material having at least a cylindrical body forming a cylindrical body shaped conductive conductor (13a) coated on at least one of its cylindrical sheaths. An electrode (14a) is connected to the inclined base of the current conductor by welding or brazing. A third version of the composite electrode comprises a coated conductor (13a) coated with a mixture of metal and insulating material, at least on its cylindrical shell, and an electrode (14a) welded or soldered to the side of the current conductor (13a). The electrode (14a) is axially identical to the axis of the other electrode opposite it. ŕ