LOW-PRESSURE MERCURY VAPOR DISCHARGE LAMP

摘要

PROBLEM TO BE SOLVED: To provide a low-pressure mercury vapor discharge lamp capable of suppressing temperature variation of the coldest point part, of preventing dispersion of lamp characteristics between lamps from occurring, and of improving the lamp characteristics. SOLUTION: This low-pressure mercury vapor discharge lamp comprises: a double spiral arc tube 2; a holder 3 for holding both ends of the arc tube 2; a lighting circuit 4 formed and incorporated on the side opposite to the arc tube of the holder 3; a case 6 mounted to the holder 3 so as to cover the lighting circuit 4 while having a bulb base 5; and an outer tube 7 mounted by covering the arc tube 2. A projection part 9 being a coldest point presumption part of the arc tube 2 is embedded in a thermally conductive medium 10 and thermally connected thereto. For the thermally conductive medium 10, a substance prepared by mixing a silicone resin with aluminum powder is used. COPYRIGHT: (C)2005,JPO&NCIPI