COLD CATHODE FLUORESCENT LAMP

摘要

PROBLEM TO BE SOLVED: To provide a cold cathode fluorescent lamp which can reduce mercury consumption through control of sputtering by electric discharge and realize long operation life even if lamp current is large and an arc tube is thin in diameter. SOLUTION: Electric discharge proceeds across the distance d between an internal surface of the arc tube 1 and an external surface of the cylindrical electrode, mainly along an internal surface of a cylindrical electrode. Specifically, when the internal diameter of the arc tube 1 is in the range of 1 to 6 mm and maximum lamp current is 5 mA or more the external diameter D2 of the cylindrical electrode 4 is designed to be in the range of D1-0.4<=D2<D1.