Parkhurst & Wendel, L.L.P.
Cold-cathode fluorescent lamp
The present invention has an object to provide a cold-cathode fluorescent lamp which can suppress sputtering caused by electric discharge and reduce consumption of mercury so as to achieve a longer lifetime even if a lamp current is large and a lighting tube has a small diameter. The cold-cathode fluorescent lamp according to the present invention is characterized in that a distance between the inner surface of the lighting tube and the outer surface of a cylindrical electrode is set such that electric discharge develops mainly on the inner surface of the cylindrical electrode. When the lighting tube has an inside diameter D1 of 1 to 6 mm and the maximum lamp current is 5 mA or more, an outside diameter D2 of the cylinder electrode is preferably set at D1&#8722;0.4 [mm]&lE;D2<D1. 
Matsushita Electric Industrial Co., Ltd.
H H
H01J H01J
inventional inventional
Toshihiro Haruo Hirofumi Shinji
Terada Yamazaki Yamashita Kihara