| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a circular fluorescent lamp having a highly reliable base at a low cost. <P>SOLUTION: A protrusion in contact with the end face of an annular tube is provided in the base of a circular fluorescent lamp where a plurality of annular tubes having different annular diameters are provided substantially concentrically, one discharge path passing through two electrodes provided at different ends of the plurality of annular tubes is formed by coupling the ends thereof, and a base is provided to cover the ends of the annular tubes. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
