| 摘要 |
<p>This invention provides a compact, efficient and well-designed circular fluorescent lamp with high output power. The circular fluorescent lamp has less non-luminant region and good characteristics of luminous intensity distribution, and keeps high level of lamp lumen output. Circular arc tubes (1, 2) are disposed concentrically on the same plane. Electrodes (3, 4) are attached to the tube-end parts of the one side of the circular arc tubes (1, 2) respectively, and the other tube-end parts (11, 12) of non-electrode side are sealed. The circular arc tubes (1, 2) are joined each other near the tube-end parts (11, 12) of the non-electrode side with a bridge-jointed portion (5), so that a discharge path is formed between the electrodes (3, 4) inside the arc tubes (1, 2). The tube outer diameter of the circular arc tubes (1, 2) is 14mm, the circle outer diameter of the outer circular arc tube (1) is 150mm, and the circle inner diameter of the inner arc tube (2) is 90mm. The distance measured along the center line of the tube from the point corresponding radially to the end part of the bridge-jointed portion (5) to the sealed tube-end part (11) of the outer circular arc tube (1) is 11mm, and the distance measured along the center line of the tube from the point corresponding radially to the end part of the bridge-jointed portion (5) to the sealed tube-end part (12) of the inner circular arc tube (2) is 6mm. <IMAGE></p> |
