| 摘要 |
PURPOSE:To realize a reciprocal electron flow in a concentric circle tube body and obtain a fluorescent tube easy for production and capable of being used for new usage by collecting electrodes on one end side of the fluorescent tube to form a double tube. CONSTITUTION:A tube 2 with its tip opened is inserted into a tube body 1 with its tip closed to the vicinity of the tip of the closed tube body while some space is left, and filament-like electrodes 3, 4 are provided on the other end side within the inner tube and at portions sandwiched by both tubes. Accordingly, the electrodes are concentrated on one end side, thus the usage of a new fluorescent lamp can be expanded. |
