| 摘要 |
PURPOSE:To simplify the structure and to produce a device inexpensively, by serving a wheel of a bicycle as a body of rotation of a magnet. CONSTITUTION:A lamp device for a bicycle is fixed to a magnet 1 secured to a rotating wheel and is also fixed to a frame close by without touching the rotating locus of this magnet 1. It is composed of a generator coil 2 which generates electricity by electromagnetic induction caused by flux variation in passing the magnet and of a luminant 3 with which the light is turned ON when connected to this coil 2. The magnet 1 is U-shaped as a whole and fixed to two spokes 5 of the wheel through a clamp 4. Since the magnet 1 is fixed to the wheel while the generator coil 2 to the frame in this way and no moving elements are there, the structure is so simplified that mass production is possible inexpensively. |
