| 摘要 |
A light device for a bicycle includes a hollow main casing to be attached to a handlebar stem of the bicycle, a first magnet member, a second magnet member having a polarity opposite the first magnet member, a coil member disposed between the first and second magnet members, and a rotary magnet piece disposed adjacent to the first and second magnet members. The first and second magnet members, the coil member and the rotary magnet member are arranged inside the main casing. The rotary magnet member rotates with the front wheel of the bicycle. A light casing is attached to a front open end of the main casing. A light bulb is disposed inside the light casing and is electrically connected to the coil member. The rotation of the rotary magent piece induces electric current in the coil member which powers the light bulb.
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