Patent ID: 7275844
Filing Date: 2007-10-02
Classification: B62J,H02K

Abstract:
1. A bicycle headlamp comprising: a rotor comprising a plurality of magnet plates attached to spokes of a bicycle wheel along the circumference of the wheel, each magnet plate having a form of an arc of a certain circle and comprising a plurality of magnets disposed at regular circumferential spacings with alternating south and north poles; a stator comprising a power-generating coil comprising a coil and an iron core disposed in a fixed position to face the magnetic pole faces of the magnet plates of the rotor; and a case separated from the stator, or for containing all of the stator, wherein the case contains at least a headlamp electrical circuit comprising a resonance circuit formed of the power-generating coil of the stator and a capacitor connected in series with the-power-generating coil, and having, as a resonant frequency, a power-generation frequency determined by the positions where the magnets and the power-generating coil are disposed, when the bicycle is pedaled at a predetermined speed, and a rectifying and smoothing circuit for rectifying, smoothing, and outputting electric power obtained from the power-generating coil of the resonance circuit, a plurality of light-emitting diodes that are lit by the electric power supplied from the headlamp electrical circuit, and a condenser lens for focusing light emitted from the plurality of light-emitting diodes in front of the bicycle and for illuminating the roadway, wherein the lens is a dome-shaped lens disposed for each of the plurality of light-emitting diodes, the dome-shaped lens has a curvature, a diameter, and a thickness calculated to obtain a specified level of illumination in a specified circle at a specified distance by focusing light; and a reflector is provided on a flat-plate portion above the lens, by applying a treatment for producing diffused reflection, so that approaching of the bicycle can be noticed ahead of the bicycle.