Patent ID: 7988319

Claim:
A light-emitting device driven by an inertial power, comprising: an electromagnetic module, comprising: a magnetic element; a magnetic-conductive element, for generating a magnetic field in response to the magnetic element; and at least one wire, wound around the magnetic-conductive element; an inertial module comprising: a gear set, connected to the magnetic element, and the gear set has a plurality of gears engaged with each other in pairs; and a gravity bump, connected to the gear set, for driving the gear set to rotate the magnetic element under an inertial effect, wherein the magnetic field generated by the magnetic-conductive element changes due to the rotation of the magnetic element, and the wire generates a drive current in response to the changing of the magnetic field; and a light-emitting module, electrically connected to the wire, for emitting a light being driven by the drive current.