| 摘要 |
A music box having an electricity generating function includes a mechanism for using a stored energy of a spiral spring to drive a drum at an increased speed via a worm shaft, an annular magnet fixed on the worm shaft and an electricity-generating coil opposed to the outer circumferential margin of the magnet to generate electricity in a non-contacting configuration so that the energy of the spiral spring is used to not only play music but also generate electricity.
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