| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a power generation method for instantaneously generating induction current in a coil by chiefly using back-and-forth motion of external energy; and provide a device which lights by electric energy generated by the power generation method.SOLUTION: In a door opening/closing preannouncement device: a moving part is formed such that a rotating plate 16 is turned and speed of the rotation is amplified by being linked to some toothed gears having different number of teeth and further, a connection plate which changes the rotational motion to repeatedly performed lateral motion, and the connection plate is connected to a magnet which generated induction current in a coil; and on the other hand, a fixing part is formed such that the coil is provided on the outside of a pipe 14 where the magnet moves laterally. In the door opening/closing preannouncement device, a device which can make the magnet move repeatedly and instantaneously in the coil with the speed amplified by rotation of the rotating plate to obtain instantaneous electricity passing through the coil, and make the magnet move instantaneously in the coil again by using stretching properties of a tension spring and the like to obtain electricity, and a device which lights by the electricity are attached to a door 1 and operated thereby to make it possible to preliminarily perceive opening/closing of the door.</p> |
