| 摘要 |
PROBLEM TO BE SOLVED: To enable installation in any place by an easy method and to receive electric power all day long by providing a secondary battery in which the electric power generated by a photoelectromotive force generating means is accumulated and performing switching between the electric power generated by the photoelectromotive force generating means and the electric power accumulated in the secondary battery. SOLUTION: This optical spatial transmission device 10 is equipped with a power supply part 203 comprising the solar battery 202 and the secondary battery 203. The power supply part 203 makes it possible to receive the electric power from the solar battery 202 in the day and from the secondary battery 203, charged with the electric power by the solar battery in the daytime, while the sun sets at night and an actuator for rotating a reflecting mirror is driven to correct the optical axis according to an opposite device. The actuator can be driven semipermanently with the electric power generated only with natural energy, so the need to lay a power cable is eliminated. Since the reflecting mirror is provided in an optical system, the reflecting mirror can be made small in size and the driving electric power of the actuator can be reduced. |
