| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the tracking ability of a prism without increasing cost, when power is restored. SOLUTION: A solar lighting system 10 comprises a light collecting part 11 provided with a light collecting prism 13, a light duct part provided along the light collecting part and a controller 15, the controller using power supplied from a solar battery 19 to control the prism to move while tracking the sun. The controller calculates the tracking position A of the prism corresponding to the movement position of the sun at the time when power coming short is recovered, so that the prism can be moved from the tracking position B of the prism at the time when power comes short to the tracking position A in the shortest movement range.</p> |
