| 摘要 |
PURPOSE:To preclude malfunction and to accurately track the sun by providing a couple of photodetecting elements, utilizing the shadow of a main body formed with the sunshine and comparing the photodetection quantities of the photodetecting elements with each other, and tracking the sun. CONSTITUTION:When the photodetection quantity of the sunshine is larger than a specific value, the photodetecting elements we fine adjustment sensors 33 and 34 generate a difference in photodetection quantity because of the shadow of the main body 35 formed with the sunshine. At this time, the edges of the shadows of the quadrangular prismatic main bodies 35 of the fine adjustment sensors 33 and 35 becomes clearer than those of cylindrical ones. The rear wall surfaces of the main bodies 35 are tapered, so the sunshine is prevented by the tapered surfaces from being reflected irregularly, and consequently the edges of the shadows of the main bodies 35 becomes sharp. Thus, the edges of the shadow of the main bodies 35 with the sunshine becomes clear and sharp, so the photodetecting elements we which operate with a slight photodetection quantity never malfunction. Further, the sunshine beams are incident on photodetecting elements (w), (e), (u), and (d) are guided by a guide groove 38, so those photodetecting elements accurately photodetect the parallel light beams of the sunshine.
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