| 摘要 |
PROBLEM TO BE SOLVED: To prevent an external force acting on a light receiving surface or a mechanism for supporting the light receiving surface from becoming excessive due to weather conditions by inputting weather information that produces the external force acting on the light receiving surface and by driving the light receiving surface in such directions as to reduce the external force acting on the light receiving surface based on the inputted weather information. SOLUTION: A drive section 14 drives a light receiving surface 12 so as to track the direction of radiation with sunlight around a gravitational axis and left and right axes orthogonal to the gravity axis. An anemometer 24 provided in the vicinity of the surface 12 outputs a signal according to a wind direction, and outputs an electromotive force according to a wind velocity. Further, a snow coverage meter 26 provided in the vicinity of the surface 12 measures a time interval between the transmission of an emitted ultrasonic wave and its reception, and outputs a signal according to a snow coverage based on the measurement. Outputs from a solar direction sensor 12c, a proximity switch 22, and the meters 24 and 26 are sent to a control unit 18, and the unit 18, e.g. generates a sunlight tracking direction based on these input values. |
