PURPOSE: To surely track the sun in any direction by providing sensors for rough adjustment on the upper end surface of a shadow forming body and the bottom surface of a substrate.
CONSTITUTION: The prismatic shadow forming body 2 is provided on the substrate 1 vertically, sensors 3 and 4 for rough adjustments are provided on its upper end surface and the bottom surface of the substrate 1, and sensors 5 - 8 for fine adjustment are provided at four sides of the shadow forming body 2 on the substrate 1. Then when the shadow forming body 2 is irradiated with the sunshine SL in a right slanting direction, the shadow forming body 2 forms a shadow on the sensor 5 to generate a difference between the outputs of the sensors 5 and 6. The signal of the difference is generated and a controller controls the direction of a sun tracking sensor main body so as to eliminate the difference between the outputs of the sensors 5 and 6. Further, even when an output difference is generated between the sensors 7 and 8, the controller controls the direction of the sun tracking sensor main body. Then the control is performed continuously as the sun moves, and the sun is tracked.
ARITA WAHEI
TAKAHASHI NOBUYUKI
