JPS6479609A - Apparatus for automatically tracking sun - Google Patents

Abstract

PURPOSE:To enhance not only the detection sensitivity to the movement of the sun but also the tracking capacity of the sun, by providing a light blocking body in front of an optical sensor in the vertical direction thereof to always allow the optical sensor to enter the shade of the light blocking body. CONSTITUTION:The title apparatus consists of four optical sensors 45 and the light blocking body 44 provided in front of said sensors 45 in the vertical direction thereof and the light blocking body 44 is formed into such a shape that the fronts of the sensors 45 in the vertical direction and the insides of the arrangement places of the sensors 45 are blocked from light. The quantity of the light received by the sensors 45 escaped from the shade part by the light blocking body is increased by the change of the light blocking position moving by the movement of the sun and the quantities of light received by the sensors become different and the positional change of the sun can be detected and the direction of a sun automatic tracking sensor 22 is changed to the direction of the sensor increased in the quantity of receiving light. By allowing all of the sensors 45 to enter the shade part by the light blocking body 44, the quantities of the light received by the sensors become equal and the direction to the sun is returned to the vertical direction to make it possible to automatically track the sun. Therefore, illuminance difference to each of the sensors can be increased and the movement detection sensitivity of the sun can be enhanced and the tracking accuracy of the sun can be enhanced.