| 摘要 |
PURPOSE: To direct the photodetection part of a measuring instrument, etc., to the sun at all times. CONSTITUTION: The outputs of four photodetecting elements, constituting a sensor part 12, where the sunshine is made incident through the pinhole of the photodetection window of a sensor storage part 11 are amplified by respective amplifiers 19a-19d. The outputs of the amplifiers 19a-19d are converted by A/D converters 21a-21d into digital signals. A CPU31 judges whether the respective data of the A/D converters 21a-21d are large or small and supplies signals for equalizing the photodetection quantities of the respective photodetecting elements and in which the axis center of the sensor storage part 11 coincides with the axis center of the sunlight to motor control circuits 41A and 41Z. The motor control circuits 41A and 41Z send control signals out to motor driving circuits 51A and 51Z. Motors 61A and 61Z supplied with currents from the motor driving circuits 51A and 51Z drive the support base of the measuring instrument, etc., fitted with the sensor storage part 11 in the azimuth angle direction and the zenith direction through reduction gears 71A and 71Z. |
