| 摘要 |
PURPOSE:To reduce the number of illuminance measuring elements and correcting circuits by providing a detecting means consisting of thermosensor which measures the temperature of an illuminance measuring element, a means which moves this detecting means, and a means which corrects an illuminance signal with the output signal of the thermosensor. CONSTITUTION:A control system 100 consists of a control part 11, a motor control circuit 12, and a motor driver 13. The motor control circuit gives a command from the control part 11 to the motor driver 13, and the motor driver 13 drives a DC motor 21. A mechanical system 200 consists of the DC motor 21 which slides an illuminance measuring element 3 along a slit light, a photosensor 23 which detects the rotation number of this motor 21, photosensors 24 and 25 for limit detection, and a thermosensor 22. Photosensors 24 and 25 detect limit points of extents of movement of the illuminance measuring element 3 and the thermosensor 22. A correcting circuit 4 uses the output signal of the thermosensor 22, which indicates the temperature of the element 3, to correct the illuminance signal outputted from the element 3. |
