| 摘要 |
<p>PURPOSE: To securely photodetect light even if there is a high shield in the circumference. CONSTITUTION: On the unmanned carriage 1, a projector photodetector 2 is provided on the top surface of a projector photodetector support 5. A rack 6 is fitted onto the bottom surface of the projector photodetector 2. A pinion 7 meshes with the rack 6 and is rotated by an elevation motor 8. When the intensity of photodetected laser light decreases below a specific value or when height set values previously set by travel areas are changed according to whether or not there are shield bodies in the respective areas, the elevation motor 8 is put in operation to move up and down the projector photodetector 2.</p> |
