| 摘要 |
PROBLEM TO BE SOLVED: To provide a distance measuring apparatus capable of precisely discriminating whether light incident on the distance measuring apparatus is the reflected light from a preceding transport carriage and eliminating erroneous stop or the like of the transport carriage due to erroneous detection. SOLUTION: The distance measuring apparatus in which a distance measurement device including a scan part for scanning modulated measurement light in a plane and a distance calculation unit calculating the distance to a detection object on the basis of time delay between the measurement light scanned by the scan part and reflected light from the detection object is disposed at the front of the transport carriage traveling along a track detects a following distance between the transport carriages on the basis of the reflected light from a retroreflective member disposed at the rear part of the traveling preceding transport carriage by the distance measurement device. The distance measuring apparatus includes a discrimination part discriminating the reflected light from the retroreflective member of the basis of correlation between any two of a plurality of scan angles of the measurement light scanned by the scan part, the distance corresponding to each scan angle calculated by the distance calculation unit, and intensity of reflected light corresponding to each scan angle. COPYRIGHT: (C)2011,JPO&INPIT
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