| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical range finder capable of selecting an optimal range finding method and improving range finding accuracy. <P>SOLUTION: An optical range finder comprises: a first range finding unit 6 that measures duration from lighting time to light-receiving time of an optical pulse, setting a zero-cross point of a signal after filtering a light-receiving pulse generated by receiving a reflection pulse as light-receiving time of the reflection pulse, so as to calculate a distance to a range finding object 1 based on the measured duration; a second range finding unit 7 that measures duration from lighting time to light-receiving time of an optical pulse, setting a point when a level of the light-receiving pulse generated by receiving a reflection pulse reaches a prescribed threshold value as light-receiving time reflection pulse, so as to calculate a distance to the range finding object 1 based on the measured duration; and a selection unit 8 that compares the calculated distance of the first range finding unit 6 and the calculated distance of the second range finding unit 7 and selects a smaller one of the calculated distances as the distance to the range finding object 1. <P>COPYRIGHT: (C)2012,JPO&INPIT |
