| 摘要 |
PROBLEM TO BE SOLVED: To provide a range finder which can measure distance with high accuracy using a simple configuration, utilizing a single light source and a single light receiving device. SOLUTION: The range finder comprises a light source drive signal generator 11 which can change frequency; a light source 12; a light-receiving element 13; a process operation circuit which calculates the distance to an object, corresponding to a round trip period from an acquired overlap status by acquiring the overlap status by a gap corresponding to the round-trip period with a periodic width of a projected light and the periodic width of a received reflected light. The process operation circuit comprises a current voltage transducer 14; an OR circuit 15 which inputs a driving signal from the light source drive signal generator 11 and a voltage signal from the current voltage transducer 14 and outputs a logical sum; a low-pass filter circuit 16 smoothing in time the logical sum output from the OR circuit 15; an A/D converter 17 which digitizes the output; an arithmetic circuit 18 which calculates the distance between the light source 12 and the object from an amplitude of the logical sum that is smoothed in time. COPYRIGHT: (C)2005,JPO&NCIPI |
