| 摘要 |
PURPOSE:To enable the accurate detection of a distance over a wide range of receiving quantity of light, by operating range finding information from an integrated value according to a definite integration time renewed and set on the basis of a stored integrated value. CONSTITUTION:Light receiving means 5a, 5b receive reflected light from a range finding object by the light projection of a light projecting means 1 to output two kinds of signals relatively changing in dependence on the distance of the range finding object. The integration means 17 of two kinds of said signals stores the integrated values of the signals integrated within the preceding definite integration time and a lately definite integration time is renewed and set on the basis of said integrated values. An operation means 9 allows the means to perform integrating operation according to the renewed and set definite integration time and range finding information is operated from the obtained integrated values. By this method, the accurate detection of a distance can be performed regardless of the receiving quantity of light inputted from the range finding object. |
