| 摘要 |
PURPOSE:To suppress the generation of a range finding error and to simplify the circuit constitution by selecting and supplying a couple of output signals from a photodetecting element alternately to a common signal processing means through the switching of a switching means. CONSTITUTION:A 1st output signal which is selected by an analog switch 18 between the two output signals from a PSD(semiconductor position detector) 9 as the photodetecting element is processed by a signal processing means consisting of a gain control amplifier 20, etc., first and outputted at 1st range finding data AFD1. This range finding data AFD1 is stored and held in a RAM 28 temporarily by a microcomputer 14 as an arithmetic means. Then the 2nd output signal which is selected by the analog switch 18 is processed similarly by the common signal processing means and inputted as 2nd range finding data AFD2 to the arithmetic means. The arithmetic means performs arithmetic according to those obtained range finding data AFD1 and AFD2 and outputs a range finding signal correlative to a subject distance. |
