| 摘要 |
PURPOSE:To detect the position of an object to be detected with an excellent precision even on a specific condition by arranging two photoelectric transducers at an interval one-dimensionally to detect the position with a slight change of the detection precision even if the size of the object to be detected is changed. CONSTITUTION:The image of an object 15 to be detected which is illuminated with an illuminating device 14 is formed onto two photoelectric transducers 19a and 19b, which are arranged at an interval one-dimensionally, by an image forming lens 16. The detection signal of brightness of the image is inputted to a controller 17, and the image is moved in the arrangement direction of photoelectric transducers 19a and 19b by a scanning signal from the output of the controller 17. On condition that an interval (a) satisfies a<2d and a/2+d<D< a+2d, the position derection precision is improved. Since two photoelectric transducers are arranged at an interval one-dimensionally, the position of the object to be detected is detected with a slight change of detection precision even if the size of the object is changed. On a specific condition, the position of the object to be detected is detected with an excellent detection precision. |
