| 摘要 |
<p>PURPOSE:To improve detecting accuracy of the titled detector by detecting the form inferiority of an edge of material to be detected such as a strip. CONSTITUTION:When there is the form inferiority at the edge of the material 1 to be detected, it is detected by a photodetection position detecting circuit 14 and a detected signal is compared with the predetermined upper limit position ho and lower limit position lo with deciding circuits 15 and 16, and a form inferiority signal is outputted. Further, the number of photodetecting element on which a scanning reflected beam is made incident is outputted from a counting circuit 17 and when the number is larger than a predeterminded number (n) or zero, the form inferiority signals are outputted from deciding circuits 18 and 19. These form inferiority signals are sent to a selecting circuit 25 and further, sent to a form inferiority leading edge detecting circuit 26 and a sample and hold circuit 28, and the form inferiority width is outputted.</p> |
