| 摘要 |
PURPOSE:To exclude a complicated circuit which checks the continuity, by using a mechanism that feeds the sheet type material at a constant speed, a 1-dimensional photoelectric conversion scanner that is attached vertically to the feeding direction of the above-mentioned material, and others. CONSTITUTION:A defect detector contains a feeding mechanism that feeds the sheet type material at a constant speed and a 1-dimensional photoelectric conversion scanner 10. The light reflected from a sheet material 6 which is irradiated evenly by a light source 8 is received at the scanner 10. Then the control signal that performs the scan control by means of the output signal of a rotary encoder 2 is produced along with the distance signal to the feeding direction of the material 6. In this case, the defect is detected with the surface signal level of the material 6 used as the reference signal by using a floating binary system. As a result, a complicated circuit required for the continuity is not required. |
