| 摘要 |
PURPOSE:To accurately detect a defect without being affected by face condition of a conveyance device by a constitution wherein a background face placed on an extending line of a camera view is formed so that a plurality of blocks having different color differences are aligned. CONSTITUTION:A background face 2 between conveyers 3a, 3b that convey a prepreg 4a which is a transparent sheet material 4, is placed on an extending line of filed of view of cameras 6a, 6b, 6c. The background face 2 is formed out of a plurality of blocks 1a, 1b, 1c having different color differences. The blocks are painted in white color, black color and red color, respectively. By the combinations of the colors and the corresponding cameras, each defect is detected in accordance with the target of each combination. That is, it is easy to detect a brown or black obstacle by means of the white block 1a. It is easy to detect a resin stagnation or a string void by means of the black block 1b. A printed red marking is not detected by means of the red block 1c. |
