| 摘要 |
PURPOSE:To detect a defect of the drum part of a bottle with high accuracy by radiating a light beam to a drum part of a rotating bottle, detecting a defect point from its transmission video, and deciding the continuous state of a defect scanning line, based on this defect point. CONSTITUTION:A bottle 12 which is an object to be inspected, which flows continuously, while rotating is illuminated by a diffused light source 10, and a video which has passed through a drum part of this bottle 12 is made incident on a primary photoelectric converter 16 through an oscillation lens 14. The lens 14 is moved synchronously with a movement of the bottle 12, and always allows a transmission video to form an image in the center of the converter 16. A defect detecting circuit 24 compares the brightness of plural points separated by a prescribed distance in a detecting scanning line which is set by an inspection gate setting circuit 20 in an inspection area, and detects a defect from its result. A deciding circuit 28 decides whether the detecting scanning line is a defect scanning line or not, based on said defect point. Subsequently, based on a continuous state of the defect scanning line, whether a defect exists in the drum part of the bottle 12 or not is decided.
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