| 摘要 |
PROBLEM TO BE SOLVED: To simultaneously detect not only black foreign matter but also white foreign matter. SOLUTION: A red color illumination part 2 is provided behind a glass container 3 filled with a liquid, and a blue color illumination part 1 is provided in a forward oblique direction with respect to the glass container 3. The red light of the red color illumination part 2 is transmitted through the glass container 3 and the blue light of the blue color illumination part 1 is reflected from the liquid in the glass container 3. Both lights are separated by a color separation mirror 4, the images of them are picked up by cameras 5 and 6, and foreign matter is further detected by an image processor 7.
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