| 摘要 |
PROBLEM TO BE SOLVED: To detect the defect of a prism by taking in an image at a time without performing focus scanning every take-in of the image of the prism. SOLUTION: This prism defect detecting device detects the defect of the tested prism 3 by making light from a light source 1 enter the tested prism 3 and processing the light emitted from the tested prism 3. The device is provided with a diaphragm mechanism 2 disposed between the light source 1 and the tested prism 3 to control the quantity of light, an image pickup means having an image pickup element for converting the image of the tested prism 3 into an electric signal, and an image processing means 10 for image-processing the output of the image pickup means and judging whether stripe, bubbles and foreign matters exist in the tested prism 3.
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