| 摘要 |
PROBLEM TO BE SOLVED: To prevent a stain stuck to the surface of a transparent plate-like body from being detected as a defect in a method for detecting the defect such as a scar during the manufacture or secondary machining of the transparent plate-like body such as a plate glass or a transparent plastic sheet by illuminating the transparent plate-like body with scattered light. SOLUTION: Scattered light irradiates the transparent plate-like body in a band shape with a luminaire (a) illuminated at an angle nearly perpendicular to the face of the transparent plate-like body and a luminaire b illuminated at an angle nearly parallel with it. The transparent plate-like body is photographed by a CCD(charge coupled device) camera arranged on the opposite side to the luminaire (a) against the transparent plate-like body, and the defect is detected by using an image obtained by the luminaire (a) and an image obtained by the luminaire b.
|
