| 摘要 |
A device for detecting a defect at an end surface of a glass sheet has an imaging device with at least two CCD cameras for imaging an end surface portion of the glass sheet from outside the end surface, from two directions oblique to front and back surfaces of the glass sheet; a lighting device at least having substantially C-shaped ring lighting that is capable of emitting illumination light in the central axis direction of the ring lighting and has a slit-like cutout section; and an image processing device for processing an image signal obtained by the CCD cameras and determining quality of the end surface portion. The end surface of the glass sheet is movably inserted into the slit section so that the end surface portion is coincide with the center axis of the ring lighting, the end surface is irradiated with illumination light, and the end surface is imaged by the imaging device. When the image signal is processed by the image processing device, the presence or absence of a defect at the end surface is detected.
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