Patent ID: 8648905

Claim:
A transparent body inspecting device comprising: at least one light source to apply light to a transparent body; a camera to capture an image of the transparent body, the camera having a depth of field being smaller than a height of the transparent body; a driving device physically coupled to the camera to move the camera in a direction in which the camera is brought close to the transparent body and in a direction in which the camera is brought away from the transparent body; and a defect determining unit communicatively coupled to the camera such that the defect determining unit receives image data of the captured image from said camera to determine existence or nonexistence of a defect in the transparent body based on whether or not brightness of pixels in the image captured by the camera is nonuniform, wherein: the camera carries out image capture more than once while moving in the direction in which the camera is brought close to the transparent body or in the direction in which the camera is brought away from the transparent body; when the brightness of pixels in the image captured by the camera is nonuniform, the defect determining unit determines that a defect exists within the depth of field at the time of capture of this image; and when defective capture images having nonuniform brightness of pixels are continuous in a plurality of the images captured by the camera while the camera is moved in one direction, the defect determining unit determines that a defect exists within the depth of field at the time of capture of the defective capture image having the highest contrast among the defective capture images.