Patent ID: 7102743

Claim:
A semiconductor wafer inspection apparatus comprising: a rotatable table on which a semiconductor wafer is held by suction; an illuminating device which illuminates at least an edge portion of the semiconductor wafer held on the rotatable table; an imaging device, which is disposed at a same side as the illumination device with respect to a surface of the semiconductor wafer, and which captures an image of the edge portion of the semiconductor wafer by light from a surface of the edge portion when the edge portion is illuminated by the illuminating device; an image processing device which detects at least one of an edge cut line width and a crack on the surface of the edge portion by acquiring the image of the edge portion which is captured by the imaging device; and a display section which displays an image of the edge portion subjected to image processing by the image processing device; wherein the image processing device determines that the semiconductor wafer is defective if the edge cut line width is outside of a predetermined value range, and calculates a position of the defective edge cut line width with respect a position of a notch of the semiconductor wafer.