Patent ID: 8107064
Filing Date: 2012-01-31
Classification: G01B,G01N,G01R

Abstract:
1. An inspecting device of a disc wafer having a processing region formed on its surface, said inspecting device of a disc wafer characterized by having a holder rotatable about a predetermined shaft and holding the disc wafer, a rotation drive part making the holder rotate about the shaft, an image capturing means for capturing an image of the outer edge and its neighboring region of the disc wafer rotated by the rotation of the holder, a wafer outer edge position measuring means for measuring a radial direction position of the outer edge of said disc wafer at each of a plurality of rotational angle positions of the disc wafer rotated by rotation of the holder, an edge-to-edge distance measuring means for measuring an edge-to-edge distance between an outer edge of the disc wafer and an edge of the processing region at each of the plurality of rotational angle positions based on the images captured by the image capturing means, and an inspection information generating means for generating predetermined inspection information based on the radial direction position of the outer edge at each of the plurality of rotational angle positions of the disc wafer obtained by the wafer outer edge position measuring means and the edge-to-edge distance at each of the plurality of rotational angle positions obtained by the edge-to-edge distance measuring means.