Patent ID: 9064922
Filing Date: 2015-06-23
Classification: G01N,H01L

Abstract:
1. A substrate inspection apparatus, comprising: a rotator that holds and rotates a substrate having a coating film formed on a surface; a light irradiator that irradiates light to the surface of the substrate; photoelectric converter that receives specularly reflected light from the surface of the substrate and captures an image of a scanning line having at least a length of the radius of the substrate in a main scanning direction parallel to a radial direction of the substrate from a center of rotation of the substrate; and an image processor that generates a two-dimensional image by arranging images captured by the photoelectric converter during one turn of the substrate in a sub scanning direction perpendicular to the main scanning direction and judges whether an edge line of the coating film is good or bad using a judgment band set in parallel to the sub scanning direction for the two-dimensional image, wherein the image processor includes: an edge detector that divides an image included in the judgment band out of the two-dimensional image into a plurality of block images in the sub scanning direction and detects whether or not each block image includes the edge of the coating film; and a good and bad judgment unit that judges whether the edge line of the coating film is good or bad based on the number of the edge-detected block images by the edge detector.