Patent ID: 7446864
Filing Date: 2008-11-04
Classification: G01N,G06K,G06T

Abstract:
1. A defect inspection system for inspecting whether a defect is generated or not on a surface of an object to be inspected which is formed of a predetermined material, comprising: a first illuminating device for illuminating the object to be inspected from a predetermined direction; a second illuminating device for illuminating the object from an oblique direction with respect to an optical axis of the imaging device; an imaging device arranged so as to receive a light from the object under an illumination and to thereby generate a color image; a control device for controlling illumination operations of the first and second illuminating devices and operating the imaging device under illuminations of the first and second illuminating devices; a detecting device for detecting an irregular defect and a color defect on a surface of the object using a color image generated by the imaging device controlled by the controlling device; and an output device for outputting a result detected by the detecting device, wherein the first and second illuminating devices each comprise three kinds of light sources which emit colors R, G and B, respectively, the control device is configured to light any one of the three kinds of light sources in the first illuminating device and light one or two kinds of light sources which are not lighted in the first illuminating device, in the second illuminating device; and wherein the detecting device is configured to cut the color image generated by the imaging device into an image having a color corresponding to the light source lighted in the first illuminating device, and an image having a color corresponding to the light source lighted in the second illuminating device, and the presence or absence of the irregular defect is configured to be detected using the former image while the presence or absence of the color defect is configured to be detected using the latter image.