Patent ID: 8879821
Filing Date: 2014-11-04
Classification: G01N

Abstract:
1. A defect inspection system comprising: an optical system configured to irradiate an object to be inspected with light; a detection lens configured to image reflected and scattered light from the object to be inspected; a spatial filter which is disposed on a spatial frequency plane of the detection lens, the spatial filter being configured to selectively transmit diffracted light; an image sensor which is disposed on an image plane of the detection lens, the image sensor being configured to photoelectrically convert the image of the reflected and scattered light; an image processing section which is configured to subject the image captured by the image sensor to comparison processing to detect a foreign matter or a pattern defect on the object to be inspected; an observation optical system which is capable of substantially concurrently observing the image plane of the detection lens and a spatial filter plane corresponding to the image plane; and a light shielding condition setting system which is provided with a spatial filter setting screen, the spatial filter setting screen being capable of substantially concurrently displaying an image of the surface of the object to be inspected and an image of a spatial filter plane corresponding to the image, the light shielding condition setting system being configured to set light shielding conditions of the spatial filter.