Patent ID: 9025854
Filing Date: 2015-05-05
Classification: G01N,G06T,H01L,H04N

Abstract:
1. A wafer defect inspection apparatus, comprising: a wafer mount configured to mount a wafer that is an inspection target; an irradiator configured to irradiate the wafer with an infrared light; an imager configured to image the wafer that has been irradiated with the infrared light; a reference moving average gray level calculator configured to calculate a gray level that has been obtained by averaging gray levels of a plurality of picture elements in the a predetermined range including an inspection target picture element in a plurality of picture elements that are arranged in the a predetermined line direction as a reference moving average gray level of the inspection target picture element for each of the inspection target picture elements in a region that is an inspection target of the wafer in an image of the wafer that has been imaged by the imager; a differential value calculator configured to calculate a differential value between the reference moving average gray level of the inspection target picture element and a gray level of the inspection target picture element for each of the inspection target picture elements; a defect candidate picture element judger configured to judge whether each of the inspection target picture elements is a defect candidate picture element by comparing the differential value for each of the inspection target picture elements with the a predetermined threshold value; and an inspector configured to inspect a defect of the wafer based on the defect candidate picture element.