Patent ID: 9182592
Filing Date: 2015-11-10
Classification: G01N,G02B

Abstract:
1. A defect inspection apparatus, comprising: illuminator which illuminates an inspection object substrate; detection optical unit including an optical filtering device which blocks scattered light from a portion of the inspection object substrate which is not desired to be detected as a defect, and detects scattered light from the portion of the inspection object substrate which is not blocked by the optical filtering device; signal processing unit which processes a signal obtained by the detection of the scattered light by the detection optical unit to detect a defect of the inspection object substrate; and outputting unit which outputs information of the defect detected by the signal processing unit, wherein, the optical filtering device of the defect inspection apparatus including: a shutter array which has shutter patterns formed in a two-dimensionally arrayed relationship on an optically opaque thin film produced on a SOI wafer and working electrodes formed on remaining portion of the SOI wafer which is removed at portions lower sides of the shutter patterns to form perforation portions; a glass substrate having electrode patterns formed on the surface thereof and having the shutter array mounted thereon; and a power supply section for supplying electric power to the electrode patterns formed on the glass substrate and the working electrodes of the SOI wafer, wherein the electric power to be supplied from the power supply section to the electrode patterns and the working electrodes being controlled to cause the shutter patterns formed in the two-dimensionally arrayed relationship to carry out opening and closing movements with respect to the perforation portions.