Patent ID: 7894053
Filing Date: 2011-02-22
Classification: G01N

Abstract:
1. An inspection apparatus comprising: a stage allowing an inspection subject to be mounted thereonto; an illumination unit for emitting diffused light to the inspection subject; an imaging unit disposed to face the illumination unit with the inspection subject interposed therebetween, for taking the diffused light that is emitted from the illumination unit and is transmitted through the inspection subject; a first prism sheet disposed between the inspection subject and the illumination unit and having a first prism surface with a plurality of prisms aligned in a strip pattern to face the illumination unit; a second prism sheet disposed between the illumination unit and the first prism sheet and having a second prism surface with a plurality of prisms aligned in a stripe pattern to face the first prism surface; and a processing unit for inspecting the inspection subject based on a resulting image that is taken by the imaging unit.