Patent ID: 6055055
Filing Date: 2000-04-25
Classification: G01N

Abstract:
An apparatus for inspecting an object having a plane, comprising:a camera for sensing an image of the object, the camera having an optical axis passing through the object normal to the plane of the object;an oblique light source for radiating light on the object obliquely to the plane of the object, the oblique light source having a portion positioned on one side of the optical axis;a reflector positioned on the opposite side of the optical axis relative to the portion of the oblique light source for reflecting light that crosses the optical axis from the oblique light source to the camera, such that a portion of the object interposes between the portion of the oblique light source and the reflector to Image the shape of that object portion on the camera; anda planar datum having a window through which light from the oblique light source passes obliquely to the reflector, the planar datum blocking light from directly passing from the light source to the camera without reflecting by the reflector during imaging.