Patent ID: 7602483
Filing Date: 2009-10-13
Classification: G01N,G02B

Abstract:
1. Illumination device for dark-field illumination for an optical testing device for scanning an object with a light source for dark-field illumination and a reflector, wherein the reflector has in cross-section the form of a segment of an ellipse, and the illumination device is arranged with a first focal point (F 1 ) of the ellipse on the surface of the object, and the light source is located at a point which results from reflection of the second focal point (F 2 ) of the ellipse on the surface of the object, wherein the reflector is in the form of an elongated channel for scanning a line on the object, wherein the light source for dark-field illumination is located at the apex of the reflector, the illumination device further comprising a light source for bright-field illumination which is offset relative to the light source for dark-field illumination.