Patent ID: 8094296

Claim:
A device for optical inspection of open surfaces of an object from at least two different viewing directions, the device comprising: an illumination source for illuminating the open surfaces of the object, a sensor for detecting the light intensity reflected by different locations of the open surfaces of the object and for converting it into electric form, the sensor in the device comprising at least a first telecentric imaging unit having an optical axis; and an angle mirror and auxiliary mirrors within an imaging area of the telecentric imaging unit, between the telecentric imaging unit and the object; the device configured so that the object is positioned between the arms of the angle mirror the telecentric imaging unit is directed towards a combination of the object and the angle mirror, and said auxiliary mirrors are oriented and placed at intervals from said telecentric imaging unit that differences of imaging distances of light beams between the viewing directions from the surfaces of the object to the telecentric imaging unit are compensated with respect to imaging distance lengths as the light beams pass via said auxiliary mirrors.