Patent ID: 7289215

Claim:
A device comprising: an imaging system that generates image signals of the area on a wafer within a field of view of the imaging system; a positioning system providing relative lateral movement between the imaging system and the wafer and providing relative rotational movement between the imaging system and the wafer, wherein the combined relative lateral movement and relative rotational movement between the imaging system and the wafer permits positioning of any desired area on the wafer within the field of view of the imaging system; and a control system coupled to the positioning system and the imaging system, the control system receiving the image signals from the imaging system, the control system processing the image signals and generating corrected output signals that compensate for the relative rotational movement between the imaging system and the wafer so that an image produced in response to the corrected output signals appears with the orientation of features on the wafer within the field of view unaffected by the relative rotational movement between the imaging system and the wafer.