Patent ID: 8089622

Claim:
A device for evaluating defects in the edge area of a wafer, with a first camera being arranged such that the first camera is opposite to an upper edge area of the wafer; a second camera being arranged such that the second camera is opposite to a front edge area of the wafer; a third camera being arranged such that the third camera is opposite to a lower edge area of the wafer; each camera has a field of view for acquiring an image of the respective area; at least one illumination means being arranges with respect to the first, the second and the third camera so that the first, the second and the third camera are in a bright field arrangement; and the wafer is positionable in the field of view of the respective camera for the acquisition of an image of the defect, wherein at least the first camera and the third camera are arranged on a carrier movable in a radial direction with respect to the wafer, wherein the carrier is positionable with respect to the edge of the wafer such that the first camera is opposite to the upper edge area of the wafer, and the third camera is opposite to the lower edge area of the wafer, and that the second camera is stationary with respect to the front edge area of the wafer.