Patent ID: 8102521

Claim:
An inspection system comprising: optics; an object support for mounting an object in a region of an object plane of the optics; a bright-field light source; a dark-field light source; an image detector having a radiation sensitive substrate disposed in a region of an image plane of the optics; and a beam dump; wherein the optics comprise an objective lens, a projection lens, first, second, and third mirrors, and a beam splitter providing an imaging beam path, a bright-field illumination beam path and a dark-field illumination beam path and are arranged: such that the following components are disposed in the imaging beam path in the following order: the object plane, the objective lens, the first mirror, the beam splitter, and the radiation sensitive substrate; such that the following components are disposed in the bright field illumination beam path in the following order: the bright-field light source, the beam splitter, the first mirror, the objective lens, and the object plane; and such that the following components are disposed in the dark field illumination beam path in the following order: the dark field light source, the second mirror, the projection lens, the third mirror, the object plane, and the beam dump; wherein a first plane defined by an optical axis of the imaging beam path between the objective lens and the first mirror and an optical axis of the imaging beam path between the first mirror and the beam splitter is not co-planar with a second plane defined by an optical axis of the dark-field illumination beam path between the second third mirror and the object plane and an optical axis of the dark-field illumination beam path between the object plane and the beam dump.