Patent ID: 7477438
Filing Date: 2009-01-13
Classification: G01J

Abstract:
1. An optical imaging system for imaging at least two planes of a light beam spaced apart in the beam direction onto a common target site, comprising: at least one optically imaging element arranged in the beam path of said light beam; said at least one optically imaging element being a collecting primary mirror having a reflecting surface with a defined reflecting surface area; at least two secondary mirrors being arranged downstream of said primary mirror, said at least two secondary mirrors being movable alternately into the beam path of said light beam so as to alternately receive the light beam reflected off the same sized area of the same said reflecting surface of said collecting primary mirror; wherein said secondary mirrors are designed such that one of said at least two secondary mirrors permits imaging of one of said at least two planes of said light beam, and the other of said at least two secondary mirrors permits imaging of the other of said at least two planes of said light beam, onto said target site, respectively; and further wherein the combination of said one secondary mirror with said primary mirror has a different imaging characteristic with respect to magnification or focal length than the combination of said other secondary mirror with said primary mirror.