All-reflective zoom optical imaging system

摘要

An all-reflective zoom optical system is disclosed. The system comprises a plurality of curved relay mirrors successively reflecting electromagnetic radiation received by the system to generate a real image with electromagnetic radiation on a focal surface that is fixed across the zoom range. Further, the entrance aperture also is constant for any zoom position. The curved relay mirrors are movable in relationship to each other in mutually parallel tracks to effect the magnification. The system further includes a primary and secondary mirror for collecting and reflecting incoming electromagnetic radiation to the curved relay mirrors.