Patent ID: 7224520
Filing Date: 2007-05-29
Classification: G02B

Abstract:
1. A catadioptric imager comprising: a first group of optical elements optically disposed to receive electromagnetic radiation from a source; a second group of optical elements having at least one optical surface; said second group of optical elements being optically disposed between said first group of optical elements and an image plane; a third group of optical elements having at least one optical surface; said third group of optical elements being substantially centered with respect to said first group of optical elements and optically disposed between the object and said second group of optical elements; a fourth group of optical elements substantially centered with respect to said second group of optical elements; a fifth group of optical elements having positive optical power; said fifth group of optical elements being optically disposed between said fourth group of optical elements and the image plane; said fourth group of optical elements being optically disposed between said third group of optical elements and said fifth group of optical elements.