Patent ID: 8223443
Filing Date: 2012-07-17
Classification: G02B

Abstract:
1. An imaging system comprising: a back-plane reflector having a concave aspherical reflecting surface and an outer diameter that is no greater than a first distance, with an aperture formed in the back-plane reflector, the aperture for admitting light from a field of view to the imaging system, a fore-plane reflector having a concave aspherical reflecting surface and an outer diameter that is no greater than the first distance, with an aperture formed in the fore-plane reflector, the aperture for discharging the light from the imaging system to an image plane, and a central reflector having a convex aspherical reflecting surface for receiving light from the fore-plane reflector and discharging the light from the imaging system through the aperture in the fore-plane reflector, wherein the light admitted to the image system from the field of view reflects twice off the fore-plane reflector, and once each off of both the back-plane reflector and the central reflector.