A scanning imaging apparatus comprises an optical system including a curved polariser/reflector, a rotatable reflector, a polarisation twisting plate, and a receiver array, wherein a convex reflective element is incorporated in the optical path that acts as a sub-reflector that increases the optical...http://www.google.fr/patents/US7443560?utm_source=gb-gplus-shareBrevet US7443560 - Scanning imaging apparatus
