Systems and methods for illuminating a platen are provided. A hybrid illumination system uses both diffusion and collimation to efficiently provide a flat, uniform illumination at a platen. One or more diffusers are disposed between the illumination source array and a collimating lens. An illumination...http://www.google.de/patents/US7271881?utm_source=gb-gplus-sharePatent US7271881 - Systems and methods for illuminating a platen in a print scanner
