A multiple working range scanner includes a collection mirror which is segmented, with each segment having differing optical properties, such as focal length, optical axis, and so on. Differing segments or combinations of segments deal with reflected light received at differing working ranges, and direct...http://www.google.co.uk/patents/US20020060245?utm_source=gb-gplus-sharePatent US20020060245 - Optical scanner with segmented collection mirror
