An optical guide (10, 40, 50, 60) for horizontally aligning two vertically stacked images generated by one or two SLMs. The optical guide has a channel separator (10a) that directs both images along two different paths. A pair of aligning reflectors (10b and 10c) on each path vertically shift the images...http://www.google.es/patents/US5646782?utm_source=gb-gplus-sharePatente US5646782 - Optical guide for increasing printer image width
