A carriage carrying a plurality of scanners passes on a housing underneath an image-bearing master so as to produce three color-component beams that are each reflected through a set of mirrors onto a respective location on an image-receiving electrostatic drum. Each set of mirrors has at least one mirror...http://www.google.fr/patents/US4033688?utm_source=gb-gplus-shareBrevet US4033688 - Color copying apparatus
