A multiplexing optical system capable of processing input information at high speed and with high accuracy and having an easy-to-align simplified arrangement. A parallel-beam generating device (11, 12, 13) generates an approximately parallel light beam. An input image display device has a grating member...http://www.google.de/patents/US6314210?utm_source=gb-gplus-sharePatent US6314210 - Multiplexing optical system
