A light-scanning reader equipped with a rotary or oscillatory polyhedral reflector including at least two correlated reflecting surfaces each formed in an angular range of 180.degree. or less to generate a plurality of mutually non-parallel scanning loci. The polyhedral reflector is so disposed as to...http://www.google.es/patents/US4938551?utm_source=gb-gplus-sharePatente US4938551 - Light-scanning reader
