A light guiding plate is manufactured with accuracy and at low cost. This invention comprises a cylindrical roller, which has a heater built-in, rotating while fixing a stamper having a dot pattern formed on its surface, substrate fixing means for reciprocating along a lower portion of the cylindrical...http://www.google.ca/patents/US7094290?utm_source=gb-gplus-sharePatent US7094290 - Light guiding plate manufacturing apparatus and light guiding plate manufacturing method
