A non-contact type data symbol reader is provided which includes a light projecting system for projecting an optical image defining an area capable of being read onto a readout surface. When an infocus image is formed on the readout surface by the light projecting system, the data symbol reader is being...http://www.google.de/patents/US6160925?utm_source=gb-gplus-sharePatent US6160925 - Data symbol reader having an optical system
