A portable optical data reader for optically sensing and decoding data, comprising a carrier oscillator for producing a carrier signal at a predetermined frequency, an optical emitter electrically connected to the carrier oscillator for emitting optical radiation in an optical path to an optical data...http://www.google.fr/patents/US5281800?utm_source=gb-gplus-shareBrevet US5281800 - Method and apparatus for low power optical sensing and decoding of data
Method and apparatus for low power optical sensing and decoding of data
