A card having retroreflective bar codes is comprised of a card substrate on which there are provided a first information recording portion formed of a retroreflective material portion of a predetermined pattern and a second information recording portion which can be read out from a nearby place. Also,...http://www.google.de/patents/US5237164?utm_source=gb-gplus-sharePatent US5237164 - Card having retroreflective bar codes and a magnetic stripe
