A fingerprint recognizing apparatus includes: a prism, an electroluminescent device secured or adhered on an incident surface of the prism for emitting a uniform light towards a finger-laying surface of the prism with the light beam reflected at the valleys of the fingerprint, a photosensor selected...http://www.google.fr/patents/US5781651?utm_source=gb-gplus-shareBrevet US5781651 - Compact fingerprint recognizing apparatus illuminated with electroluminescent device
Compact fingerprint recognizing apparatus illuminated with ...
