Scaleable, compact, high resolution optical fingerprint reader

A fingerprint reader for acquiring a fingerprint image has a platen with a micro prism sheet on its underside. An arrangement of fold mirrors is used to receive light from the platen and fold the optical path twice before reaching the imagers. The reader has multiple imagers, each imager having at l...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	MCFADDEN MICHAEL J, MITCHELL JOSEPH N
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING COMPUTING COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY HANDLING RECORD CARRIERS PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS
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Beschreibung
Zusammenfassung:	A fingerprint reader for acquiring a fingerprint image has a platen with a micro prism sheet on its underside. An arrangement of fold mirrors is used to receive light from the platen and fold the optical path twice before reaching the imagers. The reader has multiple imagers, each imager having at least an imaging lens and an image sensor. Each imager is configured so that the image plane of the image sensor is tilted relative to the optical axis of the imaging lens, such that keystone distortion in the fingerprint image is corrected.