A fingerprint input apparatus includes a prism, a light source, a pinhole, and an imaging plane. The prism is placed such that a surface in one direction serves as a fingerprint collection surface. The light source irradiates light on the fingerprint collection surface through the prism. The pinhole...http://www.google.ca/patents/US6185319?utm_source=gb-gplus-sharePatent US6185319 - Fingerprint input apparatus
