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Emerald Group Publishing Limited
Copyright © 2001, MCB UP Limited
Keywords: Fingerprints, Sensors
Applicant: Sagem (FR)Patent number: US6128399Publication date: 3 October 2000Title: Fingerprint sensor device
The invention provides a fingerprint sensor device comprising: a thin flat transparent support having an outside face for receiving the end of a finger and carrying on an inside face a two-dimensional matrix of photosensitive elements which are distributed at a regular pitch of not more than 90m and which are separated by strip-forming transparent gaps that are generally of a width that is smaller than the width of the photosensitive elements; a substrate whose inside face, facing the support, carries light sources for directing a light beam through the support via the gaps of the support and substantially orthogonally to said outside face; and means for lighting said sources and reading the photosensitive elements, which are protected against the light coming from the sources so as to deliver an output signal only in response to light that has been back-scattered by the furrows towards the outside face of the support.