Apparatus for matching a fingerprint using a tacky finger platen
First Claim
1. A fingerprint matching apparatus comprising an optical element having a reading surface adapted to receive a finger, a light source for illuminating the optical element, and a sensor for sensing the fingerprint ridge pattern when a finger is placed on the reading surface, wherein at least a portion of the reading surface is sufficiently tacky to grip the fingerprint ridges and maintain contact with the fingerprint ridges to adapt to local variations of ridge height and minor deformities in the fingerprint ridge pattern thereby filling in the shallower portions of the ridges when the finger is placed on the tacky reading surface.
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Accused Products
Abstract
In a fingerprint matching system, a finger platen formed of an optical element having a tacky reading surface for providing an accurate and consistent image of a fingerprint pattern.
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Citations
16 Claims
- 1. A fingerprint matching apparatus comprising an optical element having a reading surface adapted to receive a finger, a light source for illuminating the optical element, and a sensor for sensing the fingerprint ridge pattern when a finger is placed on the reading surface, wherein at least a portion of the reading surface is sufficiently tacky to grip the fingerprint ridges and maintain contact with the fingerprint ridges to adapt to local variations of ridge height and minor deformities in the fingerprint ridge pattern thereby filling in the shallower portions of the ridges when the finger is placed on the tacky reading surface.
- 5. An apparatus for sensing a fingerprint ridge pattern comprising an optical element having a reading surface, a source of illumination for illuminating the optical element, and a means for sensing the illumination reflected within the optical element when a fingerprint ridge pattern is placed on the reading surface, wherein at least a portion of the reading surface is sufficiently tacky to grip the fingerprint ridges and maintain contact with the fingerprint ridges thereby to make optical contact with portions of the fingerprint ridges having local variations in height.
- 9. An apparatus for sensing a fingerprint ridge pattern comprising an optical element having a reading surface for receiving a finger, a light source for illuminating the optical element, and a sensor for sensing optically the fingerprint ridge pattern of a finger placed against the reading surface, wherein the reading surface following curing is sufficiently tacky to grip the fingerprint ridges and maintain contact with the fingerprint ridges thereby to make optical contact with portions of the fingerprint ridges having local variations in height.
Specification