Apparatus for producing fingerprint images which are substantially free of artifacts attributable to moisture on the finger being imaged
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United States of America Patent
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May 16, 1995
Grant Date -
N/A
app pub date -
Sep 10, 1993
filing date -
Sep 10, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus for imaging a finger so as to produce a fingerprint image free of artifacts created by moisture on the finger. An optical platen having a surface for receiving the finger to be imaged is illuminated by a light source. A light detector is provided for receiving light from the platen surface which is internally reflected at the surface. A fingerprint image is formed by light which is internally reflected at the regions intermediate the finger ridges and absorbed/dispersed where the ridges contact the surface, The observation angle of the detector is sufficiently large so that moisture on a person's fingers does not affect the light which is internally reflected at the surface and detected. The resultant fingerprint image is free of artifacts attributable to moisture.
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