Fingerprint image optical input apparatus
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United States of America Patent
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-
Mar 12, 2002
Grant Date -
Dec 13, 2001
app pub date -
Apr 9, 2001
filing date -
Oct 9, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fingerprint optical input apparatus comprises a contact image sensor for viewing a moving finger and providing a high contrast image. A narrow strip of the fingerprint touching a transparent platen is illuminated by sheet of collimated light normal to or at an oblique angle to the surface. The fingerprint image is viewed at an oblique angle by partially scattered light or by frustrated total internal reflection by a GRIN rod lens array and projected onto a linear array sensor. Various embodiments of the platen provide a compact design by using TIR or mirror reflections of the fingerprint image.
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