Corrective optical component
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United States of America Patent
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Apr 16, 2002
Grant Date -
N/A
app pub date -
Mar 15, 1999
filing date -
Mar 15, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical imaging device such as a fingerprint imager is disclosed that has an optical modification to reduce perspective distortion in a read image. The optical modification is a contoured lens, a contoured platen recess, a contoured output port, or a contoured reflective surface that compensates for perspective distortion. The optical modification is provided by a complex optical surface and is distinct for a uniformly planar, spherical or cylindrical lens. In addition, a method for determining a perspective distortion correction is disclosed.
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