High contrast, low distortion optical acquisition system for image capturing
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United States of America Patent
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Jul 12, 2005
Issued Date -
N/A
app pub date -
Mar 27, 2002
filing date -
Nov 12, 1998
priority date (Note) -
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Abstract
Disclosed is an apparatus for forming a high contrast image of a patterned object, such as a fingerprint, including a first lens having a light receiving surface and a viewing surface and a second lens adjacent to the viewing surface of the first lens. A light source projects incident light into the first lens between the viewing surface and imaging surface such that at least a portion of the incident light undergoes total internal reflection. In this way, an image of the patterned object is generated by substantially all scattered light from the imaging surface.
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