Compact optical fingerprint sensor and method
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United States of America Patent
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Jun 15, 2004
Grant Date -
N/A
app pub date -
Mar 14, 2002
filing date -
Mar 14, 2002
priority date (Note) -
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Abstract
For use in capturing a fingerprint image, an optical fingerprint sensor. In one embodiment of the present invention, the optical fingerprint sensor includes: (1) a light source on a PCB assembly, (2) a diffuser that receives light from the light source, (3) a right angle prism that receives light from the diffuser, (4) a collimating lens that receives light from the prism, (5) a first mirror that receives light from the collimating lens, (6) a second mirror that receives light from the first mirror, (7) a third mirror that receives light from the second mirror, (8) an imaging lens that receives light from the third mirror, and (9) an image sensor on the same PCB assembly as the light source that receives light from the imaging lens.
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