Imaging device, especially for optical fingerprinting
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United States of America Patent
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Aug 6, 2002
Grant Date -
N/A
app pub date -
Dec 23, 1999
filing date -
Dec 23, 1999
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An optical imaging device such as a fingerprint imager has a prism or another light transmitting element, a light source for illuminating a finger placed on the prism, and a CCD image sensor for receiving a light beam reflected from the finger-contacted surface. A modified optical lens is used to focus and redirect the reflected light beam. The lens has a relatively small reflective coating in the middle of its back surface, the reflective coating constituting an optical iris. The modified lens is effective to partly correct for peripheral aberration, perspective distortion and depth-of-field image distortion of the device and gives rise to a compact design of the device.
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