Optical finger print input device for mobile apparatus
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United States of America Patent
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Jul 22, 2008
Grant Date -
Aug 16, 2007
app pub date -
Sep 14, 2004
filing date -
Mar 10, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical fingerprint image input device for a mobile apparatus includes: a plate-shaped fingerprint contact member; a distortion correcting member for correcting distortions; light sources disposed at both sides of the fingerprint contact member, other than an inclined surface or a back light source in a liquid crystal display element; focusing means disposed at an inclined surface side of the distortion correcting member; and an image sensor. In other words, the fingerprint contact member and the distortion correcting member having respective set-up inclined angles are disposed to discern sweat, water or oil and to correct a trapezoidal distortion which is a disadvantage that occurs when a thin fingerprint contact medium is used, and to form a lens system comprised of a cylindrical lens and a spherical lens for adjustment of a ratio of transversal to longitudinal widths of an image.
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