Optical finger print input device for mobile apparatus

Details Optical finger print input device for mobile apparatus Optical finger print input device for mobile apparatus

2008-07-22

2008-07-22

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

Document pattern analysis or verification

Reexamination Certificate

active

10591853

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.

REFERENCES:
patent: 5109427 (1992-04-01), Yang
patent: 5892599 (1999-04-01), Bahuguna
patent: 01-145642 (1989-06-01), None
patent: 05-006423 (1993-01-01), None
patent: 1020040042727 (2004-05-01), None

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