US 7,403,271 B2Granted

Optical finger print input device for mobile apparatus

AssigneeSecutronix Inc.

InventorsHyun Kim, Young Jin Seo, Jong Woo Ahn, Seung Min Lee, Sa Hyang Hong, Tae Hun Lee, Byung Kee Kwak

Life of this patent

Estimating the term…

Loading patent…

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.

Claims10

Dependent claims

An optical fingerprint input device for a mobile apparatus comprising:

a fingerprint input member made of a thin plate-shaped and light-penetrative material, and formed thereon with an incident surface for receiving fingerprint images and an inclined surface at one side contacting the incident surface;
a distortion correcting member made of a box-shaped and light penetrative material and disposed with an incident surface opposite to the inclined surface of said fingerprint input member and an inclined surface oppositely formed to the incident surface of said distortion correcting member and reversely inclined relative to the inclined surface of said fingerprint input member;
an image-forming unit for forming fingerprint images penetratively reflected from the inclined surface of said distortion correcting member;
and
an image sensor for receiving the fingerprint images formed by said image forming unit to generate a signal corresponding to the input images.

2 more elements

Dependencies are inferred from the claim text.