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Optical fingerprint identifier capable of identifying living body finger

A fingerprint collection device, fingerprint collection technology, applied in the direction of character and pattern recognition, instruments, measuring devices, etc., can solve the problem of being unable to distinguish living fingers from living fingers, etc., to prevent the use of false fingerprints, good light transmission, reduce effect of distance

Inactive Publication Date: 2011-01-19
CHENGDU FINCHOS ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This area indicates that the capacitive sensor has a certain probability of being unable to distinguish between a live finger and a live finger wearing a fake fingerprint cover

Method used

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  • Optical fingerprint identifier capable of identifying living body finger
  • Optical fingerprint identifier capable of identifying living body finger
  • Optical fingerprint identifier capable of identifying living body finger

Examples

Experimental program
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Embodiment Construction

[0042] The present invention is further described below by embodiment in conjunction with accompanying drawing:

[0043] Such as figure 1 As shown, this embodiment provides an optical fingerprint collection device capable of identifying living fingers, which is composed of a fingerprint collection module 1 and a capacitive living finger detection module 2 . The fingerprint collection module 1 includes a housing 11 , a collection prism 12 , a light source 13 , a lens group 14 , and a semiconductor sensor imaging array 15 . The light source 13 is connected with the incident surface of the collection prism 12, and the light source 13 is connected with the host; the center of the lens group 14 coincides with the optical axis of the optical path, and the output signal of the semiconductor sensor imaging array 15 is connected with the host, and the semiconductor sensor is a CMOS sensor or CCD sensor. Such as figure 2 As shown, the capacitive living finger detection module 2 inc...

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PUM

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Abstract

The invention provides an optical fingerprint identifier capable of identifying living body finger, comprising a fingerprint identification module and a capacitance type living body finger detection module; wherein the capacitance type living body finger detection module comprises an induction electrode and a capacitance measuring circuit, the induction electrode is arranged on an identification face of an identification prism, the bottom layer thereof is a transparent conductive layer and is connected with the identification prism, and the surface layer thereof is a transparent insulation layer and is contacted with a finger. In the invention, the induction electrode is arranged on the identification face, the transparent insulation layer thereof can be directly contacted by a finger, the distance between a living body finger and the induction electrode is reduced, and the living body finger can be effectively identified according to the coupling capacitance measured by the capacitance measuring circuit, thus preventing use of fake fingerprint.

Description

technical field [0001] The invention relates to the field of optical fingerprint collectors, in particular to an optical fingerprint collector capable of identifying living fingers. Background technique [0002] The optical fingerprint collector is a fingerprint collection device widely used in existing fingerprint recognition systems. Based on the principle of optical imaging, it collects and images the surface texture of the finger through an optical sensor, and then sends the fingerprint image to the host for processing. However, the emergence of some false fingerprints made of rubber, gelatin, silica gel and other materials has greatly threatened the security and reliability of the fingerprint recognition system based on optical fingerprint collectors. Fake fingers with the same fingerprint texture as the legitimate user's, including solid-core fake fingers and fingerprint sleeves. Using the optical imaging of the optical fingerprint collector, there is no difference be...

Claims

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Application Information

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IPC IPC(8): G06K9/20G01R27/26
Inventor 盛旭明李扬渊
Owner CHENGDU FINCHOS ELECTRONICS
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