CN101706869A - Living fingerprint capturer - Google Patents

Abstract

The invention relates to a living fingerprint capturer comprising an optical fingerprint imaging module and a fingerprint signal processing module, wherein the optical fingerprint imaging module comprises a light source, a prism, an imaging objective lens and an image sensor module which are arranged along an optical path; the image sensor module comprises an image sensor; the prism is a pentaprism comprising a sampling surface and an illuminating surface which are mutually parallel and over against as well as an imaging surface opposite to the imaging objective lens, and the rest surfaces of the pentaprism are all coated with shading layers; the light source is arranged below the illuminating surface of the pentaprism; and a diffusion membrane is arranged between the illuminating surface of the pentaprism and the light source. The invention has the advantages of good optical imaging quality, low false alarm rate, overall automatic induction control, and the like.

Description

Living fingerprint capturer

Technical field

The present invention relates to a kind of biological identification technology, specifically be meant a kind of living fingerprint capturer.

Background technology

Fingerprint recognition is according to the different living body finger print biological characteristic of individual, carry out a kind of bio-identification mode of identity validation and checking, and fingerprint collecting exactly is exactly the core place of this bio-identification mode, fingerprint collecting is the fingerprint imaging process in process in essence, its principle is that to utilize be different according to geometrical property, physical features and the biological characteristic in ridge and valley, plot fingerprint image with the value that obtains different feedback signals, then fingerprint image is being compared, to determine whether the being validated user fingerprint, reached the purpose of security identification.

More common a kind of mode is to adopt the optically detecting imaging method in the current fingerprint collecting, it is delivered to fingerprint optical information by prism and carries out the photosignal conversion on the photoelectric sensor, in conjunction with fingerprint algorithm the fingerprint digital signal is carried out fingerprint recognition by processor then.

But there is following shortcoming in existing commercially available fingerprint recognition product, and main performance has:

(1), light path design is unreasonable, the fingerprint quality of optical imaging is relatively poor, causes the validated user fingerprint to be difficult to by security identification, makes troubles for normal use of user;

(2), in design, for reducing the collecting device energy consumption, when not having the finger contact, fingerprint collecting equipment should be in dormant state, and the finger near the time collecting device open automatically, but finger dormancy of the nothing of traditional design fingerprint collecting equipment and finger are poor near the comparatively complexity or the induction sensitivity of the induction control gear of opening automatically, usually need human finger expressly just can make the fingerprint collecting device start near induction point, fail to realize comprehensive automatic induction control, the commercially available fingerprint collecting equipment of other needs the user to open to press to release the button and could start, automaticity is low, it is not convenient to operate, especially running into some needs the big occasion of fingerprint collecting recognition data amount, and shift knob wastes the precious time repeatedly.

Summary of the invention

The objective of the invention is in order to overcome the shortcoming and defect that prior art exists, and provide a kind of fingerprint collecting quality of optical imaging good, rate of false alarm is low, and can realize the living fingerprint capturer that comprehensive automatic induction is controlled.

For achieving the above object, technical scheme of the present invention is, include the optical finger print image-forming module, the fingerprint signal processing module, described optical finger print image-forming module includes the light source that is provided with according to light path, prism, image-forming objective lens, image sensor module, this image sensor module includes imageing sensor, described prism is a pentaprism, this pentaprism include be parallel to each other over against sampling face and transparent surface and the imaging surface relative with image-forming objective lens, and be coated with light shield layer on its lap of this pentaprism, described light source is arranged at the transparent surface below of pentaprism, and be provided with diffusion barrier between the transparent surface of this pentaprism and the light source. by this setting, utilize the total reflection principle of pentaprism, formed fingerprint is looked like be the bright image under the dark background, increased the sharpness of imaging, and can offset residual trace on the sampling face of pentaprism to the interference of fingerprint imaging, in addition, between light source and transparent surface, diffusion barrier is set, the light that makes light source send is radiated on the sampling face equably, avoid because of light intensity difference everywhere on the sampling face, and tangible dark space or clear zone appear in the fingerprint pattern that causes imaging, cause information in fingerprint fully not discerned conversion by imageing sensor, the degree of accuracy and the sharpness of fingerprint collecting have been improved, acquisition quality of the present invention and recognition efficiency have greatly been improved, in addition, remove sampling face on the pentaprism, transparent surface, other faces outside the imaging surface all scribble light shield layer, can avoid the veiling glare in the external environment condition to enter into the imaging interference that produces in the pentaprism, improve the sharpness and the quality of collection imaging of the present invention.

Further setting also includes the wireless induction wake module, this wireless induction wake-up mechanism includes the live body induction chip and is connected in wireless induction antenna on the live body induction chip, this wireless induction antenna is the rectangular conductive metal frame adaptive with the sampling face size of pentaprism, and this rectangular conductive metal frame is arranged at week of sampling face of pentaprism along last.By this setting, adopt the rectangular conductive metal framework be located at pentaprism sampling face around, therefore when human finger is pressed sampling face at pentaprism, naturally, finger just drops in the rectangular conductive metal frame, therefore, the wireless induction antenna can all can be sensed finger on the four direction inwardly, handle thereby induced signal is passed to the live body induction chip, wake light source of the present invention, image sensor module and fingerprint signal processing module then up and start, carry out fingerprint collecting and identification.

The data output end that further setting is described image sensor module is connected on the signal input part of fingerprint signal processing module by row's pin.By row's battle array data are transmitted, not only made the data output end of image sensor module and the signal input part of fingerprint signal processing module be connected closely, reduce accident and make mistakes.

Further being provided with is that described imageing sensor is a cmos image sensor.

Further being provided with is that described light source is a high-brightness LED lamp.By this setting, make light source of the present invention have brightness height, long service life, the advantage of low energy consumption of LED lamp

Description of drawings

Fig. 1 specific embodiment of the invention partial structurtes exploded view;

Fig. 2 specific embodiment of the invention functional-block diagram;

Fig. 3 specific embodiment of the invention wireless induction wake module circuit diagram;

Fig. 4 specific embodiment of the invention image sensor module circuit diagram;

Fig. 5 specific embodiment of the invention fingerprint signal processing module circuit diagram

Fig. 6 specific embodiment of the invention pentaprism perspective view.

Embodiment

Below by embodiment the present invention is carried out concrete description; only be used for the present invention is further specified; can not be interpreted as the qualification to protection domain of the present invention, the technician in this field can make some nonessential improvement and adjustment to the present invention according to the content of foregoing invention.

The specific embodiment of the present invention shown in Fig. 1-2, include optical finger print image-formingmodule 1, fingerprintsignal processing module 2, this fingerprintsignal processing module 2 of the present invention adopts the DSP digital signal processor to carry out in conjunction with fingerprint algorithm the processing and identification of fingerprint signal, as shown in Figure 5, described optical finger print image-formingmodule 1 includes thelight source 11 that is provided with according to light path,prism 12, image-formingobjective lens 13,image sensor module 14, thislight source 11 of present embodiment is a high-brightness LED lamp, has the brightness height, long service life, advantage of low energy consumption, describedimage sensor module 14 includesimageing sensor 141, describedprism 12 is apentaprism 12, thispentaprism 12 include be parallel to each other over againstsampling face 121 andtransparent surface 122 and theimaging surface 123 relative with image-forming objective lens, and be coated withlight shield layer 124 on its lap of this pentaprism, describedlight source 11 is arranged attransparent surface 122 belows ofpentaprism 12, and is provided withdiffusion barrier 15 between thetransparent surface 122 of this pentaprism and the light source 11.The describedimageing sensor 141 of present embodiment is acmos image sensor 141, and theseimage sensor module 14 circuit diagrams as shown in Figure 4.

The present invention utilizes the total reflection principle of pentaprism, formed fingerprint is looked like be the bright image under the dark background, increased the sharpness of imaging, and can offset residual trace on thesampling face 121 of pentaprism to the interference of fingerprint imaging, in addition, betweenlight source 11 andtransparent surface 122,diffusion barrier 15 is set, the light that makeslight source 11 send is radiated on thesampling face 121 equably, avoid because of light intensity difference everywhere on thesampling face 121, and tangible dark space or clear zone appear in the fingerprint pattern that causes imaging, cause information in fingerprint fully not discerned conversion by imageing sensor, the degree of accuracy and the sharpness of fingerprint collecting have been improved, acquisition quality of the present invention and recognition efficiency have greatly been improved, in addition, removesampling face 121 on thepentaprism 12,transparent surface 122, other faces outside theimaging surface 123 all scribblelight shield layer 124, can avoid the veiling glare in the external environment condition to enter into the imaging interference that produces in the pentaprism, have improved the sharpness and the quality of collection imaging of the present invention.

In addition, as shown in Figure 3, present embodiment includes wirelessinduction wake module 3, this wireless induction wake-up mechanism 3 includes livebody induction chip 31 and is connected inwireless induction antenna 32 on the live body induction chip, thiswireless induction antenna 32 is the rectangularconductive metal frame 32 adaptive withsampling face 121 sizes ofpentaprism 12, this rectangularconductive metal frame 32 be arranged at pentaprism sampling face around.It is the live body induction chip of ADA03 that the described live body induction chip ofpresent embodiment 31 adopts models, and described rectangularconductive metal frame 32 can adopt high-qualityly to be mixed the one-shot forming of phosphor-copper material and make.

The present invention adopt rectangularconductive metal frame 32 be erected atpentaprism 12sampling face 121 around, therefore when human finger is pressedsampling face 121 at pentaprism, naturally, finger just drops in the rectangularconductive metal frame 32, therefore, all can sense finger onwireless induction antenna 32 four direction inwardly, realize induction in all directions, thereby induced signal is passed to livebody induction chip 31 to be handled,wake light source 11 of the present invention,image sensor module 14 and fingerprintsignal processing module 2 then up and start, carry out fingerprint collecting and identification.

In addition, present embodiment, the data output end of describedimage sensor module 14 is connected on the signal input part of fingerprintsignal processing module 2 by row's pin.By row's battle array data are transmitted, not only made the data output end ofimage sensor module 14 and the signal input part of fingerprintsignal processing module 2 be connected closely, reduce accident and make mistakes.

Claims (5)

1. living fingerprint capturer, include the optical finger print image-forming module, the fingerprint signal processing module, described optical finger print image-forming module includes the light source that is provided with according to light path, prism, image-forming objective lens, image sensor module, this image sensor module includes imageing sensor, it is characterized in that: described prism is a pentaprism, this pentaprism include be parallel to each other over against sampling face and transparent surface and the imaging surface relative with image-forming objective lens, and be coated with light shield layer on its lap of this pentaprism, described light source is arranged at the transparent surface below of pentaprism, and is provided with diffusion barrier between the transparent surface of this pentaprism and the light source.

2. living fingerprint capturer according to claim 1, it is characterized in that: also include the wireless induction wake module, this wireless induction wake-up mechanism includes the live body induction chip and is connected in wireless induction antenna on the live body induction chip, this wireless induction antenna is the rectangular conductive metal frame adaptive with the sampling face size of pentaprism, this rectangular conductive metal frame be arranged at pentaprism sampling face around.

3. living fingerprint capturer according to claim 1 and 2 is characterized in that: the data output end of described image sensor module is connected on the signal input part of fingerprint signal processing module by row's pin.

4. living fingerprint capturer according to claim 3 is characterized in that: described imageing sensor is a cmos image sensor.

5. living fingerprint capturer according to claim 4 is characterized in that: described light source is a high-brightness LED lamp.

Images