CN208922283U - A kind of waterproof, anti-fake fingerprint acquisition device - Google Patents
A kind of waterproof, anti-fake fingerprint acquisition device Download PDFInfo
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- CN208922283U CN208922283U CN201821632094.4U CN201821632094U CN208922283U CN 208922283 U CN208922283 U CN 208922283U CN 201821632094 U CN201821632094 U CN 201821632094U CN 208922283 U CN208922283 U CN 208922283U
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Abstract
The utility model provides a kind of waterproof, anti-fake fingerprint acquisition device, including lighting source, acquisition window prism, reflective microscope group, imaging acquisition camera lens and imaging sensor, the lighting source includes side lighting source and bottom illuminating light source, the side lighting source is placed in the side of acquisition window prism, the bottom illuminating light source is placed in the underface of acquisition window prism, the reflective mirror is mounted between acquisition window prism and imaging acquisition camera lens, reflection light by reflective microscope group passes through imaging acquisition camera lens and is ultimately imaged imaging sensor, described image sensor is set at the light-emitting window of imaging acquisition camera lens.A kind of waterproof described in the utility model, anti-fake fingerprint acquisition device, guarantee equipment acquire living body finger print when, the function of waterproof can be provided, can also judge that the fingerprint of the acquisition is true fingerprint or pseudo- fingerprint, achieve the purpose that the real true fingerprint of acquisition excludes pseudo- fingerprint.
Description
Technical field
The utility model belongs to technical field of biometric identification, more particularly, to a kind of waterproof, anti-fake fingerprint acquisition device.
Background technique
Under nowadays big data, the background of networked information era, for the authenticity of data acquisition, safety to Guan Chong
It wants, and especially prominent with financial internet area.Fingerprint acquisition instrument is most mature as technology, and application range is most widely biological
It identifies product, should more have the ability of acquisition large amount of data information, but also must satisfy under varying environment weather, distinct group
The use demand of the wet finger of soma, and have anti-fake function.
In existing technology, other other than RF type fingerprint acquisition instrument has the ability of certain anti-fake fingerprint
It is right if optical profile type, pressure sensitive, condenser type, inductance type, heat-sensitive type and ultrasonic type do not have the effect of good anti-fake fingerprint
Guarantee is hardly resulted in the authenticity of acquisition data.But RF type fingerprint acquisition instrument is at high cost, it is expensive, and RF type
Fingerprint acquisition instrument can not identify the pseudo- fingerprint being process using conductive material.If the liquid such as water are stained on finger, or
Person is dry finger, and the data of that acquisition just will appear deviation, directly affects final comparison.
For the amount of acquisition data, acquisition window is bigger, and data collected are more, and identification contrast is higher,
But at present in addition to traditional optical formula can satisfy under the premise of controlling cost, provides and can acquire four fingers, the fingerprint of palmmprint is adopted
Collect except instrument, other several fingerprint acquisition instruments are difficult to accomplish the Acquisition Instrument of four fingers of large area acquisition, palmmprint.
To solve the above problems, needing a kind of waterproof of R & D design, anti-fake fingerprint acquisition device.
Utility model content
In view of this, the utility model is directed to a kind of waterproof, anti-fake fingerprint acquisition device, to improve fingerprint collecting dress
The safety and usability of the waterproof, anti-fake fingerprint set.
In order to achieve the above objectives, the technical solution of the utility model is achieved in that
A kind of waterproof, anti-fake fingerprint acquisition device, including lighting source, acquisition window prism, reflective microscope group, imaging acquisition
Camera lens and imaging sensor, the lighting source include side lighting source and bottom illuminating light source, and the side lighting source is placed in
The side of acquisition window prism, the bottom illuminating light source are placed in the underface of acquisition window prism, the side lighting source and
Bottom illuminating light source uses the light of different spectral wavelengths, the reflective mirror be mounted on acquisition window prism and imaging acquisition camera lens it
Between, the reflection light by reflective microscope group passes through imaging acquisition camera lens and is ultimately imaged imaging sensor, described image sensing
Device is set at the light-emitting window of imaging acquisition camera lens.
Further, the reflective microscope group includes the first reflective mirror, the second reflective mirror and third reflective mirror, by reflective mirror
Optical path primary optical axis after group reflection is parallel with the acquisition window of acquisition window prism；The light that the side lighting source projects is indigo plant
Color, the light that the bottom illuminating light source projects are feux rouges.
It further, further include spectroscope, the first filter plate and the second filter plate, the spectroscope is located at the second reflective mirror
Between third reflective mirror, first filter plate and the second filter plate are located at the first imaging acquisition camera lens and the second imaging
At the light-emitting window for acquiring camera lens, the blue light that the side lighting source issues is irradiated to the acquisition window of acquisition window prism from side
Face forms total reflection, and total reflection light reflects after the first reflective mirror and the second mirror reflection by spectroscope, into first
Imaging acquisition camera lens, the first filter plate are simultaneously ultimately imaged to the first imaging sensor, form the bright back that fingerprint portion is dark fringe
Scape fingerprint image；The feux rouges that the bottom illuminating light source issues is irradiated to the acquisition window of acquisition window prism from Collection prism bottom
Face scatters, and scattering light passes through spectroscope after the first reflective mirror and the second mirror reflection, then through third reflective mirror
Reflection into the second imaging acquisition camera lens, the second filter plate and is ultimately imaged to the second imaging sensor II, forms fingerprint portion
For the dark background fingerprint image of bright fringes.
Further, field-of-view lens are equipped between the acquisition window prism and reflective microscope group；The acquisition window prism
Material is the H-ZF1 glass of Chengdu light, and the angle of total reflection of acquisition window prism is greater than 54 °, less than 70 °.
Further, the imaging acquisition camera lens is single group or the optical lens group that multiple groups eyeglass forms.
Compared with the existing technology, a kind of waterproof described in the utility model, anti-fake fingerprint acquisition device have the advantage that
A kind of waterproof described in the utility model, anti-fake fingerprint acquisition device, on the basis of conventional fingerprint acquires equipment
Double lighting sources have been used, and have used the H-ZF1 glass of Chengdu light of the angle of total reflection greater than 54 ° as acquisition window rib
Mirror, ensure that in this way equipment acquire living body finger print when, the function of waterproof can be provided, can also judge the fingerprint of the acquisition
It is true fingerprint or pseudo- fingerprint, has achieved the purpose that the real true fingerprint of acquisition excludes pseudo- fingerprint, ensure that the true of acquisition data
Reality, by the reflection and refraction acquisition imaging of light, so that equipment manufacturing costs are low, small in size, light-weight, assembly is simple.
Detailed description of the invention
The attached drawing for constituting a part of the utility model is used to provide a further understanding of the present invention, this is practical new
The illustrative embodiments and their description of type are not constituteed improper limits to the present invention for explaining the utility model.?
In attached drawing:
Fig. 1 is the light channel structure schematic diagram of traditional optical lens type fingers and palms line Acquisition Instrument；
Fig. 2 is to show according to a kind of waterproof of the utility model, the light channel structure of the embodiment one of anti-fake fingerprint acquisition device
It is intended to；
Fig. 3 is to show according to a kind of waterproof of the utility model, the light channel structure of the embodiment two of anti-fake fingerprint acquisition device
It is intended to.
Description of symbols:
1, lighting source；1-1, side lighting source；1-2, bottom illuminating light source；2, acquisition window prism；3, field-of-view lens；4-
1, the first reflective mirror；4-2, the second reflective mirror；4-3, third reflective mirror；5, imaging acquisition camera lens；5-1, the first imaging acquisition mirror
Head；5-2, the second imaging acquisition camera lens；6, imaging sensor；6-1, the first imaging sensor；6-2, the second imaging sensor；7,
Spectroscope；8-1, the first filter plate；8-2, the second filter plate.
Specific embodiment
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For limitations of the present invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more of the features.It is in the description of the present invention, unless another
It is described, the meaning of " plurality " is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State the concrete meaning of term in the present invention.
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of waterproof described in the utility model, the principle of anti-fake fingerprint acquisition device are as follows:
According to the refraction principle of light:
n1sin(θ1)=n2sin(θ2)
n1It indicates that light dredges material refractive index, herein refers to finger there are environment,
θ1Indicate the angle of emergence,
n2Indicate the close material refractive index of light, shown herein as acquisition window Refractive Index of Glass Prism,
θ2Indicate incidence angle,
Work as incidence angle θ2Meet sin (θ2)≥n1/n2When, light will occur in the acquisition window face of acquisition window prism (2)
Total reflection is emitted without light from acquisition window face.
Work as incidence angle θ2Meet sin (θ2) < n1/n2When, light will go out from the acquisition window face of acquisition window prism (2)
It penetrates, dredges material into light.
The refractive index of the cuticula of human skin is 1.56, higher than the refractive index 1.0 of air, so if incidence angle is full
Sufficient 1.56/n2> sin (θ2)≥1/n2When, just it will appear when the acquisition window face of finger contact acquisition window prism (2), skin
Skin not in contact with part, light is totally reflected, and some light of skin contact, which penetrates, to be entered skin and absorb.Here it is tradition
The optical principle of optical ftngetpnnt acquisidon.
As shown in Figure 1, the illumination that lighting source 1 issues is mapped to acquisition window prism 2 in traditional fingerprint acquisition instrument
Acquisition window face forms in acquisition window face and is totally reflected, practical when the acquisition window face of finger contact acquisition window prism 2
The ridge of upper only finger skin has touched acquisition window face, and the mountain valley of finger skin is then not exposed to acquisition window
Face can not form total reflection since the ridge of finger skin has touched acquisition window face, to form light and dark finger
The image of line, the light of total reflection, which passes through, forms convergence effect by field-of-view lens 3, so that entire light path system forms telecentricity light
Road, to eliminate the distortion of entire imaging system.The light calibrated by field-of-view lens 3 is using the first reflective mirror 4-1, the
Two reflective mirror 4-2, third reflective mirror 4-3 reflection after enter imaging acquisition camera lens (5), and finally converge at imaging sensor 6,
Form the fingerprint image of bright background.
In traditional fingerprint acquisition system design, but when finger touches the collecting window of water or acquisition window prism 2
When there are many steam in mouthful face, there are environment to be just changed into water for finger, and the refractive index of water is 1.33, will have water or steam
The light in the acquisition window face of acquisition window prism 2 passes through the phenomenon that acquisition window face is without being totally reflected, and affects data
The accuracy of acquisition.
Embodiment one
In the present embodiment, the material of acquisition window prism 2 is the H-ZF1 of Chengdu light, refractive index 1.648, by hand
Refer to that existing environment is arranged to water, the refractive index of water is 1.33, in this way when light the acquisition window face of acquisition window prism 2 according to
When so meeting total reflection condition, above-mentioned phenomenon would not occur, ensure that the accuracy of data acquisition.So:
(1.56)/(1.648)>sin(θ2)≥(1.33)/(1.648)
It that is to say: 71.2 ° > θ2≥53.8°
So the angle of total reflection when acquisition window prism 2 is greater than 54 °, when less than 70 °, waterproof fingerprint collecting may be implemented
Function.
As shown in Fig. 2, a kind of waterproof, anti-fake fingerprint acquisition device, including lighting source 1, acquisition window prism 2 are reflective
Microscope group, imaging acquisition camera lens 5 and imaging sensor 6, the lighting source include side lighting source 1-1 and bottom illuminating light source 1-2,
The side lighting source 1-1 is placed in the side of acquisition window prism 2, and the bottom illuminating light source 1-2 is placed in acquisition window rib
The underface of mirror 2, the side lighting source 1-1 and bottom illuminating light source 1-2 use the light of different spectral wavelengths, the reflective microscope group
Between acquisition window prism 2 and imaging acquisition camera lens 5, the reflection light by reflective microscope group passes through imaging acquisition camera lens 5
And it is ultimately imaged imaging sensor 6, described image sensor 6 is set at the light-emitting window of imaging acquisition camera lens 5.
In the entire system, the blue light that side lighting source 1-1 first is issued is irradiated to adopting for acquisition window prism 2 from side
Collect window side, formed and be totally reflected in acquisition window face, when the acquisition window face of finger contact fingerprint collecting prism 2, actually
Only the ridge of finger skin has touched acquisition window face, and the mountain valley of finger skin is then not exposed to acquisition window face,
Total reflection can not be formed since the ridge of finger skin has touched acquisition window face, total reflection light passes through imaging acquisition mirror
First 5 and it is ultimately imaged imaging sensor 6, forms the bright background fingerprint image that fingerprint portion is dark fringe.
At the same time, the red light irradiation that bottom illuminating light source 1-2 is issued works as hand to the acquisition window face of acquisition window prism 2
When the acquisition window face of abutment fingerprint collecting prism 2, the light of bottom illuminating light source 1-2 irradiates in one's hands from 2 bottom of Collection prism
Refer to and scatter, scattering light is by imaging acquisition camera lens 5 and is ultimately imaged imaging sensor 6, forms fingerprint portion
For the dark background fingerprint image of bright fringes.
It is made of in the pixel of imaging sensor 6 three kinds of different pixels of red, green, blue, the pixel of different colors
Point is different to the response type of different wavelengths of light, and since the wavelength of side lighting source 1-1 and bottom illuminating light source 1-2 is different, side is shone
The light of Mingguang City source 1-1 is blue, and the light of bottom illuminating light source 1-2 is red, thus can be by extracting the red of imaging sensor
The pixel of chrominance channel obtains the dark background fingerprint image that fingerprint portion is bright fringes；By the blue channel for extracting imaging sensor
Pixel obtain fingerprint portion be dark fringe bright background fingerprint image；By the pixel for extracting the green channel of imaging sensor
Obtain the image of the combined lighting of side lighting source 1-1 and bottom illuminating light source 1-2.Because human skin is to the light of different-waveband
Scattered power is different, and scattering and human skin of the unlike material for being processed into pseudo- fingerprint for the light of different-waveband
The scattering of the light of different-waveband is different, according to the difference of these scattered powers, by comparing three channel different colours pictures
The data information of element, so that it may pseudo- fingerprint recognition is carried out while acquiring fingerprint.
Embodiment two
In the present embodiment, the material of acquisition window prism 2 is the H-ZF1 of Chengdu light, refractive index 1.648, by hand
Refer to that existing environment is arranged to water, the refractive index of water is 1.33, in this way when light the acquisition window face of acquisition window prism 2 according to
When so meeting total reflection condition, above-mentioned phenomenon would not occur, ensure that the accuracy of data acquisition.So:
(1.56)/(1.648)>sin(θ2)≥(1.33)/(1.648)
It that is to say 71.2 ° > θ2≥53.8°
So the angle of total reflection when acquisition window prism (2) is greater than 54 °, less than 70 °, waterproof fingerprint collecting may be implemented
Function.
As shown in figure 3, waterproof, anti-fake fingerprint acquisition device in double illuminations of the utility model, including lighting source 1,
Acquisition window prism 2, reflective microscope group, imaging acquisition camera lens 5 and imaging sensor 6 further include field-of-view lens 3, spectroscope 7,
One filter plate 8-1 and the second filter plate 8-2, the lighting source includes side lighting source 1-1 and bottom illuminating light source 1-2, described
Side lighting source 1-1 is placed in the side of acquisition window prism 2, and the bottom illuminating light source 1-2 is placed in acquisition window prism 2
Underface, the side lighting source 1-1 and bottom illuminating light source 1-2 use the light of different spectral wavelengths, and the reflective mirror is mounted on
Between acquisition window prism 2 and imaging acquisition camera lens 5, reflection light by reflective microscope group is by imaging acquisition camera lens 5 and most
It is imaged onto imaging sensor 6 eventually, described image sensor 6 is set at the light-emitting window of imaging acquisition camera lens 5, the reflective microscope group packet
Include the first reflective mirror 4-1, the second reflective mirror 4-2 and third reflective mirror 4-3, by reflective microscope group reflection after optical path primary optical axis with
The acquisition window of acquisition window prism 2 is parallel；The light that the side lighting source 1-1 is projected is blue, the bottom illuminating light source 1-2
The light of injection is feux rouges, and the field-of-view lens 3 are positioned at acquisition window prism 2 and reflective microscope group between, and the spectroscope 7 is positioned at the
Between two reflective mirror 4-2 and third reflective mirror 4-3, the first filter plate 8-1 and the second filter plate 8-2 are located at the first one-tenth
At light-emitting window as acquiring camera lens 5-1 and the second imaging acquisition camera lens 5-2.
In the entire system, the blue light that side lighting source 1-1 first is issued is irradiated to adopting for acquisition window prism 2 from side
Collect window side, formed and be totally reflected in acquisition window face, when the acquisition window face of finger contact fingerprint collecting prism 2, actually
Only the ridge of finger skin has touched acquisition window face, and the mountain valley of finger skin is then not exposed to acquisition window face,
Total reflection can not be formed since the ridge of finger skin has touched acquisition window face, is totally reflected light through the first reflective mirror 4-
1 and second reflective mirror 4-2 reflection after by spectroscope 7 reflect, simultaneously into the first imaging acquisition camera lens 5-1, the first filter plate 8-1
It is ultimately imaged to the first imaging sensor 6-1, forms the bright background fingerprint image that fingerprint portion is dark fringe.
At the same time, the red light irradiation that bottom illuminating light source 1-2 is issued works as hand to the acquisition window face of acquisition window prism 2
When the acquisition window face of abutment fingerprint collecting prism 2, the light of bottom illuminating light source 1-2 irradiates in one's hands from 2 bottom of Collection prism
Refer to and scatter, scattering light after the first reflective mirror 4-1 and the second reflective mirror 4-2 reflection by spectroscope 7, then through the
Three reflective mirror 4-3 reflection, into the second imaging acquisition camera lens 5-2, the second filter plate 8-2 and is ultimately imaged to the second image sensing
Device 6-2 forms the dark background fingerprint image that fingerprint portion is bright fringes.
Because human skin is different the scattered power of the light of different-waveband, and the difference for being processed into pseudo- fingerprint
Material is different the scattering of the light of different-waveband and human skin to the scattering of the light of different-waveband, according to these scatterings
The difference of rate, by comparing two imaging sensor data informations collected, so that it may be carried out while acquiring fingerprint pseudo-
Fingerprint recognition.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (7)
1. a kind of waterproof, anti-fake fingerprint acquisition device, it is characterised in that: including lighting source (1), acquisition window prism (2), instead
Light microscopic group, imaging acquisition camera lens (5) and imaging sensor (6), the lighting source include side lighting source (1-1) and bottom illumination
Light source (1-2), the side lighting source (1-1) are placed in the side of acquisition window prism (2), the bottom illuminating light source (1-2)
It is placed in the underface of acquisition window prism (2), the side lighting source (1-1) and bottom illuminating light source (1-2), which use, does not share the same light
The light of spectrum wavelength, the reflective mirror is mounted between acquisition window prism (2) and imaging acquisition camera lens (5), by reflective microscope group
Reflection light by imaging acquisition camera lens (5) and being ultimately imaged imaging sensor (6), described image sensor (6) is set to
At the light-emitting window of imaging acquisition camera lens (5).
2. a kind of waterproof according to claim 1, anti-fake fingerprint acquisition device, it is characterised in that: the reflective microscope group packet
The first reflective mirror (4-1), the second reflective mirror (4-2) and third reflective mirror (4-3) are included, the optical path master after the reflection of reflective microscope group
Optical axis is parallel with the acquisition window of acquisition window prism (2).
3. a kind of waterproof according to claim 2, anti-fake fingerprint acquisition device, it is characterised in that: the side lighting source
The light that (1-1) is projected is blue, and the light that the bottom illuminating light source (1-2) is projected is feux rouges.
4. a kind of waterproof according to claim 3, anti-fake fingerprint acquisition device, it is characterised in that: further include spectroscope
(7), the first filter plate (8-1) and the second filter plate (8-2), the spectroscope (7) is located at the second reflective mirror (4-2) and third is anti-
Between light microscopic (4-3), first filter plate (8-1) and the second filter plate (8-2) are located at the first imaging acquisition camera lens (5-
1) and at the light-emitting window of the second imaging acquisition camera lens (5-2), the blue light that the side lighting source (1-1) issues is irradiated to from side
The acquisition window face of acquisition window prism (2), forms total reflection, and total reflection light is reflective through the first reflective mirror (4-1) and second
It is reflected after mirror (4-2) reflection by spectroscope (7), into the first imaging acquisition camera lens (5-1), the first filter plate (8-1) and most
It is imaged onto the first imaging sensor (6-1) eventually, forms the bright background fingerprint image that fingerprint portion is dark fringe；The bottom illumination light
The feux rouges that source (1-2) issues is irradiated to the acquisition window face of acquisition window prism (2) from Collection prism (2) bottom, scatters,
Scattering light passes through spectroscope (7) after the first reflective mirror (4-1) and the second reflective mirror (4-2) reflection, then reflective through third
Mirror (4-3) reflection, into the second imaging acquisition camera lens (5-2), the second filter plate (8-2) and is ultimately imaged to the second image sensing
Device II (6-2) forms the dark background fingerprint image that fingerprint portion is bright fringes.
5. a kind of waterproof according to claim 4, anti-fake fingerprint acquisition device, it is characterised in that: the acquisition window rib
Field-of-view lens (3) are equipped between mirror (2) and reflective microscope group.
6. a kind of waterproof according to claim 1, anti-fake fingerprint acquisition device, it is characterised in that: the acquisition window rib
Mirror (2) material is the H-ZF1 glass of Chengdu light, and the angle of total reflection of acquisition window prism (2) is greater than 54 °, less than 70 °.
7. a kind of waterproof according to claim 1-6, anti-fake fingerprint acquisition device, it is characterised in that: it is described at
As acquisition camera lens (5) is single group or the optical lens group that multiple groups eyeglass forms.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821632094.4U CN208922283U (en) | 2018-10-09 | 2018-10-09 | A kind of waterproof, anti-fake fingerprint acquisition device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821632094.4U CN208922283U (en) | 2018-10-09 | 2018-10-09 | A kind of waterproof, anti-fake fingerprint acquisition device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110457986A (en) * | 2019-06-04 | 2019-11-15 | 广州汉玛智慧信息技术有限责任公司 | A kind of ultra-thin moisture-proof finger print information acquisition terminal |
| CN112800956A (en) * | 2021-01-27 | 2021-05-14 | 杭州海康威视数字技术股份有限公司 | Fingerprint in-vivo detection system, method and device |
-
2018
- 2018-10-09 CN CN201821632094.4U patent/CN208922283U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110457986A (en) * | 2019-06-04 | 2019-11-15 | 广州汉玛智慧信息技术有限责任公司 | A kind of ultra-thin moisture-proof finger print information acquisition terminal |
| CN112800956A (en) * | 2021-01-27 | 2021-05-14 | 杭州海康威视数字技术股份有限公司 | Fingerprint in-vivo detection system, method and device |
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