CN204463160U - Fingers and palms line imaging system - Google Patents
Fingers and palms line imaging system Download PDFInfo
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- CN204463160U CN204463160U CN201520158655.1U CN201520158655U CN204463160U CN 204463160 U CN204463160 U CN 204463160U CN 201520158655 U CN201520158655 U CN 201520158655U CN 204463160 U CN204463160 U CN 204463160U
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Abstract
The utility model discloses a kind of fingers and palms line imaging system, comprise the fluid chamber outer wall set gradually, the fluid chamber being full of transparency liquid, fluid chamber inwall, cavity, be placed in the catoptron group of fluid chamber, be placed in the light source in cavity or fluid chamber, be placed in the imaging mechanism in cavity; The outside surface of fluid chamber outer wall is collection face, and for contacting with the palm of fingers and palms line to be collected, fluid chamber outer wall and fluid chamber inwall are transparent material; Light source, keep fixed angle between catoptron group and imaging mechanism and relative position between three is constant, and three can synchronizing moving and imaging mechanism can synchronous acquisition reflected light; Light path in imaging system is: the light that light source is launched produces reflected light on the collection face contacted with the palm of fingers and palms line to be collected, after the reflection of catoptron group enters cavity, is gathered and form fingers and palms line by imaging mechanism.The fingers and palms line imaging system that the utility model provides, more compact structure, has volume little, lightweight, the feature that production cost is lower.
Description
Technical field
The utility model relates to fingers and palms print image acquiring technology field, refers to a kind of fingers and palms line imaging system especially.
Background technology
In recent years, along with developing rapidly of biological identification technology and Internet technology, fingerprint recognition product has penetrated among routine work life.Wherein, four finger collection instrument and half palm fingers and palms line Acquisition Instrument are the main products of entry and exit and the application of criminal investigation field.Along with the requirement of level of security is more and more higher, the requirement for collector acquisition capacity also improves thereupon, comprises picture quality and gathers area two aspect.
For the requirement of picture quality aspect, existing optical fingerprint Acquisition Instrument, mainly through the fingerprint image adopting inner full-reflection to realize high contrast.As shown in Figure 1, be the principle schematic of existing optical fingerprint Acquisition Instrument, its principle is as follows, prism normally glass or plastics in this quasi-instrument, Refractive Index of Glass Prism n
1be greater than air refraction n
2.As illuminating ray θ at a certain angle
1when (being greater than critical angle) is from surface of contact (the collection face) of the inner directive prism of prism and air, noncontact position (fingerprint paddy) experiences total internal reflection θ
2, the light in experiences total internal reflection region is collected by optical system, thus forms bright background image; And will destroy in the region total internal reflection condition that fingerprint ridge contacts with prism surface, only have the scattered beam of few part to be imaged systematic collection, compare the background that total reflection is formed, the image in the region of ridge is very dark, therefore forms the image that bright background infers line.
On the other hand, the requirement gathering enlarged areas realizes bringing huge difficulty to technology, because the growth cube of equipment volume is in the increase of acquisition window size, cost is also multiplied.This is a difficult problem for current all fingerprint collecting technology (optics, electronics and ultrasound wave) institute facing.This difficult problem is particularly outstanding in the design of full fingers and palms line collecting device.Existing full fingers and palms line acquisition technique (optics) is mainly divided into two kinds, one is to full palm cun by simple for light path Linear Amplifer, the shortcoming done like this, equipment volume is huge, uses inconvenience, cost is also high to allowing people be difficult to accept, if adopt plane prism, gather whole fingers and palms line, need the acquisition window of 6x8 inch, and realizing the image of 500ppi/1000ppi (picture element density), required imageing sensor price is high.If employing line scan image sensor, this part expense decreases, but centrum/cylinder prism that manufacture coordinates with it is also very expensive.Another scheme adopts cone or column prism to gather fingerprint in the mode of rotation sweep.US Patent No. 2006169159 discloses this type of optical imaging device a kind of.This device comprises a larger solid circular prism.Therefore, although this technical scheme makes cost decrease, the cost of centrum/cylinder prism is also costly, and in addition, equipment volume is still very huge.
Utility model content
In view of this, the purpose of this utility model is to propose a kind of fingers and palms line imaging system, meets for image acquisition device collection image quality and the requirement gathering area.Meanwhile, possess volume little, lightweight, cost is suitable for the features such as large-scale production.
Based on a kind of fingers and palms line imaging system that above-mentioned purpose the utility model provides, comprise the fluid chamber outer wall set gradually, the fluid chamber being full of transparency liquid, fluid chamber inwall, cavity, and be placed in the catoptron group of fluid chamber, be placed in the light source in cavity or fluid chamber, be placed in the imaging mechanism in cavity; Wherein, the outside surface of described fluid chamber outer wall is collection face, and for contacting with the palm of fingers and palms line to be collected, described fluid chamber outer wall and fluid chamber inwall are transparent material;
Light source, keep fixed angle between catoptron group and imaging mechanism and relative position between three is constant, and three can synchronizing moving and imaging mechanism can synchronous acquisition reflected light; Wherein, light path in described imaging system is: the light that described light source is launched produces total reflection light or frustrated total reflection on the collection face contacted with the palm of fingers and palms line to be collected, again after the reflection of catoptron group enters cavity, gathered by imaging mechanism and form fingers and palms line.
In some embodiments, described imaging mechanism comprises lens or lens combination, and imageing sensor; Described imageing sensor is line scan image sensor or array image sensor.
In some embodiments, the transparency liquid of filling in described fluid chamber is distilled water, oil or other liquid, and described fluid chamber outer wall and fluid chamber inwall are colourless transparent glass, quartz or other transparent materials.
In some embodiments, described light source adopts the line source of monochromatic LED or laser or linearly aligned multiple pointolite.
In some embodiments, described fluid chamber outer wall and fluid chamber inwall are hollow cylinder shaped, and fluid chamber inwall is placed in fluid chamber outer wall and the two coaxial setting, and form fluid chamber therebetween, in fluid chamber, pars intramuralis is formed as cavity;
Fluid chamber inwall can rotate around its central axis, and light source, imaging mechanism and catoptron group are all fixedly connected with fluid chamber inwall and rotate along with the rotation of fluid chamber inwall.
In some embodiments, described catoptron group comprises the first catoptron with the second catoptron and the reflecting surface of the two is relative; Light source is placed in fluid chamber;
Described first catoptron is arranged near light source, and its reflecting surface is an angle towards light source and with the light path of light source; Described second catoptron is arranged near imaging mechanism, and its reflecting surface is an angle towards imaging mechanism and with the light path of imaging mechanism.
In some embodiments, described catoptron group only comprises a catoptron; Described catoptron is arranged near imaging mechanism, and its reflecting surface is an angle towards imaging mechanism and with the light path of imaging mechanism; Described light source is arranged on cavity inside or is arranged in fluid chamber; When light source is arranged in fluid chamber, the irradiating angle of light source is angle of inclination or vertical angle injection.
In some embodiments, described fluid chamber outer wall and fluid chamber inwall are writing board shape, and fluid chamber inwall is placed in below fluid chamber outer wall and the two parallel or less parallel is arranged, and forms fluid chamber therebetween, is formed as cavity below fluid chamber inwall;
Light source can move horizontally in cavity or in fluid chamber, and imaging mechanism can move horizontally in cavity, and catoptron group moves with light source and imaging mechanism level of synchronization in fluid chamber.
In some embodiments, described catoptron group comprises the first catoptron with the second catoptron and the reflecting surface of the two is relative; Light source is placed in fluid chamber;
Described first catoptron is arranged near light source, and its reflecting surface is an angle towards light source and with the light path of light source; Described second catoptron is arranged near imaging mechanism, and its reflecting surface is an angle towards imaging mechanism and with the light path of imaging mechanism.
In some embodiments, described catoptron group only comprises a catoptron; Described catoptron is arranged near imaging mechanism, and its reflecting surface is an angle towards imaging mechanism and with the light path of imaging mechanism; Described light source is arranged on cavity inside or is arranged in fluid chamber; When light source is arranged in fluid chamber, the irradiating angle of light source is angle of inclination or vertical angle injection.
As can be seen from above, the fingers and palms line imaging system that the utility model provides, adopts the liquid prism being filled with liquid in cavity, by placing optical element in a liquid, thus be held in picture light to be totally reflected angle incidence/outgoing, and then obtain the fingerprint image of high-contrast.This optical element, by carrying out synchronous scanning with imaging optical path, splices obtained topography, realizes the image acquisition to whole collection face.The utility model advantage is that volume is little, lightweight, and cost is low, and global design more meets ergonomics, has better experience effect.
Accompanying drawing explanation
Fig. 1 is the principle schematic of existing optical fingerprint Acquisition Instrument;
The structural representation of fingers and palms line imaging system first embodiment that Fig. 2 provides for the utility model;
The part-structure enlarged diagram of fingers and palms line imaging system first embodiment that Fig. 3 provides for the utility model;
Angular relationship schematic diagram in the light path of fingers and palms line imaging system first embodiment that Fig. 3 a provides for the utility model;
The triangle schematic diagram that in the light path of fingers and palms line imaging system first embodiment that Fig. 3 b provides for the utility model, light is formed;
Fingers and palms line imaging system first embodiment that Fig. 3 c provides for the utility model impinge perpendicularly on angular relationship schematic diagram in the bright background light path of the first catoptron;
The dark background light path replacement scheme structural representation of fingers and palms line imaging system first embodiment that Fig. 4 provides for the utility model;
Angular relationship schematic diagram in the light path of the dark background light path replacement scheme of fingers and palms line imaging system first embodiment that Fig. 4 a provides for the utility model;
The structural representation of fingers and palms line imaging system second embodiment that Fig. 5 provides for the utility model;
Angular relationship schematic diagram in the light path of fingers and palms line imaging system second embodiment that Fig. 5 a provides for the utility model;
The dark background light path replacement scheme structural representation of fingers and palms line imaging system second embodiment that Fig. 6 provides for the utility model;
Angular relationship schematic diagram in the light path of the dark background light path replacement scheme of fingers and palms line imaging system second embodiment that Fig. 6 a provides for the utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described.
The physics principle that the embodiment of the fingers and palms line imaging system that the utility model provides utilizes is frustrated total internal reflection (FTIR, frustrated Total Internal Reflection), and its ultimate principle is as follows:
Incident light is by optically denser medium n
1be mapped to optically thinner medium n
2interface time, if incidence angle θ
1be greater than critical angle θ
c, then all incident ray is reflected back toward former medium n
1interior phenomenon is called as total reflection.Although under common total reflection condition, light is all got back among incident medium, but has the change of a phase place, i.e. half-wave loss.And wave vector phase jump also means that the complex field of vector is decomposed.By theory calculate, the refraction of light in complex domain still can be found.Theory calculate process is as follows: incident light is decomposed into s light and p light.For s light, if incident angle is θ
1, refraction angle is θ
2, on interface, transmission coefficient t
s=2sin θ
2cos θ
1/ sin (θ
1+ θ
2), and when being totally reflected, n
1sin θ
1=n
2sin θ
2, sin θ
2>1, cos θ
2be an imaginary number, θ
2also be imaginary number, namely light is propagated in complex domain, and t
salso be plural number.This light is called evanescent wave, is only a kind of surface phenomena.Along with going deep into refracting medium, its amplitude exponentially decays, and almost can ignore outward in the distance of two wavelength.Can predict, after certain distance, there will be no new photon from refracting medium out, known by law of conservation of energy, the energy of common total reflection all will get back to incident medium.
The condition of above-mentioned analysis is that optical depth enters refracting medium and decays to enough little, if but refracting medium is very thin for wavelength.So by light path principle of reversibility, the light of complex domain just can be got back in real domain.This effect is exactly frustrated total internal reflection.The realization of frustrated total internal reflection requires to increase other one deck medium n on total reflection basis
3, medium n
3with medium n
2adjacent, and medium n
3refractive index be greater than medium n
2.Be different from the result of total reflection, when there is frustrated total internal reflection, only have some light can be reflected back to medium n
1, remainder is through medium n
2enter third layer medium n
3.In addition, the generation of frustrated total internal reflection effect also requires medium n
2thickness must within the scope of lambda1-wavelength.The transmissivity of frustrated total reflection is with medium n
2thickness increase and reduce, as medium n
2thickness when being increased to lambda1-wavelength order of magnitude left and right, transmissivity almost drops to 0.Therefore, by controlling interlayer n
2thickness (i.e. the attenuation degree of evanescent wave) ratio of reflected light and transmitted light can be controlled arbitrarily.
Below with reference to the accompanying drawings 2 to accompanying drawing 6, introduces the basic structure composition of the fingers and palms line imaging system embodiment that the utility model provides.Accompanying drawing 2-6 is structural representation, the part-structure enlarged diagram of first embodiment, the replacement scheme structural representation of first embodiment, the structural representation of second embodiment, the replacement scheme structural representation of second embodiment of fingers and palms line imaging system first embodiment that the utility model provides respectively.
Based on above principle, described fingers and palms line imaging system, comprise the fluid chamber outer wall 2 set gradually, the fluid chamber 3 being full of transparency liquid (without air bubble), fluid chamber inwall 4, cavity 5, and be placed in the catoptron group of fluid chamber 3, be placed in the light source 6 in cavity 5 and imaging mechanism 9; Wherein, the outside surface of described fluid chamber outer wall 2 is collection face 2-2, and for contacting with the palm of fingers and palms line to be collected, described fluid chamber outer wall 2 and fluid chamber inwall 4 are transparent material;
Light source 6, keep fixed angle between catoptron group and imaging mechanism 9 and relative position between three is constant, and three can synchronizing moving and imaging mechanism 9 can synchronous acquisition reflected light; Wherein, the light path in described imaging system is: the light that described light source 6 is launched produces reflected light on the collection face 2-2 contacted with the palm of fingers and palms line to be collected, after the reflection of catoptron group enters cavity 5, is gathered and form fingers and palms line by imaging mechanism 9.
Optionally, described imaging mechanism 9 comprises lens for focus reflection light or lens combination, and for the imageing sensor of image acquisition; Described imageing sensor can adopt line scan image sensor or array image sensor; Described light source 6 adopts the line source of monochromatic LED or laser or linearly aligned multiple pointolite, all to collect be at least linear image light data to meet line scan image sensor or array image sensor in position, each collection point; Described imageing sensor derives gathered image light data by connection handling device, thus obtains the view data of fingers and palms line.
In above-described embodiment, fluid chamber outer wall 2 and fluid chamber inwall 4 are the transparent material of solid, and what be filled with in fluid chamber 3 is transparency liquid, under normal circumstances, the refractive index of fluid chamber outer wall 2 and fluid chamber inwall 4 is greater than the refractive index of the transparency liquid be filled with in fluid chamber 3; Optionally, the transparency liquid of filling in described fluid chamber 3 is water or oil, and described fluid chamber outer wall 2 and fluid chamber inwall 4 are glass, quartz or plastics; Preferably, the transparency liquid of filling in described fluid chamber 3 is distilled water, because distilled water has the advantages that transparency is high, pollution-free and cost is low, is one of optimal medium; Preferably, described fluid chamber outer wall 2 and fluid chamber inwall 4 are colourless transparent glass.
In the embodiment that the utility model provides, adopt fluid chamber 3 and fluid chamber outer wall 2, fluid chamber inwall 4 substitutes conventional solid prism, the uniform dielectric making fluid chamber become refractive index to be greater than air, light can uniform rectilinear be propagated wherein, and be totally reflected at itself and the interface gathering face 2-2, the more important thing is, liquid in fluid chamber 3 can not stop the movement of internal mirror group, thus to realize catoptron group to be placed in fluid chamber 3 and to ensure that catoptron group is along with the synchronously movement flexibly of light source and imaging mechanism, make apparatus structure compacter, significantly reduce the weight of device simultaneously.
Optionally, the size of described fluid chamber outer wall 2 determines according to the size of palm to be measured, according to typical hand sizes in the present embodiment, preferably the size of fluid chamber outer wall 2 be set as: width is 6 inches, girth is for being greater than 12 inches (being about the size of both hands palm).
Further, with reference to accompanying drawing 2 and accompanying drawing 3, first specific embodiment of the fingers and palms line imaging system that the utility model provides is shown.
Described fluid chamber outer wall 2 and fluid chamber inwall 4 are hollow cylinder shaped, fluid chamber inwall 4 is placed in fluid chamber outer wall 2 and the two coaxial setting, fluid chamber outer wall 2 and fluid chamber inwall 4 closed at both ends, form fluid chamber 3 between, be formed as cavity 5 (being surrounded by fluid chamber inwall 4) in fluid chamber inwall 4 inside;
Fluid chamber inwall 4 can rotate around its central axis, and light source 6, imaging mechanism 9 and catoptron group are all fixedly connected with fluid chamber inwall 4 and rotate along with the rotation of fluid chamber inwall 4;
Wherein, described catoptron group comprises the first catoptron 7 that relative position fixes with the second catoptron 8 and the reflecting surface of the two is relative; Described first catoptron 7 is arranged near light source 6, and its reflecting surface is an angle towards light source 6 and with the light path of light source 6; Described second catoptron 8 is arranged near imaging mechanism 9, and its reflecting surface is an angle towards imaging mechanism 9 and with the light path of imaging mechanism 9; The Main Function of the first catoptron 7 and the second catoptron 8 is by reflection adjustment light transmition direction, guarantees that incident light is imaged mechanism 9 with the angle directive collection face 2-2 and reflection luminous energy that are not less than the cirtical angle of total reflection and receives; The light in some other structure and light path is also show in Fig. 2, comprise: the inside surface 2-1 of fluid chamber outer wall 2, imageing sensor 9-1, photo-sensitive cell 9-2, through the light 11-1 that the first catoptron 7 reflects, through the light 11-2 that the inside surface 2-1 of fluid chamber outer wall 2 reflects, through gathering the light 11-3 of face 2-2 reflection or scattering, shine the light 11-4 of the second catoptron 8, be imaged the light 11-5 that mechanism 9 collects;
The angle directive that the light that light source 6 is launched reflects to be not less than the angle of total reflection through the first catoptron 7 gathers face 2-2, in the region that fingers and palms line does not contact with collection face 2-2, experiences total internal reflection, light is almost all reflected back in fluid chamber 3 without loss, enter imaging mechanism 9 through the second catoptron 8 reflection, form bright background; And in the region that fingers and palms line contacts with collection face 2-2, due to the generation of frustrated total internal reflection effect, only have extremely weak scattered beam after the reflection of catoptron group, being imaged mechanism 9 collects, and then forms dark areas; Along direction of scanning 10 synchronizing moving, (light source 6, first catoptron 7 and the second catoptron 8 be synchronizing moving all while fluid chamber inwall 4 rotates for imaging mechanism 9, maintenance relative position is constant), thus complete the collection to gathering whole fingers and palms line on the 2-2 of face.By with upper type, bright background can be obtained from imaging mechanism 9 and infer palmprint image.
Particularly, with reference to accompanying drawing 3a-3c, the angular relationship about the light path in first embodiment is introduced.
Fig. 3 a is the enlarged diagram of fluid chamber outer wall 2 in first embodiment, comprises the inside surface 2-1 of collection face 2-2 and fluid chamber outer wall 2, n
0be the refractive index of place, collection face medium, be generally air n
0=1 urceolus Refractive Index of Material is n
1, the liquid refractivity in fluid chamber is n
2.
Incident angle when illuminating ray is irradiated to collection face is θ
1be θ with shooting angle
0have Snell law known:
n
0sinθ
0＝n
1sinθ
1，
Work as θ
0when=90 °, now incident angle is called that critical angle of incidence is:
θ
c＝sin
-1(n
0/n
1)，
Work as θ
1>=θ
ctime, be totally reflected at this interface, thus obtain the fingerprint image of high contrast.
Suppose that the internal diameter of fluid chamber outer wall 2 is R
1, wall thickness is d
1.Incide normal and the refracted ray of the refraction reflection on the inside surface of fluid chamber outer wall 2, and the triangle that the normal collection face of fluid chamber outer wall 2 occurring reflect forms as shown in Figure 3 b, because normal is vertical with circumference and they intersect at the concentrically ringed center of circle, have the law of sines known:
R
1/sinθ
1＝(R
1+d
1)/sin(180°-θ
2)，
Therefore,
θ
2＝sin
-1[(1+d
1/R
1)/sinθ
1]。
By θ
2and θ
3relation have Snell law:
n
2sinθ
3＝n
1sinθ
2，
θ
3＝sin
-1[(n
1/n
2)sinθ
2]。
Incident angle and the position of light source are depended in the angle of catoptron and position, although light source obliquely can be mapped to fluid chamber inwall 4 inside surface, light source being impinged perpendicularly on fluid chamber inwall 4 inside surface is reasonable selection.As shown in Figure 3 c, be a kind of situation impinging perpendicularly on fluid chamber inwall 4 inside surface, suppose that the normal angle that the inside surface of incident ray extended line and fluid chamber outer wall 2 occurs to reflect is α.Catoptron needs this incident ray to reflex to θ
3incide the light of outer tube inner wall, that is:
2θ
4＝180°-(α+θ
3)，
Thus,
θ
4＝90°-(α+θ
3)/2。
As aforementioned, the incident angle of light source has multiple choices, is mapped to fluid chamber inwall 4 inside surface as oblique.Light source position also can multiple choices, as long as after inciding fluid chamber, position and the angle of adjustment catoptron can make emergent ray with θ
3incide the inside surface of fluid chamber outer wall 2.Here no longer do and illustrate one by one and calculate, those skilled in the art can be easy to position according to light source and angle, obtain arriving the light after fluid chamber through two planes of refraction by Snell law, by adjusting position and the angle of catoptron, to make this light to the angle of the inside surface of fluid chamber outer wall 2 for θ
3.
In like manner, there is the light of total reflection in the face of collection, follow Snell law equally and draw emergent ray position and angle, thus determine position and the angle of lens or lens combination (imaging lens) in imaging mechanism 9.For the situation of vertical incidence, as shown in Figure 3 c, light is totally reflected normal symmetry at the light of fluid chamber inwall 4 and fluid chamber outer wall 2 inside about collection face.
Optionally, described fluid chamber inwall 4, by connecting the motor that is internal or external at cavity, controls motor rotation by controller and is with fluid cavities inwall 4 to realize rotating; In addition, this imaging system can set up aided location locating device, for detecting current residing angle position, location.
What preferably adopt in the present embodiment is line scan image sensor, and when tracer rotation system 10 rotates to a certain position, line scan image sensor is only to the range of linearity imaging that incident ray is crossing with gathering face 2-2.Along with the rotation of tracer rotation system 10, controller controls motor rotation and is with fluid cavities inwall 4 to realize rotating, thus drives light source 6, imaging mechanism 9 and catoptron group synchronous rotary, thus realizes the collection to fingers and palms line whole on collection face.Here, only when the collection face of linear light source 6 and line scan image sensor or array image sensor is enough large (under normal circumstances, actual device can meet required width), fluid chamber inwall 4 can only carry out spinning movement can complete image acquisition, if but it is large all not, then also need make light source 6, imaging mechanism 9 and catoptron group along the axis direction rectilinear motion of fluid chamber inwall 4 and carry out synchronous acquisition, just can complete the collection of whole fingers and palms line.
With reference to accompanying drawing 4, it is the replacement scheme structural representation of fingers and palms line imaging system first embodiment that the utility model provides.As the replacement scheme of first embodiment, by adjusting the position of light source 6 and catoptron group, the collection to the bright fingers and palms print image of dark background can be realized.
With first embodiment unlike, in this replacement scheme, described catoptron group only comprises a catoptron 12; Described catoptron 12 is arranged near imaging mechanism 9, and its reflecting surface is an angle towards imaging mechanism 9 and with the light path of imaging mechanism 9;
The light path vertical liquid cavity outer wall 2 of light source 6 and fluid chamber inwall 4 penetrate and almost vertical sand shooting to collection face 2-2, in the region that fingers and palms line does not contact with collection face 2-2, be directly transmitted to the external world, do not form reflection ray, imaging mechanism 9 is collected less than reflection ray, and then forms dark background; And in the region that fingers and palms line contacts with collection face 2-2, scattering is there is in the light of permeate body cavity walls, fluid chamber and fluid chamber outer wall at fingerprint place, some scattered beam, after catoptron 12 reflects, is imaged mechanism 9 and collects, and then form bright area on a dark background; Imaging mechanism 9 along direction of scanning 10 synchronizing moving (light source 6 and catoptron 12 be synchronizing moving all, keep relative position constant), thus completes the collection to gathering whole fingers and palms line on the 2-2 of face while fluid chamber inwall 4 rotates.
Particularly, with reference to accompanying drawing 4a, the angular relationship about the light path in the replacement scheme of first embodiment is described.
For the light path of dark background, namely illuminating ray incides fluid chamber inwall 4 with vertical angle, and arrive the outside surface (collection face) of fluid chamber outer wall 2, for the region not having skin contact, the direct liquid jet cavity outer wall 2 of this light, for the region having contact skin, in the light of skin scattering, shooting angle is not less than cirtical angle of total reflection degree θ
1>=θ
cthe position of camera lens and angle can determine that the Methods and steps of light source position is similar described in similar first embodiment, use Snell law to determine.The light source of dark background imaging, also can be incident with low-angle except vertical incidence.
Except above-mentioned replacement scheme, first embodiment can also have other replacement scheme, such as, is arranged in fluid chamber 3 by light source 6.
Can imagine, when light source 6 is arranged in fluid chamber 3, the irradiating angle of light source 6 is angle of inclination or vertical angle injection;
Wherein, when light source 6 irradiating angle is for vertically penetrating, the light path vertical liquid cavity outer wall 2 of light source 6 penetrates, in the region that fingers and palms line does not contact with collection face 2-2, directly be transmitted to the external world, do not form reflection ray, imaging mechanism 9 is collected less than reflection ray, and then formation dark background, and in the region that fingers and palms line contacts with collection face 2-2, scattering occurs on fingers and palms line surface transmitted ray, some scattered beam is after catoptron 12 reflects, be imaged mechanism 9 to collect, and then form bright area; Imaging mechanism 9 is synchronizing moving while fluid chamber inwall 4 rotates, thus completes the collection to gathering whole fingers and palms line on the 2-2 of face;
When light source 6 irradiating angle is for tilting to penetrate, the light that light source 6 is launched gathers face 2-2 with the angle directive being not less than the angle of total reflection, in the region that fingers and palms line does not contact with collection face 2-2, experiences total internal reflection, enters imaging mechanism 9 through catoptron 12 reflection, form bright background, and in the region that fingers and palms line contacts with collection face 2-2, due to the generation of frustrated total internal reflection effect, only have extremely weak scattered beam after catoptron 12 reflects, be imaged mechanism 9 to collect, and then form dark areas; Imaging mechanism 9 is synchronizing moving while fluid chamber inwall 4 rotates, thus completes the collection to gathering whole fingers and palms line on the 2-2 of face.
Optionally, described catoptron group can adopt common mechanical connection manner to be fixed on fluid chamber inwall 4, or is fixed (as in Figure 2-4) by integrated mode with fluid chamber inwall 4.
As can be seen from the utility model fingers and palms line imaging system first embodiment and alternate embodiment thereof, the fingers and palms line imaging system that the utility model provides, unitary construction adopts cylindrical design, collection face 2-2 is arranged at cylindrical outside surface, and by imaging mechanism and built-in light-source in inner cavity 5, thus the volume of remarkable reduction equipment.In addition, between collection face 2-2 and cavity 5, filling liquid is to substitute traditional prism, not only alleviate Whole Equipment weight, reduce production cost, the more important thing is, in the simplest and the most direct mode, catoptron group be arranged at interior in fluid chamber 3 and ensure that catoptron group is along with tracer rotation system synchronously movement flexibly, makes apparatus structure compacter, significantly reduces the weight of device simultaneously.In addition, the mode of operation of ring drot gfasplng meets ergonomics, has better experience effect.
Optionally, with reference to accompanying drawing 5, be the structural representation of fingers and palms line imaging system second embodiment that the utility model provides.
As shown in Figure 5, described fingers and palms line imaging system entirety adopts flat structure, described fluid chamber outer wall 2 and fluid chamber inwall 4 are writing board shape, fluid chamber inwall 4 is placed in below fluid chamber outer wall 2 and the two be arranged in parallel, therebetween form fluid chamber 3, below fluid chamber inwall 4, be formed as cavity 5; Light source 6 and imaging mechanism 9 can move horizontally in cavity 5, and catoptron group moves with light source 6 and imaging mechanism 9 level of synchronization in fluid chamber 3;
Described catoptron group comprises the first catoptron 7 with the second catoptron 8 and the reflecting surface of the two is relative; Described first catoptron 7 is arranged near light source 6, and its reflecting surface is an angle towards light source 6 and with the light path of light source 6; Described second catoptron 8 is arranged near imaging mechanism 9, and its reflecting surface is an angle towards imaging mechanism 9 and with the light path of imaging mechanism 9;
The angle directive that the light that light source 6 is launched reflects to be not less than the angle of total reflection through the first catoptron 7 gathers face 2-2, in the region that fingers and palms line does not contact with collection face 2-2, experiences total internal reflection, imaging mechanism 9 is entered through the second catoptron 8 reflection, form bright background, and in the region that fingers and palms line contacts with collection face 2-2, due to the generation of frustrated total internal reflection effect, only there is extremely weak scattered beam after the reflection of catoptron group, be imaged mechanism 9 to collect, and then form dark areas (relative with the brightness of bright background); Light source 6 and imaging mechanism 9 move along direction of scanning 10 level of synchronization while the first catoptron 7 and the second catoptron 8 move horizontally, thus complete imaging mechanism 9 to the collection gathering whole fingers and palms line on the 2-2 of face.In this kind of embodiment, the form that the fingers and palms print image collected infers palmmprint with bright background presents.
Particularly, with reference to accompanying drawing 5a, the angular relationship about the light path in second embodiment is described.
For the flat-bed scanning mode of described fingers and palms line imaging system, bright background embodiment as shown in Figure 5 a, works as θ
1>=θ
ctime, be totally reflected at this interface, θ
c=sin
-1(n
0/ n
1).Upper and lower surfaces due to fluid chamber outer wall 2 are parallel, θ
2and θ
1equal.
By θ
2and θ
3relation have Snell law:
n
2sinθ
3＝n
1sinθ
2，
θ
3＝sin
-1[(n
1/n
2)sinθ
2]。
When lighting source incident angle is vertical incidence, incident ray and normal parallel, therefore θ
3with 2 θ
4supplementary angle, then θ
4=90 ° of-θ
3/ 2.The light symmetry of the imaging light after the reflection of collection face and illumination side can determine position and the angle of camera lens.
This enforcement by catoptron group being built in flat fluid chamber 3, and keeps relative to light source 6 and imaging mechanism 9 specifically position and angle, thus ensures to realize frustrated total internal reflection in scanning process.With first embodiment unlike, in the present embodiment, scan mode is not in a rotative pattern, but scans in a linear fashion.The catoptron group of placing in fluid chamber 3 synchronously carries out Linear-moving with the light source 6 in cavity 5 and imaging mechanism 9 under the driving of synchronous drive unit, thus realizes the image acquisition to whole collection face.
Optionally, described light source 6 is connected by gear train the motor that is internal or external at cavity with imaging mechanism 9, controlling motor rotation by controller drives light source 6 and imaging mechanism 9 to realize the Linear-moving in cavity 5, catoptron group is then connected by being formed between magnetic mode with light source 6, drives catoptron group to move when light source 6 and imaging mechanism 9 rectilinear motion by magnetic force.
What preferably adopt in the present embodiment is line scan image sensor, and when tracer rotation system 10 rotates to a certain position, line scan image sensor is only to the range of linearity imaging that incident ray is crossing with gathering face 2-2.Along with the rotation of tracer rotation system 10, controller controls motor and rotates and drive catoptron group, light source 6 and imaging mechanism 9 to realize from gathering one end of face 2-2 to the rectilinear motion of the other end, thus realizes the collection to fingers and palms line whole on collection face.Here, only when the collection face of linear light source 6 and line scan image sensor or array image sensor is enough large (under normal circumstances, actual device can meet required width), fluid chamber inwall 4 only can carry out horizontal direction and move and can complete image acquisition, if but it is large all not, then also need to make light source 6, imaging mechanism 9 and catoptron group are along the paper direction rectilinear motion in vertical view 4 and carry out synchronous acquisition, or adopt 2-4 parallel imaging mechanism 9 to realize widening the vision, or adopt the method reducing optical path length, just can complete the collection of whole fingers and palms line.
With reference to accompanying drawing 6, be the replacement scheme structural representation of fingers and palms line imaging system second embodiment that the utility model provides, this replacement scheme can collect the bright fingers and palms print image of dark background.
With second embodiment unlike, described catoptron group only comprises a catoptron 12; Described catoptron 12 is arranged near imaging mechanism 9, and its reflecting surface is an angle towards imaging mechanism 9 and with the light path of imaging mechanism 9;
The light path near normal fluid chamber outer wall 2 of light source 6 and fluid chamber inwall 4 penetrate, almost vertical sand shooting is to collection face 2-2, in the region that fingers and palms line does not contact with collection face 2-2, directly be transmitted to the external world, do not form reflection ray, imaging mechanism 9 is collected less than reflection ray, and then formation dark background, and in the region that fingers and palms line contacts with collection face 2-2, through the light of outer wall through the scattering of fingers and palms line, some scattered beam, after catoptron 12 reflects, is imaged mechanism 9 and collects, and then forms bright area; Light source 6 and imaging mechanism 9 move along direction of scanning 10 level of synchronization while catoptron 12 moves horizontally, thus complete imaging mechanism 9 to the collection gathering whole fingers and palms line on the 2-2 of face.
With reference to accompanying drawing 6a, describe the angular relationship about the light path in the replacement scheme of second embodiment.
As shown in Figure 6 a, lighting source impinges perpendicularly on collection face to the light path of the dark background embodiment of flat bed scanning, by the light of skin scattering, shooting angle is greater than critical angle time, light that shots arrives forms the image of high-contrast.Identical with in bright background, use angle and the position of Snell law determination catoptron, here no longer repeated description.
Except above-mentioned replacement scheme, second embodiment can also have other replacement scheme, such as, is arranged in fluid chamber 3 by light source 6.
Can imagine, when light source 6 is arranged in fluid chamber 3, the irradiating angle of light source 6 is angle of inclination or vertical angle injection;
Wherein, when light source 6 irradiating angle is for vertically penetrating, the light path vertical liquid cavity outer wall 2 of light source 6 penetrates, in the region that fingers and palms line does not contact with collection face 2-2, directly be transmitted to the external world, do not form reflection ray, imaging mechanism 9 is collected less than reflection ray, and then formation dark background, and in the region that fingers and palms line contacts with collection face 2-2, scattering occurs on fingers and palms line surface transmitted ray, some scattered beam is after catoptron 12 reflects, be imaged mechanism 9 to collect, and then form bright area; Imaging mechanism 9 is synchronizing moving while fluid chamber inwall 4 rotates, thus completes the collection to gathering whole fingers and palms line on the 2-2 of face;
When light source 6 irradiating angle is for tilting to penetrate, the light that light source 6 is launched gathers face 2-2 with the angle directive being not less than the angle of total reflection, in the region that fingers and palms line does not contact with collection face 2-2, experiences total internal reflection, enters imaging mechanism 9 through catoptron 12 reflection, form bright background, and in the region that fingers and palms line contacts with collection face 2-2, due to the generation of frustrated total internal reflection effect, only have extremely weak scattered beam after catoptron 12 reflects, be imaged mechanism 9 to collect, and then form dark areas; Imaging mechanism 9 is synchronizing moving while fluid chamber inwall 4 rotates, thus completes the collection to gathering whole fingers and palms line on the 2-2 of face.
As can be seen from the utility model fingers and palms line imaging system second embodiment and alternate embodiment thereof, the fingers and palms line imaging system that the utility model provides, the flat design of textural employing, by collection face 2-2 being arranged on the upper surface of fluid chamber outer wall 2, catoptron group is built in plate type hydraulic body cavity 3 and imaging mechanism 9 and light source 6 are built in cavity 5, thus achieve the compact of equipment structure, the volume of remarkable reduction equipment.In addition, in fluid chamber 3, filling liquid is with alternative conventional prism, ensure that the dirigibility of catoptron translation, alleviates weight of equipment, reduce production cost.Compared with embodiment 1, the feature in the present embodiment is, global shape is more frivolous, is suitable for being positioned in plane using, more convenient to operate, and meanwhile, scheduling and planning is also simpler.
Compared with prior art, the utility model fingers and palms line imaging system innovation mainly contain following some: the first, by placing the method for optical element in fluid chamber inside, to keep certain incident shooting angle, thus realize the image formation by rays of some special angle.The second, by making the optical element of liquid internal and outside imaging system be synchronized with the movement, realize image scanning.3rd, imaging system is built into collection face inner, reduces with the compact of implement device structure and volume.
Except above-mentioned two embodiments, the utility model also has other replacement schemes.Such as, the catoptron group in fluid chamber, can replace with other optical elements such as special prism, to realize turning back to light path; In addition, in fluid chamber, optical element and scanning system keep synchronous mode also can have following several: 1. can be fixed on support by optical element, and support stretches in cavity, and be connected with scanning driving control system, to keep the synchronous interaction of optical element and scanning system.2. can by optical element be arranged on magnetic bodies, by with the magnetic bodies on cavity interscan driving control system match carry out synchronous.3. can be realized synchronous by gravity.Such as, linear scanning system is holded up with certain angle, under the effect of self gravitation, optical element in fluid chamber, free-falling in fluid chamber, control the scanning system of cavity inside, realize the synchronous interaction with the optical element of free-falling in fluid chamber, and complete scanning in dropping process.After having scanned, by magnetic, optics sorption is retracted fluid chamber top, prepare to carry out image acquisition next time.Compared with first two mode, the advantage of the third mode is that the path repeatability of free-falling is good, can arrange scanning system and follow with this fall trajectory, and debugging is convenient.Shortcoming is the limited angle system in collection face, and before scanning needs optics and scanning system to be pulled up to top.
Those of ordinary skill in the field are to be understood that: the foregoing is only specific embodiment of the utility model, are not limited to the utility model.The utility model can also have other replacement schemes, all within spirit of the present utility model and principle, and any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a fingers and palms line imaging system, it is characterized in that, comprise the fluid chamber outer wall (2) set gradually, the fluid chamber (3) being full of transparency liquid, fluid chamber inwall (4), cavity (5), and be placed in the catoptron group of fluid chamber (3), be placed in the light source (6) in cavity (5) or fluid chamber (3), be placed in the imaging mechanism (9) in cavity (5); Wherein, the outside surface of described fluid chamber outer wall (2) is collection face (2-2), and for contacting with the palm of fingers and palms line to be collected, described fluid chamber outer wall (2) and fluid chamber inwall (4) are transparent material;
Light source (6), keep fixed angle between catoptron group and imaging mechanism (9) and relative position between three is constant, and three can synchronizing moving and imaging mechanism (9) can synchronous acquisition reflected light; Wherein, light path in described imaging system is: the light that described light source (6) is launched above produces total reflection light or frustrated total reflection in the collection face (2-2) contacted with the palm of fingers and palms line to be collected, again after the reflection of catoptron group enters cavity (5), gathered by imaging mechanism (9) and form fingers and palms line.
2. fingers and palms line imaging system according to claim 1, is characterized in that, described imaging mechanism (9) comprises lens or lens combination, and imageing sensor; Described imageing sensor is line scan image sensor or array image sensor.
3. fingers and palms line imaging system according to claim 1, it is characterized in that, the transparency liquid of filling in described fluid chamber (3) is distilled water or oil, and described fluid chamber outer wall (2) and fluid chamber inwall (4) are colourless transparent glass or quartz.
4. fingers and palms line imaging system according to claim 1, is characterized in that, described light source (6) adopts the line source of monochromatic LED or laser or linearly aligned multiple pointolite.
5. the fingers and palms line imaging system according to claim 1-4 any one, it is characterized in that, described fluid chamber outer wall (2) and fluid chamber inwall (4) are hollow cylinder shaped, fluid chamber inwall (4) is placed in fluid chamber outer wall (2) and the two coaxial setting, therebetween form fluid chamber (3), fluid chamber inwall (4) inside is formed as cavity (5);
Fluid chamber inwall (4) can rotate around its central axis, and light source (6), imaging mechanism (9) and catoptron group are all fixedly connected with fluid chamber inwall (4) and rotate along with the rotation of fluid chamber inwall (4).
6. fingers and palms line imaging system according to claim 5, is characterized in that, described catoptron group comprises the first catoptron (7) with the second catoptron (8) and the reflecting surface of the two is relative; Light source (6) is placed in fluid chamber (3);
Described first catoptron (7) is arranged near light source (6), and its reflecting surface is an angle towards light source (6) and with the light path of light source (6); Described second catoptron (8) is arranged near imaging mechanism (9), and its reflecting surface is an angle towards imaging mechanism (9) and with the light path of imaging mechanism (9).
7. fingers and palms line imaging system according to claim 5, is characterized in that, described catoptron group only comprises a catoptron (12); Described catoptron (12) is arranged near imaging mechanism (9), and its reflecting surface is an angle towards imaging mechanism (9) and with the light path of imaging mechanism (9); Described light source (6) is arranged on cavity (5) inside or is arranged in fluid chamber (3); When light source (6) is arranged in fluid chamber (3), the irradiating angle of light source (6) is angle of inclination or vertical angle injection.
8. the fingers and palms line imaging system according to claim 1-4 any one, it is characterized in that, described fluid chamber outer wall (2) and fluid chamber inwall (4) are writing board shape, fluid chamber inwall (4) is placed in fluid chamber outer wall (2) below and the two parallel or less parallel setting, therebetween form fluid chamber (3), fluid chamber inwall (4) below is formed as cavity (5);
Light source (6) can move horizontally in cavity (5) or in fluid chamber (3), imaging mechanism (9) can move horizontally in cavity (5), and catoptron group moves with light source (6) and imaging mechanism (9) level of synchronization in fluid chamber (3).
9. fingers and palms line imaging system according to claim 8, is characterized in that, described catoptron group comprises the first catoptron (7) with the second catoptron (8) and the reflecting surface of the two is relative; Light source (6) is placed in fluid chamber (3);
Described first catoptron (7) is arranged near light source (6), and its reflecting surface is an angle towards light source (6) and with the light path of light source (6); Described second catoptron (8) is arranged near imaging mechanism (9), and its reflecting surface is an angle towards imaging mechanism (9) and with the light path of imaging mechanism (9).
10. fingers and palms line imaging system according to claim 8, is characterized in that, described catoptron group only comprises a catoptron (12); Described catoptron (12) is arranged near imaging mechanism (9), and its reflecting surface is an angle towards imaging mechanism (9) and with the light path of imaging mechanism (9); Described light source (6) is arranged on cavity (5) inside or is arranged in fluid chamber (3); When light source (6) is arranged in fluid chamber (3), the irradiating angle of light source (6) is angle of inclination or vertical angle injection.
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| CN201520158655.1U CN204463160U (en) | 2015-03-19 | 2015-03-19 | Fingers and palms line imaging system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104766050A (en) * | 2015-03-19 | 2015-07-08 | 周飞 | Finger and palm print imaging system |
| CN105844233A (en) * | 2016-03-21 | 2016-08-10 | 京东方科技集团股份有限公司 | Fingerprint identification module, fingerprint identification device and display device |
| TWI761341B (en) * | 2016-05-06 | 2022-04-21 | 美商高通公司 | Biometric system with photoacoustic imaging |
-
2015
- 2015-03-19 CN CN201520158655.1U patent/CN204463160U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104766050A (en) * | 2015-03-19 | 2015-07-08 | 周飞 | Finger and palm print imaging system |
| CN104766050B (en) * | 2015-03-19 | 2018-01-12 | 深圳百迈技术有限公司 | Fingers and palms line imaging system |
| CN105844233A (en) * | 2016-03-21 | 2016-08-10 | 京东方科技集团股份有限公司 | Fingerprint identification module, fingerprint identification device and display device |
| US10157304B2 (en) | 2016-03-21 | 2018-12-18 | Boe Technology Group Co., Ltd. | Fingerprint identification module, fingerprint identification device and display device |
| TWI761341B (en) * | 2016-05-06 | 2022-04-21 | 美商高通公司 | Biometric system with photoacoustic imaging |
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Effective date of registration: 20170215 Address after: 518000 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 A Patentee after: Shenzhen Mai Technology Co., Ltd. Address before: 518000 Guangdong province Shenzhen City Seaview Garden Hong court 15A Patentee before: Zhou Fei |