CN105137572A - Imaging lens, iris imaging module and binocular iris recognition device - Google Patents
Imaging lens, iris imaging module and binocular iris recognition device Download PDFInfo
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Abstract
The invention discloses an imaging lens, an iris imaging module and a binocular iris recognition device. The imaging lens, an iris imaging module and a binocular iris recognition device belong to the field of biological recognition. The imaging lens successively comprises the following components in an optical axis direction from front to back: a first lens which is a biconvex lens with a positive focal power, wherein the front surface and the back surface of the first lens are convex surfaces; a second lens which is a biconcave lens with a negative focal power, wherein the front surface and the back surface of the second lens are recessed surfaces; a third lens which is biconvex lens with a positive focal power, wherein the front surface and the back surface of the third lens are convex surfaces; and a fourth lens which is a biconcave lens with a negative focal power, wherein the front surface and the back surface of the fourth lens are recessed surfaces. The front surface and/or the back surface of each of the first lens, the second lens, the third lens and the fourth lens are aspheric. The imaging lens has advantages of simple structure, small size, high imaging quality and small distortion. The imaging lens is suitable for binocular iris acquisition.
Description
Technical field
The present invention relates to field of biological recognition, refer to a kind of imaging lens, iris imaging module and binocular iris identification device especially.
Background technology
Along with the arrival of Internet information age, people require to improve constantly to the safety and stability of information especially personal information, utilize people's unique physiological characteristic inherently or behavioural characteristic to carry out the application of authentication more and more extensive, wherein iris recognition technology is subject to everybody favor day by day as " the most accurate " and " the most difficult forgery " biological identification technology.But iris recognition is a kind of biological identification technology based on iris textural characteristics, because iris surface is sphere, area is less, color is gloomy, therefore require higher to the optical system imaging quality gathering iris image, how to obtain high-quality, grain details clearly iris image become the difficult problem being badly in need of overcoming.
The optical imaging system of iris identification device large-scale at present generally adopts zoom system, pancreatic system, be made up of tens lens, the physical constructions such as complicated motor of arranging in pairs or groups are focused, its advantage is that coverage is wide, user can carry out iris recognition without the need to specially cooperating equipment, shortcoming is that volume is comparatively large, complicated operation and cost is higher, can only be applied to special occasions and field; And in order to the application of ordinary populace, need the iris identification equipment of more convenient miniaturization, its iris imaging optical system is generally the simple fixed-focus system of structure, the existing monocular that mostly is gathers optical system, the imageing sensor (VGA) of its lower pixel of generally arranging in pairs or groups, its optical texture is simple, only need 2-3 sheet lens just can reach higher image quality, but gather eyes, require high to the fitness of user, and equipment can acquisition range very narrow, extremely inconvenient in use, be unfavorable for hold distance and aim at.
Summary of the invention
The invention provides a kind of imaging lens, iris imaging module and binocular iris identification device, this imaging lens structure is simple, and volume is little; Good imaging quality, distorts little; Be applicable to binocular iris capturing.
For solving the problems of the technologies described above, the invention provides technical scheme as follows:
A kind of imaging lens, comprises from front to back successively along optical axis direction:
First lens, described first lens are the biconvex lens with positive light coke, and its front surface is convex surface, and rear surface is convex surface;
Second lens, described second lens are the biconcave lens with negative power, and its front surface is concave surface, and rear surface is concave surface;
3rd lens, described 3rd lens are the biconvex lens with positive light coke, and its front surface is convex surface, and rear surface is convex surface;
4th lens, described 4th lens are the biconcave lens with negative power, and its front surface is concave surface, and rear surface is concave surface;
Front surface and/or the rear surface of described first lens, the second lens, the 3rd lens and the 4th lens are aspheric surface.
A kind of iris imaging module, comprise above-mentioned arbitrary imaging lens and be positioned at the imageing sensor at described imaging lens rear, described imageing sensor is CCD or cmos sensor.
A kind of binocular iris identification device, the hardware circuit comprising above-mentioned iris imaging module and be connected with described iris imaging module.
The present invention has following beneficial effect:
Compared with prior art, imaging lens of the present invention is made up of four non-spherical lenses, is followed successively by biconvex lens, biconcave lens, biconvex lens and biconcave lens from front to back along optical axis direction, structure is simple, volume is little, is suitable for compact apparatus, especially mobile portable equipment; This imaging lens has higher image quality at near-infrared band, distorts little; The present invention can arrange in pairs or groups high element sensor (3-5 1,000,000), gathers binocular iris image clearly simultaneously.
Therefore imaging lens structure of the present invention is simple, volume is little; Good imaging quality, distorts little; Be applicable to binocular iris capturing.
Accompanying drawing explanation
Fig. 1 is the structural representation of imaging lens of the present invention;
Fig. 2 is the structural representation of imaging lens embodiment one of the present invention;
The optical performance curve figure that Fig. 3 is imaging lens shown in Fig. 2, wherein: 3A is the curvature of field curve map of embodiment one; 3B is the distortion curve figure of embodiment one; 3C is the MTF performance diagram of embodiment one;
Fig. 4 is the structural representation of imaging lens embodiment two of the present invention;
The optical performance curve figure that Fig. 5 is imaging lens shown in Fig. 4, wherein: 5A is the curvature of field curve map of embodiment two; 5B is the distortion curve figure of embodiment two; 5C is the MTF performance diagram of embodiment two.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
On the one hand, the invention provides a kind of imaging lens, as shown in Figure 1, comprise successively from front to back along optical axis direction:
First lens 1, first lens 1 are for having the biconvex lens of positive light coke, and its front surface 11 is convex surface, and rear surface 12 is convex surface;
Second lens 2, second lens 2 are for having the biconcave lens of negative power, and its front surface 21 is concave surface, and rear surface 22 is concave surface;
3rd lens the 3, three lens 3 are for having the biconvex lens of positive light coke, and its front surface 31 is convex surface, and rear surface 32 is convex surface;
4th lens the 4, four lens 4 are for having the biconcave lens of negative power, and its front surface 41 is concave surface, and rear surface 42 is concave surface;
First lens 1, second lens 2, the 3rd lens 3 and the 4th lens 4 are non-spherical lens, its front surface and rear surface at least one be aspheric surface.
This term of non-spherical lens includes any lens not belonging to sphere, but we to use herein during this term be in the subset specifically talking about non-spherical lens, namely there is radius-of-curvature and its radius can present the radial Rotational Symmetry optical element changed by lens center.Non-spherical lens can improve picture quality, the number of elements needed for minimizing, reduces the cost of optical design simultaneously.From digital camera and CD Player, to high-end micro objective and fluorescent microscope, no matter non-spherical lens is at optics, which aspect of imaging or photonics industry, its application development is all very fast, this is because compare traditional spherical optics element, non-spherical lens has various uniqueness significant advantage again: non-spherical lens has better radius-of-curvature, good lens error correction can be maintained, to obtain required performance, the application of non-spherical lens, bring outstanding acutance and the resolution of Geng Gao, the Miniaturization Design of camera lens becomes possibility simultaneously.
The traditional definition of non-spherical lens (is defined by surface profile (sag)) as shown in equation 1:
Wherein:
Z=is parallel to the surface profile on the surface of optical axis;
Radial distance between s=and optical axis;
C=curvature, the inverse of radius;
K=circular cone coefficient;
A4, A6, A8...=the 4th, 6,8 ... secondary asphericity coefficient;
When asphericity coefficient is equal to zero time, the non-spherical surface drawn just is equal to a circular cone.Following table shows, and the actual conical surface produced will depend on value size and the sign symbol of circular cone coefficient.
Table one: the relation of circular cone coefficient and conical surface type
| Circular cone coefficient | Conical surface type |
| k＝0 | Sphere |
| k>-1 | Oval |
| k＝-1 | Parabola |
| k<-1 | Hyperboloid |
The geometric properties that non-spherical lens shows unique characteristics most is exactly that change can appear in its radius-of-curvature along with the distance between optical axis, and in comparison, the radius of sphere is all constant all the time.This special shape allows non-spherical lens to provide compared to standard spherical face and the optical property of Yan Genggao.
Compared with prior art, imaging lens of the present invention is made up of four non-spherical lenses, is followed successively by biconvex lens, biconcave lens, biconvex lens and biconcave lens from front to back along optical axis direction, structure is simple, volume is little, is suitable for compact apparatus, especially mobile portable equipment; This imaging lens has higher image quality at near-infrared band, distorts little; The present invention can arrange in pairs or groups high element sensor (3-5 1,000,000), gathers binocular iris image (certainly, also may be used for completely gathering monocular iris image) clearly simultaneously.
Therefore imaging lens structure of the present invention is simple, volume is little; Good imaging quality, distorts little; Be applicable to binocular iris capturing.
As a modification of the present invention, the focal length of each lens can meet: 0.5≤f1/f≤0.7 ,-0.85≤f4/f≤-0.53,0.65≤f/TTL≤0.8; F is the focal length of imaging lens, and f1 is the focal length of the first lens, and f4 is the focal length of the 4th lens, and TTL is the length of imaging lens.The focal distance f 2 of the second lens and the focal distance f 3 of the 3rd lens very little on the impact of imaging lens, therefore it not to be limited.
When the focal length of each lens meets above-mentioned relation, at near-infrared band, there is higher image quality, almost undistorted.
Preferably, 6.4mm≤f≤6.6mm, 3.2mm≤f1≤4.62mm ,-5.61mm≤f4≤-3.392mm, 8mm≤TTL≤10.15mm.
Improve as another kind of the present invention, the material of the first lens, the second lens, the 3rd lens and the 4th lens meets: 1.5≤nd1≤1.6,1.5≤nd2≤1.6,1.5≤nd3≤1.6,1.5≤nd4≤1.6, vd1 >=55, vd2≤35, vd3 >=55, vd4 >=55; Nd1 and vd1 is refractive index and the abbe number of the first lens respectively, nd2 and vd2 is refractive index and the abbe number of the second lens respectively, nd3 and vd3 is refractive index and the abbe number of the 3rd lens respectively, nd4 and vd4 is refractive index and the abbe number of the 4th lens respectively.Adopt the material of above-mentioned refractive index and abbe number can either obtain good image quality, can material cost be saved again.
Preferably, as shown in Figure 1, Figure 2 and Figure 4, the first lens 1 front end is provided with diaphragm 5 for controlling near infrared light percent of pass (5 ' or 5 ").Diaphragm can regulate the power of the near infrared light beam passed through, and can select different diaphragms under different photoenvironments.
Improve as another kind of the present invention, can be coated with on certain surface of certain lens can reflect visible light through the filter coating (as near-infrared band narrow-band-filter film) of near infrared light, be preferably coated with filter coating at the front surface of the first lens; Filter coating can avoid visible ray to the interference of imaging lens, and meanwhile, the visible ray of reflection can make user from imaging lens, see the eyes image of self, facilitates user to regulate self-position, plays the effect of location.And front surface and the rear surface of the rear surface of the first lens and the second lens, the 3rd lens and the 4th lens are all coated with the near-infrared band anti-reflection film that can strengthen near infrared light transmitance.Anti-reflection film can strengthen the transmitance of near infrared light, can obtain iris image more clearly with less emissive power.
Or, as shown in Figure 4, imaging lens also comprise can reflect visible light and through the optically flat filter 7 of near infrared light ", optically flat filter can be positioned at whole imaging lens foremost or rearmost end; preferably rearmost end, and optically flat filter can avoid visible ray to the interference of imaging lens; Front surface and the rear surface of the first lens, the second lens, the 3rd lens and the 4th lens are all coated with the near-infrared band anti-reflection film that can strengthen near infrared light transmitance.Anti-reflection film can strengthen the transmitance of near infrared light, can obtain iris image more clearly with less emissive power.
In the present invention, the wave band of above-mentioned near infrared light is 700-900nm.The near infrared light of this wave band can collect the iris image of better quality.
For further cost-saving, the material of the first lens, the second lens, the 3rd lens and the 4th lens can be plastics.
With two specific embodiments, the present invention will be further elaborated below:
Embodiment one:
The present embodiment is a kind of imaging lens for binocular iris recognition, as shown in Figure 2, be made up of four lens combination and diaphragm 5 ', the rear of imaging lens is provided with imageing sensor 6 ', be followed successively by along optical axis direction: diaphragm 5 ', the first lens 1 ' are biconvex lens, its front surface 11 ' is convex surface, rear surface 12 ' is convex surface, has positive focal power; Second lens 2 ' are biconcave lens, and its front surface 21 ' is concave surface, and rear surface 22 ' is right concave surface, has negative focal power; 3rd lens 3 ' are biconvex lens, and its front surface 31 ' is convex surface, and rear surface 32 ' is convex surface, has positive focal power; 4th lens 4 ' are biconcave lens, and its front surface 41 ' is concave surface, and rear surface 42 ' is concave surface, has negative focal power; Imaging surface and imageing sensor face, adopt CCD or Cmos sensor.Four lens are even non-spherical lens, and its material is plastic material.The imaging lens imaging wavelength of the present embodiment is near-infrared band 700-900nm, for avoiding the interference of other light when ensureing imaging, four lens one side plating near-infrared band narrow-band-filter films, preferably the first lens front surface, mirror feedback effect is played while realizing the effect of filtering visible light-transmissive near infrared light, can make user from imaging lens, see the eyes image of self, facilitate user to regulate self-position, play the effect of location.Other plated surface near-infrared band anti-reflection films of four lens
The imaging lens design parameter of the present embodiment refers to table two, table three, comprises the surface type of lens face, radius-of-curvature, lens thickness, material, circular cone coefficient and asphericity coefficient.The present embodiment design parameter is: the focal distance f=6.6mm of imaging lens, the focal length of four lens: f1=4.2mm, f2=-3.5mm, f3=4.4mm, f4=-5mm, (TTL is whole imaging lens optical system overall length to the length TTL=8.5mm of imaging lens, namely the first lens center point is to the distance of imaging surface), refractive index and the abbe number of four lens are respectively: nd1=1.5318, vd1=56.0, nd2=1.583, vd2=30.0, nd3=1.5318, vd3=56.0, nd4=1.5318, vd4=56.0.
Table two: the design parameter of each element of embodiment one
Table three: the aspheric surface high-order term coefficient of each lens of embodiment one
Table three floating coat refers to near-infrared band narrow-band-filter film, and I.98 (IR) represents that the transmitance of near infrared light is at least 98%.
Fig. 3 is the curvature of field curve map (mm) that the optical performance curve figure of embodiment one, 3A show the present embodiment, and within the scope of full filed, the curvature of field aberration of meridian ellipse and each light of sagittal surface is all less than 0.03mm; 3B shows the distortion curve figure (%) of the present embodiment, and within the scope of full filed, distortion aberration is all in 0.6% scope; 3C shows the MTF curve of the present embodiment, and as seen from the figure now in the ultimate value of spatial frequency 150lp/mm place MTF close to system, within the scope of full filed, MTF is more than 0.5; As can be seen from above optical indicatrix figure, the imaging lens of the present embodiment has higher image quality.
Embodiment two:
The present embodiment is a kind of imaging lens for binocular iris recognition, as shown in Figure 4, by four lens combination, diaphragm 5 " and optically flat filter 7 " form, the rear of imaging lens is provided with imageing sensor 6 "; be followed successively by along optical axis direction: diaphragm 5 ", the first lens 1 " be biconvex lens, its front surface 11 " be convex surface, rear surface 12 " be convex surface, there is positive focal power; Second lens 2 " be biconcave lens, its front surface 21 " be concave surface, rear surface 22 " be concave surface, there is negative focal power; 3rd lens 3 " be biconvex lens, its front surface 31 " be convex surface, rear surface 32 " be convex surface, there is positive focal power; 4th lens 4 " be biconcave lens, its front surface 41 " be concave surface, rear surface 42 " be concave surface, there is negative focal power; Optically flat filter 7 " be positioned at the 4th lens 4 " and imageing sensor 6 " between, imaging surface and imageing sensor face, adopt CCD or Cmos sensor.Four lens are even non-spherical lens, and its material is plastic material.The imaging lens imaging wavelength of the present embodiment is near-infrared band 700-900nm, four lens every face plating near-infrared band anti-reflection films, for avoiding the interference of other light when ensureing imaging, increase optically flat filter 7 " carry out filtering, filtering visible light-transmissive near infrared light.
The imaging lens design parameter of the present embodiment refers to table four, table five, comprises the surface type of lens face, radius-of-curvature, lens thickness, material, circular cone coefficient and asphericity coefficient.The present embodiment design parameter is: the focal distance f=6.4mm of imaging lens, the focal length of four lens respectively: f1=3.85mm, f2=-4mm, f3=4.1mm, f4=-4.8mm, the length TTL=8.7mm of imaging lens, four index of refraction in lens and abbe number are respectively: nd1=1.5318, vd1=56.0, nd2=1.583, vd2=30.0, nd3=1.5318, vd3=56.0, nd4=1.5318, vd4=56.0.
Table four: the design parameter of each element of embodiment two
Table five: the aspheric surface high-order term coefficient of each lens of embodiment two
| Face sequence number | A4 | A6 | A8 | A10 | A12 |
| 11” | -5.3228E-04 | -2.3270E-03 | -7.9858E-04 | 0 | 0 |
| 12” | 7.8915E-03 | -2.6319E-03 | -8.4916E-04 | 0 | 0 |
| 21” | 0 | 0 | 0 | 0 | 0 |
| 22” | -9.8789E-03 | 6.6599E-04 | -2.6995E-04 | 0 | 0 |
| 31” | -3.9309E-03 | 4.8272E-04 | -3.6819E-04 | 0 | 0 |
| 32” | -6.7758E-03 | 4.3281E-03 | -7.1011E-04 | 2.2018E-05 | 8.3356E-06 |
| 41” | 2.0105E-02 | -2.5698E-03 | 1.8102E-04 | 3.7383E-05 | -1.0645E-05 |
| 42” | 1.3272E-02 | -4.9789E-03 | 1.2760E-04 | 8.6398E-05 | -1.2213E-05 |
Fig. 5 is the optical performance curve figure of the present embodiment imaging lens, and wherein: 5A shows the curvature of field curve map (mm) of the present embodiment, within the scope of full filed, the curvature of field aberration of meridian ellipse and each light of sagittal surface is all less than 0.08mm; 5B shows the distortion curve figure (%) of the present embodiment, and within the scope of full filed, distortion aberration is all in 0.6% scope; 5C shows the MTF curve of the present embodiment, and as seen from the figure now in the ultimate value of spatial frequency 150lp/mm place MTF close to system, within the scope of full filed, MTF is more than 0.5; As can be seen from above optical indicatrix figure, the imaging lens of the present embodiment has higher image quality.
On the other hand, the invention provides a kind of iris imaging module, as shown in Figure 2 and Figure 4, comprise above-mentioned arbitrary imaging lens and be positioned at the imageing sensor 6 ' (6 ") at this imaging lens rear, and this imageing sensor 6 ' (6 ") be CCD or cmos sensor.Iris imaging modular structure of the present invention is simple, and volume is little; Good imaging quality, distorts little.
Again on the one hand, the invention provides a kind of binocular iris identification device, this binocular iris identification device is preferably compact apparatus, especially mobile portable equipment, wraps the hardware circuit stated iris imaging module and be connected with this iris imaging module.Binocular iris identification device structure of the present invention is simple, and volume is little; Good imaging quality, distorts little.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an imaging lens, is characterized in that, comprises successively from front to back along optical axis direction:
First lens, described first lens are the biconvex lens with positive light coke, and its front surface is convex surface, and rear surface is convex surface;
Second lens, described second lens are the biconcave lens with negative power, and its front surface is concave surface, and rear surface is concave surface;
3rd lens, described 3rd lens are the biconvex lens with positive light coke, and its front surface is convex surface, and rear surface is convex surface;
4th lens, described 4th lens are the biconcave lens with negative power, and its front surface is concave surface, and rear surface is concave surface;
Front surface and/or the rear surface of described first lens, the second lens, the 3rd lens and the 4th lens are aspheric surface.
2. imaging lens according to claim 1, is characterized in that, 0.5≤f1/f≤0.7 ,-0.85≤f4/f≤-0.53,0.65≤f/TTL≤0.8; F is the focal length of described imaging lens, and f1 is the focal length of the first lens, and f4 is the focal length of the 4th lens, and TTL is the length of described imaging lens.
3. imaging lens according to claim 2, is characterized in that, 6.4mm≤f≤6.6mm, 3.2mm≤f1≤4.62mm ,-5.61mm≤f4≤-3.392mm, 8mm≤TTL≤10.15mm.
4. imaging lens according to claim 1, it is characterized in that, the material of described first lens, the second lens, the 3rd lens and the 4th lens meets: 1.5≤nd1≤1.6,1.5≤nd2≤1.6,1.5≤nd3≤1.6,1.5≤nd4≤1.6, vd1 >=55, vd2≤35, vd3 >=55, vd4 >=55; Nd1 and vd1 is refractive index and the abbe number of described first lens respectively, nd2 and vd2 is refractive index and the abbe number of described second lens respectively, nd3 and vd3 is refractive index and the abbe number of described 3rd lens respectively, nd4 and vd4 is refractive index and the abbe number of described 4th lens respectively.
5. the imaging lens according to the arbitrary claim of claim 1-4, is characterized in that, described first lens front is provided with the diaphragm for controlling near infrared light percent of pass.
6. imaging lens according to claim 5, is characterized in that, the front surface of described first lens is coated with can reflect visible light through the filter coating of near infrared light; Front surface and the rear surface of the rear surface of described first lens and described second lens, the 3rd lens and the 4th lens are all coated with the near-infrared band anti-reflection film that can strengthen near infrared light transmitance.
7. imaging lens according to claim 5, is characterized in that, described imaging lens also comprises can reflect visible light through the optically flat filter of near infrared light; Front surface and the rear surface of described first lens, the second lens, the 3rd lens and the 4th lens are all coated with the near-infrared band anti-reflection film that can strengthen near infrared light transmitance.
8. imaging lens according to claim 5, is characterized in that, the material of described first lens, the second lens, the 3rd lens and four lens is plastics.
9. an iris imaging module, is characterized in that, comprise the imaging lens described in the arbitrary claim of claim 1-8 and be positioned at the imageing sensor at described imaging lens rear, described imageing sensor is CCD or cmos sensor.
10. a binocular iris identification device, is characterized in that, the hardware circuit comprising iris imaging module according to claim 9 and be connected with described iris imaging module.
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| CN105137572B (en) | 2017-07-28 |
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Address after: 100085, 1 floor 8, 1 Street, ten Street, Haidian District, Beijing. Patentee after: Beijing Eyes Intelligent Technology Co.,Ltd. Address before: 100085, 1 floor 8, 1 Street, ten Street, Haidian District, Beijing. Patentee before: BEIJING TECHSHINO TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20220316 Address after: 071800 Beijing Tianjin talent home (Xincheng community), West District, Xiongxian Economic Development Zone, Baoding City, Hebei Province Patentee after: BEIJING EYECOOL TECHNOLOGY Co.,Ltd. Patentee after: Beijing Eyes Intelligent Technology Co.,Ltd. Address before: 100085, 1 floor 8, 1 Street, ten Street, Haidian District, Beijing. Patentee before: Beijing Eyes Intelligent Technology Co.,Ltd. |
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Denomination of invention: Imaging lens, iris imaging module and binocular iris recognition device Effective date of registration: 20220614 Granted publication date: 20170728 Pledgee: China Construction Bank Corporation Xiongxian sub branch Pledgor: BEIJING EYECOOL TECHNOLOGY Co.,Ltd. Registration number: Y2022990000332 |