CN105137567B - Imaging lens, iris imaging module and iris identification device - Google Patents
Imaging lens, iris imaging module and iris identification device Download PDFInfo
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- CN105137567B CN105137567B CN201510494315.0A CN201510494315A CN105137567B CN 105137567 B CN105137567 B CN 105137567B CN 201510494315 A CN201510494315 A CN 201510494315A CN 105137567 B CN105137567 B CN 105137567B
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Abstract
The invention discloses a kind of imaging lens, iris imaging module and iris identification device, belong to field of biological recognition, imaging lens include successively from front to back along light incident direction：First lens, the first lens are the biconvex lens with positive light coke, and its preceding surface is convex surface, and rear surface is convex surface；Second lens, the second lens are the meniscus with positive light coke, and its preceding surface is convex surface, and rear surface is concave surface；3rd lens, the 3rd lens are the meniscus with negative power, and its preceding surface is convex surface, and rear surface is concave surface；4th lens, the 4th lens are the meniscus with positive light coke, and its preceding surface is convex surface, and rear surface is concave surface；5th lens, the 5th lens are the biconvex lens with positive light coke, and its preceding surface is convex surface, and rear surface is convex surface；4th lens and the 5th lens are glued together.The imaging lens good imaging quality of the present invention, acquisition range is wide, easy to use, simple in construction, easy to assembly, low cost.
Description
Technical field
The present invention relates to field of biological recognition, a kind of imaging lens, iris imaging module and iris recognition are particularly related to
Device.
Background technology
Iris recognition is that a kind of iris texture information based on less than 10mm regions is handled come certification user's body
Part biological identification technology, the technology to realize that difficult point is how to collect clear high-quality iris image i.e. high-quality
Iris image acquiring optical system.Current existing iris capturing optical system can be divided into：Varifocal optical system and focus optics
System, wherein varifocal optical system volume are big, complicated, cost is high, and assembly difficulty is big；Focus optical system structure simple,
Low cost, device is convenient, and general use of product at present on the market focuses optical system, but the existing optical system that focuses is generally
Monocular gathers optical system, imaging sensor (VGA) of its general collocation compared with low pixel.
But gather an eyes, high required to the fitness of user, and equipment can acquisition range (depth of field) it is very narrow, using
When it is extremely inconvenient, be unfavorable for hold distance and alignment.
The content of the invention
The present invention provides a kind of imaging lens, iris imaging module and iris identification device, and the lens imaging quality is good,
Acquisition range is wide, easy to use, simple in construction, easy to assembly, low cost.
In order to solve the above technical problems, present invention offer technical scheme is as follows：
A kind of imaging lens, include successively from front to back along light incident direction：
First lens, first lens are the biconvex lens with positive light coke, and its preceding surface is convex surface, and rear surface is
Convex surface；
Second lens, second lens are the meniscus with positive light coke, and its preceding surface is convex surface, and rear surface is
Concave surface；
3rd lens, the 3rd lens are the meniscus with negative power, and its preceding surface is convex surface, and rear surface is
Concave surface；
4th lens, the 4th lens are the meniscus with positive light coke, and its preceding surface is convex surface, and rear surface is
Concave surface；
5th lens, the 5th lens are the biconvex lens with positive light coke, and its preceding surface is convex surface, and rear surface is
Convex surface；
4th lens and the 5th lens are glued together.
A kind of iris imaging module, including any of the above-described imaging lens and the image positioned at the imaging lens rear
Sensor, described image sensor is CCD or cmos sensor.
A kind of iris identification device, including above-mentioned iris imaging module and the hardware that is connected with the iris imaging module
Circuit.
The invention has the advantages that：
Compared with prior art, imaging lens of the invention are followed successively by along vertical five lens of light incident direction
Biconvex lens, meniscus, meniscus, meniscus and biconvex lens, wherein the 4th lens and the 5th lens are glued at
Together.The imaging lens have higher image quality near infrared band, distort small；Field depth is wide, and object distance range is big, makes
Obtain acquisition range wide；Present invention is particularly suitable for binocular iris capturing, low is required to the fitness of user, it is easy to use；Five
Lens are spherical lens, without non-spherical lens, simple in construction, easy to assembly, low cost.
Brief description of the drawings
Fig. 1 is the structural representation of the imaging lens of the present invention；
Fig. 2 is the structural representation of the imaging lens embodiment one of the present invention；
Fig. 3 is the optical performance curve figure of imaging lens shown in Fig. 2, wherein：3A is the distortion curve figure of embodiment one；3B
For the curvature of field curve map of embodiment one；3C is the MTF performance diagrams one of embodiment one；3D is bent for the MTF characteristics of embodiment one
Line chart two；3E is the MTF performance diagrams three of embodiment one；
Fig. 4 is the structural representation of the imaging lens embodiment two of the present invention；
Fig. 5 is the optical performance curve figure of imaging lens shown in Fig. 4, wherein：5A is the distortion curve figure of embodiment two；5B
For the curvature of field curve map of embodiment two；5C is the MTF performance diagrams one of embodiment two；5D is bent for the MTF characteristics of embodiment two
Line chart two；5E is the MTF performance diagrams three of embodiment two.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
On the one hand, the present invention provides a kind of imaging lens, as shown in figure 1, being wrapped successively from front to back along light incident direction
Include：
First lens 1, the first lens 1 are the biconvex lens with positive light coke, and its preceding surface 11 is convex surface, rear surface 12
For convex surface；
Second lens 2, the second lens 2 are the meniscus with positive light coke, and its preceding surface 21 is convex surface, rear surface 22
For concave surface；
3rd lens 3, the 3rd lens 3 are the meniscus with negative power, and its preceding surface 31 is convex surface, rear surface 32
For concave surface；
4th lens 4, the 4th lens 4 are the meniscus with positive light coke, and its preceding surface 41 is convex surface, rear surface 42
For concave surface；
5th lens 5, the 5th lens 5 are the biconvex lens with positive light coke, and its preceding surface 51 is convex surface, rear surface 52
For convex surface；
4th lens 4 and the 5th lens 5 are glued together, and 42 and 51 be same face in Fig. 1, marked as 42/51.
The preceding surface of each above-mentioned lens refers to the face that infrared light is injected, and rear surface refers to the face that infrared light is projected, similarly hereinafter.
Compared with prior art, imaging lens of the invention are followed successively by along vertical five lens of light incident direction
Biconvex lens, meniscus, meniscus, meniscus and biconvex lens, wherein the 4th lens and the 5th lens are glued at
Together.The imaging lens have higher image quality near infrared band, distort small；Field depth is wide, and object distance range is big, makes
Obtain acquisition range wide；Present invention is particularly suitable for binocular iris capturing, low is required to the fitness of user, it is easy to use；Five
Lens are spherical lens, without non-spherical lens, simple in construction, easy to assembly, low cost.
As a modification of the present invention, the focal length of each lens can be met：1.8f≤f1≤2.3f, 0.45f≤f2
≤ 1.1f, -0.55f≤f3≤- 0.33f, 1.05f≤f4≤1.35f, 0.9f≤f5≤1.67f；Wherein, f is imaging lens
Total focal length, f1 is first focal length of lens, and f2 is second focal length of lens, and f3 is the 3rd focal length of lens, and f4 is the 4th focal length of lens, f5
For the 5th focal length of lens.
When the focal length of each lens meets above-mentioned relation, there is higher image quality near infrared band, almost without
Distortion.
Further, 17mm≤f1≤21mm, 4mm≤f2≤9.5mm, -5mm≤f3≤- 3mm, 9.5mm≤f4≤
12mm, 8mm≤f5≤15mm；200mm≤h≤400mm, Δ h >=110mm；Wherein, h is object distance, and Δ h is object space field depth,
The farthest shooting distance of Δ h=object spaces-object space minimum photographic distance.Now, imaging lens are applicable to double in the range of 20-40cm
Mesh iris image acquiring, with larger object space field depth.
It is used as another improvement of the present invention, the first lens 1, the second lens 2, the 3rd lens 3, the 4th lens 4 and the 5th
The material of lens 5 is met：1.6≤nd≤1.8,25≤vd≤55, wherein, nd is the refractive index of lens material, and vd is lens material
The abbe number of matter.Preferable image quality can be accessed using above-mentioned refractive index and the material of abbe number, and can be saved
Material cost.
It is preferred that, as shown in Figure 1, Figure 2 and Figure 4, it is provided between the 3rd lens 3 and the 4th lens 4 near red for controlling
The diaphragm 6 (6 ', 6 ") of outer smooth percent of pass.Diaphragm can be adjusted under the power of the near-infrared light beam passed through, different photoenvironments
Different diaphragms can be selected.
As another improvement of the present invention, can be coated with some surface of some lens can reflect visible ray and pass through
The filter coating (such as near infrared band narrow-band-filter film) of near infrared light, is preferably coated with filter coating on the preceding surface of the first lens；Filter
Light film can avoid interference of the visible ray to imaging lens, meanwhile, the visible ray of reflection can make user from imaging lens
To the eyes image of itself, facilitate user to adjust self-position, play a part of positioning.And the rear surface of the first lens and
Second lens, the 3rd lens, the preceding surface and rear surface of the 4th lens and the 5th lens, which are coated with, can strengthen near infrared light transmission
The near infrared band anti-reflection film of rate.Anti-reflection film can strengthen the transmitance of near infrared light, can be obtained with less transmission power
More visible iris image.
Or, as shown in figure 4, imaging lens also include that visible ray can be reflected and through the optically flat filter of near infrared light
7 ", optically flat filter can be located at whole imaging lens foremost or rearmost end, preferably rearmost end, and optically flat filter can be avoided
Interference of the visible ray to imaging lens；First lens, the second lens, the 3rd lens, the preceding surface of the 4th lens and the 5th lens
And rear surface is coated with can strengthen the near infrared band anti-reflection film of near infrared light transmitance.Anti-reflection film can strengthen near infrared light
Transmitance, can obtain more visible iris image with less transmission power.
In the present invention, the wave band of above-mentioned near infrared light is 700-900nm.The near infrared light of the wave band can collect higher
The iris image of quality.
To be further cost-effective, the first lens, the second lens, the 3rd lens, the material of the 4th lens and the 5th lens
Matter can be glass.
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 Fig. 2 by five lens groups and light
Door screen 6 ' is constituted, and the rear of imaging lens is provided with imaging sensor 8 ', is followed successively by along light incident direction：With positive light coke
First lens 1 ', it is biconvex lens, and its preceding surface 11 ' is convex surface, and rear surface 12 ' is convex surface；Second with positive light coke
Lens 2 ', it is meniscus, and its preceding surface 21 ' is convex surface, and rear surface 22 ' is concave surface；The 3rd lens with negative power
3 ', it is meniscus, and its preceding surface 31 ' is convex surface, and rear surface 32 ' is concave surface；4th lens 4 ' and the 5th lens 5 ' are glue
Mirror is closed, the 4th lens 4 ' are the meniscus with positive light coke, and its preceding surface 41 ' is convex surface, and rear surface 42 ' is concave surface；The
Five lens 5 ' are the biconvex lens with positive light coke, and its preceding surface 51 ' is convex surface, and rear surface 52 ' is convex surface；Diaphragm 6 ' is located at
Between 3rd lens 3 ' and the 4th lens 4 ', five lens are glass material；Imaging surface is imaging sensor face, and it is CCD
Or cmos sensor.
The imaging lens imaging wavelength of the present embodiment is near infrared band 700-900nm, to ensure during imaging from other
The interference of light, in certain one side plating near infrared band narrow-band-filter film of some lens, realization filters out visible light-transmissive near-infrared
The effect of light, preferably plates near infrared band narrow-band-filter film on the preceding surface of the first lens, and filter coating can avoid visible ray pair
The interference of imaging lens, meanwhile, the visible ray of reflection can make user see the eyes image of itself from imaging lens, convenient
User adjusts self-position, plays a part of positioning.And be the transmitance of increase near infrared band light, every other each face plating
There is near-infrared anti-reflection film.
As aperture FNO.=5, (FNO. is focal length and the ratio of effective aperture to the imaging lens of the present embodiment, for describing light
The size of circle), when optimal focusing object distance is 300mm, concrete structure parameter refers to table one, includes surface type, the song of lens face
Rate radius, lens thickness, refractive index, abbe number etc..The focal length of lens parameter of the present embodiment optical system is：First lens are burnt
Away from f1=19.5mm, the second focal length of lens f2=7.3mm, the 3rd focal length of lens f3=-4.4mm, the 4th focal length of lens f4=
11.5mm the 5th focal length of lens f5=12.1mm, Δ h=110mm, can gather clear binocular iris figure in the range of 250-360mm
Picture, the binocular iris image acquiring for relative broad range.
Table one：The concrete structure parameter of embodiment one of the imaging lens of the present invention
Fig. 3 is the optical performance curve figure of the present embodiment imaging lens, and 3A shows the distortion curve figure (%) of the present embodiment,
In the range of full filed, distortion aberration is in the range of 0.5%；3B shows the curvature of field curve map (mm) of the present embodiment, is regarding entirely
In the range of, the curvature of field aberration of meridian plane and each light of sagittal surface is respectively less than 0.05mm；3C shows the MTF of the embodiment of the present invention
(Modulation Transfer Function, modulation transfer function) characteristic curve, finds out in object distance 300mm from curve,
The MTF of each visual field is close to diffraction limit, and mtf value is more than 0.4 at spatial frequency 100lp/mm；The 3D display present invention is implemented
MTF curve of the example in object distance 250mm, as seen from the figure now at spatial frequency 100lp/mm mtf value 0.3 or so；3E
MTF curve of the embodiment of the present invention in object distance 360mm is shown, as seen from the figure the now MTF at spatial frequency 100lp/mm
Value is 0.3 or so；The imaging lens distortion of the present embodiment is small it can be seen from above optical indicatrix figure, with higher
Image quality, and field depth is wide.
Embodiment two：
The present embodiment is a kind of imaging lens for binocular iris recognition, as shown in figure 4, by five lens groups, diaphragms
6 " and optically flat filter 7 " constitute, the rear of imaging lens is provided with imaging sensor 8 ", is followed successively by along light incident direction：
The first lens 1 " with positive light coke, it is biconvex lens, and its preceding surface 11 " is convex surface, and rear surface 12 " is convex surface；Have
Second lens 2 " of positive light coke, it is meniscus, and its preceding surface 21 " is convex surface, and rear surface 22 " is concave surface；With negative light
3rd lens 3 " of focal power, it is meniscus, and its preceding surface 31 " is convex surface, and rear surface 32 " is concave surface；4th lens 4 " and
5th lens 5 " are glued mirror, and the 4th lens 4 " are the meniscus with positive light coke, and its preceding surface 41 " is convex surface, rear table
Face 42 " is concave surface；5th lens 5 " are the biconvex lens with positive light coke, and its preceding surface 51 " is convex surface, and rear surface 52 " is
Convex surface；Diaphragm 6 " is located between the 3rd lens 3 " and the 4th lens 4 ", and five lens are glass material；Imaging surface passes for image
Sensor face, it is CCD or cmos sensor.
The imaging lens imaging wavelength of the present embodiment is near infrared band 700-900nm, is filtered out using optically flat filter 7 "
Light disturbance, the preceding surface of optically flat filter 7 " is 71 ", and rear surface is 72 ", the material of optically flat filter 7 " meet 1.4≤nd≤
1.6,60≤vd≤70, optically flat filter 7 " can be located at whole imaging lens foremost or rearmost end, and preferably rearmost end is to be located at
Between 5th lens 5 " and imaging sensor 8 ", it is near infrared band narrow band pass filter, is 700-900nm through wavelength.Respectively
The preceding surface and rear surface of individual lens are coated near infrared band anti-reflection film, strengthen the transmitance of near infrared band light.
As aperture FNO.=5.1, (FNO. is focal length and the ratio of effective aperture to the imaging lens of the present embodiment, for describing light
The size of circle), when optimal focusing object distance is 300mm, concrete structure parameter refers to table two, includes surface type, the song of lens face
Rate radius, lens thickness, refractive index, abbe number etc..The focal length of lens parameter of the present embodiment optical system is：First lens are burnt
Away from f1=18.9mm, the second focal length of lens f2=6.85mm, the 3rd focal length of lens f3=-4.8mm, the 4th focal length of lens f4=
10.9mm the 5th focal length of lens f5=13.2mm, Δ h=110mm, can gather clear binocular iris figure in the range of 250-360mm
Picture, the binocular iris image acquiring for relative broad range.
Table two：The concrete structure parameter of embodiment two of the imaging lens of the present invention
Fig. 5 is the optical performance curve figure of the present embodiment imaging lens, and 3A shows the distortion curve figure (%) of the present embodiment,
In the range of full filed, distortion aberration is in the range of 0.5%；3B shows the curvature of field curve map (mm) of the present embodiment, is regarding entirely
In the range of, the curvature of field aberration of meridian plane and each light of sagittal surface is respectively less than 0.05mm；3C shows that the MTF of the embodiment of the present invention is special
Linearity curve, finds out that the MTF of each visual field reaches diffraction limit in object distance 300mm, at spatial frequency 100lp/mm from curve
Mtf value is more than 0.4；3D shows MTF curve of the embodiment of the present invention in object distance 250mm, as seen from the figure now in space
Mtf value is 0.3 or so at frequency 100lp/mm；3E shows MTF curve of the embodiment of the present invention in object distance 360mm, from figure
Find out now at spatial frequency 100lp/mm mtf value 0.3 or so；This reality it can be seen from above optical indicatrix figure
The imaging lens distortion for applying example is small, and with higher image quality, and field depth is wide.
On the other hand, the present invention provides a kind of iris imaging module, as shown in Figure 2 and Figure 4, including any of the above-described imaging
Camera lens and the imaging sensor 8 ' (8 ") positioned at the imaging lens rear, the imaging sensor 8 ' (8 ") are that CCD or CMOS is passed
Sensor.The iris imaging module of the present invention has higher image quality near infrared band, distorts small；It is simple in construction, assembling
It is convenient, low cost；Be particularly suitable for use in binocular iris capturing, requires low to the fitness of user.
Another further aspect, the present invention provides a kind of iris identification device, wrap state iris imaging module and with the iris into
The hardware circuit connected as module.The iris identification device of the present invention has higher image quality, distortion near infrared band
It is small；It is simple in construction, easy to assembly, low cost；Be particularly suitable for use in binocular iris capturing, requires low to the fitness of user.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of imaging lens, it is characterised in that include successively from front to back along light incident direction：
First lens, first lens are the biconvex lens with positive light coke, and its preceding surface is convex surface, and rear surface is convex
Face；
Second lens, second lens are the meniscus with positive light coke, and its preceding surface is convex surface, and rear surface is recessed
Face；
3rd lens, the 3rd lens are the meniscus with negative power, and its preceding surface is convex surface, and rear surface is recessed
Face；
4th lens, the 4th lens are the meniscus with positive light coke, and its preceding surface is convex surface, and rear surface is recessed
Face；
5th lens, the 5th lens are the biconvex lens with positive light coke, and its preceding surface is convex surface, and rear surface is convex
Face；
4th lens and the 5th lens are glued together.
2. imaging lens according to claim 1, it is characterised in that 1.8f≤f1≤2.3f, 0.45f≤f2≤1.1f ,-
0.55f≤f3≤- 0.33f, 1.05f≤f4≤1.35f, 0.9f≤f5≤1.67f；Wherein, f is the total focal length of imaging lens,
F1 is first focal length of lens, and f2 is second focal length of lens, and f3 is the 3rd focal length of lens, and f4 is the 4th focal length of lens, and f5 is the 5th
The focal length of lens.
3. imaging lens according to claim 1, it is characterised in that 17mm≤f1≤21mm, 4mm≤f2≤9.5mm ,-
5mm≤f3≤- 3mm, 9.5mm≤f4≤12mm, 8mm≤f5≤15mm；200mm≤h≤400mm, Δ h >=110mm；Wherein, h
For object distance, Δ h is object space field depth, the farthest shooting distance of Δ h=object spaces-object space minimum photographic distance.
4. imaging lens according to claim 1, it is characterised in that first lens, the second lens, the 3rd lens,
The material of 4th lens and the 5th lens is met：1.6≤nd≤1.8,25≤vd≤55, wherein, nd is the refraction of lens material
Rate, vd is the abbe number of lens material.
5. the imaging lens according to claim 1-4 any claims, it is characterised in that the 3rd lens and the 4th
The diaphragm for controlling near infrared light percent of pass is provided between lens.
6. imaging lens according to claim 5, it is characterised in that the preceding surface of first lens is coated with that can reflect can
See light and through the filter coating of near infrared light；The rear surface of first lens and second lens, the 3rd lens, the 4th
The preceding surface and rear surface of lens and the 5th lens, which are coated with, can strengthen the near infrared band anti-reflection film of near infrared light transmitance.
7. imaging lens according to claim 5, it is characterised in that or, the imaging lens also include reflecting can
See light and through the optically flat filter of near infrared light；First lens, the second lens, the 3rd lens, the 4th lens and the 5th
The preceding surface and rear surface of lens, which are coated with, can strengthen the near infrared band anti-reflection film of near infrared light transmitance.
8. imaging lens according to claim 5, it is characterised in that first lens, the second lens, the 3rd lens,
The material of 4th lens and the 5th lens is glass.
9. a kind of iris imaging module, it is characterised in that including the imaging lens described in claim 1-8 any claims with
And the imaging sensor positioned at the imaging lens rear, described image sensor is CCD or cmos sensor.
10. a kind of iris identification device, it is characterised in that including the iris imaging module described in claim 9 and with it is described
The hardware circuit of iris imaging module connection.
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| CN201510494315.0A CN105137567B (en) | 2015-08-12 | 2015-08-12 | Imaging lens, iris imaging module and iris identification device |
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| CN201510494315.0A CN105137567B (en) | 2015-08-12 | 2015-08-12 | Imaging lens, iris imaging module and iris identification device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6824618B2 (en) * | 2016-03-31 | 2021-02-03 | 日本電産サンキョー株式会社 | Wide-angle lens |
| CN106405801B (en) * | 2016-09-14 | 2019-01-04 | 昆明物理研究所 | A kind of complex achromatic optical system and application for 1~2.5 μm of short infrared band |
| US11579410B2 (en) | 2017-04-18 | 2023-02-14 | Zhejiang Sunny Optical Co., Ltd. | Camera lens assembly |
| CN107273874B (en) * | 2017-07-14 | 2020-05-22 | Oppo广东移动通信有限公司 | Filter coating, iris recognition module and electronic device |
| CN109782380B (en) * | 2019-03-15 | 2021-05-25 | 苏州思源科安信息技术有限公司 | Iris imaging system and iris identification module |
| CN110646922A (en) * | 2019-09-30 | 2020-01-03 | 江西特莱斯光学有限公司 | Small-incidence-angle and large-emergence-angle lens and camera equipment |
| CN110749978B (en) * | 2019-11-14 | 2021-05-04 | 武汉虹识技术有限公司 | Imaging lens and iris recognition device |
| CN113467048A (en) * | 2021-06-29 | 2021-10-01 | 江西晶浩光学有限公司 | Optical lens, camera module and electronic equipment |
| CN114460746B (en) * | 2021-11-30 | 2024-02-13 | 歌尔光学科技有限公司 | Optical system and head-mounted display device |
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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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Denomination of invention: Imaging lens, iris imaging module and iris recognition device Effective date of registration: 20220614 Granted publication date: 20170912 Pledgee: China Construction Bank Corporation Xiongxian sub branch Pledgor: BEIJING EYECOOL TECHNOLOGY Co.,Ltd. Registration number: Y2022990000332 |