CN105445903A - 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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- CN105445903A CN105445903A CN201510219991.7A CN201510219991A CN105445903A CN 105445903 A CN105445903 A CN 105445903A CN 201510219991 A CN201510219991 A CN 201510219991A CN 105445903 A CN105445903 A CN 105445903A
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Abstract
The invention discloses an imaging lens, an iris imaging module and an iris identification device, and belongs to the field of biological identification. From front to back of a light incidence direction, the imaging lens sequentially comprises: a first lens, wherein the first lens is a convex-concave lens with positive power, the front surface is a convex surface, and the back surface is a concave surface; a second lens, wherein the second lens is a convex-concave lens with negative power, the front surface is a convex surface, and the back surface is a concave surface; and a third lens, wherein the third is a convex-concave lens with positive power, the front surface is a convex surface, and the back surface is a concave surface. The imaging lens provided by the invention is good in imaging quality, simple in structure and low in cost.
Description
Technical field
The present invention relates to field of biological recognition, refer to a kind of imaging lens, iris imaging module and iris identification device especially.
Background technology
Iris recognition belongs to field of biological recognition, it is a kind of biological identification technology based on iris, this technology carrys out authenticated identity by carrying out process to the iris texture information being less than 10mm region, iris recognition has the distinguishing feature such as uniqueness and stability compared with other biological recognition technology, becomes the most accurate recognition technology at present.And the realizing difficult point and be how to collect clear high-quality iris image of iris recognition technology, the optical system therefore gathering iris image becomes the key of iris identification device.
Existing iris capturing optical system can be divided into: varifocal optical system and focus optical system, wherein varifocal optical system volume is large, complex structure, cost are high, assembly difficulty is large, as: have employed four constituent element mechanical compensation zoom lens in patent CN200810071474.X, be made up of tens lens; Focus optical system structure simple, cost is low, device is convenient, as: the iris identification equipment in Jap.P. JP2004-167046, it gathers camera lens and is made up of two panels lens and filter plate, but this system imaging is second-rate, have larger spherical aberration and other aberration, the degree of freedom of optical design is less; U.S. patent Nos 20090161069A1, improve for the optical texture in above-mentioned patent, filter plate is changed into rotational symmetric aspheric mirror, namely three-chip type system, improves image quality preferably, but adopts aspheric mirror, improve manufacturing cost, therefore, good imaging quality, the optical system that focuses that structure is simple and cost is low becomes the emphasis studied at present.
Summary of the invention
The invention provides a kind of good imaging quality, the imaging lens that structure is simple and cost is low, iris imaging module and iris identification device.
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 light direction:
First lens, described first lens are the meniscus with positive light coke, and its front surface is convex surface, and rear surface is concave surface;
Second lens, described second lens are the meniscus with negative power, and its front surface is convex surface, and rear surface is concave surface;
3rd lens, described 3rd lens are the meniscus with positive light coke, and its front surface is convex surface, and rear surface is concave surface.
A kind of iris imaging module, comprise above-mentioned 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 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 three lens, is specially adapted to closely gather monocular iris image, and can make miniaturization portable harvester; It has higher image quality at near-infrared band, distorts little; Three lens are spherical lens, do not have non-spherical lens, and three lens are meniscus, and structure is simple, and easy to assembly, cost is low.
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 distortion curve figure of embodiment one; 3B is the curvature of field curve map of embodiment one; 3C is the relative exposure curve map of embodiment one; 3D is the encircled energy curve map of embodiment one; 3E 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 distortion curve figure of embodiment two; 5B is the curvature of field curve map of embodiment two; 5C is the relative exposure curve map of embodiment two; 5D is the encircled energy curve map of embodiment two; 5E 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 light direction:
First lens 1, first lens 1 are for having the meniscus of positive light coke, and its front surface 11 is convex surface, and rear surface 12 is concave surface;
Second lens 2, second lens 2 are for having the meniscus of negative power, and its front surface 21 is convex surface, and rear surface 22 is concave surface;
3rd lens the 3, three lens 3 are for having the meniscus of positive light coke, and its front surface 31 is convex surface, and rear surface 32 is concave surface; The front surface of each lens above-mentioned refers to that the face that infrared light is injected, rear surface refer to the face that infrared light penetrates, lower same.
Compared with prior art, imaging lens of the present invention is made up of three lens, is specially adapted to closely gather monocular iris image, and can make miniaturization portable harvester; It has higher image quality at near-infrared band, distorts little; Three lens are spherical lens, do not have non-spherical lens, and three lens are meniscus, and structure is simple, and easy to assembly, cost is low.
As a modification of the present invention, the focal length of each lens can meet :-1.5f≤f2≤-1.2f, 1.5f≤f3≤2.0f, 0.5≤f1/f3≤0.7, wherein, f is total focal length of described imaging lens, and f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, and f3 is the focal length of the 3rd lens 3.
When the focal length of each lens meets above-mentioned relation, at near-infrared band, there is higher image quality, almost undistorted.
Further, 12mm≤f1≤22.4mm ,-24mm≤f2≤-19.2mm, 24mm≤f3≤32mm.
Improve as another kind of the present invention, the material of the first lens 1, second lens 2 and the 3rd lens 3 meets: 1.50≤nd≤1.75,30≤vd≤65, wherein, nd is the refractive index of lens material, and vd is the abbe number of lens material.Adopt the material of above-mentioned refractive index and abbe number can either obtain good image quality, can material cost be saved again.
Preferably, the first lens 1 front end or the diaphragm 4 that is provided with between the first lens 1 and the second lens 2 for controlling near infrared light percent of pass as shown in Figure 2 and Figure 4.Diaphragm can regulate the power of the near infrared light beam passed through, and can select different diaphragms under different photoenvironments.
And can be coated with at the front surface 11 of the first lens 1 can reflect visible light through the filter coating (as near-infrared band narrow-band-filter film) of near infrared light; 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.
Or imaging lens also comprises can reflect visible light through the optically flat filter 5 of near infrared light, optically flat filter 5 can avoid visible ray to the interference of imaging lens, and optically flat filter can be arranged at front end or the rear end of whole imaging lens, as shown in Figure 2.
Meanwhile, the near-infrared band anti-reflection film that can strengthen near infrared light transmitance can also be all coated with at the front surface of the rear surface 12 of the first lens 1 and the second lens 2 and the 3rd lens 3 and rear surface.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 1, second lens 2 and the 3rd lens 3 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 closely monocular iris recognition, and as shown in Figure 2, be made up of three lens combination, optically flat filter 5, the rear of imaging lens is provided with imageing sensor 6, is followed successively by along light direction: optically flat filter 5; Have the first lens 1 of positive light coke, it is meniscus, and front surface 11 is convex surface, and rear surface 12 is concave surface; Have the second lens 2 of negative power, it is meniscus, and front surface 21 is convex surface, and rear surface 22 is concave surface; Have the 3rd lens 3 of positive light coke, it is meniscus, and front surface 31 is convex surface, and rear surface 32 is concave surface; Three lens and optically flat filter are glass material; Imaging surface is imageing sensor face, and it is CCD or cmos sensor.
The imaging lens imaging wavelength of the present embodiment is near-infrared band 700-900nm, optically flat filter 5 is coated with near-infrared band narrow-band-filter film, play the effect of filtering visible light-transmissive near infrared light, the front surface of each lens and rear surface are all coated with near-infrared band anti-reflection film, strengthen the transmitance of near-infrared band light.
When imaging lens collocation less than 1,000,000 of the present invention or VGA imageing sensor, form iris imaging module, during for gathering monocular iris image, iris image clearly can be photographed at closer distance place (13-18cm), this imaging lens concrete structure parameter refers to table one, comprises the surface type of lens face, radius-of-curvature, lens thickness, refractive index, abbe number etc.The focal length of lens parameter of the present embodiment optical system is: total focal distance f=16mm, the first focal length of lens f1=16.7mm, the second focal length of lens f2=-20.5mm, the 3rd focal length of lens f3=25mm.
Table one: the embodiment one concrete structure parameter of imaging lens of the present invention
Fig. 3 is the distortion curve figure (%) that the optical performance curve figure of embodiment of the present invention imaging lens, Fig. 3 A show the present embodiment, and within the scope of full filed, distortion aberration is all in 0.51% scope; Fig. 3 B shows the curvature of field curve map (mm) of 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 0.18mm; Fig. 3 C shows the relative exposure curve map of the present embodiment, and within the scope of full filed, relative exposure is all greater than 95%, and make the overall brightness taking image even, without dark angle, consistance is good; Fig. 3 D shows the encircled energy curve map of the present embodiment, and energy concentrates within the scope of 50 μm completely, has higher encircled energy; Fig. 3 E shows the MTF family curve of the present embodiment, finds out within the scope of full filed from curve, and at spatial frequency 65lp/mm place, mtf value is all greater than 0.5.As can be seen from above optical indicatrix figure, embodiment of the present invention imaging lens has higher image quality.
Embodiment two:
The present embodiment is a kind of imaging lens for monocular iris recognition, as shown in Figure 4, be made up of three lens combination and diaphragm 4, imaging lens rear is provided with imageing sensor 6, be followed successively by along light direction: first lens 1 with positive light coke, it is meniscus, and front surface 11 is convex surface, and rear surface 12 is concave surface; Have the second lens 2 of negative power, it is meniscus, and front surface 21 is convex surface, and rear surface 22 is concave surface; Have the 3rd lens 3 of positive light coke, it is meniscus, and front surface 31 is convex surface, and rear surface 32 is concave surface; Diaphragm 4 is between the first lens 1 and the second lens 2, and three lens are glass material; Imaging surface is imageing sensor face, and it is CCD or cmos sensor.
The imaging lens imaging wavelength of the present embodiment is near-infrared band 700-900nm, the front surface 11 of the first lens 1 plates near-infrared band narrow-band-filter film, play the effect of filtering visible light-transmissive near infrared light, all the other lens faces are coated with near-infrared band anti-reflection film, strengthen the transmitance of near-infrared band light.
When imaging lens collocation less than 1,000,000 of the present invention or VGA imageing sensor, form iris imaging module, during for gathering monocular iris image, can at the iris image of closer distance place (13-18cm) shooting clear, this imaging lens concrete structure parameter refers to table two, comprises the surface type of lens face, radius-of-curvature, lens thickness, refractive index, abbe number etc.The focal length of lens parameter of the present embodiment optical system is: total focal distance f=16mm, the first focal length of lens f1=16.21mm, the second focal length of lens f2=-23.35mm, the 3rd focal length of lens f3=27.24mm.
Table two: the embodiment two concrete structure parameter of imaging lens of the present invention
Fig. 5 is the distortion curve figure (%) that the optical performance curve figure of embodiment of the present invention imaging lens, Fig. 5 A show the present embodiment, and within the scope of full filed, distortion aberration is all in 0.4% scope; Fig. 5 B shows the curvature of field curve map (mm) of 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 0.15mm; Fig. 5 C shows the relative exposure curve map of the present embodiment, and within the scope of full filed, relative exposure is all greater than 95%, and make the overall brightness taking image even, without dark angle, consistance is good; Fig. 5 D shows the encircled energy curve map of the present embodiment, and energy concentrates within the scope of 50 μm completely, has higher encircled energy; Fig. 5 E shows the MTF family curve of the present embodiment, finds out within the scope of full filed from curve, and at spatial frequency 65lp/mm place, mtf value is all greater than 0.5.As can be seen from above optical indicatrix figure, embodiment of the present invention imaging lens 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 imaging lens and be positioned at the imageing sensor 6 at this imaging lens rear, this imageing sensor 6 is CCD or cmos sensor.Iris imaging module of the present invention has higher image quality at near-infrared band, distorts little; Structure is simple, and easy to assembly, cost is low, is particularly useful for closely monocular iris capturing, and can make miniaturization portable harvester.
Again on the one hand, the invention provides a kind of iris identification device, wrap the hardware circuit stated iris imaging module and be connected with this iris imaging module.Iris identification device of the present invention has higher image quality at near-infrared band, distorts little; Structure is simple, and easy to assembly, cost is low, is particularly useful for closely monocular iris capturing, and can make miniaturization portable harvester.
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 light direction:
First lens, described first lens are the meniscus with positive light coke, and its front surface is convex surface, and rear surface is concave surface;
Second lens, described second lens are the meniscus with negative power, and its front surface is convex surface, and rear surface is concave surface;
3rd lens, described 3rd lens are the meniscus with positive light coke, and its front surface is convex surface, and rear surface is concave surface.
2. imaging lens according to claim 1, is characterized in that ,-1.5f≤f2≤-1.2f, 1.5f≤f3≤2.0f, 0.5≤f1/f3≤0.7, wherein, f is total focal length of described imaging lens, f1 is the focal length of the first lens, and f2 is the focal length of the second lens, and f3 is the focal length of the 3rd lens.
3. imaging lens according to claim 1, is characterized in that, 12mm≤f1≤22.4mm ,-24mm≤f2≤-19.2mm, 24mm≤f3≤32mm.
4. imaging lens according to claim 1, is characterized in that, the material of described first lens, the second lens and the 3rd lens meets: 1.50≤nd≤1.75,30≤vd≤65, wherein, nd is the refractive index of lens material, and vd is the abbe number of lens material.
5. the imaging lens according to the arbitrary claim of claim 1-4, is characterized in that, described first lens front or the diaphragm be provided with between described first lens and the second lens 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;
Or described imaging lens also comprises can reflect visible light through the optically flat filter of near infrared light.
7. imaging lens according to claim 5, is characterized in that, the rear surface of described first lens and the front surface of described second lens and the 3rd lens and rear surface 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 and the 3rd lens is glass.
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. an 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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| CN201510219991.7A CN105445903B (en) | 2015-04-30 | 2015-04-30 | Imaging lens, iris imaging module and iris identification device |
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| CN201510219991.7A CN105445903B (en) | 2015-04-30 | 2015-04-30 | Imaging lens, iris imaging module and iris identification device |
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| CN108562999A (en) * | 2018-03-22 | 2018-09-21 | 浙江舜宇光学有限公司 | Optical imaging lens group |
| WO2018192144A1 (en) * | 2017-04-18 | 2018-10-25 | 浙江舜宇光学有限公司 | Camera lens |
| WO2018223582A1 (en) * | 2017-06-05 | 2018-12-13 | 浙江舜宇光学有限公司 | Iris camera lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10996434B2 (en) | 2017-06-05 | 2021-05-04 | Zhejiang Sunny Optical Co., Ltd | Iris lens assembly |
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| CN108562999B (en) * | 2018-03-22 | 2023-04-07 | 浙江舜宇光学有限公司 | Optical imaging lens assembly |
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| CN105445903B (en) | 2018-01-05 |
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Effective date of registration: 20230908 Address after: Building 4E, Building 1, Tingwei Industrial Park, No. 6 Liufang Road, Zone 67, Xingdong Community, Xin'an Street, Bao'an District, Shenzhen City, Guangdong Province, 518101 Patentee after: SHENZHEN AIKU SMART TECHNOLOGY CO.,LTD. Patentee after: Beijing Eyes Intelligent Technology Co.,Ltd. Patentee after: BEIJING EYECOOL TECHNOLOGY Co.,Ltd. Address before: 518000 Guangdong Province, Nanshan District, Shenzhen City, Guangdong Province, Guangdong Province, Yuehai Street Science Park Central District, 15 Keyuan Road, Kexing Science Park C Building 3 Unit 201 Patentee before: SHENZHEN EYECOOL INTELLIGENT TECHNOLOGY CO.,LTD. |