CN105242375A - Long-focal-length iris identification object lens - Google Patents
Long-focal-length iris identification object lens Download PDFInfo
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- CN105242375A CN105242375A CN201510615043.5A CN201510615043A CN105242375A CN 105242375 A CN105242375 A CN 105242375A CN 201510615043 A CN201510615043 A CN 201510615043A CN 105242375 A CN105242375 A CN 105242375A
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Abstract
The invention relates to a long-focal-length iris identification object lens. The long-focal-length iris identification object lens comprises a front group, a rear group and an imaging group which are successively coaxially arranged at intervals. The front group comprises a first convex lens, a first doublet lens and a first concave lens which are successively arranged at intervals from an object side to an image side, and the first doublet lens is composed of a first sub concave lens and a first sub convex lens; the rear group comprises a second convex lens, a second concave lens and a second doublet lens, and the second doublet lens is composed of a second sub convex lens and a second sub concave lens; and the imaging group comprises a CMOS chip. The long-focal-length iris identification object lens provided by the invention makes up for the disadvantages of insufficient work distance of a conventional iris identification object lens, prolongs the work distance of an iris identification optical system, is of good imaging quality which is far beyond the demand of a large-view-field CMOS, and is high in resolution, simple in structure, easy to process and not high in overall cost, thereby being suitable for large-area popularization and application.
Description
Technical field
The present invention relates to optical technical field, particularly relate to a kind of long-focus iris recognition object lens.
Background technology
The iris recognition object lens that general iris recognition product uses, its operating distance only has 15-30cm, can only realize in-plant iris recognition.And the singularity of iris, to common visible ray be absorb, and the infrared beam of about 850nm is had to the effect of reflection, so according to this singularity, the camera of iris recognition needs carry out special aberration correction near infrared spectrum thus just can collect the iris image of high-resolution.And the resolution of infrared objective general is on the market lower, infrared objective is comparatively used for thermal imaging, the Requirement of Spectrum that thermal imaging system is corresponding is high and the photosensitive Pixel size of corresponding Sensor is about about 20um, and this kind of infrared objective is unpractical concerning we apply.And common image-forming objective lens, its spectrum is 400-700nm, does not have special rectification at infrared band.
Summary of the invention
Technical matters to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of long-focus iris recognition object lens.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of long-focus iris recognition object lens, comprises coaxial spaced front group, rear group and imaging group successively in its light channel structure from the object side to the image side.Described front group comprises from the object side to the image side spaced first convex lens, the first cemented doublet and the first concavees lens successively, described first cemented doublet is made up of the first sub-concavees lens and the first sub-convex lens, described first sub-concavees lens are arranged near described first convex lens side between described first convex lens and the first concavees lens, and described first sub-convex lens are arranged between described first convex lens and the first concavees lens near described first concavees lens side; Described rear group comprises from the object side to the image side spaced second convex lens, the second concavees lens and the second cemented doublet successively, described second cemented doublet is made up of the second sub-convex lens and the second sub-concavees lens, and described second sub-convex lens are arranged near described second concavees lens, described second sub-concavees lens are arranged near described imaging group; Described imaging group comprises the CMOS chip for imaging.
On the basis of technique scheme, the present invention can also do following improvement:
Further: described first convex lens are biconvex lens, described first sub-concavees lens are plano-concave lens, described first sub-convex lens are plano-convex lens, described first concavees lens are plano-concave lens, and the convex surface of the concave surface of the first sub-concavees lens and described first sub-convex lens is tightly connected, the plane side of described first sub-concavees lens is arranged towards described first convex lens, and the plane side of described first sub-convex lens is arranged towards the concave surface of described first concavees lens.
Further: described second convex lens are biconvex lens, described second concavees lens are plano-concave lens, described second sub-convex lens are plano-convex lens, described second sub-concavees lens are plano-concave lens, and the plane of described second sub-convex lens is connected with the flat seal of described second sub-concavees lens, the concave surface side of described second concavees lens is arranged towards described second convex lens, the convex surface side of described second sub-convex lens is arranged towards the plane side of described second concavees lens, and the concave surface side of described second sub-concavees lens is arranged towards described CMOS chip 7.
Further: the focal length of described first convex lens is between 120mm and 170mm, the focal length of described first sub-concavees lens is between-60mm to-80mm, the focal length of described first sub-convex lens is between 70mm and 100mm, the focal length of described first concavees lens is between-190mm-and-210mm, the focal length of described second convex lens is between 70mm and 90mm, the focal length of described second concavees lens is between-140mm and-170mm, the focal length of described second sub-convex lens is between 60mm and 80mm, the focal length of described second sub-concavees lens is between-30mm-and-50mm.
Further: the refractive index of described first convex lens is between 1.4 and 1.6, the refractive index of described first sub-concavees lens is between 1.6 and 1.8, the refractive index of described first sub-convex lens is between 1.5 and 1.7, the refractive index of described first concavees lens is between 1.5 and 1.7, the refractive index of described second convex lens is between 1.5 and 1.7, the refractive index of described second concavees lens is between 1.5 and 1.7, the refractive index of described second sub-convex lens is between 1.5 and 1.7, and the refractive index of described second sub-concavees lens is between 1.5 and 1.7.
Further: the distance d1 between described first convex lens and described first cemented doublet is between 2mm-5mm, distance d2 between described first cemented doublet and described first concavees lens is between 5mm-15mm, distance d3 between described first concavees lens and described second convex lens is between 50mm-70mm, distance d4 between described second convex lens and the second concavees lens is between 2mm-10mm, distance d5 between described second concavees lens and described second cemented doublet is between 1mm-5mm, distance d6 between described second cemented doublet and described CMOS chip is between 70mm-100mm.
Further: the mtf value of described object lens full filed when spatial frequency is 150lp/mm is greater than 0.3.
Further: described CMOS chip is of a size of 1.21 inches, its pixel dimension is 6 microns, and resolution is 4096 × 3072.
Further: the field angle of described object lens is 8 degree, and focal length is 189mm, and the curvature of field is less than 0.7mm, distortion is less than 1%, and maximum functional distance is 3 meters.
The invention has the beneficial effects as follows: a kind of long-focus iris recognition object lens of the present invention, compensate for the drawback of the operating distance deficiency of existing iris recognition object lens, effectively improve the operating distance of iris recognition optical system, image quality is excellent, and its picture element is considerably beyond the demand of Large visual angle CMOS, resolution is high, overcome the drawback that infrared camera differentiates rate variance, structure is simple, is easy to processing, holistic cost is not high, and suit large area to popularize use.
Accompanying drawing explanation
Fig. 1 is a kind of long-focus iris recognition objective lens arrangement schematic diagram of the present invention;
Fig. 2 is the MTF figure of a kind of long-focus iris recognition object lens of the present invention;
Fig. 3 is the point range figure of a kind of long-focus iris recognition object lens of the present invention;
Fig. 4 is the curvature of field distortion figure of a kind of long-focus iris recognition object lens of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows:
1, the first convex lens, the 2, first cemented doublet, the 3, first concavees lens, the 4, second convex lens, the 5, second concavees lens, the 6, second cemented doublet;
21, the first sub-concavees lens, the 22, first sub-convex lens, the 61, second sub-convex lens, the 62, second sub-concavees lens.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, a kind of long-focus iris recognition objective lens arrangement schematic diagram, comprises coaxial spaced front group, rear group and imaging group successively from the object side to the image side in its light channel structure.
Wherein, described front group comprises from the object side to the image side spaced first convex lens 1, first cemented doublet 2 and the first concavees lens 3 successively, described first cemented doublet 2 is made up of the first sub-concavees lens 21 and the first sub-convex lens 22, described first sub-concavees lens 21 are arranged near described first convex lens 1 side between described first convex lens 1 and the first concavees lens 3, and described first sub-convex lens 22 are arranged between described first convex lens 1 and the first concavees lens 3 near described first concavees lens 3 side; Described rear group comprises from the object side to the image side spaced second convex lens 4, second concavees lens 5 and the second cemented doublet 6 successively, described second cemented doublet 6 is made up of the second sub-convex lens 61 and the second sub-concavees lens 62, and described second sub-convex lens 61 are arranged near described second concavees lens 5, described second sub-concavees lens 62 are arranged near described imaging group; Described imaging group comprises the CMOS chip 7 for imaging.
In the present embodiment, described first convex lens 1 are biconvex lens, described first sub-concavees lens 21 are plano-concave lens, described first sub-convex lens 22 are plano-convex lens, described first concavees lens 3 are plano-concave lens, and the convex surface of the concave surface of the first sub-concavees lens 21 and described first sub-convex lens 22 is tightly connected, the plane side of described first sub-concavees lens 21 is arranged towards described first convex lens 1, and the plane side of described first sub-convex lens 22 is arranged towards the concave surface of described first concavees lens 3.
In the present embodiment, described second convex lens 4 are biconvex lens, described second concavees lens 5 are plano-concave lens, described second sub-convex lens 61 are plano-convex lens, described second sub-concavees lens 62 are plano-concave lens, and the plane of described second sub-convex lens 61 is connected with the flat seal of described second sub-concavees lens 62, the concave surface side of described second concavees lens 5 is arranged towards described second convex lens 4, the convex surface side of described second sub-convex lens 61 is arranged towards the plane side of described second concavees lens 5, the concave surface side of described second sub-concavees lens 62 is arranged towards described CMOS chip 7.
Preferably, the focal length of described first convex lens 1 is between 120mm and 170mm, the focal length of described first sub-concavees lens 21 is between-60mm to-80mm, the focal length of described first sub-convex lens 22 is between 70mm and 100mm, the focal length of described first concavees lens 3 is between-190mm-and-210mm, the focal length of described second convex lens 4 is between 70mm and 90mm, the focal length of described second concavees lens 5 is between-140mm and-170mm, the focal length of described second sub-convex lens 61 is between 60mm and 80mm, the focal length of described second sub-concavees lens 62 is between-30mm-and-50mm.
Preferably, the refractive index of described first convex lens 1 is between 1.4 and 1.6, the refractive index of described first sub-concavees lens 21 is between 1.6 and 1.8, the refractive index of described first sub-convex lens 22 is between 1.5 and 1.7, the refractive index of described first concavees lens 3 is between 1.5 and 1.7, the refractive index of described second convex lens 4 is between 1.5 and 1.7, the refractive index of described second concavees lens 5 is between 1.5 and 1.7, the refractive index of described second sub-convex lens 61 is between 1.5 and 1.7, and the refractive index of described second sub-concavees lens 62 is between 1.5 and 1.7.
Preferably, distance d1 between described first convex lens 1 and described first cemented doublet 2 is between 2mm-5mm, distance d2 between described first cemented doublet 2 and described first concavees lens 3 is between 5mm-15mm, distance d3 between described first concavees lens 3 and described second convex lens 4 is between 50mm-70mm, distance d4 between described second convex lens 4 and the second concavees lens 5 is between 2mm-10mm, distance d5 between described second concavees lens 5 and described second cemented doublet 6 is between 1mm-5mm, distance d6 between described second cemented doublet 6 and described CMOS chip 7 is between 70mm-100mm.
As shown in Figure 2, the MTF figure of a kind of long-focus iris recognition object lens of the present invention, from figure, we can see that the image quality of all visual fields of whole camera lens is consistent, MTF curve is compact a branch ofly reach diffraction limit, when spatial frequency is very low, MTF is tending towards 1, and mtf value at this moment can reflect the contrast of camera lens, mtf value, more close to 1, illustrates that the performance of camera lens is more excellent; When spatial frequency improves, when namely the density of sinusoidal grating improves, mtf value declines gradually, and MTF curve at this moment can reflect the resolution of camera lens.As can be seen from figure we, under 15lp/mm, mtf value can reach 0.93, under 60p/mm, mtf value can reach 0.70, under 105p/mm, mtf value can reach 0.50, illustrate that whole camera lens is good in low-frequency range contrast, and along with the raising of spatial frequency, its attenuation process is very slow, and its resolution excellent performance is described.In addition, under 150lp/mm, mtf value is still greater than 0.3, shows that its resolution performance formerly so can keep high levels spatial frequency is higher further.
In the present embodiment, described CMOS chip 7 is of a size of 1.21 inches, and pixel dimension is 6 microns, and resolution is 4096 × 3072.Adopt the CMOS chip of less pixel dimension and high-resolution, the image quality of whole camera lens can be made higher.
As shown in Figure 3, from figure, the point range figure of a kind of long-focus iris recognition object lens of the present invention, can see that the disc of confusion of whole camera lens each visual field is all less, all be less than the Pixel size of CMOS chip.Illustrate that the image quality of this image-forming objective lens is excellent.Because the picture of each object point is exactly a disc of confusion, two discs of confusion are near rear just bad differentiation, and so just limit the resolution of system, this spot is larger, and resolution is lower.In the present invention, described disc of confusion is all less, and is less than the Pixel size of CMOS chip, can guarantee that the resolution of whole image is higher.
As shown in Figure 4, the curvature of field distortion figure of a kind of long-focus iris recognition object lens of the present invention, as can be seen from the figure the curvature of field is less than 0.7mm, distortion is less than 1%, the picture point showing image is very little with the site error of picture point in theory, the distortion of image and distortion are also very small, show that the image quality of image is very high further.
Described in a kind of long-focus iris recognition object lens of the present invention, the field angle of object lens is 8 degree, focal length is 189mm, maximum functional distance is 3 meters, the spectral band that we select is 0.7 μm-0.9 μm, light beam in this wave band interval through iris region by iris patterns clearly imaging on CMOS chip, changed by CMOS chip, complete image clearly can be obtained.
A kind of long-focus iris recognition object lens of the present invention, compensate for the drawback of the operating distance deficiency of existing iris recognition object lens, effectively improve the operating distance of iris recognition optical system, image quality is excellent, and its picture element is considerably beyond the demand of Large visual angle CMOS, resolution is high, overcome the drawback that infrared camera differentiates rate variance, structure is simple, is easy to processing, holistic cost is not high, and suit large area to popularize use.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. long-focus iris recognition object lens, is characterized in that: comprise coaxial spaced front group, rear group and imaging group successively in its light channel structure from the object side to the image side;
Described front group comprises from the object side to the image side spaced first convex lens (1) successively, first cemented doublet (2) and the first concavees lens (3), described first cemented doublet (2) is made up of the first sub-concavees lens (21) and the first sub-convex lens (22), described first sub-concavees lens (21) are arranged between described first convex lens (1) and the first concavees lens (3) near described first convex lens (1) side, described first sub-convex lens (22) are arranged between described first convex lens (1) and the first concavees lens (3) near described first concavees lens (3) side,
Described rear group comprises from the object side to the image side spaced second convex lens (4), the second concavees lens (5) and the second cemented doublet (6) successively, described second cemented doublet (6) is made up of the second sub-convex lens (61) and the second sub-concavees lens (62), and described second sub-convex lens (61) are arranged near described second concavees lens (5), described second sub-concavees lens (62) are arranged near described imaging group;
Described imaging group comprises the CMOS chip (7) for imaging.
2. a kind of long-focus iris recognition object lens according to claim 1, it is characterized in that: described first convex lens (1) are biconvex lens, described first sub-concavees lens (21) are plano-concave lens, described first sub-convex lens (22) are plano-convex lens, described first concavees lens (3) are plano-concave lens, and the convex surface of the concave surface of the first sub-concavees lens (21) and described first sub-convex lens (22) is tightly connected, the plane side of described first sub-concavees lens (21) is arranged towards described first convex lens (1), the plane side of described first sub-convex lens (22) is arranged towards the concave surface of described first concavees lens (3).
3. a kind of long-focus iris recognition object lens according to claim 1, it is characterized in that: described second convex lens (4) are biconvex lens, described second concavees lens (5) are plano-concave lens, described second sub-convex lens (61) are plano-convex lens, described second sub-concavees lens (62) are plano-concave lens, and the plane of described second sub-convex lens (61) is connected with the flat seal of described second sub-concavees lens (62), the concave surface side of described second concavees lens (5) is arranged towards described second convex lens (4), the convex surface side of described second sub-convex lens (61) is arranged towards the plane side of described second concavees lens (5), the concave surface side of described second sub-concavees lens (62) is arranged towards described CMOS chip (7).
4. a kind of long-focus iris recognition object lens according to claim 1, it is characterized in that: the focal length of described first convex lens (1) is between 120mm and 170mm, the focal length of described first sub-concavees lens (21) is between-60mm to-80mm, the focal length of described first sub-convex lens (22) is between 70mm and 100mm, the focal length of described first concavees lens (3) is between-190mm-and-210mm, the focal length of described second convex lens (4) is between 70mm and 90mm, the focal length of described second concavees lens (5) is between-140mm and-170mm, the focal length of described second sub-convex lens (61) is between 60mm and 80mm, the focal length of described second sub-concavees lens (62) is between-30mm-and-50mm.
5. a kind of long-focus iris recognition object lens according to claim 1, it is characterized in that: the refractive index of described first convex lens (1) is between 1.4 and 1.6, the refractive index of described first sub-concavees lens (21) is between 1.6 and 1.8, the refractive index of described first sub-convex lens (22) is between 1.5 and 1.7, the refractive index of described first concavees lens (3) is between 1.5 and 1.7, the refractive index of described second convex lens (4) is between 1.5 and 1.7, the refractive index of described second concavees lens (5) is between 1.5 and 1.7, the refractive index of described second sub-convex lens (61) is between 1.5 and 1.7, the refractive index of described second sub-concavees lens (62) is between 1.5 and 1.7.
6. a kind of long-focus iris recognition object lens according to claim 1, it is characterized in that: the distance d1 between described first convex lens (1) and described first cemented doublet (2) is between 2mm-5mm, distance d2 between described first cemented doublet (2) and described first concavees lens (3) is between 5mm-15mm, distance d3 between described first concavees lens (3) and described second convex lens (4) is between 50mm-70mm, distance d4 between described second convex lens (4) and the second concavees lens (5) is between 2mm-10mm, distance d5 between described second concavees lens (5) and described second cemented doublet (6) is between 1mm-5mm, distance d6 between described second cemented doublet (6) and described CMOS chip (7) is between 70mm-100mm.
7. a kind of long-focus iris recognition object lens according to claim 1, is characterized in that: the mtf value of described object lens full filed when spatial frequency is 150lp/mm is greater than 0.3.
8. a kind of long-focus iris recognition object lens according to claim 1, is characterized in that: described CMOS chip (7) is of a size of 1.21 inches, and pixel dimension is 6 microns, and resolution is 4096 × 3072.
9. a kind of long-focus iris recognition object lens according to any one of claim 1 to 8, is characterized in that: the field angle of described object lens is 8 degree, and focal length is 189mm, and the curvature of field is less than 0.7mm, and distortion is less than 1%, and maximum functional distance is 3 meters.
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| CN107368772A (en) * | 2016-05-13 | 2017-11-21 | 林武旭 | Retina recognizes module |
| CN109840460A (en) * | 2017-11-28 | 2019-06-04 | 武汉真元生物数据有限公司 | A kind of iris capturing system |
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| CN204964859U (en) * | 2015-09-23 | 2016-01-13 | 武汉虹识技术有限公司 | Long -focus iris discernment objective |
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| CN101681021A (en) * | 2007-04-06 | 2010-03-24 | 全球仿生光学有限公司 | Large depth-of-field imaging system and iris recognition system |
| KR20100125102A (en) * | 2009-05-20 | 2010-11-30 | 삼성전자주식회사 | Wide angle lens and imaging optical device having the same |
| US20120026609A1 (en) * | 2010-07-27 | 2012-02-02 | Yuki Kubota | Imaging optical system, and imaging apparatus incorporting the same |
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