CN203909382U - Narrow-bandpass identification lens with super field depth and capable of acquiring iris images of two eyes simultaneously - Google Patents
Narrow-bandpass identification lens with super field depth and capable of acquiring iris images of two eyes simultaneously Download PDFInfo
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- CN203909382U CN203909382U CN201420297896.XU CN201420297896U CN203909382U CN 203909382 U CN203909382 U CN 203909382U CN 201420297896 U CN201420297896 U CN 201420297896U CN 203909382 U CN203909382 U CN 203909382U
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- lens
- iris images
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- narrow bandpass
- bandpass
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- 238000002834 transmittance Methods 0.000 claims abstract description 11
- 239000000571 coke Substances 0.000 claims description 13
- 230000003595 spectral effect Effects 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 10
- 239000005304 optical glass Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000000701 chemical imaging Methods 0.000 abstract 1
- 210000000554 iris Anatomy 0.000 description 26
- 238000005516 engineering process Methods 0.000 description 9
- 230000004075 alteration Effects 0.000 description 7
- 230000000007 visual effect Effects 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000001915 proofreading effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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Abstract
The utility model discloses a narrow-bandpass identification lens with super field depth and capable of acquiring iris images of two eyes simultaneously. A first lens with positive focal power, a second lens with negative focal power, a crescent third lens with positive focal power, and a crescent fourth lens with positive focal power are sequentially arranged along a light transmission direction from left to right on a lens shell. A first diaphragm is arranged between the first and second lenses and a second diaphragm is arranged between the third and fourth lenses. The identification lens is characterized by super field depth, narrow-bandpass transmittance, and capability of scanning and identifying the iris images of the two eyes simultaneously. Even when the human eyes perform self-regulation, the lens is not influenced and can acquire the clear and accurate iris images. By employing the narrow-bandpass spectral imaging, the signal to noise ratio of the images can be increased to an extreme extent and the iris images can be represented truthfully.
Description
[technical field]
The utility model relates to camera lens, especially a kind of super depth of field and can simultaneously obtain the narrow bandpass identification camera lens of two iris images.
[background technology]
Iris recognition technology is the biological identification technology of rising in recent years, and iris recognition technology is by the biological characteristic of human body, to identify people's identity.Due to its reliability with height, iris recognition technology has been widely used in the fields such as prison, airport, limit mirror, bank.Can iris recognition camera lens be obtain the parts of clear, accurate iris image most critical in iris recognition technology.Along with the development of infotech, difficulty and the importance of identification are more and more outstanding.Due to iris recognition, have the advantages such as uniqueness, stability, anti-duplicity, collection property, iris recognition has become one of recognition technology the most rising in current authentication.Clear, iris image is one of difficult point of iris recognition technology accurately, iris image is clear, accurately whether determined to a great extent false rejection rate FRR.
The utility model proposes for the deficiencies in the prior art research.
[utility model content]
The technical problems to be solved in the utility model is to provide a kind of super depth of field and can obtains the narrow bandpass identification camera lens of two iris images simultaneously, on lens housing, along light transmition direction be from left to right disposed with have positive light coke first lens, have the second lens of negative power, all there is positive light coke be crescent shape the 3rd lens and the 4th lens, and be provided with the first diaphragm between first lens and the second lens, between the 3rd lens and the 4th lens, be provided with the second diaphragm.The utlity model has the super depth of field, narrow bandpass transmitance and the feature of two iris images of scanning recognition simultaneously, when human eye self-control, do not affect the utility model camera lens and gather clear, iris image accurately yet, utilize narrow bandpass light spectrum image-forming can farthest improve the signal to noise ratio (S/N ratio) of image, truly reduce iris image.
For solving the problems of the technologies described above, a kind of super depth of field of the utility model and can simultaneously obtain the narrow bandpass identification camera lens of two iris images, comprises lens housing, and described lens housing is from left to right disposed with and is made by optical glass along light transmition direction:
First lens, described first lens is the plano-convex lens with positive light coke, and left side is first lens convex surface, and right side is first lens plane;
The second lens, described the second lens are the concavees lens with negative power, arranged on left and right sides is respectively the left concave surface of the second lens and the right concave surface of the second lens;
The 3rd lens, described the 3rd lens are the lens that are crescent shape with positive light coke, and left side is the 3rd concave lens surface, and right side is the 3rd lens convex surface;
The 4th lens, described the 4th lens are the lens that are crescent shape with positive light coke, and left side is the 4th lens convex surface, and right side is the 4th concave lens surface;
Between described first lens and the second lens, be provided with the first diaphragm.
The first lens convex surface of described first lens is provided with the near infrared plated film of narrow bandpass, and its frequency span is 10nm, and the radius-of-curvature of the left concave surface of described the second lens and the right concave surface of the second lens is equal, and described the 3rd lens and the 4th lens thickness equate.
Refractive index and the Abbe number of described the second lens are respectively N
dand V
d, meet: 1.7>=N
d>=1.58,40>=V
d>=28.
Total focal length of described camera lens is f
0, the object space depth of field is Obj
dep, object space coverage is h1, and shooting object distance is h2, and the optical focal length of described first lens L1 is f
l1, the optical focal length of described the second lens L2 is f
l2, the optical focal length of described the 3rd lens L3 is f
l3, meet: 15mm>=f
l1>=8mm, 0.5f0>=f
l1>=1.2f
0,-6mm≤f
l2≤-3mm ,-0.375f
0≤ f
l2≤ 0.1f
0, 8mm≤f
l3≤ 20mm, 0.5f
0≤ f
l3≤ 1.25f
0, 80mm≤h1≤250,250mm≤h2≤500, Obj
dep>80mm.
Described camera lens when wavelength is 800nm～900nm, spectral transmittance T >=80%, when wavelength is 400nm～720nm, spectral transmittance T≤5%.
Between described the 3rd lens and the 4th lens, be provided with the second diaphragm.
A kind of super depth of field of the utility model and can simultaneously obtain the narrow bandpass identification camera lens of two iris images, on lens housing, along light transmition direction be from left to right disposed with have positive light coke first lens, have the second lens of negative power, all there is positive light coke be crescent shape the 3rd lens and the 4th lens, and be provided with the first diaphragm between first lens and the second lens, between the 3rd lens and the 4th lens, be provided with the second diaphragm.The utlity model has the super depth of field, narrow bandpass transmitance and the feature of two iris images of scanning recognition simultaneously, when human eye self-control, do not affect the utility model camera lens and gather clear, iris image accurately yet, utilize narrow bandpass light spectrum image-forming can farthest improve the signal to noise ratio (S/N ratio) of image, truly reduce iris image.
[accompanying drawing explanation]
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail, wherein:
Fig. 1 is structural representation of the present utility model, and light incident from left to right.
Fig. 2 be the utility model when object distance is 350mm, the MTF Zhuo of each visual field reaches the curve map of diffraction limit.
Fig. 3 be the utility model when object distance is 350mm, the basically identical and uniform out of focus curve of each visual field picture element of each visual field peak value.
Fig. 4 is the curve map of the utility model curvature of field.
Fig. 5 is that the utility model exists | light does not distort | and distortion curve figure during <0.5%.
Fig. 6 is for being the MTF curve map of the utility model when object distance is 310mm.
Fig. 7 is for being the MTF curve map of the utility model when object distance is 400mm.
Fig. 8 is for being spectral transmittance of the present utility model.
Fig. 9 is use principle schematic diagram of the present utility model.
[embodiment]
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.
A kind of super depth of field of the utility model and can simultaneously obtain the narrow bandpass identification camera lens of two iris images, comprise lens housing L0, and described lens housing L0 is from left to right disposed with and is made by optical glass along light transmition direction:
First lens L1, described first lens L1 is the plano-convex lens with positive light coke, and left side is first lens convex surface S1, and right side is first lens planar S 2;
The second lens L2, described the second lens L2 is the concavees lens with negative power, arranged on left and right sides is respectively the left concave surface S3 of the second lens and the right concave surface S4 of the second lens;
The 3rd lens L3, described the 3rd lens L3 is the lens that are crescent shape with positive light coke, and left side is the 3rd concave lens surface S5, and right side is the 3rd lens convex surface S6;
The 4th lens L4, described the 4th lens L4 is the lens that are crescent shape with positive light coke, and left side is the 4th lens convex surface S7, and right side is the 4th concave lens surface S8;
Between described first lens L1 and the second lens L2, be provided with the first diaphragm GQ1, between described the 3rd lens L3 and the 4th lens L4, be provided with the second diaphragm GQ2.
In order to reduce the non-main imaging spectral of the utility model camera lens, enter, to reduce the generation of parasitic light, improve signal noise ratio (snr) of image, obtain clear iris image accurately, can on the surface of the optics effective aperture of any eyeglass of the utility model camera lens, plate the spectral transmittance that near infrared narrow bandpass multilayer film is controlled it.
The first lens convex surface S1 of described first lens L1 is provided with the near infrared plated film of narrow bandpass, and its frequency span is 10nm; As shown in Figure 8, when incident light wavelength is 810nm, the transmitance of plated film is the tallest and the biggest in 95%, incident light wavelength is 850nm and while being less than 780nm, plated film transmitance is all less than 2%, the radius-of-curvature of the left concave surface S3 of described the second lens and the right concave surface S4 of the second lens is equal, and described the 3rd lens L3 and the 4th lens L4 thickness equate.
Refractive index and the Abbe number of described the second lens L2 are respectively N
dand V
d, meet: 1.7>=N
d>=1.58,40>=V
d>=28.
Total focal length of described super field-depth iris identification camera lens is f
0, the optical focal length of described first lens L1 is f
l1, the optical focal length of described the second lens L2 is f
l2, the optical focal length of described the 3rd lens L3 is f
l3, meet: 15mm>=f
l1>=8mm, 0.5f0>=f
l1>=1.2f
0,-6mm≤f
l2≤-3mm ,-0.375f
0≤ f
l2≤ 0.1f
0, 8mm≤
fL3≤ 20mm, 0.5f
0≤ f
l3≤ 1.25f
0.
The utility model lens construction symmetric design, its off-axis aberration is good.When optical distortion absolute value is controlled in 0.5%, the FNO design load of camera lens, when 5.7 left and right, can obtain good luminous flux and the larger depth of field.
First lens L1 is designed to plano-convex lens, can effectively reduce spherical aberration on axle, and the second lens L2 is for proofreading and correct spherical aberration, astigmatism and the curvature of field of whole system.Focal power after the second lens L2 is by the 3rd lens L3 and two positive lens shareds of the 4th lens L4, thereby greatly reduced the spherical aberration residual volume of camera lens, makes camera lens aberration reach perfect calibration.
The object space coverage of the utility model camera lens is h1, and shooting object distance is h2, and the object space depth of field is Obj
dep, meet:
80mm≤h1≤250,250mm≤h2≤500,Obj
dep>80mm。
The utility model camera lens is taken object distance and field angle by control, makes the coverage of camera lens itself meet two distance ranges of human eye, to meet two requirements of taking simultaneously.
The utility model camera lens, when incident light sees through the utility model camera lens, when its wavelength is 800nm～900nm, spectral transmittance T >=80%; When incident light wavelength is 400nm～720nm, spectral transmittance T≤5%; Wavelength is 720nm～1150nm near-infrared band, and its spectral transmittance is greater than 80%, and wavelength is 380～680nm visible light wave range, and corresponding spectral transmittance is less than 5%.
The first lens L1 of the utility model camera lens, the second lens L2, the 3rd lens L3 and the 4th lens L4 are made by optical glass, and the first diaphragm GQ1 is close in the first lens planar S 2 of first lens L1.The left concave surface S3 of the second lens of the second lens L2 and the radius-of-curvature of the right concave surface S4 of the second lens equate, can reduce eyeglass prototype and the use of controlling instrument.Second piece of spherical aberration, astigmatism and curvature of field that eyeglass L2 produces for proofreading and correct first lens L1, the 3rd lens L3 and the 4th lens L4, the radius-of-curvature of the 3rd lens L3 and the 4th lens L4 is identical with thickness, to reduce eyeglass prototype and the use of controlling instrument, the focal power of organizing after the 3rd lens L3 and the 4th lens L4 two positive lens shareds, to reduce spherical aberration and coma.
When the design load of the FNO of system is 5.72, shooting object distance is 300～400mm, and roughly focusing just can obtain blur-free imaging, realizes the super depth of field of object space, raising recognition efficiency; When object distance is 350mm, the field angle of camera lens is 68mm, and this scope can contain the scope of two width of common human eye, scans, as shown in Figure 9 thereby can realize two irises simultaneously.
Following table is the structural parameters of the utility model embodiment.
Claims (6)
1. the super depth of field and can simultaneously obtain the narrow bandpass identification camera lenses of two iris images, is characterized in that comprising lens housing (L0), and described lens housing (L0) is from left to right disposed with and is made by optical glass along light transmition direction:
First lens (L1), described first lens (L1) is for having the plano-convex lens of positive light coke, and left side is first lens convex surface (S1), and right side is first lens plane (S2);
The second lens (L2), described the second lens (L2) are for having the concavees lens of negative power, and arranged on left and right sides is respectively the left concave surfaces of the second lens (S3) and the right concave surface of the second lens (S4);
The 3rd lens (L3), described the 3rd lens (L3) are for having the lens that are crescent shape of positive light coke, and left side is the 3rd concave lens surface (S5), and right side is the 3rd lens convex surface (S6);
The 4th lens (L4), described the 4th lens (L4) are for having the lens that are crescent shape of positive light coke, and left side is the 4th lens convex surface (S7), and right side is the 4th concave lens surface (S8);
Between described first lens (L1) and the second lens (L2), be provided with the first diaphragm (GQ1).
2. a kind of super depth of field and can simultaneously obtain the narrow bandpass identification camera lens of two iris images as claimed in claim 1, the first lens convex surface (S1) that it is characterized in that described first lens (L1) is provided with the near infrared plated film of narrow bandpass, its frequency span is 10nm, the radius-of-curvature of the left concave surfaces of described the second lens (S3) and the right concave surface of the second lens (S4) is equal, and described the 3rd lens (L3) and the 4th lens (L4) thickness equate.
3. a kind of super depth of field and can simultaneously obtain the narrow bandpass identification camera lens of two iris images as claimed in claim 2, is characterized in that refractive index and the Abbe number of described the second lens (L2) is respectively N
dand V
d, meet: 1.7>=N
d>=1.58,40>=V
d>=28.
4. a kind of super depth of field and can simultaneously obtain the narrow bandpass identification camera lens of two iris images as claimed in claim 3, the total focal length that it is characterized in that described camera lens is f
0, the object space depth of field is Obj
dep, object space coverage is h1, and shooting object distance is h2, and the optical focal length of described first lens (L1) is f
l1, the optical focal length of described the second lens (L2) is f
l2, the optical focal length of described the 3rd lens (L3) is f
l3, meet: 15mm>=f
l1>=8mm, 0.5f0>=f
l1>=1.2f
0,-6mm≤f
l2≤-3mm ,-0.375f
0≤ f
l2≤ 0.1f
0, 8mm≤f
l3≤ 20mm, 0.5f
0≤ f
l3≤ 1.25f
0, 80mm≤h1≤250,250mm≤h2≤500, Obj
dep>80mm.
5. a kind of super depth of field and can simultaneously obtain the narrow bandpass identification camera lens of two iris images as claimed in claim 4, it is characterized in that described camera lens is when wavelength is 800nm～900nm, spectral transmittance T >=80%, when wavelength is 400nm～720nm, spectral transmittance T≤5%.
6. a kind of super depth of field and can simultaneously obtain the narrow bandpass identification camera lens of two iris images as claimed in claim 1, is characterized in that being provided with the second diaphragm (GQ2) between described the 3rd lens (L3) and the 4th lens (L4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420297896.XU CN203909382U (en) | 2014-06-05 | 2014-06-05 | Narrow-bandpass identification lens with super field depth and capable of acquiring iris images of two eyes simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420297896.XU CN203909382U (en) | 2014-06-05 | 2014-06-05 | Narrow-bandpass identification lens with super field depth and capable of acquiring iris images of two eyes simultaneously |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203909382U true CN203909382U (en) | 2014-10-29 |
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ID=51783643
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420297896.XU Expired - Fee Related CN203909382U (en) | 2014-06-05 | 2014-06-05 | Narrow-bandpass identification lens with super field depth and capable of acquiring iris images of two eyes simultaneously |
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| Country | Link |
|---|---|
| CN (1) | CN203909382U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007534A (en) * | 2014-06-05 | 2014-08-27 | 舜宇光学(中山)有限公司 | Super-depth-of-field narrow-band-pass identification lens capable of obtaining iris images of two eyes simultaneously |
| WO2019052179A1 (en) * | 2017-09-18 | 2019-03-21 | 浙江舜宇光学有限公司 | Imaging lens group |
-
2014
- 2014-06-05 CN CN201420297896.XU patent/CN203909382U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007534A (en) * | 2014-06-05 | 2014-08-27 | 舜宇光学(中山)有限公司 | Super-depth-of-field narrow-band-pass identification lens capable of obtaining iris images of two eyes simultaneously |
| WO2019052179A1 (en) * | 2017-09-18 | 2019-03-21 | 浙江舜宇光学有限公司 | Imaging lens group |
| US11693214B2 (en) | 2017-09-18 | 2023-07-04 | Zhejiang Sunny Optical Co., Ltd | Imaging lens assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 |