CN105372795B - A kind of zoom iris recognition object lens - Google Patents
A kind of zoom iris recognition object lens Download PDFInfo
- Publication number
- CN105372795B CN105372795B CN201510888819.0A CN201510888819A CN105372795B CN 105372795 B CN105372795 B CN 105372795B CN 201510888819 A CN201510888819 A CN 201510888819A CN 105372795 B CN105372795 B CN 105372795B
- Authority
- CN
- China
- Prior art keywords
- lens
- focal length
- liquid material
- concavees
- convex lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/12—Fluid-filled or evacuated lenses
- G02B3/14—Fluid-filled or evacuated lenses of variable focal length
Abstract
The present invention relates to a kind of zoom iris recognition object lens, including sequentially coaxially the first convex lens, the first concavees lens, the second concavees lens, the second convex lens, variable focal length lens group, the CMOS chip of spacing arrangement；The focal length of first convex lens is 10mm~25mm；The focal length of first concavees lens is 20mm~30mm；The focal length of second concavees lens is 5mm~10mm；The focal length of second convex lens is 5mm~12mm；The focal length of variable focal length lens group is 30mm~50mm；COMS chips are 1/4 inch, Pixel Dimensions 3um, and its corresponding image space resolution ratio is 83lp/mm.Present invention has the advantages that：Work in coordination without zoom group state and compensation configuration is needed and realize varifocal function；It is easy to use, while zoom can be achieved in rapid accurate, compact of focusing, and common iris recognition object lens under close structure.
Description
Technical field
The present invention relates to a kind of iris identification equipment, more particularly to a kind of zoom iris recognition object lens.
Background technology
In the case where the strategy of rejuvenating China by applying scientific and technological advances is guided, the biology such as fingerprint recognition, personal recognition, recognition of face, DNA detections discerns technology
Socially it is widely applied, has played important function in practice.But these technologies all have some limitations.
For example, the accuracy rate of fingerprint recognition is relatively low；Face lift face, after making up, then None- identified；DNA equipment is expensive, during check fee, takes
Money etc..Iris recognition technology because with accuracy is high, stability is good, high-speed and high-efficiency the advantages of widely approved rapidly,
However, iris recognition object lens used in the market in general iris recognition product, its operating distance is all fixed, and this brings
Unfavorable effect be exactly the operating distance for needing people close to iris recognition object lens, the process of iris recognition can be realized.And pin
To Asian's eye iris feature, effectively human eye iris region can be imaged using 840-860nm light source, therefore iris recognition
Object lens will be especially effective using the design of the wave band.In general objective with variable focal length, all it is that the position for changing lens obtains focal length
Change, so having to cooperative mechanical structure could realize, while, it is necessary to corresponding motor, control if driving
Getting up can be very slow.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of zoom iris recognition object lens, solve what prior art provided
The operating distance of iris recognition object lens is all fixed, and the operating distance that user must be close to iris recognition object lens could be realized
Iris recognition, operating distance is short, and existing objective with variable focal length, is all that the position for changing lens obtains the change of focal length, must
Palpus cooperative mechanical structure causes to control the problem of slow with corresponding motor.
The technical scheme that the present invention solves above-mentioned technical problem is as follows, a kind of zoom iris recognition object lens, including same successively
The first convex lens, the first concavees lens, the second concavees lens, the second convex lens, variable focal length lens group, the CMOS cores of distance between axles arrangement
Piece；The focal length of first convex lens is 10mm~25mm；The focal length of first concavees lens is -20mm~-30mm；Described
The focal length of two concavees lens is -5mm~-10mm；The focal length of second convex lens is 5mm~12mm；The variable focal length lens group
Focal length be -30mm~-50mm；The refractive index of first convex lens is 1.6~1.8；The refractive index of first concavees lens
For 1.7~1.85；The refractive index of second concavees lens is 1.4~1.6；The refractive index of second convex lens be 1.7~
1.9；The center thickness of first convex lens is 1mm~5mm；The first concavees lens center thickness is 1mm~3mm；It is described
The center thickness of second concavees lens is 1mm~5mm；The center thickness of second convex lens is 1mm~5mm；The varifocal
The center thickness of lens group is 3mm~6mm；The CMOS chip is 1/4 inch, and Pixel Dimensions are 3 μm, its corresponding image space point
Resolution is 83lp/mm.
Further：The variable focal length lens group includes liquid lens, the liquid lens include that coaxial fitting sets the
One liquid material and the second liquid material, the refractive index of first liquid material is 1.2~1.4；Second liquid
The refractive index of state material layer is 1.4~1.6；The liquid lens are by changing the surface curvature in first liquid material
Different focal lengths is obtained with the center thickness of first liquid material and second liquid material.
Further：Second liquid material is being inner concave with the joint place of first liquid material；It is described
First liquid material is being arcuate surface corresponding with inner concave with the joint place of second liquid material.
Further：The variable focal length lens group also includes described for protecting located at the first liquid material outer end
First glassy layer of the first liquid material and located at the second liquid material outer end be used for protect second liquid
Second glassy layer of material layer.
Further：The distance between first convex lens and first concavees lens d1 are 2mm~8mm；Described first
The distance between concavees lens and second concavees lens d2 are 1mm~5mm；Second concavees lens and second convex lens it
Between distance d3 be 0.5mm~2mm；The distance between second convex lens and the variable focal length lens group d4 be 1mm~
3mm；The distance d5 of the variable focal length lens group and the CMOS chip is 5mm~12mm.
The beneficial effects of the invention are as follows：
1st, it is simple in construction, work in coordination without zoom group state and compensation configuration is needed and realize varifocal function；
2nd, very significantly the operating distance scope of iris identification equipment is lifted and arrives 232mm, and other in general irises
The operating distance scope for identifying object lens is about 10mm；
3rd, image quality is excellent, and it is as 1/4 cun CMOS of the matter more than 3 μm demand, high resolution；
4th, the change of focal length can be realized under conditions of no lens distance using modification, use is quite convenient, together
When focus rapid accurate, compact, and zoom, application can be achieved in common iris recognition object lens under close structure
Extensively.
Brief description of the drawings
Fig. 1 is structure principle chart of the present invention；
Fig. 2 is the structure principle chart of variable focal length lens group；
Fig. 3 is modulation transfer function curve map when object lens operating distance is 485mm；
Fig. 4 is point range figure when object lens operating distance is 485mm；
Fig. 5 is curvature of field distortion figure when object lens operating distance is 485mm；
Fig. 6 is modulation transfer function curve map when object lens operating distance is 340mm；
Fig. 7 is point range figure when object lens operating distance is 340mm；
Fig. 8 is curvature of field distortion figure when object lens operating distance is 340mm；
Fig. 9 is modulation transfer function curve map when object lens operating distance is 253mm；
Figure 10 is point range figure when object lens operating distance is 253mm；
Figure 11 is curvature of field distortion figure when object lens operating distance is 253mm；
1 in figure, the first convex lens；2, the first concavees lens；3, the second concavees lens；4, the second convex lens；5, variable focal length lens
Group；51, the first liquid material；52, the second liquid material；53, the first glassy layer；54, the second glassy layer；6, CMOS cores
Piece；D1, the distance between the first convex lens and first concavees lens；D2, between the first concavees lens and second concavees lens
Distance；D3, the distance between the second concavees lens and second convex lens；D4, the second convex lens and the variable focal length lens
The distance between group；The distance of d5, variable focal length lens group and the CMOS chip.
Embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1 and Figure 2, a kind of zoom iris recognition object lens, including sequentially coaxially spacing arrangement the first convex lens 1,
First concavees lens 2, the second concavees lens 3, the second convex lens 4, variable focal length lens group 5, CMOS chip 6；First convex lens 1
Focal length is 10mm~25mm；The focal length of first concavees lens 2 is -20mm~-30mm；The focal length of second concavees lens 3 for-
5mm~-10mm；The focal length of second convex lens 4 is 5mm~12mm；The focal length of the variable focal length lens group 5 be -30mm~-
50mm；The refractive index of first convex lens 1 is 1.6~1.8；The refractive index of first concavees lens 2 is 1.7~1.85；Institute
The refractive index for stating the second concavees lens 3 is 1.4~1.6；The refractive index of second convex lens 4 is 1.7~1.9；Described first is convex
The center thickness of lens 1 is 1mm~5mm；The center thickness of first concavees lens 2 is 1mm~3mm；Second concavees lens 3
Center thickness is 1mm~5mm；The center thickness of second convex lens 4 is 1mm~5mm；In the variable focal length lens group 5
Heart thickness is 3mm~6mm；The CMOS chip is 1/4 inch, and Pixel Dimensions are 3 μm, and its corresponding image space resolution ratio is
83lp/mm。
The variable focal length lens group 5 includes liquid lens, and the liquid lens include the first liquid that coaxial fitting is set
The liquid material 52 of material layer 51 and second, the refractive index of first liquid material 51 is 1.2~1.4；Second liquid
The refractive index of state material layer 52 is 1.4~1.6；The liquid lens are by changing the surface curvature in the first liquid material 51
Different focal lengths is obtained with the center thickness of the first liquid material 51 and the second liquid material 52.
Second liquid material 52 is being inner concave with the joint place of first liquid material 51；Described first
Liquid material 51 is being arcuate surface corresponding with inner concave with the joint place of second liquid material 52；In zooming procedure
In center thickness and the first liquid in the second liquid material 52 are brought due to the change of the surface curvature of the first liquid material 51
The center thickness of state material layer 51 changes therewith.The variable focal length lens group 5 also includes being located at first liquid material 51
Outer end be used for protect the first glassy layer 53 of first liquid material 51 and outside second liquid material 52
Second glassy layer 54 for being used to protect second liquid material 52 at end.
The distance between first convex lens 1 and first concavees lens 2 d1 are 2mm~8mm；First concavees lens
The distance between 2 and second concavees lens 3 d2 are 1mm~5mm；Between second concavees lens 3 and second convex lens 4
Distance d3 be 0.5mm~2mm；The distance between second convex lens 4 and the variable focal length lens group 5 d4 be 1mm~
3mm；The distance d5 of the variable focal length lens group 5 and the CMOS chip 6 is 5mm~12mm.
Be not only simple in structure using this structure design, and without need zoom group state and compensation configuration work in coordination
Realize varifocal function；The change of focal length can be realized under conditions of no lens distance using modification, use is quite square
Just, while rapid accurate, the compact of focusing, and common iris recognition object lens can be achieved to become under close structure
Jiao, it is widely used.
Now it is illustrated so that the operating distance of the zoom iris recognition object lens of the present invention is 485mm, 340mm and 253mm as an example
The actual effect reached：
When operating distance is 485mm：
As shown in Fig. 3,4,5, the image quality of all visual fields of whole camera lens is consistent as can see from Figure 3, MTF curve
In compact a branch of, and mtf value is more than 0.4 under 83lp/mm.Disc of confusion as seen from Figure 4 under each visual field is smaller, says
The picture of the bright image-forming objective lens is of fine quality good.The surface curvature of field is less than 0.05mm as seen from Figure 5, and each visual field that distorts is both less than 1%.
When operating distance is 340mm：
As shown in Fig. 6,7,8, the image quality of all visual fields of whole camera lens is consistent as can see from Figure 6, MTF curve
In it is compact it is a branch of reach diffraction limit, and mtf value is more than 0.7 under 83lp/mm.As can see from Figure 7 under each visual field
Disc of confusion it is smaller, illustrate that the picture of the image-forming objective lens is of fine quality good.The surface curvature of field is less than 0.05mm as seen from Figure 8, and distortion is each
Visual field is both less than 1%.
When operating distance is 253mm：
As shown in Fig. 9,10,11, the image quality of all visual fields of whole camera lens is consistent as can see from Figure 9, and MTF is bent
Line in it is compact it is a branch of reach diffraction limit, and mtf value is more than 0.4 under 83lp/mm.As seen from Figure 10 under each visual field
Disc of confusion it is smaller, illustrate that the picture of the image-forming objective lens is of fine quality good.The surface curvature of field is less than 0.1mm as seen from Figure 11, and distortion is each
Visual field is both less than 0.5%.
It can be drawn from experimental result above, zoom iris recognition object lens of the invention very significantly set iris recognition
232mm is arrived in standby operating distance scope lifting, and the operating distance scope of other in general iris recognition object lens is about 10mm；And
Image quality is excellent, and it is as 1/4 cun CMOS of the matter more than 3 μm demand, high resolution.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (2)
- A kind of 1. zoom iris recognition object lens, it is characterised in that：By the first convex lens (1) of sequentially coaxially spacing arrangement, first Concavees lens (2), the second concavees lens (3), the second convex lens (4), variable focal length lens group (5), CMOS chip (6) composition；Described The focal length of one convex lens (1) is 10mm~25mm；The focal length of first concavees lens (2) is -20mm~-30mm；Described second The focal length of concavees lens (3) is -5mm~-10mm；The focal length of second convex lens (4) is 5mm~12mm；The varifocal is saturating The focal length of microscope group (5) is -30mm~-50mm；The refractive index of first convex lens (1) is 1.6~1.8；Described first is recessed The refractive index of mirror (2) is 1.7~1.85；The refractive index of second concavees lens (3) is 1.4~1.6；Second convex lens (4) refractive index is 1.7~1.9；The center thickness of first convex lens (1) is 1mm~5mm；First concavees lens (2) Center thickness is 1mm~3mm；The center thickness of second concavees lens (3) is 1mm~5mm；Second convex lens (4) Center thickness is 1mm~5mm；The center thickness of the variable focal length lens group (5) is 3mm~6mm；The CMOS chip is 1/4 Inch, Pixel Dimensions are 3 μm, and its corresponding image space resolution ratio is 83lp/mm；The variable focal length lens group is made up of liquid lens, and the liquid lens include two layers of liquid material, is respectively coaxial patch Close the first liquid material (51) and the second liquid material (52) set, the refractive index of first liquid material (51) For 1.2~1.4；The refractive index of second liquid material (52) is 1.4~1.6；The liquid lens are by changing first Surface curvature and the center thickness of the first liquid material and the second liquid material in liquid material is different to obtain Focal length；Second liquid material (52) is inner concave in the joint place with first liquid material (51)；Described first Liquid material (51) is being arcuate surface corresponding with inner concave with the joint place of second liquid material (52)；Described The distance between one convex lens (1) and first concavees lens (2) (d1) are 2mm~8mm；First concavees lens (2) and institute It is 1mm~5mm to state the distance between the second concavees lens (3) (d2)；Second concavees lens (3) and second convex lens (4) The distance between (d3) be 0.5mm~2mm；The distance between second convex lens (4) and the variable focal length lens group (5) (d4) it is 1mm~3mm；The distance (d5) of the variable focal length lens group (5) and the CMOS chip (6) is 5mm~12mm.
- A kind of 2. zoom iris recognition object lens according to claim 1, it is characterised in that：The variable focal length lens group (5) Also include the first glass for being used to protect first liquid material (51) located at the first liquid material (51) outer end Glass layer (53) and located at the second liquid material (52) outer end be used for protect the of second liquid material (52) Two glassy layers (54).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510888819.0A CN105372795B (en) | 2015-12-04 | 2015-12-04 | A kind of zoom iris recognition object lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510888819.0A CN105372795B (en) | 2015-12-04 | 2015-12-04 | A kind of zoom iris recognition object lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105372795A CN105372795A (en) | 2016-03-02 |
| CN105372795B true CN105372795B (en) | 2018-04-10 |
Family
ID=55375132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510888819.0A Expired - Fee Related CN105372795B (en) | 2015-12-04 | 2015-12-04 | A kind of zoom iris recognition object lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105372795B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383015A (en) * | 2001-04-23 | 2002-12-04 | 清华大学 | Lens of biochip scanning-detecting system |
| CN103257430A (en) * | 2012-02-15 | 2013-08-21 | 大立光电股份有限公司 | Optical lens |
| CN205176369U (en) * | 2015-12-04 | 2016-04-20 | 武汉虹识技术有限公司 | Iris discernment objective zoom |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130003455A (en) * | 2011-06-30 | 2013-01-09 | 엘지이노텍 주식회사 | Imaging lens |
-
2015
- 2015-12-04 CN CN201510888819.0A patent/CN105372795B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383015A (en) * | 2001-04-23 | 2002-12-04 | 清华大学 | Lens of biochip scanning-detecting system |
| CN103257430A (en) * | 2012-02-15 | 2013-08-21 | 大立光电股份有限公司 | Optical lens |
| CN205176369U (en) * | 2015-12-04 | 2016-04-20 | 武汉虹识技术有限公司 | Iris discernment objective zoom |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105372795A (en) | 2016-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI407183B (en) | Image capturing lens assembly | |
| TWI438476B (en) | Image capturing system | |
| TWI447471B (en) | Image capturing lens assembly | |
| CN109946822A (en) | Optical imaging lens | |
| TWI475246B (en) | Optical lens assembly with filter member for image taking | |
| CN109725408A (en) | Imaging lens | |
| TW201229554A (en) | Image pickup optical lens assembly | |
| JP2017517756A (en) | Wide-angle imaging lens | |
| TW201224571A (en) | Imagery optical system | |
| CN103257434A (en) | Imaging lens | |
| CN108681034A (en) | Optical imaging lens | |
| TW201234037A (en) | Optical image capturing system | |
| TW201229612A (en) | Optical imaging lens assembly | |
| CN107505696B (en) | Flat field apochromatic micro objective | |
| TW201235696A (en) | Optical image capturing lens system | |
| TW201321791A (en) | Optical system | |
| CN107608057A (en) | Imaging lens system group | |
| CN205176369U (en) | Iris discernment objective zoom | |
| TWI471595B (en) | Optical zoom lens assembly | |
| TWI690724B (en) | Optical lens | |
| CN106896482A (en) | Iris lens | |
| CN107102428A (en) | A kind of high definition machine visual lens | |
| CN105372795B (en) | A kind of zoom iris recognition object lens | |
| CN109116536A (en) | A kind of optical system of 15X industrial microscope | |
| CN207336906U (en) | Imaging lens system group |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| 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: 20180410 Termination date: 20181204 |