CN208795915U - The iris recognition camera lens of big field of view angle - Google Patents
The iris recognition camera lens of big field of view angle Download PDFInfo
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- CN208795915U CN208795915U CN201821442008.3U CN201821442008U CN208795915U CN 208795915 U CN208795915 U CN 208795915U CN 201821442008 U CN201821442008 U CN 201821442008U CN 208795915 U CN208795915 U CN 208795915U
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Abstract
The utility model relates to a kind of iris recognition camera lenses of big field of view angle, it is characterized in that, including having of being sequentially arranged from the object side to image side along optical axis positive light coke and object side are convex surface and image side surface is the first lens of concave surface, with negative power and object side and image side surface are the second lens of concave surface, the third lens with positive light coke, the 4th lens with negative power, first lens, second lens, the third lens and the 4th lens are plastic aspherical element eyeglass, diaphragm is equipped between first lens and the second lens, second lens are made of the plastic material of high refractive index, refractive index N>1.63, and effective pixel area catercorner length half IH and lens optical overall length TTL meet following relational expression: 0.35<IH/TTL<0.42 on lens imaging face.It meets iris recognition and requires and precisely shoot in insufficient light iris, and camera lens parses power height, distorts small.
Description
Technical field
The utility model relates to a kind of iris recognition camera lenses of big field of view angle, are suitable for smart phone or laptop
Deng iris recognition system for unlocking.
Background technique
With the innovation and concealed promotion of unlocking technology, iris recognition replaces fingerprint as the head of smart electronics element
Choosing.This requires the camera lens arranged in pairs or groups therewith parses, power is also higher and higher, and distortion is small, and iris can clearly be imaged.Existing iris recognition
Technology is risen in smart phone, laptop etc., and the multiple fields such as following privacy device, important protective door are answered
With also inevitable meeting is attached most importance to iris recognition technology.This requires cameras to meet other than above-mentioned requirements, moreover it is possible to light not
It is shot in sufficient situation, can accurately shoot iris.
Summary of the invention
The purpose of this utility model be to provide for it is a kind of meet iris recognition require and in insufficient light precisely
The iris recognition camera lens of the big field of view angle of iris is shot, camera lens parses power height, distorts small.
The technical solution of the utility model is:
A kind of iris recognition camera lens of big field of view angle, is characterized in that, including from the object side to image side successively along optical axis
Arrangement with positive light coke and object side is convex surface and image side surface is the first lens of concave surface, with negative power and object side
It is the second lens, the third lens with positive light coke, the 4th lens with negative power of concave surface with image side surface, it is described
First lens, the second lens, the third lens and the 4th lens are plastic aspherical element eyeglass, first lens and the second lens
Between be equipped with diaphragm, second lens are made of the plastic material of high refractive index, refractive index N > 1.63, and on lens imaging face
Effective pixel area catercorner length half IH and lens optical overall length TTL meet following relational expression: 0.35 < IH/TTL < 0.42.
The iris recognition camera lens of above-mentioned big field of view angle, the effective clear aperature Y1 and the aperture of the diaphragm of first lens
Y meets following relational expression: 1.46 < Y1/Y < 1.512.Above formula makes camera lens light-inletting quantity in the case where F/# is certain become larger, general mirror
Head is that diaphragm is preposition, identical F/#, but light-inletting quantity is small, and the use condition of the camera lens has the place of insufficient light, so guaranteeing logical
Light quantity is sufficiently large.
The iris recognition camera lens of above-mentioned big field of view angle, the stop position between the first lens and the second lens,
And effective clear aperature Y2 of distance ts and the second lens meets following relational expression on axis of the diaphragm away from the second lens: 0.225≤
ts/Y2≤0.294。
Above formula illustrates stop position, effectively reduces the susceptibility of the eyeglass of manufacturing tolerance.
The iris recognition camera lens of above-mentioned big field of view angle, the effective focal length f2 of second lens and the focal length f of camera lens
Meet following relational expression: -1.112≤f2/f < -0.8.
Second lens are high-index material, and the ratio range of refracting power and camera lens effective focal length is conducive to correcting chromatic aberration
And the curvature of field.
The iris recognition camera lens of above-mentioned big field of view angle, the effective focal length f4 of the 4th lens and the focal length f of camera lens
Meet following relational expression: -1.194≤f4/f≤- 0.951.
Above formula determines L4Focal power, meet this relational expression and be conducive to the reasonable distribution of focal power and reach shortening overall length, control
Aberration processed achievees the purpose that actual operation requirements.
The iris recognition camera lens of above-mentioned big field of view angle, on the axis of second lens away from the first lens distance ct1 with
Distance ct3 meets following relational expression: 1.552≤ct3/ct1≤2.132 on axis of the third lens away from the 4th lens.
Second lens are high-index material, and above formula limits the position range of the second lens, are more than lower limit value, are conducive to
Miniaturization, but, it is unfavorable for the curvature of field that makes corrections, above formula effectively corrects the curvature of field.
The iris recognition camera lens of above-mentioned big field of view angle, distance ct1, on the axis of second lens away from the first lens
Two lens are away from distance ct3 and lens optical overall length on the axis of distance ct2, the third lens away from the 4th lens on the axis of the third lens
TTL meets following relational expression: 0.393≤(ct1+ct2+ct3)/TTL≤0.478.
Above formula defines three pieces eyeglass sum of the distance and overall length ratio range before camera lens, is conducive to the cooperation between eyeglass,
In addition the positive negative and positive combination of refracting power reduces aberration, and proposes high parsing power.
The iris recognition camera lens of above-mentioned big field of view angle, the radius of curvature r21 of the object side of second lens and
The radius of curvature r22 of the image side surface of two lens meets following relational expression: 0.408≤(r21-r22)/(r21+r22) < 5.94.
Above formula defines the bending degree of the second eyeglass, is more than the upper limit, is unfavorable for assembling tolerance, is lower than lower limit, reduces
Camera lens susceptibility can be effectively reduced in diopter, above formula, improve the yield of assembling.
The iris recognition camera lens of above-mentioned big field of view angle, the radius of curvature r11 of the object side of first lens and
The radius of curvature r12 of the image side surface of one lens meets following relational expression: 0.238≤r11/r12≤0.265.
Above formula defines the focal power and bending degree relationship of L1, meets the reasonable distribution that this relational expression is conducive to focal power
Reach shortening overall length, control aberration achievees the purpose that actual operation requirements.
The beneficial effects of the utility model are:
1, stop position determines the incident angle of chief ray and image planes, and the diaphragm of camera lens described in the utility model is located at the
Between one lens and the second lens, is i.e. behind the first lens, the light-inletting quantity of camera lens is increased, enables camera lens in dark
Normal use under environment.
2, the utility model camera lens uses the eyeglass of four aspherical plastic materials, reduces difficulty of processing and is produced into
Sheet, and use is aspherical, can be good at the aberration for reducing each position in image planes in this optical system, especially distortion control
System, to obtain better image analytic ability.Specifically, distance ct1, second on the axis of second lens away from the first lens
Lens are away from distance ct3 and lens optical overall length TTL on the axis of distance ct2, the third lens away from the 4th lens on the axis of the third lens
Meet following relational expression: 0.393≤(ct1+ct2+ct3)/TTL≤0.478；The effective focal length f2 and camera lens of second lens
Focal length f meet following relational expression: -1.112≤f2/f < -0.8；The radius of curvature r21 of the object side of second lens and
The radius of curvature r22 of the image side surface of two lens meets following relational expression: 0.408≤(r21-r22)/(r21+r22) < 5.94, and
For camera lens using positive and negative combined form and the reasonable distribution of mirror distance between commutator segments and focal power, the camera lens that is significantly increased parses power.
3, due on the axis of second lens away from the first lens on the axis of distance ct1 and the third lens away from the 4th lens away from
Meet following relational expression: 1.552≤ct3/ct1≤2.132 from ct3.The radius of curvature r21 of the object side of second lens with
The radius of curvature r22 of the image side surface of second lens meets following relational expression: 0.408≤(r21-r22)/(r21+r22) < 5.94.
Realize that maximum field of view angle is 42 °, optics overall length 5.7mm, maximum half image height are 2.4mm, f-number F/2.2, maximum picture circle are
The bright camera lens of the big field angle of φ 4.8mm.
4, convenient for molding and structure design in the structure of eyeglass.Production is considered in system optimization, is increased to being
The optimization for tolerance of uniting simulates to obtain yield 85% or more according to conventional maximum production tolerance.Small structure can be wide
General is applied to electronic product.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the camera lens of the utility model；
Fig. 2 is the X-Y scheme of the camera lens of the utility model embodiment 1；
Fig. 3 is the chromaticity difference diagram of the camera lens of the utility model embodiment 1, for indicating the light of different wave length via optical system
System convergence focus departure degree, abscissa is chromatic longitudiinal aberration value (unit um), and ordinate is visual field；
Fig. 4 is the astigmatism curvature of field indicatrix of the camera lens of the utility model embodiment 1, for indicate meridianal image surface bending and
Sagitta of arc line face bending degree, abscissa are the curvature of field (unit um), and ordinate is visual field；
Fig. 5 is the optical distortion curve of the camera lens of the utility model embodiment 1, for indicating the distortion under different field angles
Value, abscissa are distortion value %, and ordinate is visual field；
Fig. 6 is the X-Y scheme of the camera lens of the utility model embodiment 2；
Fig. 7 is the chromaticity difference diagram of the camera lens of the utility model embodiment 2；
Fig. 8 is the astigmatism curvature of field indicatrix of the camera lens of the utility model embodiment 2；
Fig. 9 is the optical distortion curve of the camera lens of the utility model embodiment 2；
Figure 10 is the X-Y scheme of the camera lens of the utility model embodiment 3；
Figure 11 is the chromaticity difference diagram of the camera lens of the utility model embodiment 3；
Figure 12 is the astigmatism curvature of field indicatrix of the camera lens of the utility model embodiment 3；
Figure 13 is the optical distortion curve of the camera lens of the utility model embodiment 3；
In figure: the first lens of L1., the second lens of L2., L3. the third lens, the 4th lens of L4.；Stop. diaphragm；IR-
Cut. optical filter；
1. the first lens object side, 2. first lens image side surfaces, 4. second lens object sides, 5. second lens image side surfaces,
6. the third lens object side, 7. the third lens image side surfaces, 8. the 4th lens object sides, 9. the 4th lens image side surfaces, 10. optical filters
Object side, 11. optical filter image side surfaces, 12. image planes.
Specific embodiment
Embodiment 1
As shown in Figure 1, the iris recognition camera lens of the big field of view angle, including what is be sequentially arranged from the object side to image side along optical axis
With positive light coke and object side is convex surface and image side surface is the first lens L1 of concave surface, has negative power and object side and picture
Side is the second lens L2, the third lens L3 with positive light coke, the 4th lens L4 with negative power of concave surface.Institute
Stating the first lens L1, the second lens L2, the third lens L3 and the 4th lens L4 is plastic aspherical element eyeglass, first lens
The centre of L1 and the second lens L2 are equipped with diaphragm, and the 4th rear portion lens L4 is equipped with optical filter, and the second lens L2 is reflected by height
The plastic material of rate is made, refractive index N > 1.63.
The camera lens satisfies the following conditional expression:
0.35<IH/TTL<0.42
1.46<Y1/Y<1.512
0.225≤ts/Y2≤0.294
-1.112≤f2/f<-0.8
-1.194≤f4/f≤-0.951
1.552≤ct3/ct1≤2.132
0.393≤(ct1+ct2+ct3)/TTL≤0.478
0.408≤(r21-r22)/(r21+r22)<5.94
0.238≤r11/r12≤0.265
Wherein, IH is that effective pixel area catercorner length half, TTL are lens optical overall length, Y is on lens imaging face
Focal length that the aperture of the diaphragm, Y1 are effective clear aperature of the first lens, Y2 is the second lens effective clear aperature, f are camera lens,
F2 is the effective focal length of the second lens, f4 is the effective focal length of the 4th lens, ts be distance on axis of the diaphragm away from the second lens,
It away from distance, ct3 on the axis of the third lens is third that ct1, which is that distance, ct2 are the second lens on axis of second lens away from the first lens,
Distance, the radius of curvature for the object side that r11 is the first lens, the image side that r12 is the first lens on axis of the lens away from the 4th lens
The radius of curvature in face, r21 are the radius of curvature of the radius of curvature of the object side of the second lens, the image side surface that r22 is the second lens.
Four lens of the utility model are even aspheric surface, and each asphericity coefficient meets following equation:
Z=cy2/ [1+ { 1- (1+k) c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+A16y16+A18y18+
A20y20
Wherein, Z is aspherical rise, c is aspherical paraxial curvature, y is camera lens aperture, k is circular cone coefficient, A4It is 4 times
Asphericity coefficient, A6For 6 asphericity coefficients, A8For 8 asphericity coefficients, A10For 10 asphericity coefficients, A12It is non-for 12 times
Asphere coefficient, A14For 14 asphericity coefficients, A16For 16 asphericity coefficients, A18For 18 asphericity coefficients, A20It is non-for 20 times
Asphere coefficient.
In the present embodiment, the object side of the first lens is the biggish convex surface of curvature；The object side of the third lens is convex surface, as
It is concave surface at the distal shaft of side, paraxial place is convex surface；The object side of 4th lens is concave surface, and the paraxial place of image side surface is concave surface, distal shaft
Place is convex surface.
The design parameter of the lens group of the present embodiment please refers to table 1 and table 4.
Table 1 (a)
| Surface serial number | Surface type | Curvature | Thickness | Material | Circular cone coefficient |
| obj | Spherical surface | It is infinite | 500 | ||
| 1 | It is aspherical | 1.823434 | 1.065 | 1.54,56.1 | -0.85727 |
| 2 | It is aspherical | 6.881795 | 0.433791 | 16.62953 | |
| stop | Spherical surface | 1.00E+18 | 0.308478 | ||
| 4 | It is aspherical | 19.80995 | 0.369832 | 1.64,23.5 | 99 |
| 5 | It is aspherical | 2.899817 | 0.406379 | 1.305242 | |
| 6 | It is aspherical | -40 | 0.398156 | 1.54,56.1 | -20.5275 |
| 7 | It is aspherical | -3.75759 | 1.269547 | 4.395213 | |
| 8 | It is aspherical | -12.8521 | 0.363095 | 1.53,56.1 | 9.537699 |
| 9 | It is aspherical | 5.002699 | 0.415203 | -98.0782 | |
| 10 | Spherical surface | It is infinite | 0.21 | BK7_SCHOTT | |
| 11 | Spherical surface | It is infinite | 0.460518 | ||
| 12 | Spherical surface | It is infinite | 0 |
Table 1 (b) (asphericity coefficient table)
| Surface serial number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 1 | 0.015098 | 0.001185 | 0.008512 | -0.02299 | 0.036253 | -0.03263 | 0.016809 |
| 2 | -0.0141 | 0.002497 | -0.02629 | 0.098791 | -0.19709 | 0.221353 | -0.14174 |
| 4 | -0.15572 | 0.026291 | 0.265109 | -1.40745 | 4.514287 | -8.70101 | 9.825765 |
| 5 | -0.1554 | 0.017029 | 0.367774 | -1.38528 | 3.355962 | -5.05859 | 4.577846 |
| 6 | 0.009288 | 0.012943 | -0.00539 | 0.09488 | -0.12574 | 0.04952 | 0.013817 |
| 7 | 0.060914 | 0.02147 | 0.061469 | -0.19056 | 0.401876 | -0.48125 | 0.317218 |
| 8 | -0.10037 | 0.103872 | -0.11735 | 0.116482 | -0.07915 | 0.034409 | -0.00911 |
| 9 | -0.03407 | -0.00907 | 0.018499 | -0.0138 | 0.006965 | -0.0026 | 0.000664 |
In the present embodiment, full filed angle is 42 °, and aperture F value is 2.2, (the eyeglass front end to picture lens optical overall length TTL
The distance in face) it is 5.7mm.Other data for being related to conditional refer to table 4.
Referring to Fig. 3, indicate that the chromatic longitudiinal aberration of lens imaging system, chromatic longitudiinal aberration indicate each face in the entire image planes of system
The difference of color wavelength focal position, chromatic longitudiinal aberration is smaller, indicates better, the vertical axis of optical system of each color wavelength light convergence
Color difference control is within 2um.
Referring to fig. 4, different curves represent different wavelength, and S represents Sagittal field curvature, and T represents meridianal curvature of field, and the two makes the difference just
It is the astigmatism of system, astigmatism and the curvature of field are the important aberrations for influencing the outer field rays of axis, and astigmatism crosses conference and seriously affects view outside axis
The image quality of field, the curvature of field will cause center and peripheral imaging not in a plane.From the point of view of curve in figure, in all visual fields
The curvature of field and astigmatism be corrected within 0.01mm.
Referring to Fig. 5, the distortion curve of camera lens is indicated, distortion does not influence the clarity of picture, but can cause system variant, this is
System distortion is less than 2%, to Imaging very little.
Embodiment 2
In the present embodiment, referring to Fig. 6, camera lens composition is same as Example 1, and the first lens have positive light coke, object side
For convex surface, image side surface is concave surface；Second lens have negative power, and object side and image side surface are concave surface；The third lens have
Positive light coke, object side are convex surface, and image side surface is concave surface；4th lens have negative power, and object side and image side surface have
The point of inflexion, the paraxial place in object side are concave surface, are convex surface at distal shaft, and it is convex surface at distal shaft that the paraxial place of image side surface, which is concave surface,.
The specific design parameter of lens group please refers to table 2 and table 4.
Table 2 (a)
Table 2 (b) (asphericity coefficient table)
In the present embodiment, full filed angle is 42 °, and aperture F value is 2.2, and lens optical overall length TTL is 5.7mm.Other are related to
The data of conditional refer to table 4.
Referring to Fig. 7, indicate that the chromatic longitudiinal aberration of lens imaging system, chromatic longitudiinal aberration indicate each face in the entire image planes of system
The difference of color wavelength focal position, chromatic longitudiinal aberration is smaller, indicates better, the vertical axis of optical system of each color wavelength light convergence
Color difference control is within 2um.
Referring to Fig. 8, different curves represent different wavelength, and S represents Sagittal field curvature, and T represents meridianal curvature of field, and the two makes the difference just
It is the astigmatism of system, astigmatism and the curvature of field are the important aberrations for influencing the outer field rays of axis, and astigmatism crosses conference and seriously affects view outside axis
The image quality of field, the curvature of field will cause center and peripheral imaging not in a plane.From the point of view of curve in figure, in all visual fields
The curvature of field and astigmatism be corrected within 0.01mm
Referring to Fig. 9, the distortion curve of camera lens is indicated, distortion does not influence the clarity of picture, but can cause system variant, this is
System distortion is less than 2%, to Imaging very little.
Embodiment 3
Referring to Figure 10, camera lens composition is same as Example 1, and the first lens have positive light coke, object side picture for convex surface
Side is concave surface；Second lens have negative power, and object side and image side surface are concave surface；The third lens have positive light coke,
The paraxial place in object side is concave surface, is convex surface at distal shaft, and it is concave surface at distal shaft that the paraxial place of image side surface, which is convex surface,；4th lens have
Negative power, object side and image side surface have the point of inflexion, and it is concave surface at distal shaft, image side surface is close that the paraxial place in object side, which is convex surface,
It is concave surface at axis, is convex surface at distal shaft.4th lens are in M type.
The specific design parameter of lens group please refers to table 3 and table 4.
Table 3 (a)
Table 3 (b) (asphericity coefficient table)
| Surface serial number | A4 | A6 | A8 | A10 |
| 1 | 1.17E-02 | 1.33E-03 | 3.54E-04 | -3.30E-05 |
| 2 | -1.50E-02 | 2.92E-03 | -5.84E-04 | 2.83E-05 |
| 4 | -1.32E-01 | 1.34E-02 | 4.73E-02 | -2.03E-02 |
| 5 | -1.98E-01 | 5.01E-02 | 2.11E-02 | -8.64E-03 |
| 6 | 6.29E-02 | -1.58E-02 | 1.59E-02 | -4.75E-03 |
| 7 | 2.43E-02 | 4.03E-02 | -2.14E-03 | -3.21E-03 |
| 8 | -8.61E-02 | 4.01E-02 | -8.12E-03 | 7.88E-04 |
| 9 | -6.50E-02 | 1.69E-02 | -3.07E-03 | 1.85E-04 |
In the present embodiment, full filed angle is 42 °, and aperture F value is 2.2, and lens optical overall length TTL is 5.7mm.Other are related to
The data of conditional refer to table 4.
Referring to Figure 11, indicate that the chromatic longitudiinal aberration of lens imaging system, chromatic longitudiinal aberration indicate each face in the entire image planes of system
The difference of color wavelength focal position, chromatic longitudiinal aberration is smaller, indicates better, the vertical axis of optical system of each color wavelength light convergence
Color difference control is within 2um.
Referring to Figure 12, different curves represent different wavelength, and S represents Sagittal field curvature, and T represents meridianal curvature of field, and the two makes the difference
It is exactly the astigmatism of system, astigmatism and the curvature of field are the important aberrations for influencing the outer field rays of axis, and astigmatism is crossed conference and seriously affected outside axis
The image quality of visual field, the curvature of field will cause center and peripheral imaging not in a plane.From the point of view of curve in figure, all visual fields
The interior curvature of field and astigmatism is corrected within 0.01mm.
Referring to Figure 13, the distortion curve of camera lens is indicated, distortion does not influence the clarity of picture, but can cause system variant, this
Systematical distortion is less than 2%, to Imaging very little.
Table 4
| Lens design parameter | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| IH/TTL | 0.4 | 0.4 | 0.4 |
| Y | 1.902 | 1.908 | 1.826 |
| Y1/Y | 1.493 | 1.468 | 1.511 |
| Ts | 0.308 | 0.232 | 0.308 |
| ts/Y2 | 0.294 | 0.225 | 0.286 |
| f2 | -6.38 | -4.465 | -5.723 |
| f4 | -5.749 | -6.841 | -5.424 |
| f2/f | -1.112 | -0.797 | -1.004 |
| f4/f | -1.002 | -1.194 | -0.951 |
| ct3/ct1 | 1.71 | 2.132 | 1.552 |
| (ct1+ct2+ct3)/TTL | 0.424 | 0.393 | 0.478 |
| (r21-r22)/(r21+r22) | 0.744 | 5.939 | 0.408 |
| r11/r12 | 0.265 | 0.239 | 0.238 |
Claims (9)
1. a kind of iris recognition camera lens of big field of view angle, which is characterized in that including being sequentially arranged from the object side to image side along optical axis
With positive light coke and object side is convex surface and image side surface is the first lens of concave surface, has negative power and object side and picture
Side is the second lens, the third lens with positive light coke, the 4th lens with negative power of concave surface, and described first
Lens, the second lens, the third lens and the 4th lens are plastic aspherical element eyeglass, between first lens and the second lens
Equipped with diaphragm, second lens are made of the plastic material of high refractive index, refractive index N > 1.63, and on lens imaging face effectively
Pixel region catercorner length half IH and lens optical overall length TTL meet following relational expression: 0.35 < IH/TTL < 0.42.
2. the iris recognition camera lens of big field of view angle according to claim 1, which is characterized in that first lens have
Effect clear aperature Y1 and aperture of the diaphragm Y meet following relational expression: 1.46 < Y1/Y < 1.512.
3. the iris recognition camera lens of big field of view angle according to claim 1, which is characterized in that the stop position is
Between one lens and the second lens, and effective clear aperature Y2 of distance ts and the second lens is full on axis of the diaphragm away from the second lens
The following relational expression of foot: 0.225≤ts/Y2≤0.294.
4. the iris recognition camera lens of big field of view angle according to claim 1, which is characterized in that second lens have
The focal length f of effect focal length f2 and camera lens meets following relational expression: -1.112≤f2/f < -0.8.
5. the iris recognition camera lens of big field of view angle according to claim 1, which is characterized in that the 4th lens have
The focal length f of effect focal length f4 and camera lens meets following relational expression: -1.194≤f4/f≤- 0.951.
6. the iris recognition camera lens of big field of view angle according to claim 1, which is characterized in that second lens are away from
Distance ct3 meets following relational expression on the axis of distance ct1 and the third lens away from the 4th lens on the axis of one lens: 1.552≤
ct3/ct1≤2.132。
7. the iris recognition camera lens of big field of view angle according to claim 1, which is characterized in that second lens are away from
Distance ct1 on the axis of one lens, the second lens are away from the axis of the third lens on the axis of distance ct2, the third lens away from the 4th lens
Distance ct3 and lens optical overall length TTL meet following relational expression: 0.393≤(ct1+ct2+ct3)/TTL≤0.478.
8. the iris recognition camera lens of big field of view angle according to claim 1, which is characterized in that the object of second lens
The radius of curvature r22 of the image side surface of the radius of curvature r21 and the second lens of side meets following relational expression: 0.408≤(r21-
r22)/(r21+r22)<5.94。
9. the iris recognition camera lens of big field of view angle according to claim 1, which is characterized in that the object of first lens
The radius of curvature r12 of the image side surface of the radius of curvature r11 and the first lens of side meets following relational expression: 0.238≤r11/r12
≤0.265。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109116514A (en) * | 2018-09-04 | 2019-01-01 | 辽宁中蓝电子科技有限公司 | The iris recognition camera lens of big field of view angle |
| CN110850554A (en) * | 2019-11-14 | 2020-02-28 | 武汉虹识技术有限公司 | Imaging lens and iris recognition device |
-
2018
- 2018-09-04 CN CN201821442008.3U patent/CN208795915U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109116514A (en) * | 2018-09-04 | 2019-01-01 | 辽宁中蓝电子科技有限公司 | The iris recognition camera lens of big field of view angle |
| CN110850554A (en) * | 2019-11-14 | 2020-02-28 | 武汉虹识技术有限公司 | Imaging lens and iris recognition device |
| CN110850554B (en) * | 2019-11-14 | 2021-08-20 | 武汉虹识技术有限公司 | Imaging lens and iris recognition device |
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Effective date of registration: 20201203 Address after: 124000 No. 388 North China Road, Xinglongtai District, Panjin City, Liaoning Province Patentee after: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Address before: 124000 Xinglongtai District, Panjin, Liaoning Province, China Road East Patentee before: LIAONING ZHONGLAN ELECTRONIC TECHNOLOGY Co.,Ltd. |
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Denomination of utility model: Iris recognition lens with large field of view Effective date of registration: 20210726 Granted publication date: 20190426 Pledgee: China Construction Bank Corporation Panjin branch Pledgor: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Registration number: Y2021210000049 |
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