CN106680970A - Unmanned plane lens - Google Patents
Unmanned plane lens Download PDFInfo
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- CN106680970A CN106680970A CN201611094826.4A CN201611094826A CN106680970A CN 106680970 A CN106680970 A CN 106680970A CN 201611094826 A CN201611094826 A CN 201611094826A CN 106680970 A CN106680970 A CN 106680970A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention discloses an unmanned plane lens, and the lens sequentially comprises a front lens group, an aperture diaphragm and a rear lens group from the object space to the image space. The aperture diaphragm is located at the central part of the lens. The front lens group comprises a first lens with the negative focal length, a second lens with the negative focal length and a third lens with the positive focal length, wherein the first, second and third lenses are sequentially arranged from the object space to the image space. One surface, facing the object space, of each of the first, second and third lenses in the front lens group is a convex surface, and the surfaces, facing the image space, of the first and second lenses are concave surfaces. One surface, facing the image space, of the third lens is a convex surface. The rear lens group comprises a fourth lens with the positive focal length, a fifth lens with the negative focal length and a sixth lens with the positive focal length, wherein the fourth lens, the fifth lens and the sixth lens are sequentially arranged from the object space to the image space. One surface, facing the image space, of each lens of the rear lens group is a convex lens. The surfaces, facing the object space, of the fourth and sixth lenses are convex surfaces, and one surface, facing the object space, of the fifth lens is a concave surface. The lens provided by the invention is low in distortion, is big in view angle, is high in resolution, and is strong in capability of resisting the environment temperature changes.
Description
Technical field
The present invention relates to a kind of optical lens, more particularly to a kind of optical imaging lens for unmanned plane.
Background technology
Along with the extensive use of unmanned plane, general unmanned plane camera lens can only be to some side in the same time
To content carry out image record, it is extremely limited to shoot picture, and causes to be clapped by camera lens itself resolution ratio is not high when shooting
Fogging image is taken the photograph, acutance and stereovision are very poor, while unmanned plane lens distortion is very big, cause anamorphose, also existed
The shortcomings of volume is big.I.e. existing unmanned plane camera lens all has that the angle of visual field is small, resolution ratio is low, acutance and stereovision are poor, abnormal
The shortcomings of change is big, volume is big.
The A of Chinese patent literature CN 105403982 are in a kind of high as matter is used for nobody disclosed on 03 16th, 2016
Machine is taken photo by plane optical imaging lens, and the A of Chinese patent literature CN 105372789 are in a kind of disclosed on 03 02nd, 2016
Undistorted high-resolution large-viewing angle unmanned plane lens optical system, it is more all to there is lens wearer number in it, that is, exist bulky
Shortcoming.
The content of the invention
It is strong that the purpose of the present invention aims to provide a kind of low distortion, big visual angle, high-resolution and environment resistant temperature change capabilities
Unmanned plane camera lens, to overcome weak point of the prior art.
By a kind of unmanned plane camera lens that this purpose is designed, its architectural feature is to include front lens successively from the object side to image side
Group, aperture diaphragm and rear lens group, aperture diaphragm are located at the middle part of camera lens；
Wherein, the front lens group includes setting gradually from the object side to image side the first lens of negative focal length, negative focal length
3rd lens of the second lens, positive focal length, each lens in the front lens group towards thing side one side be convex surface, the first lens and
Second lens towards image planes side be concave surface, the 3rd lens towards image planes side be convex surface；
It is the 4th lens of positive focal length that the rear lens group includes setting gradually from the object side to image side, the 5th of negative focal length the saturating
6th lens of mirror, positive focal length, each lens in the rear lens group towards image side one side be convex surface, the 4th lens and the 6th saturating
Mirror towards object plane side be convex surface, the 5th lens towards object plane side be concave surface.
Further, the focal length of first lens is f1, and the focal length of the second lens is f2, and it meets relational expression：1.2<f1/
f2<3.5。
Further, the focal length of second lens is f2, and the focal length of the 6th lens is f6, and it meets relational expression：-0.7<
f2/f6<-0.3。
Further, the focal length of first lens is f1, and the focal length of the 6th lens is f6, and it meets relational expression：-1.8<
f1/f6<-0.3。
Further, the focal length of the front lens group is fg1, and rear lens group focal length is fg2, and it meets relational expression：0.8<
fg1/fg2<1.5。
Further, first lens, the 3rd lens, the 4th lens and the 5th lens are all glass spheric glass, second
Lens and the 6th lens are Glass aspheric eyeglass, and aperture diaphragm is arranged between the 3rd lens and the 4th lens.
Further, the preceding surface of second lens is convex surface, and the preceding surface of the second lens is oval aspherical；Second
The semiaperture on the preceding surface of lens is SD3, and the rise on the preceding surface of the second lens is Sag3, and it meets relational expression：0<Sag3/
SD3<0.45。
Further, the rear surface of second lens is concave surface, and the rear surface of the second lens is oval aspherical；Second
The semiaperture on the rear surface of lens is SD4, and the rise on the rear surface of the second lens is Sag4, and it meets relational expression：0<Sag4/
SD4<0.75。
Further, the 6th lens are convex surface towards the preceding surface of thing side, and the preceding surface of the 6th lens is hyperbola
Aspherical, the semiaperture on the preceding surface of the 6th lens is SD11, and the rise on the preceding surface of the 6th lens is Sag11, and it meets pass
It is formula：-0.025<Sag11/SD11<0.09.
Further, the 6th lens are convex surface towards the rear surface of image side, and the rear surface of the 6th lens is oblate non-
Sphere, the semiaperture on the rear surface of the 6th lens is SD12, and the rise on the rear surface of the 6th lens is Sag12, and it meets relation
Formula：-0.25<Sag12/SD12<0.
Further, the refractive index of first lens is n1, and the Abbe number of the first lens is v1, and it meets relational expression：4.7
<n1+ln(v1)<6。
Further, the refractive index of second lens is n2, and the refractive index of the 3rd lens is n3, the refractive index of the 6th lens
It is n6, the Abbe number of the second lens is v2, and the Abbe number of the 3rd lens is v3, and the Abbe number of the 6th lens is v6, and it meets pass
It is formula：
2.4<n2+v2/40.5<3.5；
2.4<n3+v3/40.5<3.5；
2.4<n6+v6/40.5<3.5。
Further, the refractive index of the 5th lens is n5, and the Abbe number of the 5th lens is v5, and it meets relational expression：4.2
<n5+ln(v5)<5.3。
Further, the 4th lens and the 5th lens are the focal length difference of balsaming lens, the 4th lens and the 5th lens
It is f4 and f5, it meets relational expression：
3.5<n4/f4+0.05*v4<5.5；
-2<n5/f5-0.045*v5<-0.7。
Further, the spacing between first lens and the second lens be D1, between the first lens and image plane between
Away from being TL, it meets relational expression：D1/TL<0.25.
Further, the total focal length of the camera lens is f, and the spacing between the first lens and image plane is TL, and it meets relation
Formula：f/TL<0.3.
Further, the spacing between first lens and the second lens is D1, between the second lens and the 3rd lens
Space D 2, the spacing between the first lens and image plane is TL, and it meets relational expression：
0.2<(D1+D2)/TL<0.3。
Further, the center thickness of first lens is T1, and the center thickness of the second lens is T2, and it meets relation
Formula：0.2<T1/T2<0.8.
Further, the center thickness of second lens is T2, and the center thickness of the 6th lens is T6, and it meets relation
Formula：1<T2/T6<1.5.
The present invention uses diverging meniscus lens, the second lens using the double gauss structure for advantageously reducing distortion, the first lens
Using negative bent moon non-spherical lens, the 6th lens use non-spherical lens, and two pieces of non-spherical lenses all away from diaphragm, main to use
In image planes chief ray incidence angles are reduced, lifting resisting temperature changing capability and reduction distort so that the distortion of whole unmanned plane camera lens
2% small distortion numerical value can be reached.
The present invention uses six slice structures, includes front lens group, aperture diaphragm, rear lens group successively from the object side to image side.
Aperture diaphragm is located at camera lens middle part, and front lens group is made up of three pieces of lens, is mainly used in reducing distortion, reduces the outer visual field key light of axle
Angle of the line relative to optical axis；Rear lens group is made up of three pieces of lens, is mainly used in reducing aberration, and lifting reduces image planes as matter
Chief ray incidence angles.
The present invention is simultaneously by the way of spheric glass and aspherical lens mix and match；First lens and the second lens are
Negative meniscus lens, the 4th lens and the 5th lens using the balsaming lens for advantageously reducing aberration, the second lens and the 6th saturating
Mirror is using aspherical so that whole unmanned plane camera lens has the big visual field at 100 ° of full visual angle and less aberration value, can reach
The high-resolution of 16000000 pixels, it is ensured that acutance and stereovision that the unmanned plane camera lens has had, while having less image planes
Chief ray incident angle so that the color reducibility of whole unmanned plane camera lens is more uniform.
The present invention is made each in unmanned plane camera lens using the distribution of rational focal power, the arrangement of sphere and aspherical lens
The focal length and tolerance distributing equilibrium of lens, effectively reduce number of lenses, shorten the length of unmanned plane camera lens, reduce structure tolerance quick
Release Sensitivity Problem.
The knot that the present invention passes through reasonably combined different thermal characteristics material, reasonable arrangement spheric glass and aspherical lens
Structure position, the resisting temperature changing capability with whole unmanned plane camera lens solves the problems, such as that camera lens temperature focus are drifted about,
Image analysis ability high is kept within the scope of larger temperature, product competitiveness is improve, the use occasion of product is increased.
In sum, the present invention uses the arrangement of the distribution of rational focal power, sphere and aspherical lens, the unmanned plane for making
The focal length and tolerance distributing equilibrium of each lens in camera lens, reduce structure tolerance sensitivity problem；And also cause it is whole nobody
Machine camera lens has the big visual field at 100 ° of full visual angle, 2% or so low distortion value, the high-resolution of 16,000,000 pixels, it is ensured that the nothing
Acutance and stereovision that man-machine camera lens has had, while having less image planes chief ray incident angle so that whole unmanned plane
The color reducibility of camera lens is more uniform.
Brief description of the drawings
Fig. 1 is the lens schematic diagram of one embodiment of the invention.
Fig. 2 is the first analysis diagram of first embodiment.
Fig. 3 is the second analysis diagram of first embodiment.
Fig. 4 schemes for the Spot of first embodiment.
Fig. 5 is the curvature of field distortion figure of first embodiment.
Fig. 6 is the chief ray angle figure of first embodiment.
Fig. 7 is the analysis diagram when low temperature of first embodiment is subzero 20 DEG C.
Fig. 8 is the analysis diagram when high temperature of first embodiment is above freezing 60 DEG C.
Fig. 9 is the first analysis diagram of second embodiment.
Figure 10 is the second analysis diagram of second embodiment.
Figure 11 schemes for the Spot of second embodiment.
Figure 12 is the curvature of field distortion figure of second embodiment.
Figure 13 is the chief ray angle figure of second embodiment.
Figure 14 is the analysis diagram when high temperature of second embodiment is above freezing 60 DEG C.
Figure 15 is the analysis diagram when low temperature of second embodiment is subzero 20 DEG C.
Figure 16 is the first analysis diagram of 3rd embodiment.
Figure 17 is the second analysis diagram of 3rd embodiment.
Figure 18 schemes for the Spot of 3rd embodiment.
Figure 19 is the curvature of field distortion figure of 3rd embodiment.
Figure 20 is the analysis diagram when low temperature of 3rd embodiment is subzero 20 DEG C.
Figure 21 is the analysis diagram when high temperature of 3rd embodiment is above freezing 60 DEG C.
Figure 22 is the rise of first embodiment and the ratio relation figure in radius hole.
Figure 23 is the rise of second embodiment and the ratio relation figure in radius hole.
Figure 24 is the rise of 3rd embodiment and the ratio relation figure in radius hole.
In figure：G1 is front lens group, and G2 is rear lens group, and L1 is the first lens, and L2 is the second lens, and L3 is the 3rd saturating
Mirror, L4 is the 4th lens, and L5 is the 5th lens, and L45 is balsaming lens, and L6 is the 6th lens, and S1 is the preceding surface of the first lens,
S2 is the rear surface of the first lens, and S3 is the preceding surface of the second lens, and S4 is the rear surface of the second lens, and S5 is the 3rd lens
Preceding surface, S6 is the rear surface of the 3rd lens, and S7 is aperture diaphragm, and S8 is the preceding surface of the 4th lens, and S9 is the 4th lens
Surface afterwards, S10 is the rear surface of the 5th lens, and S11 is the preceding surface of the 6th lens, and S12 is the rear surface of the 6th lens, S13
It is the preceding surface of IR eyeglasses, S14 is the rear surface of IR eyeglasses, and S15 is the surface of image plane.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
First embodiment
Referring to Fig. 1-Fig. 8 and Figure 22, this unmanned plane camera lens includes front lens group G1, aperture light successively from the object side to image side
Late Aperture Stop and rear lens group G2, aperture diaphragm be located at camera lens middle part, wherein, the front lens group G1 include from
First lens L1 of the negative focal length that thing side sets gradually to image side, the second lens L2 of negative focal length, the 3rd lens L3 of positive focal length,
Each lens in the front lens group G1 are convex surface towards thing side one side, and the first lens L1 and the second lens L2 is towards image planes side
Be concave surface, the 3rd lens L3 towards image planes side be convex surface；The rear lens group G2 includes what is set gradually from the object side to image side
4th lens L4 of positive focal length, the 5th lens L5 of negative focal length, the 6th lens L6 of positive focal length, it is each in the rear lens group G2
Lens towards image side one side be convex surface, the 4th lens L4 and the 6th lens L6 towards object plane side be convex surface, the 5th lens L5 courts
It is concave surface to object plane side；F1 is the focal length of the first lens L1, and f2 is the focal length of the second lens L2；Have 1.2<f1/f2<3.5.
The first lens L1 and the second lens L2 are the negative lens for bending towards thing side, are mainly used in reducing distortion.
Second lens L2 of the negative focal length and the 6th lens L6 of positive focal length are non-spherical lens, and are arranged far from
The position of aperture diaphragm, is mainly used in reducing image planes chief ray incidence angles, and lifting resisting temperature changing capability and reduction distort.
The focal length of the front lens group G1 is fg1, and rear lens group G2 focal lengths are fg2, and the focal length of the 6th lens L6 is f6, its
Meet relational expression：-0.7<f2/f6<-0.3；-1.8<f1/f6<-0.3；0.8<fg1/fg2<1.5.
The first lens L1, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 are glass spheric glass, second
Lens L2 and the 6th lens L6 is Glass aspheric eyeglass, and aperture diaphragm is arranged between the 3rd lens L3 and the 4th lens L4.
The first lens L1, the second lens L2, the 3rd lens L3, the 4th lens L4, the 5th lens L5 and the 6th lens
L6 refractive indexes and Abbe number respectively are n1, n2, n3, n4, n5, n6, v1, v2, v3, v4, v5 and v6, and it meets relational expression：
4.7<n1+ln(v1)<6；
2.4<n2+v2/40.5<3.5；
2.4<n3+v3/40.5<3.5；
2.4<n6+v6/40.5<3.5；
4.2<n5+ln(v5)<5.3。
The 4th lens L4 and the 5th lens L5 is balsaming lens, and the focal length of the 4th lens L4 and the 5th lens L5 is distinguished
It is f4 and f5, it meets relational expression：
3.5<n4/f4+0.05*v4<5.5；
-2<n5/f5-0.045*v5<-0.7。
The front surface S 3 of the second lens L2 is convex surface, and the rear surface S4 of the second lens L2 is concave surface, the second lens L2
Front surface S 3 and rear surface S4 be it is oval aspherical；6th lens L6 towards thing side front surface S 11 be convex surface, the 6th
The front surface S 11 of lens L6 is that hyperbola is aspherical, and rear surface S12s of the 6th lens L6 towards image side is convex surface, and the 6th is saturating
The rear surface S12 oblatenesses of mirror L6 are aspherical；Wherein, the front surface S 3 of the second lens L2 and rear surface S4 and the 6th lens L6
The semiaperture and rise of front surface S 11 and rear surface S12 be respectively SD3, SD4, SD11, SD12, Sag3, Sag4, Sag11,
Sag12；It meets relational expression：
0<Sag3/SD3<0.45；
0<Sag4/SD4<0.75；
-0.025<Sag11/SD11<0.09；
-0.25<Sag12/SD12<0。
Spacing between the first lens L1 and the second lens L2 is D1, between the second lens L2 and the 3rd lens L3
Space D 2, the spacing between the first lens L1 and image plane Image Plane is TL, and the total focal length of camera lens is f；It meets relation
Formula：
D1/TL<0.25；
f/TL<0.3；
0.2<(D1+D2)/TL<0.3。
The first lens L1, the center thickness of the second lens L2 and the 6th lens L6 respectively are T1, T2 and T6,
Have：
0.2<T1/T2<0.8；
1<T2/T6<1.5。
In the present embodiment, when working substance is away from WD=1m, the total focal length f=3.47mm of unmanned plane camera lens, aperture F#=
2.82, FOV=100 ° of the angle of visual field, during camera lens overall length TL=24.94mm,
| f1 | f2 | f3 | f4 | f5 | f6 | fg1 | fg2 |
| -13.66 | -5.86 | 6.44 | 5.8 | -6.11 | 10.2 | 10.33 | 9.12 |
| f1/f2 | f2/f6 | f1/f6 | fg1/fg2 |
| 2.33 | -0.57 | -1.34 | 1.13 |
| K | A | B | C | D | E | |
| S3 | -0.29 | 3.35E-03 | -2.78E-04 | 1.65E-05 | -8.54E-07 | 1.80E-08 |
| S4 | -0.51 | 7.31E-03 | -8.55E-04 | 6.60E-05 | -1.76E-05 | 9.22E-07 |
| S11 | -16.3 | -8.86E-04 | -2.17E-04 | -9.74E-06 | 1.26E-06 | -9.78E-08 |
| S12 | 12.89 | 6.16E-05 | -2.26E-04 | -3.81E-06 | -8.23E-07 | -4.11E-08 |
| n1+ln(v1) | n2+v2/40.5 | n3+v3/40.5 | n6+v6/40.5 | n5+ln(v5) |
| 5.51 | 2.98 | 2.9 | 2.98 | 4.79 |
| D1/TL | f/TL | (D1+D2)/TL | T1/T2 | T2/T6 | n4/f4+0.05*v4 | n5/f5-0.045*v5 |
| 0.07 | 0.14 | 0.25 | 0.41 | 1.14 | 4.76 | -1.13 |
In above-mentioned each table, n is refractive index, and R is radius of curvature, and the first lens L1~the 6th lens L6 focal lengths successively are f1
~f6, fg1 are the focal length of front lens group G1, and fg2 is the focal length of rear lens group G2, and D is interval between eyeglass, and T is lens thickness, TL
Be the camera lens overall length of unmanned plane camera lens, f is the lens focus of unmanned plane camera lens, FOV represents full filed, F# refers to aperture, K, A, B,
C, D, E are asphericity coefficient.
MTF, normal temperature defocusing curve when Fig. 2 to Fig. 8 and Figure 22 are respectively working substance away from WD=1m, point range figure, the curvature of field are abnormal
Become figure, -20 DEG C of low temperature, the ratio relation figure of high temperature 60 DEG C of defocusing curves, rise and semiapertures, it can be seen that first
The unmanned plane camera lens that embodiment is provided has low distortion, the big angle of visual field, high-resolution, good color reducibility, strong resisting temperature
The advantages such as changing capability.
Second embodiment
Referring to Fig. 9-Figure 15 and Figure 23, in the present embodiment, when working substance is away from WD=1m, the total focal length f of unmanned plane camera lens
=3.5mm, aperture F#=2.85, FOV=100 ° of full filed, during the camera lens overall length TL=25.1mm of unmanned plane camera lens,
| K | A | B | C | D | E | |
| S3 | 1.7214 | 4.47E+03 | -3.24E-04 | 2.11E-05 | -9.68E-07 | 1.64E-08 |
| S4 | -0.6078 | 1.09E-02 | -7.73E-04 | 1.46E-04 | -2.11E-05 | 9.26E-05 |
| S11 | -9.575 | -1.22E-04 | -1.43E-04 | -1.86E-06 | 2.44E-06 | -1.36E-07 |
| S12 | -5.53E+10 | 2.10E-04 | -2.63E-04 | -3.57E-06 | 9.65E-07 | -4.95E-08 |
| n1+ln(v1) | n2+v2/40.5 | n3+v3/40.5 | n6+v6/40.5 | n5+ln(v5) |
| 5.51 | 2.8 | 2.9 | 3.17 | 4.79 |
| D1/TL | f/TL | (D1+D2)/TL | T1/T2 | T2/T6 | n4/f4+0.05*v4 | n5/f5-0.045*v5 |
| 0.05 | 0.14 | 0.24 | 0.68 | 1.38 | 4.75 | -1.06 |
In above-mentioned each table, n is refractive index, and R is radius of curvature, and the first lens L1~the 6th lens L6 focal lengths successively are f1
~f6, fg1 are the focal length of front lens group G1, and fg2 is the focal length of rear lens group G2, and D is interval between eyeglass, and T is lens thickness, TL
Be the camera lens overall length of unmanned plane camera lens, f is the lens focus of unmanned plane camera lens, FOV represents full filed, F# refers to aperture, K, A, B,
C, D, E are asphericity coefficient.
MTF, normal temperature defocusing curve when Fig. 9 to Figure 15 and Figure 23 are respectively working substance away from WD=1m, point range figure, the curvature of field are abnormal
Become figure, -20 DEG C of low temperature, the ratio relation figure of high temperature 60 DEG C of defocusing curves, rise and semiapertures, it can be seen that second
The unmanned plane camera lens that embodiment is provided has low distortion, the big angle of visual field, high-resolution, good color reducibility, strong resisting temperature
The advantages such as changing capability.
3rd embodiment
Referring to Figure 16-Figure 21 and Figure 24, in the present embodiment, as total focal length f of the working substance away from WD=1m unmanned plane camera lenses
=3.37mm, aperture F#=2.82, FOV=100 °, during TL=25.1mm,
| f1/f2 | f2/f6 | f1/f6 | fg1/fg2 |
| 3.29 | -0.59 | -1.95 | 1.18 |
| K | A | B | C | D | E | |
| S3 | -0.3 | 2.51E-03 | -3.17E-04 | 1.92E-05 | -8.32E-07 | 1.61E-08 |
| S4 | -0.52 | 5.59E-03 | -1.42E-03 | 1.42E-03 | -1.99E-05 | 9.26E-07 |
| S11 | -16 | 1.80E-04 | -3.24E-04 | -1.14E-05 | 1.95E-06 | -1.36E-07 |
| S12 | 13 | 1.37E-03 | -4.11E-04 | 5.49E-06 | 7.27E-07 | -4.95E-08 |
| n1+ln(v1) | n2+v2/40.5 | n3+v3/40.5 | n6+v6/40.5 | n5+ln(v5) |
| 5.51 | 2.98 | 2.9 | 2.98 | 4.79 |
| D1/TL | f/TL | (D1+D2)/TL | T1/T2 | T2/T6 | n4/f4+0.05*v4 | n5/f5-0.045*v5 |
| 0.04 | 0.13 | 0.25 | 0.66 | 1.2 | 4.74 | -1.11 |
Below to be listed in first embodiment to 3rd embodiment, each conditional meets the condition of table below：
In above-mentioned each table, n is refractive index, and R is radius of curvature, and the first lens L1~the 6th lens L6 focal lengths successively are f1
~f6, fg1 are the focal length of front lens group G1, and fg2 is the focal length of rear lens group G2, and D is interval between eyeglass, and T is lens thickness, TL
Be the camera lens overall length of unmanned plane camera lens, f is the lens focus of unmanned plane camera lens, FOV represents full filed, F# refers to aperture, K, A, B,
C, D, E are asphericity coefficient.
Figure 16 to Figure 21 and Figure 24 distorts for MTF when working substance is away from WD=1m, normal temperature defocusing curve, point range figure, the curvature of field
Figure, -20 DEG C of low temperature, the ratio relation figure of high temperature 60 DEG C of defocusing curves, rise and semiapertures, it can be seen that the 3rd is real
Applying the unmanned plane camera lens that example provided has above-mentioned low distortion, the big angle of visual field, high-resolution, good color reducibility, strong temperature resistance
The advantages such as degree changing capability.
Asphericity coefficient used in it uses and formula is calculated as below：
In formula, r is that Z is rise of this along optical axis direction, and c is the surface a little to the distance of optical axis on optical surface
Curvature, k is the quadratic surface constant on the surface, and as k ＜ -1, the face shape curve of lens is hyperbola；As k=-1, thoroughly
The face shape curve of mirror is parabola；As -1 ＜ k ＜ 0, the face shape curve of lens is ellipse；As k=0, the face shape of lens is bent
Line is circle；As 0 ＜ k, the face shape curve of lens is oblateness.
General principle of the invention and principal character and advantages of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not limited to the above embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (19)
1. a kind of unmanned plane camera lens, it is characterized in that include successively from the object side to image side front lens group (G1), aperture diaphragm and it is rear thoroughly
Microscope group (G2), aperture diaphragm is located at the middle part of camera lens；
Wherein, the front lens group (G1) includes first lens (L1) of the negative focal length for setting gradually from the object side to image side, negative Jiao
Away from the second lens (L2), positive focal length the 3rd lens (L3), each lens in the front lens group (G1) towards thing side simultaneously
It is convex surface, the first lens (L1) and the second lens (L2) are concave surface towards image planes side, and the 3rd lens (L3) are towards image planes side
It is convex surface；
The of the 4th lens (L4) of positive focal length that the rear lens group (G2) includes setting gradually from the object side to image side, negative focal length
6th lens (L6) of five lens (L5), positive focal length, each lens in the rear lens group (G2) are simultaneously convex surface towards image side,
4th lens (L4) and the 6th lens (L6) towards object plane side be convex surface, the 5th lens (L5) towards object plane side be concave surface.
2. unmanned plane camera lens according to claim 1, it is characterized in that the focal length of first lens (L1) is f1, second is saturating
The focal length of mirror (L2) is f2, and it meets relational expression：1.2<f1/f2<3.5.
3. unmanned plane camera lens according to claim 1, it is characterized in that the focal length of second lens (L2) is f2, the 6th is saturating
The focal length of mirror (L6) is f6, and it meets relational expression：-0.7<f2/f6<-0.3.
4. unmanned plane camera lens according to claim 1, it is characterized in that the focal length of first lens (L1) is f1, the 6th is saturating
The focal length of mirror (L6) is f6, and it meets relational expression：-1.8<f1/f6<-0.3.
5. unmanned plane camera lens according to claim 1, it is characterized in that the focal length of the front lens group (G1) is fg1, afterwards thoroughly
Microscope group (G2) focal length is fg2, and it meets relational expression：0.8<fg1/fg2<1.5.
6. unmanned plane camera lens according to claim 1, it is characterized in that first lens (L1), the 3rd lens (L3),
Four lens (L4) and the 5th lens (L5) are all glass spheric glass, and the second lens (L2) and the 6th lens (L6) are glass aspheric
Face eyeglass, aperture diaphragm is arranged between the 3rd lens (L3) and the 4th lens (L4).
7. unmanned plane camera lens according to claim 1, it is characterized in that the preceding surface (S3) of second lens (L2) is convex
Face, the preceding surface (S3) of the second lens (L2) is oval aspherical；The semiaperture on the preceding surface (S3) of the second lens (L2) is
SD3, the rise on the preceding surface (S3) of the second lens (L2) is Sag3, and it meets relational expression：0<Sag3/SD3<0.45.
8. unmanned plane camera lens according to claim 1, it is characterized in that the rear surface (S4) of second lens (L2) is recessed
Face, the rear surface (S4) of the second lens (L2) is oval aspherical；The semiaperture on the rear surface (S4) of the second lens (L2) is
SD4, the rise on the rear surface (S4) of the second lens (L2) is Sag4, and it meets relational expression：0<Sag4/SD4<0.75.
9. unmanned plane camera lens according to claim 1, it is characterized in that preceding surface of the 6th lens (L6) towards thing side
(S11) it is convex surface, the preceding surface (S11) of the 6th lens (L6) is that hyperbola is aspherical, the preceding surface of the 6th lens (L6)
(S11) semiaperture is SD11, and the rise on the preceding surface (S11) of the 6th lens (L6) is Sag11,
It meets relational expression：-0.025<Sag11/SD11<0.09.
10. unmanned plane camera lens according to claim 1, it is characterized in that rear surface of the 6th lens (L6) towards image side
(S12) it is convex surface, the rear surface (S12) of the 6th lens (L6) is oblate aspherical, the rear surface (S12) of the 6th lens (L6)
Semiaperture be SD12, the rise on the rear surface (S12) of the 6th lens (L6) is Sag12, and it meets relational expression：-0.25<
Sag12/SD12<0。
11. unmanned plane camera lenses according to claim 1, it is characterized in that the refractive index of first lens (L1) is n1, the
The Abbe number of one lens (L1) is v1,
It meets relational expression：4.7<n1+ln(v1)<6.
12. unmanned plane camera lenses according to claim 1, it is characterized in that the refractive index of second lens (L2) is n2, the
The refractive index of three lens (L3) is n3, and the refractive index of the 6th lens (L6) is n6, and the Abbe number of the second lens (L2) is v2, the 3rd
The Abbe number of lens (L3) is v3, and the Abbe number of the 6th lens (L6) is v6, and it meets relational expression：
2.4<n2+v2/40.5<3.5；
2.4<n3+v3/40.5<3.5；
2.4<n6+v6/40.5<3.5。
13. unmanned plane camera lenses according to claim 1, it is characterized in that the refractive index of the 5th lens (L5) is n5, the
The Abbe number of five lens (L5) is v5,
It meets relational expression：4.2<n5+ln(v5)<5.3.
14. unmanned plane camera lenses according to claim 1, it is characterized in that the 4th lens (L4) and the 5th lens (L5) are
The focal length of balsaming lens, the 4th lens (L4) and the 5th lens (L5) is respectively f4 and f5, and it meets relational expression：
3.5<n4/f4+0.05*v4<5.5；
-2<n5/f5-0.045*v5<-0.7。
15. unmanned plane camera lenses according to claim 1, it is characterized in that first lens (L1) and the second lens (L2) it
Between spacing be D1, spacing of the first lens (L1) and image plane between be TL, it meets relational expression：D1/TL<0.25.
16. unmanned plane camera lenses according to claim 1, it is characterized in that the total focal length of the camera lens is f, the first lens (L1)
Spacing between image plane is TL, and it meets relational expression：f/TL<0.3.
17. unmanned plane camera lenses according to claim 1, it is characterized in that first lens (L1) and the second lens (L2) it
Between spacing be D1, the space D 2 between the second lens (L2) and the 3rd lens (L3), the first lens (L1) are and image plane between
Spacing be TL,
It meets relational expression：0.2<(D1+D2)/TL<0.3.
18. unmanned plane camera lenses according to claim 1, it is characterized in that the center thickness of first lens (L1) is T1,
The center thickness of the second lens (L2) is T2,
It meets relational expression：0.2<T1/T2<0.8.
The 19. unmanned plane camera lens according to claim 1 to 18, it is characterized in that the center thickness of second lens (L2) is
T2, the center thickness of the 6th lens (L6) is T6,
It meets relational expression：1<T2/T6<1.5.
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| CN201611094826.4A CN106680970B (en) | 2016-12-02 | 2016-12-02 | Unmanned aerial vehicle camera lens |
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