CN106908938A - A kind of aspherical fish eye lens - Google Patents
A kind of aspherical fish eye lens Download PDFInfo
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- CN106908938A CN106908938A CN201710216525.2A CN201710216525A CN106908938A CN 106908938 A CN106908938 A CN 106908938A CN 201710216525 A CN201710216525 A CN 201710216525A CN 106908938 A CN106908938 A CN 106908938A
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
A kind of aspherical fish eye lens, the 5th lens and the 6th lens of negative power of the first lens of positive light coke, the second lens of negative power, the 3rd lens of positive light coke, the 4th lens of positive light coke, positive light coke are disposed with along light incident direction, first lens, the second lens, the 3rd lens constitute preceding group of lens of negative power, 4th lens, the 5th lens, the 6th lens constitute rear group of lens of positive light coke, and diaphragm is located between preceding group of lens and rear group lens；Preceding group of lens, diaphragm, afterwards group lens, filter, image planes collectively form optical system, be less than 8mm from total length of the first optical surface of optical system to image planes, the angle of visual field of optical system is more than 180 °.The present invention realizes the miniaturization of optical system while fine aberration correction；And the reasonable distribution for passing through focal power, on the premise of ensureing as matter, temperature in use is expanded to 0 DEG C~50 DEG C, while reduces cost, improves the market competitiveness.
Description
Technical field
The present invention relates to optical system and device design field, more particularly to a kind of aspherical fish eye lens.
Background technology
The fish-eye structure for often using at present is usually to be made up of 8~11 eyeglasses, be common are：7 group of 8 chip knot
Structure, 8 group of 10 slice structure, also just like Chinese patent literature CN104101989 A, Chinese patent literature CN105445910
A uses 11 lens to reach lens performance requirement, but, this fish-eye optics overall length is more long, it is impossible to meet small
The requirement of type, and it may not apply to low temperature environment, it is impossible to solve the problems, such as that high/low temperature parses focus drifting.
The content of the invention
The purpose of the present invention aims to provide that a kind of optics overall length is smaller, good imaging quality aspherical fish eye lens, with gram
Take weak point of the prior art.
By a kind of aspherical fish eye lens that this purpose is designed, its architectural feature is disposed with along light incident direction
First lens of positive light coke, the second lens of negative power, the 3rd lens of positive light coke, the 4th lens of positive light coke,
5th lens and the 6th lens of negative power of positive light coke, wherein, the first lens, the second lens, the 3rd lens constitute negative
Preceding group of lens of focal power, the 4th lens, the 5th lens, the 6th lens constitute rear group of lens of positive light coke, and diaphragm is located at preceding
Between group lens and rear group lens；Preceding group of lens, diaphragm, afterwards group lens, filter, image planes collectively form optical system, from optics
First optical surface of system is less than 8mm to the total length of image planes, and the angle of visual field of optical system is more than 180 °.
After using above-mentioned technical scheme, by repeatedly testing repeatedly, after the whole proportional scaling of optical system, matter is imaged
Amount is still good.
Further, first lens be Glass aspheric, the second lens, the 3rd lens, the 4th lens, the 5th lens and
6th lens are that plastic cement is aspherical；First optical surface and the second optical surface of the 3rd lens, the first optics of the 5th lens
Surface dorsad diaphragm；First optical surface and the second optical surface of the first lens, the first optical surface of the second lens and
Second optical surface, the first optical surface of the 4th lens and the second optical surface, the second optical surface, the 6th of the 5th lens
First optical surface and the second optical surface of lens bend towards diaphragm.
By controlling the relative aperture of the optical surface of above-mentioned each lens, so that reduce chief ray drift angle, it is abnormal to reach its
Become the particular/special requirement less than 100%.
Further, described along light incident direction, the circular cone whose conic coefficient of the first optical surface of the first lens is
k1,
The circular cone whose conic coefficient of the second optical surface of the first lens is k2,
The circular cone whose conic coefficient of the first optical surface of the second lens is k3,
The circular cone whose conic coefficient of the second optical surface of the second lens is k4,
The circular cone whose conic coefficient of the first optical surface of the 3rd lens is k5,
The circular cone whose conic coefficient of the second optical surface of the 3rd lens is k6,
The circular cone whose conic coefficient of the optical surface of diaphragm is k7,
The circular cone whose conic coefficient of the first optical surface of the 4th lens is k8,
The circular cone whose conic coefficient of the second optical surface of the 4th lens is k9,
The circular cone whose conic coefficient of the first optical surface of the 5th lens is k10,
The circular cone whose conic coefficient of the second optical surface of the 5th lens is k11,
The circular cone whose conic coefficient of the first optical surface of the 6th lens is k12,
The circular cone whose conic coefficient of the second optical surface of the 6th lens is k13,
Wherein, k1<- 1 is that hyperbola is aspherical, k6>0 is that flat ellipse is aspherical, k8>0 is that flat ellipse is aspherical, k13<- 1 is
Hyperbola is aspherical.
It is aspherical by adding, Lens can be effectively reduced, make lens construction compacter.Meanwhile, can effectively control
Off-axis aberration, improves the image quality of system
Further, the face type of all non-spherical lenses meets below equation：
Z=cy2/{1+[1-(1+k)c2y2]1/2}+a1y2+a2y4+a4y8+a5y10+a6y12+a7y14,
Wherein, curvature of the parameter c corresponding to the radius of non-spherical lens；
Y is the radial coordinate of non-spherical lens, and its unit is identical with length of lens unit；
K is the circular cone whose conic coefficient of non-spherical lens；
Work as k<When -1, the face type curve of corresponding non-spherical lens is hyperbola；
As k=-1, the face type curve of corresponding non-spherical lens is parabola；
When -1<k<When 0, the face type curve of corresponding non-spherical lens is ellipse；
As k=0, the face type of corresponding non-spherical lens is round；
Work as k>When 0, the face type of corresponding non-spherical lens is flat ellipse curve；
A1 to a7 represents the coefficient corresponding to the radial coordinate of each non-spherical lens respectively.
The aspherical geomery on two image optics surfaces of lens can be accurately set by above parameter.
Further, the effective aperture of the second optical surface of second lens is D2, the second optics table of the first lens
The radius of curvature in face is R2, it meets relational expression：
0.2<D2/2R2<0.6。
Most fish-eye first piece lens are avoided for hemispherical or the situation close to hemisphere, is greatly improved
The machinability of eyeglass.
Further, the angle of half field-of view of the optical system is ω, and it meets relational expression：2 ω=180 °.
Further, the effective focal length of the preceding group lens is fBefore, the effective focal length that lens are organized afterwards is fAfterwards, optical system has
Effect focal length is F, and it meets relational expression：
-3<fBefore/F<- 2.5,1<fAfterwards/F<1.5。
By organizing lens and rear group power of lens before reasonable distribution, in control system distortion simultaneously, it is also ensured that light
The requirement of system optic back focal more long.
Further, the Abbe number of the 3rd lens is v3, the Abbe number of the 4th lens is v4, it meets relational expression：
20<v3<30,55<v4<82。
By adjusting the 3rd lens and the 4th lens, the Abbe number of both is differed larger, be conducive to optical system
Chromatic aberration correction.
Further, described along light incident direction, the first lens are high to the chief ray incident of the optical surface of the 6th lens
Degree is followed successively by hi, the first lens to the effective focal length of the 6th lens are followed successively by fj, the effective focal length of optical system is F, wherein, i=
1、2、3、……、6；J=1,2,3 ..., 6；It meets relational expression：
-10<h1f1/F<-8.92；0.96<h2f2/F<1.2；-2.3<h3f3/F<-1.97；
0.01<h4f4/F<0.04；0.18<h5f5/F<0.25；-0.78<h6f6/F<-0.15。
By each power of lens of reasonable distribution, efficiently solve glass, modeling hybrid lens and go out in variation of ambient temperature
The problem of existing image blur, 0 DEG C -50 DEG C are expanded as by its temperature range.
In sum, the present invention uses 6 aspherics structures, wherein five plastic aspheric lenes, a sheet glass
Non-spherical lens, while fine aberration correction, realizes the miniaturization of optical system, and the overall length control of optical system is existed
Within 8mm；And the reasonable distribution for passing through focal power, on the premise of ensureing as matter, thermal drift is solved the problems, such as, realize optics
System without thermalized design, its temperature in use is expanded to 0 DEG C~50 DEG C, while reduces cost, improve market competition
Power.
Brief description of the drawings
Fig. 1 is the lens schematic diagram of one embodiment of the invention.
Fig. 2 is 20 DEG C of analysis diagrams of first embodiment.
Fig. 3 is 0 DEG C of analysis diagram of first embodiment.
Fig. 4 is 50 DEG C of analysis diagrams of first embodiment.
Fig. 5 is the curvature of field, the distortion figure of first embodiment.
Fig. 6 is the longitudinal aberration diagram of first embodiment.
Fig. 7 is the lateral chromatic aberration figure of first embodiment.
Fig. 8 is 20 DEG C of analysis diagrams of second embodiment.
Fig. 9 is 0 DEG C of analysis diagram of second embodiment.
Figure 10 is 50 DEG C of analysis diagrams of second embodiment.
Figure 11 is the curvature of field, the distortion figure of second embodiment.
Figure 12 is the longitudinal aberration diagram of second embodiment.
Figure 13 is the lateral aberration diagram of second embodiment.
Figure 14 is 20 DEG C of analysis diagrams of 3rd embodiment.
Figure 15 is 0 DEG C of analysis diagram of 3rd embodiment.
Figure 16 is 50 DEG C of analysis diagrams of 3rd embodiment.
Figure 17 is the curvature of field, the distortion figure of 3rd embodiment.
Figure 18 is the longitudinal aberration diagram of 3rd embodiment.
Figure 19 is the lateral aberration diagram of 3rd embodiment.
In figure：L1 is the first lens, and L2 is the second lens, and L3 is the 3rd lens, and L4 is the 4th lens, and L5 is the 5th saturating
Mirror, L6 is the 6th lens, and stop is diaphragm, and filter is colour filter.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
First embodiment
Referring to Fig. 1-Fig. 7, this aspherical fish eye lens is disposed with the first saturating of positive light coke along light incident direction
Mirror L1, the second lens L2 of negative power, the 3rd lens L3 of positive light coke, the 4th lens L4 of positive light coke, positive light coke
The 5th lens L5 and negative power the 6th lens L6, wherein, the first lens L1, the second lens L2, the 3rd lens L3 constitute
Preceding group of lens of negative power, the 4th lens L4, the 5th lens L5, the 6th lens L6 constitute rear group of lens of positive light coke, light
Door screen is located between preceding group of lens and rear group lens；Preceding group of lens, diaphragm, group lens, filter, image planes collectively form optical system afterwards
System, 8mm is less than from total length of the first optical surface of optical system to image planes, and the angle of visual field of optical system is more than 180 °.
The first lens L1 is Glass aspheric, the second lens L2, the 3rd lens L3, the 4th lens L4, the 5th lens
L5 and the 6th lens L6 is that plastic cement is aspherical；First optical surface and the second optical surface of the 3rd lens L3, the 5th lens L5
The first optical surface dorsad diaphragm；First optical surface and the second optical surface of the first lens L1, the second lens L2
First optical surface and the second optical surface, first optical surface of the 4th lens L4 and the second optical surface, the 5th lens L5
The second optical surface, first optical surface of the 6th lens L6 and the second optical surface bend towards diaphragm.
It is described along light incident direction, the circular cone whose conic coefficient of first optical surface of the first lens L1 is k1,
The circular cone whose conic coefficient of second optical surface of the first lens L1 is k2,
The circular cone whose conic coefficient of first optical surface of the second lens L2 is k3,
The circular cone whose conic coefficient of second optical surface of the second lens L2 is k4,
The circular cone whose conic coefficient of first optical surface of the 3rd lens L3 is k5,
The circular cone whose conic coefficient of second optical surface of the 3rd lens L3 is k6,
The circular cone whose conic coefficient of the optical surface of diaphragm is k7,
The circular cone whose conic coefficient of first optical surface of the 4th lens L4 is k8,
The circular cone whose conic coefficient of second optical surface of the 4th lens L4 is k9,
The circular cone whose conic coefficient of first optical surface of the 5th lens L5 is k10,
The circular cone whose conic coefficient of second optical surface of the 5th lens L5 is k11,
The circular cone whose conic coefficient of first optical surface of the 6th lens L6 is k12,
The circular cone whose conic coefficient of second optical surface of the 6th lens L6 is k13,
Wherein, k1<- 1 is that hyperbola is aspherical, k6>0 is that flat ellipse is aspherical, k8>0 is that flat ellipse is aspherical, k13<- 1 is
Hyperbola is aspherical.
Further, the face type of all non-spherical lenses meets below equation：
Z=cy2/{1+[1-(1+k)c2y2]1/2}+a1y2+a2y4+a4y8+a5y10+a6y12+a7y14,
Wherein, curvature of the parameter c corresponding to the radius of non-spherical lens；
Y is the radial coordinate of non-spherical lens, and its unit is identical with length of lens unit；
K is the circular cone whose conic coefficient of non-spherical lens；
Work as k<When -1, the face type curve of corresponding non-spherical lens is hyperbola；
As k=-1, the face type curve of corresponding non-spherical lens is parabola；
When -1<k<When 0, the face type curve of corresponding non-spherical lens is ellipse；
As k=0, the face type of corresponding non-spherical lens is round；
Work as k>When 0, the face type of corresponding non-spherical lens is flat ellipse curve；
A1 to a7 represents the coefficient corresponding to the radial coordinate of each non-spherical lens respectively.
The effective aperture of second optical surface of the second lens L2 is D2, second optical surface of the first lens L1
Radius of curvature is R2, it meets relational expression：
0.2<D2/2R2<0.6。
Further, the angle of half field-of view of the optical system is ω, and it meets relational expression：2 ω=180 °.
Further, the effective focal length of the preceding group lens is fBefore, the effective focal length that lens are organized afterwards is fAfterwards, optical system has
Effect focal length is F, and it meets relational expression：-3<fBefore/F<- 2.5,1<fAfterwards/F<1.5。
The Abbe number of the 3rd lens is v3, the Abbe number of the 4th lens is v4, it meets relational expression：20<v3<30,55
<v4<82。
It is described along light incident direction, the chief ray incident height of the optical surface of the first lens L6 of lens L1 to the 6th according to
Secondary is hi, the effective focal length of the first lens L6 of lens L1 to the 6th is followed successively by fj, the effective focal length of optical system is F, wherein, i=
1、2、3、……、6；J=1,2,3 ..., 6；It meets relational expression：
-10<h1f1/F<-8.92；0.96<h2f2/F<1.2；-2.3<h3f3/F<-1.97；
0.01<h4f4/F<0.04；0.18<h5f5/F<0.25；-0.78<h6f6/F<-0.15。
In the present embodiment, associated technical parameters are as shown in following table one.
Table one
| Number in face | R values | Thickness (mm) | Refractive index | Abbe number |
| OBJ | Infinity | 550.603 | ||
| S1 | 2.76 | 0.62 | 1.59 | 61.16 |
| S2 | 5.37 | 0.29 | ||
| S3 | 16.03 | 0.31 | 1.53 | 55.77 |
| S4 | 0.82 | 0.62 | ||
| S5 | -15.49 | 0.83 | 1.64 | 22.40 |
| S6 | -4.16 | 0.63 | ||
| S7(Stop) | Infinity | 0.03 | ||
| S8 | -55.15 | 0.35 | 1.53 | 55.77 |
| S9 | -1.68 | 0.11 | ||
| S10 | 3.32 | 0.63 | 1.53 | 55.77 |
| S11 | -1.19 | 0.08 | ||
| S12 | -1.24 | 0.89 | 1.64 | 22.40 |
| S13 | -15.59 | 0.43 | ||
| S14 | Infinity | 0.21 | 1.51 | 64.16 |
| S15 | Infinity | 1.31 | ||
| IMAGE | Infinity |
In table one above, S1 is first optical surface of the first lens L1, and S2 is the second optics table of the first lens L1
Face, S3 is first optical surface of the second lens L2, and S4 is second optical surface of the second lens L2, and S5 is the 3rd lens L3
First optical surface, S6 is second optical surface of the 3rd lens L3, and S7 is diaphragm, and S8 is the first optics table of the 4th lens L4
Face, S9 is second optical surface of the 4th lens L4, and S10 is first optical surface of the 5th lens L5, and S11 is the 5th lens L5
The second optical surface, S12 is first optical surface of the 6th lens L6, and S13 is second optical surface of the 6th lens L6,
S14 is the first optical surface of filter, and S15 is the second optical surface of filter.
From table one above by calculating, the physical parameter table one of following optical system can be obtained.
The physical parameter table one of optical system
| Number in face | K | |||||
| S1 | -3.06 | -3.20E-02 | 1.98E-03 | 5.16E-04 | -5.25E-05 | |
| S2 | -0.53 | -2.24E-02 | 3.17E-02 | -1.60E-02 | 2.72E-03 | |
| S3 | -50.04 | 1.57E-02 | -6.16E-04 | -2.12E-02 | 1.10E-02 | -1.64E-03 |
| S4 | -1.20 | -2.53E-02 | -5.06E-02 | -1.12E-02 | 2.23E-02 | 2.96E-02 |
| S5 | -2.73 | -7.85E-02 | 3.35E-02 | 1.24E-02 | 1.01E-02 | -1.78E-02 |
| S6 | 7.55 | 3.96E-02 | 8.94E-02 | -3.98E-02 | -1.25E-02 | 1.00E-02 |
| S8 | 10.04 | 3.40E-02 | -2.13E-01 | -3.51E-02 | -8.85E-01 | 3.18E-01 |
| S9 | -0.53 | 1.67E-01 | -4.89E-01 | -7.05E-01 | 2.92E+00 | -3.66E+00 |
| S10 | 8.491 | 1.99E-01 | -5.77E-01 | 8.37E-01 | -6.25E-01 | 2.47E-01 |
| S11 | -4.55 | -9.89E-02 | 1.08E-01 | -1.24E-01 | 8.92E-02 | 8.77E-02 |
| S12 | -3.35 | -9.74E-02 | 2.21E-02 | -1.35E-01 | 2.33E-01 | -1.58E-01 |
| S13 | -10.37 | 5.68E-02 | -3.92E-03 | -3.13E-03 | -1.11E-04 | -9.25E-04 |
Coefficient in the physical parameter table one of the optical system, is aspherical each coefficient.
The Specifications for finally obtaining are：Focal length：1.97mm, relative aperture：2.83, the angle of visual field：2 ω=180 °,
F- θ distort：- 83.79%, total length of light path：7.35mm, optics rear cut-off distance：1.88mm.
Second embodiment
Referring to Fig. 8-Figure 13, in the present embodiment, associated technical parameters are as shown in following table two.
Table two
| Number in face | R values | Thickness (mm) | Refractive index | Abbe number |
| OBJ | Infinity | 550.603 | ||
| S1 | 2.78 | 0.62 | 1.59 | 61.16 |
| S2 | 5.05 | 0.32 | ||
| S3 | 14.09 | 0.31 | 1.53 | 55.77 |
| S4 | 1.82 | 0.63 | ||
| S5 | -15.64 | 0.83 | 1.64 | 20.62 |
| S6 | -3.10 | 0.63 | ||
| S7(Stop) | Infinity | 0.02 | ||
| S8 | -39.54 | 0.35 | 1.54 | 81.01 |
| S9 | -1.66 | 0.10 | ||
| S10 | 3.32 | 0.63 | 1.53 | 55.77 |
| S11 | -1.03 | 0.09 | ||
| S12 | -1.25 | 0.89 | 1.64 | 22.40 |
| S13 | -5.94 | 0.43 | ||
| S14 | Infinity | 0.21 | 1.51 | 64.16 |
| S15 | Infinity | 1.3 | ||
| IMA | Infinity |
From table two above by calculating, the physical parameter table two of following optical system can be obtained.
The physical parameter table two of optical system
The Specifications for finally obtaining are：Focal length：1.96mm, relative aperture：2.83, the angle of visual field：2 ω=180 °,
F- θ distort：- 83.64%, total length of light path：7.3mm, optics rear cut-off distance：1.94mm.
First embodiment is seen in remaining not described part, repeats no more.
3rd embodiment
Referring to Figure 14-Figure 19, in the present embodiment, associated technical parameters are as shown in following table three.
Table three
| Number in face | R values | Thickness (mm) | Refractive index | Abbe number |
| OBJ | Infinity | 1101.206 | ||
| S1 | 11.52 | 1.24 | 1.59 | 61.16 |
| S2 | 10.74 | 0.59 | ||
| S3 | 32.06 | 0.62 | 1.53 | 55.77 |
| S4 | 1.64 | 1.24 | ||
| S5 | -30.98 | 1.66 | 1.64 | 22.40 |
| S6 | -8.32 | 1.26 | ||
| S7(Stop) | Infinity | 0.06 | ||
| S8 | -110.31 | 0.7 | 1.53 | 55.77 |
| S9 | -3.36 | 0.22 | ||
| S10 | 6.64 | 1.26 | 1.53 | 55.77 |
| S11 | -2.38 | 0.17 | ||
| S12 | -2.48 | 1.78 | 1.64 | 22.40 |
| S13 | -31.18 | 0.86 | ||
| S14 | Infinity | 0.42 | 1.51 | 64.16 |
| S15 | Infinity | 2.622158 | ||
| IMA | Infinity |
From table three above by calculating, the physical parameter table three of following optical system can be obtained.
The physical parameter table three of optical system
| Number in face | K | |||||
| S1 | -3.02073 | -4.12E-03 | 6.17E-05 | 3.96E-06 | -1.03E-07 | |
| S2 | -0.52987 | -2.80E-03 | 9.91E-04 | -1.25E-04 | 5.32E-06 | |
| S3 | -50.0413 | 1.97E-03 | -1.93E-05 | -1.66E-04 | 2.15E-05 | -8.01E-07 |
| S4 | -1.20409 | -3.16E-03 | -1.58E-03 | -8.75E-05 | 4.36E-05 | 1.44E-05 |
| S5 | -2.73604 | -9.82E-03 | 1.05E-03 | 9.65E-05 | 1.97E-05 | -8.67E-06 |
| S6 | 7.521017 | 4.96E-03 | 2.79E-03 | -3.11E-04 | -2.45E-05 | 4.90E-06 |
| S8 | 6.231445 | 4.25E-03 | -6.67E-03 | -2.74E-04 | -1.73E-03 | 1.55E-04 |
| S9 | -0.53095 | 2.09E-02 | -1.53E-02 | -5.51E-03 | 5.70E-03 | -1.79E-03 |
| S10 | 8.491048 | 2.49E-02 | -1.80E-02 | 6.54E-03 | -1.22E-03 | 1.21E-04 |
| S11 | -4.55435 | -1.24E-02 | 3.38E-03 | -9.72E-04 | 1.74E-04 | 4.28E-05 |
| S12 | -3.35728 | -1.22E-02 | 6.90E-04 | -1.05E-03 | 4.55E-04 | -7.70E-05 |
| S13 | -5.26102 | 7.10E-03 | -1.22E-04 | -2.44E-05 | -2.16E-07 | -4.52E-07 |
The Specifications for finally obtaining are：Focal length：3.94mm, relative aperture：2.83, the angle of visual field：2 ω=180 °,
F- θ distort：- 83.79%, total length of light path：14.70mm, optics rear cut-off distance：3.76mm.
First embodiment is seen in remaining not described part, repeats no more.
The various embodiments described above meet requirement：
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 (8)
1. a kind of aspherical fish eye lens, it is characterized in that being disposed with the first lens of positive light coke along light incident direction
(L1), second lens (L2) of negative power, the 3rd lens (L3) of positive light coke, the 4th lens (L4) of positive light coke, just
5th lens (L5) and the 6th lens (L6) of negative power of focal power, wherein, the first lens (L1), the second lens (L2),
3rd lens (L3) constitute preceding group of lens of negative power, and the 4th lens (L4), the 5th lens (L5), the 6th lens (L6) are constituted
Rear group of lens of positive light coke, diaphragm is located between preceding group of lens and rear group lens；Preceding group of lens, afterwards diaphragm, group lens, filter
Mirror, image planes collectively form optical system, and 8mm, optical system are less than from total length of the first optical surface of optical system to image planes
The angle of visual field of system is more than 180 °.
2. aspherical fish eye lens according to claim 1, it is characterized in that first lens (L1) are Glass aspheric,
Second lens (L2), the 3rd lens (L3), the 4th lens (L4), the 5th lens (L5) and the 6th lens (L6) are plastic cement aspheric
Face；
First optical surface and the second optical surface of the 3rd lens (L3), the first optical surface of the 5th lens (L5) are dorsad
Diaphragm；
First optical surface and the second optical surface of the first lens (L1), first optical surface and second of the second lens (L2)
Optical surface, the first optical surface of the 4th lens (L4) and the second optical surface, the second optical surface of the 5th lens (L5),
First optical surface and the second optical surface of the 6th lens (L6) bend towards diaphragm.
3. aspherical fish eye lens according to claim 1, it is characterized in that described along light incident direction, the first lens
(L1) the circular cone whose conic coefficient of the first optical surface is k1,
The circular cone whose conic coefficient of the second optical surface of the first lens (L1) is k2,
The circular cone whose conic coefficient of the first optical surface of the second lens (L2) is k3,
The circular cone whose conic coefficient of the second optical surface of the second lens (L2) is k4,
The circular cone whose conic coefficient of the first optical surface of the 3rd lens (L3) is k5,
The circular cone whose conic coefficient of the second optical surface of the 3rd lens (L3) is k6,
The circular cone whose conic coefficient of the optical surface of diaphragm is k7,
The circular cone whose conic coefficient of the first optical surface of the 4th lens (L4) is k8,
The circular cone whose conic coefficient of the second optical surface of the 4th lens (L4) is k9,
The circular cone whose conic coefficient of the first optical surface of the 5th lens (L5) is k10,
The circular cone whose conic coefficient of the second optical surface of the 5th lens (L5) is k11,
The circular cone whose conic coefficient of the first optical surface of the 6th lens (L6) is k12,
The circular cone whose conic coefficient of the second optical surface of the 6th lens (L6) is k13,
Wherein, k1＜ -1 is that hyperbola is aspherical, k6＞ 0 is that flat ellipse is aspherical, k8＞ 0 is that flat ellipse is aspherical, k13＜ -1 is
Hyperbola is aspherical.
4. aspherical fish eye lens according to claim 1, it is characterized in that the second optics table of second lens (L2)
The effective aperture in face is D2, the radius of curvature of the second optical surface of the first lens (L1) is R2, it meets relational expression：0.2<D2/
2R2<0.6。
5. aspherical fish eye lens according to claim 1, it is characterized in that the angle of half field-of view of the optical system is ω, its
Meet relational expression：2 ω=180 °.
6. aspherical fish eye lens according to claim 1, it is characterized in that the effective focal length of group lens is f before describedBefore, after
The effective focal length of group lens is fAfterwards, the effective focal length of optical system is F, and it meets relational expression：-3<fBefore/F<- 2.5,1<fAfterwards/F<
1.5。
7. aspherical fish eye lens according to claim 1, it is characterized in that the Abbe number of the 3rd lens (L3) is v3,
The Abbe number of the 4th lens is v4, it meets relational expression：
20<v3<30,55<v4<82。
8. aspherical fish eye lens according to claim 1, it is characterized in that described along light incident direction, the first lens
(L1) to the chief ray incident of the optical surface of the 6th lens (L6) is highly followed successively by hi, the first lens (L1) to the 6th lens
(L6) effective focal length is followed successively by fj, the effective focal length of optical system is F, wherein, i=1,2,3 ..., 6；J=1,2,
3、……、6；It meets relational expression：
-10<h1f1/F<-8.92；0.96<h2f2/F<1.2；-2.3<h3f3/F<-1.97；
0.01<h4f4/F<0.04；0.18<h5f5/F<0.25；-0.78<h6f6/F<-0.15。
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| CN201710216525.2A CN106908938B (en) | 2017-04-05 | 2017-04-05 | Aspherical fisheye lens |
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|---|---|---|---|
| CN201710216525.2A CN106908938B (en) | 2017-04-05 | 2017-04-05 | Aspherical fisheye lens |
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| CN108873227A (en) * | 2018-08-15 | 2018-11-23 | 福建福光股份有限公司 | The light-duty low-light camera lens in large aperture |
| CN109521551A (en) * | 2018-12-18 | 2019-03-26 | 福建福光天瞳光学有限公司 | The vehicle-mounted optical system of object lens of large relative aperture zero temp shift and imaging method |
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| CN109521551A (en) * | 2018-12-18 | 2019-03-26 | 福建福光天瞳光学有限公司 | The vehicle-mounted optical system of object lens of large relative aperture zero temp shift and imaging method |
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