CN107608058B - Low distortion wide angle optical system - Google Patents
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- CN107608058B CN107608058B CN201711087709.XA CN201711087709A CN107608058B CN 107608058 B CN107608058 B CN 107608058B CN 201711087709 A CN201711087709 A CN 201711087709A CN 107608058 B CN107608058 B CN 107608058B
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Abstract
The embodiment of the invention discloses a low-distortion wide-angle optical system, which sequentially comprises the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive; the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative; the object plane side of the third lens is a convex surface, the image plane side is a concave surface, and the focal power of the third lens is positive; the object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive; the object plane side of the fifth lens is a concave surface, the image plane side is a plane, and the focal power of the fifth lens is negative; the object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power is positive. The embodiment of the invention mainly comprises six lenses, has fewer lenses, simple structure and overall miniaturization; different lenses are combined with each other, so that the lens has good optical properties of wide angle, high pixels, low distortion and the like, and is suitable for the fields of aerial photography monitoring and the like.
Description
Technical field:
the invention relates to an optical system, in particular to a low-distortion wide-angle optical system applied to the fields of aerial photographing monitoring such as unmanned aerial vehicles, aerial photographing devices and the like.
The background technology is as follows:
the existing optical system suitable for the field of aerial photography monitoring has the defects of multiple lenses and complex structure.
The invention comprises the following steps:
in order to solve the problems of excessive lenses and complex structure of the existing optical system, the embodiment of the invention provides a low-distortion wide-angle optical system.
The low distortion wide angle optical system is equipped with along the optical axis from object plane to image plane in proper order: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens;
the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive;
the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a convex surface, the image plane side is a concave surface, and the focal power of the third lens is positive;
the object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive;
the object plane side of the fifth lens is a concave surface, the image plane side is a plane, and the focal power of the fifth lens is negative;
the object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power is positive.
The embodiment of the invention mainly comprises six lenses, has fewer lenses, simple structure and overall miniaturization; different lenses are combined with each other, so that the lens has good optical properties of wide angle, high pixels, low distortion and the like, and is suitable for the fields of aerial photographing monitoring such as unmanned aerial vehicles, aerial photographing devices and the like.
Description of the drawings:
in order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an optical system according to the present invention;
FIG. 2 is a graph of field curvature and distortion of an optical system of the present invention;
FIG. 3 is a color difference plot of the optical system of the present invention;
fig. 4 is an MTF graph of an optical system of the present invention.
The specific embodiment is as follows:
in order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the low-distortion wide-angle optical system is provided with, in order from an object plane to an image plane along an optical axis: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6.
The object plane side of the first lens 1 is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive;
the object plane side of the second lens 2 is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens 3 is a convex surface, the image plane side is a concave surface, and the focal power of the third lens is positive;
the object plane side of the fourth lens 4 is a convex surface, the image plane side is a convex surface, and the focal power is positive;
the object plane side of the fifth lens 5 is a concave surface, the image plane side is a plane, and the focal power of the fifth lens is negative;
the sixth lens element 6 has a convex object-side surface, a convex image-side surface, and a positive optical power.
The embodiment of the invention mainly comprises six lenses, has fewer lenses, simple structure and overall miniaturization; different lenses are combined with each other, so that the lens has good optical properties of wide angle, high pixels, low distortion and the like, and is suitable for the fields of aerial photographing monitoring such as unmanned aerial vehicles, aerial photographing devices and the like.
Further, in the present embodiment, the fourth lens 4 and the fifth lens 5 are cemented with each other to form a combined lens whose combined optical power is positive.
Still further, as a preferable mode of the present embodiment, the combined focal length f45 of the fourth lens 4 and the fifth lens 5 satisfies: 0.35< f/f45<0.63, where f is the focal length of the entire optical system. Simple structure, miniaturization, and good optical performance.
Further, as a specific embodiment of the present embodiment, not limiting, each lens of the optical system satisfies the following condition:
(1)0<f/f1<0.1；
(2)-0.98<f/f2<-0.50；
(3)0.1<f/f3<0.25；
(4)0.35<f/f45<0.63；
(5)0.37<f/f6<0.60；
wherein f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f45 is the combined focal length of the fourth lens 4 and the fifth lens 5, f6 is the focal length of the sixth lens 6, and f is the focal length of the entire optical system. Different lenses are combined with each other, so that the lens has good optical properties of wide angle, high pixels, low distortion and the like.
Still further, as specific embodiments of the present embodiment, without limitation, the focal length f1, the material refractive index Nd1, and the material abbe constant Vd1 of the first lens 1 satisfy: 0<f/f1<0.1, nd1 > 1.80, vd 1< 50, where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment of the present disclosure, but not limited to, the second lens 2 is a plastic aspheric lens, and the focal length f2, the material refractive index Nd2, and the material abbe constant Vd2 thereof satisfy: -0.98< f/f2< -0.50, nd2 < 1.56, vd2 > 55, where f is the focal length of the whole optical system. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment of the present invention, but not limited to, the third lens 3 is a plastic aspherical lens, and the focal length f3, the material refractive index Nd3, and the material abbe constant Vd3 thereof satisfy: 0.1< f/f3<0.25, nd3 > 1.61, vd 3< 26, where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Specifically, as a specific embodiment of the present embodiment, not limiting, the combined focal length f45 of the fourth lens 4 and the fifth lens 5 satisfies: 0.35< f/f45<0.63, and the material refractive index Nd4 and the material Abbe constant Vd4 of the fourth lens 4 satisfy: nd4 is less than 1.78, and Vd4 is more than 49; the material refractive index Nd5 and the material abbe constant Vd5 of the fifth lens 5 satisfy: nd5 is more than 1.84, vd5 is less than 24; where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment of the present invention, but not limited to, the sixth lens 6 is a plastic aspherical lens, and the focal length f6, the material refractive index Nd6, and the material abbe constant Vd6 thereof satisfy: 0.37< f/f6<0.60, nd 6< 1.56, vd6 > 55, where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Still further, the stop STO of the optical system is located between the third lens 3 and the fourth lens 4, near the fourth lens side. The structure is simple, and the device is used for adjusting the intensity of the light beam.
Specifically, in the present embodiment, the focal length f of the present optical system is 3.10mm, the diaphragm index fno. is 2.6, the horizontal angle of view 2ω=92.5°, the matching 1/2.3"sensor, and the optical total length TTL is 16.9mm. The basic parameters of the optical system are shown in the following table:
| surface of the body | Radius of curvature R (mm) | Thickness D (mm) | Refractive index Nd | Dispersion value Vd |
| S1 | 12.891 | 1.36 | 1.804 | 46.57 |
| S2 | 17.365 | 0.74 | ||
| S3 | 6.153 | 0.595 | 1.535 | 55.78 |
| S4 | 1.387 | 3.24 | ||
| S5 | 4.341 | 1.521 | 1.614 | 25.57 |
| S6 | 6.449 | 0.425 | ||
| STO | Infinity (infinity) | 0.056 | ||
| S8 | 4.350 | 2.55 | 1.773 | 49.61 |
| S9 | -2.994 | 0.48 | 1.847 | 23.79 |
| S10 | Infinity (infinity) | 0.35 | ||
| S11 | 12.146 | 0.91 | 1.535 | 55.78 |
| S12 | -5.132 | 0.5 | ||
| S13 | Infinity (infinity) | 0.80 | 1.51680 | 64.20 |
In the table, S1 and S2 are two surfaces of the first lens 1 along the optical axis from the object plane to the image plane; s3 and S4 correspond to two surfaces of the second lens 2; s5 and S6 correspond to two surfaces of the third lens 3; STO corresponds to the position of the aperture stop 7 of the optical system; s8 and S9 correspond to two surfaces of the fourth lens 4; s9 and S10 correspond to two surfaces of the fifth lens 5; s11 and S12 correspond to two surfaces of the sixth lens 6; s13 corresponds to the Sensor imaging surface 8.
More specifically, the surfaces of the second lens 2, the third lens 3, and the sixth lens 6 are aspherical shapes, which satisfy the following equations:
wherein, the parameter c=1/R is the curvature corresponding to the radius, y is the radial coordinate, the unit is the same as the lens length unit, k is the conic coefficient, a 1 To a 8 The coefficients corresponding to the radial coordinates are respectively obtained. The aspherical correlation values of the S3 and S4 surfaces of the second lens 2, the S5 and S6 surfaces of the third lens 3, and the S11 and S12 surfaces of the sixth lens 6 are shown in the following table:
| K | α 1 | α 2 | α 3 | α 4 | α 5 | α 6 | α 7 | |
| S3 | 0.2368 | 0 | -0.004197 | 2.589E-06 | 1.953E-06 | 1.065E-07 | -6.296E-09 | |
| S4 | -0.7806 | 0 | 0.014289 | -5.590E-03 | 4.232E-03 | -1.312E-03 | 1.657E-04 | -6.169E-06 |
| S5 | 1.8017 | 0 | 0.003466 | 2.026E-04 | 9.699E-05 | -7.946E-04 | 8.788E-04 | -3.823E-04 |
| S6 | -6.9483 | 0 | 0.007847 | 7.675E-04 | 6.104E-03 | -1.258E-02 | 1.052E-02 | -4.293E-03 |
| S11 | -203.64 | 0 | 0.005958 | -2.214E-03 | -3.729E-05 | 1.928E-04 | -5.585E-05 | 5.154E-06 |
| S12 | 1.6305 | 0 | 0.007486 | 4.143E-04 | 2.655E-04 | -2.497E-04 | 8.760E-05 | -1.461E-05 |
as can be seen from fig. 2 to fig. 4, the optical system in the embodiment has good optical performance such as wide angle, high pixel, low distortion, and is suitable for the fields of aerial monitoring such as unmanned aerial vehicle, aerial camera, and the like.
The foregoing description of one or more embodiments provided in connection with the specific disclosure is not intended to limit the practice of the invention to such description. The method, structure, etc. similar to or identical to those of the present invention, or some technical deductions or substitutions are made on the premise of the inventive concept, should be regarded as the protection scope of the present invention.
Claims (7)
1. The low-distortion wide-angle optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from an object plane to an image plane along an optical axis; it is characterized in that the method comprises the steps of,
the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is positive;
the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a convex surface, the image plane side is a concave surface, and the focal power of the third lens is positive;
the object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive;
the object plane side of the fifth lens is a concave surface, the image plane side is a plane, and the focal power of the fifth lens is negative;
the object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power of the sixth lens is positive;
the fourth lens and the fifth lens are mutually glued to form a combined lens, the combined focal power of which is positive,
each lens of the optical system satisfies the following condition:
（1）0＜f/f1＜0.1；
（2）-0.98＜f/f2＜-0.50；
（3）0.1＜f/f3＜0.25；
（4）0.35＜f/f45＜0.63；
（5）0.37＜f/f6＜0.60；
wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f45 is the combined focal length of the fourth lens and the fifth lens, f6 is the focal length of the sixth lens, f is the focal length of the whole optical system, the diaphragm index fno=2.6, and the total optical length ttl=16.9 mm.
2. The low-distortion wide-angle optical system according to claim 1, wherein the material refractive index Nd1, the material abbe constant Vd1 of the first lens satisfy: nd1 is more than 1.80, and Vd1 is less than 50.
3. The low-distortion wide-angle optical system according to claim 1, wherein the second lens is a plastic aspherical lens having a material refractive index Nd2 and a material abbe constant Vd2 satisfying: nd2 is less than 1.56, and Vd2 is more than 55.
4. The low-distortion wide-angle optical system according to claim 1, wherein the third lens is a plastic aspherical lens having a material refractive index Nd3 and a material abbe constant Vd3 satisfying: nd3 is more than 1.61, and Vd3 is less than 26.
5. The low-distortion wide-angle optical system according to claim 1, wherein the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens satisfy: nd4 is less than 1.78, and Vd4 is more than 49; the refractive index Nd5 of the material and the abbe constant Vd5 of the fifth lens satisfy: nd5 is more than 1.84, and Vd5 is less than 24.
6. The low-distortion wide-angle optical system according to claim 1, wherein the sixth lens is a plastic aspherical lens having a material refractive index Nd6 and a material abbe constant Vd6 satisfying: nd6 is less than 1.56, and Vd6 is more than 55.
7. The low-distortion wide-angle optical system according to claim 1, wherein the stop STO of the optical system is located between the third lens and the fourth lens, near the fourth lens side.
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| CN108627955A (en) * | 2018-05-15 | 2018-10-09 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114265185B (en) * | 2021-12-23 | 2023-05-16 | 上海峰梅光学科技有限公司 | Optical lens and imaging device |
| CN114609755B (en) * | 2022-03-17 | 2024-04-12 | 福建福光天瞳光学有限公司 | Optical system of large-view-field high-imaging-stability camera and working method thereof |
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|---|---|---|---|---|
| JP2005227569A (en) * | 2004-02-13 | 2005-08-25 | Nagano Kogaku Kenkyusho:Kk | Two-group zoom lens |
| CN101153954A (en) * | 2006-09-29 | 2008-04-02 | 佳能株式会社 | Zoom lens and image pickup apparatus including the same |
| CN101201449A (en) * | 2006-12-13 | 2008-06-18 | 索尼株式会社 | Zoom lens and imaging apparatus |
| WO2016176911A1 (en) * | 2015-05-04 | 2016-11-10 | 嘉兴中润光学科技有限公司 | Small-size wide-angle camera lens |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005227569A (en) * | 2004-02-13 | 2005-08-25 | Nagano Kogaku Kenkyusho:Kk | Two-group zoom lens |
| CN101153954A (en) * | 2006-09-29 | 2008-04-02 | 佳能株式会社 | Zoom lens and image pickup apparatus including the same |
| CN101201449A (en) * | 2006-12-13 | 2008-06-18 | 索尼株式会社 | Zoom lens and imaging apparatus |
| WO2016176911A1 (en) * | 2015-05-04 | 2016-11-10 | 嘉兴中润光学科技有限公司 | Small-size wide-angle camera lens |
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