CN107621689B - Miniaturized fish-eye optical system - Google Patents
Miniaturized fish-eye optical system Download PDFInfo
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- CN107621689B CN107621689B CN201711087732.9A CN201711087732A CN107621689B CN 107621689 B CN107621689 B CN 107621689B CN 201711087732 A CN201711087732 A CN 201711087732A CN 107621689 B CN107621689 B CN 107621689B
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Abstract
The embodiment of the invention discloses a miniaturized fisheye 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 negative; the object plane side of the second lens is a concave 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 convex 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 convex surface, 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, and has the advantages of fewer lenses, simple structure and small volume; different lenses are combined with each other, so that the optical performance of large field angle, high pixels, low distortion, small chromatic aberration and the like is realized.
Description
Technical field:
the invention relates to an optical system, in particular to a miniaturized fisheye optical system suitable for the fields of panoramic VR cameras and 360-degree dead-angle-free monitoring.
The background technology is as follows:
the existing fisheye optical system suitable for panoramic VR cameras and 360-degree dead-angle-free monitoring fields has the defects of multiple lenses and complex structure.
The invention comprises the following steps:
in order to solve the problems of a plurality of lenses and a complex structure of the existing fisheye optical system, the embodiment of the invention provides a miniaturized fisheye optical system.
The miniaturized fisheye optical system is provided with from an object plane to an image plane along an optical axis in sequence: 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 negative;
the object plane side of the second lens is a concave 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 convex 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 convex surface, 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, and has the advantages of fewer lenses, simple structure and small volume; different lenses are combined with each other, so that the optical performance of large field angle, high pixels, low distortion, small chromatic aberration and the like is realized.
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 miniaturized fisheye 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 negative;
the object plane side of the second lens 2 is a concave 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 convex 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 convex surface, and the focal power thereof 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, and has the advantages of fewer lenses, simple structure and small volume; different lenses are combined with each other, so that the optical performance of large field angle, high pixels, low distortion, small chromatic aberration and the like is realized.
Further, in the present embodiment, the fourth lens 4 and the fifth lens 5 are cemented with each other to form a combined lens, the optical power of which is positive. The structure is simple, and good optical performance can be ensured.
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: 0.1< f/f45<0.25, where f is the focal length of the entire optical system. Different lenses are combined with each other, so that good optical performance can be ensured.
Still further, as a specific embodiment of the present invention, not limiting, each lens of the optical system satisfies the following condition:
(1)-0.59<f/f1<-0.25；
(2)-0.66<f/f2<-0.42；
(3)0.46<f/f3<0.7；
(4)0.1<f/f45<0.25；
(5)0.12<f/f6<0.27；
wherein f is the focal length of the whole optical system, 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, and f6 is the focal length of the sixth lens 6. Different lenses are combined with each other, so that the optical performance of large field angle, high pixels, low distortion, small chromatic aberration and the like is realized.
Still further, in the present embodiment, the focal length f1, the material refractive index Nd1, and the material abbe constant Vd1 of the first lens 1 satisfy: -0.59< f/f1< -0.25, nd1 > 1.80, vd 1< 50, wherein f is the focal length of the whole optical system. The structure is simple, and good optical performance can be ensured.
Still further, the second lens 2 is made of light crown glass, and the focal length f2, the refractive index Nd2 of the material, and the abbe constant Vd2 of the second lens satisfy: -0.66< f/f2< -0.42, nd2 < 1.50, vd2 > 70, where f is the focal length of the whole optical system. The structure is simple, and good optical performance can be ensured.
Further, the third lens 3 is made of heavy lanthanum flint glass, and the focal length f3, the refractive index Nd3 of the material and the abbe constant Vd3 of the third lens satisfy the following conditions: 0.46< f/f3<0.7, nd3 > 1.90, vd 3< 36, where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Specifically, the combined focal length f45 of the fourth lens 4 and the fifth lens 5 satisfies: 0.1< f/f45<0.25, and the material refractive index Nd4 and the material Abbe constant Vd4 of the fourth lens satisfy the following conditions: nd4 is less than 1.70, and Vd4 is more than 55; the refractive index Nd5 of the material and the abbe constant Vd5 of the fifth lens satisfy: nd5 is more than 1.90, vd5 is less than 22; where f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Further, the sixth lens 6 is made of heavy lanthanum flint glass, and the focal length f6, the refractive index Nd6 of the material and the abbe constant Vd6 of the material satisfy the following conditions: 0.12< f/f6<0.27, nd6 > 1.87, vd 6< 40, 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 third lens side. The structure is simple, and the device is used for adjusting the intensity of the light beam.
Further, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are all glass lenses.
Specifically, in the present embodiment, the focal length f of the present optical system is 1.08mm, the diaphragm index fno is 2.0, the angle of view 2ω=200°, and the optical total length TTL is 10mm. The basic parameters of the optical system are shown in the following table:
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.
As can be seen from fig. 2 to 4, the optical system in the present embodiment has good optical performance of high pixels, low distortion, small chromatic aberration, 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. A miniaturized fisheye optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged 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 negative;
the object plane side of the second lens is a concave 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 convex 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 convex surface, 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, and the focal power of the combined lens is positive;
each lens of the optical system satisfies the following condition:
（1）-0.59<f/f1<-0.25；
（2）-0.66<f/f2<-0.42；
（3）0.46<f/f3<0.7；
（4）0.1<f/f45<0.25；
（5）0.12<f/f6<0.27；
wherein f is the focal length of the whole optical system, 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, and f6 is the focal length of the sixth lens;
the angle of view 2ω=200°, the total optical length TTL being 10mm.
2. The miniaturized fisheye optical system of claim 1 wherein the material refractive index Nd1, the material abbe constant Vd1 satisfy: nd1 is more than 1.80, and Vd1 is less than 50.
3. The miniaturized fisheye optical system of claim 1 wherein the material refractive index Nd2, the material abbe constant Vd2 satisfy: nd2 is less than 1.50, and Vd2 is more than 70.
4. The miniaturized fisheye optical system of claim 1 wherein the material refractive index Nd3, the material abbe constant Vd3 satisfy: nd3 is more than 1.90, and Vd3 is less than 36.
5. The miniaturized fisheye optical system of claim 1 wherein the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens satisfy: nd4 is less than 1.70, and Vd4 is more than 55; the refractive index Nd5 of the material and the abbe constant Vd5 of the fifth lens satisfy: nd5 is more than 1.90, and Vd5 is less than 22.
6. The miniaturized fisheye optical system of claim 1 wherein the material refractive index Nd6, the material abbe constant Vd6 satisfy: nd6 is more than 1.87, and Vd6 is less than 40.
7. The miniaturized fisheye optical system of claim 1 wherein the stop STO of the optical system is located between the third lens and the fourth lens, near the third lens side.
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| CN201711087732.9A CN107621689B (en) | 2017-11-08 | 2017-11-08 | Miniaturized fish-eye optical system |
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| CN201711087732.9A CN107621689B (en) | 2017-11-08 | 2017-11-08 | Miniaturized fish-eye optical system |
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| CN107621689B true CN107621689B (en) | 2023-04-28 |
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| CN108490590B (en) * | 2018-05-02 | 2023-07-28 | 广东弘景光电科技股份有限公司 | Day and night confocal fish eye monitoring optical system and camera module applying same |
| US20230168471A1 (en) * | 2020-04-30 | 2023-06-01 | Tianjin Ofilm Opto Electronics Co., Ltd | Optical system, camera module, electronic device, and automobile |
| CN215895101U (en) * | 2021-06-10 | 2022-02-22 | 浙江棱镜全息科技有限公司 | Aerial imaging device based on image stitching |
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| CN206039007U (en) * | 2016-07-25 | 2017-03-22 | 南阳市海科光电有限责任公司 | Big light ring super wide angle fisheye lens optical system |
| CN106842520A (en) * | 2017-03-30 | 2017-06-13 | 中山联合光电科技股份有限公司 | A high-definition panoramic surround-view optical imaging system |
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| CN204389773U (en) * | 2012-07-23 | 2015-06-10 | 富士胶片株式会社 | Imaging lens system and camera head |
| KR102016724B1 (en) * | 2014-11-28 | 2019-09-02 | 삼성전기주식회사 | Optical system |
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| CN206039007U (en) * | 2016-07-25 | 2017-03-22 | 南阳市海科光电有限责任公司 | Big light ring super wide angle fisheye lens optical system |
| CN106842520A (en) * | 2017-03-30 | 2017-06-13 | 中山联合光电科技股份有限公司 | A high-definition panoramic surround-view optical imaging system |
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