CN108319004B - High-pixel ultra-wide angle optical system and camera module applying same - Google Patents
High-pixel ultra-wide angle optical system and camera module applying same Download PDFInfo
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- CN108319004B CN108319004B CN201810255730.4A CN201810255730A CN108319004B CN 108319004 B CN108319004 B CN 108319004B CN 201810255730 A CN201810255730 A CN 201810255730A CN 108319004 B CN108319004 B CN 108319004B
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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
- G02B13/001—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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Abstract
The embodiment of the invention discloses a high-pixel ultra-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, a sixth lens, a seventh lens, and an eighth 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 convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative; the third lens is a biconvex lens, and the focal power of the third lens is positive; the object plane side of the fourth lens is a concave surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive; the fifth lens is a biconvex lens, and the focal power of the fifth lens is positive; the sixth lens is a biconvex lens, and the focal power of the sixth lens is positive; the object plane side of the seventh lens is a concave surface, the image plane side is a convex surface, and the focal power of the seventh lens is negative; the eighth lens is a biconvex lens, and its optical power is positive. On the other hand, the embodiment of the invention also provides a camera module. The embodiment of the invention has the advantages of large aperture, large visual angle, high pixel, very good heat eliminating difference and other good performances.
Description
Technical field:
the invention relates to an optical system and an imaging module applied to the optical system, in particular to a high-pixel ultra-wide-angle optical system and an imaging module applied to the optical system.
The background technology is as follows:
with the development of science and technology, the ultra-wide angle lens is also widely applied. In the aspect of automobile electronic application, the ultra-wide angle lens can observe a wider space range due to an ultra-large visual angle, and is beneficial to applications such as auxiliary driving, panoramic parking and the like. The existing ultra-wide angle lens generally has the problems of complex structure, low pixel and high cost.
The invention comprises the following steps:
in order to solve the problem that the existing ultra-wide angle lens is generally complex in structure, the embodiment of the invention provides a high-pixel ultra-wide angle optical system.
A high-pixel ultra-wide angle optical system sequentially comprises 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, a sixth lens, a seventh lens, and an eighth 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 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 convex surface, and the focal power of the third lens is positive;
the object plane side of the fourth lens is a concave 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 convex surface, the image plane side is a convex surface, and the focal power of the fifth lens is positive;
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 object plane side of the seventh lens is a concave surface, the image plane side is a convex surface, and the focal power of the seventh lens is negative;
the object plane side of the eighth lens is a convex surface, the image plane side is a convex surface, and the focal power of the eighth lens is positive.
On the other hand, the embodiment of the invention also provides a camera module.
The camera module at least comprises an optical lens, wherein the high-pixel ultra-wide angle optical system is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 8 lenses, and have simple structure; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has the good performances of large aperture, large visual angle, high pixel, very good athermalization 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 or lens according to the present invention;
FIG. 2 is a graph of distortion at +25℃;
FIG. 3 is a graph of MTF at +25℃;
FIG. 4 is a graph of the relative illuminance at +25℃;
FIG. 5 is a graph of MTF at-40 ℃ for an optical system or lens of the present invention;
fig. 6 is a graph of MTF at +85 ℃ for an optical system or lens 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.
When embodiments of the present invention refer to the ordinal terms "first," "second," etc., it is to be understood that they are merely used for distinguishing between them unless the order of their presentation is indeed dependent on the context.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present invention provides a high-pixel ultra-wide angle optical system, which sequentially includes, from an object plane to an image plane 10 along an optical axis: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and an eighth lens 8.
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 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 convex surface, and the focal power of the third lens is positive;
the object plane side of the fourth lens 4 is a concave 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 5 is a convex surface, the image plane side is a convex surface, and the focal power of the fifth lens is positive;
the object plane side of the sixth lens element 6 is a convex surface, the image plane side is a convex surface, and the focal power thereof is positive;
the object plane side of the seventh lens 7 is a concave surface, the image plane side is a convex surface, and the focal power of the seventh lens is negative;
the eighth lens element 8 has a convex object-side surface, a convex image-side surface, and a positive optical power.
The optical system of the embodiment of the invention mainly consists of 8 lenses, and has simple structure; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has the good performances of large aperture, large visual angle, high pixel, very good athermalization and the like.
Further, as a specific embodiment, but not limited to, the sixth lens 6 and the seventh lens 7 are cemented to each other to form a combined lens, and TTL/EFL is less than or equal to 13.65, wherein TTL is a distance between an object plane side vertex of the first lens 1 of the optical system and the imaging plane 10, and EFL is an effective focal length of the optical system. Simple structure, and has the good performances of large aperture, large visual angle, high pixel, very good heat eliminating difference and the like.
Still further, as a specific embodiment, not limiting, the focal length f67 of the sixth lens 6 and the seventh lens 7 forming a combined lens satisfies the following condition: 30< f67<200. The structure is simple, and good optical performance can be ensured.
Still further, illustratively, in the present embodiment, each lens of the optical system satisfies the following condition:
(1)-15<f1<-5；
(2)-5<f2<-2；
(3)5<f3<10；
(4)30<f4<100；
(5)3<f5<15；
(6)2<f6<8；
(7)-10<f7<-2；
(8)2<f8<15；
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, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, f6 is the focal length of the sixth lens 6, f7 is the focal length of the seventh lens 7, and f8 is the focal length of the eighth lens 8. Simple structure, and has the good performances of large aperture, large visual angle, high pixel, very good heat eliminating difference and the like.
Still further, as a preferred embodiment, not limiting, each lens of the optical system satisfies the following condition:
(1)-12<f1/f<-2；
(2)-5<f2/f<-1.5；
(3)2<f3/f<10；
(4)20<f4/f<100；
(5)2<f5/f<10；
(6)1.5<f6/f<5；
(7)-5<f7/f<-1.5；
(8)2<f8/f<10；
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, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, f6 is the focal length of the sixth lens 6, f7 is the focal length of the seventh lens 7, and f8 is the focal length of the eighth lens 8. Simple structure, and has the good performances of large aperture, large visual angle, high pixel, very good heat eliminating difference and the like.
Still further, as a specific embodiment, but not limited to, the material refractive index Nd1, the material abbe constant Vd1 of the first lens 1 satisfy: 1.72< Nd1<1.95, 40< Vd1<60. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment, but not limited to, the refractive index Nd2 of the material of the second lens 2, the abbe constant Vd2 of the material satisfy: 1.45< Nd2<1.65, 40< Vd2<60. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment, but not limited to, the refractive index Nd3 of the material and the abbe constant Vd3 of the third lens 3 satisfy: 1.55< Nd3<1.75, 15< Vd3<35. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment, but not limited to, the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens 4 satisfy: 1.75< Nd4<1.95, 15< Vd4<50. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment, but not limited to, the refractive index Nd5 of the material and the abbe constant Vd5 of the fifth lens 5 satisfy: 1.45< Nd5<1.65, 50< Vd5<85. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment, but not limited to, the refractive index Nd6 of the material of the sixth lens 6, the abbe constant Vd6 of the material satisfy: 1.55< Nd6<1.75, 40< Vd6<70. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment, but not limited to, the refractive index Nd7 of the material of the seventh lens 7, the abbe constant Vd7 of the material satisfy: 1.75< Nd7<2.05, 15< Vd7<40. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment, but not limited to, the refractive index Nd8 of the material of the eighth lens 8, the abbe constant Vd8 of the material satisfy: 1.45< Nd8<1.65, 40< Vd8<60. The structure is simple, and good optical performance can be ensured.
Further, in the present embodiment, the stop 9 of the optical system is located between the fourth lens 4 and the fifth lens 5. The structure is simple, and the device is used for adjusting the intensity of the light beam. Preferably, the diaphragm 9 is arranged on the image side of the fourth lens 4, and in this embodiment, the positions of the respective lenses and the diaphragm are fixed.
Still further, as a preferred embodiment, a bandpass filter is provided between the eighth lens 8 and the image plane 10. The infrared light in the environment can be filtered to avoid the red exposure phenomenon of the image.
Further, as a preferred embodiment, the second lens 2, the third lens 3, and the eighth lens 8 are all aspherical lenses. The method can effectively eliminate the influence of spherical aberration on the performance of the lens, improve the resolving power of the optical lens, effectively realize the heat elimination difference and reduce the processing difficulty and the production cost of the lens.
Specifically, in the present embodiment, the focal length F of the present optical system is 1.32mm, the stop index F No. is 2.0, the angle of view 2ω=200°, the focal length f1= -9.12mm of the first lens L1, the focal length f2= -3.01mm of the second lens L2, the focal length f3=6.63 mm of the third lens L3, the focal length f4= 62.97mm of the fourth lens L4, the focal length f5=5.88 mm of the fifth lens L5, the focal length f6=3.32 mm of the sixth lens L6, the focal length f7= -3.29mm of the seventh lens L7, and the focal length f8=6.10 mm of the eighth lens L8. 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; s7 and S8 correspond to two surfaces of the fourth lens 4; s9 is a diaphragm STO; s10 and S11 correspond to two surfaces of the fifth lens 5; s12 and S13 correspond to two surfaces of the sixth lens 6; s13 and S14 correspond to two surfaces of the seventh lens 7; s15 and S16 correspond to two surfaces of the eighth lens 8; s17 and S18 are correspondingly two surfaces of the band-pass filter; IMA is the image plane 10.
More specifically, the surfaces of the second lens 2, the third lens 3, and the eighth lens 8 are aspherical shapes, which satisfy the following equations:+a 5 y 10 the method comprises the steps of carrying out a first treatment on the surface of the 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 5 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 S15 and S16 surfaces of the eighth lens 8 are shown in the following table:
as can be seen from fig. 2 to 6, the optical system in the present embodiment has high resolution and very good athermal performance.
The camera module at least comprises an optical lens, wherein the high-pixel ultra-wide angle optical system is arranged in the optical lens.
The camera module of the embodiment of the invention mainly comprises 8 lenses, and has simple structure; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has the good performances of large aperture, large visual angle, high pixel, very good athermalization 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 (6)
1. The high-pixel ultra-wide angle optical system consists of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth 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 curvature radius is 14.00mm, the image plane side is a concave surface, the curvature radius is 4.60mm, the focal power is negative, the refractive index Nd1 of the material is 1.8, the thickness of the first lens is 1.5mm, and the distance from the first lens to the second lens is 2.8mm;
the object plane side of the second lens is a convex surface, the curvature radius is 6.00mm, the image plane side is a concave surface, the curvature radius is 1.20mm, the focal power is negative, the refractive index Nd2 of the material is 1.5, the thickness of the second lens is 1.0mm, and the distance from the second lens to the third lens is 2.0mm;
the object plane side of the third lens is a convex surface, the curvature radius is 6.00mm, the image plane side is a convex surface, the curvature radius is-13.80 mm, the focal power is positive, the refractive index Nd3 of the material is 1.6, the thickness of the third lens is 1.2mm, and the distance from the third lens to the fourth lens is 0.3mm;
the object plane side of the fourth lens is concave, the curvature radius is-3.70 mm, the image plane side is convex, the curvature radius is-4.00 mm, the focal power is positive, the refractive index Nd4 of the material is 1.8, the thickness of the fourth lens is 1.2mm, and the distance from the fourth lens to the diaphragm is 0.2mm;
the object plane side of the fifth lens is a convex surface, the curvature radius is 4.00mm, the image plane side is a convex surface, the curvature radius is-9.00 mm, the focal power is positive, the refractive index Nd5 of the material is 1.5, the distance from the diaphragm to the fifth lens is 0.0mm, the thickness of the fifth lens is 1.5mm, and the distance from the fifth lens to the sixth lens is 0.1mm;
the object plane side of the sixth lens is a convex surface, the curvature radius is 10.00mm, the image plane side is a convex surface, the curvature radius is-2.40 mm, the focal power is positive, the refractive index Nd6 of the material is 1.6, the thickness of the sixth lens is 2.0mm, and the distance from the sixth lens to the seventh lens is 0.0mm;
the object plane side of the seventh lens is concave, the curvature radius is-2.40 mm, the image plane side is convex, the curvature radius is 11.00mm, the focal power is negative, the refractive index Nd7 of the material is 1.8, the thickness of the seventh lens is 0.5mm, and the distance from the seventh lens to the eighth lens is 0.5mm;
the object plane side of the eighth lens is a convex surface, the curvature radius is 5.50mm, the image plane side is a convex surface, the curvature radius is-7.50 mm, the focal power is positive, the refractive index Nd8 of the material is 1.5, and the thickness of the eighth lens is 1.2mm.
2. The high-pixel ultra-wide angle optical system according to claim 1, wherein the abbe constant Vd1 of the material of the first lens satisfies: 40< Vd1<60.
3. The high-pixel ultra-wide angle optical system according to claim 1, wherein the abbe constant Vd2 of the material of the second lens satisfies: 40< Vd2<60.
4. The high-pixel ultra-wide angle optical system according to claim 1, wherein the abbe constant Vd3 of the material of the third lens satisfies: 15< Vd3<35.
5. The high-pixel ultra-wide angle optical system according to claim 1, wherein the fourth lens has a material abbe constant Vd4 that satisfies: 15< Vd4<50.
6. An image pickup module at least comprising an optical lens, wherein the high-pixel ultra-wide angle optical system as set forth in any one of claims 1 to 5 is installed in the optical lens.
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| CN110596860B (en) * | 2019-08-20 | 2021-06-25 | 江西联创电子有限公司 | High-pixel wide-angle lens and imaging device |
| US11829005B2 (en) | 2019-08-20 | 2023-11-28 | Jiangxi Lianchuang Electronic Co., Ltd. | Wide-angle lens, imaging module and camera including eight lenses of −−+−++−+ refractive powers |
| JP6754541B1 (en) * | 2020-03-25 | 2020-09-16 | エーエーシー オプティックス ソリューションズ ピーティーイー リミテッド | Imaging lens |
| CN111552061B (en) * | 2020-07-01 | 2024-07-02 | 湖南长步道光学科技有限公司 | Projection lens optical system |
| CN111856729A (en) * | 2020-08-20 | 2020-10-30 | 江西特莱斯光学有限公司 | Wide-angle lens and camera device comprising same |
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| CN107167898A (en) * | 2017-06-29 | 2017-09-15 | 江西联创电子有限公司 | Fish eye lens |
| CN208156289U (en) * | 2018-03-27 | 2018-11-27 | 广东弘景光电科技股份有限公司 | High pixel ultra-wide angle optical system and its camera module of application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107167898A (en) * | 2017-06-29 | 2017-09-15 | 江西联创电子有限公司 | Fish eye lens |
| CN208156289U (en) * | 2018-03-27 | 2018-11-27 | 广东弘景光电科技股份有限公司 | High pixel ultra-wide angle optical system and its camera module of application |
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