CN107121758B - 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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- CN107121758B CN107121758B CN201710516158.8A CN201710516158A CN107121758B CN 107121758 B CN107121758 B CN 107121758B CN 201710516158 A CN201710516158 A CN 201710516158A CN 107121758 B CN107121758 B CN 107121758B
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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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- 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
Abstract
The embodiment of the invention discloses a high-pixel ultra-wide angle optical system, which is sequentially provided with 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, and a fifth lens; the object plane sides of the first lens and the second lens are convex surfaces, the image plane sides of the first lens and the second lens are concave surfaces, and the focal power is negative; the object surface sides of the third lens and the fourth lens are convex surfaces, the image surface side is a convex surface, and the focal power is positive; the object plane side of the fifth lens is a concave surface, the image plane side of the fifth lens is a convex surface, and the focal power of the fifth lens is negative; wherein, the fourth lens and the fifth lens are mutually glued to form a combined lens, and the focal length f45 of the combined lens meets the following condition: 2< f45<10, and satisfies TTL/EFL ≦ 16.5. On the other hand, the embodiment of the invention also provides a camera module. The embodiment of the invention is composed of 5 lenses, the number of the lenses is small, and the structure is simple; the total optical length is short, and the volume is small; has good performances of large aperture, large visual angle, high pixel, good athermalization and the like.
Description
The technical field is as follows:
the invention relates to an optical system and a lens applied by the same, in particular to a high-pixel ultra-wide-angle optical system and a camera module applied by the same.
Background art:
with the application of the panoramic lens shooting technology and the development and utilization of a panoramic parking system, a series of ultra-wide-angle lens products appear on the market: for example, patent application publication No. CN106019540A discloses a fisheye optical lens, but the optical lens uses 6 lenses, which has the defects of large number of lenses and high cost.
The invention content is as follows:
in order to solve the problems of large number of lenses and high cost of the conventional optical system or lens, the embodiment of the invention provides a high-pixel ultra-wide angle optical system on the one hand.
The high-pixel ultra-wide angle optical system is sequentially provided with 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, and a fifth lens;
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, and the focal power of the second lens is negative;
the object surface side of the third lens is a convex surface, the image surface side is a convex surface, and the focal power of the third lens is positive;
the object surface side of the fourth lens is a convex surface, the image surface side of the fourth lens 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 of the fifth lens is a convex surface, and the focal power of the fifth lens is negative;
wherein, the fourth lens and the fifth lens are mutually glued to form a combined lens, and the focal length f45 of the combined lens meets the following condition: 2< f45<10, and satisfies TTL/EFL ≤ 16.5, wherein TTL is the distance between the object plane side vertex of the first lens and the image plane of the optical system, and EFL is the effective focal length of the optical system.
On the other hand, the embodiment of the invention also provides a camera module.
The camera module at least comprises an optical lens, and the high-pixel ultra-wide-angle optical system is installed in the optical lens.
The embodiment of the invention mainly comprises 5 lenses, the number of the lenses is small, and the structure is simple; the total optical length is short, and the volume is small; different lenses are combined with each other and the focal power is reasonably distributed, so that the lens has good performances of large aperture, large visual angle, high pixel, good heat difference elimination and the like.
Description of the drawings:
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an optical system or lens of the present invention;
FIG. 2 is a graph of distortion at +25 ℃ for an optical system or lens of the present invention;
FIG. 3 is a graph of the MTF at +25 ℃ for an optical system or lens of the present invention;
FIG. 4 is a graph of relative illumination at +25 ℃ for an optical system or lens of the present invention;
FIG. 5 is a plot of the 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 implementation mode is as follows:
in order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present 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 merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the high-pixel super-wide angle optical system of the present embodiment includes, in order from the object plane to the image plane 7 along the optical axis: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5.
The object surface side of the first lens 1 is a convex surface, the image surface side is a concave surface, and the focal power is negative;
the object surface side of the second lens 2 is a convex surface, the image surface side is a concave surface, and the focal power is negative;
the object surface side of the third lens 3 is a convex surface, the image surface side is a convex surface, and the focal power is positive;
the object surface side of the fourth lens element 4 is a convex surface, the image surface side is a convex surface, and the focal power thereof 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 of the fifth lens is negative;
wherein, the fourth lens 4 and the fifth lens 5 are mutually glued to form a combined lens, and the focal length f45 of the combined lens meets the following condition: 2< f45<10, and satisfies TTL/EFL ≤ 16.5, where TTL is the distance between the object side vertex of the first lens 1 and the image plane 7, and EFL is the effective focal length of the optical system.
The embodiment of the invention mainly comprises 5 lenses, the number of the lenses is small, and the structure is simple; the total optical length is short, and the volume is small; different lenses are combined with each other and the focal power is reasonably distributed, so that the lens has good performances of large aperture, large visual angle, high pixel, good heat difference elimination and the like.
Further, each lens of the optical system satisfies the following condition:
(1)-8.5<f1/f<-3.5；
(2)-5.5<f2/f<-1.5；
(3)3.0<f3/f<10.0；
(4)0.8<f4/f<3.0；
(5)-5.5<f5/f<-1.5；
wherein f is the focal length of the entire optical system, which takes the effective focal length EFL value of the 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, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens. Through the mutual combination of different lenses and the reasonable distribution of focal power, the optical system has good performances such as large aperture, large visual angle, high pixel and very good athermal difference.
Still further, each lens of the optical system satisfies the following condition:
(1)-10<f1<-3；
(2)-5<f2<-1；
(3)2<f3<10；
(4)0.8<f4<4.5；
(5)-8<f5<-1；
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, and f5 is the focal length of the fifth lens 5. Through the mutual combination of different lenses and the reasonable distribution of focal power, the optical system has good performances such as large aperture, large visual angle, high pixel and very good athermal difference.
Further, the second lens 2, the fourth lens 4, and the fifth lens 5 are all plastic aspheric lenses. The method can effectively eliminate the influence of the spherical aberration on the performance of the lens, improve the resolving power of the optical lens, effectively realize the heat difference elimination, and simultaneously reduce the processing difficulty and the production cost of the lens.
Specifically, the refractive index Nd1 of the material and the abbe constant Vd1 of the first lens 1 satisfy: 1.72< Nd1<1.95, 40< Vd1< 60. Simple structure, can guarantee good optical property.
More specifically, the refractive index Nd2 of the material and the abbe constant Vd2 of the material of the second lens 2 satisfy: 1.45< Nd2<1.65, 40< Vd2< 60. Simple structure, can guarantee good optical property.
More specifically, the refractive index Nd3 of the material and the abbe constant Vd3 of the third lens 3 satisfy: 1.75< Nd3<1.95, 15< Vd3< 35. Simple structure, can guarantee good optical property.
Further, the refractive index Nd4 of the material and the abbe constant Vd4 of the fourth lens 4 satisfy: 1.45< Nd4<1.65, 40< Vd4< 60. Simple structure, can guarantee good optical property.
Still further, the refractive index Nd5 of the material and the abbe constant Vd5 of the fifth lens 5 satisfy: 1.55< Nd5<1.65, 20< Vd5< 40. Simple structure, can guarantee good optical property.
Still further, a diaphragm 6 of the optical system is located between the third lens 3 and the fourth lens 4. For adjusting the intensity of the light beam. Preferably, the stop 6 is disposed on the image side of the fourth lens 4, and in the present embodiment, the positions of the respective lenses and the stop 6 are fixed.
Furthermore, a band-pass filter is arranged between the fifth lens 5 and the image plane 7. The infrared light in the environment can be filtered to avoid the red exposure phenomenon of the image.
Specifically, in this embodiment, the focal length F of the optical system is 0.817mm, the stop index F No. is 2.0, the field angle 2 ω is 203 °, the focal length F1 of the first lens 1 is-5.125 mm, the focal length F2 of the second lens 2 is-2.151 mm, the focal length F3 of the third lens 3 is 33.781mm, the focal length F4 of the fourth lens 4 is 1.361mm, and the focal length F5 of the fifth lens 5 is-3.096 mm. The basic parameters of the optical system are shown in the following table:
in the above table, S1, S2 correspond to two surfaces of the first lens 1 from the object plane to the image plane along the optical axis; s3, S4 correspond to both surfaces of the second lens 2; s5, S6 correspond to both surfaces of the third lens 3; STO is where the diaphragm 6 is located; s8, S9 correspond to both surfaces of the fourth lens 4; s9, S10 correspond to both surfaces of the fifth lens 5; s11, S12 correspond to both surfaces of the bandpass filter located between the fifth lens 5 and the image plane 7; IMA is the image plane 7.
More specifically, the surfaces of the second lens L2, the fourth lens L4, and the fifth lens L5 are aspheric in shape, which satisfies the following equation:
wherein, the parameter c is 1/R, namely the curvature corresponding to the radius, y is a radial coordinate, the unit of which is the same as the unit of the length of the lens, k is a conic coefficient, a1To a5Are respectively in each radial directionAnd the coefficient corresponding to the coordinate. Aspheric correlation values of the S3 surface and the S4 surface of the second lens L2, the S8 surface and the S9 surface of the fourth lens L4, and the S9 surface and the S10 surface of the fifth lens L5 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 excellent athermal performance.
The camera module at least comprises an optical lens, and the high-pixel ultra-wide-angle optical system is installed in the optical lens.
The optical system and the camera module applying the same realize good performances of large aperture, large visual angle, high pixel and the like by adopting different lens combinations and reasonably distributing focal power.
The foregoing is illustrative of one or more embodiments provided in connection with the detailed description and is not intended to limit the practice of the invention to the particular forms disclosed. Similar or identical methods, structures and the like as those of the present invention or several technical deductions or substitutions made on the premise of the conception of the present invention should be considered as the protection scope of the present invention.
Claims (10)
1. The high-pixel ultra-wide angle optical system is sequentially provided with 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, and a fifth lens;
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, and the focal power of the second lens is negative;
the object surface side of the third lens is a convex surface, the image surface side is a convex surface, and the focal power of the third lens is positive;
the object surface side of the fourth lens is a convex surface, the image surface side of the fourth lens 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 of the fifth lens is a convex surface, and the focal power of the fifth lens is negative;
it is characterized in that the preparation method is characterized in that,
the fourth lens and the fifth lens are mutually glued to form a combined lens, and the focal length f45 of the combined lens meets the following condition: 2< f45<10, and satisfies TTL/EFL ≤ 16.5, wherein TTL is the distance between the object plane side vertex of the first lens and the image plane of the optical system, and EFL is the effective focal length of the optical system;
the curvature radius of the object surface side of the first lens is 13.07, the curvature radius of the image surface side of the first lens is 3.07, the thickness of the first lens is 0.7, and the refractive index of the first lens is 1.804; the interval between the first lens and the second lens is 2.11;
the curvature radius of the second lens object surface side is 10.22, the curvature radius of the image surface side is 1.02, the thickness is 0.5, and the refractive index is 1.535; the interval between the second lens and the third lens is 1.22;
the radius of curvature of the object plane side of the third lens is 4.20, the radius of curvature of the image plane side is-10.12, the thickness is 2.55, and the refractive index is 1.846; the interval between the third lens and the diaphragm is 0.7;
the curvature radius of the object plane side of the fourth lens is 1.98, the curvature radius of the image plane side is-0.85, the thickness is 1.51, and the refractive index is 1.535; the interval between the diaphragm and the fourth lens is 0.2;
the curvature radius of the fifth lens on the object plane side is-0.85, the curvature radius of the image plane side is-1.82, the thickness is 0.5, and the refractive index is 1.639; the interval between the fifth lens and the image plane is 3.19;
-5.5< f5/f < -1.5, f being the focal length of the entire optical system, f5 being the focal length of the fifth lens.
2. A high pixel ultra-wide angle optical system as claimed in claim 1, wherein each lens of the optical system satisfies the following condition:
(1)-8.5<f1/f<-3.5；
(2)-5.5<f2/f<-1.5；
(3)3.0<f3/f<10.0；
(4)0.8<f4/f<3.0；
where f is the focal length of the entire 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, and f4 is the focal length of the fourth lens.
3. A high pixel ultra-wide angle optical system as claimed in claim 1, wherein each lens of the optical system satisfies the following condition:
(1)-10<f1<-3；
(2)-5<f2<-1；
(3)2<f3<10；
(4)0.8<f4<4.5；
(5)-8<f5<-1；
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, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens.
4. A high pixel ultra-wide angle optical system according to claim 1, 2 or 3, wherein the second lens, the fourth lens, and the fifth lens are aspheric lenses.
5. A high-pixel ultra-wide-angle optical system as claimed in claim 1, 2 or 3, wherein the refractive index Nd1 of the material and the abbe constant Vd1 of the material of the first lens satisfy: 1.72< Nd1<1.95, 40< Vd1< 60.
6. A high-pixel ultra-wide-angle optical system as claimed in claim 1, 2 or 3, wherein the refractive index Nd2 of the material and the abbe constant Vd2 of the material of the second lens satisfy: 1.45< Nd2<1.65, 40< Vd2< 60.
7. A high-pixel ultra-wide-angle optical system as claimed in claim 1, 2 or 3, wherein the refractive index Nd3 of the material and the abbe constant Vd3 of the material of the third lens satisfy: 1.75< Nd3<1.95, 15< Vd3< 35.
8. A high-pixel ultra-wide-angle optical system as claimed in claim 1, 2 or 3, wherein the refractive index Nd4 of the material and the abbe constant Vd4 of the material of the fourth lens satisfy: 1.45< Nd4<1.65, 40< Vd4< 60.
9. A high-pixel ultra-wide-angle optical system as claimed in claim 1, 2 or 3, wherein the refractive index Nd5 of the material and the abbe constant Vd5 of the material of the fifth lens satisfy: 1.55< Nd5<1.65, 20< Vd5< 40.
10. The camera module at least comprises an optical lens, and is characterized in that the high-pixel ultra-wide angle optical system as claimed in any one of claims 1 to 9 is installed in the optical lens.
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| CN201710516158.8A CN107121758B (en) | 2017-06-29 | 2017-06-29 | High-pixel ultra-wide-angle optical system and camera module applying same |
| PCT/CN2017/116810 WO2019000860A1 (en) | 2017-06-29 | 2017-12-18 | High-pixel ultra-wide angle optical system and camera module applied thereto |
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| CN201710516158.8A CN107121758B (en) | 2017-06-29 | 2017-06-29 | High-pixel ultra-wide-angle optical system and camera module applying same |
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| CN107121758B true CN107121758B (en) | 2020-12-25 |
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| CN107121758B (en) * | 2017-06-29 | 2020-12-25 | 广东弘景光电科技股份有限公司 | High-pixel ultra-wide-angle optical system and camera module applying same |
| CN109975960A (en) * | 2019-04-25 | 2019-07-05 | 协益电子（苏州）有限公司 | One kind looking around wide-angle without thermalization camera lens and automobile panoramic round-looking system |
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| CN101339288A (en) * | 2007-07-05 | 2009-01-07 | 富士能株式会社 | Imaging lens and imaging device |
| CN201222114Y (en) * | 2007-12-05 | 2009-04-15 | 创研光电股份有限公司 | Five-lens type optical image-fetching lens |
| CN201278039Y (en) * | 2008-03-11 | 2009-07-22 | 富士能株式会社 | Photographic lens and photographic device using the lens |
| CN104793321A (en) * | 2015-04-09 | 2015-07-22 | 上海大学 | Super-large field-of-view fish eye lens |
| CN206920689U (en) * | 2017-06-29 | 2018-01-23 | 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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| CN107121758B (en) * | 2017-06-29 | 2020-12-25 | 广东弘景光电科技股份有限公司 | High-pixel ultra-wide-angle optical system and camera module applying same |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339288A (en) * | 2007-07-05 | 2009-01-07 | 富士能株式会社 | Imaging lens and imaging device |
| CN201222114Y (en) * | 2007-12-05 | 2009-04-15 | 创研光电股份有限公司 | Five-lens type optical image-fetching lens |
| CN201278039Y (en) * | 2008-03-11 | 2009-07-22 | 富士能株式会社 | Photographic lens and photographic device using the lens |
| CN104793321A (en) * | 2015-04-09 | 2015-07-22 | 上海大学 | Super-large field-of-view fish eye lens |
| CN206920689U (en) * | 2017-06-29 | 2018-01-23 | 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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