CN108761745B - Wide-angle optical system and camera module using same - Google Patents
Wide-angle optical system and camera module using same Download PDFInfo
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- CN108761745B CN108761745B CN201810823473.XA CN201810823473A CN108761745B CN 108761745 B CN108761745 B CN 108761745B CN 201810823473 A CN201810823473 A CN 201810823473A CN 108761745 B CN108761745 B CN 108761745B
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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
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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
Abstract
The embodiment of the invention discloses a 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. On the other hand, the embodiment of the invention also provides a camera module. The optical system and the camera module of the embodiment of the invention mainly comprise 8 lenses, and have the advantages of less lenses, simple structure and reasonable cost; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of large aperture, large visual angle, high pixel, very good athermal performance and the like, and is suitable for the field of automobile auxiliary driving.
Description
Technical field:
the present invention relates to an optical system and an imaging module using the same, and more particularly, to a wide-angle optical system and an imaging module using the same.
The background technology is as follows:
the existing rearview wide-angle optical system for automobile assisted driving and the camera module applied to the same generally have the problems of large number of lenses and complex structure.
The invention comprises the following steps:
in order to solve the problems of large number of lenses and complex structure of the existing rearview wide-angle optical system applied to automobile assisted driving and an imaging module applied to the rearview wide-angle optical system, the embodiment of the invention provides a wide-angle optical system.
A wide angle optical system comprising, in order 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 concave surface, the image plane side is a convex surface, and the focal power of the third lens is positive or negative;
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 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 concave surface, the image plane side is a concave surface, and the focal power of the sixth lens is negative;
the object plane side of the seventh lens is a convex surface, the image plane side is a convex surface, and the focal power of the seventh lens is positive;
the object plane side of the eighth lens is a concave surface, the image plane side is a convex surface, and the focal power of the eighth lens is positive or negative.
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 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 the advantages of less lenses, simple structure and reasonable cost; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of large aperture, large visual angle, high pixel, very good athermal performance and the like, and is suitable for the field of automobile auxiliary driving.
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 camera module according to the present invention;
FIG. 2 is a graph of distortion at +25℃;
FIG. 3 is a graph showing MTF at +25℃;
FIG. 4 is a graph showing the relative illuminance at +25℃;
FIG. 5 is a graph of MTF at-40 ℃ for an optical system or camera module of the present invention;
fig. 6 is a graph of MTF at +85 ℃ for an optical system or camera module 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.
The embodiment of the invention provides a wide-angle optical system, as shown in fig. 1, which sequentially includes, 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, 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 concave surface, the image plane side is a convex surface, and the focal power of the third lens is positive or negative;
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 convex surface, the image plane side is a convex surface, and the focal power thereof is positive;
the object plane side of the sixth lens 6 is a concave surface, the image plane side is a concave surface, and the focal power thereof is negative;
the object plane side of the seventh lens 7 is a convex surface, the image plane side is a convex surface, and the focal power thereof is positive;
the eighth lens element 8 has a concave object-side surface and a convex image-side surface, and has positive or negative optical power.
The optical system of the embodiment of the invention mainly consists of 8 lenses, and has the advantages of less lenses, simple structure and reasonable cost; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of large aperture, large visual angle, high pixel, very good athermal performance and the like, and is suitable for the field of automobile auxiliary driving.
Further, as a preferred embodiment of the present embodiment, not limiting, the optical system satisfies: TTL/EFL is less than or equal to 11.25, wherein TTL is the distance between the object plane side vertex of the first lens 1 of the optical system and the imaging plane 10, and EFL is the effective focal length of the optical system. 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.
Still further, as a preferred embodiment of the present solution, not limiting, the fifth lens 5 and the sixth lens 6 are cemented with each other to form a combined lens, the focal length f56 of which satisfies: -100< f56< -10. The structure is simple and compact, different lenses are combined with each other and the focal power is reasonably distributed, and the lens has good performances of large aperture, large visual angle, high pixel, very good athermalization and the like
Still further, as a specific embodiment of the present invention, not limited thereto, each lens of the optical system satisfies the following condition:
(1)-30<f1<-5；
(2)-50<f2<-10；
(3)-500<f3<500；
(4)5<f4<15；
(5)3<f5<10；
(6)-10<f6<-2；
(7)2<f7<12；
(8)-50<f8<50；
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. Through the mutual combination of different lenses and the reasonable distribution of the focal power, the optical system has the good performances of large aperture, large visual angle, high pixel, very good athermalization and the like.
Still further, as a preferred embodiment of the present invention, not limiting, each lens of the optical system satisfies the following condition:
(1)-12<f1/f<-2；
(2)-15<f2/f<-2；
(3)-200<f3/f<200；
(4)1.5<f4/f<10；
(5)1.5<f5/f<10；
(6)-5.5<f6/f<-0.8；
(7)1.5<f7/f<10；
(8)-15<f8/f<15；
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. Through the mutual combination of different lenses and the reasonable distribution of the focal power, the optical system has the good performances of large aperture, large visual angle, high pixel, very good athermalization and the like.
Further, as a specific embodiment of the present embodiment, but not limited to, the refractive index Nd1 of the material and the abbe constant Vd1 of the first lens 1 satisfy: 1.68< nd1<1.95, 30< vd1<60; the focal length f1 of the first lens 1 satisfies: -12< f1/f < -2, f being 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 embodiment, without limitation, 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 focal length f2 of the second lens 2 satisfies: -15< f2/f < -2, f being 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 embodiment, without limitation, the refractive index Nd3 of the material and the abbe constant Vd3 of the third lens 3 satisfy: 1.72< Nd3<1.92, 15< Vd3<35; the focal length f3 of the third lens 3 satisfies: -200< f3/f <200, f being the focal length of the whole optical system. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment of the present embodiment, but not limited to, the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens 4 satisfy: 1.65< nd4<1.85, 35< vd4<55; the focal length f4 of the fourth lens 4 satisfies: 1.5< f4/f <10, 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 embodiment, without limitation, 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 focal length f5 of the fifth lens 5 satisfies: 1.5< f5/f <10, f is the focal length of the entire optical system. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment of the present embodiment, without limitation, the refractive index Nd6 of the material of the sixth lens 6, the abbe constant Vd6 of the material satisfy: 1.75< nd6<1.95, 17< vd6<35; the focal length f6 of the sixth lens 6 satisfies: -5.5< f6/f < -0.8, f being the focal length of the whole optical system. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment of the present embodiment, but not limited to, the refractive index Nd7 of the material and the abbe constant Vd7 of the seventh lens 7 satisfy: 1.55< Nd7<1.65, 40< Vd7<60; the focal length f7 of the seventh lens 7 satisfies: 1.5< f7/f <10, 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 embodiment, without limitation, the refractive index Nd8 of the material of the eighth lens 8, the abbe constant Vd8 of the material satisfy: 1.55< Nd8<1.65, 40< Vd8<60; the focal length f8 of the eighth lens 8 satisfies: -15< f8/f <15, f being the focal length of the whole optical system. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment of the present embodiment, but not limited to, the second lens 2, the seventh lens 7, and the eighth lens 8 are all aspherical lenses. The structure is simple, the resolving power of the optical lens can be improved, the heat difference can be effectively eliminated, and meanwhile, the processing difficulty and the production cost of the lens are reduced.
Further, as a specific embodiment of the present solution, not limiting, a diaphragm 9 of the optical system is located between the third lens 3 and the fourth lens 4. The structure is simple, and the device is used for adjusting the intensity of the light beam. Preferably, the diaphragm 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.
Further, as a specific embodiment of the present embodiment, but not limited to, a bandpass filter is provided between the eighth lens 8 and the image plane 10. The structure is simple, and infrared light in the environment can be filtered, so that the phenomenon of red exposure of images is avoided.
Specifically, in the present embodiment, with reference to fig. 1, the focal length F of the present optical system is 3.417mm, the stop index F No. is 2.0, the angle of view 2ω=170°, the focal length f1= -14.5mm of the first lens 1, the focal length f2= -34.3mm of the second lens 2, the focal length f3= -315mm of the third lens 3, the focal length f4=9.5 mm of the fourth lens 4, the focal length f5=7.4 mm of the fifth lens 5, the focal length f6= -4.1mm of the sixth lens 6, the focal length f7=7.8 mm of the seventh lens 7, and the focal length f8= -25mm of the eighth lens 8. The basic parameters of the optical system are shown in the following table:
in the table, from the object plane to the image plane 10 along the optical axis, S1 and S2 are two surfaces of the first lens 1; 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 is a diaphragm STO; s8 and S9 correspond to two surfaces of the fourth lens 4; s10 and S11 correspond to two surfaces of the fifth lens 5; s11 and S12 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 seventh lens 7, and the eighth lens 8 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 5 Respectively radial coordinates ofThe corresponding coefficients. 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 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 the advantages of less lenses, simple structure and reasonable cost; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of large aperture, large visual angle, high pixel, very good athermal performance and the like, and is suitable for the field of automobile auxiliary driving.
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 wide-angle optical system is composed of 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 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 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 concave surface, the image plane side is a convex surface, and the focal power of the third lens is negative;
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 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 concave surface, the image plane side is a concave surface, and the focal power of the sixth lens is negative;
the object plane side of the seventh lens is a convex surface, the image plane side is a convex surface, and the focal power of the seventh lens is positive;
the object plane side of the eighth lens is a concave surface, the image plane side is a convex surface, and the focal power of the eighth lens is negative;
the optical system satisfies: TTL/EFL is less than or equal to 11.25, wherein TTL is the distance between the top of the object plane side of the first lens of the optical system and the imaging plane, and EFL is the effective focal length of the optical system;
each lens of the optical system satisfies the following condition:
-30mm＜f1＜-5mm；
-50mm＜f2＜-10mm；
-500mm＜f3＜500mm；
5mm＜f4＜15mm；
3mm＜f5＜10mm；
-10mm＜f6＜-2mm；
2mm＜f7＜12mm；
-50mm＜f8＜50mm；
-12＜f1/f＜-2；
-15＜f2/f＜-2；
-200＜f3/f＜200；
1.5＜f4/f＜10；
1.5＜f5/f＜10；
-5.5＜f6/f＜-0.8；
1.5＜f7/f＜10；
-15＜f8/f＜15；
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, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens.
2. The wide-angle optical system of claim 1, wherein the fifth lens and the sixth lens are cemented with each other to form a combined lens, and a focal length f56 of the combined lens satisfies: -100mm < f56< -10mm.
3. The wide-angle optical system as set forth in claim 1, wherein the material refractive index Nd1, the material abbe constant Vd1 of the first lens satisfy: nd1 is more than 1.68 and less than 1.95, vd1 is more than 30 and less than 60.
4. The wide-angle optical system as set forth in claim 1, wherein the material refractive index Nd2, the material abbe constant Vd2 of the second lens satisfy: nd2 is more than 1.45 and less than 1.65, vd2 is more than 40 and less than 60.
5. The wide-angle optical system as set forth in claim 1, wherein a material refractive index Nd3, a material abbe constant Vd3 of the third lens satisfy: nd3 is more than 1.72 and less than 1.92, vd3 is more than 15 and less than 35.
6. The wide-angle optical system as set forth in claim 1, wherein the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens satisfy: nd4 is more than 1.65 and less than 1.85, vd4 is more than 35 and less than 55.
7. An image pickup module comprising at least an optical lens, wherein the wide-angle optical system according to any one of claims 1 to 6 is installed in the optical lens.
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| CN110609378B (en) * | 2019-08-20 | 2021-06-25 | 江西联创电子有限公司 | Wide-angle lens and imaging apparatus |
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| JP2014178522A (en) * | 2013-03-15 | 2014-09-25 | Ricoh Co Ltd | Imaging optical system, camera device, and portable information terminal device |
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