CN107193111B - High-pixel fisheye optical system and camera module applying same - Google Patents
High-pixel fisheye optical system and camera module applying same Download PDFInfo
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- CN107193111B CN107193111B CN201710605653.6A CN201710605653A CN107193111B CN 107193111 B CN107193111 B CN 107193111B CN 201710605653 A CN201710605653 A CN 201710605653A CN 107193111 B CN107193111 B CN 107193111B
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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
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Abstract
The embodiment of the invention discloses a high-pixel fish-eye 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, a fifth lens, a sixth lens, and a seventh 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 powers of the first lens and the second lens are negative; the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative; the object plane sides of the fourth lens, the fifth lens and the seventh lens are convex surfaces, the image plane sides of the fourth lens, the fifth lens and the seventh lens are convex surfaces, and the focal powers of the fourth lens, the fifth lens and the seventh lens are positive; the fifth lens and the sixth lens are mutually glued to form a combined lens, and the focal length f56 of the combined lens meets the following condition: 0.08-woven-fabric f/f56<0.17, f is the focal length of the whole optical system. On the other hand, the embodiment of the invention also provides a camera module. The embodiment of the invention has simple structure and small volume; has good performances of large aperture, large visual angle, high pixel of more than 1600 ten thousand, and the like.
Description
The technical field is as follows:
the invention relates to an optical system and a camera module applied by the same, in particular to a high-pixel fisheye optical system and a camera module applied by the same.
Background art:
the existing fish-eye optical system or lens applied to the panoramic VR camera or the monitoring field has the defects of complex structure, large volume and insufficient height of pixels.
The invention content is as follows:
in order to overcome the problem that the existing fisheye optical system or lens is complex in structure, the embodiment of the invention provides a high-pixel fisheye optical system on the one hand.
High pixel fish eye optical system follows the optical axis and is equipped with from the object plane to image plane in proper order: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh 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 concave surface, the image surface side of the third lens is a convex surface, and the focal power of the third lens is negative;
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 surface side of the fifth lens is a convex surface, the image surface side of the fifth lens is a convex surface, and the focal power of the fifth lens is positive;
the object surface side of the seventh lens is a convex surface, the image surface side of the seventh lens is a convex surface, and the focal power of the seventh lens is positive;
wherein, the fifth lens and the sixth lens are mutually glued to form a combined lens, and the focal length f56 of the combined lens meets the following condition: 0.08 and < -f/f 56<0.17, f is the focal length of the whole 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 fisheye optical system is installed in the optical lens.
The embodiment of the invention mainly comprises 7 lenses, and has reasonable number of lenses, simple structure and small volume; 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 of more than 1600 thousands and the like. Be applicable to panorama VR camera and 360 no dead angles control field.
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 structural diagram of an optical system or a camera module according to an embodiment of the present invention;
FIG. 2 is a graph showing curvature of field and distortion of an optical system or a camera module according to an embodiment of the present invention;
FIG. 3 is a chromatic aberration diagram of an optical system or a camera module according to an embodiment of the present invention;
fig. 4 is a graph of MTF transfer function of an optical system or a camera module according to an embodiment of the present invention;
fig. 5 is a diagram of relative illumination of an optical system or a camera module according to an embodiment of the 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 fisheye optical system of the present embodiment includes, in order from the object plane to the image plane along the 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, and a seventh lens 7.
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 concave surface, the image surface side is a convex surface, and the focal power is negative;
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 fifth lens element 5 has a convex object surface side and a convex image surface side, and has positive focal power;
the seventh lens element 7 has a convex object surface side and a convex image surface side, and has positive refractive power;
wherein the fifth lens 5 and the sixth lens 6 are mutually cemented to form a combined lens, and the focal length f56 of the combined lens satisfies the following condition: 0.08-woven-fabric f/f56<0.17, f is the focal length of the whole optical system.
The embodiment of the invention mainly comprises 7 lenses, and has reasonable number of lenses, simple structure and small volume; 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 of more than 1600 thousands and the like. Be applicable to panorama VR camera and 360 no dead angles control field.
Further, the optical system satisfies the following condition:
(1)0.31<f/fⅠ<0.38；
(2)0.33<f/fⅡ<0.43；
where fi is a combined focal length of the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4, and fi is a combined focal length of the fifth lens 5, the sixth lens 6, and the seventh lens 7. 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 of more than 1600 thousands and the like.
Still further, each lens of the optical system satisfies the following condition:
(1)-0.21<f/f1<-0.11；
(2)-0.50<f/f2<-0.25；
(3)-0.13<f/f3<0；
(4)0.37<f/f4<0.49；
(5)0.19<f/f7<0.29；
wherein f1 is the focal length of the first lens element 1, f2 is the focal length of the second lens element 2, f3 is the focal length of the third lens element 3, f4 is the focal length of the fourth lens element 4, and f7 is the focal length of the seventh lens element 7. Through the mutual combination of different lenses and reasonable distribution of focal power, the lens has good performances of large aperture, large visual angle, high pixel of more than 1600 thousands and the like.
Still further, the second lens 2, the fourth lens 4, and the seventh lens 7 are all aspheric lenses. The resolving power of the optical lens can be improved, the heat dissipation difference can be effectively realized, and the processing difficulty of the lens is reduced.
Further, the refractive index Nd1 of the material and the abbe constant Vd1 of the material of the first lens 1 satisfy: nd1 is less than 1.72, and Vd1 is more than 52. Simple structure, can guarantee good optical property.
Still further, the refractive index Nd2 of the material of the second lens 2 and the abbe constant Vd2 of the material satisfy: nd2 is less than 1.60, and Vd2 is more than 61. Simple structure, can guarantee good optical property.
Still further, the refractive index Nd3 of the material of the third lens 3 and the abbe constant Vd3 of the material satisfy: nd3 is more than 1.88, and Vd3 is less than 40. Simple structure, can guarantee good optical property.
Still further, the refractive index Nd4 of the material of the fourth lens 4 and the abbe constant Vd4 of the material satisfy: nd4 is more than 1.75, and Vd4 is less than 50. Simple structure, can guarantee good optical property.
Further, the refractive index Nd5 of the material of the fifth lens 5 and the abbe constant Vd5 of the material satisfy: nd5 is less than 1.71, vd5 is more than 55; the refractive index Nd6 of the material of the sixth lens 6 and the Abbe constant Vd6 of the material satisfy: nd6 is more than 2.0, and Vd6 is less than 20. Simple structure, can guarantee good optical property.
Still further, the material refractive index Nd7 and the material abbe constant Vd7 of the seventh lens 7 satisfy: nd7 is more than 1.85, vd7 is less than 41. Simple structure, can guarantee good optical property.
Further, an aperture stop 8 of the optical system is located between the fourth lens 4 and the fifth lens 5. For adjusting the intensity of the light beam.
Still further, the first lens 1 to the seventh lens 7 are all glass lenses. Simple structure, can guarantee good optical property.
Furthermore, a band-pass filter is arranged between the seventh lens 7 and the image plane 9. The infrared light in the environment can be filtered to avoid the red exposure phenomenon of the image.
Specifically, in the present embodiment, the focal length F of the present optical system is 2.163mm, the stop index F No. is 2.4, the field angle 2 ω =185 ° (Φ 6.29 mm), and the total optical length TTL =17mm. The basic parameters of the optical system are shown in the following table:
in the above table, S1 and 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 the two surfaces of the second lens 2; s5, S6 correspond to both surfaces of the third lens 3; s7, S8 correspond to both surfaces of the fourth lens 4; STO is where stop 8 is located; s10, S11 correspond to both surfaces of the fifth lens 5; s11, S12 correspond to both surfaces of the sixth lens 6; s13, S14 correspond to both surfaces of the seventh lens 7; s15, S16 correspond to both surfaces of the band pass filter positioned between the seventh lens 7 and the image plane 9.
More specifically, the surfaces of the second lens 2, the fourth lens 4, and the seventh lens 7 are aspherical shapes, which satisfy the following equations:
wherein, the parameter c =1/R is curvature corresponding to radius, y is radial coordinate with the same unit as the length unit of the lens, k is conic section coefficient, a 1 To a 8 The coefficients are respectively corresponding to the radial coordinates. The aspherical correlation values of the S3 surface and the S4 surface of the second lens 2, the S7 surface and the S8 surface of the fourth lens 4, and the S13 surface and the S14 surface of the seventh lens 7 are shown in the following table:
| K | α 2 | α 3 | α 4 | α 5 | α 6 | |
| S3 | 2.244 | -3.8527E-04 | -2.2836E-04 | 6.3717E-06 | 1.4687E-07 | -9.5505E-09 |
| S4 | -0.448 | 6.6616E-03 | 1.1542E-03 | 4.6063E-04 | -5.8708E-05 | 7.5552E-07 |
| S7 | -0.232 | 3.3061E-03 | 3.7949E-04 | 2.2909E-05 | -3.0833E-05 | 1.5748 |
| S8 | ||||||
| 0 | 6.1521E-03 | -3.7346E-04 | 3.2156E-05 | 1.9467E-04 | -1.5922E-05 | |
| S13 | -4.842 | -1.3050E-03 | 2.2048E-04 | 1.1111E-05 | -4.5173E-06 | 1.5622E-07 |
| S14 | 105.824 | -3.9260E-04 | -2.2887E-04 | -3.8529E-06 | -8.6526E-07 | 5.5208E-08 |
as can be seen from fig. 2 to 5, the optical system in this embodiment has good performance such as large aperture, large viewing angle, and high pixel of 1600 ten thousand or more.
The camera module at least comprises an optical lens, and the high-pixel fisheye 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 of more than 1600 ten thousand 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 (7)
1. High pixel fish eye optical system follows the optical axis and is equipped with from the object plane to image plane in proper order: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the optical lens is characterized in that 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 plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative;
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 surface side of the fifth lens is a convex surface, the image surface side of the fifth lens is a convex surface, and the focal power of the fifth lens is positive;
the object surface side of the seventh lens is a convex surface, the image surface side of the seventh lens is a convex surface, and the focal power of the seventh lens is positive;
wherein, the fifth lens and the sixth lens are mutually glued to form a combined lens, and the focal length f56 of the combined lens meets the following condition: 0.08-woven-fabric f/f56<0.17, wherein f is the focal length of the whole optical system;
the second lens, the fourth lens and the seventh lens are all aspheric lenses;
the optical system satisfies the following conditions:
0.31<f/fⅠ<0.38；
0.33<f/fⅡ<0.43；
-0.21<f/f1<-0.11；
-0.50<f/f2<-0.25；
-0.13<f/f3<0；
0.37<f/f4<0.49；
0.19<f/f7<0.29；
wherein, fi is the combined focal length of the first lens, the second lens, the third lens and the fourth lens, fi is the combined focal length of the fifth lens, the sixth lens and the seventh lens, 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 f7 is the focal length of the seventh lens.
2. The high-pixel fish-eye optical system according to claim 1, wherein the refractive index Nd1 of the material and the abbe constant Vd1 of the material of the first lens satisfy: nd1 is less than 1.72, and Vd1 is more than 52.
3. The high-pixel fish-eye optical system according to claim 1, wherein the refractive index Nd2 of the material and the abbe constant Vd2 of the material of the second lens satisfy: nd2 is less than 1.60, and Vd2 is more than 61.
4. The high-pixel fish-eye optical system according to claim 1, wherein the refractive index Nd3 of the material and the abbe constant Vd3 of the material of the third lens satisfy: nd3 is more than 1.88, and Vd3 is less than 40.
5. The high-pixel fish-eye optical system according to claim 1, wherein a material refractive index Nd4 and a material abbe constant Vd4 of the fourth lens satisfy: nd4 is more than 1.75, and Vd4 is less than 50.
6. The high-pixel fish-eye optical system according to claim 1, wherein a material refractive index Nd5 and a material abbe constant Vd5 of the fifth lens satisfy: nd5 is less than 1.71, vd5 is more than 55; the refractive index Nd6 of the material of the sixth lens and the Abbe constant Vd6 of the material satisfy that: nd6 is more than 2.0, and Vd6 is less than 20.
7. The camera module at least comprises an optical lens, and is characterized in that the high-pixel fisheye optical system of any one of claims 1-6 is installed in the optical lens.
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| CN107728293B (en) * | 2017-11-08 | 2023-10-27 | 广东弘景光电科技股份有限公司 | High-pixel ultra-wide angle optical system |
| CN109960020B (en) * | 2017-12-22 | 2021-10-29 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN109991719A (en) * | 2019-03-18 | 2019-07-09 | 广东弘景光电科技股份有限公司 | High definition wide-angle day and night confocal optical system and its camera module of application |
| CN113109922B (en) * | 2021-04-01 | 2024-05-24 | 南阳利达光电有限公司 | Large-aperture high-definition vehicle-mounted lens for target identification |
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