CN108897121B - Small-volume wide-angle optical system and camera module applying same - Google Patents
Small-volume wide-angle optical system and camera module applying same Download PDFInfo
- Publication number
- CN108897121B CN108897121B CN201811007884.8A CN201811007884A CN108897121B CN 108897121 B CN108897121 B CN 108897121B CN 201811007884 A CN201811007884 A CN 201811007884A CN 108897121 B CN108897121 B CN 108897121B
- Authority
- CN
- China
- Prior art keywords
- lens
- optical system
- plane side
- focal length
- convex surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 63
- 239000000463 material Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 6
- 230000004304 visual acuity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G02B13/004—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 four lenses
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The embodiment of the invention discloses a small-volume 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, and a fourth 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 convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive. 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 4 lenses, and have the advantages of less lenses, simple structure and small volume; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of depth information, large viewing angle in horizontal direction, high pixels and the like, and is suitable for the fields of industry and 3D depth imaging.
Description
Technical field:
The invention relates to an optical system and a camera module applied to the optical system, in particular to a small-volume wide-angle optical system and a camera module applied to the optical system.
The background technology is as follows:
the existing optical system or camera module applied to the fields of industry and 3D depth imaging generally has the problems of large number of lenses, complex structure and large volume.
The invention comprises the following steps:
in order to solve the problems of large number of lenses and complex structure of the existing optical system or camera module applied to the fields of industry and 3D depth imaging, the embodiment of the invention provides a small-volume wide-angle optical system.
A small-volume 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, and a fourth 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 convex surface, the image plane side is a convex surface, and the focal power of the fourth 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 small-volume 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 4 lenses, and have the advantages of less lenses, simple structure and small volume; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of depth information, large viewing angle in horizontal direction, high pixels and the like, and is suitable for the fields of industry and 3D depth imaging.
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 field curvature and distortion of an optical system or camera module of the present invention;
fig. 3 is a graph of MTF at 850nm 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 small-volume 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 1, a second lens 2, a third lens 3, and a fourth lens 4.
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 fourth lens element 4 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 comprises 4 lenses, and has the advantages of less lenses, simple structure and small volume; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of depth information, large viewing angle in horizontal direction, high pixels and the like, and is suitable for the fields of industry and 3D depth imaging.
Further, as a preferred embodiment of the present invention, not limited thereto, each lens of the optical system satisfies the following condition:
(1)-0.18<f/f1<-0.07
(2)-0.70<f/f2<-0.25
(3)0.29<f/f3<0.69
(4)0.31<f/f4<0.45
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, and f4 is the focal length of the fourth lens 4. Through the mutual combination of different lenses and the reasonable distribution of the focal power, the lens has good performances of depth information, large viewing angle in the horizontal direction, high pixels and the like.
Still further, as a preferred embodiment of the present embodiment, not limiting, the material refractive index Nd1, the material abbe constant Vd1 of the first lens 1 satisfy: nd1 is more than 1.60, vd1 is less than 28; the focal length f1 of the first lens 1 satisfies: -0.18< f/f1< -0.07, f being the focal length of the whole optical system. The structure is simple, good optical performance can be ensured, and the effect of enlarging the visual angle is achieved; when the refractive index Nd of the lens is higher, the distortion and the volume of the lens can be reduced, and the use value of the lens is improved.
Further, as a preferred embodiment of the present embodiment, not limited thereto, the refractive index Nd2 of the material of the second lens 2, the abbe constant Vd2 of the material satisfy: nd2 is more than 1.49 and less than 1.55,50, vd2 is more than 58; the focal length f2 of the second lens 2 satisfies: -0.70< f/f2< -0.25, f being the focal length of the whole optical system. The structure is simple, good optical performance can be ensured, the visual angle is further ensured, the resolving power of the lens is improved, and the distortion is reduced.
Still further, as a preferred embodiment of the present embodiment, not limiting, the refractive index Nd3 of the material and the abbe constant Vd3 of the third lens 3 satisfy: nd3 is more than 1.60, vd3 is less than 28; the focal length f3 of the third lens 3 satisfies: 0.29< f/f3<0.69, f being the focal length of the whole optical system. The structure is simple, the good optical performance can be ensured, and the resolving power of the lens and the aberration of a balancing system are further improved.
Further, as a preferred embodiment of the present embodiment, not limited thereto, the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens 4 satisfy: nd4 is more than 1.49 and less than 1.55, vd4 is more than 50 and less than 58; the focal length f4 of the fourth lens 4 satisfies: 0.31< f/f4<0.45, f being the focal length of the whole optical system. The structure is simple, the good optical performance can be ensured, the light receiving effect is achieved, and the system distortion is reduced.
Still further, as a preferred embodiment of the present invention, but not limited to, the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4 are all plastic aspherical lenses. The structure is simple, the resolving power of the optical lens can be improved, and good optical performance is ensured.
Further, as a preferred embodiment of the present embodiment, not limiting, an aperture stop 5 of the optical system is located between the third lens 3 and the fourth lens 4, near the third lens 3 side. The structure is simple, and the device is used for adjusting the intensity of the light beam.
Specifically, in conjunction with fig. 1, in the present embodiment, the present optical system matches 1/4″ of a 3D sensor whose focal length F is 1.74mm, diaphragm index F No. 1.2, and horizontal viewing angle is 100 °. The basic parameters of the optical system are shown in the following table:
| Surface of the body | Radius of curvature R (mm) | Interval D (mm) | Refractive index Nd | Dispersion value Vd |
| S1 | 17.100 | 0.500 | 1.61400 | 25.57 |
| S2 | 6.170 | 0.130 | ||
| S3 | 4.500 | 0.540 | 1.53100 | 55.75 |
| S4 | 1.500 | 4.620 | ||
| S5 | 3.400 | 1.870 | 1.61400 | 25.57 |
| S6 | -9.000 | 0.250 | ||
| S7 | INFINITY | 1.840 | ||
| S8 | 6.550 | 1.700 | 1.53100 | 55.75 |
| S9 | -3.350 | 0.300 | ||
| S10 | INFINITY | 0.210 | 1.51700 | 64.21 |
In the table, from the object plane to the image plane 6 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 is one of the surfaces of the filter between the fourth lens 4 and the image plane 6.
More specifically, the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4 are each aspherical in shape, which satisfies the following equation:
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 conic coefficient, and a 1 to a 8 are coefficients corresponding to the radial coordinates respectively. The aspherical correlation values of the S1 and S2 surfaces of the first lens 1, the S3 and S4 surfaces of the second lens 2, the S5 and S6 surfaces of the third lens 3, and the S8 and S9 surfaces of the fourth lens 4 are shown in the following table:
| K | α2 | α3 | α4 | α5 | α6 | α7 | |
| S1 | -2.142 | -7.076E-05 | -3.046E-06 | 8.778E-08 | -1.988E-09 | 2.580E-11 | |
| S2 | 0.579 | 1.065E-03 | -6.359E-06 | 5.214E-07 | 9.333E-08 | 3.880E-09 | |
| S3 | -2.395 | 4.187E-03 | -2.247E-04 | 7.870E-06 | -1.499E-07 | 4.530E-09 | 3.770E-10 |
| S4 | -0.845 | 7.666E-03 | -2.741E-04 | -9.560E-05 | -4.130E-06 | -7.730E-08 | 2.410E-08 |
| S5 | -0.062 | -7.274E-05 | 1.200E-04 | 2.583E-05 | 3.992E-06 | 6.630E-07 | 1.520E-07 |
| S6 | -50.87 | 7.186E-04 | 1.698E-04 | 9.359E-05 | 3.257E-05 | 4.620E-06 | 3.110E-07 |
| S8 | -2.875 | -3.471E-03 | -1.000E-02 | 5.864E-03 | -1.290E-03 | -1.280E-04 | 9.650E-05 |
| S9 | -14.03 | -0.028 | 1.000E-02 | -2.179E-03 | 2.240E-04 | -9.500E-06 | -2.400E-07 |
As can be seen from fig. 2 to 3, 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 small-volume wide-angle optical system is arranged in the optical lens.
The camera module of the embodiment of the invention mainly comprises 4 lenses, and has the advantages of less lenses, simple structure and small volume; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good performances of depth information, large viewing angle in horizontal direction, high pixels and the like, and is suitable for the fields of industry and 3D depth imaging.
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 (2)
1. A small-volume wide-angle optical system 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, and a fourth lens; 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 convex surface, the image plane side is a convex surface, and the focal power of the third lens is positive;
The object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive;
The refractive index Nd1 of the material of the first lens and the Abbe constant Vd1 of the material satisfy the following conditions: nd1 is more than 1.60, vd1 is less than 28; the focal length f1 of the first lens satisfies: -0.18< f/f1< -0.07, f being the focal length of the whole optical system;
each lens of the optical system satisfies the following condition:
(1)-0.18<f/f1<-0.07
(2)-0.70<f/f2<-0.25
(3)0.29<f/f3<0.69
(4)0.31<f/f4<0.45
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, and f4 is the focal length of the fourth lens;
the material refractive index Nd2 and the material abbe constant Vd2 of the second lens satisfy: nd2 is more than 1.49 and less than 1.55,50, vd2 is more than 58; the focal length f2 of the second lens satisfies: -0.70< f/f2< -0.25, f being the focal length of the whole optical system;
the refractive index Nd3 of the material and the abbe constant Vd3 of the third lens satisfy: nd3 is more than 1.60, vd3 is less than 28; the focal length f3 of the third lens satisfies: 0.29< f/f3<0.69, f being the focal length of the whole optical system;
the material refractive index Nd4 and the material abbe constant Vd4 of the fourth lens satisfy: nd4 is more than 1.49 and less than 1.55, vd4 is more than 50 and less than 58; the focal length f4 of the fourth lens satisfies: 0.31< f/f4<0.45, f being the focal length of the whole optical system;
the first lens, the second lens, the third lens and the fourth lens are all plastic aspheric lenses;
an aperture diaphragm of the optical system is positioned between the third lens and the fourth lens and is close to the third lens side;
the horizontal view angle of the optical system is 100 degrees;
An aperture stop 5 of the optical system is located between the third lens 3 and the fourth lens 4, near the third lens 3 side.
2. An image pickup module at least comprising an optical lens, wherein the small-volume wide-angle optical system of claim 1 is installed in the optical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811007884.8A CN108897121B (en) | 2018-08-31 | 2018-08-31 | Small-volume wide-angle optical system and camera module applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811007884.8A CN108897121B (en) | 2018-08-31 | 2018-08-31 | Small-volume wide-angle optical system and camera module applying same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108897121A CN108897121A (en) | 2018-11-27 |
| CN108897121B true CN108897121B (en) | 2024-08-27 |
Family
ID=64359657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811007884.8A Active CN108897121B (en) | 2018-08-31 | 2018-08-31 | Small-volume wide-angle optical system and camera module applying same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108897121B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110737074A (en) * | 2019-10-30 | 2020-01-31 | 广东弘景光电科技股份有限公司 | High-pixel infrared optical system and camera module applying same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101861541A (en) * | 2007-11-22 | 2010-10-13 | 柯尼卡美能达精密光学株式会社 | Wide angle optical system, imaging lens device, monitor camera, and digital apparatus |
| CN208654427U (en) * | 2018-08-31 | 2019-03-26 | 广东弘景光电科技股份有限公司 | Small size wide-angle optics and its camera module of application |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5693352B2 (en) * | 2011-04-25 | 2015-04-01 | 京セラ株式会社 | Imaging lens |
| CN207181800U (en) * | 2017-08-31 | 2018-04-03 | 广东弘景光电科技股份有限公司 | The external adapter imaging optical system of panorama and its external adapter camera lens of panorama of application |
| CN108445608B (en) * | 2018-05-25 | 2023-08-22 | 广东弘景光电科技股份有限公司 | High-pixel wide-angle infrared optical system and camera module applying same |
-
2018
- 2018-08-31 CN CN201811007884.8A patent/CN108897121B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101861541A (en) * | 2007-11-22 | 2010-10-13 | 柯尼卡美能达精密光学株式会社 | Wide angle optical system, imaging lens device, monitor camera, and digital apparatus |
| CN208654427U (en) * | 2018-08-31 | 2019-03-26 | 广东弘景光电科技股份有限公司 | Small size wide-angle optics and its camera module of application |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108897121A (en) | 2018-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110187472B (en) | Lens module | |
| CN103592743B (en) | micro pick-up lens | |
| CN103576296A (en) | Pick-up lens | |
| CN104977696B (en) | Photographing optical lens assembly, image capturing device and mobile terminal | |
| CN107065140B (en) | Intelligent vehicle-mounted high-pixel wide-angle lens | |
| CN108445608B (en) | High-pixel wide-angle infrared optical system and camera module applying same | |
| JP2017026764A (en) | Imaging lens | |
| JP2017187703A (en) | Imaging lens | |
| CN106569313B (en) | Optical imaging system | |
| CN109239894B (en) | Optical imaging system | |
| KR20200089235A (en) | Photographic objective having at least six lenses | |
| CN203606559U (en) | Mini-size imaging lens | |
| JP2017173656A (en) | Image capturing lens | |
| CN109116516B (en) | Large aperture optical system and camera module using same | |
| JP2017026869A (en) | Imaging lens | |
| JP2017072797A (en) | Imaging lens | |
| JP5836532B1 (en) | Imaging lens | |
| JP2017026731A (en) | Imaging lens | |
| CN111722378B (en) | Large-image-surface high-resolution fish-eye lens | |
| JP5843996B1 (en) | Imaging lens | |
| CN109085690B (en) | Five-piece imaging lens group | |
| CN107608058B (en) | Low distortion wide angle optical system | |
| CN107728293B (en) | High-pixel ultra-wide angle optical system | |
| CN112612135B (en) | Eyepiece optical system | |
| JP2017151237A (en) | Imaging lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |