CN209167653U - A kind of ultra-thin fish eye lens - Google Patents
A kind of ultra-thin fish eye lens Download PDFInfo
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- CN209167653U CN209167653U CN201920013311.XU CN201920013311U CN209167653U CN 209167653 U CN209167653 U CN 209167653U CN 201920013311 U CN201920013311 U CN 201920013311U CN 209167653 U CN209167653 U CN 209167653U
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Abstract
The utility model discloses a kind of ultra-thin fish eye lens, the optical system of camera lens successively includes: the first lens, the second lens, diaphragm, the third lens, the 4th lens, the 5th lens from object plane to image planes along optical axis；First lens object plane side is convex surface, image planes side is concave surface；Second lens object plane side is convex surface, image planes side is plane；The third lens object plane side is concave surface, image planes side is convex surface；4th lens object plane side is convex surface, image planes side is convex surface；5th lens object plane side is concave surface, image planes side is convex surface；Wherein f1 is first focal length of lens, and f is system whole focal length, and meets following condition: -1.5 < (f1/f) < -0.7；The utility model solves that existing fish eye lens eyeglass is excessive, and volume is larger, problem at high cost and big difficulty of processing.
Description
Technical field
The utility model relates to technical field of optical, especially a kind of ultra-thin fish eye lens.
Background technique
Fish eye lens is the wide-angle lens that a kind of front lens diameter is very short and is in parabolical and protrudes to camera lens front, burnt
170 ° or more are up to away from extremely short and field angle；Due to the field angle advantage with super large, fish eye lens is widely used in high definition
The field of photography such as moving camera, unmanned plane camera, overall view monitoring.Currently, with the development of optical lens technology, although flake mirror
The structure type of head is constantly improved, but fish-eye number of lenses in the prior art is more, causes entire fish
The volume of glasses head is larger, and higher cost, and difficulty of processing is big, is unfavorable for the miniaturization of entire camera lens, and high expensive.This
Outside, in order to obtain high-resolution imaging, big wide-angle class fish eye lens has to carry out ratio chromatism, correction, but the prior art
In, many fish eye lens manufacturers are in order to reduce cost, the eyeglass for using many plastic cement aspherical in fish eye lens, however plastic cement
Type it is seldom, correction multiplying power is relatively difficult to realize, and plastic cement is more sensitive to temperature, so that fish eye lens is difficult to be applicable in
In the occasion of high temperature or low temperature.
Utility model content
In order to overcome above-mentioned deficiency, the purpose of this utility model is to provide for a kind of ultra-thin fish eye lens, realizes flake mirror
Super-thin small, wide-angle, big target surface, low cost and the low requirement of difficulty of processing of head.
In order to achieve the above objectives, the utility model is implemented according to following technical scheme:
A kind of ultra-thin fish eye lens, the optical system of the camera lens successively include: first saturating from object plane to image planes along optical axis
Mirror, the second lens, diaphragm, the third lens, the 4th lens, the 5th lens；The first lens object plane side is convex surface, image planes side is
Concave surface；The second lens object plane side is convex surface, image planes side is plane；The third lens object plane side is concave surface, image planes side is
Convex surface；4th lens object plane side is convex surface, image planes side is convex surface；5th lens object plane side is concave surface, image planes side is
Convex surface；Wherein f1 is first focal length of lens, and f is system whole focal length, and meets following condition: -1.5 < (f1/f) < -0.7.
Further, the optical system also meets following condition:
(1) 1.65 < Nd1 < 1.70,40 < Vd1 < 60；
(2) 1.90 < Nd2 < 1.95,17 < Vd2 < 25；
(3) 1.70 < Nd3 < 1.90,40 < Vd3 < 60；
(4) 1.65 < Nd4 < 1.85,40 < Vd4 < 60；
(5) 1.90 < Nd5 < 1.95,17 < Vd5 < 25；
Wherein: Nd1 is the refractive index of the first lens, and Vd1 is the abbe number of the first lens；Nd2 is the folding of the second lens
Rate is penetrated, Vd2 is the abbe number of the second lens；Nd3 is the refractive index of the third lens, and Vd3 is the abbe number of the third lens；
Nd4 is the refractive index of the 4th lens, and Vd4 is the abbe number of the 4th lens；Nd5 is the refractive index of the 5th lens, and Vd5 is the 5th
The abbe number of lens.
Further, first power of lens is negative, and focal length f1 is -2.83mm.
Further, second power of lens is positive, and focal length f2 is 9.08mm.
Further, the focal power of the third lens is positive, and focal length f3 is 5.77mm.
Further, the 4th power of lens is positive, and focal length f4 is 2.92mm.
Further, the 5th power of lens is negative, and focal length f5 is -4.67mm.
Further, shown 4th lens and the 5th lens are one group of balsaming lens
Further, protection glass is additionally provided between the 5th lens and image planes.
Compared with prior art, the utility model has the beneficial effects that
1. five eyeglass compositions, at low cost, small in size.
2. the second lens image planes side is that plane makes to assemble more stable, it is not susceptible to tilt, greatly reduces difficulty of processing.
3. effective viewing field angle reaches 176 degree or more.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the lens schematic diagram of the utility model embodiment；
Fig. 2 is first analysis diagram of the utility model embodiment；
Fig. 3 is second analysis diagram of the utility model embodiment；
Fig. 4 is the curvature of field figure of the utility model embodiment；
Fig. 5 is the distortion figure of the utility model embodiment；
Fig. 6 is the relative illumination figure of the utility model embodiment.
Specific embodiment
The utility model will be further described below with reference to the accompanying drawings and specific embodiments, in the signal of this utility model
Property embodiment and explanation be used to explain the utility model, but be not intended to limit the scope of the present invention.
A kind of ultra-thin fish eye lens as shown in Figure 1, the optical system of the camera lens along optical axis from object plane to image planes successively
It include: the first lens E1, the second lens E2, diaphragm ST, the third lens E3, the 4th lens E4, the 5th lens E5；Described first thoroughly
Mirror E1 object plane side is convex surface, image planes side is concave surface；Second lens E2 object plane side is convex surface, image planes side is plane；Described
Three lens E3 object plane sides are concave surface, image planes side is convex surface；The 4th lens E4 object plane side is convex surface, image planes side is convex surface；Institute
State that the 5th lens E5 object plane side is concave surface, image planes side is convex surface；Wherein f1 is the first lens E1 focal length, and f is system whole focal length,
And meet following condition: -1.5 < (f1/f) < -0.7.
Further, the optical system also meets following condition:
(1) 1.65 < Nd1 < 1.70,40 < Vd1 < 60；
(2) 1.90 < Nd2 < 1.95,17 < Vd2 < 25；
(3) 1.70 < Nd3 < 1.90,40 < Vd3 < 60；
(4) 1.65 < Nd4 < 1.85,40 < Vd4 < 60；
(5) 1.90 < Nd5 < 1.95,17 < Vd5 < 25；
Wherein: Nd1 is the refractive index of the first lens E1, and Vd1 is the abbe number of the first lens E1；Nd2 is the second lens
The refractive index of E2, Vd2 are the abbe number of the second lens E2；Nd3 is the refractive index of the third lens E3, and Vd3 is the third lens E3
Abbe number；Nd4 is the refractive index of the 4th lens E4, and Vd4 is the abbe number of the 4th lens E4；Nd5 is the 5th lens E5
Refractive index, Vd5 be the 5th lens E5 abbe number.
Further, the focal power of the first lens E1 is negative, and focal length f1 is -2.83mm.
Further, the focal power of the second lens E2 is positive, and focal length f2 is 9.08mm.
Further, the focal power of the third lens E3 is positive, and focal length f3 is 5.77mm.
Further, the focal power of the 4th lens E4 is positive, and focal length f4 is 2.92mm.
Further, the focal power of the 5th lens E5 is negative, and focal length f5 is -4.67mm.
Further, shown 4th lens and the 5th lens are one group of balsaming lens.
Further, protection glass E6 is additionally provided between the 5th lens E5 and image planes.
Wherein: as shown in fig. 1, the first lens E1 object plane side is S1, image planes side S2；Second lens E2 object plane side is
S3, image planes side S4；The third lens E3 object plane side is S5, image planes side S6；4th lens E4 object plane side is S7, the 4th lens E4
Cemented surface with the 5th lens E5 is S8, and the 5th lens E5 image planes side is S9.
In order to verify the ultra-thin fish-eye optical property of the present embodiment, when operating distance is infinity, ultra-thin fish
Total focal length f=2.57mm, the FNO=2.5 of glasses head, FOV=177 ° of field angle, the parameters of lens group are successively listed in table 1
In:
Table 1
In above table, Index is refractive index, and Radius is radius of curvature, and ABB is abbe number, the first lens~the
The focal length of five lens successively is f1~f5, can be obtained by table 1:
(f1/f)=- 2.830207/2.57=-1.101 meets the design of -1.5 above-mentioned < (f1/f) < -0.7；
Nd1=1.66, Vd1=48.55 meet above-mentioned 1.65 < Nd1 < 1.70, the design of 40 < Vd1 < 60；
Nd2=1.922866, Vd2=20.882149 meet above-mentioned 1.90 < Nd2 < 1.95, the design of 17 < Vd2 < 25；
Nd3=1.785, Vd3=48.57 meet above-mentioned 1.70 < Nd3 < 1.90, the design of 40 < Vd3 < 60；
Nd4=1.722, Vd4=52.77 meet above-mentioned 1.65 < Nd4 < 1.85, the design of 40 < Vd4 < 60；
Nd5=1.922866, Vd5=20.882149 meet above-mentioned 1.90 < Nd5 < 1.95, the design of 17 < Vd5 < 25；
As shown in Figures 2 and 3, wherein Fig. 2 Fig. 3 be the present embodiment MTF (Modulation Transfer Function,
Modulation transfer function) value figure, the mtf value figure be based on table 1 in parameter, the measurement of the qualities such as resolution ratio that optical lens is most valued,
It defines mtf value and is necessarily greater than 0, and less than 1, in the art mtf value closer to 1, illustrate that the performance of camera lens is more excellent, that is, divide
Resolution is high；Its variable is spatial frequency, and spatial frequency is measured with that can show more fewer striplines in the range of a mm, list
Position is indicated with lp/mm；Fixed high frequency (such as 300lp/mm) curve represents resolution of lens characteristic, this curve is higher, camera lens
Resolution ratio is higher, and ordinate is mtf value.Abscissa can set image field center to the distance of measurement point, and camera lens, which is with optical axis, is
The symmetrical structure of the heart, center to the pixel qualitative change law of all directions be it is identical, due to the influence of the factors such as aberration, image field
In certain put it is remoter at a distance from image field center, mtf value is generally in downward trend.Therefore with image field center to image field edge
Distance is abscissa, can reflect the imaging quality of lens edge；In addition, in the position for deviateing image field center, by tangentially side
To sinusoidal grating of the lines with lines radially measured by mtf value be different；The lines of diameter will be parallel to
The MTF curve of generation is known as sagitta of arc curve, is designated as S (Sagittal), and the MTF curve that the lines for being parallel to tangent line generate is claimed
For meridian curve, it is designated as T (Meridional)；In this way, which MTF curve generally has two, i.e. S curve and T curve, Fig. 2, figure
In 3, MTF change curve when having multiple groups using the distance of image field center to image field edge as abscissa reflects that this lens system has
Have compared with high resolution.
Fig. 2-Fig. 6 is followed successively by a kind of ultra-thin fish eye lens of the present embodiment when operating distance is infinity in the first parsing
Figure, the second analysis diagram, curvature of field figure, distortion figure, relative illumination figure.
As shown in figure 4, for curve closer to y-axis, aberration rate is smaller in figure, meridianal curvature of field value is controlled in -0.08~0.04mm
In range, Sagittal field curvature value is controlled within -0.08~0.06mm range.As shown in figure 5, wherein the control of optical distortion rate exists
Within 0%~1% range.As shown in fig. 6, wherein relative illumination is greater than 50%.
The limitation that the technical solution of the utility model is not limited to the above specific embodiments, all skills according to the present utility model
The technology deformation that art scheme is made, each falls within the protection scope of the utility model.
Claims (9)
1. a kind of ultra-thin fish eye lens, the optical system of the camera lens along optical axis successively include: from object plane to image planes the first lens,
Second lens, diaphragm, the third lens, the 4th lens, the 5th lens；It is characterized in that, the first lens object plane side be convex surface,
Image planes side is concave surface；The second lens object plane side is convex surface, image planes side is plane；The third lens object plane side be concave surface,
Image planes side is convex surface；4th lens object plane side is convex surface, image planes side is convex surface；The 5th lens object plane side be concave surface,
Image planes side is convex surface；Wherein f1 is first focal length of lens, and f is system whole focal length, and meets following condition: -1.5 < (f1/f)
<-0.7。
2. ultra-thin fish eye lens according to claim 1, which is characterized in that the optical system of the camera lens also meets as follows
Condition:
(1) 1.65 < Nd1 < 1.70,40 < Vd1 < 60；
(2) 1.90 < Nd2 < 1.95,17 < Vd2 < 25；
(3) 1.70 < Nd3 < 1.90,40 < Vd3 < 60；
(4) 1.65 < Nd4 < 1.85,40 < Vd4 < 60；
(5) 1.90 < Nd5 < 1.95,17 < Vd5 < 25；
Wherein: Nd1 is the refractive index of the first lens, and Vd1 is the abbe number of the first lens；Nd2 is the refractive index of the second lens,
Vd2 is the abbe number of the second lens；Nd3 is the refractive index of the third lens, and Vd3 is the abbe number of the third lens；Nd4 is
The refractive index of four lens, Vd4 are the abbe number of the 4th lens；Nd5 is the refractive index of the 5th lens, and Vd5 is the 5th lens
Abbe number.
3. ultra-thin fish eye lens according to claim 1, which is characterized in that first power of lens is negative,
Focal length f1 is -2.83mm.
4. ultra-thin fish eye lens according to claim 1, which is characterized in that second power of lens is positive,
Focal length f2 is 9.08mm.
5. ultra-thin fish eye lens according to claim 1, which is characterized in that the focal power of the third lens is positive,
Focal length f3 is 5.77mm.
6. ultra-thin fish eye lens according to claim 1, which is characterized in that the 4th power of lens is positive,
Focal length f4 is 2.92mm.
7. ultra-thin fish eye lens according to claim 1, which is characterized in that the 5th power of lens is negative,
Focal length f5 is -4.67mm.
8. ultra-thin fish eye lens according to claim 1, which is characterized in that shown 4th lens and the 5th lens are one group
Balsaming lens.
9. ultra-thin fish eye lens according to claim 1, which is characterized in that be additionally provided between the 5th lens and image planes
Protect glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920013311.XU CN209167653U (en) | 2019-01-04 | 2019-01-04 | A kind of ultra-thin fish eye lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920013311.XU CN209167653U (en) | 2019-01-04 | 2019-01-04 | A kind of ultra-thin fish eye lens |
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| Publication Number | Publication Date |
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| CN209167653U true CN209167653U (en) | 2019-07-26 |
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ID=67328228
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|---|---|---|---|
| CN201920013311.XU Expired - Fee Related CN209167653U (en) | 2019-01-04 | 2019-01-04 | A kind of ultra-thin fish eye lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111538138A (en) * | 2020-07-09 | 2020-08-14 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| CN117233950A (en) * | 2023-11-13 | 2023-12-15 | 国药新光医疗科技有限公司 | Multispectral wide-angle endoscope lens assembly |
-
2019
- 2019-01-04 CN CN201920013311.XU patent/CN209167653U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111538138A (en) * | 2020-07-09 | 2020-08-14 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| CN117233950A (en) * | 2023-11-13 | 2023-12-15 | 国药新光医疗科技有限公司 | Multispectral wide-angle endoscope lens assembly |
| CN117233950B (en) * | 2023-11-13 | 2024-02-02 | 国药新光医疗科技有限公司 | Multispectral wide-angle endoscope lens assembly |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190726 Termination date: 20220104 |