CN103513401A - Optical lens assembly - Google Patents
Optical lens assembly Download PDFInfo
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- CN103513401A CN103513401A CN201210212302.6A CN201210212302A CN103513401A CN 103513401 A CN103513401 A CN 103513401A CN 201210212302 A CN201210212302 A CN 201210212302A CN 103513401 A CN103513401 A CN 103513401A
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- lens
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- assembly
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Abstract
The present invention provides an optical lens assembly which comprises a lens set. The optical lens assembly is characterized in that: the lens set comprises the following components which are coaxial and are successively arranged from the object side to the image side: a first lens, a second lens, a third lens and a fourth lens; furthermore the lens set satisfies the following relationships: L/F>5.9, -1.2<f1/F<-0.9, Lh/F>1; wherein the focal length of the first lens is f1, the focal length of the lens set is F, the optical total length of the lens is L, and the optical back focal length of the lens is Lh. According to the optical lens assembly provided by the invention, a good imaging effect is obtained just through four lenses, and therefore the optical lens assembly has the following advantages: simple structure, smaller volume and cost reduction. Simultaneously the optical lens assembly of the invention has an imaging wave band which is wider than that of the prior product, and can perform near-infrared wave band imaging thereby obtaining better night vision effect.
Description
Technical field
The present invention relates to a kind of optical device, relate in particular to a kind of optical lens assembly.
Background technology
Flourish along with automobile industry, the security performance of automobile more and more comes into one's own.On automobile, be equipped with front view lens, make it to there is driving recording, the function such as lane shift early warning, the identification of pedestrian's obstacle become current trend.In vehicle front-viewing equipment, optical imaging lens is extremely important assembly, and the image quality of camera lens, environmental suitability have directly determined the performance of forward sight equipment, thereby the optical lens being provided in imaging device is had to very high requirement.
Produce both at home and abroad vehicle-mounted forward sight optical lens manufacturer, although can meet the index request of vehicle-mounted front view lens, exist complex structure, cost higher, without shortcomings such as night vision function (only to the following optical region imaging of 650nm).
Summary of the invention
The present invention is for solving the more complicated problem of existing vehicle-mounted optical lens structure, and a kind of simple in structure, optical lens assembly with good optical property is provided.
The invention provides a kind of optical lens assembly, comprise lens combination, described lens combination comprises coaxial and is arranged in order from object space to image space: first lens, the second lens, the 3rd lens and the 4th lens;
Described first lens is for having negative dioptric concave-concave non-spherical lens;
Described the second lens are to have the convex surface of positive diopter towards the convex-concave spherical lens of object space;
Described the 3rd lens are the biconvex non-spherical lens with positive diopter;
Described the 4th lens are to have the concave surface of positive diopter towards the concavo-convex non-spherical lens of object space;
Described lens combination meets the following conditions:
L/F?>5.9，
-1.2?<?f
1/F?<?-0.9，
L
h/F>1；
Wherein the focal length of first lens is f
1, the focal length of lens combination is F, and the optics overall length of camera lens is L, and after optics, Jiao is L
h.
Compared with prior art: the present invention only reaches good imaging effect with 4 eyeglasses, simple in structure, and small volume, has reduced cost; Simultaneously the present invention is wider than existing product optical imagery wave band, can be at near-infrared band blur-free imaging, thus there is better night vision effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical lens assembly of the present invention;
Fig. 2 is the MTF(optical transfer function of the embodiment of the present invention one optical lens assembly) schematic diagram;
Fig. 3 is the curvature of field figure of the embodiment of the present invention one optical lens assembly;
Fig. 4 is the distortion figure of the embodiment of the present invention one optical lens assembly;
Fig. 5 is the MTF(optical transfer function of the embodiment of the present invention two optical lens assemblies) schematic diagram;
Fig. 6 is the curvature of field figure of the embodiment of the present invention two optical lens assemblies;
Fig. 7 is the distortion figure of the embodiment of the present invention two optical lens assemblies.
Embodiment
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, the invention provides a kind of optical lens assembly, be applicable to vehicle-mounted optical lens, comprise the vehicle-mounted photoelectric intelligent systems such as vehicle driving record, lane shift early warning, the identification of pedestrian's obstacle.
Described optical lens assembly, comprises lens combination 1, and described lens combination 1 comprises coaxial and is arranged in order from object space to image space: first lens 11, the second lens 12, the 3rd lens 13 and the 4th lens 14;
Described first lens 11 is for having negative dioptric concave-concave non-spherical lens;
Described the second lens 12 are for to have the convex surface of positive diopter towards the convex-concave spherical lens of object space;
Described the 3rd lens 13 are for having the biconvex non-spherical lens of positive diopter;
Described the 4th lens 14 are for to have the concave surface of positive diopter towards the concavo-convex non-spherical lens of object space;
And described lens combination 1 meets the following conditions:
L/F?>5.9，
-1.2?<?f
1/F?<?-0.9，
L
h/F>1；
Wherein the focal length of first lens 11 is f
1, the focal length of lens combination 1 is F, and the optics overall length of camera lens is L, and after optics, Jiao is L
h.
In the present invention, L/F numerical value is larger, and optical lens becomes anti-long distance structure.So, can make the angular magnification of camera lens reduce on the one hand, the maximum key light line angle of imaging surface reduces, thereby camera lens and mating of imager chip are more prone to; On the other hand, L
hthe corresponding increase of/F, thus make rear lens focus become large, be convenient to later stage optical lens assembly focusing assembling.
Those skilled in the art pay great energy, through experiment many times, optimal design optical lens assembly, make its optical imagery wave band wider, can be at near-infrared band (650nm-780nm) blur-free imaging, thereby there is better night vision effect.
Further, described lens combination 1 meets the following conditions:
8<C
2/C
1<12，1.5<C
3/C
1<3，1.5<C
4/C
1<3；
Wherein the center thickness of first lens 11, the second lens 12, the 3rd lens 13, the 4th lens 14 is respectively C
1, C
2, C
3, C
4.
The center thickness of lens combination 1 each lens has rational proportion relation can ensure good image quality, and makes each lens thickness as far as possible little, contributes to shorten camera lens overall length; The present invention simultaneously reasonably arranges the maximum outside diameter of lens, can guarantee that lens combination 1 entire outer diameter is less.The center thickness of scioptics and the reasonable disposition of maximum outside diameter, effectively reduced the volume of camera lens.
More preferably, the center thickness C of first lens 11<sub TranNum="116">1</sub><2mm, the maximum outside diameter of first lens 11 is less than 7.5mm;
The center thickness C of the second lens 12<sub TranNum="118">2</sub><7mm, the maximum outside diameter of the second lens 12 is less than 7.5mm;
The center thickness C of the 3rd lens 13<sub TranNum="120">3</sub><2mm, the maximum outside diameter of the 3rd lens 13 is less than 7.5mm;
The center thickness C of the 4th lens 14<sub TranNum="122">4</sub><2mm, the maximum outside diameter of the 4th lens 14 is less than 7.5mm.
Described optical lens assembly also comprises diaphragm 2, between the 3rd lens 13 and the 4th lens 14.
Described diaphragm 2 is aperture diaphragm, and for controlling the luminous flux of scioptics, diaphragm 2 meets the following conditions: D<sub TranNum="125">1</sub><D<sub TranNum="126">2</sub>, wherein the distance of diaphragm 2 and the 3rd lens 13 is D<sub TranNum="127">1</sub>, the distance of diaphragm 2 and the 4th lens 14 is D<sub TranNum="128">2</sub>, in the present invention, the distance of diaphragm and lens surface is the distance along horizontal optical axis.。
Described optical lens assembly also comprises optical filter 3, be positioned at the 4th lens 14 rears, optical filter 3 is to have filter action sheet glass, for coordinate camera lens to visible ray to the good imaging of near infrared light wave band, optical filter to see through wavelength coverage relative set be that visible ray is near infrared light wave band (420-780nm).
Further, the refractive index of described lens combination 1 meets the following conditions: n<sub TranNum="131">1</sub><n<sub TranNum="132">2</sub>, n<sub TranNum="133">3</sub><n<sub TranNum="134">2</sub>, n<sub TranNum="135">4</sub><n<sub TranNum="136">2</sub>;
The refractive index of wherein said first lens 11, the second lens 12, the 3rd lens 13, the 4th lens 14 is respectively n
1, n
2, n
3, n
4.
Further, the Abbe coefficient of described lens combination 1 meets the following conditions: v
1>v
2, v
3>v
2, v
4>v
2;
The Abbe coefficient of wherein said first lens 11, the second lens 12, the 3rd lens 13, the 4th lens 14 is for being respectively v
1, v
2, v
3, v
4.
Further, described first lens 11 comprises first surface 110 and second surface 111, the second lens 12 comprise that the 3rd surface the 120 and the 4th surface 121, the three lens 13 comprise that the 5th surface the 130 and the 6th surface 131, the four lens 14 comprise the 140 and the 8th surface 141, the 7th surface; Lens combination 1 meets the following conditions:
-37<?R
1/R
2?<-32，
1?<?R
3/R
4?<?2，
-1.2<?R
5/R
6?<?-0.9，
18<?R
7/R
8?<22；
Wherein said first surface 110 to the radius-of-curvature on the 8th surface 141 is respectively R
1, R
2, R
3, R
4, R
5, R
6, R
7, R
8.
In the embodiment of the present invention, first surface 110, second surface 111, the 5th surface 130, the 6th surface 131, the 140 and the 8th surface 141, the 7th surface are aspheric surface, and meet following aspheric surface formula:
Wherein: z is starting point, the axial axial value of vertical light for take the intersection point of each aspheric surface and optical axis, and k is quadric surface coefficient, the curvature of centre that c is lens surface; R is the height of lens surface, a
1, a
2, a
3, a
4, a
5, a
6, a
7for asphericity coefficient.
Optical lens assembly provided by the invention, the second lens 12 are glass lens, first lens 11, the 3rd lens 13 and the 4th lens 14 are plastic cement lens.Mix and match by a slice glass lens, three plastic cement lens, has significantly reduced cost, alleviates camera lens weight.
Again by two embodiment, provide two parts of parameters, so that technician can more clearly know advantage of the present invention below.
Embodiment mono-
The present embodiment has proposed the correlation parameter of optical lens assembly, specific as follows:
Table 1 minute surface parameter
Table 2 asphericity coefficient parameter
K, a
1, a
2, a
3, a
4, a
5, a
6, a
7for asphericity coefficient.
Thickness in table 1 is the distance of this face to next face, and as in table 1, the thickness of first surface 110 is 0.55, and the center thickness that refers to first lens 11 is 0.55mm; The thickness of second surface 111 is 1.75, and the distance that refers to second surface 111 and the 3rd surface 120 is 1.75mm; The like.
In the present embodiment, F=3.0 in above-mentioned parameter, f
1=-3.17, f
2=17.16, f
3=3.09, f
4=6.44, L=18.2, L
h=3.34.Lens optical overall length L=18.2, L/F > 5.9, thus maximum key light line angle is less, is therefore more prone to mating of imager chip, and illuminance of image plane is higher.L
h/ F>1, rear Jiao is larger, is convenient to focusing assembling.
Fig. 2 is modulation transfer function (Modulation Transfer Function the is called for short MTF) curve map of the embodiment of the present invention one optical lens assembly, transverse axis representation space frequency in figure, unit: line is to every millimeter (lp/mm); The longitudinal axis represents the numerical value of modulation transfer function (MTF), and the numerical value of described MTF is used for evaluating the image quality of camera lens, and span is 0-1, and MTF curve is more high more directly represents that the image quality of camera lens is better, stronger to the reducing power of true picture.As can be seen from Figure 2, the MTF curve of each visual field meridian direction (T) and sagitta of arc direction (S) direction very close to, it shows: this camera lens is in each visual field, the imaging performance of meridian direction (T) and this both direction of sagitta of arc direction (S) has good consistance, can guarantee that lens assembly can blur-free imaging on whole imaging surface, and clear, ill-defined situation in the middle of there will not be.In full visual field, MTF is very concentrated, and the downtrending of MTF curve is straight, can guarantee preferably image quality.
The frequency v=1/ of ，Nei Qwest (2*6um)=83lp/mm place as can be known from Fig. 2, MTF is all greater than 0.3, therefore makes camera lens to this near-infrared band also better imaging.
Fig. 3 and Fig. 4 are respectively the curvature of field and the distortion figure of the embodiment of the present invention one optical lens assembly, and as can be seen from Figure 4 and Figure 5, the curvature of field is less than 0.1mm, and distortion, in 1% scope, has good optical property.
Embodiment bis-
Table 3 minute surface parameter
Table 4 asphericity coefficient parameter
K, a
1, a
2, a
3, a
4, a
5, a
6, a
7for asphericity coefficient.
Above-mentioned parameter draws F=2.99, f
1=-3.2, f
2=17.15, f
3=3.1, f
4=6.45, L=18, L
h=3.32.Lens optical overall length L=18, L/F > 5.9, thus maximum key light line angle is less, is therefore more prone to mating of imager chip, and illuminance of image plane is higher.L
h/ F>1, rear Jiao is larger, is convenient to focusing assembling.
Fig. 5 is modulation transfer function (Modulation Transfer Function the is called for short MTF) curve map of the optical lens assembly of the embodiment of the present invention two, transverse axis representation space frequency in figure, unit: line is to every millimeter (lp/mm); The longitudinal axis represents the numerical value of modulation transfer function (MTF), and the numerical value of described MTF is used for evaluating the image quality of camera lens, and span is 0-1, and MTF curve is more high more directly represents that the image quality of camera lens is better, stronger to the reducing power of true picture.As can be seen from Figure 7, the MTF curve of each visual field meridian direction (T) and sagitta of arc direction (S) direction very close to, it shows: this camera lens is in each visual field, the imaging performance of meridian direction (T) and this both direction of sagitta of arc direction (S) has good consistance, can guarantee that lens assembly can blur-free imaging on whole imaging surface, and clear, ill-defined situation in the middle of there will not be.In full visual field, MTF is very concentrated, and the downtrending of MTF curve is straight, can guarantee preferably image quality.
The frequency v=1/ of ，Nei Qwest (2*6um)=83lp/mm place as can be known from Fig. 5, MTF is all greater than 0.3, therefore makes camera lens to this near-infrared band also better imaging.
Fig. 6 and Fig. 7 are respectively the curvature of field and the distortion figure of the embodiment of the present invention two optical lens assemblies, and as can be seen from Figures 6 and 7, the curvature of field is less than 0.1mm, and distortion, in 1% scope, has good optical property.
In sum, optical lens assembly provided by the invention comprises the lens set that first lens, the second lens, the 3rd lens and the 4th lens form, and its structure, arrangement mode configuration rationally, can effectively reduce camera lens volume and obtain higher image quality;
Simultaneously the present invention is wider than existing product optical imagery wave band, and the optics of camera lens is arrived near infrared region by band extension, can be at near-infrared band blur-free imaging, thus there is better night vision effect.
The present invention, by the mix and match of a slice glass lens, three plastic cement lens, has significantly reduced cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an optical lens assembly, comprises lens combination, it is characterized in that, described lens combination comprises coaxial and is arranged in order from object space to image space: first lens, the second lens, the 3rd lens and the 4th lens;
Described first lens is for having negative dioptric concave-concave non-spherical lens;
Described the second lens are to have the convex surface of positive diopter towards the convex-concave spherical lens of object space;
Described the 3rd lens are the biconvex non-spherical lens with positive diopter;
Described the 4th lens are to have the concave surface of positive diopter towards the concavo-convex non-spherical lens of object space;
And described lens combination meets the following conditions:
L/F?>5.9，
-1.2?<?f
1/F?<?-0.9，
L
h/F>1；
Wherein the focal length of first lens is f
1, the focal length of lens combination is F, and the optics overall length of camera lens is L, and after optics, Jiao is L
h.
2. optical lens assembly as claimed in claim 1, is characterized in that, described lens combination meets the following conditions:
8<C
2/C
1<12，1.5<C
3/C
1<3，1.5<C
4/C
1<3；
Wherein the center thickness of first lens, the second lens, the 3rd lens, the 4th lens is respectively C
1, C
2, C
3, C
4.
3. optical lens assembly as claimed in claim 1, is characterized in that, also comprises diaphragm, and described diaphragm is between the 3rd lens and the 4th lens.
4. optical lens assembly as claimed in claim 3, is characterized in that, described diaphragm meets the following conditions:
D
1>D
2
Wherein the distance of diaphragm and the 3rd lens is D
1, the distance of diaphragm and the 4th lens is D
2.
5. optical lens assembly as claimed in claim 1, is characterized in that, also comprises optical filter, and described optical filter is positioned at the 4th lens towards a side of image space.
6. optical lens assembly as claimed in claim 5, is characterized in that, the wavelength coverage that sees through of described optical filter is 420-780nm.
7. optical lens assembly as claimed in claim 1, is characterized in that, the refractive index of described lens combination meets the following conditions:
n
1<n
2，n
3<n
2，n
4<n
2；
The refractive index of wherein said first lens, the second lens, the 3rd lens, the 4th lens is respectively n
1, n
2, n
3, n
4.
8. optical lens assembly as claimed in claim 1, is characterized in that, the Abbe coefficient of described lens combination meets the following conditions:
v
1>v
2、v
3>v
2、v
4>v
2；
The Abbe coefficient of wherein said first lens, the second lens, the 3rd lens, the 4th lens is for being respectively v
1, v
2, v
3, v
4.
9. optical lens assembly as claimed in claim 1, it is characterized in that, described first lens comprises first surface and second surface, and the second lens comprise the 3rd surface and the 4th surface, the 3rd lens comprise the 5th surface and the 6th surface, and the 4th lens comprise the 7th surface and the 8th surface; Described lens combination meets the following conditions:
-37<?R
1/R
2?<-32，
1?<?R
3/R
4?<?2，
-1.2<?R
5/R
6?<?-0.9，
18<?R
7/R
8?<22；
The radius-of-curvature on wherein said first surface to the eight surfaces is respectively R
1, R
2, R
3, R
4, R
5, R
6, R
7, R
8.
10. optical lens assembly as claimed in claim 1, is characterized in that, described the second lens are glass lens, and described first lens, the 3rd lens and the 4th lens are plastic cement lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210212302.6A CN103513401B (en) | 2012-06-26 | 2012-06-26 | A kind of optical lens assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210212302.6A CN103513401B (en) | 2012-06-26 | 2012-06-26 | A kind of optical lens assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103513401A true CN103513401A (en) | 2014-01-15 |
| CN103513401B CN103513401B (en) | 2016-01-20 |
Family
ID=49896394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210212302.6A Active CN103513401B (en) | 2012-06-26 | 2012-06-26 | A kind of optical lens assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103513401B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761736A (en) * | 2018-07-16 | 2018-11-06 | 北京未来橙网络科技有限公司 | Light channel structure |
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|---|---|---|---|---|
| JP2005300858A (en) * | 2004-04-09 | 2005-10-27 | Tokai Univ | Zoom lens |
| JP2007047309A (en) * | 2004-10-19 | 2007-02-22 | Enplas Corp | Imaging lens |
| JP2008139786A (en) * | 2006-12-05 | 2008-06-19 | Largan Precision Co Ltd | Photographic lens |
| CN101285927A (en) * | 2007-04-09 | 2008-10-15 | 比亚迪股份有限公司 | Optical lens |
| CN102043229A (en) * | 2009-10-15 | 2011-05-04 | 扬明光学股份有限公司 | Prime lens |
-
2012
- 2012-06-26 CN CN201210212302.6A patent/CN103513401B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005300858A (en) * | 2004-04-09 | 2005-10-27 | Tokai Univ | Zoom lens |
| JP2007047309A (en) * | 2004-10-19 | 2007-02-22 | Enplas Corp | Imaging lens |
| JP2008139786A (en) * | 2006-12-05 | 2008-06-19 | Largan Precision Co Ltd | Photographic lens |
| CN101285927A (en) * | 2007-04-09 | 2008-10-15 | 比亚迪股份有限公司 | Optical lens |
| CN102043229A (en) * | 2009-10-15 | 2011-05-04 | 扬明光学股份有限公司 | Prime lens |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761736A (en) * | 2018-07-16 | 2018-11-06 | 北京未来橙网络科技有限公司 | Light channel structure |
| CN108761736B (en) * | 2018-07-16 | 2023-08-29 | 北京未来橙网络科技有限公司 | Light path structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103513401B (en) | 2016-01-20 |
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Address after: 518119 Guangdong province Shenzhen City Dapeng new Kwai town Yanan Road No. 1 building experimental Byd Co Patentee after: Shenzhen helitai photoelectric Co., Ltd Address before: 518119 Guangdong province Shenzhen City Dapeng new Kwai town Yanan Road No. 1 building experimental Byd Co Patentee before: SHENZHEN BYD ELECTRONIC COMPONENT Co.,Ltd. |