CN104714292B - A kind of optical lens assembly - Google Patents
A kind of optical lens assembly Download PDFInfo
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- CN104714292B CN104714292B CN201510176435.6A CN201510176435A CN104714292B CN 104714292 B CN104714292 B CN 104714292B CN 201510176435 A CN201510176435 A CN 201510176435A CN 104714292 B CN104714292 B CN 104714292B
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- lens
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- optical lens
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Classifications
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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
- G02B13/0035—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 three lenses
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
Abstract
This application discloses a kind of optical lens assembly, included successively by the direction of thing side to image side along optical axis：The first lens with positive light coke, the second lens with positive light coke, the 3rd lens of negative power, optical filter and imaging surface, the optical lens assembly meet relational expression：0.8<TTL/F<1.8、‑2.5<F3/F<‑4.3、0.8<F2/F1<2.6, the application is by setting the position relationship between rational argument structure and eyeglass so that the optics total length of the optical lens assembly is less than 2.2mm, meets the miniaturization requirement of modern photography equipment.
Description
Technical field
The application is related to imaging device technical field, more specifically to a kind of optical lens assembly.
Background technology
In recent years, with scientific and technological continuous progress, the integrated level more and more higher of digital electric equipment, mobile phone, digital camera
Become more compact, frivolous, portable Deng photographic equipment, optical lens as optical module essential in photographic equipment,
Its size turns into one of key factor of overall dimension of influence photographic equipment, generally needs to control as far as possible when designing camera lens
The overall length of optical lens processed, to ensure the overall dimension of photographic equipment；It is simultaneously increasingly strong with the photographic equipment function such as mobile phone
Greatly, while photographic equipment compact is kept, the quality requirement more and more higher for the image that people shoot to photographic equipment,
This be accomplished by optical lens be designed to it is reasonably combined with the photographing element of high pixel in the market.And it is existing small-sized
Change phtographic lens, for reduction manufacturing cost, adopt based on two-piece type lens arrangement more, be not enough to amendment balance difference well, but
Configuring excessive eyeglass will cause camera lens total length to be difficult to reach small form factor requirements, can also increase manufacturing cost, therefore use three
How the lens system of eyeglass composition can reasonably set the parameter of three eyeglasses so that the light as the preferred scheme designed
The miniaturization requirement that component disclosure satisfy that photographic equipment is learned, as one of those skilled in the art's technical problem urgently to be resolved hurrily.
The content of the invention
In view of this, the application provides a kind of parameter by reasonably setting three eyeglasses to provide one kind, for energy
Enough meet the optical lens assembly that the miniaturization of photographic equipment is required.
To achieve these goals, it is proposed that scheme it is as follows：
A kind of optical lens assembly, is included successively along optical axis by the direction of thing side to image side：
Diaphragm with same central shaft, the first lens, the second lens, the 3rd lens, optical filter and imaging surface；
Wherein, first lens have positive focal power, and its image side surface is concave surface, and second lens also have positive
Focal power, its thing side is concave surface, and the 3rd lens have negative focal power,
The optical lens assembly meets following relational expression：0.8<TTL/F<1.8、-2.5<F3/F<-4.3、0.8<F2/F1
<2.6；
Wherein F is the total focal length of the optical lens assembly, and F1 is the focal length of first lens, and F2 is described second saturating
The focal length of mirror, F3 is the focal length of the 3rd lens, and TTL is the overall length of the optical lens assembly.
It is preferred that, the optical lens assembly also meets relational expression：
0.2<R1/R2<0.6、0.8<R3/R4<1.6、4<T12/T23<11；
The R1 is the radius of curvature of the first lens thing side surface, and R2 is the radius of curvature on the first lens image side surface, R3
For the radius of curvature of the second lens thing side surface, R4 is the radius of curvature on the second lens image side surface, and T12 is first lens
The distance between with the second lens, T23 is the distance between second lens and the 3rd lens.
It is preferred that, in the optical lens assembly, it is provided with the surface of the 3rd lens thing side off-axis for converging
The point of inflexion of field rays.
It is preferred that, the optical lens assembly also meets relational expression：
v1>50, v2>50；
The v1 is the abbe number of first lens, and v2 is the abbe number of second lens.
It is preferred that, the optical lens assembly also meets relational expression：
n1>1.5, n3>1.5；
N1 is the refractive index of first lens, and n3 is the refractive index of the 3rd lens.
A kind of optical lens assembly, is included successively along optical axis by the direction of thing side to image side：
Diaphragm with same central shaft, the first lens, the second lens, the 3rd lens, optical filter and imaging surface；
Wherein, first lens have positive focal power, and its image side surface is concave surface, and second lens also have positive
Focal power, its thing side is concave surface, and the 3rd lens have negative focal power,
The optical lens assembly meets following relational expression：0.8<TTL/F<1.8、-2.1<F3/F<-4.3、0.8<F2/F1
<2.6；
Wherein F is the total focal length of the optical lens assembly, and F1 is the focal length of first lens, and F2 is described second saturating
The focal length of mirror, F3 is the focal length of the 3rd lens, and TTL is the overall length of the optical lens assembly.
It is preferred that, the optical lens assembly also meets relational expression：
0.2<R1/R2<0.6、0.8<R3/R4<1.6、4<T12/T23<11；
The R1 is the radius of curvature of the first lens thing side surface, and R2 is the radius of curvature on the first lens image side surface, R3
For the radius of curvature of the second lens thing side surface, R4 is the radius of curvature on the second lens image side surface, and T12 is first lens
The distance between with the second lens, T23 is the distance between second lens and the 3rd lens.
It is preferred that, the optical lens assembly also meets relational expression：
v1>50, v2>50；
The v1 is the abbe number of first lens, and v2 is the abbe number of second lens.
It is preferred that, the optical lens assembly also meets relational expression：
n1>1.5, n3>1.5；
N1 is the refractive index of first lens, and n3 is the refractive index of the 3rd lens.
It is preferred that, in the optical lens assembly, the described first to the 3rd lens are using the non-of molding resin material
Spheric glass.
It can be seen from above-mentioned technical scheme that, the specific size of optical lens assembly disclosed in the present application meets constraint bar
Part：0.8<TTL/F<1.8、-2.5<F3/F<-4.3、0.8<F2/F1<2.6；Therefore by setting rational argument structure and mirror
Position relationship between piece so that the optics total length of the optical lens assembly is less than 2.2mm, meets the micro- of modern photography equipment
Typeization requirement.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is the structural representation for the optical lens assembly that the embodiment of the present application one is provided；
Fig. 2 is the curvature of field and distortion figure for the optical lens assembly that the embodiment of the present application one is provided；
Fig. 3 is the spherical aberration figure for the optical lens assembly that the embodiment of the present application one is provided；
Fig. 4 is the structural representation for the optical lens assembly that the embodiment of the present application two is provided；
Fig. 5 is the curvature of field and distortion figure for the optical lens assembly that the embodiment of the present application two is provided；
Fig. 6 is the spherical aberration figure for the optical lens assembly that the embodiment of the present application two is provided；
Fig. 7 is the structural representation for the optical lens assembly that the embodiment of the present application three is provided；
Fig. 8 is the curvature of field and distortion figure for the optical lens assembly that the embodiment of the present application three is provided；
Fig. 9 is the spherical aberration figure for the optical lens assembly that the embodiment of the present application three is provided.
Embodiment
This application discloses a kind of less optical lens of size using three aspherical lens combinations.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the structural representation of optical lens assembly disclosed in the embodiment of the present application one.
Referring to Fig. 1, optical lens assembly disclosed in the present application is set gradually along optical axis on the direction of thing side to image side
Have：
Diaphragm 1 with same central shaft, the first lens 2, the second lens 3, the 3rd lens 4, optical filter 5 and imaging surface 6；
Wherein, first lens 2 have positive focal power, and its image side surface is concave surface, and second lens 3 also have just
Focal power, its thing side is concave surface, and the 3rd lens 4 have negative focal power,
The optical lens assembly meets following relational expression：
0.8<TTL/F<1.8、-2.5<F3/F<-4.3、0.8<F2/F1<2.6；
Wherein, the F is the total focal length of optical lens assembly, and F1 is the focal length of first lens 2, and F2 is described second
The focal length of lens 3, F3 is the focal length of the 3rd lens 4, and TTL is the overall length of the optical lens assembly.
It is visible referring to optical lens assembly disclosed in the above embodiments of the present application, optics disclosed in the above embodiments of the present application
Lens assembly meets relational expression：0.8<TTL/F<1.8、-2.5<F3/F<-4.3、0.8<F2/F1<2.6；Therefore by setting
Rational position relationship between argument structure and eyeglass so that the optics total length of the optical lens assembly is less than 2.2mm, this
Art personnel could be aware that the optical length is less than 2.2mm optical lens assembly, meets modern photography equipment
Miniaturization requirement.
It is, of course, understood that the performance in order to be further ensured that the optical lens assembly, the optical lens group
Part also needs to meet following relational expression：
0.2<R1/R2<0.6、0.8<R3/R4<1.6、4<T12/T23<11；
Wherein, the R1 is the radius of curvature of the thing side surface of the first lens 2, and R2 is the curvature on the image side surface of the first lens 2
Radius, R3 is the radius of curvature of the thing side surface of the second lens 3, and R4 is the radius of curvature on the image side surface of the second lens 3, and T12 is institute
The distance between the first lens 2 and the second lens 3 are stated, T23 is the distance between described lens 3 of second lens 3 and the 3rd.
It is understood that the first lens 2, the second lens 3, the 3rd lens 4 in the above-mentioned any one embodiment of the application
Other parameters can according to the specific requirement of design carry out reasonable set, it is preferred that institute disclosed in the above embodiments of the present application
Stating the parameter of the first to the 3rd lens can also include：
v1>50, v2>50；
The v1 is the abbe number of first lens 2, and v2 is the abbe number of second lens 3.
It is appreciated of course that the imaging effect in order to be further ensured that the optical lens assembly, the application is also to institute
The refractive index for stating the first lens and the 3rd lens is defined, including：
n1>1.5, n3>1.5；
The n1 is the refractive index of first lens 2, and n3 is the refractive index of the 3rd lens 4.
It is understood that in the prior art, generally using the glass mould lens making optical lens assembly, but glass
Glass eyeglass is present because the problem of product yield is low caused by processing difficulties and cost is higher, being directed to this problem, the application
First lens 2, the second lens 3, the 3rd lens 4 disclosed in above-mentioned any one embodiment are more ripe using moulding process
The aspherical lens that resin material is made.
It is understood that the image quality in order to improve the optical lens assembly, the application is also by described
The three rationally designs of lens 4, further amendment has been carried out to the aberration of off-axis visual field.Specially：
The point of inflexion for converging off-axis field rays, the contrary flexure are provided with the surface of the thing side of 3rd lens 4
Point can effectively converge off-axis field rays, light is incided the angle on photo-sensitive cell and the default angle kissing of chip
Close, so as to reach the purpose of the aberration of further modified off-axis visual field.
Any one aspheric curve of the described first to the 3rd lens in the above-mentioned any one embodiment of the application is satisfied by public affairs
Formula：
Wherein, the z represents the Z coordinate value of lens surface each point, and r represents the Y-axis coordinate value of each point on lens surface, c
For the inverse of the radius of curvature R of lens surface, k is circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For order aspherical coefficients.
It is understood that certainly on the basis of above-mentioned condition is met, the described first to the 3rd aspheric curve it is specific
Parameter can be depending on the demand according to design, for example, this optical lens assembly for current high pixel taking pictures digital product
During design, the characteristics of ultra-thin large aperture wide-angle can be made it have.Its optics overall length is set smaller than 2.2mm, meets digital product
The requirement of miniaturization.Its aperture is set to 2.0, the design of the 2.0 super large aperture so that high pixel is taken pictures night of digital product
Bat ability is significantly increased, and certain image quality is ensured in the environment of dark；Its angle of visual field could be arranged to be not less than
78 degree, more than 78 degree of wide-angle design, can increase high pixel and takes pictures digital production by the intake of more scenery to photosurface imaging
The field range that product are shot.Understand for convenience, the application also fully discloses the aspheric of three kinds of the described first to the 3rd lens
The design parameter of curved surface, shown in following examples one, embodiment two and embodiment three：
Embodiment one：
In this example, the total focal length of the optical lens assembly is 1.64mm, and aperture is the 2.0, angle of visual field up to 79 degree；It is described
The thickness of optical filter 5 is 0.15mm, and referring to Fig. 1, the protective glass piece 7 of the optical lens assembly is arranged at along object space to image space
Between optical filter 5 and the imaging surface 6, the thickness of the protective glass piece is 0.4mm, and the center of first lens 2 is thick
Scope is spent between 0.296~0.415mm, and the center thickness scope of second lens 3 is between 0.216~0.315mm, institute
The center thickness scope of the 3rd lens 4 is stated between 0.205~0.356mm, meanwhile, the aspheric of the described first to the 3rd lens is bent
As shown in table 1, its structure chart is as shown in figure 1, the curvature of field and distortion figure are as shown in Fig. 2 spherical aberration figure such as Fig. 3 institutes for the design parameter in face
Show：
| First lens | Second lens | 3rd lens | ||||
| Face sequence number | 11 | 12 | 21 | 32 | 31 | 32 |
| R | 7.17E-01 | 1.92E+00 | -7.60E-01 | -5.46E-01 | 9.65E-01 | 5.79E-01 |
| k | -2.19E-02 | 1.84E+01 | 1.31E+00 | -2.05E-01 | -3.01E-02 | -4.11E+00 |
| α2 | 9.60E-02 | 1.34E-01 | 1.08E+00 | 7.03E-02 | -3.00E+00 | -1.38E+00 |
| α3 | 2.97E+00 | -1.85E+00 | -1.65E+01 | -3.94E-01 | 4.54E+00 | 2.55E+00 |
| α4 | -2.43E+01 | 4.78E+01 | 5.21E+01 | -2.91E-01 | 1.80E+00 | -2.91E+00 |
| α5 | 5.81E+01 | -3.25E+02 | 4.12E+02 | 2.45E+01 | -1.42E+01 | 1.53E+00 |
| α6 | 5.46E+02 | 4.07E+02 | -1.91E+03 | 1.73E+02 | 8.66E+00 | 6.29E-02 |
| α7 | -1.52E+03 | 6.16E+03 | 3.51E+03 | 2.27E+02 | 9.37E+00 | -5.46E-01 |
| α8 | -3.60E+03 | -2.22E+04 | -2.19E+03 | -1.40E+03 | -8.50E+00 | 1.39E-01 |
Table 1
Wherein, the face sequence number 11 represents that the thing side surface of the first lens, 12 represent the image side surface of the first lens, 21 tables
Show that the thing side surface of the second lens, 22 represent that the image side surface of the second lens, 31 represent that the thing side surface of the 3rd lens, 32 are represented
The image side surface of 3rd lens.
Embodiment two：
In this example, the total focal length of the optical lens assembly is 1.63mm, and aperture is the 2.0, angle of visual field up to 78 degree；It is described
The thickness of optical filter 5 is 0.21mm, and referring to Fig. 1, the protective glass piece 7 of the optical lens assembly is arranged at along object space to image space
Between optical filter 5 and the imaging surface 6, the thickness of the protective glass piece is 0.335mm, the center of first lens 2
Thickness is between 0.275~0.335mm, and the center thickness of second lens 3 is between 0.206~0.325mm, and the described 3rd
The center thickness of lens 4 is between 0.275~0.356mm, now, the specific ginseng of the aspheric curve of the described first to the 3rd lens
Number is as shown in table 2, and its structure chart is as shown in figure 4, the curvature of field and distortion figure are as shown in figure 5, spherical aberration figure is as shown in Figure 6：
| Eyeglass 1 | Eyeglass 2 | Eyeglass 3 | ||||
| Face sequence number | 11 | 12 | 21 | 22 | 31 | 32 |
| R | 7.35E-01 | 2.03E+00 | -7.79E-01 | -6.02E-01 | 1.23E+00 | 7.66E-01 |
| k | 1.19E+00 | 3.39E+00 | 1.65E+00 | -2.95E-01 | -3.57E+00 | -7.65E-01 |
| α2 | 8.82E-02 | 2.07E-01 | 9.23E-01 | -9.16E-01 | -2.63E+00 | -2.17E+00 |
| α3 | -1.46E+01 | -6.03E-01 | -1.39E+01 | 2.19E+00 | 4.95E+00 | 4.07E+00 |
| α4 | 2.44E+02 | 4.66E+01 | 3.62E+00 | -1.16E+01 | 1.22E+00 | -6.25E+00 |
| α5 | -2.16E+03 | -3.60E+02 | 6.17E+02 | 2.71E+01 | -1.49E+01 | 7.03E+00 |
| α6 | 8.21E+03 | -4.03E+02 | -1.61E+03 | 2.56E+02 | 8.76E+00 | -6.07E+00 |
| α7 | -3.66E+03 | 1.82E+04 | 1.63E+03 | 8.53E+02 | 1.19E+01 | 3.57E+00 |
| α8 | -3.87E+04 | -5.91E+04 | -2.03E+03 | -3.74E+03 | -9.92E+00 | -1.10E+00 |
Table 2
Embodiment three：
In this example, the total focal length of the optical lens assembly is 1.64mm, and aperture is the 2.0, angle of visual field up to 80 degree；It is described
The thickness of optical filter 5 is 0.21mm, and referring to Fig. 1, the protective glass piece 7 of the optical lens assembly is arranged at along object space to image space
Between optical filter 5 and the imaging surface 6, the thickness of the protective glass piece is 0.335mm, the center of first lens 2
Thickness is between 0.265~0.355mm, and the center thickness of second lens 3 is between 0.256~0.395mm, and the described 3rd
The center thickness of lens 4 is between 0.285~0.386mm, now, the specific ginseng of the aspheric curve of the described first to the 3rd lens
Number is as shown in table 3, and its structure chart is as shown in fig. 7, the curvature of field and distortion figure are as shown in figure 8, spherical aberration figure is as shown in Figure 9：
| Eyeglass 1 | Eyeglass 2 | Eyeglass 3 | ||||
| Face sequence number | 11 | 12 | 21 | 22 | 31 | 32 |
| R | 7.39E-01 | 2.08E+00 | -7.78E-01 | -5.89E-01 | 1.29E+00 | 7.65E-01 |
| k | 1.18E+00 | 3.13E+00 | 1.36E+00 | -3.36E-01 | -4.41E+00 | -7.85E-01 |
| α2 | 7.44E-02 | 1.98E-01 | 8.32E-01 | -8.46E-01 | -2.56E+00 | -2.18E+00 |
| α3 | -1.42E+01 | -2.58E-01 | -1.32E+01 | 2.37E+00 | 5.01E+00 | 4.11E+00 |
| α4 | 2.44E+02 | 4.62E+01 | 2.97E+00 | -1.12E+01 | 5.30E-01 | -6.24E+00 |
| α5 | -2.16E+03 | -3.58E+02 | 6.17E+02 | 2.84E+01 | -1.41E+01 | 6.88E+00 |
| α6 | 8.22E+03 | -3.75E+02 | -1.59E+03 | 2.58E+02 | 8.76E+00 | -6.00E+00 |
| α7 | -3.48E+03 | 1.83E+04 | 1.56E+03 | 8.54E+02 | 1.19E+01 | 3.73E+00 |
| α8 | -3.84E+04 | -5.84E+04 | -4.12E+03 | -3.79E+03 | -9.92E+00 | -1.23E+00 |
Table 3
The distortion of optical lens assembly disclosed in the above embodiments of the present application is less than 1%, and the curvature of field is less than 0.1mm, spherical aberration
Less than 10um, imaging distortion is small, and definition is high, and color is full, and stereovision is abundant it is understood that the application is also disclosed
A kind of optical lens assembly, compared to the optical lens assembly disclosed in the above embodiments of the present application, the present embodiment is public
In the optical module opened, the span of the F3/F is：-2.1<F3/F<-4.3.And the other technical characteristics in the present embodiment
Can mutually it be used for reference with the technical characteristic of the optical lens assembly in above-mentioned any one embodiment, then this is stated without tired.
It is understood that be directed to optical lens assembly disclosed in the above embodiments of the present application, the application is also with opening
A kind of concrete application of optical lens assembly, specifically, applying taking the photograph for the optical lens assembly disclosed herein as well is a kind of
Shadow equipment, the photographic equipment can include optical lens assembly disclosed in the above-mentioned any one embodiment of the application.Wherein, it is described
Photographic equipment can be specially that can carry out the electronic equipment of video or IMAQ above mobile phone, notebook and iPad etc..
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include be this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there is other identical element in the process including the key element, method, article or equipment.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (7)
1. a kind of optical lens assembly, it is characterised in that included successively by the direction of thing side to image side along optical axis：
Diaphragm with same central shaft, the first lens, the second lens, the 3rd lens, optical filter and imaging surface；
Wherein, first lens have positive focal power, and its image side surface is concave surface, and second lens also have positive light focus
Degree, its thing side is concave surface, and the 3rd lens have negative focal power,
The optical lens assembly meets following relational expression：0.8<TTL/F<1.8、-2.5>F3/F>-4.3、0.8<F2/F1<
2.6；
Wherein F is the total focal length of the optical lens assembly, and F1 is the focal length of first lens, and F2 is second lens
Focal length, F3 is the focal length of the 3rd lens, and TTL is the overall length of the optical lens assembly；
The surface of the 3rd lens thing side is provided with the point of inflexion for being used for converging off-axis field rays；
The optical lens assembly also meets relational expression：
0.2<R1/R2<0.6、0.8<R3/R4<1.6、4<T12/T23<11；
The R1 is the radius of curvature of the first lens thing side surface, and R2 is the radius of curvature on the first lens image side surface, and R3 is the
The radius of curvature of two lens thing side surfaces, R4 is the radius of curvature on the second lens image side surface, and T12 is first lens and the
The distance between two lens, T23 is the distance between second lens and the 3rd lens.
2. optical lens assembly according to claim 1, it is characterised in that the optical lens assembly also meets relation
Formula：
v1>50, v2>50；
The v1 is the abbe number of first lens, and v2 is the abbe number of second lens.
3. optical lens assembly according to claim 1, it is characterised in that the optical lens assembly also meets relation
Formula：
n1>1.5, n3>1.5；
N1 is the refractive index of first lens, and n3 is the refractive index of the 3rd lens.
4. a kind of optical lens assembly, it is characterised in that included successively by the direction of thing side to image side along optical axis：
Diaphragm with same central shaft, the first lens, the second lens, the 3rd lens, optical filter and imaging surface；
Wherein, first lens have positive focal power, and its image side surface is concave surface, and second lens also have positive light focus
Degree, its thing side is concave surface, and the 3rd lens have negative focal power,
The optical lens assembly meets following relational expression：0.8<TTL/F<1.8、-2.1>F3/F>-4.3、0.8<F2/F1<
2.6；
Wherein F is the total focal length of the optical lens assembly, and F1 is the focal length of first lens, and F2 is second lens
Focal length, F3 is the focal length of the 3rd lens, and TTL is the overall length of the optical lens assembly；
The surface of the 3rd lens thing side is provided with the point of inflexion for being used for converging off-axis field rays；
The optical lens assembly also meets relational expression：
0.2<R1/R2<0.6、0.8<R3/R4<1.6、4<T12/T23<11；
The R1 is the radius of curvature of the first lens thing side surface, and R2 is the radius of curvature on the first lens image side surface, and R3 is the
The radius of curvature of two lens thing side surfaces, R4 is the radius of curvature on the second lens image side surface, and T12 is first lens and the
The distance between two lens, T23 is the distance between second lens and the 3rd lens.
5. optical lens assembly according to claim 4, it is characterised in that the optical lens assembly also meets relation
Formula：
v1>50, v2>50；
The v1 is the abbe number of first lens, and v2 is the abbe number of second lens.
6. optical lens assembly according to claim 4, it is characterised in that the optical lens assembly also meets relation
Formula：
n1>1.5, n3>1.5；
N1 is the refractive index of first lens, and n3 is the refractive index of the 3rd lens.
7. optical lens assembly according to claim 4, it is characterised in that the described first to the 3rd lens are using tree
The aspherical lens of fat material shaping.
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