CN110456486A - A kind of optical imaging lens - Google Patents
A kind of optical imaging lens Download PDFInfo
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- CN110456486A CN110456486A CN201910850796.2A CN201910850796A CN110456486A CN 110456486 A CN110456486 A CN 110456486A CN 201910850796 A CN201910850796 A CN 201910850796A CN 110456486 A CN110456486 A CN 110456486A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 35
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000003384 imaging method Methods 0.000 claims description 28
- 238000009738 saturating Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000005499 meniscus Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 16
- 238000005286 illumination Methods 0.000 description 12
- 230000004075 alteration Effects 0.000 description 8
- 238000012546 transfer Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000004304 visual acuity Effects 0.000 description 4
- 230000004438 eyesight Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
-
- 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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Optics & Photonics (AREA)
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Abstract
The present invention relates to lens technology field, a kind of particularly optical imaging lens, the invention discloses a kind of optical imaging lens, along an optical axis successively include the first lens, the second lens, the third lens and the 4th lens from object side to image side；First lens are the meniscus for having negative refractive index；Second lens are the meniscus for having positive refractive index；The third lens are the concave-convex lens for having negative refractive index, and the object side of the third lens and image side surface are aspherical；4th lens have positive refractive index, and object side is convex surface, and the object side of the 4th lens and image side surface are aspherical；The third lens and the 4th lens are all made of plastic material and are made.The present invention have the advantages that the total length of optics, at low cost, aperture is big, it is low distortion, nearly object distance use when have high resolution.
Description
Technical field
The invention belongs to lens technology fields, more particularly to a kind of optical imaging lens.
Background technique
With the continuous progress of technology, in recent years, optical imaging lens are also grown rapidly, and are widely used in
The every field such as smart phone, tablet computer, video conference, safety monitoring, vehicle-mounted monitoring, therefore, for optical imaging lens
Requirement it is also higher and higher.But DMS (driver's monitoring system) monitoring camera currently on the market, the lens numbers used compared with
More, overall length is longer, higher cost；Optical distortion is larger, and imaging distortion is serious；Aperture is smaller, and effect is imaged under relatively dark situation
Fruit is bad；Optical transfer function is managed wait improve when nearly object distance use, and resolution is low；And it is only applicable to more than 800 nanometers close red
UV light, when imaging, can reflect the near infrared light of LED light, influence Driver Vision, be unable to satisfy consumer and increasingly improved
Requirement.
Summary of the invention
The purpose of the present invention is to provide a kind of optical imaging lens to solve above-mentioned technical problem.
To achieve the above object, the technical solution adopted by the present invention are as follows: a kind of optical imaging lens, from object side to image side edge
One optical axis successively includes the first lens, the second lens, the third lens and the 4th lens；First lens to the 4th lens respectively wrap
One is included towards object side and the object side for passing through imaging ray and one towards image side and the image side surface that passes through imaging ray；
First lens have negative refractive index, and the object side of first lens is convex surface, and the image side surface of first lens is recessed
Face；
Second lens have positive refractive index, and the object side of second lens is convex surface, and the image side surface of second lens is recessed
Face；
The third lens have negative refractive index, and the object side of the third lens is concave surface, and the image side surface of the third lens is convex
Face, the object side of the third lens and image side surface are aspherical；
4th lens have positive refractive index, and the object side of the 4th lens is convex surface, the object side of the 4th lens and picture
Side is aspherical；
The third lens and the 4th lens are all made of plastic material and are made；
There are the optical imaging lens lens of refractive index there was only above-mentioned four.
It further, further include diaphragm, which is arranged between the second lens and the third lens.
Further, which also meets: vd1 > 70, wherein vd1 is dispersion of first lens in d line
Coefficient.
Further, which also meets: nd2 > 1.9, wherein nd2 is refraction of second lens in d line
Rate.
Further, which also meets: f2/f3 < 0.3, wherein f2 and f3 be respectively second lens and
The focal length of the third lens.
Further, which also meets: 1.6 < nd3 < 1.65,20 < vd3 < 25；1.6 < nd4 < 1.65,20 <
Vd4 < 25, wherein nd3 and nd4 is respectively the refractive index of the third lens and the 4th lens in d line, and vd3 and vd4 are respectively should
The abbe number of the third lens and the 4th lens in d line.
Further, which also meets: TTL < 11mm, wherein TTL is that the object side of first lens is arrived
Distance of one imaging surface on optical axis.
Further, the image side surface of the 4th lens is concave surface or convex surface.
Advantageous effects of the invention:
The present invention has lens numbers less, is only with four lens, and by accordingly being designed each lens
Overall length of uniting is shorter, at low cost；Aperture is larger, guarantees the imaging quality that can also have stable under darker environment；Optical distortion compared with
It is small, it ensure that the effect of imaging；Optical transfer function is managed preferably when nearly object distance uses, and resolution is high；And it is suitable for more than 900
The advantages of near infrared light of nanometer, when imaging, will not reflect the near infrared light of LED light and influence Driver Vision.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the structural schematic diagram of the embodiment of the present invention one；
The MTF figure that Fig. 2 is the infrared 920-960nm of the embodiment of the present invention one；
Fig. 3 is defocusing curve figure of the infrared 920-960nm in 60lp/mm of the embodiment of the present invention one；
Fig. 4 is the curvature of field and distortion schematic diagram of the embodiment of the present invention one；
Fig. 5 is the longitudinal aberration diagram schematic diagram of the embodiment of the present invention one；
Fig. 6 is the relative illumination curve graph of the infrared 960nm of the embodiment of the present invention one；
Fig. 7 is the structural schematic diagram of the embodiment of the present invention two；
The MTF figure that Fig. 8 is the infrared 920-960nm of the embodiment of the present invention two；
Fig. 9 is defocusing curve figure of the infrared 920-960nm in 60lp/mm of the embodiment of the present invention two；
Figure 10 is the curvature of field and distortion schematic diagram of the embodiment of the present invention two；
Figure 11 is the longitudinal aberration diagram schematic diagram of the embodiment of the present invention two；
Figure 12 is the relative illumination curve graph of the infrared 960nm of the embodiment of the present invention two；
Figure 13 is the structural schematic diagram of the embodiment of the present invention three；
The MTF figure that Figure 14 is the infrared 920-960nm of the embodiment of the present invention three；
Figure 15 is defocusing curve figure of the infrared 920-960nm in 60lp/mm of the embodiment of the present invention three；
Figure 16 is the curvature of field and distortion schematic diagram of the embodiment of the present invention three；
Figure 17 is the longitudinal aberration diagram schematic diagram of the embodiment of the present invention three；
Figure 18 is the relative illumination curve graph of the infrared 960nm of the embodiment of the present invention three；
Figure 19 is the structural schematic diagram of the embodiment of the present invention four；
The MTF figure that Figure 20 is the infrared 905-945nm of the embodiment of the present invention four；
Figure 21 is defocusing curve figure of the infrared 905-945nm in 60lp/mm of the embodiment of the present invention four；
Figure 22 is the curvature of field and distortion schematic diagram of the embodiment of the present invention four；
Figure 23 is the longitudinal aberration diagram schematic diagram of the embodiment of the present invention four；
Figure 24 is the relative illumination curve graph of the infrared 945nm of the embodiment of the present invention four.
Specific embodiment
To further illustrate that each embodiment, the present invention are provided with attached drawing.These attached drawings are that the invention discloses one of content
Point, mainly to illustrate embodiment, and the associated description of specification can be cooperated to explain the operation principles of embodiment.Cooperation ginseng
These contents are examined, those of ordinary skill in the art will be understood that other possible embodiments and advantages of the present invention.In figure
Component be not necessarily to scale, and similar component symbol is conventionally used to indicate similar component.
Now in conjunction with the drawings and specific embodiments, the present invention is further described.
Described " lens have positive refractive index (or negative refractive index) ", refers to the lens with first-order theory theoretical calculation
Paraxial refractive index out is positive (or being negative).Described " the object sides (or image side surface) of lens " are defined as imaging ray and pass through
The particular range of lens surface.The face shape bumps judgement of lens can pass through according to the judgment mode of skill usual in the field
The sign of radius of curvature (being abbreviated as R value) judges the bumps of lens face shape deflection.R value common can be used in optical design software
In, such as Zemax or CodeV.R value is also common in the lens data sheet (lens data sheet) of optical design software.With
For object side, when R value be timing, be determined as object side be convex surface；When R value is negative, determine that object side is concave surface.Conversely,
For image side surface, when R value is timing, judgement image side surface is concave surface；When R value is negative, determine that image side surface is convex surface.
The invention discloses a kind of optical imaging lens, along an optical axis successively include the first lens, from object side to image side
Two lens, the third lens and the 4th lens；First lens respectively include one towards object side to the 4th lens and make imaging ray
By object side and one towards image side and the image side surface that passes through imaging ray.
First lens have negative refractive index, and the object side of first lens is convex surface, and the image side surface of first lens is recessed
Face；Second lens have positive refractive index, and the object side of second lens is convex surface, and the image side surface of second lens is concave surface；It should
The third lens have negative refractive index, and the object side of the third lens is concave surface, and the image side surface of the third lens is convex surface, and the third is saturating
The object side of mirror and image side surface are aspherical；4th lens have positive refractive index, and the object side of the 4th lens is convex surface, should
The object side of 4th lens and image side surface are aspherical；The third lens and the 4th lens are all made of plastic material and are made.
The third lens and the 4th lens are all made of plastic aspheric lens, and plastic material is lower with respect to glass material price,
And be easier to process, further decrease the cost of camera lens；Using aspherical, color difference can be advanced optimized, and optimize
Distortion, keeps lens imaging deformation small.
There are the optical imaging lens lens of refractive index there was only above-mentioned four.The present invention has lens numbers less, is
Overall length of uniting is shorter, at low cost；Aperture is larger, guarantees the imaging quality that can also have stable under darker environment；Optical distortion compared with
It is small, it ensure that the effect of imaging；Optical transfer function is managed preferably when nearly object distance (0.65m) uses, and resolution is high；And it is suitable for
The advantages of more than 900 nanometers of near infrared light, when imaging, will not reflect the near infrared light of LED light and influence Driver Vision.
Preferably, the image side surface of the 4th lens is concave surface or convex surface, avoids generating ghost image with camera screening glass.
It preferably, further include diaphragm, which is arranged between the second lens and the third lens, makes the optical imaging lens
Structure it is more symmetrical.
Preferably, which also meets: vd1 > 70, wherein vd1 is dispersion system of first lens in d line
Number, can reduce the color difference of imaging.
Preferably, which also meets: nd2 > 1.9, wherein nd2 is refraction of second lens in d line
Rate, can be relatively good optimization the optical imaging lens structure.
Preferably, which also meets: f2/f3 < 0.3, wherein f2 and f3 is respectively second lens and
The focal length of three lens carries out temperature-compensating, reduces temperature drift.
Preferably, which also meets: 1.6 < nd3 < 1.65,20 < vd3 < 25；1.6 < nd4 < 1.65,20 <
Vd4 < 25, wherein nd3 and nd4 is respectively the refractive index of the third lens and the 4th lens in d line, and vd3 and vd4 are respectively should
The abbe number of the third lens and the 4th lens in d line, it is easy to accomplish, reduce cost.
Preferably, which also meets: TTL < 11mm, wherein TTL is the object side of first lens to one
Distance of the imaging surface on optical axis reduces the system overall length of the optical imaging lens.
Optical imaging lens of the invention will be described in detail with specific embodiment below.
Embodiment one
It along an optical axis I successively include the first lens from object side A1 to image side A2 as shown in Figure 1, a kind of optical imaging lens
1, the second lens 2, diaphragm 5, the third lens 3, the 4th lens 4, protection glass 6 and imaging surface 7；First lens 1 to the 4th are saturating
Mirror 4 respectively includes one towards object side A1 and the object side for passing through imaging ray and one towards image side A2 and keeps imaging ray logical
The image side surface crossed；
First lens 1 have negative refractive index, and the object side 11 of first lens 1 is convex surface, the image side surface of first lens 1
12 be concave surface.
Second lens 2 have positive refractive index, and the object side 21 of second lens 2 is convex surface, the image side surface of second lens 2
22 be concave surface.
The third lens 3 have negative refractive index, and the object side 31 of the third lens 3 is concave surface, the image side surface of the third lens 3
32 be convex surface, and the object side 31 of the third lens 3 and image side surface 32 are aspherical.
4th lens 4 have positive refractive index, and the object side 41 of the 4th lens 4 is convex surface, the image side surface of the 4th lens 4
42 be concave surface, and the object side 41 of the 4th lens 4 and image side surface 42 are aspherical.
The third lens 3 and the 4th lens 4 are all made of plastic material and are made.
In this specific embodiment, the first lens 1 and the second lens 2 are made of glass material, and but it is not limited to this.
In other embodiments, the image side surface 42 of the 4th lens 4 is also possible to convex surface or plane.
The detailed optical data of this specific embodiment are as shown in table 1-1.
The detailed optical data of table 1-1 embodiment one
In this specific embodiment, 41 He of object side of the object side 31 of the third lens 3 and image side surface 32 and the 4th lens 4
Image side surface 42 is defined according to following aspheric curve formula:
Wherein:
Z: (point for being y apart from optical axis on aspherical and is tangential on cutting for vertex on aspherical optical axis for aspherical depth
Face, vertical range between the two)；
C: the curvature (the vertex curvature) of aspheric vertex of surface；
K: conical surface coefficient (Conic Constant)；
Radial distance (radial distance)；
rn: normalization radius (normalizationradius (NRADIUS))；
U:r/rn；
am: m rank QconCoefficient (is the mth Qconcoefficient)；
Qm con: m rank QconMultinomial (the mth Qconpolynomial)；
Each aspherical parameter detailed data please refers to following table:
| Surface | 31 | 32 | 41 | 42 |
| K= | -2.3632E+00 | -1.1991E+00 | -2.5731E+00 | 2.1468E+01 |
| a4= | -7.1677E-02 | 9.9805E-03 | -7.3905E-04 | -1.0836E-02 |
| a6= | 1.3829E-02 | -4.8091E-03 | 2.8474E-04 | 2.1255E-03 |
| a8= | 1.8199E-02 | 4.2335E-03 | 3.6428E-05 | -1.5652E-04 |
| a10= | -1.7603E-02 | -9.5164E-04 | -8.5694E-06 | -2.2227E-05 |
| a12= | 6.8344E-03 | 1.2613E-04 | 8.4637E-07 | 5.4592E-06 |
| a14= | -1.0633E-03 | -1.3207E-05 | -3.2701E-08 | -2.8460E-07 |
The MTF transfer curve figure of this specific embodiment is detailed in Fig. 2, it can be seen that resolving power is good, high resolution, in sky
Between frequency 120lp/mm when, the mtf value of full angle is all larger than 0.4, good imaging quality；Defocusing curve figure is detailed in Fig. 3, it can be seen that
Defocus is small；The curvature of field and distortion figure are detailed in (A) and (B) of Fig. 4, it can be seen that distortion is small, and optical distortion is less than 9%；Longitudinal spherical aberration
Figure is detailed in Fig. 5, it can be seen that color difference is small, and within the scope of wavelength error, color difference is less than ± 0.04mm；Relative illumination figure is detailed in Fig. 6,
It can be seen that relative illumination is greater than 70%.
In this specific embodiment, the focal length f=5.45mm of optical imaging lens；F-number FNO=2.2；TTL=
10.63mm；Working substance is away from for 0.65m.
Embodiment two
As shown in fig. 7, the present embodiment is identical as the face type bumps and refractive index of each lens of embodiment one, only each lens
Radius of curvature, the optical parameter difference of lens thickness, lens asphericity coefficient and system focal length on surface.
The detailed optical data of this specific embodiment are as shown in table 2-1.
The detailed optical data of table 2-1 embodiment two
| Surface | Bore (mm) | Radius of curvature (mm) | Thickness (mm) | Material | Refractive index | Abbe number | Focal length (mm) | |
| - | Object plane shot | 768.421 | Infinity | 650.000 | ||||
| 11 | First lens | 5.025 | 12.363 | 0.470 | H-QK3L | 1.487 | 70.420 | -8.770 |
| 12 | 4.127 | 3.102 | 0.783 | |||||
| 21 | Second lens | 3.785 | 3.166 | 1.261 | H-ZLAF75A | 1.904 | 31.318 | 4.332 |
| 22 | 3.105 | 15.411 | 0.466 | |||||
| 5 | Diaphragm | 2.328 | Infinity | 2.015 | ||||
| 31 | The third lens | 3.067 | -1.095 | 0.500 | EP6000 | 1.640 | 23.529 | -15.993 |
| 32 | 3.630 | -1.446 | 0.130 | |||||
| 41 | 4th lens | 5.865 | 3.620 | 2.425 | EP6000 | 1.640 | 23.529 | 6.667 |
| 42 | 6.497 | 22.382 | 0.949 | |||||
| 6 | Protect glass | 6.265 | Infinity | 0.445 | H-K9L | 1.517 | 64.212 | Infinity |
| - | 6.218 | Infinity | 1.017 | |||||
| 7 | Imaging surface | 6.114 | Infinity |
Each aspherical parameter detailed data of this specific embodiment please refers to following table:
The MTF transfer curve figure of this specific embodiment is detailed in Fig. 8, it can be seen that resolving power is good, high resolution, in sky
Between frequency 120lp/mm when, the mtf value of full angle is all larger than 0.4, good imaging quality；Defocusing curve figure is detailed in Fig. 9, it can be seen that
Defocus is small；The curvature of field and distortion figure are detailed in (A) and (B) of Figure 10, it can be seen that distortion is small, and optical distortion is less than 9%；Longitudinal spherical aberration
Figure is detailed in Figure 11, it can be seen that color difference is small, and within the scope of wavelength error, color difference is less than ± 0.04mm；Relative illumination figure is detailed in figure
12, it can be seen that relative illumination is greater than 70%.
In this specific embodiment, the focal length f=5.55mm of optical imaging lens；F-number FNO=2.2；TTL=
10.45mm；Working substance is away from for 0.65m.
Embodiment three
As shown in figure 13, the present embodiment is roughly the same with the face type bumps and refractive index of each lens of embodiment one, only
The image side surface of 4th lens 4 is convex surface, furthermore the radius of curvature of each lens surface, lens thickness, lens asphericity coefficient and is
The optical parameter of system focal length is also different.
The detailed optical data of this specific embodiment are as shown in table 3-1.
The detailed optical data of table 3-1 embodiment three
Each aspherical parameter detailed data of this specific embodiment please refers to following table:
| Surface | 31 | 32 | 41 | 42 |
| K= | -2.2086E+00 | -1.5512E+00 | -1.3984E+01 | 9.4235E+01 |
| a4= | -8.3301E-02 | -7.2285E-03 | -6.4244E-05 | -8.6349E-03 |
| a6= | 1.3222E-03 | -9.4361E-03 | 2.0053E-04 | 1.0059E-03 |
| a8= | 3.5085E-02 | 1.0489E-02 | -7.8774E-06 | -6.2597E-05 |
| a10= | -2.1947E-02 | -2.8663E-03 | -2.0437E-06 | -3.1053E-06 |
| a12= | 3.3377E-03 | 5.7721E-04 | 2.7184E-07 | 5.1504E-07 |
| a14= | 1.7370E-03 | -1.0280E-04 | 4.5158E-08 | 6.2155E-08 |
The MTF transfer curve figure of this specific embodiment is detailed in Figure 14, it can be seen that resolving power is good, high resolution, In
When spatial frequency 120lp/mm, the mtf value of full angle is all larger than 0.4, good imaging quality；Defocusing curve figure is detailed in Figure 15, can be with
Find out that defocus is small；The curvature of field and distortion figure are detailed in (A) and (B) of Figure 16, it can be seen that distortion is small, and optical distortion is less than 9%；It is longitudinal
Spherical aberration figure is detailed in Figure 17, it can be seen that color difference is small, and within the scope of wavelength error, color difference is less than ± 0.04mm；Relative illumination figure is detailed
See Figure 18, it can be seen that relative illumination is greater than 70%.
In this specific embodiment, the focal length f=5.30mm of optical imaging lens；F-number FNO=2.2；TTL=
10.52mm；Working substance is away from for 0.65m.
Example IV
As shown in figure 19, the present embodiment is roughly the same with the face type bumps and refractive index of each lens of embodiment one, only
The image side surface of 4th lens 4 is convex surface, furthermore the radius of curvature of each lens surface, lens thickness, lens asphericity coefficient and is
The optical parameter of system focal length is also different.
The detailed optical data of this specific embodiment are as shown in table 4-1.
The detailed optical data of table 4-1 example IV
Each aspherical parameter detailed data of this specific embodiment please refers to following table:
| Surface | 31 | 32 | 41 | 42 |
| K= | -2.1176E+00 | -1.2504E+00 | -1.7592E+01 | 7.1739E+01 |
| a4= | -7.2272E-02 | -2.7989E-03 | 5.9125E-04 | -1.0162E-02 |
| a6= | -2.5808E-03 | -7.0733E-03 | 1.5696E-04 | 1.1277E-03 |
| a8= | 2.2237E-02 | 7.3464E-03 | -2.6805E-05 | -7.2695E-05 |
| a10= | -1.2522E-02 | -1.7373E-03 | -2.5293E-06 | -4.2195E-06 |
| a12= | 3.0538E-03 | 3.9117E-04 | 5.3431E-07 | 6.0749E-07 |
| a14= | 3.5183E-04 | -7.9660E-05 | 8.2179E-08 | 7.6068E-08 |
The MTF transfer curve figure of this specific embodiment is detailed in Figure 20, it can be seen that resolving power is good, high resolution, In
When spatial frequency 120lp/mm, the mtf value of full angle is all larger than 0.4, good imaging quality；Defocusing curve figure is detailed in Figure 21, can be with
Find out that defocus is small；The curvature of field and distortion figure are detailed in (A) and (B) of Figure 22, it can be seen that distortion is small, and optical distortion is less than 9%；It is longitudinal
Spherical aberration figure is detailed in Figure 23, it can be seen that color difference is small, and within the scope of wavelength error, color difference is less than ± 0.04mm；Relative illumination figure is detailed
See Figure 24, it can be seen that relative illumination is greater than 70%.
In this specific embodiment, the focal length f=5.35mm of optical imaging lens；F-number FNO=2.2；TTL=
10.32mm；Working substance is away from for 0.65m.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
It is white, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (8)
1. a kind of optical imaging lens, it is characterised in that: from object side to image side along an optical axis successively include the first lens, second thoroughly
Mirror, the third lens and the 4th lens；First lens respectively include one towards object side to the 4th lens and pass through imaging ray
Object side and one towards image side and the image side surface that passes through imaging ray；
First lens have negative refractive index, and the object side of first lens is convex surface, and the image side surface of first lens is concave surface；
Second lens have positive refractive index, and the object side of second lens is convex surface, and the image side surface of second lens is concave surface；
The third lens have negative refractive index, and the object side of the third lens is concave surface, and the image side surface of the third lens is convex surface, should
The object side of the third lens and image side surface are aspherical；
4th lens have positive refractive index, and the object side of the 4th lens is convex surface, the object side of the 4th lens and image side surface
It is aspherical；
The third lens and the 4th lens are all made of plastic material and are made；
There are the optical imaging lens lens of refractive index there was only above-mentioned four.
2. optical imaging lens according to claim 1, it is characterised in that: further include diaphragm, which is arranged second
Between lens and the third lens.
3. optical imaging lens according to claim 1, which is characterized in that the optical imaging lens also meet: vd1 > 70,
Wherein, vd1 is abbe number of first lens in d line.
4. optical imaging lens according to claim 1, which is characterized in that the optical imaging lens also meet: nd2 >
1.9, wherein nd2 is refractive index of second lens in d line.
5. optical imaging lens according to claim 1, which is characterized in that the optical imaging lens also meet: f2/f3 <
0.3, wherein f2 and f3 is respectively the focal length of second lens and the third lens.
6. optical imaging lens according to claim 1, which is characterized in that the optical imaging lens also meet: 1.6 < nd3
< 1.65,20 < vd3 < 25；1.6 < nd4 < 1.65,20 < vd4 < 25, wherein nd3 and nd4 is respectively that the third lens and the 4th are saturating
For mirror in the refractive index of d line, vd3 and vd4 are respectively the abbe number of the third lens and the 4th lens in d line.
7. optical imaging lens according to claim 1, which is characterized in that the optical imaging lens also meet: TTL <
11mm, wherein TTL is distance of the object side of first lens to an imaging surface on optical axis.
8. optical imaging lens according to claim 1, it is characterised in that: the image side surface of the 4th lens is concave surface or convex
Face.
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| CN112612116A (en) * | 2020-12-30 | 2021-04-06 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN112882190A (en) * | 2019-11-29 | 2021-06-01 | 大立光电股份有限公司 | Lens system and electronic device |
| CN114967061A (en) * | 2022-06-15 | 2022-08-30 | 安徽光智科技有限公司 | Large-target-surface low-distortion athermal infrared lens |
| CN115079378A (en) * | 2022-06-15 | 2022-09-20 | 安徽光智科技有限公司 | Short-focus low-distortion athermal infrared lens |
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