CN104570287B - The high pixel lens assembly of big wide-angle large aperture - Google Patents
The high pixel lens assembly of big wide-angle large aperture Download PDFInfo
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- CN104570287B CN104570287B CN201410788010.6A CN201410788010A CN104570287B CN 104570287 B CN104570287 B CN 104570287B CN 201410788010 A CN201410788010 A CN 201410788010A CN 104570287 B CN104570287 B CN 104570287B
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- 230000003287 optical effect Effects 0.000 claims abstract description 40
- 239000000571 coke Substances 0.000 claims abstract description 8
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- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000007493 shaping process Methods 0.000 abstract description 8
- 238000003384 imaging method Methods 0.000 description 10
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- 230000000694 effects Effects 0.000 description 5
- 238000009738 saturating Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 3
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
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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
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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
- G02B13/18—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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Abstract
The present invention relates to a kind of big high pixel lens assembly of wide-angle large aperture, including the ratio between the first lens with positive light coke, the second lens with positive or negative focal power and the 3rd lens with negative power, the focal length F of the camera lens and focal length F1 of the first lens to be：1.2<F/F1<2.8；First lens are in the ratio between spacing distance T12 on optical axis in the thickness D1 on optical axis and the first lens, the second lens：3.5<D1/T12<6.8；First lens, the second lens, the refractive index of the 3rd lens meet following relationship：1.4<n1<1.56<n2<1.6<n3<1.8.The thickness of each eyeglass of lens assembly of the present invention is both greater than 0.4mm, beneficial to shaping and volume production；Gap is small between eyeglass, compact-sized, and overall length is shorter；Three aspherical lens are reasonably combined, ensure that higher image quality.
Description
Technical field
The present invention relates to optical lens technical field, more particularly to a kind of big high pixel lens assembly of wide-angle large aperture.
Background technology
With becoming stronger day by day for smart mobile phone function, the requirement for being imaged image quality is also grown with each passing hour.Look back from photograph in 2000
Since the more than ten years that phase mobile phone is born, camera function progressively permeates mobile phone, and gradually ripe, single in terms of pixel this angle, mirror
Head develops into 13,000,000 current pixel camera lenses from 110,000 original pixels.With researching and developing also not overripened high pixel
Camera lens is compared, and 5,000,000 pixel lens constructions being made up of three sized non-spherical resin lens turn into the master in preposition pick-up lens market
Power army.The lightening trend of body also make it that the lens thickness of lens design is thinning simultaneously, difficult forming；In addition, as eyeglass is done
It is too thin, can also influence the image quality of camera lens, how while production efficiency, easily shaping is ensured and can improves camera lens
Imaging effect, it is the problem of technical field by research is needed for a long time.
The content of the invention
To solve the above problems, the present invention provides the big high pixel lens assembly of wide-angle large aperture, the thickness of each of which eyeglass
Both greater than 0.4mm, beneficial to shaping and volume production；Gap is small between eyeglass, compact-sized, and overall length is shorter；Three aspherical lens are reasonable
Collocation, ensure that higher image quality.
The technical solution adopted in the present invention is：A kind of high pixel lens assembly of big wide-angle large aperture, including from thing side extremely
The first lens, the second lens, the 3rd lens, optical filter and the light for being arranged at the first lens thing side that image side is arranged in order
Door screen, first lens have positive light coke and one towards thing side convex surface, one towards image side convex surface；Second lens
With positive light coke and one towards thing side concave surface；3rd lens have negative power；It is the lens assembly, first saturating
Mirror, the second lens, the 3rd lens meet following relationship：1.2 ＜ F/F1 ＜ 2.8；2.5 ＜ T12/T23 ＜ 5；3.5 ＜ D1/T12
＜ 6.8；9 ＜ D2/T23 ＜ 15；The ＜ n3 ＜ 1.8 of 1.4 ＜ n1 ＜, 1.56 ＜ n2 ＜ 1.6；Wherein, F is Jiao of the lens assembly
Away from；F1 is the focal length of first lens；T12 is first lens, the second lens in the spacing distance on optical axis；T23 is
Second lens, the 3rd lens are in the spacing distance on optical axis；D1 is first lens in the thickness on optical axis；D2 is
Second lens are in the thickness on optical axis；N1, n2, n3 are respectively the refraction of first lens, the second lens, the 3rd lens
Rate.
Preferably, first lens meet following relational expression：30<(R1-R2)/(R1+R2)<50, wherein R1 is described
The radius of curvature of first lens thing side surface；R2 is the radius of curvature on the first lens image side surface.
Preferably, first lens meet following relational expression：-2<R2/R1<- 1, wherein R1 are the first lens thing
The radius of curvature of side surface；R2 is the radius of curvature on the first lens image side surface.
Preferably, the 3rd lens meet following relationship：-6<R5/R6<- 15, wherein R5 are the 3rd lens thing
The radius of curvature of side surface；R6 is the radius of curvature on the 3rd lens image side surface.
Preferably, the 3rd lens meet following relationship：15<R5/R6<23, wherein R5 are the 3rd lens thing
The radius of curvature of side surface；R6 is the radius of curvature on the 3rd lens image side surface.
Preferably, first lens, the second lens, the 3rd lens meet following relationship：0.8<Vd1/ (Vd2+
Vd3)<2.3, wherein Vd1 are the Abbe number of first lens；Vd2 is the Abbe number of second lens；Vd3 is described the
The Abbe number of three lens.
Preferably, second lens, the 3rd lens meet following relationship：25<Vd2<35,20< Vd3<25, wherein
Vd2 is the Abbe number of second lens；Vd3 is the Abbe number of the 3rd lens.
Preferably, the center thickness of first lens is 0.715~0.895mm, the center thickness of second lens
For 0.425~0.695mm, the center thickness of the 3rd lens is 0.459~0.825mm.
The present invention also adopts the following technical scheme that：A kind of high pixel lens assembly of big wide-angle large aperture, including from thing side extremely
The first lens, the second lens, the 3rd lens, optical filter and the light for being arranged at the first lens thing side that image side is arranged in order
Door screen, first lens have positive light coke and one towards thing side convex surface, one towards image side convex surface；Second lens
With negative power and one towards thing side concave surface；3rd lens have negative power；It is the lens assembly, first saturating
Mirror, the second lens, the 3rd lens meet following relationship：1.2<F/F1<2.8；1<F3/F2<3；3.5<D1/T12<6.8； 1.4
<n1<1.56<n2<1.6<n3<1.8；Wherein, F is the focal length of the lens assembly；F1 is the focal length of first lens；F2 is institute
State the focal length of the second lens；F3 is the focal length of the 3rd lens；T12 is first lens, the second lens on optical axis
Spacing distance；D1 is first lens in the thickness on optical axis；N1, n2, n3 be respectively first lens, the second lens,
The refractive index of 3rd lens.
Preferably, first lens meet following relational expression：-2<R2/R1<- 1, wherein R1 are the first lens thing
The radius of curvature of side surface；R2 is the radius of curvature on the first lens image side surface.
Preferably, first lens, the second lens, the 3rd lens meet following relationship：0.8<Vd1/ (Vd2+
Vd3) ＜ 2.3, wherein Vd1 are the Abbe number of first lens；Vd2 is the Abbe number of second lens；Vd3 is described the
The Abbe number of three lens.
Preferably, second lens, the 3rd lens meet following relationship：The ＜ Vd3 ＜ 25 of 25 ＜ Vd2 ＜ 35,20,
Wherein Vd2 is the Abbe number of second lens；Vd3 is the Abbe number of the 3rd lens.
Preferably, the center thickness of first lens is 0.715~0.895mm, the center thickness of second lens
For 0.425~0.695mm, the center thickness of the 3rd lens is 0.459~0.825mm.
The high pixel lens assembly of big wide-angle large aperture, beneficial effect compared with prior art are：
1) present invention devises the 1/5 of a kind of 3P, and " the high pixel lens assembly of big wide-angle large aperture, is meeting mobile lens
While small form factor requirements, the performance also taken pictures with high definition；The thickness of each eyeglass of the lens group is both greater than 0.4mm, is beneficial to
Shaping and volume production；Gap is small between eyeglass, compact-sized, and overall length is shorter.
2) lens assembly also has the characteristics of big wide-angle large aperture, and the design of large aperture adds the entering light of shooting process
Amount, ensure that the light levels of shooting picture；The FOV of the camera lens reaches 70~80 degree, mobile phone is had larger coverage.
3) lens assembly also has the characteristics of high-resolution, cost-effective using the structure of three aspherical lens
It can effectively correct all kinds of aberrations such as the curvature of field, astigmatism, ratio chromatism, simultaneously；Substitute glass using resins for universal use material on the market, into
Type technical maturity is more ripe, solves that glass lens product efficiency caused by processing difficulties is low and cost is higher asks
Topic.
4) optical distortion of the lens assembly is less than 1.5%, and the curvature of field is less than 0.1mm.It is small to be imaged distortion, definition
It is high.
5) in the first lens, R2 is arranged to negative tortuosity ratio so that MTF value of the central vision at 2231p/mm is more than
55% and mtf value of the outer visual field of most axles in 2231p/mm be more than 40%, substantially increase the imaging of 3P lens structures
Energy, reach the imaging effect of 4P lens structures.
Brief description of the drawings
Fig. 1 is the structural representation of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 1；
Fig. 2 is the curvature of field of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 1, distortion curve；
Fig. 3 is the spherical aberration curve of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 1；
Fig. 4 is the structural representation of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 2；
Fig. 5 is the curvature of field of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 2, distortion curve；
Fig. 6 is the spherical aberration curve of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 2；
Fig. 7 is the structural representation of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 3；
Fig. 8 is the curvature of field of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 3, distortion curve；
Fig. 9 is the spherical aberration curve of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 3；
Figure 10 is the structural representation of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 4；
Figure 11 is the curvature of field of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 4, distortion curve；
Figure 12 is the spherical aberration curve of the high pixel lens assembly of the big wide-angle large aperture of the embodiment of the present invention 4.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Embodiment 1：
Reference picture 1, the big high pixel camera lens resin component of wide-angle large aperture of the present invention, it is by three plastic cement (tree
Fat) aspherical lens combine, it include from object side to be arranged in order into image side the first lens 1, the second lens 2, the
Three lens 3, optical filter 4, and diaphragm 5, wherein diaphragm 5 are arranged at the thing side of the first lens 1, by the way of diaphragm is preposition,
First lens 1 have positive light coke and one towards thing side convex surface, one towards image side convex surface；Second lens 2 have positive light
Focal power and one towards thing side concave surface；3rd lens 3 have negative power.
Wherein, the lens assembly, the first lens 1, the second lens 2, the 3rd lens 3 meet following relationship：1.2 ＜ F/
F1 ＜ 2.8；2.5 ＜ T12/T23 ＜ 5；3.5 ＜ D1/T12 ＜ 6.8；9 ＜ D2/T23 ＜ 15；The ＜ n2 ＜ of 1.4 ＜ n1 ＜ 1.56
1.6 ＜ n3 ＜ 1.8；30 ＜ (R1-R2)/(R1+R2) ＜ 50；- 6 ＜ R5/R6 ＜ -15；0.8 ＜ Vd1/ (Vd2+Vd3) ＜ 2.3；
The ＜ Vd3 ＜ 25 of 25 ＜ Vd2 ＜ 35,20.
Wherein, F is the focal length of the lens assembly；F1 is the focal length of the first lens 1；T12 is the first lens 1, the second lens 2
In the spacing distance on optical axis；T23 is the second lens 2, the 3rd lens 3 in the spacing distance on optical axis；D1 be the first lens 1 in
Thickness on optical axis；D2 is the second lens 2 in the thickness on optical axis；R1 is the radius of curvature of the thing side surface of the first lens 1；R2
For the radius of curvature on the image side surface of the first lens 1；R5 is the radius of curvature of the thing side surface of the 3rd lens 3；R6 is the picture of the 3rd lens 3
The radius of curvature of side surface；Vd1 is the Abbe number of the first lens 1；Vd2 is the Abbe number of the second lens 2；Vd3 is the 3rd lens
3 Abbe number；N1, n2, n3 are respectively the first lens 1, the second lens 2, the refractive index of the 3rd lens 3.
Wherein, the thickness of optical filter 4 is 0.21mm in the embodiment, the center thicknesses of the first lens 1 for 0.815~
0.895mm, the center thicknesses of the second lens 2 are 0.635~0.695mm, the center thicknesses of the 3rd lens 3 for 0.615~
0.665mm。
In the lens assembly：The radius of curvature R 1 of the thing side surface of first lens 1 ensures with the radius of curvature on image side surface
Following scope：30 ＜ (R2-R1)/(R2+R1) ＜ 50, and R2 is arranged to negative tortuosity ratio so that central vision is at 2231p/mm
Mtf value be more than 55% and the outer visual field of most axles 2231p/mm MTF values more than 40%, greatly improve 3P eyeglass knots
The imaging performance of structure, reach the imaging effect of 4P lens structures.
The thickness of each eyeglass of the lens assembly is both greater than 0.4mm, beneficial to shaping and volume production；Eyeglass gap meets：2.5 ＜
T12/T23 ＜ 5；3.5 ＜ D1/T12 ＜ 6.8；9 ＜ D2/T23 ＜ 15, gap is small between eyeglass, and compact-sized, overall length is shorter；Utilize
3 plastic lens of low cost meet the image quality of high pixel.
In addition, the first lens 1, the second lens 2, the 3rd the aspherical of lens 3 meet formula：
Wherein, 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, and c is lens measure
The inverse of the radius of curvature R in face, k are circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For asphericity coefficient.
Lens group, data citing such as the (F of table one can be further set according to the specific data of parameters in above-mentioned formula
=2.39mm, FNO=2.4, FOV=74.5 °)
Each lens data table of the lens assembly of table one
Embodiment 2：
Reference picture 4, as different from Example 1, in the big high pixel lens assembly of wide-angle large aperture, lens assembly,
First lens 1, the second lens 2, the 3rd lens 3 meet following relationship：
1.2 ＜ F/F1 ＜ 2.8；2.5 ＜ T12/T23 ＜ 5；3.5 ＜ D1/T12 ＜ 6.8；9 ＜ D2/T23 ＜ 15；1.4 ＜
The ＜ n3 ＜ 1.8 of 1.56 ＜ n2 ＜ of n1 ＜ 1.6；- 2 ＜ R2/R1 ＜ -1；- 6 ＜ R5/R6 ＜ -515；0.8 ＜ Vd1/ (Vd2+Vd3)
＜ 2.3；The ＜ Vd3 ＜ 25 of 25 ＜ Vd2 ＜ 35,20.
Wherein, F is the focal length of the lens assembly；F1 is the focal length of the first lens 1；T12 is the first lens 1, the second lens 2
In the spacing distance on optical axis；T23 is the second lens 2, the 3rd lens 3 in the spacing distance on optical axis；D1 be the first lens 1 in
Thickness on optical axis；D2 is the second lens 2 in the thickness on optical axis；R1 is the radius of curvature of the thing side surface of the first lens 1；R2
For the radius of curvature on the image side surface of the first lens 1；R5 is the radius of curvature of the thing side surface of the 3rd lens 3；R6 is the 3rd lens 3
The radius of curvature on image side surface；Vd1 is the Abbe number of the first lens 1；Vd2 is the Abbe number of the second lens 2；Vd3 is the 3rd saturating
The Abbe number of mirror 3, n1, n2, n3 are respectively the first lens 1, the second lens 2, the refractive index of the 3rd lens 3.
Wherein, the thickness of optical filter 4 is 0.21mm in the embodiment, the center thicknesses of the first lens 1 for 0.815~
0.895mm, the center thicknesses of the second lens 2 are 0.485~0.525mm, the center thicknesses of the 3rd lens 3 for 0.745~
0.825mm。
The thickness of each eyeglass of the lens assembly is both greater than 0.4mm, beneficial to shaping and volume production；Eyeglass gap meets：2.5 ＜
T12/T23 ＜ 5；3.5 ＜ D1/T12 ＜ 6.8；9 ＜ D2/T23 ＜ 15, gap is small between eyeglass, and compact-sized, overall length is shorter；Utilize
3 plastic lens of low cost meet the image quality of high pixel.
First lens 1, the second lens 2, the 3rd the aspherical of lens 3 meet formula：
Wherein, 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, and c is lens measure
The inverse of the radius of curvature R in face, k are circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For asphericity coefficient.
Lens group, data citing such as the (F of table two can be further set according to the specific data of parameters in above-mentioned formula
=2.37mm, FNO=2.4, FOV=74.2 °)
Each lens data table of the lens assembly of table two
Embodiment 3：
Reference picture 7, as different from Example 1, the big high pixel lens assembly of wide-angle large aperture also include a protection
Sheet glass 6, it is located between optical filter 4 and the imaging surface of the lens assembly.In the present embodiment, lens assembly, the first lens 1,
Second lens 2, the 3rd lens 3 meet following relationship：
1.2 ＜ F/F1 ＜ 2.8；2.5 ＜ T12/T23 ＜ 5；3.5 ＜ D1/T12 ＜ 6.8；9 ＜ D2/T23 ＜ 15；1.4 ＜
The ＜ n3 ＜ 1.8 of 1.56 ＜ n2 ＜ of n1 ＜ 1.6；30 ＜ (R1-R2)/(R1+R2) ＜ 50；15 ＜ R5/R6 ＜ 23；0.8 ＜ Vd1/
(Vd2+Vd3) ＜ 2.3；The ＜ Vd3 ＜ 25 of 25 ＜ Vd2 ＜ 35,20.
Wherein, F is the focal length of the lens assembly；F1 is the focal length of the first lens 1；T12 is the first lens 1, the second lens 2
In the spacing distance on optical axis；T23 is the second lens 2, the 3rd lens 3 in the spacing distance on optical axis；D1 be the first lens 1 in
Thickness on optical axis；D2 is the second lens 2 in the thickness on optical axis；R1 is the radius of curvature of the thing side surface of the first lens 1；R2
For the radius of curvature on the image side surface of the first lens 1；R5 is the radius of curvature of the thing side surface of the 3rd lens 3；R6 is the 3rd lens 3
The radius of curvature on image side surface；Vd1 is the Abbe number of the first lens 1；Vd2 is the Abbe number of the second lens 2；Vd3 is the 3rd saturating
The Abbe number of mirror 3；N1, n2, n3 are respectively the first lens 1, the second lens 2, the refractive index of the 3rd lens 3.
Wherein, the thickness of optical filter 4 is 0.21mm in the embodiment, and the thickness of protective glass piece 6 is 0.40mm, the first lens
Center thickness be 0.805~0.885mm, the center thicknesses of the second lens is 0.625~0.695mm, the center of the 3rd lens
Thickness is 0.459~0.524mm.
In the lens assembly, the radius of curvature R 1 of the thing side surface of the first lens 1 is with the radius of curvature guarantee on image side surface：
30 ＜ (R2-R1)/(R2+R1) ＜ 50, and R2 is arranged to negative tortuosity ratio so that mtf value of the central vision at 2231p/mm is big
It is more than 40% in mtf value of the visual field outside 55% and most axles in 2231p/mm, greatly improves the imaging of 3P lens structures
Energy, reach the imaging effect of 4P lens structures.
The thickness of each eyeglass of the lens assembly is both greater than 0.4mm, beneficial to shaping and volume production；Eyeglass gap meets：2.5 ＜
T12/T23 ＜ 5；3.5 ＜ D1/T12 ＜ 6.8；9 ＜ D2/T23 ＜ 15, gap is small between eyeglass, and compact-sized, overall length is shorter；Utilize
3 plastic lens of low cost meet the image quality of high pixel.
First lens 1, the second lens 2, the 3rd the aspherical of lens 3 meet formula：
Wherein, 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, and c is lens measure
The inverse of the radius of curvature R in face, k are circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For asphericity coefficient.
Lens group, data citing such as the (F of table three can be further set according to the specific data of parameters in above-mentioned formula
=2.33mm, FNO=2.4, FOV=75.6 °)
Each lens data table of table three-lens component
Embodiment 4：
Reference picture 10, as different from Example 1, in the big high pixel lens assembly of wide-angle large aperture, the second lens 2
For negative power, the lens assembly, the first lens 1, the second lens 2, the 3rd lens 3 meet following relationship：
1.2 ＜ F/F1 ＜ 2.8；1 ＜ F3/F2 ＜ 3；3.5 ＜ D1/T12 ＜ 6.8；The ＜ of 1.4 ＜ n1 ＜, 1.56 ＜ n2 ＜ 1.6
N3 ＜ 1.8；- 2 ＜ R2/R1 ＜ -1；0.8 ＜ Vd1/ (Vd2+Vd3) ＜ 2.3；The ＜ Vd3 ＜ 25 of 25 ＜ Vd2 ＜ 35,20.Wherein, F
For the focal length of the lens assembly；F1 is the focal length of the first lens 1；F2 is the focal length of second lens；F3 is the described 3rd saturating
The focal length of mirror；T12 is the first lens 1, the second lens 2 in the spacing distance on optical axis；D1 is the first lens 1 on optical axis
Thickness；R1 is the radius of curvature of the thing side surface of the first lens 1；R2 is the radius of curvature on the image side surface of the first lens 1；Vd1 is
The Abbe number of one lens 1；Vd2 is the Abbe number of the second lens 2；Vd3 is the Abbe number of the 3rd lens 3；N1, n2, n3 are respectively
First lens 1, the second lens 2, the refractive index of the 3rd lens 3.
Wherein, the thickness of optical filter 4 is 0.21mm in the embodiment, the center thicknesses of the first lens for 0.715~
0.776mm, the center thicknesses of the second lens are 0.425~0.495mm, the center thicknesses of the 3rd lens for 0.745~
0.815mm。
In the lens assembly, the radius of curvature guarantee of the first lens 1 is：- 2 ＜ R2/R1 ＜ -1, and R2 is arranged to negative complications
Rate, the imaging performance of 3P lens structures is greatly improved, reach the imaging effect of 4P lens structures.
The thickness of each eyeglass of the lens assembly is both greater than 0.4mm, beneficial to shaping and volume production；Eyeglass gap meets：3.5 ＜
D1/T12 ＜ 6.8, gap is small between eyeglass, and compact-sized, overall length is shorter；High picture is met using 3 plastic lens of low cost
The image quality of element.
First lens 1, the second lens 2, the 3rd the aspherical of lens 3 meet formula：
Wherein, 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, and c is lens measure
The inverse of the radius of curvature R in face, k are circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For asphericity coefficient.
Lens group, data citing such as the (F of table four can be further set according to the specific data of parameters in above-mentioned formula
=2.57mm, FNO=2.2, FOV=70.4 °)
Each lens data table of the lens assembly of table four
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (4)
1. a kind of high pixel lens assembly of big wide-angle large aperture, including be arranged in order from thing side to image side the first lens (1),
Two lens (2), the 3rd lens (3), optical filter (4) and the diaphragm (5) for being arranged at the first lens (1) thing side, its feature
It is：First lens (1) have positive light coke and one towards thing side convex surface, one towards image side convex surface；Described
Two lens (2) have positive light coke and one towards thing side concave surface；3rd lens (3) have negative power；The mirror
Head assembly, the first lens (1), the second lens (2), the 3rd lens (3) meet following relationship：1.2<F/F1<2.8；2.5<
T12/T23<5；3.5<D1/T12<6.8；9<D2/T23<15；1.4<n1<1.56<n2<1.6<n3<1.8；
Wherein, F is the focal length of the lens assembly；F1 is the focal length of first lens (1)；T12 be first lens (1),
Second lens (2) are in the spacing distance on optical axis；T23 is second lens (2), the 3rd lens (3) in the interval on optical axis
Distance；D1 is first lens (1) in the thickness on optical axis；D2 is second lens (2) in the thickness on optical axis；N1,
N2, n3 are respectively first lens (1), the second lens (2), the refractive index of the 3rd lens (3)；
First lens (1) meet following relational expression：30<(R1-R2)/(R1+R2)<50, wherein R1 are first lens
(1) radius of curvature of thing side surface；R2 is the radius of curvature on the first lens (1) image side surface, or,
First lens (1) meet following relational expression：-2<R2/R1<- 1, wherein R1 are the first lens (1) thing side surface
Radius of curvature；R2 is the radius of curvature on the first lens (1) image side surface.
2. a kind of high pixel lens assembly of big wide-angle large aperture, including be arranged in order from thing side to image side the first lens (1),
Two lens (2), the 3rd lens (3), optical filter (4) and the diaphragm (5) for being arranged at the first lens (1) thing side, its feature
It is：First lens (1) have positive light coke and one towards thing side convex surface, one towards image side convex surface；Described
Two lens (2) have negative power and one towards thing side concave surface；3rd lens (3) have negative power；The mirror
Head assembly, the first lens (1), the second lens (2), the 3rd lens (3) meet following relationship：1.2<F/F1<2.8；1<F3/F2
<3；3.5<D1/T12<6.8；1.4<n1<1.56<n2<1.6<n3<1.8；
Wherein, F is the focal length of the lens assembly；F1 is the focal length of first lens (1)；F2 is second lens (2)
Focal length；F3 is the focal length of the 3rd lens (3)；T12 is first lens (1), the second lens (2) in the interval on optical axis
Distance；D1 is first lens (1) in the thickness on optical axis；N1, n2, n3 are respectively first lens (1), the second lens
(2), the refractive index of the 3rd lens (3)；First lens (1) meet following relational expression：-2<R2/R1<- 1, wherein R1 are institute
State the radius of curvature of the first lens (1) thing side surface；R2 is the radius of curvature on the first lens (1) image side surface；
First lens (1), the second lens (2), the 3rd lens (3) meet following relationship：0.8<Vd1/(Vd2+Vd3)<
2.3, wherein Vd1 are the Abbe number of first lens (1)；Vd2 is the Abbe number of second lens (2)；Vd3 is described the
The Abbe number of three lens (3).
3. the high pixel lens assembly of big wide-angle large aperture according to claim 2, it is characterised in that：Second lens
(2), the 3rd lens (3) meet following relationship：25<Vd2<35,20<Vd3<25, wherein Vd2 are second lens (2)
Abbe number；Vd3 is the Abbe number of the 3rd lens (3).
4. the high pixel lens assembly of big wide-angle large aperture according to claim 2, it is characterised in that：First lens
(1) center thickness is 0.715~0.895mm, and the center thickness of second lens (2) is 0.425~0.695mm, described
The center thickness of 3rd lens (3) is 0.459~0.825mm.
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| CN100462770C (en) * | 2004-10-28 | 2009-02-18 | 清华大学 | Micro Camera Lens System |
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| WO2013145989A1 (en) * | 2012-03-28 | 2013-10-03 | コニカミノルタ株式会社 | Image capture lens, image capture device, and portable terminal |
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| CN204331125U (en) * | 2014-12-17 | 2015-05-13 | 广东旭业光电科技股份有限公司 | Large wide-angle, large aperture, and high-pixel lens components |
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