CN105866934B - Four-piece type imaging lens group - Google Patents
Four-piece type imaging lens group Download PDFInfo
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- CN105866934B CN105866934B CN201510035814.3A CN201510035814A CN105866934B CN 105866934 B CN105866934 B CN 105866934B CN 201510035814 A CN201510035814 A CN 201510035814A CN 105866934 B CN105866934 B CN 105866934B
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Abstract
A kind of four-piece type imaging lens group includes a fixed diaphram, an and optics group, the optics group includes one first, one second, one third and the 4th eyeglass, first eyeglass have near the central optical axis positive refractive power and towards object side be convex surface, second eyeglass have near the central optical axis positive refractive power and towards image side be convex surface, at least one face is aspherical, the third eyeglass have near the central optical axis negative refractive power and towards image side be convex surface, at least one face is aspherical, 4th eyeglass has refractive power near central optical axis, towards object side be convex surface facing image side be concave surface, there is the point of inflexion at least one face, and meet the following conditions：2.5<OAL/EPD<4.5, Vd2 Vd3>20,1.0<OL/ΣLC<1.5.
Description
Technical field
The present invention relates to a kind of camera lenses, more particularly to a kind of four-piece type imaging lens group.
Background technology
Existing imaging lens group, be suitable for mobile phone, Smartphone, tablet computer, notebook computer and
Imaging lens group in the electronic products such as camera.As this electronic product constantly develops, it is increasingly towards light and short
Design inclination, but require simultaneously it is high-effect, therefore, jointly so that imaging lens groups is towards the thin of whole even closerization
Molded dimension develops, and in order to improve the areas imaging that resolving power meets high image quality, such as resolution specification as 1920 × 1080
Full HD (High Definition), imaging lens group are also required to develop towards the direction of more wide-angle.
And existing imaging lens group fails further to meet thin although disclosing the imaging lens group of four-piece type
Type, the demand of wide-angle.
Therefore, in order to allow electronic product to have both light and short and dynamical advantage, one kind can be such that entirety more steps up
The slim size of densification, and the four-piece type imaging lens group that can improve resolving power is needed for existing market.
Invention content
The purpose of the present invention is to provide it is a kind of can slim and wide-angle four-piece type imaging lens group.
Four-piece type imaging lens group of the present invention, including a fixed diaphram and an optics group, which includes one
The first, second, third and the 4th eyeglass, sequence of the arrangement mode from object side to image side are：First eyeglass,
Have near the optical axis positive refractive power and towards object side be convex surface；Second eyeglass is just bent having near optical axis
Luminous power and towards image side be convex surface, at least one face be it is aspherical；The third eyeglass has negative dioptric near optical axis
Power and towards image side be convex surface, at least one face be it is aspherical；4th eyeglass has refractive power near optical axis,
Towards object side to be concave surface convex surface facing image side, there is the point of inflexion at least one face.
And the present invention meets the following conditions：2.5<OAL/EPD<4.5, Vd2-Vd3>20,1.0<OL/ΣLC<1.5, wherein
OAL is that the distance between imaging surface, EPD is the Entry pupil diameters of the imaging lens group, Vd2 for the first eyeglass object side on optical axis
For the Abbe number of second eyeglass, Vd3 is the Abbe number of the third eyeglass, and OL is that this is arrived in the first eyeglass object side on optical axis
Distance between 4th eyeglass image side surface, Σ LC are all center thickness summations with refractive power eyeglass in the imaging lens group.
Four-piece type imaging lens group of the present invention, meets the following conditions：0.2<YC42/OAL<0.4, wherein this
With at least one and one perpendicular to the tangent critical point C in the section of optical axis, critical point C and optical axis on four eyeglass image side surfaces
Vertical range be YC42.
Four-piece type imaging lens group of the present invention, meets the following conditions：0≤|Vd1-Vd2|<5, wherein Vd1 is should
The Abbe number of first eyeglass.
Four-piece type imaging lens group of the present invention, meets the following conditions：0.5<D12/D23<3.8, wherein D12 is
First eyeglass with second eyeglass at a distance from optical axis, D23 be second eyeglass and the third eyeglass on optical axis away from
From.
Four-piece type imaging lens group of the present invention, meets the following conditions：1.0<(|R1|+|R3|)/(|R5|+|R6|)
<9.0, wherein R1 is the radius of curvature of the first eyeglass object side, and R3 is the radius of curvature of the second eyeglass object side, and R5 is
The radius of curvature of the third eyeglass object side, R6 are the radius of curvature of the third eyeglass image side surface.
Four-piece type imaging lens group of the present invention, meets the following conditions：4<SD21/|SAG21|<18, wherein SD21
For maximum effective diameter on the second eyeglass object side, | SAG21 | at the second eyeglass maximum effective diameter perpendicular to the position of optical axis
It sets to the depth distance of the second eyeglass object center side point.
Four-piece type imaging lens group of the present invention, meets the following conditions：4.0<OAL/(LC1+D12)<6.5, wherein
LC1 be first eyeglass center thickness, D12 be first eyeglass with second eyeglass at a distance from optical axis.
Four-piece type imaging lens group of the present invention, the fixed diaphram are arranged between object and second eyeglass.
Four-piece type imaging lens group of the present invention, the third and the 4th eyeglass are all plastic cement material.
The beneficial effects of the present invention are：The design of mating surface type simultaneously passes through satisfaction 2.5<OAL/EPD<4.5, Vd2-Vd3>
20,1.0<OL/ΣLC<1.5, reach slim and wide-angle goal of the invention.
Description of the drawings
Fig. 1 is an optical texture schematic diagram, illustrates the specific embodiment one of four-piece type imaging lens group of the present invention；
Fig. 2 is a schematic diagram, illustrates the spherical aberration of specific embodiment one；
Fig. 3 is a schematic diagram, illustrates the astigmatism of specific embodiment one；
Fig. 4 is a schematic diagram, illustrates the distortion aberration of specific embodiment one；
Fig. 5 is a table, illustrates the design data of specific embodiment one；
Fig. 6 is a table, illustrates that the asphericity coefficient of specific embodiment one, 1 to 8 optical surface therein respectively refer to first
Face is to octahedral；
Fig. 7 is an optical texture schematic diagram, illustrates the specific embodiment two of four-piece type imaging lens group of the present invention；
Fig. 8 is a schematic diagram, illustrates the spherical aberration of specific embodiment two；
Fig. 9 is a schematic diagram, illustrates the astigmatism of specific embodiment two；
Figure 10 is a schematic diagram, illustrates the distortion aberration of specific embodiment two；
Figure 11 is a table, illustrates the design data of specific embodiment two；
Figure 12 is a table, illustrates that the asphericity coefficient of specific embodiment two, 1 to 8 optical surface therein respectively refer to
On one side to octahedral；
Figure 13 is an optical texture schematic diagram, illustrates the specific embodiment three of four-piece type imaging lens group of the present invention；
Figure 14 is a schematic diagram, illustrates the spherical aberration of specific embodiment three；
Figure 15 is a schematic diagram, illustrates the astigmatism of specific embodiment three；
Figure 16 is a schematic diagram, illustrates the distortion aberration of specific embodiment three；
Figure 17 is a table, illustrates the design data of specific embodiment three；
Figure 18 is a table, illustrates that the asphericity coefficient of specific embodiment three, 1 to 8 optical surface therein respectively refer to
On one side to octahedral；
Figure 19 is an optical texture schematic diagram, illustrates the specific embodiment four of four-piece type imaging lens group of the present invention；
Figure 20 is a schematic diagram, illustrates the spherical aberration of specific embodiment four；
Figure 21 is a schematic diagram, illustrates the astigmatism of specific embodiment four；
Figure 22 is a schematic diagram, illustrates the distortion aberration of specific embodiment four；
Figure 23 is a table, illustrates the design data of specific embodiment four；
Figure 24 is a table, illustrates that the asphericity coefficient of specific embodiment four, 1 to 8 optical surface therein respectively refer to
On one side to octahedral；
Figure 25 is an optical texture schematic diagram, illustrates the specific embodiment five of four-piece type imaging lens group of the present invention；
Figure 26 is a schematic diagram, illustrates the spherical aberration of specific embodiment five；
Figure 27 is a schematic diagram, illustrates the astigmatism of specific embodiment five；
Figure 28 is a schematic diagram, illustrates the distortion aberration of specific embodiment five；
Figure 29 is a table, illustrates the design data of specific embodiment five；
Figure 30 is a table, illustrates that the asphericity coefficient of specific embodiment five, 1 to 8 optical surface therein respectively refer to
On one side to octahedral；
Figure 31 is a table, illustrates every Optical Parametric of four-piece type imaging lens group specific embodiment one to five of the present invention
Number.
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and embodiments.
Before the present invention is described in detail, it shall be noted that in the following description content, similar element is with identical
Number indicate that and each embodiment lens group wavelength is 587nm.
Refering to fig. 1 to Fig. 6, four-piece type imaging lens group of the present invention includes a fixed diaphram 1 and an optics group 2, is somebody's turn to do
Optics group 2 includes first, second, third and the 4th eyeglass 21,22,23,24, and arrangement mode is from object side
Sequence to image side is：
First eyeglass 21 has positive refractive power near optical axis and is being convex surface towards the face of object side (the first face), should
First eyeglass 21 also has the face (the second face) towards image side；
Second eyeglass 22 has refractive power near optical axis and is being concave surface, direction towards the face of object side (third face)
The face (fourth face) of image side is convex surface, at least one face is aspherical, when it is implemented, second eyeglass 22 is close to optical axis
Nearby there is positive refractive power；
The third eyeglass 23 has negative refractive power near optical axis and is being convex surface towards the face of image side (the 6th face), until
Face is aspherical there are one few, which has the point of inflexion, which also has towards object
The face (the 5th face) of side；
4th eyeglass 24 has refractive power near optical axis, and the face (the 7th face) towards object side is convex surface facing picture
Side is concave surface, at least one face has the point of inflexion, the 4th eyeglass 24 also to have the face (octahedral) towards image side；
The fixed diaphram 1 is arranged between object and second eyeglass 22, and the third eyeglass 23 and the 4th eyeglass 24
It is all plastic cement material.
And four-piece type imaging lens group of the present invention meets the following conditions：
2.5<OAL/EPD<4.5, (1)
Vd2-Vd3>20, (2)
1.0<OL/ΣLC<1.5, (3)
0.2<YC42/OAL<0.4, (4)
0≤|Vd1-Vd2|<5, (5)
0.5<D12/D23<3.8, (6)
1.0<(|R1|+|R3|)/(|R5|+|R6|)<9.0, (7)
4<SD21/|SAG21|<18, (8)
4.0<OAL/(LC1+D12)<6.5, (9)
0.5<tan(FOV/2)/YC42<1.8, (10)
0<f2/Vd2<0.2, (11)
0.4<LC3/LC2<1.5, (12)
0.2<EPD/SD42<0.4, (13)
0.1<|SAG32|+|SAG41|<0.5, (14)
Wherein, OAL is that the distance between imaging surface, EPD is the imaging lens for the 21 object side of the first eyeglass on optical axis
The Entry pupil diameters of group, Vd1 are the Abbe number of first eyeglass 21, and Vd2 is the Abbe number of second eyeglass 22, and Vd3 is the third
The Abbe number of eyeglass 23, OL be on optical axis the 21 object side of the first eyeglass to the distance between 24 image side surface of the 4th eyeglass, Σ
LC is all center thickness summations with refractive power eyeglass in the imaging lens group, is had extremely on 24 image side surface of the 4th eyeglass
Few one with one perpendicular to the tangent critical point C in the section of optical axis, the vertical range of critical point C and optical axis is YC42, D12
For first eyeglass 21 towards image side face (the second face) and second eyeglass 22 towards object side face (third face) on optical axis
Distance, when the fixed diaphram 1 be arranged between object and first eyeglass 21 when, D12 refers to the second face in Figure of description
Thickness/interval, when the fixed diaphram 1 be arranged between first eyeglass 21 and the second eyeglass 22 when, D12 refers in Figure of description
The second face thickness/interval and fixed diaphram the sum of thickness/interval；D23 is face (the of second eyeglass 22 towards image side
On four sides) with the third eyeglass 23 towards object side face (the 5th face) at a distance from optical axis, refer to the fourth face in Figure of description
Thickness/interval；R1 is the radius of curvature of the 21 object side of the first eyeglass, and R3 is the curvature half of the 22 object side of the second eyeglass
Diameter, R5 are the radius of curvature of the 23 object side of third eyeglass, and R6 is the radius of curvature of 23 image side surface of third eyeglass, and SD21 is should
Maximum effective diameter on second eyeglass, 22 object side, | SAG21 | at the maximum effective diameter of second eyeglass 22 perpendicular to the position of optical axis
It sets to the depth distance of second eyeglass, 22 object center side point, LC1 is the center thickness of first eyeglass 21, and it is attached to refer to specification
Thickness/the interval in the first face in figure；LC2 is the center thickness of second eyeglass 22, refers to the third face in Figure of description
Thickness/interval；FOV is the maximum field of view angle in the imaging lens group, and f2 is the focal length value of second eyeglass 22, LC3 be this
The center thickness of three eyeglasses 23 refers to the thickness/interval in the 5th face in Figure of description；| SAG32 | it is 23 court of third eyeglass
Correspond to the depth at the minute surface center to the maximum effective diameter in the face of image side perpendicular to optical axis position, | SAG41 | it is the 4th
Eyeglass 24 is towards the depth for corresponding to the minute surface center at the maximum effective diameter in the face of object side perpendicular to optical axis position, SD42 the
Maximum effective diameter on four eyeglasses, 24 image side surface.
And aforementioned aspherical face type meets following equation：
Wherein z is along optical axis direction in the positional value that be highly the position of h make to refer to surface vertices；K is cone normal manner amount；
C is the inverse of radius of curvature；A, B, C, D, E, F, G, H, J are order aspherical coefficients.
When it is implemented, the four-piece type imaging lens group further includes a filter piece, which has one towards object side
Face (the 9th face), one towards image side face (the tenth face)；
In addition, the four-piece type imaging lens group can also include a protection eyeglass, which has one towards object side
Face (the tenth one side), one towards image side face (the 12nd face).
Fig. 1 to Fig. 6 is specific embodiment one, and related data is：OAL=2.079mm, EPD=0.555mm, f2=
1.147mm, Vd1=55.6, Vd2=55.6, Vd3=22.4, SD21=0.684mm, SD42=2.140mm, R1=
0.963mm, R3=-1.750mm, R5=-0.228mm, R6=-0.482mm, Σ LC=1.083mm, FOV=87.4 °, LC1=
0.234mm, LC2=0.346mm, LC3=0.18mm, D12=0.123mm, D23=0.117mm, OL=1.348mm, YC42=
0.795mm, | SAG21 |=0.073mm, | SAG32 |=0.259mm, | SAG41 |=0.092mm.
Fig. 7 to Figure 12 is specific embodiment two, and related data is：OAL=4.45mm, EPD=1.428mm, f2=
6.411mm, Vd1=55.6, Vd2=55.6, Vd3=22.4, SD21=1.528mm, SD42=4.245mm, R1=
1.370mm, R3=-5.596mm, R5=-1.318mm, R6=-5.160mm, Σ LC=2.151mm, FOV=76.0 °, LC1=
0.395mm, LC2=0.361mm, LC3=0.523mm, D12=0.482mm, D23=0.138mm, OL=2.996mm, YC42
=1.192mm, | SAG21 |=0.121mm, | SAG32 |=0.244mm, | SAG41 |=0.207mm.
Figure 13 to Figure 18 is specific embodiment three, and related data is：OAL=3.410mm, EPD=1.123mm, f2=
4.237mm, Vd1=57.1, Vd2=55.6, Vd3=22.4, SD21=1.241mm, SD42=3.751mm, R1=
1.359mm, R3=-3.692mm, R5=-0.388mm, R6=-0.732mm, Σ LC=1.890mm, FOV=87.0 °, LC1=
0.452mm, LC2=0.402mm, LC3=0.200mm, D12=0.253mm, D23=0.221mm, OL=2.390mm, YC42
=1.216mm, | SAG21 |=0.144mm, | SAG32 |=0.396mm, | SAG41 |=0.004mm.
Figure 19 to Figure 24 is specific embodiment four, and related data is：OAL=2.019mm, EPD=0.479mm, f2=
1.063mm, Vd1=55.6, Vd2=55.6, Vd3=22.4, SD21=0.540mm, SD42=2.078mm, R1=
1.041mm, R3=-2.545mm, R5=-0.201mm, R6=-0.289mm, Σ LC=1.067mm, FOV=94.6 °, LC1=
0.233mm, LC2=0.379mm, LC3=0.18mm, D12=0.098mm, D23=0.135mm, OL=1.325mm, YC42=
0.71mm, | SAG21 |=0.034mm, | SAG32 |=0.307mm, | SAG41 |=0.009mm.
Figure 25 to Figure 30 is specific embodiment five, and related data is：OAL=2.14mm, EPD=0.612mm, f2=
9.465mm, Vd1=55.6, Vd2=55.6, Vd3=22.4, SD21=0.831mm, SD42=2.206mm, R1=
1.152mm, R3=-1.018mm, R5=-0.347mm, R6=-0.420mm, Σ LC=1.011mm, FOV=88.0 °, LC1=
0.326mm, LC2=0.220mm, LC3=0.181mm, D12=0.142mm, D23=0.068mm, OL=1.246mm, YC42
=0.753mm, | SAG21 |=0.157mm, | SAG32 |=0.160mm, | SAG41 |=0.008mm.
Refering to Figure 31, for by the related data of the specific embodiment one to five of four-piece type imaging lens group of the present invention substitute into
The numerical value of conditional (1) to (14).
In conclusion the effect of four-piece type imaging lens group of the present invention, is, the design of mating surface type and by meeting item
Part formula (1) to (14), reaches slim and wide-angle goal of the invention.
Claims (10)
1. a kind of four-piece type imaging lens group, it is characterised in that it includes：
One fixed diaphram；And
One optics group, the optics group include first, second, third and the 4th eyeglass, arrangement mode
Sequence from object side to image side is：
First eyeglass has positive refractive power near optical axis；
Second eyeglass is aspherical having positive refractive power, at least one face near optical axis；
The third eyeglass is aspherical having refractive power, at least one face near optical axis；
4th eyeglass has refractive power near optical axis, there is the point of inflexion at least one face；
The fixed diaphram is arranged between object and second eyeglass, and meets the following conditions：
0.2<EPD/SD42<0.4,
0.1<|SAG32|+|SAG41|<0.5,
1.0<OL/ΣLC<1.5
Wherein, EPD is the Entry pupil diameters of the imaging lens group, and SD42 is maximum effective diameter on the 4th eyeglass image side surface, |
SAG32 | correspond to the minute surface center perpendicular to optical axis position towards at the maximum effective diameter in the face of image side for the third eyeglass
Depth, | SAG41 | correspond to the minute surface perpendicular to optical axis position towards at the maximum effective diameter in the face of object side for the 4th eyeglass
The depth at center, OL be on optical axis the first eyeglass object side arrive the distance between the 4th eyeglass image side surface, Σ LC for this at
As all center thickness summations with refractive power eyeglass in lens group.
2. four-piece type imaging lens group according to claim 1, it is characterised in that：Meet the following conditions：4<SD21/|
SAG21|<18, wherein SD21 is maximum effective diameter on the second eyeglass object side, | SAG21 | it is maximum effectively for second eyeglass
Perpendicular to the position of optical axis to the depth distance of the second eyeglass object center side point at diameter.
3. four-piece type imaging lens group according to claim 1, it is characterised in that：Meet the following conditions：0.2<YC42/
OAL<0.4, wherein at least one and one perpendicular to the tangent critical point in the section of optical axis on the 4th eyeglass image side surface
The vertical range of C, critical point C and optical axis be YC42, OAL be on optical axis the first eyeglass object side between imaging surface away from
From.
4. four-piece type imaging lens group according to claim 1, it is characterised in that：Meet the following conditions：0≤|Vd1-Vd2
|<5, wherein Vd1 is the Abbe number of first eyeglass, and Vd2 is the Abbe number of second eyeglass.
5. four-piece type imaging lens group according to claim 1, it is characterised in that：Meet the following conditions：0.5<D12/D23
<3.8, wherein D12 be first eyeglass with second eyeglass at a distance from optical axis, D23 is second eyeglass and the third mirror
Piece is in the distance on optical axis.
6. four-piece type imaging lens group according to claim 1, it is characterised in that：Meet the following conditions：4.0<OAL/
(LC1+D12)<6.5, wherein OAL be on optical axis the first eyeglass object side to the distance between imaging surface, LC1 be this first
The center thickness of eyeglass, D12 be first eyeglass with second eyeglass at a distance from optical axis.
7. four-piece type imaging lens group according to claim 1, it is characterised in that：Meet the following conditions：1.0<(|R1|+|
R3|)/(|R5|+|R6|)<9.0, wherein R1 is the radius of curvature of the first eyeglass object side, and R3 is the second eyeglass object side
Radius of curvature, R5 be the third eyeglass object side radius of curvature, R6 be the third eyeglass image side surface radius of curvature.
8. four-piece type imaging lens group according to claim 1, it is characterised in that：At least one face of third eyeglass has
The point of inflexion.
9. four-piece type imaging lens group according to claim 1, it is characterised in that：The third eyeglass is near optical axis
With negative refractive power.
10. four-piece type imaging lens group according to claim 1, it is characterised in that：First eyeglass is attached close to optical axis
It is closely convex surface towards object side, which is convex surface towards image side near close optical axis, and the third eyeglass is close to optical axis
It is nearby convex surface towards image side, the 4th eyeglass is being concave surface convex surface facing image side towards object side near optical axis.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1945370A (en) * | 2005-10-08 | 2007-04-11 | 大立光电股份有限公司 | Thin imaging lens group |
| CN203385928U (en) * | 2013-07-09 | 2014-01-08 | 先进光电科技股份有限公司 | Thin four-piece imaging lens group |
| CN104570290A (en) * | 2013-10-22 | 2015-04-29 | 先进光电科技股份有限公司 | Thin wide-angle four-piece imaging lens set |
| CN105676420A (en) * | 2014-12-04 | 2016-06-15 | 先进光电科技股份有限公司 | Optical imaging system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI421560B (en) * | 2010-10-26 | 2014-01-01 | Largan Precision Co Ltd | Optical lens assembly |
-
2015
- 2015-01-23 CN CN201510035814.3A patent/CN105866934B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1945370A (en) * | 2005-10-08 | 2007-04-11 | 大立光电股份有限公司 | Thin imaging lens group |
| CN203385928U (en) * | 2013-07-09 | 2014-01-08 | 先进光电科技股份有限公司 | Thin four-piece imaging lens group |
| CN104570290A (en) * | 2013-10-22 | 2015-04-29 | 先进光电科技股份有限公司 | Thin wide-angle four-piece imaging lens set |
| CN105676420A (en) * | 2014-12-04 | 2016-06-15 | 先进光电科技股份有限公司 | Optical imaging system |
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