CN115166944A

CN115166944A - Optical imaging lens

Info

Publication number: CN115166944A
Application number: CN202210949431.7A
Authority: CN
Inventors: 游赐天; 张荣曜; 陈嘉旺; 范智宇
Original assignee: Xiamen Leading Optics Co Ltd
Current assignee: Xiamen Leading Optics Co Ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2022-10-11

Abstract

The invention relates to the technical field of lenses. The invention discloses an optical imaging lens, which comprises seven lenses; the first lens element and the sixth lens element both have negative refractive index, and the object-side surface and the image-side surface at paraxial region are respectively convex and concave; the second lens element with positive refractive index has a convex image-side surface at paraxial region; the third lens element and the fifth lens element both have positive refractive index, and the object-side surface and the image-side surface at paraxial region are respectively concave and convex; the fourth lens is a convex lens with positive refraction; the seventh lens element has positive refractive index; the object side surface is convex at the paraxial region, and the image side surface is convex at the paraxial region; the fourth lens is made of glass materials, and the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses. The invention has the advantages of short overall length of the lens, small volume and low cost; large light transmission, small distortion, good imaging quality and small temperature drift.

Description

Optical imaging lens

Technical Field

The invention belongs to the technical field of lenses, and particularly relates to an optical imaging lens.

Background

With the continuous progress of science and technology and the continuous development of living standard, in recent years, the optical imaging lens has also been developed rapidly, and the optical imaging lens is widely applied in various fields such as smart phones, tablet computers, vehicle-mounted monitoring, security monitoring, unmanned aerial vehicle aerial photography, machine vision system, video conference and the like, so the requirement on the optical imaging lens is higher and higher.

However, the optical imaging lens in the market at present has many disadvantages, such as too large total optical length (TTL), and the use of multiple glass lenses or cemented lenses for correcting chromatic aberration makes the overall cost of the lens too high and the volume too large; the temperature drift amount of the lens is large, and when the temperature disturbance is too large, the imaging quality is influenced; the distortion is too large, the edge imaging quality is poor, and the post-processing difficulty is increased; the amount of light passing is small, which causes insufficient light entering amount of the lens, unclear imaging, etc., so it is necessary to improve it to meet the increasing demands of consumers.

Disclosure of Invention

The present invention is directed to an optical imaging lens to solve the above problems.

In order to achieve the purpose, the invention adopts the technical scheme that: an optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens respectively comprise an object side surface which faces the object side and enables the imaging light to pass through and an image side surface which faces the image side and enables the imaging light to pass through; the first lens element with negative refractive index has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region; the second lens element with positive refractive index has a convex image-side surface at paraxial region; the third lens element with positive refractive index has a concave object-side surface at paraxial region and a convex image-side surface at paraxial region; the fourth lens has positive refraction, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens element with positive refractive power has a concave object-side surface at paraxial region and a convex image-side surface at paraxial region; the sixth lens element with negative refractive index has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region; the seventh lens element has positive refractive index; the object-side surface of the seventh lens element is convex at a paraxial region thereof, and the image-side surface of the seventh lens element is convex at a paraxial region thereof; the fourth lens is made of glass materials, and the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses; the optical imaging lens has only the first lens to the seventh lens.

Further, the optical imaging lens further satisfies: -7.00mm yarn bundles of f1< -5.00mm,50.00mm yarn bundles of f2 < 70.00mm,20.00mm yarn bundles of f3 yarn bundles of 30.00mm,5.00mm yarn bundles of f4 yarn bundles of 15.00mm,8.00mm yarn bundles of f5 yarn bundles of 11.00mm, -6.00mm yarn bundles of f6< -4.00mm and 5.00mm yarn bundles of f7 yarn bundles of 6.5.00mm, wherein f1, f2, f3, f4, f5, f6 and f7 are respectively the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.

Further, the optical imaging lens further satisfies: 1.00< | f1/f | <2.00, 10.00< | f2/f | <20.00,4.00< | f3/f | <8.00,1.00< | f4/f | <4.00,2.00< | f5/f | <3.00,1.00< | f6/f | <2.00,1.00< | f7/f | <2.00, wherein f is the overall focal length of the optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

Further, the optical imaging lens further satisfies: 1.50 yarn-and-1 yarn-woven 1.60, 50.00 yarn-and-1 yarn-and-60.00, 1.60 yarn-and-2 yarn-woven 1.70, 18.00 yarn-and-2 yarn-and-26.00, 1.50 yarn-and-3 yarn-woven 1.70, 50.00 yarn-and-3 yarn-woven 70.00,1.45 yarn-and-4 yarn-woven 1.70, 50.00 yarn-and-4 yarn-and-70.00, 1.50 yarn-and-5 yarn-woven 1.70, 50.00 yarn-and-5 yarn-and-60.00, 1.60 yarn-and-6 yarn-and-1.70, 18.00 yarn-and-26.00, 1.50 yarn-and-7-and-1.60, 50.00-vd7-60.00, where nd1 to nd7 are refractive indices of the first lens to the seventh lens, respectively, and vd1 to vd7 are abbe numbers of the first lens to the seventh lens, respectively.

Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.

Further, the optical imaging lens further satisfies: 2.00<(f _{Front side} /f _{Rear end} )<3.00 of, wherein f _{Front side} Is the combined focal length of the first lens, the second lens and the third lens, f _{Rear end} Is the combined focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens.

Further, the optical imaging lens further satisfies: 4.00< -f67/f <5.60; wherein f67 is a combined focal length of the sixth lens and the seventh lens, and f is an overall focal length of the optical imaging lens.

Further, the optical imaging lens further satisfies: 1.00-woven fabric SD2/SAG2<1.50; where SD2 is the effective aperture of the image-side surface of the first lens and SAG1 is the image-side surface rise of the first lens.

Further, the optical imaging lens further satisfies: TTL/AAG is not less than 7.00, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and AAG is the sum of the air gaps between the first lens and the seventh lens on the optical axis.

Further, the optical imaging lens further satisfies: 1.00 and < -IMH/f <1.50, wherein the IMH is the image side half-image height of the optical imaging lens, and f is the integral focal length of the optical imaging lens.

The invention has the beneficial technical effects that:

the invention adopts the combined design of one glass lens and six plastic aspheric lenses, and by correspondingly designing each lens, the invention has the advantages of shorter overall length of the lens, small volume and low cost; the light transmission is large, the central edge is imaged uniformly, and a dark corner cannot be formed; the distortion is small, the imaging quality is good, and the later correction difficulty is greatly reduced; the temperature drift is small, and the imaging quality is better at high and low temperatures.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;

FIG. 2 is a graph of MTF in visible light at 435-650nm according to one embodiment of the present invention;

FIG. 3 is a 60lp/mm defocus plot in the visible 435-650nm range for one embodiment of the present invention;

FIG. 4 is a graph of lateral chromatic aberration in visible light of 435nm-650nm according to an embodiment of the present invention;

FIG. 5 is a graph of longitudinal chromatic aberration in visible light of 435nm-650nm according to an embodiment of the present invention;

FIG. 6 is a graph showing the field curvature and distortion in visible light at 435-650nm according to one embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 8 is a graph of MTF at 435-650nm according to example II of the present invention;

FIG. 9 is a 60lp/mm defocus graph under 435-650nm visible light in accordance with a second embodiment of the present invention;

FIG. 10 is a graph of lateral chromatic aberration in visible light of 435nm-650nm for the second embodiment of the present invention;

FIG. 11 is a graph of longitudinal chromatic aberration in visible light of 435nm-650nm for the second embodiment of the present invention;

FIG. 12 is a graph showing the field curvature and distortion under visible light of 435-650nm for the second embodiment of the present invention;

FIG. 13 is a schematic structural diagram according to a third embodiment of the present invention;

FIG. 14 is a graph of MTF at 435-650nm in the visible light according to example III of the present invention;

FIG. 15 is a 60lp/mm defocus graph under 435-650nm in the third embodiment of the present invention;

FIG. 16 is a graph showing the lateral chromatic aberration in visible light of 435nm-650nm in the third embodiment of the present invention;

FIG. 17 is a graph of longitudinal chromatic aberration in visible light of 435nm-650nm for the third embodiment of the present invention;

FIG. 18 is a graph showing the field curvature and distortion under 435nm-650nm in visible light according to the third embodiment of the present invention;

FIG. 19 is a schematic structural diagram of a fourth embodiment of the present invention;

FIG. 20 is a graph of MTF at 435-650nm in visible light according to example four of the present invention;

FIG. 21 is a 60lp/mm defocus graph in the visible light of 435-650nm for the fourth embodiment of the present invention;

FIG. 22 is a graph of lateral chromatic aberration in visible light of 435nm-650nm for example four of the present invention;

FIG. 23 is a graph showing the longitudinal chromatic aberration in visible light of 435-650nm in accordance with example four of the present invention;

FIG. 24 is a graph showing the field curvature and distortion under 435nm-650nm in visible light according to the fourth embodiment of the present invention.

Detailed Description

To further illustrate the various embodiments, the present invention provides the accompanying figures. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the drawings and the detailed description.

The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface roughness of the lens can be performed by the determination method of a person who is generally known in the art, that is, by determining the sign of the curvature radius (abbreviated as R value) to determine the surface roughness of the lens. The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. Regarding the object side surface, when the R value is positive, the object side surface is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the value of R is negative, the image side surface is judged to be convex.

The invention discloses an optical imaging lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a fifth lens from an object side to an image side along an optical axis; the first lens element to the seventh lens element each include an object-side surface facing the object side and passing the imaging light and an image-side surface facing the image side and passing the imaging light; the first lens element with negative refractive index has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region; the second lens element with positive refractive index has a convex image-side surface at paraxial region; the third lens element with positive refractive index has a concave object-side surface at paraxial region and a convex image-side surface at paraxial region; the fourth lens has positive refraction, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens element with positive refractive power has a concave object-side surface at paraxial region and a convex image-side surface at paraxial region; the sixth lens element with negative refractive index has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region; the seventh lens element has a positive refractive index; the object-side surface of the seventh lens element is convex at a paraxial region thereof, and the image-side surface of the seventh lens element is convex at a paraxial region thereof; the fourth lens is made of glass materials, and the first lens, the second lens, the third lens, the fifth lens and the sixth lens are all plastic aspheric lenses; the optical imaging lens has only the first lens to the seventh lens.

The invention adopts the combined design of one glass lens and six plastic aspheric lenses, and by correspondingly designing each lens, the invention has the advantages of shorter overall length of the lens, small volume and low cost; the light transmission is large, the central edge is imaged uniformly, and a dark corner cannot be formed; the distortion is small, the imaging quality is good, and the later correction difficulty is greatly reduced; the temperature drift is small, and the imaging quality is better in the temperature range of-40 ℃ to 80 ℃.

Preferably, the optical imaging lens further satisfies: -7.00mm yarn fabric f1< -5.00mm,50.00mm yarn fabric f2 < 70.00mm,20.00mm yarn fabric f3 yarn fabric 30.00mm,5.00mm yarn fabric f4 yarn fabric 15.00mm,8.00mm yarn fabric f5 yarn fabric 11.00mm, 6.00mm yarn fabric f6< -4.00mm and 5.00mm yarn fabric f7 yarn fabric 6.5.00mm, wherein f1, f2, f3, f4, f5, f6 and f7 are respectively the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, so that the optical power distribution of the lenses is uniform and reasonable, and further improves the imaging quality.

Preferably, the optical imaging lens further satisfies: 1.00< | f1/f | <2.00, 10.00< | f2/f | <20.00,4.00< | f3/f | <8.00,1.00< | f4/f | <4.00,2.00< | f5/f | <3.00,1.00< | f6/f | <2.00,1.00< | f7/f | <2.00, wherein f is the overall focal length of the optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens, so that the optical distribution of the lenses is uniform, and the imaging quality is further improved.

Preferably, the optical imaging lens further satisfies: 1.50 yarn-and-1 yarn-bundle 1.60, 50.00 yarn-and-1 yarn-and-1.00, 1.60 yarn-and-2 yarn-and-1.70, 18.00 yarn-and-2 yarn-and-26.00, 1.50 yarn-and-3 yarn-and-1.70, 50.00 yarn-and-3 yarn-and-70, 1.45 yarn-and-4 yarn-and-1.70, 50.00 yarn-and-4 yarn-and-70.00, 1.50 yarn-and-5 yarn-and-1.70, 50.00 yarn-and-5 yarn-and-60.00, 1.60 yarn-and-6 yarn-and-1.70, 18.00 yarn-and-6 yarn-and-26.00, 1.50 yarn-and-7 yarn-and-1.60, 50.00 yarn-and-5 yarn-and-60.00, wherein 1-and-7 are respectively the refractive index of first lens to seventh lens, the color aberration-and the aberration-1-and-7 are respectively optimized as first aberration and second aberration and seventh.

Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens, so that the overall performance is further improved.

More preferably, the optical imaging lens further satisfies: 2.00<(f _{Front side} /f _{Rear end} )<3.00 of, wherein f _{Front side} Is the combined focal length of the first lens, the second lens and the third lens, f _{Rear end} Is a combination of a fourth lens, a fifth lens, a sixth lens and a seventh lensThe focal length ratio of the front group and the rear group is controlled, so that the focal power between the front group and the rear group can be better distributed, the system aberration is reduced, and the imaging quality is improved.

Preferably, the optical imaging lens further satisfies: 4.00< -f67/f <5.60; the f67 is the combined focal length of the sixth lens and the seventh lens, and the f is the integral focal length of the optical imaging lens, so that the focal power of the lens can be better distributed, and chromatic aberration correction of the system is facilitated.

Preferably, the optical imaging lens further satisfies: 1.00-woven fabric SD2/SAG2<1.50; wherein SD2 is the effective aperture of the image side surface of the first lens, and SAG1 is the image side surface rise of the first lens, so that the distortion of the lens can be better controlled, and the low distortion of the lens can be kept.

Preferably, the optical imaging lens further satisfies: TTL/AAG is not less than 7.00, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and AAG is the sum of the air gaps between the first lens and the seventh lens on the optical axis.

Preferably, the optical imaging lens further satisfies: 1.00 and < -IMH/f <1.50, wherein the IMH is the image side half-image height of the optical imaging lens, and f is the integral focal length of the optical imaging lens.

The optical imaging lens of the present invention will be described in detail below with specific embodiments.

Example one

As shown in fig. 1, an optical imaging lens includes, in order along an optical axis I from an object side A1 to an image side A2, a first lens 1, a second lens 2, a third lens 3, a diaphragm 8, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a protective glass 9, and an image plane 100; the first lens element 1 to the seventh lens element 7 each include an object-side surface facing the object side A1 and allowing the imaging light to pass therethrough, and an image-side surface facing the image side A2 and allowing the imaging light to pass therethrough.

The first lens element 1 has negative refractive power, the object-side surface 11 of the first lens element 1 is convex at a paraxial region, the image-side surface 12 of the first lens element 1 is concave at a paraxial region, and more specifically, the object-side surface 11 of the first lens element 1 is convex and the image-side surface 12 of the first lens element 1 is concave.

The second lens element 2 has positive refractive power, the object-side surface 21 of the second lens element 2 is convex in a paraxial region thereof, the image-side surface 22 of the second lens element 2 is convex in a paraxial region thereof, and more specifically, the image-side surface 22 of the second lens element 2 is convex.

The third lens element 3 has positive refractive index, the object-side surface 31 of the third lens element 3 is concave at a paraxial region thereof, the image-side surface 32 of the third lens element 3 is convex at a paraxial region thereof, and more particularly, the image-side surface 32 of the third lens element 3 is convex.

The fourth lens element 4 has positive power, the object-side surface 41 of the fourth lens element 4 is convex, and the image-side surface 42 of the fourth lens element 4 is convex.

The fifth lens element 5 has positive refractive power, the object-side surface 51 of the fifth lens element 5 is concave in a paraxial region thereof, the image-side surface 52 of the fifth lens element 5 is convex in a paraxial region thereof, and more specifically, the object-side surface 51 of the fifth lens element 5 is concave and the image-side surface 52 of the fifth lens element 5 is convex.

The sixth lens element 6 with negative refractive power has a convex object-side surface 61 at a paraxial region of the sixth lens element 6, and a concave image-side surface 62 at a paraxial region of the sixth lens element 6, more specifically, the image-side surface 62 of the sixth lens element 6 is concave.

The seventh lens element 7 has a positive refractive index; the object-side surface 71 of the seventh lens element 7 is convex at a paraxial region, and the image-side surface 72 of the seventh lens element 7 is convex at a paraxial region, more specifically, the object-side surface 71 of the seventh lens element 7 is convex and the image-side surface 72 of the seventh lens element 7 is convex.

The fourth lens 4 is made of glass materials, and the first lens 1, the second lens 2, the third lens 3, the fifth lens 5, the sixth lens 7 and the seventh lens 7 are all plastic aspheric lenses.

In the present embodiment, the diaphragm 8 is disposed between the third lens 3 and the fourth lens 4, but is not limited thereto, and in other embodiments, the diaphragm 8 may be disposed at other suitable positions.

The detailed optical data of this embodiment are shown in Table 1-1.

TABLE 1-1 detailed optical data for example one

In this embodiment, the object side surface 11, the object side surface 21, the object side surface 31, the object side surface 51, the object side surface 61, the object side surface 71, the image side surface 12, the image side surface 22, the image side surface 32, the image side surface 52, the image side surface 62, and the image side surface 72 are defined by the following aspheric curve formulas:

wherein:

r is the distance from a point on the optical surface to the optical axis.

z is the rise of the point in the optical axis direction.

c is the curvature of the surface.

K is the conic constant of the surface.

A ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ Respectively as follows: aspheric coefficients of fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order and sixteenth order.

For details of parameters of each aspheric surface, please refer to the following table:

noodle sequence number

K

A ₄

A ₆

A ₈

A ₁₀

A ₁₂

A ₁₄

A ₁₆

11

-4.86

-3.605E-04

2.434E-05

-2.787E-06

1.858E-07

-7.849E-09

1.872E-10

-1.799E-12

12

-0.58

-6.678E-03

1.092E-03

-7.375E-04

2.463E-04

-4.852E-05

4.878E-06

-2.150E-07

21

-22.29

-2.223E-03

4.068E-04

-1.249E-04

1.129E-05

7.972E-07

-4.024E-07

3.076E-08

22

97.73

-6.911E-03

3.519E-04

8.829E-04

-5.774E-04

1.518E-04

-1.835E-05

8.463E-07

31

64.08

7.079E-04

9.091E-04

1.127E-03

-7.814E-04

2.122E-04

-2.606E-05

1.210E-06

32

-9.27

6.347E-03

1.875E-04

3.095E-04

-1.703E-04

3.381E-05

-1.568E-07

-4.857E-07

51

-11.07

1.483E-02

-2.094E-03

2.723E-04

-4.138E-05

6.205E-06

-6.744E-07

3.259E-08

52

-7.94

-2.835E-03

1.182E-03

-4.748E-04

7.973E-05

-7.875E-06

3.160E-07

3.459E-09

61

-98.73

-1.814E-02

1.067E-03

-1.208E-04

3.467E-05

-6.061E-06

2.502E-07

1.362E-08

62

-7.05

-5.748E-03

7.244E-04

6.395E-06

-1.424E-05

1.908E-06

-1.207E-07

3.173E-09

71

-16.18

1.206E-03

7.232E-04

-2.356E-04

3.272E-05

-2.623E-06

1.090E-07

-1.739E-09

72

-5.08

-6.347E-03

8.987E-04

-1.130E-04

1.068E-05

-6.731E-07

2.325E-08

-3.186E-10

Please refer to table 5 for the values of the conditional expressions related to this embodiment.

The MTF graph of the present embodiment is detailed in fig. 2, it can be seen that the MTF graph is greater than 0.4 in the full field of view under the condition of 125lp/mm, the resolution is high, the defocus graph is shown in fig. 3, the lateral chromatic aberration graph is detailed in fig. 4, the longitudinal chromatic aberration graph is detailed in fig. 5, it can be seen that both chromatic aberration and aberration are corrected well, and the imaging quality is good; the field curvature and distortion diagram are shown in detail in (A) and (B) of FIG. 6, it can be seen that both the field curvature and distortion are better corrected, and the optical distortion is less than or equal to 10%.

In the specific embodiment, the focal length f =4.109mm of the optical imaging lens; field angle FOV =100.0 °; aperture value FNO =2.0; the image space half-image height IMH is 4.406mm; the distance TTL =25.413mm on the optical axis I from the object side surface 11 of the first lens 1 to the imaging surface 100.

The embodiment has better imaging effect in the temperature range of-40 ℃ to 80 ℃.

Example two

As shown in fig. 7, the surface convexo-concave and refractive index of each lens element of this embodiment are substantially the same as those of the first embodiment, only the object-side surface 21 of the second lens element 2 is concave at the paraxial region, and the optical parameters such as the curvature radius and the lens thickness of each lens element surface are different.

The detailed optical data of this example are shown in Table 2-1.

TABLE 2-1 detailed optical data for example two

Surface of		Caliber size/mm	Radius of curvature/mm	Thickness/spacing/mm	Material of	Refractive index	Coefficient of dispersion	Focal length/mm
									-			Infinity	Infinity
11	First lens	11.006	6.920	2.320	K26R	1.54	55.71	-5.957
									12		5.730	1.932	2.655
21	Second lens	5.543	-243.473	2.711	EP8000	1.67	20.38	69.990
									22		4.794	-39.351	0.106
31	Third lens	4.582	-20.206	1.368	K26R	1.54	55.71	23.503
									32		3.963	-7.955	0.311
8	Diaphragm	3.602	Infinity	-0.163
									41	Fourth lens	10.400	9.873	3.363	H-BAK7	1.57	56.04	10.678
42		10.400	-13.951	0.122
									51	Fifth lens element	5.334	-7.235	1.668	K26R	1.54	55.71	9.215
52		5.575	-3.176	0.087
									61	Sixth lens element	5.461	15.367	1.262	EP5000	1.64	23.97	-4.830
62		6.629	2.492	0.311
									71	Seventh lens element	6.742	6.948	3.736	K26R	1.54	55.71	5.520
72		7.746	-4.202	4.315
									9	Cover glass	8.827	Infinity	0.800	H-K9L	1.52	64.20	Infinity
-		8.926	Infinity	0.144
									100	Image plane	8.853	Infinity

For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:

The MTF graph of the present embodiment is detailed in fig. 8, and it can be seen that the MTF graph is greater than 0.35 in the full field under the condition of 125lp/mm, the resolution is high, the defocus graph refers to fig. 9, the transverse chromatic aberration graph refers to fig. 10, the longitudinal chromatic aberration graph refers to fig. 11, and it can be seen that both chromatic aberration and aberration are corrected well, and the imaging quality is good; the field curvature and distortion diagram are shown in detail in (A) and (B) of FIG. 6, it can be seen that both the field curvature and distortion are better corrected, and the optical distortion is less than or equal to 10%.

In this embodiment, the focal length f =4.091mm of the optical imaging lens; field angle FOV =100.0 °; aperture value FNO =1.95; the image space half-image height IMH is 4.406mm; the distance TTL =25.115mm on the optical axis I from the object-side surface 11 of the first lens 1 to the imaging surface 100.

EXAMPLE III

As shown in fig. 13, the lens elements of the present embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.

The detailed optical data of this embodiment is shown in Table 3-1.

TABLE 3-1 detailed optical data for EXAMPLE III

noodle sequence number

K

A ₄

A ₆

A ₈

A ₁₀

A ₁₂

A ₁₄

A ₁₆

11

-4.67

-3.605E-04

2.434E-05

-2.787E-06

1.858E-07

-7.849E-09

1.872E-10

-1.799E-12

12

-0.57

-6.678E-03

1.092E-03

-7.375E-04

2.463E-04

-4.852E-05

4.878E-06

-2.150E-07

21

0.00

-2.030E-03

2.273E-04

-6.441E-05

4.612E-06

1.731E-07

-1.701E-07

1.612E-08

22

182.53

-7.395E-03

6.016E-04

7.814E-04

-5.488E-04

1.483E-04

-1.824E-05

8.528E-07

31

62.69

7.079E-04

9.091E-04

1.127E-03

-7.814E-04

2.122E-04

-2.606E-05

1.210E-06

32

-12.25

6.347E-03

1.875E-04

3.095E-04

-1.703E-04

3.381E-05

-1.568E-07

-4.857E-07

51

-11.16

1.483E-02

-2.094E-03

2.723E-04

-4.138E-05

6.205E-06

-6.744E-07

3.259E-08

52

-7.82

-2.835E-03

1.182E-03

-4.748E-04

7.973E-05

-7.875E-06

3.160E-07

3.459E-09

61

-101.68

-1.814E-02

1.067E-03

-1.208E-04

3.467E-05

-6.061E-06

2.502E-07

1.362E-08

62

-6.99

-5.748E-03

7.244E-04

6.395E-06

-1.424E-05

1.908E-06

-1.207E-07

3.173E-09

71

-16.17

1.206E-03

7.232E-04

-2.356E-04

3.272E-05

-2.623E-06

1.090E-07

-1.739E-09

72

-5.05

-6.347E-03

8.987E-04

-1.130E-04

1.068E-05

-6.731E-07

2.325E-08

-3.186E-10

The MTF graph of the present embodiment is detailed in fig. 14, and it can be seen that the MTF graph is greater than 0.35 in the full field of view under the condition of 125lp/mm, the resolution is high, the defocus graph is shown in fig. 15, the lateral chromatic aberration graph is shown in detail in fig. 16, the longitudinal chromatic aberration graph is shown in detail in fig. 17, and it can be seen that both chromatic aberration and aberration are corrected well, and the imaging quality is good; the field curvature and distortion diagram are shown in detail in (A) and (B) of FIG. 18, it can be seen that both the field curvature and distortion are better corrected, and the optical distortion is less than or equal to 10%.

In the present embodiment, the focal length f =4.107mm of the optical imaging lens; field angle FOV =100.0 °; f-number FNO =2.0; the image space half-image height IMH is 4.406mm; the distance TTL =25.124mm on the optical axis I from the object side surface 11 of the first lens 1 to the imaging surface 100.

Example four

As shown in fig. 19, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.

The detailed optical data of this example are shown in Table 4-1.

TABLE 4-1 detailed optical data for example four

number of noodles

K

A ₄

A ₆

A ₈

A ₁₀

A ₁₂

A ₁₄

A ₁₆

11

-4.58

-3.179E-04

2.584E-05

-2.777E-06

1.847E-07

-7.910E-09

1.861E-10

-1.731E-12

12

-0.58

-5.800E-03

1.124E-03

-7.335E-04

2.474E-04

-4.841E-05

4.878E-06

-2.170E-07

21

2951.32

-2.222E-03

3.868E-04

-1.253E-04

1.061E-05

8.451E-07

-3.816E-07

2.754E-08

22

12.83

-7.093E-03

4.508E-04

8.711E-04

-5.755E-04

1.518E-04

-1.847E-05

8.612E-07

31

58.79

6.400E-04

1.087E-03

1.141E-03

-7.824E-04

2.117E-04

-2.608E-05

1.215E-06

32

-7.86

6.248E-03

3.058E-04

3.273E-04

-1.726E-04

3.319E-05

-3.613E-08

-4.517E-07

51

-8.54

1.522E-02

-2.070E-03

2.711E-04

-4.092E-05

6.240E-06

-6.904E-07

3.334E-08

52

-8.49

-1.081E-03

8.698E-04

-3.861E-04

6.822E-05

-8.337E-06

5.126E-07

-7.843E-09

61

-47.66

-1.712E-02

1.089E-03

-1.262E-04

3.300E-05

-6.210E-06

2.583E-07

1.405E-08

62

-6.93

-4.905E-03

5.065E-04

3.736E-05

-1.764E-05

2.038E-06

-1.179E-07

2.908E-09

71

-14.31

1.409E-03

7.328E-04

-2.366E-04

3.254E-05

-2.620E-06

1.105E-07

-1.771E-09

72

-5.47

-6.373E-03

9.471E-04

-1.148E-04

1.057E-05

-6.342E-07

2.029E-08

-2.059E-10

The MTF graph of the present embodiment is detailed in fig. 20, and it can be seen that the MTF graph is greater than 0.35 in the full field of view under the condition of 125lp/mm, the resolution is high, the defocus graph is shown in fig. 21, the transverse chromatic aberration graph is shown in detail in fig. 22, and the longitudinal chromatic aberration graph is shown in fig. 23, and it can be seen that both chromatic aberration and aberration are corrected well, and the imaging quality is good; the field curvature and distortion diagram are shown in (A) and (B) of FIG. 24, it can be seen that the field curvature and distortion are both better corrected, and the optical distortion is less than or equal to 10%.

In this embodiment, the focal length f =4.106mm of the optical imaging lens; field angle FOV =100.0 °; aperture value FNO =1.97; the image space half-image height IMH is 4.406mm; the distance TTL =24.732mm on the optical axis I from the object-side surface 11 of the first lens 1 to the imaging surface 100.

TABLE 5 values of relevant important parameters for four embodiments of the invention

	Example one	Example two	EXAMPLE III	Example four
					IMH/f	1.07	1.08	1.07	1.07
f _{Front side} /f _{Rear end}	2.158	2.122	2.023	2.309
					f67/f	4.67	5.52	4.87	5.58
TTL/AAG	7.43	7.32	7.46	7.103
					SD2/SAG2	2.463	2.392	2.501	2.395

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens respectively comprise an object side surface which faces the object side and enables the imaging light to pass through and an image side surface which faces the image side and enables the imaging light to pass through; the method is characterized in that:

the first lens element with negative refractive index has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;

the second lens element with positive refractive index has a convex image-side surface at paraxial region;

the third lens element with positive refractive index has a concave object-side surface at paraxial region and a convex image-side surface at paraxial region;

the fourth lens has positive refraction, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;

the fifth lens element with positive refractive power has a concave object-side surface at paraxial region and a convex image-side surface at paraxial region;

the sixth lens element with negative refractive index has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;

the seventh lens element has positive refractive index; the object-side surface of the seventh lens element is convex at a paraxial region thereof, and the image-side surface of the seventh lens element is convex at a paraxial region thereof;

the fourth lens is made of glass materials, and the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses;

the optical imaging lens has only the first lens to the seventh lens.

2. The optical imaging lens of claim 1, further satisfying: -7.00mm < -f 1< -5.00mm, <50.00mm < -f 2< 70.00mm, <20.00mm < -f 3< -30.00mm, <5.00mm < -f 4< -15.00mm, <8.00mm < -f 5< -11.00mm, -6.00mm < -f 6< -4.00mm, <5.00mm < -f 7< -6.5.00mm, wherein f1, f2, f3, f4, f5, f6 and f7 are the focal lengths of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, respectively.

3. The optical imaging lens of claim 1, characterized in that it further satisfies: 1.00< | f1/f | <2.00, 10.00< | f2/f | <20.00,4.00< | f3/f | <8.00,1.00< | f4/f | <4.00,2.00< | f5/f | <3.00,1.00< | f6/f | <2.00,1.00< | f7/f | <2.00, wherein f is the overall focal length of the optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

4. The optical imaging lens of claim 1, further satisfying: 1.50 yarn-and-1 yarn-woven 1.60, 50.00 yarn-and-1 yarn-and-60.00, 1.60 yarn-and-2 yarn-woven 1.70, 18.00 yarn-and-2 yarn-and-26.00, 1.50 yarn-and-3 yarn-woven 1.70, 50.00 yarn-and-3 yarn-woven 70.00,1.45 yarn-and-4 yarn-woven 1.70, 50.00 yarn-and-4 yarn-and-70.00, 1.50 yarn-and-5 yarn-woven 1.70, 50.00 yarn-and-5 yarn-and-60.00, 1.60 yarn-and-6 yarn-and-1.70, 18.00 yarn-and-26.00, 1.50 yarn-and-7-and-1.60, 50.00-vd7-60.00, where nd1 to nd7 are refractive indices of the first lens to the seventh lens, respectively, and vd1 to vd7 are abbe numbers of the first lens to the seventh lens, respectively.

5. The optical imaging lens of claim 1, further comprising a diaphragm disposed between the third lens and the fourth lens.

6. The optical imaging lens of claim 5, further satisfying: 2.00<(f _{Front side} /f _{Rear end} )<3.00 of, wherein f _{Front side} Is the combined focal length of the first lens, the second lens and the third lens, f _{Rear end} Is the combined focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens.

7. The optical imaging lens of claim 1, characterized in that it further satisfies: 4.00< -f67/f <5.60; wherein f67 is a combined focal length of the sixth lens and the seventh lens, and f is an overall focal length of the optical imaging lens.

8. The optical imaging lens of claim 1, further satisfying: 1.00 n & lt SD2/SAG2 & lt 1.50; where SD2 is the effective aperture of the image-side surface of the first lens, and SAG1 is the image-side surface rise of the first lens.

9. The optical imaging lens of claim 1, characterized in that it further satisfies: TTL/AAG is not less than 7.00, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and AAG is the sum of the air gaps of the first lens and the seventh lens on the optical axis.

10. The optical imaging lens of claim 1, characterized in that it further satisfies: 1.00 and is woven with an IMH/f <1.50, wherein the IMH is the image half-image height of the optical imaging lens, and the f is the integral focal length of the optical imaging lens.