CN115728914A

CN115728914A - Optical imaging lens

Info

Publication number: CN115728914A
Application number: CN202211444363.5A
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: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-03-03
Anticipated expiration: 2042-11-18
Also published as: CN115728914B

Abstract

The invention relates to the technical field of lenses. The invention discloses an optical imaging lens, which comprises six lenses, wherein a first lens is a convex-concave lens with negative refractive index, a second lens has negative refractive index, the object side surface at the paraxial region is a convex surface, the image side surface is a concave surface, a third lens, a fourth lens and a sixth lens are convex-convex lenses with positive refractive index, a fifth lens has negative refractive index, the object side surface is a concave surface, the first lens and the third lens are glass spherical lenses, the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspheric lenses, and the optical imaging lens meets the following requirements: r11<13.50mm and R11-R12<9.50mm. The invention has the advantages of short overall length of the lens, small volume and low cost; large field angle, 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 improvement of living standard, in recent years, the optical imaging lens has also been rapidly developed, and the optical imaging lens is widely applied to various fields such as smart phones, tablet computers, vehicle monitoring, security monitoring, unmanned aerial vehicle aerial photography, machine vision systems, video conferences 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 defects, such as too large total optical length (TTL) and too many lenses, so that the overall cost and weight of the lens are too high, and the installation and use of the lens are limited; in order to improve resolution and correct chromatic aberration, the optical imaging lens with a large field angle mostly adopts a plurality of glass or cemented lenses, and has the defects of high cost and overlarge volume; the lens temperature drift amount is large, and when the temperature disturbance is too large, the imaging quality and the like are affected, so that the improvement is necessary to meet the increasing requirements 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, a fifth lens and a sixth 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 and a concave image-side surface;

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

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

the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;

the fifth lens element has a negative refractive index, and the object-side surface of the fifth lens element is concave;

the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;

the first lens and the third lens are both glass spherical lenses, and the second lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspheric lenses;

the optical imaging lens has a lens with a refractive index only comprising the first lens, the second lens and the third lens;

the optical imaging lens satisfies the following conditions: r11<13.50mm and R11-R12<9.50mm, wherein R11 and R12 are the radii of curvature of the object-side surface and the image-side surface of the first lens, respectively.

Further, the optical imaging lens further satisfies: -7.50mm yarn bundles of f1< -5.00mm, -3.00mm < f2< -2.00mm,3.00mm yarn bundles of f3 4.00mm,2.00mm yarn bundles of f4 yarn bundles of 3.00mm, -3.00mm yarn bundles of f5< -1.00mm,2.50mm yarn bundles of f6 yarn bundles of 3.50mm, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, respectively.

Further, the optical imaging lens further satisfies: 4.00< | f1/f | <6.00,1.50< | f2/f | <3.00,2.00< | f3/f | <3.00,1.50< | f4/f | <2.50,1.00< | f5/f | <2.00,1.00< | f6/f | <3.00, 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, and f6 is the focal length of the sixth lens.

Further, the optical imaging lens further satisfies: 1.80 yarn-woven 1 yarn-woven 2.00, 20.00 yarn-woven vd1 yarn-woven 50.00;1.50 yarn-woven 2 yarn-woven 1.70, 50.00 yarn-woven vd2 yarn-woven 60.00;1.70 yarn and 3 yarn are 1.90, 19.00 yarn and vd3 yarn 30.00;1.50 yarn-woven 4 yarn-woven 1.70, 50.00 yarn-woven vd4 yarn-woven 70.00;1.50 yarn-woven 5 yarn-woven 1.70, 15.00 yarn-woven vd5 yarn-woven 25.00; 1.50-n-d 6-n-1.70, 50.00-n-v 6-n 60.00, wherein nd1-nd6 are refractive indices of the first lens to the sixth lens, respectively, and vd1-vd6 are abbe numbers of the first lens to the sixth lens, respectively.

Further, the optical imaging lens further satisfies: 0.80< (CT 4+ CT 5)/CT 6<1.10, wherein CT4, CT5 and CT6 are thicknesses of the fourth lens, the fifth lens and the sixth lens, respectively, on the optical axis.

Further, the optical imaging lens further satisfies: | f12/f3 | <0.50, where f12 is the focal length of the first lens element and the second lens element, and f3 is the focal length of the third lens element.

Further, the optical imaging lens further satisfies: 5.00< | f45/f | is <16.00, wherein f45 is the combined focal length of the fourth and fifth lenses, and f is the overall focal length of the optical imaging lens.

Further, the second lens, the fourth lens, the fifth lens and the sixth lens are all high-order even-order aspheric lenses.

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: TTL is less than 17.00mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.

The invention has the beneficial technical effects that:

the invention adopts the combined design of two glass spherical lenses and four plastic non-spherical lenses, and by correspondingly designing each lens, the invention has the advantages of shorter overall length of the lens, small volume, convenient installation and use and low cost; the field angle is large (more than 195.0 degrees), and the imaging quality is good; small temperature drift and can well keep the working state at various 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 showing the longitudinal chromatic aberration in visible light of 435-650nm 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 according to 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 in the 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 showing the longitudinal chromatic aberration in visible light of 435-650nm in accordance with the second embodiment of the present invention;

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

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

FIG. 14 is a graph of MTF at 435-650nm in visible light according to the third embodiment 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 in accordance with the third embodiment of the present invention.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. 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 shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). 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 sheet (lens data sheet) of optical design software. When the R value is positive, the object side 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 R value 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 and a fourth lens from an object side to an image side along an optical axis; the first lens element to the sixth lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.

The first lens element with negative refractive index has a convex object-side surface and a concave image-side surface.

The second lens element with negative refractive index has a convex object-side surface at paraxial region and a concave image-side surface.

The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface.

The fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.

The fifth lens element has a negative refractive index, and the object-side surface of the fifth lens element is concave.

The sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.

The first lens and the third lens are both glass spherical lenses, and the second lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspheric lenses, so that secondary spectrum and high-level aberration can be corrected, the temperature drift of the lens can be corrected well, and the working states under different temperature conditions can be guaranteed well.

The optical imaging lens has only the first lens element to the sixth lens element with refractive index.

The optical imaging lens satisfies the following conditions: r11 is less than 13.50mm and R11-R12 is less than 9.50mm, wherein R11 and R12 are respectively the curvature radius of the object side surface and the image side surface of the first lens, so that the field angle of the optical imaging lens can be better ensured to be larger than 195.0 degrees, the whole field range of the lens is enlarged, and the practicability is improved.

The invention adopts the combined design of two glass spherical lenses and four plastic non-spherical lenses, and by correspondingly designing each lens, the invention has the advantages of shorter overall length of the lens, small volume, convenient installation and use and low cost; the field angle is larger than 195.0 degrees, the whole field range of the lens is improved, and the practicability is improved; the imaging quality is good; small temperature drift and can well keep the working state at various temperatures.

Preferably, the optical imaging lens further satisfies: -7.50mm < -f 1< -5.00mm, -3.00mm < f2< -2.00mm, <3.00mm < -3 < -4.00mm, 2.00mm < -f 4< -3.00mm, -3.00mm < -5 < -1.00mm,2.50mm < -6 < -3.50mm, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively, so that the distribution of the optical powers of the respective lenses is uniform and reasonable, and further the imaging quality is improved.

Preferably, the optical imaging lens further satisfies: 4.00< | f1/f | <6.00,1.50< | f2/f | <3.00,2.00< | f3/f | <3.00,1.50< | f4/f | <2.50,1.00< | f5/f | <2.00,1.00< | f6/f | <3.00, 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, and f6 is the focal length of the sixth lens, so that the focal powers of the respective lenses are uniformly and reasonably distributed, and the imaging quality is further improved.

Preferably, the optical imaging lens further satisfies: 1.80 yarn-woven 1 yarn-woven 2.00, 20.00 yarn-woven vd1 yarn-woven 50.00;1.50 yarn-woven 2 yarn-woven 1.70, 50.00 yarn-woven vd2 yarn-woven 60.00;1.70 yarn-woven 3 yarn-woven 1.90, 19.00 yarn-woven vd3 yarn-woven 30.00;1.50 yarn-woven 4 yarn-woven 1.70, 50.00 yarn-woven vd4 yarn-woven 70.00;1.50 yarn-woven 5 yarn-woven 1.70, 15.00 yarn-woven vd5 yarn-woven 25.00;1.50 and 6 are constructed of 1.70 and 50.00 and vsd 6 are constructed of 60.00, wherein nd1-nd6 are refractive indexes of a first lens to a sixth lens respectively, and vd1-vd6 are dispersion coefficients of the first lens to the sixth lens respectively, so that chromatic aberration and aberration are further optimized, and imaging quality is improved; and the first lens and the third lens are made of glass materials with high refractive index and low dispersion coefficient, so that the optical structure can be better optimized, the structural design of the lens is facilitated, the total length of the lens is reduced, and the cost of the lens is reduced.

Preferably, the optical imaging lens further satisfies: 0.80< (CT 4+ CT 5)/CT 6<1.10, wherein CT4, CT5 and CT6 are thicknesses of a fourth lens, a fifth lens and a sixth lens on an optical axis respectively, and the central thicknesses of the three rear lenses are reasonably distributed, so that the miniaturization design of the lens is facilitated; meanwhile, the focal power of the rear group can be better distributed by adjusting the ratio of the lenses, and the astigmatism of the lens can be corrected.

Preferably, the optical imaging lens further satisfies: f12/f3 | <0.50, wherein f12 is the combined focal length of the first lens element and the second lens element, and f3 is the focal length of the third lens element. The optical system can have better imaging effect under the condition of large angle.

Preferably, the optical imaging lens further satisfies: 5.00< | f45/f | is <16.00, wherein f45 is the combined focal length of the fourth and fifth lenses, and f is the overall focal length of the optical imaging lens. The aberration correction of the optical system is facilitated, and the imaging resolution of the lens is improved.

Preferably, the second lens, the fourth lens, the fifth lens and the sixth lens are all high-order even-order aspheric lenses, so that chromatic aberration and aberration are further optimized, and imaging quality is improved.

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.

Preferably, the optical imaging lens further satisfies: TTL is less than 17.00mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and the volume of the lens is effectively reduced.

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 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, a protective glass 8, and an imaging surface 9; the first lens element 1 to the sixth lens element 6 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 a negative refractive index, and an object-side surface 11 and an image-side surface 12 of the first lens element 1 are convex and concave, respectively.

The second lens element 2 has negative refractive index, the object-side surface 21 of the second lens element 2 is convex at paraxial region, and the image-side surface 22 of the second lens element 2 is concave.

The third lens element 3 has a positive refractive index, and an object-side surface 31 of the third lens element 3 is convex and an image-side surface 32 of the third lens element 3 is convex.

The fourth lens element 4 has a positive refractive index, and an object-side surface 41 and an image-side surface 42 of the fourth lens element 4 are convex and substantially parallel to each other.

The fifth lens element 5 has negative refractive index, 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 at paraxial region.

The sixth lens element 6 has a positive refractive index, and an object-side surface 61 of the sixth lens element 6 is convex and an image-side surface 62 of the sixth lens element 6 is convex.

The first lens 1 and the third lens 3 are both glass spherical lenses, and the second lens 2, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are all plastic aspheric lenses.

In the present embodiment, the diaphragm 7 is disposed between the third lens 3 and the fourth lens 4, but the present invention is not limited thereto, and in other embodiments, the diaphragm 7 may be disposed at another suitable position.

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 21, the object side surface 41, the object side surface 51, the object side surface 61, the image side surface 22, the image side surface 42, the image side surface 52, and the image side surface 62 are defined by the following aspheric curve formula:

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: fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth aspheric coefficients.

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

21

78.33

-1.650E-02

5.925E-03

-1.772E-03

3.351E-04

-3.792E-05

2.349E-06

-6.156E-08

22

-0.99

-2.404E-02

1.772E-02

-9.635E-03

2.685E-03

-3.394E-04

1.183E-05

3.815E-07

41

2.47

-1.777E-02

2.032E-03

-5.324E-02

7.036E-02

-2.889E-02

-2.810E-02

1.880E-02

42

-1.15

-9.155E-03

-4.762E-02

-3.262E-02

3.476E-02

3.987E-02

-5.153E-02

1.452E-02

51

-0.43

3.154E-01

-2.718E-01

1.019E-01

6.137E-02

-4.897E-02

-3.898E-04

5.132E-03

52

-233.96

8.392E-02

-2.882E-02

1.914E-03

5.191E-03

-1.939E-03

-2.836E-06

6.257E-05

61

-14.88

4.532E-03

-4.896E-03

2.117E-03

1.714E-05

-1.251E-04

2.333E-05

-1.381E-06

62

-0.82

1.521E-03

-1.727E-03

1.522E-03

-4.971E-04

8.353E-05

-7.857E-06

7.061E-07

Please refer to table 4 for the values of the conditional expressions related to this embodiment.

The MTF graph of the present embodiment is detailed in fig. 2, and it can be seen that the MTF graph is greater than 0.4 in the full field under the condition of 84lp/mm, the resolution is high, and the imaging quality is good; referring to fig. 3, a transverse chromatic aberration diagram is shown in detail in fig. 4, and a longitudinal chromatic aberration diagram is shown in detail in fig. 5, so that chromatic aberration and aberration are both corrected well, and imaging quality is high; the field curvature and distortion are shown in detail in (a) and (B) of fig. 6, and it can be seen that both the field curvature and distortion are better corrected.

In this embodiment, the focal length f =1.336mm of the optical imaging lens; field angle FOV =196.0 °; aperture value FNO =2.0; the distance TTL =16.388mm on the optical axis I from the object-side surface 11 of the first lens 1 to the imaging surface 9.

The present embodiment can well maintain the operating state at various temperatures.

Example two

As shown in fig. 7, the surface convexoconcave and the refractive index of each lens element of this embodiment are substantially the same as those of the first embodiment, only the image-side surface 52 of the fifth lens element 5 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	11.927	12.123	1.099	Glass	1.91	31.32	-5.800
									12		6.457	3.515	2.069
21	Second lens	6.230	9.801	1.009	Plastic material	1.54	55.98	-3.000
									22		3.808	1.340	1.854
31	Third lens	6.000	3.825	3.185	Glass	1.77	26.61	3.878
									32		6.000	-8.539	0.131
7	Diaphragm	1.934	Infinity	0.134
									41	Fourth lens	2.256	3.640	1.300	Plastic material	1.55	56.00	2.226
42		2.611	-1.596	0.081
									51	Fifth lens element	2.576	-2.001	0.541	Plastic material	1.67	20.38	-1.479
52		3.068	2.158	0.177
									61	Sixth lens element	3.501	2.802	2.062	Plastic material	1.54	55.71	2.683
62		4.299	-2.206	1.489
									8	Cover glass	5.294	Infinity	0.700	Glass	1.52	64.20	Infinity
-		5.485	Infinity	0.203
									9	Image plane	5.613	Infinity	0.000

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

number of noodles

K

A ₄

A ₆

A ₈

A ₁₀

A ₁₂

A ₁₄

A ₁₆

21

-20.57

3.816E-04

2.239E-03

-1.583E-03

3.781E-04

-4.520E-05

2.748E-06

-6.764E-08

22

-0.81

-1.707E-02

2.189E-02

-1.192E-02

-1.209E-03

2.704E-03

-7.839E-04

7.398E-05

41

0.02

-6.955E-03

2.687E-02

-5.071E-02

3.403E-02

-2.261E-03

-1.248E-02

3.788E-03

42

-8.04

-6.326E-02

1.862E-02

-2.290E-02

-2.641E-02

3.590E-02

-1.452E-02

2.104E-03

51

1.05

3.922E-02

-8.584E-03

-3.752E-02

3.375E-02

-1.291E-02

5.343E-03

-2.300E-04

52

-19.03

1.716E-02

-2.714E-03

-5.237E-03

4.515E-03

-9.707E-04

-7.823E-05

4.661E-05

61

-26.25

2.608E-02

-1.206E-02

1.332E-03

6.794E-04

-2.917E-04

2.437E-05

3.472E-06

62

-0.54

2.404E-02

-1.972E-03

1.233E-04

3.445E-05

-1.948E-05

1.246E-06

-7.934E-09

The MTF graph of the specific embodiment is shown in detail in FIG. 8, and it can be seen that the MTF graph is larger than 0.5 in the full field of view under the condition of 84lp/mm, the resolution is high, and the imaging quality is good; please refer to fig. 9 for a defocusing graph, fig. 10 for a transverse chromatic aberration diagram, and fig. 11 for a longitudinal chromatic aberration diagram, which shows that chromatic aberration and aberration are both corrected well and imaging quality is high; the field curvature and distortion are shown in detail in (a) and (B) of fig. 12, and it can be seen that both the field curvature and distortion are better corrected.

In this embodiment, the focal length f =1.348mm of the optical imaging lens; field angle FOV =195.6 °; aperture value FNO =2.0; the distance TTL =16.033mm on the optical axis I from the object-side surface 11 of the first lens 1 to the imaging surface 9.

EXAMPLE III

As shown in fig. 13, the surface convexes and concaves and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens 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

Surface of		Caliber size/mm	Radius of curvature/mm	Thickness/spacing/mm	Material quality	Refractive index	Coefficient of dispersion	Focal length/mm
									-			Infinity	Infinity
11	First lens	14.082	13.405	1.195	Glass	1.92	35.28	-6.887
									12		7.803	4.105	3.125
21	Second lens	6.628	20.891	1.065	Plastic material	1.54	55.98	-2.563
									22		4.207	1.272	1.091
31	Third lens	6.000	3.708	3.050	Glass	1.85	23.78	3.638
									32		6.000	-11.815	0.397
7	Diaphragm	1.779	Infinity	-0.008
									41	Fourth lens	2.151	3.240	1.361	Plastic material	1.55	56.00	2.384
42		2.581	-1.854	0.120
									51	Fifth lens element	2.542	-1.132	0.507	Plastic material	1.67	20.38	-1.950
52		3.116	-10.290	0.100
									61	Sixth lens element	4.348	2.364	2.163	Plastic material	1.55	56.00	2.875
62		4.708	-3.168	1.436
									8	Cover glass	5.549	Infinity	0.700	Glass	1.52	64.20	Infinity
-		5.734	Infinity	0.203
									9	Image plane	5.680	Infinity	0.000

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

noodle sequence number

K

A ₄

A ₆

A ₈

A ₁₀

A ₁₂

A ₁₄

A ₁₆

21

37.16

-1.386E-02

5.627E-03

-1.712E-03

3.044E-04

-3.171E-05

1.801E-06

-4.332E-08

22

-0.89

-2.183E-02

1.863E-02

-1.050E-02

2.600E-03

-2.901E-04

1.697E-05

-1.233E-06

41

2.03

-1.933E-02

2.853E-02

-8.797E-02

9.735E-02

-1.949E-02

-5.569E-02

2.827E-02

42

-2.51

3.451E-03

-8.067E-02

-1.386E-02

2.320E-02

3.999E-02

-5.311E-02

1.636E-02

51

-0.59

3.116E-01

-2.991E-01

9.994E-02

6.918E-02

-5.716E-02

-9.090E-03

1.182E-02

52

-93.15

9.569E-02

-3.575E-02

1.908E-03

6.004E-03

-2.142E-03

-1.132E-04

1.143E-04

61

-20.16

2.039E-02

-7.477E-03

1.610E-03

8.118E-05

-1.178E-04

2.444E-05

-1.715E-06

62

-0.77

-2.522E-04

1.233E-03

8.673E-04

-4.288E-04

8.953E-05

-1.048E-05

6.587E-07

The MTF graph of the present embodiment is shown in detail in fig. 14, and it can be seen that the MTF graph is greater than 0.5 in the full field of view under the condition of 84lp/mm, the resolution is high, and the imaging quality is good; referring to fig. 15, a transverse chromatic aberration diagram is shown in detail in fig. 16, and a longitudinal chromatic aberration diagram is shown in detail in fig. 11, it can be seen that chromatic aberration and aberration are both corrected well, and imaging quality is high; the field curvature and distortion are shown in detail in (a) and (B) of fig. 18, and it can be seen that both the field curvature and distortion are better corrected.

In this specific embodiment, the focal length f =1.343mm of the optical imaging lens; field angle FOV =195.9 °; aperture value FNO =2.0; the distance TTL =16.503mm on the optical axis I from the object-side surface 11 of the first lens 1 to the imaging surface 9.

TABLE 4 values of relevant important parameters for three embodiments of the invention

	Example one	Example two	EXAMPLE III
				f1	-6.887	-5.800	-6.887
f2	-2.575	-3.000	-2.563
				f3	3.657	3.878	3.638
f4	2.393	2.226	2.384
				f5	-2.309	-1.479	-1.950
f6	3.299	2.683	2.875
				f	1.336	1.348	1.343
\|f1/f\|	5.155	4.302	5.128
				\|f2/f\|	1.927	2.226	1.909
\|f3/f\|	2.737	2.877	2.709
				\|f4/f\|	1.791	1.651	1.775
\|f5/f\|	1.729	1.097	1.452
				\|f6/f\|	2.469	1.991	2.141
(CT4+CT5)/CT6	0.977	0.892	0.8635
				│f12/f3│	0.375	0.394	0.372
│f45/f│	15.353	10.337	12.056
				R11-R12	8.617	8.608	9.299

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 are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through; the method is characterized in that:

the fifth lens element has negative refractive index, and the object-side surface of the fifth lens element is concave;

the optical imaging lens has only the first lens to the sixth lens with refractive index;

the optical imaging lens satisfies the following conditions: r11<13.50mm and R11-R12<9.50mm, where R11 and R12 are radii of curvature of the object-side surface and the image-side surface of the first lens, respectively.

2. The optical imaging lens of claim 1, further satisfying: -7.50mm yarn bundles of f1< -5.00mm, -3.00mm < f2< -2.00mm,3.00mm yarn bundles of f3 4.00mm,2.00mm yarn bundles of f4 yarn bundles of 3.00mm, -3.00mm yarn bundles of f5< -1.00mm,2.50mm yarn bundles of f6 yarn bundles of 3.50mm, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, respectively.

3. The optical imaging lens of claim 1, characterized in that it further satisfies: 4.00< | f1/f | <6.00,1.50< | f2/f | <3.00,2.00< | f3/f | <3.00,1.50< | f4/f | <2.50,1.00< | f5/f | <2.00,1.00< | f6/f | <3.00, 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, and f6 is the focal length of the sixth lens.

4. The optical imaging lens of claim 1, further satisfying: 1.80 yarn-woven 1 yarn-woven 2.00, 20.00 yarn-woven vd1 yarn-woven 50.00;1.50 yarn-woven 2 yarn-woven 1.70, 50.00 yarn-woven vd2 yarn-woven 60.00;1.70 yarn and 3 yarn are 1.90, 19.00 yarn and vd3 yarn 30.00;1.50 nland4 nlans 1.70 and 50.00 nland4 nlans 70.00;1.50 nla and 5 nla 1.70, 15.00 nla vd5 nla 25.00; 1.50-n-d 6-n-1.70, 50.00-n-v 6-n 60.00, wherein nd1-nd6 are refractive indices of the first lens to the sixth lens, respectively, and vd1-vd6 are abbe numbers of the first lens to the sixth lens, respectively.

5. The optical imaging lens of claim 1, characterized in that it further satisfies: 0.80< (CT 4+ CT 5)/CT 6<1.10, wherein CT4, CT5 and CT6 are thicknesses of the fourth lens, the fifth lens and the sixth lens, respectively, on the optical axis.

6. The optical imaging lens of claim 1, further satisfying: | f12/f3 | <0.50, where f12 is the focal length of the first lens element and the second lens element, and f3 is the focal length of the third lens element.

7. The optical imaging lens of claim 1, further satisfying: 5.00< | f45/f | is <16.00, wherein f45 is the combined focal length of the fourth and fifth lenses, and f is the overall focal length of the optical imaging lens.

8. The optical imaging lens assembly of claim 1, wherein the second lens element, the fourth lens element, the fifth lens element and the sixth lens element are all high order even-order aspheric lens elements.

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

10. The optical imaging lens of claim 1, characterized in that it further satisfies: TTL is less than 17.00mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.