CN217718237U - Optical imaging lens - Google Patents

Abstract

The present invention relates to the field of lens technology, and more particularly, to an optical imaging lens, which comprises, in order from an object side to an image side, a first lens element to a sixth lens element along an optical axis; the first lens and the fourth 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 first lens is a convex-concave lens with negative diopter, the second lens is a concave-concave lens with negative diopter, the third lens is a convex-concave lens with positive diopter, the fourth lens is a convex-convex lens with positive diopter, the fifth lens is a convex-concave lens with negative diopter, and the sixth lens is a convex-convex lens with positive diopter. The lens has small integral volume, low cost and convenient installation and use; the distortion control is perfect, the edge deformation of the shot picture is small, and the later image processing is facilitated; the imaging target surface is large, the photosensitive performance is better, and the imaging signal-to-noise ratio is low; the contrast is high, the image surface brightness is uniform, and the edge imaging phenomenon can not appear darker and fuzzy.

Description

Optical imaging lens

Technical Field

The utility model relates to a camera lens technical field especially relates to an optical imaging camera lens.

Background

With the continuous progress of scientific technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed, are widely applied to various fields such as smart phones, tablet computers, consumer cameras, video conferences, vehicle-mounted monitoring, security monitoring, machine vision and the like, and have higher and higher requirements on the optical imaging lenses.

However, optical imaging lenses on the market at present have many defects, wherein, in order to improve resolution and correct chromatic aberration, large-field-angle lenses are mostly composed of a plurality of glass or cemented lenses, which results in high cost and large volume; the shot images have obvious deformation due to poor control of lens edge distortion, so that the later image processing is influenced; the imaging target surface is small, the signal-to-noise ratio is high, and the photosensitivity is poor; the defects of low relative illumination and dark edge, unclear imaging of the edge position and the like cannot meet the increasing requirements, and the improvement is urgently needed.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one problem in the above-mentioned problem, the utility model provides an optical imaging lens.

Specifically, the technical scheme of the utility model is:

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

the first lens has negative diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens has negative diopter, the object side surface of the second lens is a concave surface at the position close to the optical axis, and the image side surface of the second lens is a concave surface;

the third lens has positive diopter, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;

the fourth lens has positive diopter, 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 has negative diopter, the object side surface of the fifth lens is a convex surface at the position close to the optical axis, and the image side surface of the fifth lens is a concave surface;

the sixth lens element has a positive refractive power, an object-side surface of the sixth lens element is a convex surface, and an image-side surface of the sixth lens element is a convex surface.

Preferably, the optical module further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.

Preferably, the optical imaging lens satisfies: -20.000mm < f1 < -30.000mm, -5.000mm < f2 < -7.000mm,13.000mm < f3 < 17.000mm,5.000mm < f4 < 8.000mm, -4.000mm < f5 < -6.000mm,4.000mm < f6 < 6.000mm, wherein f1, f2, f3, f4, f5, f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, respectively.

Preferably, the optical imaging lens satisfies: 6.500 < | f1/f | < 9.000,1.000 < | f2/f | < 2.500,3.500 < | f3/f | < 5.000,1.000 < | f4/f | < 2.500,1.000 < | f5/f | < 2.000,1.000 < | f6/f | < 2.000, wherein f is the effective 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.

Preferably, the optical imaging lens satisfies: nd1 is more than 1.60 and less than 1.90, vd1 is more than 45.00 and less than 60.00; nd2 is more than 1.50 and less than 1.70, and vd2 is more than 50.00 and less than 60.00; nd3 is more than 1.60 and less than 1.90, vd3 is more than 19.00 and less than 30.00; nd4 is more than 1.50 and less than 1.80, and vd4 is more than 50.00 and less than 70.00; nd5 is more than 1.60 and less than 1.70, vd5 is more than 18.00 and less than 25.00; nd6 is more than 1.50 and less than 1.70, and vd6 is more than 50.00 and less than 60.00; and nd1, nd2, nd3, nd4, nd5 and nd6 are refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively, and vd1, vd2, vd3, vd4, vd5 and vd6 are Abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively.

Preferably, the optical imaging lens satisfies: 2.000 < | f₁₂₃/f₄₅₆< 3.000, wherein f₁₂₃Is the combined focal length of the first lens, the second lens and the third lens, f₄₅₆Is the combined focal length of the fourth lens, the fifth lens and the sixth lens.

Preferably, the optical imaging lens satisfies: the outer diameter of any one of the first lens to the sixth lens is smaller than 20mm.

Preferably, the optical imaging lens satisfies: TTL is less than 29.000mm, and f is less than 3.700mm, wherein TTL is the optical total length of the optical imaging lens, and f is the effective focal length of the optical imaging lens.

The utility model has the advantages of that:

the optical imaging lens provided by the utility model adopts six lenses, two glass lenses and four plastic aspheric lenses are designed in a combined way, and each lens is correspondingly designed, so that the overall size of the lens is small, the cost is low, and the installation and the use are convenient; the distortion control is perfect, the edge deformation of the shot picture is small, and the post-image processing is facilitated; the imaging target surface is large, the photosensitive performance is better, and the imaging signal-to-noise ratio is low; high contrast, uniform image surface brightness, and no dark and fuzzy phenomena in edge imaging.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment;

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

FIG. 3 is a defocus graph of the embodiment in the visible light range from 435nm to 650 nm;

FIG. 4 is a graph showing lateral chromatic aberration in visible light of 435nm-650nm according to an example;

FIG. 5 is a graph showing longitudinal chromatic aberration in the visible light range from 435nm to 650nm according to one embodiment;

FIG. 6 is a graph showing the field curvature and distortion under 435-650 nm in visible light according to an embodiment;

FIG. 7 is a graph of relative illumination in the visible 435-650 nm range according to one embodiment;

FIG. 8 is a schematic structural view of the second embodiment;

FIG. 9 is a graph of MTF at 435nm-650nm in visible light for example two;

FIG. 10 is the defocus graph of example two at 435-650 nm in visible light;

FIG. 11 is a graph of lateral chromatic aberration for example two at 435nm-650nm in visible light;

FIG. 12 is a graph showing the longitudinal chromatic aberration in the visible light range from 435nm to 650nm in the second embodiment;

FIG. 13 is a graph of field curvature and distortion under visible light of 435nm-650nm for the second embodiment;

FIG. 14 is a graph of relative illuminance between 435nm and 650nm in visible light for example two;

FIG. 15 is a schematic structural view of the third embodiment;

FIG. 16 is a graph of MTF at 435nm-650nm in visible light for example three;

FIG. 17 is the defocus graph of example III in the visible light range from 435nm to 650 nm;

FIG. 18 is a graph of lateral chromatic aberration for example III in the visible light range from 435nm to 650 nm;

FIG. 19 is a graph showing the longitudinal chromatic aberration in visible light of 435nm-650nm in the third embodiment;

FIG. 20 is a graph showing the field curvature and distortion under 435nm-650nm in the case of the third embodiment;

FIG. 21 is a graph of relative illuminance between 435nm and 650nm in visible light in example III.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The term "a lens has positive diopter (or negative diopter)" means that the paraxial diopter calculated by the Gaussian optics theory of the lens 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 sheets (lens data sheets) 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 value of R is negative, the image side surface is judged to be convex.

The present disclosure provides an optical imaging lens, which includes, in order from an object side to an image side along an optical axis, a first lens element to a sixth lens element; 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 first lens and the fourth lens are all spherical lenses made of glass materials, and the second lens, the fourth lens, the fifth lens and the sixth lens are all aspheric lenses made of plastic materials; the design of four plastic aspheric lenses is adopted, which is more beneficial to correcting secondary spectrum and high-level aberration.

The first lens has negative diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative diopter, the object side surface of the second lens is a concave surface at the position close to the optical axis, and the image side surface of the second lens is a concave surface; the third lens has positive diopter, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens has positive diopter, 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 has negative diopter, the object side surface of the fifth lens is a convex surface at the position close to the optical axis, and the image side surface of the fifth lens is a concave surface; the sixth lens element has a positive refractive power, an object-side surface of the sixth lens element is a convex surface, and an image-side surface of the sixth lens element is a convex surface.

The optical imaging lens provided by the utility model adopts six lenses, two glass lenses and four plastic aspheric lenses are combined, and each lens is correspondingly designed, so that the whole lens is small in size, low in cost and convenient to install and use; the distortion control is perfect, the edge deformation of the shot picture is small, and the later image processing is facilitated; the imaging target surface is large, the imaging target surface is suitable for a 1/2.8' chip, the light sensitivity is better, and the imaging signal-to-noise ratio is low; high contrast, uniform image surface brightness, and no dark and fuzzy phenomena in edge imaging.

Preferably, the optical imaging lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens, so that the optical lens is symmetrical in front and back, system aberration can be corrected, and imaging quality can be improved.

Preferably, the optical imaging lens satisfies: 20.000mm < f1 < -30.000mm, -5.000mm < f2 < -7.000mm,13.000mm < f3 < 17.000mm,5.000mm < f4 < 8.000mm, -4.000mm < f5 < -6.000mm,4.000mm < f6 < 6.000mm, wherein f1, f2, f3, f4, f5 and f6 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively, so that the optical power distribution of the lenses is uniform and reasonable, and the imaging quality is further improved.

Preferably, the optical imaging lens satisfies: 6.500 < | f1/f | < 9.000,1.000 < | f2/f | < 2.500,3.500 < | f3/f | < 5.000,1.000 < | f4/f | < 2.500,1.000 < | f5/f | < 2.000,1.000 < | f6/f | < 2.000, wherein f is the effective 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 optical power distribution of the lenses is uniform and reasonable, and the imaging quality is further improved.

Preferably, the optical imaging lens satisfies: nd1 is more than 1.60 and less than 1.90, vd1 is more than 45.00 and less than 60.00; nd2 is more than 1.50 and less than 1.70, and vd2 is more than 50.00 and less than 60.00; nd3 is more than 1.60 and less than 1.90, vd3 is more than 19.00 and less than 30.00; nd4 is more than 1.50 and less than 1.80, and vd4 is more than 50.00 and less than 70.00; nd5 is more than 1.60 and less than 1.70, vd5 is more than 18.00 and less than 25.00; nd6 is more than 1.50 and less than 1.70, and vd6 is more than 50.00 and less than 60.00; wherein nd1, nd2, nd3, nd4, nd5 and nd6 are refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively, and vd1, vd2, vd3, vd4, vd5 and vd6 are abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively. The glass lens is made of a material with high refractive index, so that the optical structure can be better optimized, the structural design of the lens is facilitated, and the cost of the lens is reduced.

Preferably, the optical imaging lens satisfies: 2.000 < | f₁₂₃/f₄₅₆< 3.000, wherein f₁₂₃Is the combined focal length of the first lens, the second lens and the third lens, f₄₅₆The focal length of the combination of the fourth lens, the fifth lens and the sixth lens is uniform and reasonable, and the imaging quality is further improved.

Preferably, the optical imaging lens satisfies: the outer diameter of any one of the first lens, the second lens and the sixth lens is smaller than 20mm, and the whole lens is thin.

Preferably, the optical imaging lens satisfies: TTL is less than 29.000mm, F is less than 3.550mm and less than 3.700mm, wherein TTL is the optical total length of the optical imaging lens, f is the effective focal length of the optical imaging lens, and the whole lens is short. The lens has compact integral structure and small volume, so that the lens is very convenient to install and use and has good practicability.

The optical imaging lens of the present invention will be described in detail with reference to the following embodiments.

The first embodiment is as follows:

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 passing the imaging light, and an image-side surface facing the image side A2 and passing the imaging light; the first lens 1 and the fourth lens 4 are all spherical lenses made of glass materials, and the second lens 2, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are all aspheric lenses made of plastic materials;

the first lens 1 has negative diopter, an object side surface 11 of the first lens 1 is a convex surface, and an image side surface 12 of the first lens 1 is a concave surface; the second lens element 2 has negative refractive power, the object-side surface 21 of the second lens element 2 is concave at a paraxial region thereof, and the image-side surface 22 of the second lens element 2 is concave; the third lens element 3 has a positive refractive power, the object-side surface 31 of the third lens element 3 is a concave surface, and the image-side surface 32 of the third lens element 3 is a convex surface; the fourth lens element 4 has positive refractive 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 negative refractive power, the object-side surface 51 of the fifth lens element 5 is convex at a position close to the optical axis, and the image-side surface 52 of the fifth lens element 5 is concave; the sixth lens element 6 has a positive refractive power, 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.

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 31, the object-side surface 51, the object-side surface 61, the image-side surface 22, the image-side surface 32, the image-side surface 52, and the image-side surface 62 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 this point in the direction of the optical axis.

c is the curvature of the surface.

k is the conic constant of the surface.

A₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆Respectively 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:

number of noodles

K

A4

A6

A8

A10

A12

A14

A16

21

-79.15

7.712E-03

-3.556E-04

-2.014E-05

4.165E-06

-1.922E-07

5.975E-10

1.327E-10

22

2.78

1.310E-02

-1.443E-03

2.422E-04

-3.988E-05

-4.141E-06

1.590E-06

-1.173E-07

31

-90.51

-4.007E-03

-1.306E-04

3.589E-04

-2.174E-04

5.352E-05

-6.190E-06

2.808E-07

32

-26.18

-6.765E-03

-1.265E-05

9.351E-04

-6.344E-04

2.142E-04

-3.664E-05

2.515E-06

51

7.74

-2.263E-02

2.331E-03

-3.430E-04

1.392E-04

-4.580E-05

7.027E-06

-4.139E-07

52

-1.18

-2.759E-02

3.077E-03

3.005E-05

-5.138E-05

6.464E-06

-4.274E-07

1.204E-08

61

-16.00

7.026E-03

-3.688E-03

1.041E-03

-1.430E-04

1.073E-05

-4.169E-07

6.377E-09

62

0.83

1.452E-03

3.317E-04

-1.347E-04

4.280E-05

-6.333E-06

4.950E-07

-1.489E-08

The MTF graph of the specific embodiment under the visible light of 435nm-650nm is shown in detail in FIG. 2, and it can be seen that the MTFs of the edges of the lens at 125lp/mm are all higher than 40%, and the imaging quality is good. Please refer to fig. 3 for a defocusing graph, fig. 4 for a transverse chromatic aberration graph, and fig. 5 for a longitudinal chromatic aberration graph, which shows that chromatic aberration and aberration are both corrected well and imaging quality is good; 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, and the absolute value of the distortion is less than 2%. The relative illumination chart is detailed in fig. 7, and it can be seen that the lens has high illumination, the edge contrast is higher than 60%, and the imaging quality is better.

In this specific embodiment, the effective focal length f =3.609mm of the optical imaging lens; field angle FOV =84.1 °; the diameter of an image plane is 6.46mm; the total optical length (distance on the optical axis I from the object side surface 11 of the first lens 1 to the imaging surface 9) TTL =27.420mm.

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

Example two:

as shown in fig. 8, this embodiment is the same as the embodiment in the aspect and the diopter, except that the optical parameters such as the curvature radius of each lens surface, the lens thickness, and the like are different.

The detailed optical data of this embodiment is shown in Table 2-1.

TABLE 2-1 detailed optical data for example two

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

noodle sequence number

K

A4

A6

A8

A10

A12

A14

A16

21

-104.69

7.901E-03

-3.465E-04

-1.997E-05

4.160E-06

-1.924E-07

5.706E-10

1.255E-10

22

2.77

1.372E-02

-1.492E-03

2.500E-04

-3.702E-05

-3.718E-06

1.609E-06

-1.277E-07

31

-128.64

-3.922E-03

-6.575E-05

3.757E-04

-2.170E-04

5.332E-05

-6.208E-06

2.829E-07

32

-40.85

-6.587E-03

-2.365E-05

9.871E-04

-6.292E-04

2.100E-04

-3.743E-05

2.793E-06

51

3.25

-2.268E-02

2.094E-03

-3.271E-04

1.432E-04

-4.618E-05

6.863E-06

-3.927E-07

52

-1.18

-2.756E-02

3.103E-03

3.084E-05

-5.155E-05

6.427E-06

-4.298E-07

1.280E-08

61

-15.72

7.128E-03

-3.678E-03

1.041E-03

-1.431E-04

1.072E-05

-4.172E-07

6.540E-09

62

0.83

1.020E-03

3.223E-04

-1.336E-04

4.285E-05

-6.337E-06

4.946E-07

-1.475E-08

The MTF graph of the specific embodiment under the visible light of 435nm-650nm is shown in detail in FIG. 9, and it can be seen that the MTFs of the edges of the lens at 125lp/mm are all higher than 40%, and the imaging quality is good. Referring to fig. 10, a defocus graph is shown in detail in fig. 11, and a longitudinal chromatic aberration graph is shown in detail in fig. 12, so that chromatic aberration and aberration are both corrected well, and imaging quality is good; the field curvature and distortion diagram are shown in detail in (a) and (B) of fig. 13, and it can be seen that both the field curvature and distortion are better corrected, and the absolute value of the distortion is less than 2%. The detailed diagram of the relative illumination is shown in fig. 14, and it can be seen that the lens illumination is high, the edge relative illumination is higher than 60%, and the imaging quality is better.

In this embodiment, the effective focal length f =3.575mm of the optical imaging lens; field angle FOV =84.1 °; the diameter of an image plane is 6.46mm; total optical length TTL =27.383mm.

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

Example three:

as shown in fig. 15, this embodiment is the same as the embodiment in the aspect and diopter, except that the optical parameters such as the curvature radius of each lens surface, the lens thickness, etc. are different.

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

TABLE 3-1 detailed optical data for example two

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

number of noodles

K

A4

A6

A8

A10

A12

A14

A16

21

-100.49

7.866E-03

-3.483E-04

-2.000E-05

4.163E-06

-1.922E-07

5.715E-10

1.255E-10

22

2.76

1.363E-02

-1.499E-03

2.480E-04

-3.732E-05

-3.754E-06

1.608E-06

-1.265E-07

31

-123.30

-3.914E-03

-6.198E-05

3.731E-04

-2.171E-04

5.337E-05

-6.203E-06

2.822E-07

32

-39.06

-6.657E-03

-6.381E-06

9.861E-04

-6.306E-04

2.102E-04

-3.729E-05

2.763E-06

51

5.57

-2.263E-02

2.139E-03

-3.313E-04

1.423E-04

-4.608E-05

6.901E-06

-3.977E-07

52

-1.18

-2.757E-02

3.099E-03

3.082E-05

-5.152E-05

6.433E-06

-4.293E-07

1.266E-08

61

-15.90

7.108E-03

-3.680E-03

1.041E-03

-1.431E-04

1.072E-05

-4.171E-07

6.510E-09

62

0.83

1.151E-03

3.228E-04

-1.338E-04

4.285E-05

-6.335E-06

4.946E-07

-1.481E-08

The MTF graph of the specific embodiment under the visible light of 435nm-650nm is shown in detail in FIG. 16, and it can be seen that the MTFs of the edges of the lens at 125lp/mm are all higher than 40%, and the imaging quality is good. Please refer to fig. 17 for a defocusing graph, fig. 18 for a transverse chromatic aberration graph, and fig. 19 for a longitudinal chromatic aberration graph, which shows that chromatic aberration and aberration are both corrected well and imaging quality is good; the field curvature and distortion map are shown in detail in (a) and (B) of fig. 20, and it can be seen that both the field curvature and distortion are better corrected, and the absolute value of the distortion is less than 2%. The specific graph of the relative illumination is shown in fig. 21, and it can be seen that the lens illumination is high, the edge relative illumination is higher than 60%, and the imaging quality is better.

In this embodiment, the effective focal length f =3.574mm of the optical imaging lens; field angle FOV =84.1 °; the diameter of an image surface is 6.46mm; total optical length TTL =27.360mm.

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

Table 4 values of relevant important parameters of three embodiments of the present invention

	Example one	Example two	EXAMPLE III
				f	3.609	3.575	3.574
|f1/f|	7.800	8.069	7.987
				|f2/f|	1.758	1.780	1.807
|f3/f|	4.015	4.741	4.618
				|f4/f|	1.895	1.861	1.890
|f5/f|	1.519	1.588	1.586
				|f6/f|	1.466	1.484	1.466
|f123/f456|	2.780	2.227	2.353

The foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. It should be understood that any modification, equivalent replacement, or improvement made by those skilled in the art after reading the present specification shall fall within the scope of the present invention.

Claims (8)

1. An optical imaging lens, characterized in that: the optical lens assembly comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence 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 first lens and the fourth lens are all spherical lenses made of glass materials, and the second lens, the fourth lens, the fifth lens and the sixth lens are all aspheric lenses made of plastic materials;

the first lens has negative diopter, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens has negative diopter, the object side surface of the second lens is a concave surface close to the optical axis, and the image side surface of the second lens is a concave surface;

the third lens has positive diopter, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;

the fourth lens has positive diopter, 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 has negative diopter, the object side surface of the fifth lens is a convex surface at the position close to the optical axis, and the image side surface of the fifth lens is a concave surface;

the sixth lens element has a positive refractive power, an object-side surface of the sixth lens element is a convex surface, and an image-side surface of the sixth lens element is a convex surface.

2. The optical imaging lens of claim 1, characterized in that: the diaphragm is arranged between the third lens and the fourth lens.

3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies: -20.000mm < f1 < -30.000mm, -5.000mm < f2 < -7.000mm,13.000mm < f3 < 17.000mm,5.000mm < f4 < 8.000mm, -4.000mm < f5 < -6.000mm,4.000mm < f6 < 6.000mm, wherein f1, f2, f3, f4, f5, f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, respectively.

4. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: 6.500 < | f1/f | < 9.000,1.000 < | f2/f | < 2.500,3.500 < | f3/f | < 5.000,1.000 < | f4/f | < 2.500,1.000 < | f5/f | < 2.000,1.000 < | f6/f | < 2.000, where f is the effective 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.

5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies: nd1 is more than 1.60 and less than 1.90, vd1 is more than 45.00 and less than 60.00; nd2 is more than 1.50 and less than 1.70, and vd2 is more than 50.00 and less than 60.00; nd3 is more than 1.60 and less than 1.90, vd3 is more than 19.00 and less than 30.00; nd4 is more than 1.50 and less than 1.80, and vd4 is more than 50.00 and less than 70.00; nd5 is more than 1.60 and less than 1.70, vd5 is more than 18.00 and less than 25.00; nd6 is more than 1.50 and less than 1.70, and vd6 is more than 50.00 and less than 60.00; and nd1, nd2, nd3, nd4, nd5 and nd6 are refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively, and vd1, vd2, vd3, vd4, vd5 and vd6 are Abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively.

6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies: 2.000 < | f₁₂₃/f₄₅₆< 3.000, wherein f₁₂₃Is the combined focal length of the first lens, the second lens and the third lens, f₄₅₆Is the combined focal length of the fourth lens, the fifth lens and the sixth lens.

7. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies: the outer diameter of any one of the first lens to the sixth lens is smaller than 20mm.

8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies: TTL is less than 29.000mm, and f is less than 3.700mm, wherein TTL is the optical total length of the optical imaging lens, and f is the effective focal length of the optical imaging lens.

Images