CN110703419A

CN110703419A - Image pickup lens assembly

Info

Publication number: CN110703419A
Application number: CN201911127440.2A
Authority: CN
Inventors: 周进; 李龙; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-01-17

Abstract

The present application discloses a photographing lens assembly, sequentially comprising, from an object side to an image side along an optical axis: a diaphragm; the image side surface of the first lens is a convex surface; a second lens having a negative refractive power, the object side surface of which is concave; the image side surface of the third lens is a convex surface; the fourth lens with focal power has a convex object-side surface and a concave image-side surface. Wherein the total effective focal length f of the image pickup lens group and half of the Semi-FOV of the maximum field angle of the image pickup lens group satisfy: 2.00mm < tan²(Semi-FOV). times.f < 4.00 mm; a total effective focal length f of the image pickup lens group, a combined focal length f123 of the first lens, the second lens, and the third lens, and a combined focal length f234 of the second lens, the third lens, and the fourth lens satisfy: 0.30 < (f/f123) - (f/f234) < 0.70.

Description

Image pickup lens assembly

Technical Field

The present application relates to the field of optical elements, and in particular, to a photographing lens assembly.

Background

Since the 21 st century, the development of manufacturing technology and functions of portable electronic products such as mobile phones and tablet computers is on the rise. The tendency of the camera lens group of portable electronic products such as mobile phones, tablet computers and the like to replace the traditional camera is more and more obvious at present. Especially, in recent years, the popularization of portable electronic products such as mobile phones and tablet computers brings about a revolution of the photographing function. The revolution leads the popularity of purchasing portable electronic products with high-quality camera shooting functions, such as mobile phones, tablet computers and the like.

Currently, in order to improve the photographing quality of a photographing lens group of a portable electronic product such as a mobile phone and a tablet computer in an all-round manner, a mainstream photographing lens group mostly adopts a form of at least one camera among an ultra-thin large image plane lens, a telephoto lens and a wide angle lens. Attributes such as ultra-thin, large image plane, wide angle or telephoto have become one of the criteria for evaluating the lens assembly of the camera.

Disclosure of Invention

An aspect of the present application provides an image capturing lens assembly, in order from an object side to an image side along an optical axis, comprising: a diaphragm; the image side surface of the first lens is a convex surface; a second lens having a negative refractive power, the object side surface of which is concave; the image side surface of the third lens is a convex surface; the fourth lens with focal power has a convex object-side surface and a concave image-side surface.

In one embodiment, the total effective focal length f of the image capturing lens group and half of the Semi-FOV of the maximum field angle of the image capturing lens group may satisfy: 2.00mm < tan²(Semi-FOV)×f＜4.00mm。

In one embodiment, the total effective focal length f of the image capturing lens group, the combined focal length f123 of the first, second, and third lenses, and the combined focal length f234 of the second, third, and fourth lenses may satisfy: 0.30 < (f/f123) - (f/f234) < 0.70.

In one embodiment, the maximum field angle FOV of the imaging lens group may satisfy: FOV > 91.5 deg.

In one embodiment, the combined focal length f34 of the third and fourth lenses and the optical back focus BFL of the image capturing lens group may satisfy: f34/BFL is more than 1.00 and less than 2.50. The optical back focus BFL of the photographing lens assembly in this application is a distance from the image side surface of the fourth lens element to the imaging surface of the photographing lens assembly.

In one embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens may satisfy: 0.50 < f1/f3 < 2.00.

In one embodiment, the total effective focal length f of the image capturing lens group and the radius of curvature R8 of the image side surface of the fourth lens element satisfy: 2.00 < f/R8 < 4.00.

In one embodiment, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R6 of the image-side surface of the third lens may satisfy: 0.20 < R2/R6 < 2.00.

In one embodiment, the central thickness CT3 of the third lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis may satisfy: 1.50 < (CT3+ CT4)/(CT3-CT4) < 7.00.

In one embodiment, the central thickness CT1 of the first lens on the optical axis and the separation distance T12 of the first lens and the second lens on the optical axis may satisfy: 0.50 < CT1/T12 < 2.50.

In one embodiment, a distance SAG21 on the optical axis from the intersection point of the object-side surface of the second lens and the optical axis to the effective radius vertex of the object-side surface of the second lens and a distance SAG22 on the optical axis from the intersection point of the image-side surface of the second lens and the optical axis to the effective radius vertex of the image-side surface of the second lens may satisfy: 2.50 < (SAG21+ SAG22)/(SAG21-SAG22) < 11.00.

In one embodiment, the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT42 of the image-side surface of the fourth lens may satisfy: 4.00 < DT42/DT11 < 5.50.

In one embodiment, a sum Σ AT of a distance TD on the optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element and a distance between any two adjacent first lens elements to the fourth lens elements on the optical axis may satisfy: sigma AT/TD < 0.37.

In one embodiment, the distance TTL from the object side surface of the first lens element to the imaging surface of the imaging lens group on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the imaging lens group satisfy: TTL/ImgH is less than 1.60.

This application has adopted four lens, through the focal power of rational distribution each lens, face type, the center thickness of each lens and the epaxial interval between each lens etc for above-mentioned camera lens group has at least one beneficial effect such as wide angle, big image plane, high image quality.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a schematic configuration diagram of a photographing lens group according to embodiment 1 of the present application;

fig. 2A to 2C show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image capturing lens group of embodiment 1;

fig. 3 shows a schematic configuration diagram of a photographing lens group according to embodiment 2 of the present application;

fig. 4A to 4C show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image capturing lens group of embodiment 2;

fig. 5 is a schematic view showing the structure of a photographing lens group according to embodiment 3 of the present application;

fig. 6A to 6C show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image taking lens group of embodiment 3;

fig. 7 is a schematic view showing the structure of a photographing lens group according to embodiment 4 of the present application;

fig. 8A to 8C show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image capturing lens group of embodiment 4;

fig. 9 is a schematic view showing the structure of a photographing lens group according to embodiment 5 of the present application;

fig. 10A to 10C show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image taking lens group of embodiment 5;

fig. 11 is a schematic view showing the structure of a photographing lens group according to embodiment 6 of the present application;

fig. 12A to 12C show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image taking lens group of embodiment 6;

fig. 13 is a schematic view showing the structure of a photographing lens group according to embodiment 7 of the present application;

fig. 14A to 14C show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image capturing lens group of embodiment 7.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

The image pickup lens group according to an exemplary embodiment of the present application may include, for example, four lenses having optical powers, respectively a first lens, a second lens, a third lens, and a fourth lens. The four lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the fourth lens can have a spacing distance therebetween.

In an exemplary embodiment, the first lens may have a positive optical power, and the image-side surface thereof may be convex; the second lens can have negative focal power, and the object side surface of the second lens can be a concave surface; the third lens can have positive focal power, and the image side surface of the third lens can be a convex surface; the fourth lens element can have a positive or negative power, and can have a convex object-side surface and a concave image-side surface.

The first lens has positive focal power, so that light rays can be better converged at the image side surface while the system has a larger field angle. Similarly, the second lens has negative focal power, so that a system has a larger image plane, namely, a higher imaging plane can be obtained with the same field angle, and imaging is clearer. The fourth lens has positive focal power or negative focal power, so that central light rays can be better converged on the image side; meanwhile, the marginal light rays are diffused, so that the image plane supported by the system is larger.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 2.00mm < tan²(Semi-FOV). times.f < 4.00mm, where f is the total effective focal length of the image pickup lens group, and Semi-FOV is half the maximum field angle of the image pickup lens group. More specifically, Semi-FOV and f further satisfy: 2.40mm < tan²(Semi-FOV). times.f < 4.00 mm. 2.00mm < tan²The (Semi-FOV) x f is less than 4.00mm, so that the advantage of the wide-angle lens can be increased, and the camera lens group has a wider imaging range.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.30 < (f/f123) - (f/f234) < 0.70, where f is the total effective focal length of the image pickup lens group, f123 is the combined focal length of the first lens, the second lens, and the third lens, and f234 is the combined focal length of the second lens, the third lens, and the fourth lens. Satisfy 0.30 < (f/f123) - (f/f234) < 0.70, can make the first lens to the fourth lens rational in infrastructure, make light more smooth, effectively reduce the angle of deflection of light, reduce the sensitivity of lens.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: the FOV is more than 91.5 degrees, wherein the FOV is the maximum angle of view of the camera lens group. The FOV is more than 91.5 degrees, the angle range of the lens capable of receiving the image is larger, and the problem that the standard lens cannot completely take the picture due to the fact that the picture taking is limited by regions can be avoided. In other words, such a shot sees a much larger range of scenes from a certain viewpoint than the human eye sees from the same viewpoint. The field angle of the lens is large, the scene is deep and long, a quite large clear range can be shown, and better photographing experience can be brought.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: f34/BFL is more than 1.00 and less than 2.50, wherein f34 is the combined focal length of the third lens and the fourth lens, BFL is the optical back focus of the photographing lens group, and BFL is the distance from the image side surface of the fourth lens to the imaging surface of the photographing lens group. More specifically, f34 and BFL may further satisfy: f34/BFL is more than 1.50 and less than 2.20. F34/BFL is more than 1.00 and less than 2.50, so that the structural distribution of the lens is more reasonable, the central light can be more converged, and the definition of the camera lens group is further improved; meanwhile, the image surface supported by the marginal light is larger, so that the camera lens group can effectively exert the advantages of a wide-angle lens.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.50 < f1/f3 < 2.00, wherein f1 is the effective focal length of the first lens and f3 is the effective focal length of the third lens. More specifically, f1 and f3 may further satisfy: f1/f3 is more than 0.60 and less than 1.80. The requirement that f1/f3 is more than 0.50 and less than 2.00 is met, the first lens can be prevented from bearing excessive light converging function to cause difficulty in processing the first lens, and the possibility of poor imaging effect caused by the fact that the depth of field of the system is too short is also avoided.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 2.00 < f/R8 < 4.00, wherein f is the total effective focal length of the image pickup lens group, and R8 is the radius of curvature of the image side surface of the fourth lens element. More specifically, f and R8 further satisfy: 2.50 < f/R8 < 4.00. Satisfying 2.00 < f/R8 < 4.00 is beneficial to avoiding the problem that the processing of the fourth lens is difficult due to the undersize R8, and simultaneously avoiding the problem that the imaging quality is deteriorated because the system cannot support a larger field angle due to the oversized R8.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.20 < R2/R6 < 2.00, wherein R2 is a radius of curvature of an image-side surface of the first lens, and R6 is a radius of curvature of an image-side surface of the third lens. More specifically, R2 and R6 may further satisfy: 0.40 < R2/R6 < 1.7. The requirement that R2/R6 is more than 0.20 and less than 2.00 is met, the over-thickness of the third lens is avoided, the processing difficulty of the third lens is reduced, and meanwhile, the camera lens group has better capability of balancing chromatic aberration and distortion.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 1.50 < (CT3+ CT4)/(CT3-CT4) < 7.00, wherein CT3 is the central thickness of the third lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis. More specifically, CT3 and CT4 further satisfy: 1.90 < (CT3+ CT4)/(CT3-CT4) < 6.80. The requirement of 1.50 < (CT3+ CT4)/(CT3-CT4) < 7.00 is met, the processing difficulty caused by the over-thick thickness of one of the third lens and the fourth lens can be avoided, the structural distribution of the system can be more reasonable, and the spherical aberration correction capability of the system is facilitated.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.50 < CT1/T12 < 2.50, wherein CT1 is the central thickness of the first lens on the optical axis, and T12 is the separation distance between the first lens and the second lens on the optical axis. More specifically, CT1 and T12 further satisfy: 0.80 < CT1/T12 < 2.20. The requirement of 0.50 < CT1/T12 < 2.50 is favorable for avoiding ghost images between the first lens and the second lens, and the system has better spherical aberration and distortion correction function.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 2.50 < (SAG21+ SAG22)/(SAG21-SAG22) < 11.00, wherein SAG21 is a distance on the optical axis from the intersection point of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens, and SAG22 is a distance on the optical axis from the intersection point of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens. More specifically, SAG21 and SAG22 further may satisfy: 2.70 < (SAG21+ SAG22)/(SAG21-SAG22) < 10.80. Satisfies 2.50 < (SAG21+ SAG22)/(SAG21-SAG22) < 11.00, can avoid the second lens from bending too much, reduces the processing difficulty, and simultaneously enables the assembly of the image pickup lens group to have higher stability.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 4.00 < DT42/DT11 < 5.50, where DT11 is the maximum effective radius of the object-side surface of the first lens and DT42 is the maximum effective radius of the image-side surface of the fourth lens. More specifically, DT42 and DT11 further satisfy: 4.10 < DT42/DT11 < 5.40. The requirements of DT42/DT11 of 4.00 < 5.50 are met, the problem that the size of the lens is too large due to the overlarge caliber of the fourth lens is avoided, the assembly is more stable, the camera lens group has the characteristic of a small head, and the lens of portable electronic products such as mobile phones and the like is more attractive.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: Σ AT/TD < 0.37, where TD is the distance on the optical axis between the object-side surface of the first lens element and the image-side surface of the fourth lens element, Σ AT is the sum of the distances on the optical axis between any two adjacent first lens elements and fourth lens elements. Satisfies the requirement that the Sigma AT/TD is less than 0.37, not only can effectively reduce the size of the camera lens group, but also can control the sum of the spacing distances of all the lenses, is favorable for adjusting the structure of the camera lens group and reduces the difficulty of lens processing and assembling.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: TTL/ImgH < 1.60, wherein, TTL is the distance between the object side surface of the first lens and the imaging surface of the camera lens group on the optical axis, and ImgH is half of the length of the diagonal line of the effective pixel area on the imaging surface of the camera lens group. The lens meets the condition that TTL/ImgH is less than 1.60, the whole size of the lens can be effectively shortened to match with various increasingly thin electronic devices, and the limitation of the application range of the camera lens group due to overlarge size is avoided. The design can ensure that the lens has better imaging quality, the camera lens group has wider imaging range under the same size condition, and simultaneously, the depth of field of the system is favorably increased, so that the lens has stronger sense of distance.

In an exemplary embodiment, an image capturing lens group according to the present application further includes a stop disposed between the object side and the first lens. Optionally, the above-mentioned image pickup lens group may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the image plane. The application provides a camera lens group with characteristics of large image surface, wide angle, high pixel and the like, which can have good imaging quality at a far and a near scene and can obtain satisfactory imaging effect under different environments.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the fourth lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object-side surface and the image-side surface of each of the first lens, the second lens, the third lens, and the fourth lens is an aspheric mirror surface. Optionally, each of the first, second, third, and fourth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the imaging lens group can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although four lenses are exemplified in the embodiment, the image pickup lens group is not limited to including four lenses. The image pickup lens group may further include other numbers of lenses if necessary.

Specific examples of the image pickup lens group applicable to the above embodiments are further described below with reference to the drawings.

Example 1

An image capturing lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2C. Fig. 1 shows a schematic configuration diagram of an image capturing lens group according to embodiment 1 of the present application.

As shown in fig. 1, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

Table 1 shows a basic parameter table of the image pickup lens group of embodiment 1, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 1

In the present example, the total effective focal length f of the image-taking lens group is 2.04mm, the total length TTL of the image-taking lens group (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S11 of the image-taking lens group) is 3.63mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the image-taking lens group is 2.40mm, the half Semi-FOV of the maximum angle of view of the image-taking lens group is 52.2 °, and the aperture value Fno of the image-taking lens group is 2.35.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the fourth lens E4 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the height of the aspheric surface along the optical axish is the distance from the vertex of the aspheric surface to the rise; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S8 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-3.0711E-01

3.1807E+00

-9.7514E+01

1.5540E+03

-1.5007E+04

8.8383E+04

-3.0790E+05

5.7550E+05

-4.3629E+05

S2

-8.7688E-02

-4.7589E+00

6.9674E+01

-6.3248E+02

3.6034E+03

-1.2902E+04

2.8140E+04

-3.4115E+04

1.7596E+04

S3

2.9367E-02

-2.8579E+00

2.7041E+01

-1.4079E+02

5.1617E+02

-1.2513E+03

1.8629E+03

-1.5349E+03

5.3496E+02

S4

1.5143E-03

-1.2508E+00

8.0583E+00

-2.5216E+01

5.1470E+01

-6.8997E+01

5.7319E+01

-2.6603E+01

5.2780E+00

S5

5.1178E-02

-1.0329E-01

1.3649E-02

2.5864E-01

-6.0808E-01

6.4640E-01

-3.5596E-01

9.4235E-02

-7.8791E-03

S6

-9.2024E-02

4.0549E-01

-9.8287E-01

1.3855E+00

-1.3039E+00

8.6292E-01

-4.0864E-01

1.2415E-01

-1.6826E-02

S7

-2.2957E-02

-1.8228E-01

2.5973E-02

-2.1117E-01

6.4663E-01

-7.0932E-01

3.7772E-01

-9.8791E-02

1.0172E-02

S8

-1.4916E-01

-5.9243E-01

8.6163E-01

-6.4868E-01

3.0230E-01

-9.0367E-02

1.6908E-02

-1.8041E-03

8.3809E-05

TABLE 2

Fig. 2A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 1, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 1. Fig. 2C shows a distortion curve of the image capturing lens group of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 2A to 2C, the imaging lens assembly of embodiment 1 can achieve good imaging quality.

Example 2

An image capturing lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C. Fig. 3 shows a schematic configuration diagram of a photographing lens group according to embodiment 2 of the present application.

As shown in fig. 3, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the image-taking lens group is 1.98mm, the total length TTL of the image-taking lens group is 3.63mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the image-taking lens group is 2.40mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 53.5 °, and the aperture value Fno of the image-taking lens group is 2.40.

Table 3 shows a basic parameter table of the image pickup lens group of embodiment 2, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.9803E-01

-1.7016E+0

2.5784E+01

-2.6676E+02

1.6881E+03

-6.6945E+03

1.6141E+04

-2.1202E+04

1.1478E+04

S2

-2.9672E-01

-6.7169E-01

6.9108E+00

-3.1137E+01

8.7856E+01

-1.4561E+02

1.3663E+02

-6.7266E+01

1.3512E+01

S3

-6.5115E-01

-2.1042E-01

3.0971E+00

-3.1079E+00

-1.2220E+00

4.3114E+00

-3.2371E+00

1.0709E+00

-1.3566E-01

S4

-3.2015E-01

-1.1471E-01

1.1132E+00

-1.7419E+00

1.4392E+00

-6.9190E-01

1.9267E-01

-2.8789E-02

1.7860E-03

S5

1.6203E-01

-2.2888E-01

1.1831E-01

2.1874E-02

-6.2834E-02

9.9953E-03

2.1231E-02

-1.0982E-02

1.5476E-03

S6

-8.6426E-02

3.8951E-01

-1.0254E+00

1.7683E+00

-2.0381E+00

1.5318E+00

-7.2148E-01

1.9286E-01

-2.2087E-02

S7

-1.1651E-01

-1.1568E-01

1.5265E-02

1.3397E-01

-1.4985E-01

7.2851E-02

-1.7395E-02

1.8597E-03

-6.1352E-05

S8

-8.1817E-01

5.0679E-01

-2.5249E-01

9.4833E-02

-2.5755E-02

4.7407E-03

-5.4560E-04

3.4724E-05

-9.2333E-07

TABLE 4

Fig. 4A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 2, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 2. Fig. 4C shows a distortion curve of the image capturing lens group of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 4A to 4C, the image capturing lens assembly according to embodiment 2 can achieve good image quality.

Example 3

A photographing lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6C. Fig. 5 shows a schematic structural view of a photographing lens group according to embodiment 3 of the present application.

As shown in fig. 5, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the image-taking lens group is 2.11mm, the total length TTL of the image-taking lens group is 3.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the image-taking lens group is 2.40mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 49.3 °, and the aperture value Fno of the image-taking lens group is 2.30.

Table 5 shows a basic parameter table of the image pickup lens group of embodiment 3, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.6987E-01

-7.5521E+00

2.1487E+02

-3.8212E+03

4.1860E+04

-2.8520E+05

1.1761E+06

-2.6868E+06

2.6100E+06

S2

-1.0369E-01

-3.5503E+00

5.6490E+01

-5.1981E+02

2.9808E+03

-1.0832E+04

2.4442E+04

-3.1433E+04

1.7676E+04

S3

-4.4405E-01

3.5282E+00

-4.1706E+01

2.8673E+02

-1.0823E+03

2.4351E+03

-3.2744E+03

2.4307E+03

-7.6575E+02

S4

-6.7066E-02

1.3702E-01

-8.0410E+00

4.7429E+01

-1.2665E+02

1.9041E+02

-1.6677E+02

7.9529E+01

-1.5961E+01

S5

4.1899E-01

-1.6310E+00

2.6881E+00

-1.3709E+00

-2.1874E+00

4.0720E+00

-2.7231E+00

8.3377E-01

-9.5704E-02

S6

-3.2635E-01

1.7084E+00

-5.0009E+00

9.7765E+00

-1.3335E+01

1.2357E+01

-7.3356E+00

2.4912E+00

-3.6403E-01

S7

1.2868E-01

-3.6104E-01

1.7278E-01

2.2120E-01

-4.4454E-01

3.5313E-01

-1.5469E-01

3.6787E-02

-3.7213E-03

S8

-6.8531E-01

4.5771E-01

-3.0166E-01

1.5544E-01

-5.9823E-02

1.6150E-02

-2.8766E-03

3.0523E-04

-1.4970E-05

TABLE 6

Fig. 6A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 3, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 3. Fig. 6C shows a distortion curve of the image capturing lens group of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 6A to 6C, the imaging lens assembly according to embodiment 3 can achieve good imaging quality.

Example 4

An image capturing lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8C. Fig. 7 shows a schematic configuration diagram of a photographing lens group according to embodiment 4 of the present application.

As shown in fig. 7, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the image-taking lens group is 2.21mm, the total length TTL of the image-taking lens group is 3.73mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the image-taking lens group is 2.40mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 47.8 °, and the aperture value Fno of the image-taking lens group is 2.50.

Table 7 shows a basic parameter table of the image pickup lens group of embodiment 4, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.6743E-01

-8.8784E+00

2.7047E+02

-5.0864E+03

5.9071E+04

-4.2773E+05

1.8784E+06

-4.5760E+06

4.7435E+06

S2

-1.1944E-01

-3.1558E+00

5.3066E+01

-5.0992E+02

3.0331E+03

-1.1354E+04

2.6181E+04

-3.4118E+04

1.9309E+04

S3

-4.9959E-01

3.7871E+00

-3.7273E+01

2.1645E+02

-6.9122E+02

1.3050E+03

-1.4608E+03

8.9629E+02

-2.3172E+02

S4

-1.3901E-01

1.2400E+00

-1.2756E+01

5.0990E+01

-1.0059E+02

1.0707E+02

-5.7850E+01

1.0857E+01

1.2106E+00

S5

3.0516E-01

-2.5768E-01

-3.8667E+00

1.4938E+01

-2.5723E+01

2.4493E+01

-1.3071E+01

3.5791E+00

-3.7611E-01

S6

-1.6499E-01

1.0506E+00

-4.0118E+00

1.0656E+01

-1.9021E+01

2.1534E+01

-1.4710E+01

5.5178E+00

-8.6998E-01

S7

1.6998E-01

-7.8905E-01

1.4774E+00

-1.7405E+00

1.2850E+00

-5.8851E-01

1.6031E-01

-2.3290E-02

1.3359E-03

S8

-9.0084E-01

9.4345E-01

-8.6759E-01

5.5826E-01

-2.4409E-01

7.0805E-02

-1.3081E-02

1.3975E-03

-6.6080E-05

TABLE 8

Fig. 8A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 4. Fig. 8C shows a distortion curve of the image capturing lens group of embodiment 4, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 8A to 8C, the imaging lens assembly according to embodiment 4 can achieve good imaging quality.

Example 5

An image capturing lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10C. Fig. 9 shows a schematic configuration diagram of a photographing lens group according to embodiment 5 of the present application.

As shown in fig. 9, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the image-taking lens group is 2.36mm, the total length TTL of the image-taking lens group is 3.81mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the image-taking lens group is 2.40mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 45.9 °, and the aperture value Fno of the image-taking lens group is 2.55.

Table 9 shows a basic parameter table of the image pickup lens group of embodiment 5, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-2.1637E-01

-5.6929E+00

1.5933E+02

-2.8213E+03

3.0576E+04

-2.0536E+05

8.3215E+05

-1.8619E+06

1.7654E+06

S2

-1.2978E-01

-2.2584E+00

4.0071E+01

-3.9862E+02

2.4753E+03

-9.7140E+03

2.3523E+04

-3.2109E+04

1.8911E+04

S3

-9.9811E-02

-8.5847E-01

3.6241E+00

2.3711E+01

-1.7095E+02

4.6640E+02

-6.5249E+02

4.4864E+02

-1.1226E+02

S4

5.8561E-02

-2.5525E+00

1.3775E+01

-4.3299E+01

9.6624E+01

-1.5312E+02

1.6049E+02

-9.7917E+01

2.6010E+01

S5

2.7759E-01

-1.6907E+00

5.6973E+00

-1.2989E+01

1.9998E+01

-2.0407E+01

1.3060E+01

-4.6872E+00

7.1453E-01

S6

-1.7284E-01

7.4751E-01

-2.2796E+00

4.8922E+00

-7.3513E+00

7.3834E+00

-4.6845E+00

1.6851E+00

-2.5906E-01

S7

-1.4286E-01

6.9892E-02

-2.6939E-01

4.2501E-01

-3.6712E-01

1.9071E-01

-6.1341E-02

1.1775E-02

-1.0618E-03

S8

-4.1624E-01

1.5262E-01

-1.0771E-02

-2.6645E-02

1.7443E-02

-5.7836E-03

1.1452E-03

-1.2789E-04

6.1236E-06

Watch 10

Fig. 10A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 5, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 5. Fig. 10C shows a distortion curve of the image capturing lens group of embodiment 5, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 10A to 10C, the imaging lens assembly according to embodiment 5 can achieve good imaging quality.

Example 6

A photographing lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12C. Fig. 11 shows a schematic configuration diagram of a photographing lens group according to embodiment 6 of the present application.

As shown in fig. 11, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

In this example, the total effective focal length f of the image-taking lens group is 2.04mm, the total length TTL of the image-taking lens group is 3.63mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the image-taking lens group is 2.40mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 52.2 °, and the aperture value Fno of the image-taking lens group is 2.35.

Table 11 shows a basic parameter table of the imaging lens group of embodiment 6, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 12 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 11

TABLE 12

Fig. 12A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 6, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 6. Fig. 12C shows a distortion curve of the image capturing lens group of embodiment 6, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 12A to 12C, the imaging lens assembly according to embodiment 6 can achieve good imaging quality.

Example 7

A photographing lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14C. Fig. 13 shows a schematic configuration diagram of an image capturing lens group according to embodiment 7 of the present application.

As shown in fig. 13, the image capturing lens assembly, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.

In this example, the total effective focal length f of the image-taking lens group is 1.78mm, the total length TTL of the image-taking lens group is 3.20mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S11 of the image-taking lens group is 2.40mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 56.1 °, and the aperture value Fno of the image-taking lens group is 2.75.

Table 13 shows a basic parameter table of the image pickup lens group of embodiment 7, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 13

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-3.9930E-01

-2.6316E+00

1.6105E+02

-6.7553E+03

1.5556E+05

-2.1084E+06

1.6681E+07

-7.1078E+07

1.2554E+08

S2

-2.3287E-01

-1.1206E+01

2.1594E+02

-2.6866E+03

2.2426E+04

-1.2148E+05

4.0916E+05

-7.7865E+05

6.4142E+05

S3

-1.0227E+00

2.3887E+00

-5.7354E+01

6.2041E+02

-2.7624E+03

6.0242E+03

-5.2662E+03

-2.4542E+03

6.6362E+03

S4

-2.8164E-01

2.4993E-01

-8.5025E+00

4.6746E+01

-7.6931E+01

-6.0077E+01

3.7663E+02

-4.9611E+02

2.3132E+02

S5

5.1372E-01

-1.4349E+00

6.0013E-01

6.7511E+00

-2.2651E+01

3.7108E+01

-3.5393E+01

1.8733E+01

-4.2182E+00

S6

-8.2850E-01

4.7235E+00

-1.4869E+01

3.2153E+01

-4.9311E+01

5.1888E+01

-3.5232E+01

1.3769E+01

-2.3248E+00

S7

3.0090E-01

-6.4484E-01

1.2622E-01

2.3959E-01

2.2958E-01

-7.4820E-01

5.9554E-01

-2.0407E-01

2.6254E-02

S8

-2.2288E-01

-6.4883E-01

1.1848E+00

-1.0716E+00

6.0221E-01

-2.1864E-01

5.0054E-02

-6.5705E-03

3.7619E-04

TABLE 14

Fig. 14A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 7, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 7. Fig. 14C shows a distortion curve of the image capturing lens group of embodiment 7, which represents distortion magnitude values corresponding to different angles of view. As can be seen from fig. 14A to 14C, the imaging lens assembly according to embodiment 7 can achieve good imaging quality.

In summary, examples 1 to 7 each satisfy the relationship shown in table 15.

Conditions/examples	1	2	3	4	5	6	7
								tan²(Semi-FOV)×f(mm)	3.39	3.62	2.86	2.68	2.51	3.39	3.96
(f/f123)-(f/f234)	0.38	0.55	0.46	0.65	0.55	0.38	0.31
								FOV(°)	104.5	107.0	98.7	95.5	91.7	104.5	112.3
f34/BFL	1.53	2.03	1.78	2.09	2.12	1.53	1.60
								f1/f3	1.28	1.68	1.08	1.21	0.82	1.28	0.65
f/R8	2.84	3.95	3.44	3.64	3.20	2.84	2.63
								R2/R6	1.47	1.66	1.18	1.47	0.47	1.47	0.68
(CT3+CT4)/(CT3-CT4)	2.62	1.95	2.81	3.08	6.73	2.62	4.27
								CT1/T12	1.30	2.01	1.01	0.86	0.98	1.30	2.08
(SAG21+SAG22)/(SAG21-SAG22)	7.90	2.81	5.60	3.33	9.56	7.88	10.71
								DT42/DT11	4.23	5.06	4.24	4.47	4.13	4.21	5.36
ΣAT/TD	0.16	0.24	0.25	0.27	0.36	0.16	0.19
								TTL/ImgH	1.51	1.51	1.54	1.56	1.59	1.51	1.33

Watch 15

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the above-described image-taking lens group.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a diaphragm;

the image side surface of the first lens is a convex surface;

a second lens having a negative refractive power, the object side surface of which is concave;

the image side surface of the third lens is a convex surface;

a fourth lens having a focal power, wherein the object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is concave;

wherein the total effective focal length f of the image pickup lens group and half of the Semi-FOV of the maximum field angle of the image pickup lens group satisfy: 2.00mm < tan²(Semi-FOV)×f＜4.00mm；

A total effective focal length f of the image pickup lens group, a combined focal length f123 of the first lens, the second lens, and the third lens, and a combined focal length f234 of the second lens, the third lens, and the fourth lens satisfy: 0.30 < (f/f123) - (f/f234) < 0.70.

2. The imaging lens group according to claim 1, wherein a maximum field angle FOV of the imaging lens group satisfies: FOV > 91.5 deg.

3. The imaging lens group of claim 1, wherein a combined focal length f34 of the third and fourth lenses and an optical back focus BFL of the imaging lens group satisfy: f34/BFL is more than 1.00 and less than 2.50.

4. The imaging lens group of claim 1, wherein the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.50 < f1/f3 < 2.00.

5. The imaging lens group of claim 1, wherein the total effective focal length f of the imaging lens group and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 2.00 < f/R8 < 4.00.

6. The imaging lens group of claim 1, wherein the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R6 of the image-side surface of the third lens satisfy: 0.20 < R2/R6 < 2.00.

7. The imaging lens group of claim 1, wherein a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 1.50 < (CT3+ CT4)/(CT3-CT4) < 7.00.

8. The imaging lens group of claim 1, wherein a center thickness CT1 of the first lens on the optical axis and a separation distance T12 of the first lens and the second lens on the optical axis satisfy: 0.50 < CT1/T12 < 2.50.

9. The image-capturing lens group according to claim 1, wherein a distance SAG21 on the optical axis from an intersection point of an object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens to a distance SAG22 on the optical axis from an intersection point of an image-side surface of the second lens and the optical axis to an effective radius vertex of the image-side surface of the second lens satisfies: 2.50 < (SAG21+ SAG22)/(SAG21-SAG22) < 11.00.

10. The imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a diaphragm;

the image side surface of the first lens is a convex surface;

the image side surface of the third lens is a convex surface;

wherein, the distance TTL between the object side surface of the first lens element and the imaging surface of the image capturing lens assembly on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the image capturing lens assembly satisfy: TTL/ImgH is less than 1.60.