CN111856724A - Image pickup lens assembly - Google Patents

Abstract

The present application discloses a photographing lens assembly, sequentially comprising, from an object side to an image side along an optical axis: a first lens having a negative refractive power, an object side surface of which is a concave surface; a second lens having an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens element having a negative refractive power, the object-side surface of which is convex; a sixth lens having a refractive power, an object side surface of which is concave; and a seventh lens having optical power; half of the Semi-FOV of the maximum field angle of the image pickup lens group satisfies: Semi-FOV is greater than or equal to 61.69 degrees; and the total effective focal length f of the camera lens group and the effective focal length f1 of the first lens meet the following conditions: -3.9 ≦ f1/f < -2.5.

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

Nowadays, a smart phone is no longer just a communication device, but becomes an essential entertainment facility for people. The camera capability of smart phones is one of the focuses of people.

Although the standard lens can image clearly in most cases, when used to photograph very broad scenes such as tall buildings or mountains, the standard lens can only photograph a part of the scenery and cannot represent the macrofeatures and the features of the scenery. Therefore, among various lenses suitable for a camera lens of a smart phone, a wide-angle lens is popular with many photography enthusiasts.

How to reasonably distribute the focal power and the surface type of each lens and the main technical parameters of the camera lens group to realize that the camera lens group can not only completely image the scenery on the image surface when shooting a wide scene, but also exaggerate the prospect, express the sense of distance of the scenery, increase the sense of depth in space of the photographic picture and the appeal of the picture, and is one of the problems to be urgently solved by many lens designers at present.

Disclosure of Invention

The present application provides a photographing lens assembly, in order from an object side to an image side along an optical axis comprising: a first lens having a negative refractive power, an object side surface of which is a concave surface; a second lens having an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens element having a negative refractive power, the object-side surface of which is convex; a sixth lens having a refractive power, an object side surface of which is concave; and a seventh lens having optical power; half of the Semi-FOV of the maximum field angle of the image-taking lens group can satisfy: Semi-FOV is greater than or equal to 61.69 degrees; and the total effective focal length f of the image capturing lens group and the effective focal length f1 of the first lens element satisfy: -3.9 ≦ f1/f < -2.5.

In one embodiment, the object-side surface of the first lens element to the image-side surface of the seventh lens element has at least one aspherical mirror surface.

In one embodiment, the total effective focal length f of the image capturing lens group, the effective focal length f5 of the fifth lens element, and the effective focal length f6 of the sixth lens element satisfy: -2.2 < (f5+ f6)/f < -1.4.

In one embodiment, the total effective focal length f of the image capturing lens group and the radius of curvature R1 of the object side surface of the first lens element satisfy: -1.6 < R1/f < -1.4.

In one embodiment, the maximum effective radius DT31 of the object-side surface of the third lens and the maximum effective radius DT21 of the object-side surface of the second lens may satisfy: 0.5 < DT31/DT21 < 0.8.

In one embodiment, the separation distance T12 between the first lens and the second lens on the optical axis and the central thickness CT1 of the first lens on the optical axis may satisfy: 0.2 < T12/CT1 < 0.9.

In one embodiment, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 2 is less than or equal to CT6/CT7 is less than 3.

In one embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the imaging lens group, the radius of curvature R11 of the object-side surface of the sixth lens element, and the radius of curvature R12 of the image-side surface of the sixth lens element may satisfy: 0.5 < ImgH/| R11+ R12| < 0.8.

In one embodiment, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy: 0.2 < (R9-R10)/(R9+ R10) is less than or equal to 0.56.

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: 2 < CT3/CT4 < 3.

In one embodiment, a distance SAG12 on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the effective radius vertex of the image-side surface of the first lens and a distance SAG32 on the optical axis from the intersection point of the image-side surface of the third lens and the optical axis to the effective radius vertex of the image-side surface of the third lens may satisfy: -1.02 ≦ SAG12/SAG32 < -0.5.

In one embodiment, a sum Σ CT of a distance TTL on the optical axis from the object side surface of the first lens element to the image forming surface of the image pickup lens group and center thicknesses on the optical axis of the first lens element to the seventh lens element may satisfy: sigma CT/TTL is more than 0.4 and less than 0.7.

In another aspect, the present application provides a photographing lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a negative refractive power, an object side surface of which is a concave surface; a second lens having an optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens element having a negative refractive power, the object-side surface of which is convex; a sixth lens having a refractive power, an object side surface of which is concave; and a seventh lens having optical power; half of the Semi-FOV of the maximum field angle of the image-taking lens group can satisfy: Semi-FOV is greater than or equal to 61.69 degrees; and 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 can satisfy: 2 < CT3/CT4 < 3.

In one embodiment, the total effective focal length f of the image capturing lens group, the effective focal length f5 of the fifth lens element, and the effective focal length f6 of the sixth lens element satisfy: -2.2 < (f5+ f6)/f < -1.4.

In one embodiment, the total effective focal length f of the image capturing lens group and the radius of curvature R1 of the object side surface of the first lens element satisfy: -1.6 < R1/f < -1.4.

In one embodiment, the maximum effective radius DT31 of the object-side surface of the third lens and the maximum effective radius DT21 of the object-side surface of the second lens may satisfy: 0.5 < DT31/DT21 < 0.8.

In one embodiment, the separation distance T12 between the first lens and the second lens on the optical axis and the central thickness CT1 of the first lens on the optical axis may satisfy: 0.2 < T12/CT1 < 0.9.

In one embodiment, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 2 is less than or equal to CT6/CT7 is less than 3.

In one embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the imaging lens group, the radius of curvature R11 of the object-side surface of the sixth lens element, and the radius of curvature R12 of the image-side surface of the sixth lens element may satisfy: 0.5 < ImgH/| R11+ R12| < 0.8.

In one embodiment, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy: 0.2 < (R9-R10)/(R9+ R10) is less than or equal to 0.56.

In one embodiment, a distance SAG12 on the optical axis from the intersection point of the image-side surface of the first lens and the optical axis to the effective radius vertex of the image-side surface of the first lens and a distance SAG32 on the optical axis from the intersection point of the image-side surface of the third lens and the optical axis to the effective radius vertex of the image-side surface of the third lens may satisfy: -1.02 ≦ SAG12/SAG32 < -0.5.

In one embodiment, the total effective focal length f of the image capturing lens group and the effective focal length f1 of the first lens element satisfy: -3.9 ≦ f1/f < -2.5.

In one embodiment, a sum Σ CT of a distance TTL on the optical axis from the object side surface of the first lens element to the image forming surface of the image pickup lens group and center thicknesses on the optical axis of the first lens element to the seventh lens element may satisfy: sigma CT/TTL is more than 0.4 and less than 0.7.

The optical imaging system has the advantages that the seven lenses are adopted, the focal power, the surface type and the center thickness of each lens are reasonably distributed, the distance between the lenses on the axis is equal, and the like, so that the optical imaging system has at least one beneficial effect of large visual angle, long depth of field, high imaging quality and the like.

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 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration 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 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration 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 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the image capturing 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 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification 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 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing 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 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification 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; and

fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification 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 capturing lens group according to an exemplary embodiment of the present application may include seven lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, respectively. The seven 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 seventh lens may have a spacing distance therebetween.

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

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: the Semi-FOV is greater than or equal to 61.69 degrees, wherein the Semi-FOV is half of the maximum field angle of the camera lens group. The Semi-FOV is equal to or more than 61.69 degrees, so that the camera lens group has wide visual field to clearly image a larger visual field range.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: -3.9 ≦ f1/f < -2.5, where f is the total effective focal length of the image capturing lens group, and f1 is the effective focal length of the first lens. More specifically, f1 and f further satisfy: -3.9 ≦ f1/f < -2.8. Satisfies f1/f which is more than or equal to-3.9 and less than-2.5, and can ensure that the camera lens group has wide visual field so as to carry out clear imaging on a larger visual field range. In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: -2.2 < (f5+ f6)/f < -1.4, wherein f is the total effective focal length of the photographing lens group, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. More specifically, f5, f6, and f further satisfy: -2.1 < (f5+ f6)/f < -1.7. Satisfies-2.2 < (f5+ f6)/f < -1.4, is favorable for better balancing the aberration of the photographing lens group and simultaneously is favorable for improving the resolving power of the lens group.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: -1.6 < R1/f < -1.4, where f is the total effective focal length of the image capturing lens group and R1 is the radius of curvature of the object side surface of the first lens. Satisfies-1.6 < R1/f < -1.4, can reduce the curvature of field and distortion of the camera lens group, and can reduce the processing difficulty of the first lens.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.5 < DT31/DT21 < 0.8, where DT31 is the maximum effective radius of the object-side surface of the third lens and DT21 is the maximum effective radius of the object-side surface of the second lens. More specifically, DT31 and DT21 further satisfy: 0.6 < DT31/DT21 < 0.8. Satisfies the requirements of DT31/DT21 of 0.5 < 0.8, and is beneficial to the stability of the lens group assembly.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.2 < T12/CT1 < 0.9, wherein T12 is a distance between the first lens and the second lens on the optical axis, and CT1 is a central thickness of the first lens on the optical axis. More specifically, T12 and CT1 further satisfy: 0.5 < T12/CT1 < 0.7. The requirements that T12/CT1 is more than 0.2 and less than 0.9 are met, the processing and assembling characteristics of the lens group can be ensured, and the problems of front and rear lens interference and the like in the assembling process caused by too small gaps are avoided; meanwhile, the light deflection is favorably slowed down, the curvature of field of the camera lens group is adjusted, the sensitivity is reduced, and the better imaging quality is obtained.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 2 ≦ CT6/CT7 < 3, where CT6 is the central thickness of the sixth lens on the optical axis, and CT7 is the central thickness of the seventh lens on the optical axis. More specifically, CT6 and CT7 further satisfy: CT6/CT7 is more than or equal to 2 and less than 2.8. The requirements of 2-CT 6/CT 7-3 are met, the sixth lens and the seventh lens are easy to be formed by injection molding, the processability of an imaging system is improved, and better imaging quality is guaranteed.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.5 < ImgH/| R11+ R12| < 0.8, where ImgH is half the diagonal length of the effective pixel area on the imaging surface of the image pickup lens group, R11 is the radius of curvature of the object-side surface of the sixth lens element, and R12 is the radius of curvature of the image-side surface of the sixth lens element. More specifically, ImgH, R11, and R12 may further satisfy: 0.6 < ImgH/| R11+ R12| < 0.8. The requirements that ImgH/| R11+ R12| is more than 0.5 and less than 0.8 are met, the sensitivity of the lens group is favorably reduced, the characteristics of large field angle, high resolving power and the like are favorably realized, and meanwhile, good manufacturability is favorably ensured.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.2 < (R9-R10)/(R9+ R10) ≦ 0.56, wherein R9 is the radius of curvature of the object-side surface of the fifth lens, and R10 is the radius of curvature of the image-side surface of the fifth lens. More specifically, R9 and R10 may further satisfy: 0.4 < (R9-R10)/(R9+ R10) is less than or equal to 0.56. Satisfies the condition that 0.2 < (R9-R10)/(R9+ R10) ≦ 0.56, and is beneficial to the processing and molding of the fifth lens.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 2 < CT3/CT4 < 3, where 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: 2.2 < CT3/CT4 < 2.7. The requirements of 2 < CT3/CT4 < 3 are met, the third lens and the fourth lens are easy to be formed by injection molding, the machinability of the lens group is improved, and meanwhile, better imaging quality is guaranteed.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: -1.02 ≦ SAG12/SAG32 < -0.5, wherein SAG12 is a distance on the optical axis from an intersection point of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens, and SAG32 is a distance on the optical axis from an intersection point of the image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens. More specifically, SAG12 and SAG32 further may satisfy: -1.02 ≦ SAG12/SAG32 < -0.6. Meets the requirements that SAG12/SAG32 is less than-0.5 and is more than or equal to-1.02, is favorable for better balancing the aberration of the camera lens group and simultaneously is favorable for improving the resolving power of the lens group.

In an exemplary embodiment, the image pickup lens group according to the present application may satisfy: 0.4 & ltsigma CT/TTL & lt 0.7, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the shooting lens group, and sigma CT is the sum of the central thicknesses on the optical axis of the first lens to the seventh lens. More specifically, Σ CT and TTL further can satisfy: sigma CT/TTL is more than 0.5 and less than 0.7. The requirement that Sigma CT/TTL is more than 0.4 and less than 0.7 is met, the lens can be easily subjected to injection molding, the machinability of the lens group is improved, and meanwhile, better imaging quality is guaranteed.

In an exemplary embodiment, a photographing lens group according to the present application further includes a stop disposed between the second lens and the third 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 visual angle, long depth of field, high imaging quality and the like. The image pickup lens group according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above seven lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging lens is more beneficial to production and processing.

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 seventh 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 in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, fifth, sixth, and seventh 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 seven lenses are exemplified in the embodiment, the image pickup lens group is not limited to include seven 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 2D. 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 first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a convex 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 positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

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 2.26mm, 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 S17 of the image-taking lens group) is 5.85mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image-taking lens group is 3.63mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 61.69 °, and the aperture value Fno of the image-taking lens group is 2.28.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 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 rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; 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 S14 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

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. Fig. 2D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 1, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the image capturing lens assembly of embodiment 1 can achieve good image 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 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. 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 first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative 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 convex 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 positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image-taking lens group is 2.13mm, the total length TTL of the image-taking lens group is 5.81mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the image-taking lens group is 3.63mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 64.48 °, and the aperture value Fno of the image-taking lens group is 2.28.

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

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. Fig. 4D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, 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 6D. 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 first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative 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 positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image-taking lens group is 2.13mm, the total length TTL of the image-taking lens group is 5.72mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the image-taking lens group is 3.63mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 64.03 °, and the aperture value Fno of the image-taking lens group is 2.28.

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

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. Fig. 6D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the image capturing lens assembly of embodiment 3 can achieve good image quality.

Example 4

A photographing lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. 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 first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a convex 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 concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image-taking lens group is 2.15mm, the total length TTL of the image-taking lens group is 5.71mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the image-taking lens group is 3.63mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 63.71 °, and the aperture value Fno of the image-taking lens group is 2.28.

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). Tables 8-1, 8-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 4, respectively, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.4720E-01

-3.6015E-01

7.9049E-01

-1.5317E+00

2.2390E+00

-2.4003E+00

1.8885E+00

S2

3.3731E-01

-6.1918E-02

-3.8668E+00

3.6765E+01

-2.0106E+02

7.3500E+02

-1.8795E+03

S3

1.0488E-01

-8.5604E-01

5.4958E+00

-2.6192E+01

6.4006E+01

7.2790E+01

-1.1992E+03

S4

9.2942E-03

1.3518E+00

-3.9494E+01

6.0517E+02

-5.9572E+03

4.0334E+04

-1.9384E+05

S5

1.2657E-01

-9.2639E+00

3.3255E+02

-7.5998E+03

1.1665E+05

-1.2487E+06

9.5395E+06

S6

1.3536E-01

-2.8799E+00

4.9418E+01

-5.7353E+02

4.5335E+03

-2.5062E+04

9.9091E+04

S7

7.5072E-02

-7.1112E-01

2.7800E+00

-6.4454E+00

7.3142E+00

1.0363E+01

-7.7104E+01

S8

7.9086E-02

-5.7013E-01

1.6036E+00

-5.8190E+00

3.2052E+01

-1.4491E+02

4.5306E+02

S9

-6.5159E-02

-8.7380E-02

-2.2348E+00

2.1514E+01

-1.1249E+02

3.9941E+02

-1.0059E+03

S10

-8.9720E-02

-4.1287E-03

7.7769E-02

-5.6842E-01

2.8571E+00

-7.5650E+00

1.2250E+01

S11

8.9780E-02

-5.2014E-01

2.4356E+00

-7.6605E+00

1.6606E+01

-2.5490E+01

2.8185E+01

S12

-4.1488E-01

3.1250E+00

-1.1415E+01

2.7548E+01

-4.6662E+01

5.7092E+01

-5.1178E+01

S13

1.3765E-01

-4.9248E-01

6.5204E-01

-5.8971E-01

4.1490E-01

-2.3650E-01

1.0718E-01

S14

-3.5166E-02

-1.0383E-01

1.5541E-01

-1.1922E-01

6.0808E-02

-2.2465E-02

6.2376E-03

TABLE 8-1

TABLE 8-2

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. Fig. 8D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the imaging lens assembly according to embodiment 4 can achieve good imaging quality.

Example 5

A photographing lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. 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 first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave 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 positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image-taking lens group is 2.18mm, the total length TTL of the image-taking lens group is 5.71mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image-taking lens group is 3.53mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 62.15 °, and the aperture value Fno of the image-taking lens group is 2.28.

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). Tables 10-1, 10-2 show the 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 the formula (1) given in example 1 above.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

2.3984E-01

-2.0767E-01

1.6271E-01

6.9332E-03

-3.0476E-01

5.7369E-01

-6.2735E-01

S2

3.6761E-01

-6.2755E-01

2.7890E+00

-1.2714E+01

4.3541E+01

-1.0600E+02

1.8401E+02

S3

-1.0601E-01

4.3568E+00

-6.8457E+01

6.4681E+02

-4.0664E+03

1.7818E+04

-5.5847E+04

S4

-1.6138E-01

6.3713E+00

-1.3790E+02

1.8984E+03

-1.7713E+04

1.1663E+05

-5.5482E+05

S5

9.7333E-01

-6.7261E+01

2.5070E+03

-5.9355E+04

9.4699E+05

-1.0578E+07

8.4662E+07

S6

1.2667E-01

-2.0387E+00

3.0489E+01

-3.1581E+02

2.2516E+03

-1.1155E+04

3.8911E+04

S7

7.3772E-02

-7.2905E-01

3.0613E+00

-8.4079E+00

1.8117E+01

-3.8094E+01

9.8603E+01

S8

8.1902E-02

-5.1204E-01

6.6748E-01

1.7443E+00

-9.6682E+00

1.8613E+01

-8.7901E+00

S9

-5.4583E-02

-2.2305E-01

-2.6827E-01

4.0653E+00

-8.8596E+00

-1.7616E+01

1.4626E+02

S10

-9.0705E-02

-9.3618E-02

4.0138E-01

-6.6428E-01

4.7777E-01

3.5962E-01

-1.3448E+00

S11

8.1923E-02

-2.2878E-01

4.7794E-01

-7.3473E-01

6.3174E-01

2.2297E-01

-1.4513E+00

S12

6.6847E-02

-2.5934E-01

2.0994E+00

-7.5167E+00

1.5836E+01

-2.2050E+01

2.1406E+01

S13

5.0456E-02

-2.1734E-01

2.2839E-01

-1.5751E-01

8.1202E-02

-3.2142E-02

9.7064E-03

S14

-4.6893E-02

-6.3050E-02

1.1833E-01

-1.1069E-01

6.8687E-02

-3.0019E-02

9.4499E-03

TABLE 10-1

TABLE 10-2

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 angles of view. Fig. 10D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, 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 12D. 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 first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex 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 concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image-taking lens group is 2.15mm, the total length TTL of the image-taking lens group is 5.72mm, the half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 of the image-taking lens group is 3.63mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 64.28 °, and the aperture value Fno of the image-taking lens group is 2.28.

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. Fig. 12D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 6, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, 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 14D. 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 first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17.

The first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a convex 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 positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a concave object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.

In this example, the total effective focal length f of the image-taking lens group is 2.13mm, the total length TTL of the image-taking lens group is 5.79mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S17 of the image-taking lens group is 3.63mm, the half Semi-FOV of the maximum field angle of the image-taking lens group is 64.38 °, and the aperture value Fno of the image-taking lens group is 2.28.

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

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. Fig. 14D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 7, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14A to 14D, 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.

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 (10)

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

a first lens having a negative refractive power, an object side surface of which is a concave surface;

a second lens having an optical power;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens element having a negative refractive power, the object-side surface of which is convex;

a sixth lens having a refractive power, an object side surface of which is concave; and

a seventh lens having optical power;

half of the Semi-FOV of the maximum field angle of the image pickup lens group satisfies: Semi-FOV is greater than or equal to 61.69 degrees; and

the total effective focal length f of the image pickup lens group and the effective focal length f1 of the first lens satisfy: -3.9 ≦ f1/f < -2.5.

2. The imaging lens group of claim 1, wherein the total effective focal length f of the imaging lens group, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.2 < (f5+ f6)/f < -1.4.

3. The imaging lens group of claim 1, wherein the total effective focal length f of the imaging lens group and the radius of curvature R1 of the object side surface of the first lens satisfy: -1.6 < R1/f < -1.4.

4. The imaging lens group of claim 1, wherein the maximum effective radius DT31 of the object side surface of the third lens and the maximum effective radius DT21 of the object side surface of the second lens satisfy: 0.5 < DT31/DT21 < 0.8.

5. The imaging lens group of claim 1, wherein a separation distance T12 between the first and second lenses on the optical axis and a center thickness CT1 of the first lens on the optical axis satisfy: 0.2 < T12/CT1 < 0.9.

6. The imaging lens group of claim 1, wherein a central thickness CT6 of the sixth lens on the optical axis and a central thickness CT7 of the seventh lens on the optical axis satisfy: 2 is less than or equal to CT6/CT7 is less than 3.

7. The imaging lens group of claim 1, wherein ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the imaging lens group, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: 0.5 < ImgH/| R11+ R12| < 0.8.

8. The imaging lens group of claim 1, wherein the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: 0.2 < (R9-R10)/(R9+ R10) is less than or equal to 0.56.

9. 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: 2 < CT3/CT4 < 3.

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

a first lens having a negative refractive power, an object side surface of which is a concave surface;

a second lens having an optical power;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens element having a negative refractive power, the object-side surface of which is convex;

a sixth lens having a refractive power, an object side surface of which is concave; and

a seventh lens having optical power;

half of the Semi-FOV of the maximum field angle of the image pickup lens group satisfies: Semi-FOV is greater than or equal to 61.69 degrees; and

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: 2 < CT3/CT4 < 3.

Images