CN114647063B

CN114647063B - Imaging lens group

Info

Publication number: CN114647063B
Application number: CN202210319590.9A
Authority: CN
Inventors: 王旭; 邢天祥; 黄林; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2023-09-22
Anticipated expiration: 2042-03-29
Also published as: CN114647063A

Abstract

The invention provides an imaging lens group. The imaging lens group sequentially comprises six lenses from an object side to an image side: a first lens having positive optical power; a second lens with negative focal power, the object side of which is a concave surface; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface is a convex surface; a sixth lens having negative optical power; when balancing high-frequency performance, the aperture value Fno1 of the imaging lens group satisfies: fno1<2.0; when balancing low frequency performance, the aperture value Fno2 of the imaging lens group satisfies: fno2>2.2. The invention solves the problem that the imaging lens group in the prior art has large image plane, large aperture and ultra-thin effect and is difficult to realize simultaneously.

Description

Imaging lens group

Technical Field

The invention relates to the technical field of optical imaging equipment, in particular to an imaging lens group.

Background

In recent years, with popularization of smart phones, the mobile phone industry is actively developing, and various demands of the masses on mobile phones are continuously improved, and a photographing function of the mobile phones becomes an important factor for people to purchase the mobile phones, so that mobile phone manufacturers put forward more new demands on imaging lens groups on the mobile phones. The imaging lens group on the current mobile phone has the development trend of large image plane, large aperture and ultra-thin, greatly increases the difficulty of optical design, and particularly needs to combine modes such as image algorithm and the like to realize the lens characteristic.

Compared with the common imaging lens group of the mobile phone, the imaging capability of the imaging lens group of the mobile phone is improved and the competitive advantage in the industry is also increased by the design parameter requirement. The large image plane can improve the resolution of the system; the large aperture can increase the light entering quantity so as to improve the capability of the imaging lens group to shoot night scenes; the ultrathin characteristic can enable the lens to be well fused with the machine body, and is favorable for light weight, thin and miniaturization. Based on the above requirements of mobile phone providers, conventional design approaches are insufficient to effectively address these challenges, and need to be implemented in combination with new design ideas.

That is, the imaging lens group in the prior art has a problem that large image plane, large aperture and ultra-thin are difficult to be realized simultaneously.

Disclosure of Invention

The invention mainly aims to provide an imaging lens group so as to solve the problem that the imaging lens group in the prior art has a large image plane, a large aperture and ultra-thin performance and is difficult to realize simultaneously.

In order to achieve the above object, according to one aspect of the present invention, there is provided an imaging lens group including, in order from an object side to an image side, six lenses: a first lens having positive optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface is a convex surface; a sixth lens having negative optical power; when balancing high-frequency performance, the aperture value Fno1 of the imaging lens group satisfies: fno1<2.0; when balancing low frequency performance, the aperture value Fno2 of the imaging lens group satisfies: fno2>2.2.

Further, the on-axis distance TTL from the object side surface of the first lens element to the imaging surface and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH <1.2.

Further, the maximum field angle FOV of the imaging lens group satisfies: 80 DEG < FOV < 90 deg.

Further, the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the imaging lens set satisfy: -3.5 < R3/f < -1.5.

Further, the effective focal length f3 of the third lens and the effective focal length f of the imaging lens set satisfy: f3/f is more than 10.0 and less than 17.0.

Further, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -6.0 < f3/f2 < -3.0.

Further, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -4.0 < f4/f5 < -3.0.

Further, the radius of curvature R5 of the object side surface of the third lens and the effective focal length f of the imaging lens group satisfy: r5/f is more than 2.5 and less than 7.0.

Further, the curvature radius R12 of the image side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy: r12/f6 is more than 1.0 and less than 2.0.

Further, the center thickness CT2 of the second lens on the optical axis and the air interval T23 of the second lens and the third lens on the optical axis satisfy: T23/CT2 is more than 1.0 and less than 3.0.

Further, an on-axis distance SAG32 between an intersection point of the image side surface of the third lens and the optical axis and an effective radius vertex of the image side surface of the third lens and an on-axis distance SAG61 between an intersection point of the object side surface of the sixth lens and the optical axis and an effective radius vertex of the object side surface of the sixth lens satisfy: 4.0 < SAG61/SAG32 < 5.5.

Further, an on-axis distance SAG41 between an intersection point of the object side surface of the fourth lens and the optical axis and an effective radius vertex of the object side surface of the fourth lens and an on-axis distance SAG62 between an intersection point of the image side surface of the sixth lens and the optical axis and an effective radius vertex of the image side surface of the sixth lens satisfy: 2.0 < SAG62/SAG41 < 3.0.

Further, the combined focal length f23 of the second lens and the third lens and the effective focal length f of the imaging lens set satisfy: -4.5 < f23/f < -3.5.

According to another aspect of the present invention, there is provided an imaging lens group comprising, in order from an object side to an image side, six lenses: a first lens having positive optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface is a convex surface; a sixth lens having negative optical power; when balancing high-frequency performance, the aperture value Fno1 of the imaging lens group satisfies: fno1<2.0; the on-axis distance TTL from the object side surface to the imaging surface of the first lens element and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH <1.2.

Further, when balancing low frequency performance, the aperture value Fno2 of the imaging lens set satisfies: fno2>2.2; the maximum field angle FOV of the imaging lens group satisfies: 80 DEG < FOV < 90 deg.

By applying the technical scheme of the invention, the imaging lens group sequentially comprises six lenses from an object side to an image side: a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, a fourth lens having negative optical power, a fifth lens having positive optical power, and a sixth lens having negative optical power; the object side surface of the fifth lens is a convex surface, and the image side surface is a convex surface; when balancing high-frequency performance, the aperture value Fno1 of the imaging lens group satisfies: fno1<2.0; when balancing low frequency performance, the aperture value Fno2 of the imaging lens group satisfies: fno2>2.2.

The focal power of each lens is reasonably restrained, so that smooth transition of light rays is facilitated, and final imaging quality is guaranteed. When the high-frequency performance is controlled to be balanced, the aperture value FNo1 of the imaging lens group is less than 2.0, so that larger light entering quantity can be obtained, the illuminance of an imaging surface and the response of a chip can be improved, and the power consumption of the system can be reduced. When the low-frequency performance is balanced, the aperture value Fno2 of the imaging lens set is more than 2.2, so as to properly reduce the low-frequency performance and pull up the difference between the high-frequency performance and the low-frequency performance. The six-piece imaging lens group with a large image surface, a large aperture and ultra-thin structure provided by the application can effectively achieve high and low frequency performance by utilizing the optimization mode of double apertures, and meets the algorithm requirement and the application requirement of a main camera on a high-end smart phone.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a schematic diagram of an imaging lens set according to example one of the present application;

FIGS. 2-5 show on-axis, astigmatic, distortion, and power chromatic curves, respectively, of the imaging lens set of FIG. 1;

FIG. 6 shows a schematic diagram of an imaging lens set of example two of the present invention;

fig. 7 to 10 show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the imaging lens group of fig. 6;

FIG. 11 shows a schematic structural view of an imaging lens set of example three of the present invention;

FIGS. 12-15 show on-axis, astigmatic, distortion, and power chromatic curves, respectively, of the imaging lens set of FIG. 11;

FIG. 16 shows a schematic of the structure of an imaging lens set of example four of the present invention;

fig. 17 to 20 show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the imaging lens group of fig. 16;

FIG. 21 shows a schematic diagram of the structure of an imaging lens set of example five of the present invention;

FIGS. 22-25 show on-axis, astigmatic, distortion, and power chromatic curves, respectively, of the imaging lens set of FIG. 21;

FIG. 26 shows a schematic diagram of the structure of an imaging lens set of example six of the present invention;

FIGS. 27-30 show on-axis, astigmatic, distortion, and power chromatic curves, respectively, of the imaging lens set of FIG. 26;

Fig. 31 shows a high-low frequency MTF plot for an imaging lens set of an alternative example.

Wherein the above figures include the following reference numerals:

STO and diaphragm; e1, a first lens; s1, an object side surface of a first lens; s2, an image side surface of the first lens; e2, a second lens; s3, the object side surface of the second lens; s4, the image side surface of the second lens; e3, a third lens; s5, the object side surface of the third lens; s6, the image side surface of the third lens; e4, a fourth lens; s7, the object side surface of the fourth lens; s8, the image side surface of the fourth lens is provided; e5, a fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of a fifth lens; e6, a sixth lens;

s11, the object side surface of the sixth lens; s12, an image side surface of the sixth lens; e7, an optical filter; s13, the object side surface of the optical filter; s14, an image side surface of the optical filter; s15, an imaging surface.

Detailed Description

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

It is noted that all 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 unless otherwise indicated.

In the present application, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present application.

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

In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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 near the object side becomes the object side of the lens, and the surface of each lens near the image side is called the image side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.

In order to solve the problem that the imaging lens group in the prior art has a large image plane, a large aperture and ultra-thin effect and is difficult to realize simultaneously, the application provides an imaging lens group.

Example 1

As shown in fig. 1 to 31, the imaging lens group includes six lenses in order from an object side to an image side: a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, a fourth lens having negative optical power, a fifth lens having positive optical power, and a sixth lens having negative optical power; the object side surface of the fifth lens is a convex surface, and the image side surface is a convex surface; when balancing high-frequency performance, the aperture value Fno1 of the imaging lens group satisfies: fno1<2.0; when balancing low frequency performance, the aperture value Fno2 of the imaging lens group satisfies: fno2>2.2.

In this embodiment, the on-axis distance TTL from the object side surface of the first lens element to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH <1.2. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal line length of the effective pixel area on the imaging surface is in a reasonable range, so that the overall length of the system of the imaging lens group is reduced as much as possible while the large imaging surface is ensured, and the ultra-thin effect of the imaging lens group is ensured.

In this embodiment, the maximum field angle FOV of the imaging lens group satisfies: 80 DEG < FOV < 90 deg. The maximum field angle FOV of the imaging lens group is reasonably restrained, so that a larger field range is obtained, and the capturing capability of the imaging lens group on object space information can be improved. Preferably 89 < FOV < 90.

In this embodiment, the radius of curvature R3 of the object side surface of the second lens and the effective focal length f of the imaging lens group satisfy: -3.5 < R3/f < -1.5. The optical power of the system can be reasonably distributed by meeting the conditional expression, and the astigmatism generated by the front-end optical lens and the rear-end optical lens of the system can be balanced, so that the system has good imaging quality. Preferably, -3.3 < R3/f < -1.9.

In the present embodiment, the effective focal length f3 of the third lens and the effective focal length f of the imaging lens set satisfy: f3/f is more than 10.0 and less than 17.0. The residual spherical aberration generated by the rear lens of the optical system can be balanced by meeting the conditional expression, so that the axial aberration is smaller, and good imaging quality can be obtained. Preferably, 10.0 < f3/f < 16.8.

In this embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -6.0 < f3/f2 < -3.0. The ratio of the effective focal lengths of the second lens and the third lens can be reasonably restrained by meeting the conditional expression, so that the field curvature contribution quantity of the two lenses is reasonably controlled, and the two lenses are balanced in a reasonable state. Preferably, -5.6 < f3/f2 < -3.2.

In the present embodiment, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -4.0 < f4/f5 < -3.0. The method meets the conditional expression, can reduce the deflection angle of light rays and improve the imaging quality of the imaging lens group. Preferably, -3.8 < f4/f5 < -3.1.

In the present embodiment, the radius of curvature R5 of the object side surface of the third lens element and the effective focal length f of the imaging lens group satisfy: r5/f is more than 2.5 and less than 7.0. The astigmatism of the imaging lens group can be effectively controlled by meeting the conditional expression, and the imaging quality of the off-axis visual field can be improved. Preferably, 2.8 < R5/f < 6.8.

In the present embodiment, the curvature radius R12 of the image side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy: r12/f6 is more than 1.0 and less than 2.0. The method can control the third-order coma aberration within a reasonable range, and balance the coma aberration generated by the front-end optical lens, so that the imaging lens group has good imaging quality. Preferably, 1.4 < R12/f6 < 1.6.

In the present embodiment, the center thickness CT2 of the second lens on the optical axis and the air interval T23 of the second lens and the third lens on the optical axis satisfy: T23/CT2 is more than 1.0 and less than 3.0. The position of the second lens can be effectively limited by meeting the conditional expression, the compactness of the imaging lens group structure is facilitated, off-axis aberration is corrected, and the overall image quality of the imaging lens group is improved. Preferably, 1.1 < T23/CT2 < 2.8.

In the present embodiment, an on-axis distance SAG32 between an intersection point of the image side surface of the third lens and the optical axis and an effective radius vertex of the image side surface of the third lens and an on-axis distance SAG61 between an intersection point of the object side surface of the sixth lens and the optical axis and an effective radius vertex of the object side surface of the sixth lens satisfy: 4.0 < SAG61/SAG32 < 5.5. The sensitivity of the third lens and the sixth lens is reduced by meeting the conditional expression, and the lens is convenient to process and mold. Preferably, 4.1 < SAG61/SAG32 < 5.2.

In the present embodiment, an on-axis distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens and an on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the effective radius vertex of the image side surface of the sixth lens satisfy: 2.0 < SAG62/SAG41 < 3.0. The condition is satisfied, the ghost images generated by the fourth lens and the sixth lens can be effectively avoided, and the ghost image risk of the system is reduced. Preferably, 2.2 < SAG62/SAG41 < 2.7.

In the present embodiment, the combined focal length f23 of the second lens and the third lens and the effective focal length f of the imaging lens set satisfy: -4.5 < f23/f < -3.5. The lens focal power adjusting device meets the conditional expression, can reasonably control the contribution range of the focal power, and simultaneously reasonably control the contribution rate of the spherical aberration of the lens focal power, so that the lens focal power can be reasonably balanced. Preferably, -4.5 < f23/f < -3.6.

Example two

As shown in fig. 1 to 31, the imaging lens group includes six lenses in order from an object side to an image side: a first lens having positive optical power; a second lens having negative optical power; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface is a convex surface; a sixth lens having negative optical power; when balancing high-frequency performance, the aperture value Fno1 of the imaging lens group satisfies: fno1<2.0; the on-axis distance TTL from the object side surface to the imaging surface of the first lens element and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL/ImgH <1.2.

The focal power of each lens is reasonably restrained, so that smooth transition of light rays is facilitated, and final imaging quality is guaranteed. When the high-frequency performance is controlled to be balanced, the aperture value FNo1 of the imaging lens group is less than 2.0, so that larger light entering quantity can be obtained, the illuminance of an imaging surface and the response of a chip can be improved, and the power consumption of the system can be reduced. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal line length of the effective pixel area on the imaging surface is in a reasonable range, so that the overall length of the system of the imaging lens group is reduced as much as possible while the large imaging surface is ensured, and the ultra-thin effect of the imaging lens group is ensured. The six-piece imaging lens group with a large image surface, a large aperture and ultra-thin structure provided by the application can effectively achieve high and low frequency performance by utilizing the optimization mode of double apertures, and meets the algorithm requirement and the application requirement of a main camera on a high-end smart phone.

In this embodiment, when balancing the low frequency performance, the aperture value Fno2 of the imaging lens group satisfies: fno2>2.2. When the low-frequency performance is balanced, the aperture value Fno2 of the imaging lens set is more than 2.2, so as to properly reduce the low-frequency performance and pull up the difference between the high-frequency performance and the low-frequency performance.

The imaging lens group may optionally further include a filter for correcting color deviation or a protective glass for protecting a photosensitive element located on the imaging surface.

The imaging lens set in the present application may employ a plurality of lenses, such as the six lenses described above. The imaging lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones and the like by reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of each lens. The imaging lens group has the advantages of ultra-thin and good imaging quality, and can meet the miniaturization requirement of intelligent electronic products.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.

However, those skilled in the art will appreciate that the number of lenses making up an imaging lens set can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although six lenses are described as examples in the embodiment, the imaging lens group is not limited to include six lenses. The imaging lens set may also include other numbers of lenses, if desired.

Examples of specific aspects and parameters applicable to the imaging lens set of the above embodiment are further described below with reference to the accompanying drawings.

Any of the following examples one to six is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 5, an imaging lens group according to an example one of the present application is described. Fig. 1 shows a schematic view of an imaging lens group structure of example one.

As shown in fig. 1, the imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, optical filter E7 and imaging surface S15.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has negative refractive power, wherein the object-side surface S3 of the second lens element is concave, and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is concave, and the image-side surface S12 of the sixth lens element is convex. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the imaging lens group is 5.16mm, the maximum half field angle Semi-FOV of the imaging lens group is 44.8 ° the total length TTL of the imaging lens group is 5.87mm and the image height ImgH is 5.27mm.

Table 1 shows a basic structural parameter table for the imaging lens set of example one, in which the radius of curvature, thickness/distance are all in millimeters (mm).

TABLE 1

In the first example, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspheric, and the surface shape of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=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 aspherical i-th order. The following Table 2 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S12 in example one.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-1.8411E-02

-1.1697E-02

-4.6521E-03

-1.1693E-03

-1.6977E-04

5.1332E-05

2.4834E-05

S2

-8.2758E-02

-3.3565E-03

-4.1365E-04

2.5198E-04

4.5192E-04

3.7475E-04

2.0308E-04

S3

4.8174E-02

2.0240E-02

-3.5084E-04

6.6499E-04

1.6790E-04

1.2518E-04

1.5756E-04

S4

7.4980E-02

1.6464E-02

-1.9700E-04

3.7139E-04

7.1043E-05

-1.2558E-05

-2.1424E-05

S5

-1.3721E-01

-4.1951E-03

-1.5599E-03

3.5750E-04

1.7719E-04

1.2595E-04

1.1388E-05

S6

-2.2163E-01

-7.1882E-03

-1.0947E-06

2.1900E-03

9.9016E-04

5.3580E-04

1.5124E-04

S7

-7.2263E-01

2.9968E-02

-2.2085E-02

6.5869E-03

1.7113E-04

2.7561E-03

1.4599E-05

S8

-1.3492E+00

2.9578E-01

-5.7585E-02

5.8283E-03

-5.8820E-03

5.5562E-03

-1.9498E-03

S9

-2.8175E+00

4.9772E-01

3.2305E-02

-3.9639E-02

-1.0595E-02

2.6028E-02

-1.3025E-02

S10

-3.8452E-01

-2.4205E-01

7.7443E-02

-2.3548E-03

6.2648E-03

1.8806E-02

-3.7346E-03

S11

5.8557E+00

-9.9492E-01

2.0140E-01

2.8690E-03

-4.5811E-02

3.1169E-02

-1.1252E-02

S12

1.1445E+00

-6.8811E-02

1.6730E-01

-7.1208E-02

5.1852E-03

4.2078E-03

-3.1803E-03

Face number

A18

A20

A22

A24

A26

A28

A30

S1

5.9591E-06

-7.2102E-06

0.0000E+00

S2

5.8078E-05

3.0771E-06

0.0000E+00

S3

8.3320E-05

2.2108E-05

0.0000E+00

S4

-5.7344E-06

-6.1397E-06

0.0000E+00

S5

6.1671E-06

-5.0403E-06

0.0000E+00

S6

4.5328E-05

-2.7358E-06

-8.7128E-06

0.0000E+00

S7

-1.1642E-04

-4.8142E-04

-2.2665E-04

-1.2118E-04

-2.5234E-05

0.0000E+00

S8

1.5580E-04

-2.8645E-04

3.0546E-04

-5.9223E-05

-2.9668E-05

-1.4419E-05

1.1014E-05

S9

8.1850E-05

1.8088E-03

5.3890E-05

-5.9253E-04

1.0941E-04

1.4064E-04

-6.6152E-05

S10

6.9722E-03

-2.2823E-03

-2.2707E-03

3.9590E-04

-5.2311E-04

-2.8228E-06

-1.0213E-04

S11

-4.4844E-03

4.2468E-03

2.2291E-04

-2.3580E-03

1.8672E-03

-7.7954E-04

1.1920E-04

S12

1.0415E-03

-2.5372E-03

-2.8291E-04

1.4288E-05

1.5659E-03

-5.0042E-04

0.0000E+00

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve for an imaging lens set of example one, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 3 shows an astigmatic curve of an imaging lens set of example one, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4 shows a distortion curve for an imaging lens set of example one, which represents distortion magnitude values corresponding to different field angles. Fig. 5 shows a chromatic aberration of magnification curve of an imaging lens set of example one, which represents the deviation of different image heights on an imaging plane after light passes through the imaging lens set.

As can be seen from fig. 2 to 5, the imaging lens set of example one can achieve good imaging quality.

Example two

As shown in fig. 6 to 10, an imaging lens set of example two of the present application is described. In this example and the following examples, a description of portions similar to those of example one will be omitted for the sake of brevity. Fig. 6 shows a schematic diagram of the imaging lens set structure of example two.

As shown in fig. 6, the imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, optical filter E7 and imaging surface S15.

In this example, the total effective focal length f of the imaging lens group is 5.17mm, the maximum half field angle Semi-FOV of the imaging lens group is 44.9 ° the total length TTL of the imaging lens group is 5.87mm and the image height ImgH is 5.27mm.

Table 3 shows a basic structural parameter table for the imaging lens set of example two, wherein the radius of curvature, thickness/distance are in millimeters (mm).

TABLE 3 Table 3

Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example two, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-1.7931E-02

-1.1609E-02

-4.6626E-03

-1.0719E-03

-1.1640E-04

5.6156E-05

-5.1408E-06

S2

-8.1805E-02

-4.1313E-03

-3.2699E-04

8.7260E-05

2.0970E-04

3.5023E-04

3.3464E-04

S3

4.8378E-02

1.9358E-02

-2.7481E-04

5.9899E-04

-3.4536E-05

-4.7324E-06

1.5643E-04

S4

7.4909E-02

1.6297E-02

-2.6169E-04

3.2943E-04

7.2049E-05

-1.3112E-05

-8.9931E-06

S5

1.6681E-01

-1.2038E-02

2.3708E-04

3.2157E-03

-2.0176E-03

9.8104E-04

-3.5457E-04

S6

2.1148E-01

2.0635E-02

-2.9824E-02

2.1278E-02

-1.0443E-02

4.3699E-03

-1.2990E-03

S7

5.1477E-01

1.4039E-02

-1.8266E-02

3.8266E-02

-1.5353E-02

2.9880E-03

8.6816E-03

S8

-1.6665E-02

1.5366E-01

1.1310E-01

2.8157E-04

-9.4371E-03

7.1624E-03

8.6882E-03

S9

-9.2375E-03

7.4122E-01

1.6595E-01

-1.1117E-01

-9.3487E-02

1.2253E-02

5.4672E-02

S10

6.9625E-01

3.2994E-01

-3.9543E-01

1.6972E-01

-1.6891E-01

4.9680E-02

1.1123E-02

S11

-1.3802E+00

-6.2080E-01

-3.3776E-01

-2.3684E-01

1.1793E-02

3.1645E-02

7.1994E-02

S12

-5.4042E-01

1.8762E-01

1.4258E-01

-2.1462E-01

-1.0820E-02

-3.6245E-02

2.9025E-02

Face number

A18

A20

A22

A24

A26

A28

A30

S1

-1.5579E-05

-1.7690E-05

0.0000E+00

S2

1.7009E-04

3.5632E-05

0.0000E+00

S3

1.3151E-04

4.9425E-05

0.0000E+00

S4

2.9165E-06

2.1795E-06

0.0000E+00

S5

1.4143E-04

-3.9382E-05

0.0000E+00

S6

3.0757E-04

-2.9047E-06

-6.4275E-08

0.0000E+00

S7

-7.8862E-03

5.7996E-03

-2.4946E-03

9.5780E-04

-2.0964E-04

0.0000E+00

S8

3.8491E-04

-2.2882E-04

8.0013E-04

8.5048E-04

-1.4040E-04

-1.8973E-04

1.3875E-04

S9

1.5917E-02

-7.7991E-03

-4.2179E-03

2.2526E-03

1.9367E-03

-4.4906E-04

-5.3110E-04

S10

-1.1270E-02

4.1750E-02

-1.3206E-02

3.1264E-04

-3.3332E-03

4.3720E-04

-8.1658E-04

S11

4.8849E-03

-2.0934E-02

-1.4748E-02

2.7536E-03

7.5862E-03

4.8515E-03

9.2538E-04

S12

-1.8545E-02

9.5579E-03

5.4166E-03

-9.1976E-03

5.1848E-03

4.2834E-03

0.0000E+00

TABLE 4 Table 4

FIG. 7 shows an on-axis chromatic aberration curve for an imaging lens set of example two, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 8 shows the astigmatism curves of the imaging lens group of example two, which represent meridional image plane curvature and sagittal image plane curvature. Fig. 9 shows a distortion curve for the imaging lens set of example two, which represents distortion magnitude values corresponding to different field angles. Fig. 10 shows a chromatic aberration of magnification curve of an imaging lens set of example two, which represents the deviation of different image heights on an imaging plane after light passes through the imaging lens set.

As can be seen from fig. 7 to fig. 10, the imaging lens set provided in example two can achieve good imaging quality.

Example three

As shown in fig. 11 to 15, an imaging lens group of example three of the present application is described. Fig. 11 shows a schematic diagram of the structure of an imaging lens set of example three.

As shown in fig. 11, the imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, optical filter E7 and imaging surface S15.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 of the second lens element is concave, and an image-side surface S4 of the second lens element is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is concave, and the image-side surface S12 of the sixth lens element is convex. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 5 shows a basic structural parameter table for the imaging lens set of example three, wherein the radius of curvature, thickness/distance are in millimeters (mm).

TABLE 5

Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example three, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

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TABLE 6

Fig. 12 shows an on-axis chromatic aberration curve for the imaging lens set of example three, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 13 shows an astigmatism curve of the imaging lens group of example three, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14 shows a distortion curve for the imaging lens set of example three, which represents distortion magnitude values for different field angles. Fig. 15 shows a chromatic aberration of magnification curve for an imaging lens set of example three, which represents the deviation of different image heights on the imaging plane after light passes through the imaging lens set.

As can be seen from fig. 12 to 15, the imaging lens set given in example three can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an imaging lens group of example four of the present application is described. Fig. 16 shows a schematic view of the structure of an imaging lens set of example four.

As shown in fig. 16, the imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, optical filter E7 and imaging surface S15.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave. The second lens element E2 has negative refractive power, wherein the object-side surface S3 of the second lens element is concave, and the image-side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex, and an image-side surface S10 of the fifth lens element is convex. The sixth lens element E6 has negative refractive power, and the object-side surface S11 of the sixth lens element is concave, and the image-side surface S12 of the sixth lens element is convex. The filter E7 has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 7 shows a basic structural parameter table for the imaging lens set of example four, wherein the radius of curvature, thickness/distance are in millimeters (mm).

TABLE 7

Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example four, where each of the aspherical surface types can be defined by the formula (1) given in example one above.

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TABLE 8

Fig. 17 shows an on-axis chromatic aberration curve for the imaging lens set of example four, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 18 shows an astigmatism curve of the imaging lens group of example four, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 19 shows a distortion curve of the imaging lens group of example four, which represents distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve for an imaging lens set of example four, which represents the deviation of different image heights on the imaging plane after light passes through the imaging lens set.

As can be seen from fig. 17 to 20, the imaging lens set provided in example four can achieve good imaging quality.

Example five

As shown in fig. 21 to 25, an imaging lens group of example five of the present application is described. Fig. 21 shows a schematic diagram of an imaging lens set configuration of example five.

As shown in fig. 21, the imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, optical filter E7 and imaging surface S15.

In this example, the total effective focal length f of the imaging lens group is 5.16mm, the maximum half field angle Semi-FOV of the imaging lens group is 44.9 ° the total length TTL of the imaging lens group is 5.87mm and the image height ImgH is 5.27mm.

Table 9 shows a basic structural parameter table for the imaging lens set of example five, wherein the radius of curvature, thickness/distance are in millimeters (mm).

TABLE 9

Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example five, where each of the aspherical surface types can be defined by equation (1) given in example one above.

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Table 10

Fig. 22 shows an on-axis chromatic aberration curve for the imaging lens set of example five, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 23 shows an astigmatism curve of the imaging lens group of example five, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 24 shows a distortion curve of the imaging lens group of example five, which represents distortion magnitude values corresponding to different angles of view. Fig. 25 shows a chromatic aberration of magnification curve for the imaging lens set of example five, which represents the deviation of different image heights on the imaging plane after light passes through the imaging lens set.

As can be seen from fig. 22 to 25, the imaging lens set provided in example five can achieve good imaging quality.

Example six

As shown in fig. 26 to 30, an imaging lens group of example six of the present application is described. Fig. 26 shows a schematic diagram of the imaging lens set structure of example six.

As shown in fig. 26, the imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, optical filter E7 and imaging surface S15.

Table 11 shows a basic structural parameter table for the imaging lens set of example six, wherein the radius of curvature, thickness/distance are in millimeters (mm).

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TABLE 11

Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example six, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-1.8264E-02

-1.1801E-02

-4.6557E-03

-1.1385E-03

-1.1914E-04

6.9365E-05

2.9081E-05

S2

-8.2068E-02

-4.0275E-03

-4.2305E-04

1.7847E-04

3.9332E-04

4.5069E-04

3.0631E-04

S3

4.8897E-02

1.9697E-02

-1.5998E-04

6.0123E-04

4.3258E-05

2.3115E-05

1.2443E-04

S4

7.4668E-02

1.6374E-02

-1.7573E-04

3.8882E-04

7.3428E-05

-5.9890E-06

-1.8656E-05

S5

-1.3762E-01

-3.9916E-03

-1.6935E-03

2.5393E-04

1.5849E-04

1.0439E-04

2.2612E-05

S6

-2.2398E-01

-6.6806E-03

-6.1273E-04

2.0268E-03

8.3180E-04

4.9902E-04

1.3056E-04

S7

-7.1730E-01

3.1692E-02

-2.1972E-02

7.1113E-03

3.2569E-04

2.8928E-03

7.8825E-05

S8

-1.3468E+00

2.9586E-01

-5.7522E-02

5.9973E-03

-5.9578E-03

5.6344E-03

-1.9702E-03

S9

-2.8173E+00

4.9774E-01

3.2428E-02

-3.9635E-02

-1.0509E-02

2.6029E-02

-1.3031E-02

S10

-3.8337E-01

-2.4215E-01

7.6247E-02

-1.4841E-03

5.8220E-03

1.8697E-02

-3.5299E-03

S11

5.8481E+00

-9.9560E-01

2.0075E-01

2.2983E-03

-4.5563E-02

3.1080E-02

-1.1384E-02

S12

1.1258E+00

-8.3413E-02

1.6156E-01

-7.0586E-02

5.4208E-03

4.2837E-03

-3.1705E-03

Face number

A18

A20

A22

A24

A26

A28

A30

S1

6.1333E-06

-4.7449E-06

0.0000E+00

S2

1.1518E-04

1.2726E-05

0.0000E+00

S3

8.8457E-05

3.6904E-05

0.0000E+00

S4

-4.9387E-06

-7.2053E-06

0.0000E+00

S5

2.6488E-06

-2.0678E-07

0.0000E+00

S6

4.9579E-05

-4.1217E-06

-7.2654E-06

0.0000E+00

S7

-1.6591E-05

-4.2911E-04

-2.0016E-04

-1.0293E-04

-2.9855E-05

0.0000E+00

S8

1.7961E-04

-3.0211E-04

3.0606E-04

-5.9672E-05

-4.5899E-05

-6.5517E-06

1.3245E-05

S9

8.6314E-05

1.8152E-03

5.7931E-05

-5.7180E-04

1.0846E-04

1.3809E-04

-6.4281E-05

S10

6.8257E-03

-2.4283E-03

-2.2270E-03

6.2111E-04

-4.5439E-04

4.2873E-05

-9.4807E-05

S11

-4.6240E-03

4.0582E-03

2.7966E-04

-2.4655E-03

1.8402E-03

-7.7183E-04

1.1598E-04

S12

1.0930E-03

-2.8824E-03

-2.5629E-04

-2.0300E-04

1.4290E-03

-5.1627E-04

0.0000E+00

Table 12

Fig. 27 shows an on-axis chromatic aberration curve for an imaging lens set of example six, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging lens set. Fig. 28 shows an astigmatism curve of the imaging lens group of example six, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 29 shows a distortion curve of the imaging lens group of example six, which represents distortion magnitude values corresponding to different angles of view. Fig. 30 shows a magnification chromatic aberration curve of an imaging lens set of example six, which represents deviations of different image heights on an imaging plane after light passes through the imaging lens set.

As can be seen from fig. 27 to 30, the imaging lens set shown in example six can achieve good imaging quality.

In summary, examples one to six satisfy the relationships shown in table 13, respectively.

Condition/example	1	2	3	4	5	6
							TTL/ImgH	1.11	1.11	1.11	1.11	1.11	1.11
FOV	89.7	89.9	89.8	89.7	89.8	89.8
							Fno1	1.90	1.90	1.91	1.92	1.93	1.93
Fno2	2.25	2.35	2.36	2.33	2.31	2.38
							R3/f	-3.23	-3.22	-1.96	-3.19	-3.02	-3.01
f3/f	11.58	13.96	15.34	10.10	16.71	14.01
							f3/f2	-3.83	-4.63	-4.77	-3.29	-5.58	-4.60
f4/f5	-3.38	-3.61	-3.51	-3.19	-3.70	-3.61
							R5/f	4.08	2.93	2.92	6.70	2.81	2.90
R12/f6	1.42	1.41	1.42	1.42	1.42	1.48
							T23/CT2	1.22	2.75	1.16	1.24	1.17	1.16
SAG61/SAG32	4.54	5.07	5.02	4.19	5.19	4.68
							SAG62/SAG41	2.38	2.62	2.45	2.29	2.60	2.29
f23/f	-4.11	-3.85	-4.07	-4.47	-3.64	-3.89

Table 13 table 14 shows the effective focal lengths f of the imaging lens groups of examples one to six, and the effective focal lengths f1 to f6 of the respective lenses.

Parameters/examples	1	2	3	4	5	6
							f(mm)	5.16	5.17	5.17	5.16	5.16	5.17
f1(mm)	4.88	4.91	4.92	4.86	4.88	4.93
							f2(mm)	-15.57	-15.58	-16.62	-15.84	-15.45	-15.75
f3(mm)	59.70	72.12	79.31	52.06	86.16	72.40
							f4(mm)	-13.44	-14.38	-13.96	-12.67	-14.70	-14.37
f5(mm)	3.97	3.98	3.98	3.97	3.97	3.98
							f6(mm)	-3.46	-3.47	-3.46	-3.46	-3.47	-3.46
TTL(mm)	5.87	5.87	5.87	5.87	5.87	5.87
							ImgH(mm)	5.27	5.27	5.27	5.27	5.27	5.27
Semi-FOV(°)	44.8	44.9	44.9	44.8	44.9	44.9

TABLE 14

The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the imaging lens group described above.

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An imaging lens group, which is characterized by comprising six lenses from an object side to an image side:

a first lens having positive optical power;

a second lens having negative optical power;

a third lens having positive optical power;

a fourth lens having negative optical power;

a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;

A sixth lens having negative optical power;

wherein, when balancing high frequency performance, aperture value Fno1 of imaging lens group satisfies: fno1<2.0; when balancing low frequency performance, the aperture value Fno2 of the imaging lens group satisfies: fno2>2.2;

an on-axis distance TTL from an object side surface of the first lens to an imaging surface and a half of a diagonal length ImgH of an effective pixel area on the imaging surface satisfy: TTL/ImgH <1.2; the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the imaging lens group satisfy: -3.5 < R3/f < -1.5.

2. The imaging lens set of claim 1 wherein the imaging lens set has a maximum field angle FOV that satisfies: 80 degrees < FOV < 90 degrees.

3. The imaging lens set of claim 1, wherein an effective focal length f3 of the third lens and an effective focal length f of the imaging lens set satisfy: f3/f is more than 10.0 and less than 17.0.

4. The imaging lens set of claim 1 wherein an effective focal length f2 of the second lens and an effective focal length f3 of the third lens satisfy: -6.0 < f3/f2 < -3.0.

5. The imaging lens set of claim 1 wherein an effective focal length f4 of the fourth lens and an effective focal length f5 of the fifth lens satisfy: -4.0 < f4/f5 < -3.0.

6. The imaging lens set of claim 1, wherein a radius of curvature R5 of an object side of the third lens and an effective focal length f of the imaging lens set satisfy: r5/f is more than 2.5 and less than 7.0.

7. The imaging lens set of claim 1, wherein a radius of curvature R12 of an image side of the sixth lens and an effective focal length f6 of the sixth lens satisfy: r12/f6 is more than 1.0 and less than 2.0.

8. The imaging lens set of claim 1, wherein a center thickness CT2 of the second lens on an optical axis and an air gap T23 of the second lens and the third lens on the optical axis satisfy: T23/CT2 is more than 1.0 and less than 3.0.

9. The imaging lens set of claim 1, wherein an on-axis distance SAG32 between an intersection of an image side of the third lens and an optical axis to an effective radius vertex of the image side of the third lens and an on-axis distance SAG61 between an intersection of an object side of the sixth lens and the optical axis to an effective radius vertex of the object side of the sixth lens: 4.0 < SAG61/SAG32 < 5.5.

10. The imaging lens set of claim 1, wherein an on-axis distance SAG41 between an intersection of an object side of the fourth lens and an optical axis to an effective radius vertex of the object side of the fourth lens and an on-axis distance SAG62 between an intersection of an image side of the sixth lens and the optical axis to an effective radius vertex of the image side of the sixth lens: 2.0 < SAG62/SAG41 < 3.0.

11. The imaging lens set of claim 1, wherein a combined focal length f23 of the second lens and the third lens and an effective focal length f of the imaging lens set satisfy: -4.5 < f23/f < -3.5.

12. An imaging lens group, which is characterized by comprising six lenses from an object side to an image side:

a first lens having positive optical power;

a second lens having negative optical power;

a third lens having positive optical power;

a fourth lens having negative optical power;

a sixth lens having negative optical power;

wherein, when balancing high frequency performance, aperture value Fno1 of imaging lens group satisfies: fno1<2.0; an on-axis distance TTL from an object side surface of the first lens to an imaging surface and a half of a diagonal length ImgH of an effective pixel area on the imaging surface satisfy: TTL/ImgH <1.2;

the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the imaging lens group satisfy: -3.5 < R3/f < -1.5; the curvature radius R12 of the image side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy: r12/f6 is more than 1.0 and less than 2.0.

13. The imaging lens set of claim 12, wherein the aperture value Fno2 of the imaging lens set at balancing low frequency performance satisfies: fno2>2.2; the maximum field angle FOV of the imaging lens group satisfies: 80 degrees < FOV < 90 degrees.

14. The imaging lens set of claim 12, wherein an effective focal length f3 of said third lens and an effective focal length f of said imaging lens set satisfy: f3/f is more than 10.0 and less than 17.0.

15. The imaging lens set of claim 12 wherein an effective focal length f2 of said second lens and an effective focal length f3 of said third lens satisfy: -6.0 < f3/f2 < -3.0.

16. The imaging lens set of claim 12 wherein the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -4.0 < f4/f5 < -3.0.

17. The imaging lens set of claim 12, wherein a radius of curvature R5 of an object side of the third lens and an effective focal length f of the imaging lens set satisfy: r5/f is more than 2.5 and less than 7.0.

18. The imaging lens set of claim 12 wherein a center thickness CT2 of said second lens on the optical axis and an air gap T23 of said second lens and said third lens on said optical axis satisfy: T23/CT2 is more than 1.0 and less than 3.0.

19. The imaging lens set of claim 12 wherein an on-axis distance SAG32 between an intersection of an image side of the third lens and an optical axis to an effective radius vertex of the image side of the third lens and an on-axis distance SAG61 between an intersection of an object side of the sixth lens and the optical axis to an effective radius vertex of the object side of the sixth lens: 4.0 < SAG61/SAG32 < 5.5.

20. The imaging lens set of claim 12 wherein an on-axis distance SAG41 between an intersection of an object side of the fourth lens and an optical axis to an effective radius vertex of the object side of the fourth lens and an on-axis distance SAG62 between an intersection of an image side of the sixth lens and the optical axis to an effective radius vertex of the image side of the sixth lens: 2.0 < SAG62/SAG41 < 3.0.

21. The imaging lens set of claim 12, wherein a combined focal length f23 of the second lens and the third lens and an effective focal length f of the imaging lens set satisfy: -4.5 < f23/f < -3.5.