CN114647063A

CN114647063A - Imaging lens group

Info

Publication number: CN114647063A
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: 2022-06-21
Anticipated expiration: 2042-03-29
Also published as: CN114647063B

Abstract

The invention provides an imaging lens group. The imaging lens group comprises six lenses from an object side to an image side in sequence: a first lens having a positive optical power; a second lens with negative focal power, wherein the object side surface of the second lens is a concave surface; a third lens having a positive optical power; a fourth lens having a negative optical power; the fifth lens has positive focal power, 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 a negative optical power; wherein, when balancing high frequency performance, the aperture value Fno1 of formation of image lens group satisfies: fno1< 2.0; when the low-frequency performance is balanced, 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 ultrathin property 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 the popularization of smart phones and the vigorous development of the mobile phone industry, various demands of the public on mobile phones are continuously promoted, and the photographing function of the mobile phones becomes an important factor for people to choose the mobile phones, so that mobile phone manufacturers put forward more new demands on imaging lens sets on the mobile phones. The imaging lens group on the current mobile phone has the development trend of large image plane, large aperture and ultrathin, the difficulty of optical design is greatly increased, and the lens characteristics are realized by combining image algorithm and other modes.

Compared with the imaging lens group of a common mobile phone, the imaging capability of the imaging lens group of the mobile phone is improved and the competitive advantage in the industry is increased due to the design parameter requirements. The large image plane can improve the resolution of the system; the large aperture can increase the light inlet quantity so as to improve the night scene shooting capability of the imaging lens group; the ultra-thin characteristic can make camera lens and organism realize better integration, does benefit to frivolous miniaturization. Based on the above requirements of mobile phone suppliers, the traditional design method is not enough to effectively meet the challenges, and needs to be implemented by combining new design ideas.

That is to say, the imaging lens group in the prior art has the problem that large image plane, large aperture and ultra-thinness are difficult to realize simultaneously.

Disclosure of Invention

The invention mainly aims to provide an imaging lens group to solve the problem that the imaging lens group in the prior art has the defects of large image plane, large aperture and ultrathin property and is difficult to realize simultaneously.

In order to achieve the above object, according to an aspect of the present invention, there is provided an imaging lens assembly, comprising, in order from an object side to an image side, six lenses: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having a positive optical power; a fourth lens having a negative optical power; the fifth lens has positive focal power, 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 a negative optical power; wherein, when balancing high frequency performance, the aperture value Fno1 of formation of image lens group satisfies: fno1< 2.0; when the low-frequency performance is balanced, 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 to the imaging plane and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: TTL/ImgH < 1.2.

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

Further, the radius of curvature R3 of the object-side surface of the second lens meets the following requirement between the effective focal length f of the imaging lens group: -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 group 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 the following condition: -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 the following condition: -4.0 < f4/f5 < -3.0.

Further, 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: 2.5 < R5/f < 7.0.

Further, the radius of curvature 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 central 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 to 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 to 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 to 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 to 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 group satisfy: -4.5 < f23/f < -3.5.

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

Further, when balancing the 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 < FOV < 90.

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

Further, the radius of curvature R5 of the object-side surface of the third lens meets the following requirement between the effective focal length f of the imaging lens group: 2.5 < R5/f < 7.0.

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 a positive power, a second lens having a negative power, a third lens having a positive power, a fourth lens having a negative power, a fifth lens having a positive power, and a sixth lens having a negative power; 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; wherein, when balancing high frequency performance, the aperture value Fno1 of formation of image lens group satisfies: fno1< 2.0; when the low-frequency performance is balanced, the aperture value Fno2 of the imaging lens group satisfies: fno2> 2.2.

The focal power of each lens is reasonably restrained, so that the stable transition of light rays is facilitated, and the final imaging quality is ensured. When the high-frequency performance is balanced through control, the aperture value Fno1 of the imaging lens group is below 2.0, so that a larger light incoming amount is obtained, the illumination of an imaging surface and the response of a chip are improved, and the power consumption of the system is reduced. When the low-frequency performance is balanced by controlling, the aperture value Fno2 of the imaging lens group is above 2.2, so as to reduce the low-frequency performance properly, and to reduce the difference between the high-frequency performance and the low-frequency performance. The application provides a six formula imaging lens group of big image plane, big light ring, ultra-thin, the optimization mode that utilizes two light rings can effectual close high low frequency performance, satisfies the application demand of main camera on algorithm demand and the high-end smart mobile phone.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of an imaging lens assembly according to a first embodiment of the present invention;

FIGS. 2 to 5 show an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the imaging lens assembly of FIG. 1;

FIG. 6 is a schematic view of an imaging lens assembly according to example two of the present invention;

FIGS. 7 to 10 show axial chromatic aberration, astigmatism, distortion and magnification chromatic aberration curves of the imaging lens assembly of FIG. 6, respectively;

FIG. 11 is a schematic structural view of a third imaging lens set according to an example of the present invention;

fig. 12 to 15 respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a chromatic aberration of magnification curve of the imaging lens set in fig. 11;

FIG. 16 is a schematic view of an imaging lens assembly of example four of the present invention;

FIGS. 17 to 20 show axial chromatic aberration, astigmatism, distortion and magnification chromatic aberration curves, respectively, of the imaging lens assembly of FIG. 16;

FIG. 21 is a schematic view of an imaging lens assembly of example five of the present invention;

fig. 22 to 25 respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a chromatic aberration of magnification curve of the imaging lens set in fig. 21;

FIG. 26 is a schematic view of an imaging lens set according to example six of the present invention;

FIGS. 27 to 30 show axial chromatic aberration, astigmatism, distortion and magnification chromatic aberration curves, respectively, of the imaging lens assembly of FIG. 26;

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

Wherein the figures include the following reference numerals:

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

s11, the object side surface of the sixth lens; s12, the image side surface of the sixth lens; e7, optical filters; s13, the object side surface of the optical filter; s14, the image side surface of the optical filter; and S15, imaging surface.

Detailed Description

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 invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, 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.

In the present invention, unless stated to the contrary, the use of directional terms such as "upper, lower, top, bottom" or the like, generally refers to the orientation of the components as shown in the drawings, or to the vertical, perpendicular, or gravitational orientation of the components themselves; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

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, 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 the 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 close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be performed by determining whether the surface shape is concave or convex based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in the lens database (lens data) in the optical software) according to the determination method of a person ordinarily skilled in the art. For 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 case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The invention provides an imaging lens group, aiming at solving the problem that the imaging lens group in the prior art has the defects of large image plane, large aperture and ultrathin property and is difficult to realize simultaneously.

Example one

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

The focal power of each lens is reasonably restrained, so that the stable transition of light rays is facilitated, and the final imaging quality is ensured. When the high-frequency performance is balanced through control, the aperture value Fno1 of the imaging lens group is below 2.0, so that a larger light incoming amount is obtained, the illumination of an imaging surface and the response of a chip are improved, and the power consumption of the system is reduced. When the low-frequency performance is balanced by controlling, the aperture value Fno2 of the imaging lens group is above 2.2, so as to reduce the low-frequency performance properly, and to reduce the difference between the high-frequency performance and the low-frequency performance. The application provides for a six formula imaging lens group of big image planes, big light ring, ultra-thinization, the optimization mode that utilizes two light rings can effectual close high-low frequency performance, satisfies the application demand of main camera on algorithm demand and the high-end smart mobile phone.

In this embodiment, the on-axis distance TTL from the object-side surface of the first lens element to the imaging surface and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: TTL/ImgH < 1.2. The ratio of the on-axis distance TTL from the object side surface of the first lens to the imaging surface to the half of the diagonal length ImgH of the effective pixel area on the imaging surface is in a reasonable range, the total system length of the imaging lens group is reduced as far as possible while the large image surface is ensured, and the imaging lens group is ensured to achieve the ultrathin effect.

In the present embodiment, the maximum field angle FOV of the imaging lens group satisfies: 80 < FOV < 90. The maximum field angle FOV of the imaging lens group is reasonably restricted, so that a larger field range is favorably 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 element and the effective focal length f of the imaging lens assembly satisfy: -3.5 < R3/f < -1.5. The optical power of the system can be reasonably distributed, and the astigmatism generated by the front-end optical lens and the rear-end optical lens of the system is balanced, so that the system has good imaging quality. Preferably, -3.3 < R3/f < -1.9.

In the embodiment, the effective focal length f3 of the third lens element and the effective focal length f of the imaging lens assembly satisfy: f3/f is more than 10.0 and less than 17.0. The condition is satisfied, the residual spherical aberration generated by the lens behind the optical system can be balanced, the axial aberration is small, and good imaging quality can be obtained. Preferably, 10.0 < f3/f < 16.8.

In the present 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 restricted by satisfying the conditional expression, so that the field curvature contributions of the two lenses are 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 condition is satisfied, the deflection angle of light can be reduced, and the imaging quality of the imaging lens group is improved. Preferably, -3.8 < f4/f5 < -3.1.

In the 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 assembly satisfy: 2.5 < R5/f < 7.0. The imaging lens group can effectively control the astigmatism of the imaging lens group and further improve the imaging quality of an off-axis field of view. Preferably, 2.8 < R5/f < 6.8.

In the present embodiment, the radius of curvature 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. Satisfy this conditional expression, can control third-order coma in reasonable within range, and then can balance the coma amount that front end optical lens produced for the formation of image lens group has good imaging quality. Preferably, 1.4 < R12/f6 < 1.6.

In the present embodiment, the central thickness CT2 of the second lens on the optical axis and the air space 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. Satisfy this conditional expression, the position that can effectual restriction second lens is favorable to realizing the compactedness of formation of image lens group structure, is favorable to correcting off-axis aberration simultaneously, promotes the whole image quality of formation of image lens group. Preferably, 1.1 < T23/CT2 < 2.8.

In this 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 condition is satisfied, the sensitivity of the third lens and the sensitivity of the sixth lens are reduced, and the lens is convenient to machine and form. Preferably, 4.1 < SAG61/SAG32 < 5.2.

In this embodiment, an on-axis distance SAG41 between an intersection point of the object-side surface of the fourth lens and the optical axis to 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 to an effective radius vertex of the image-side surface of the sixth lens satisfy: 2.0 < SAG62/SAG41 < 3.0. The condition is satisfied, 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 embodiment, the combined focal length f23 of the second lens element and the third lens element and the effective focal length f of the imaging lens assembly satisfy: -4.5 < f23/f < -3.5. The conditional expression is satisfied, the contribution range of the focal power can be reasonably controlled, and meanwhile, the contribution rate of the spherical aberration of the lens can be reasonably controlled, so that the focal power of the lens can be reasonably balanced. Preferably, -4.5 < f23/f < -3.6.

Example two

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

The focal power of each lens is reasonably restrained, so that the stable transition of light rays is facilitated, and the final imaging quality is ensured. When the high-frequency performance is balanced through control, the aperture value Fno1 of the imaging lens group is below 2.0, so that a larger light incoming amount is obtained, the illumination of an imaging surface and the response of a chip are improved, and the power consumption of the system is reduced. The ratio of the on-axis distance TTL from the object side surface of the first lens to the imaging surface to the half of the diagonal length ImgH of the effective pixel area on the imaging surface is in a reasonable range, the total system length of the imaging lens group is reduced as far as possible while the large image surface is ensured, and the imaging lens group is ensured to achieve the ultrathin effect. The application provides a six formula imaging lens group of big image plane, big light ring, ultra-thin, the optimization mode that utilizes two light rings can effectual close high low frequency performance, satisfies the application demand of main camera on algorithm demand and the high-end smart mobile phone.

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

In the present 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 restricted, so that a larger field range is favorably obtained, and the capability of capturing object space information by the imaging lens group can be improved. Preferably, 89 < FOV < 90.

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

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

The imaging lens assembly in the present application may employ a plurality of lenses, such as the six lenses described above. Through the reasonable distribution of focal power, surface shape, center thickness of each lens, on-axis distance between each lens and the like, the imaging lens group is more favorable for production and processing and is applicable to portable electronic equipment such as smart phones. The imaging lens group also has the advantages of ultra-thinness and good imaging quality, and can meet the requirement of miniaturization of intelligent electronic products.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens has the characteristics 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 lens center to the lens periphery, an aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens set can be varied to achieve the various results and advantages described herein without departing from the claimed technology. For example, although six lenses are exemplified in the embodiment, the imaging lens group is not limited to include six lenses. The imaging lens assembly can also include other numbers of lenses, if desired.

Examples of specific surface types and parameters of the imaging lens group applicable to the above embodiments are further described below with reference to the drawings.

It should be noted that any one 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 set according to a first example of the present application is described. Fig. 1 is a schematic diagram illustrating the structure of an imaging lens set of the first example.

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

The first lens E1 has positive power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The second lens E2 has negative power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The third lens E3 has positive power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The fourth lens E4 has negative power, and the object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The fifth lens E5 has positive power, the object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The sixth lens E6 has negative power, and the object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex. The filter E7 has a filter object-side surface S13 and a filter image-side surface S14. The light from the object passes through the respective surfaces S1 to S14 in order 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 ° and the total length TTL of the imaging lens group is 5.87mm and the image height ImgH is 5.27 mm.

Table 1 shows a table of basic structural parameters for the imaging lens set of example one, wherein the radius of curvature and thickness/distance are 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 through the sixth lens E6 are aspheric surfaces, and the surface shape 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 gives the high-order coefficient 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.

Flour mark

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

Flour mark

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 axial chromatic aberration curve of the imaging lens assembly of example one, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens assembly. FIG. 3 shows an astigmatism curve representing meridional and sagittal field curvatures for the imaging lens assembly of example one. Fig. 4 shows distortion curves of the imaging lens assembly of example one, which show values of distortion magnitudes corresponding to different angles of view. Fig. 5 shows a chromatic aberration of magnification curve of the imaging lens assembly of the first example, which shows the deviation of different image heights of the light passing through the imaging lens assembly.

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

Example two

As shown in fig. 6 to 10, an imaging lens assembly of the second embodiment of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. FIG. 6 is a schematic diagram of the imaging lens assembly of example two.

As shown in fig. 6, the imaging lens assembly, in order from an object side to an image side, comprises: a stop STO, a first mirror E1, a second mirror E2, a third mirror E3, a fourth mirror E4, a fifth mirror E5, a sixth mirror E6, a filter E7, and an image plane 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 ° and the total length TTL of the imaging lens group is 5.87mm and the image height ImgH is 5.27 mm.

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

TABLE 3

Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

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

Flour mark

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

Fig. 7 shows an on-axis aberration curve of the imaging lens group of example two, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens group. FIG. 8 shows the astigmatism curves for the imaging lens assembly of example two, representing meridional and sagittal curvature of field. Fig. 9 shows distortion curves of the imaging lens assembly of example two, which show values of distortion magnitudes for different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the imaging lens assembly of the second example, which shows the deviation of different image heights of light passing through the imaging lens assembly on the image plane.

As can be seen from fig. 7 to 10, the imaging lens assembly of example two can achieve good imaging quality.

EXAMPLE III

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

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

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

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

TABLE 5

Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 6

Fig. 12 shows on-axis chromatic aberration curves of the imaging lens group of example three, which represent the deviation of the convergent focus of light rays of different wavelengths through the imaging lens group. FIG. 13 is an astigmatism curve representing meridional field curvature and sagittal field curvature for the imaging lens group of example three. Fig. 14 shows distortion curves of the imaging lens group of example three, which show values of distortion magnitudes for different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the imaging lens group of example three, which shows the deviation of different image heights of the light passing through the imaging lens group on the imaging plane.

As can be seen from fig. 12 to 15, the imaging lens assembly of the third example can achieve good imaging quality.

Example four

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

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

The first lens E1 has positive power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The second lens E2 has negative power, and the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The third lens E3 has positive power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The fourth lens E4 has negative power, and the object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The fifth lens E5 has positive power, the object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The sixth lens E6 has negative power, and the object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex. The filter E7 has a filter object-side surface S13 and a filter image-side surface S14. 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 table of basic structural parameters for the imaging lens set of example four, wherein the radius of curvature and thickness/distance are in millimeters (mm).

TABLE 7

Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 8

Fig. 17 shows an on-axis aberration curve of the imaging lens group of example four, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens group. FIG. 18 shows the astigmatism curves for the imaging lens group of example four, representing meridional and sagittal field curvatures. Fig. 19 shows distortion curves of the imaging lens group of example four, which show values of distortion magnitudes for different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the imaging lens group of example four, which shows the deviation of different image heights of light passing through the imaging lens group on the imaging plane.

As can be seen from fig. 17 to 20, the imaging lens assembly of example four can achieve good imaging quality.

Example five

As shown in fig. 21 to 25, an imaging lens set of example five of the present application is described. FIG. 21 is a schematic view of the imaging lens assembly of example five.

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

The first lens E1 has positive power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The second lens E2 has negative power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The third lens E3 has positive power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The fourth lens E4 has negative power, and the object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The fifth lens E5 has positive power, the object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The sixth lens E6 has negative power, and the object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex. The filter E7 has a filter object side surface S13 and a filter image side surface S14. The light from the object passes through the respective surfaces S1 to S14 in order 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 44.9 ° and the total length TTL of the imaging lens group is 5.87mm and the image height ImgH is 5.27 mm.

Table 9 sets forth a table of basic structural parameters for the imaging lens set of example five wherein the radii of curvature and thickness/distance are in millimeters (mm).

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Watch 10

Fig. 22 shows an on-axis aberration curve for the imaging lens group of example five, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging lens group. FIG. 23 shows the astigmatism curves for the imaging lens group of example five, representing meridional and sagittal image planes curvature. Fig. 24 shows distortion curves for the imaging lens assembly of example five, which show values of distortion magnitude for different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the imaging lens assembly of example five, which shows the deviation of different image heights of light rays passing through the imaging lens assembly on the imaging plane.

As can be seen from fig. 22 to 25, the imaging lens assembly of example five can achieve good imaging quality.

Example six

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

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

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

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

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

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

Flour mark

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 on-axis chromatic aberration curves of the imaging lens group of example six, which represent the deviation of the converging focuses of light rays of different wavelengths after passing through the imaging lens group. FIG. 28 shows the astigmatism curves for the imaging lens group of example six, representing meridional and sagittal field curvatures. Fig. 29 shows distortion curves of the imaging lens group of example six, which show values of distortion magnitudes for different angles of view. Fig. 30 shows a chromatic aberration of magnification curve of the imaging lens group of example six, which shows the deviation of different image heights of light rays on the imaging plane after passing through the imaging lens group.

As can be seen from fig. 27 to 30, the imaging lens assembly of example six can achieve good imaging quality.

To sum up, examples one to six satisfy the relationships shown in table 13, respectively.

Conditional formula/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 sets of examples one to six, and the effective focal lengths f1 to f6 of the respective lenses.

Parameter/example	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 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 imaging lens set described above.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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 example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of 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 claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An imaging lens assembly, comprising, in order from an object side to an image side:

a first lens having a positive optical power;

a second lens having a negative optical power;

a third lens having a positive optical power;

a fourth lens having a negative optical power;

the lens comprises 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 a negative optical power;

when the high-frequency performance is balanced, the aperture value Fno1 of the imaging lens group satisfies the following conditions: fno1< 2.0; when the low-frequency performance is balanced, the aperture value Fno2 of the imaging lens group satisfies: fno2> 2.2.

2. The imaging lens assembly of claim 1, wherein an on-axis distance TTL from an object side surface to an imaging surface of the first lens element to a half ImgH of a diagonal length of an effective pixel area on the imaging surface satisfies: TTL/ImgH < 1.2.

3. The set of imaging lenses of claim 1, wherein the maximum field angle FOV of the set of imaging lenses satisfies: 80 < FOV < 90.

4. The imaging lens group of claim 1, wherein a radius of curvature R3 of an object side surface of said second lens element and an effective focal length f of said imaging lens group satisfy: -3.5 < R3/f < -1.5.

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

6. The set of imaging lenses 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.

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

8. The set of imaging lenses of claim 1, wherein a radius of curvature R5 of an object-side surface of the third lens element and an effective focal length f of the set of imaging lenses satisfy: 2.5 < R5/f < 7.0.

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

10. An imaging lens assembly, comprising, in order from an object side to an image side:

a first lens having a positive optical power;

a second lens having a negative optical power;

a third lens having a positive optical power;

a fourth lens having a negative optical power;

a sixth lens having a negative optical power;

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