CN216792549U

CN216792549U - Optical imaging lens group

Info

Publication number: CN216792549U
Application number: CN202122759006.5U
Authority: CN
Inventors: 吕赛锋; 何旦; 姚嘉诚; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-06-21
Anticipated expiration: 2031-11-11

Abstract

The utility model provides an optical imaging lens group. The optical imaging lens group sequentially comprises from an object side to an image side along an optical axis: the surface of the first lens facing to the object side is a concave surface, and the surface of the first lens facing to the image side is a convex surface; a second lens; a third lens; the surface of the fourth lens, which faces the object side, is a convex surface, and the surface of the fourth lens, which faces the image side, is a concave surface; a fifth lens; a sixth lens; a seventh lens; an eighth lens; the effective focal length f of the optical imaging lens group, the entrance pupil diameter EPD of the optical imaging lens group and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy the following conditions: f/EPD + ImgH/f < 2.5. The utility model solves the problem that the optical imaging lens group in the prior art has large image plane, ultra-large aperture and miniaturization which are difficult to realize simultaneously.

Description

Optical imaging lens group

Technical Field

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

Background

At present, smart phones are developed more and more mature, functions of the smart phones are enriched day by day, people tend to adopt the tendency that the photographing function of the smart phones replaces a traditional camera gradually due to the portability of the smart phones, and people also prefer high imaging quality and various photographing functions of photographing of the smart phones more and more. Along with the continuous improvement of each terminal to the quality of making a video recording, the optics that matches with electronic sensitization chip formation of image lens group is also constantly upgrading. Most mobile phone manufacturers have made higher demands on various shooting performances of the optical imaging lens group. The optical imaging lens group has the advantages that the optical imaging lens group can achieve the characteristic of large aperture, but the overall size of the optical imaging lens group is large, and the requirement for miniaturization is difficult to meet.

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

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an optical imaging lens group to solve the problem that the optical imaging lens group in the prior art has large image plane, ultra-large aperture and miniaturization which are difficult to realize simultaneously.

In order to achieve the above object, according to an aspect of the present invention, there is provided an optical imaging lens assembly, comprising, in order from an object side to an image side along an optical axis: the first lens, the surface facing to the object side is a concave surface, and the surface facing to the image side is a convex surface; a second lens; a third lens; the surface of the fourth lens, which faces the object side, is a convex surface, and the surface of the fourth lens, which faces the image side, is a concave surface; a fifth lens; a sixth lens; a seventh lens; an eighth lens; the effective focal length f of the optical imaging lens group, the entrance pupil diameter EPD of the optical imaging lens group and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy the following conditions: f/EPD + ImgH/f < 2.5.

Further, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0< f6/f5< -0.5.

Further, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 0< f7/(f7-f8) < 1.0.

Further, the combined focal length f123 of the first, second and third lenses and the combined focal length f567 of the fifth, sixth and seventh lenses satisfy: 0.3< f123/f567< 1.3.

Further, the maximum effective radius DT12 of the surface facing the image side of the first lens and the maximum effective radius DT21 of the surface facing the object side of the second lens satisfy: 0.5< DT21/DT12< 1.0.

Further, the maximum effective radius DT41 of the surface of the fourth lens facing the object side, the maximum effective radius DT42 of the surface of the fourth lens facing the image side and the effective focal length f4 of the fourth lens satisfy the following conditions: -0.7< (DT41+ DT42)/f4< -0.2.

Further, an on-axis distance SAG21 between an intersection point of the surface of the second lens facing the object side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, an on-axis distance SAG22 between an intersection point of the surface of the second lens facing the image side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, and a central thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG21-SAG22)/CT2< 0.8.

Further, an on-axis distance SAG41 between an intersection point of an object-side-facing surface of the fourth lens and the optical axis to an effective radius vertex of the object-side-facing surface of the fourth lens and an on-axis distance SAG42 between an intersection point of an image-side-facing surface of the fourth lens and the optical axis to an effective radius vertex of the object-side-facing surface of the fourth lens satisfy: 0.2< SAG41/SAG42< 0.7.

Further, an on-axis distance SAG71 between an intersection point of a surface of the seventh lens facing the object side and the optical axis to an effective radius vertex of the surface of the seventh lens facing the object side, an on-axis distance SAG72 between an intersection point of the surface of the seventh lens facing the image side and the optical axis to an effective radius vertex of the surface of the seventh lens facing the object side, and a central thickness CT7 of the seventh lens on the optical axis satisfy: -1.0< CT7/(SAG71+ SAG72) < -0.2.

Further, the radius of curvature R1 of the surface of the first lens facing the object side, the radius of curvature R2 of the surface of the first lens facing the image side, and the radius of curvature R3 of the surface of the second lens facing the object side satisfy: -1.5< R3/(R1+ R2) <0.

Further, a curvature radius R7 of a surface of the fourth lens facing the object side and a curvature radius R8 of a surface of the fourth lens facing the image side satisfy: 0< (R7-R8)/(R7+ R8) < 1.0.

Further, a curvature radius R10 of a surface of the fifth lens facing the image side and a curvature radius R16 of a surface of the eighth lens facing the image side satisfy: 0< R10/(R10-R16) < 1.0.

Further, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis and the sum Σ AT of the air intervals on the optical axis between two adjacent lenses in the first to eighth lenses satisfy: 0.5< (CT3+ CT4+ CT5)/Σ AT < 1.5.

Further, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis satisfy: 0.5< CT6/CT8< 1.5.

Furthermore, the first lens has positive focal power, and the surface of the third lens facing the image side is a convex surface.

Further, the fourth lens has a negative power, and the fifth lens has a positive power.

The seventh lens has positive power, the surface of the seventh lens facing the object side is a convex surface, the eighth lens has negative power, and the surface of the eighth lens facing the image side is a concave surface.

According to another aspect of the present invention, an optical imaging lens assembly includes, in order from an object side to an image side along an optical axis: the first lens is provided with a concave surface facing the object side and a convex surface facing the image side; a second lens; a third lens; the surface of the fourth lens, which faces the object side, is a convex surface, and the surface of the fourth lens, which faces the image side, is a concave surface; a fifth lens; a sixth lens; a seventh lens; an eighth lens; wherein an on-axis distance SAG21 between an intersection point of a surface of the second lens facing the object side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, an on-axis distance SAG22 between an intersection point of the surface of the second lens facing the image side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, and a central thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG21-SAG22)/CT2< 0.8.

Further, the effective focal length f of the optical imaging lens group, the entrance pupil diameter EPD of the optical imaging lens group and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: f/EPD + ImgH/f < 2.5; the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy the following condition: -2.0< f6/f5< -0.5.

Further, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following condition: 0< f7/(f7-f8) < 1.0; the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy the following conditions: 0.3< f123/f567< 1.3.

Further, the curvature radius R7 of the surface facing the object side of the fourth lens and the curvature radius R8 of the surface facing the image side of the fourth lens satisfy: 0< (R7-R8)/(R7+ R8) < 1.0.

Further, a center thickness CT3 of the third lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, and a sum Σ AT of air spaces on the optical axis between adjacent two lenses of the first lens to the eighth lens satisfy: 0.5< (CT3+ CT4+ CT5)/Σ AT < 1.5.

Furthermore, the seventh lens has positive focal power, the surface of the seventh lens facing the object side is a convex surface, the eighth lens has negative focal power, and the surface of the eighth lens facing the image side is a concave surface.

By applying the technical scheme of the utility model, the optical imaging lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from an object side to an image side along an optical axis; the surface of the first lens facing the object side is a concave surface, and the surface of the first lens facing the image side is a convex surface; the surface of the fourth lens facing the object side is a convex surface, and the surface of the fourth lens facing the image side is a concave surface; the effective focal length f of the optical imaging lens group, the entrance pupil diameter EPD of the optical imaging lens group and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy the following conditions: f/EPD + ImgH/f < 2.5.

Through the effective focal length f of restraint optics formation of image lens group, the incidence pupil diameter EPD of optics formation of image lens group and the imaging surface on the effective pixel region diagonal length half ImgH between the relational expression at reasonable within range, on the basis of big image plane, reduce incident light's deflection angle, constantly increase optical system's relative aperture, obtain more light flux, so that promote the imaging effect of dark state environment, improve the imaging effect of large aperture system, can guarantee the miniaturization of system simultaneously.

Drawings

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

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

FIGS. 2 to 4 respectively show axial chromatic aberration, astigmatism and distortion curves of the optical imaging lens assembly of FIG. 1;

FIG. 5 is a schematic diagram of an optical imaging lens assembly according to a second embodiment of the present invention;

FIGS. 6 to 8 show axial chromatic aberration, astigmatism and distortion curves of the optical imaging lens assembly of FIG. 5;

FIG. 9 is a schematic diagram of an optical imaging lens assembly according to a third embodiment of the present invention;

FIGS. 10 to 12 show axial chromatic aberration, astigmatism and distortion curves, respectively, of the optical imaging lens assembly of FIG. 9;

FIG. 13 is a schematic view of an optical imaging lens assembly according to example four of the present invention;

FIGS. 14 to 16 respectively show axial chromatic aberration, astigmatism and distortion curves of the optical imaging lens assembly of FIG. 13;

FIG. 17 is a schematic diagram of an optical imaging lens assembly according to example five of the present invention;

FIGS. 18 to 20 show axial chromatic aberration, astigmatism and distortion curves, respectively, of the optical imaging lens assembly of FIG. 17;

FIG. 21 is a schematic diagram of an optical imaging lens assembly according to a sixth embodiment of the present invention;

FIGS. 22-24 respectively illustrate axial chromatic aberration, astigmatism and distortion curves of the optical imaging lens assembly of FIG. 21;

FIG. 25 is a schematic diagram of an optical imaging lens assembly according to a seventh embodiment of the present invention;

fig. 26 to 28 show axial chromatic aberration curves, astigmatism curves and distortion curves of the optical imaging lens assembly of fig. 25, respectively.

Wherein the figures include the following reference numerals:

e1, a first lens; s1, the object-side surface of the first lens; s2, the surface of the first lens facing the image side; e2, a second lens; s3, the object-side surface of the second lens; s4, the surface of the second lens facing the image side; e3, third lens; s5, the object-side surface of the third lens; s6, the surface of the third lens facing the image side; e4, fourth lens; s7, the object-side surface of the fourth lens; s8, the surface of the fourth lens facing the image side; e5, fifth lens; s9, the object-side surface of the fifth lens; s10, the surface of the fifth lens facing the image side; e6, sixth lens; s11, the object-side surface of the sixth lens element; s12, the surface of the sixth lens facing the image side; e7, seventh lens; s13, the object-side surface of the seventh lens; s14, the surface of the seventh lens facing the image side; e8, eighth lens; s15, the object-side surface of the eighth lens; s16, the surface of the eighth lens facing the image side; e9, optical filters; s17, the surface of the filter facing the object side; s18, the surface of the filter facing the image side; and S19, imaging surface.

Detailed Description

It should be noted that, in the present application, the embodiments and features of the embodiments 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 to be 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 specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; 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 utility model.

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 is the surface of the lens facing to the object side, and the surface of each lens close to the image side is called the surface of the lens facing to the image side. The determination of the surface shape in the paraxial region can be made by determining whether or not the surface shape is concave or convex using an R value (R denotes a radius of curvature of the paraxial region, and usually denotes an R value in a lens database (lens data) in optical software) according to a determination method by a person ordinarily skilled in the art. With respect to the surface facing the object side, a convex surface is determined when the R value is positive, and a concave surface is determined when the R value is negative; on the surface facing the image side, a concave surface is determined when the R value is positive, and a convex surface is determined when the R value is negative.

The utility model provides an optical imaging lens group, aiming at solving the problem that the optical imaging lens group in the prior art has large image plane, ultra-large aperture and miniaturization which are difficult to realize simultaneously.

Example one

As shown in fig. 1 to 28, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element; the surface of the first lens facing the object side is a concave surface, and the surface of the first lens facing the image side is a convex surface; the surface of the fourth lens facing the object side is a convex surface, and the surface of the fourth lens facing the image side is a concave surface; the effective focal length f of the optical imaging lens group, the entrance pupil diameter EPD of the optical imaging lens group and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy the following conditions: f/EPD + ImgH/f < 2.5.

Preferably, f/EPD + ImgH/f < 2.1.

Through the effective focal length f of restraint optics formation of image lens group, the incidence pupil diameter EPD of optics formation of image lens group and the imaging surface on the relational expression between the half ImgH of effective pixel region diagonal length at reasonable within range, on the basis of big image plane, reduce incident light's deflection angle, the relative aperture of continuous increase optics formation of image lens group, obtain more light flux, so that promote the imaging effect of dark state environment, improve the imaging effect of large aperture system, can guarantee the miniaturization of system simultaneously.

In the present embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0< f6/f5< -0.5. Through reasonable distribution of the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens, improvement of lateral chromatic aberration of the optical imaging lens group is facilitated. Preferably, -2.0< f6/f5< -0.9.

In the present embodiment, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: 0< f7/(f7-f8) < 1.0. Through the reasonable distribution of the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens, the close-range imaging effect is favorably improved. Preferably, 0.1< f7/(f7-f8) < 0.7.

In the present embodiment, the combined focal length f123 of the first, second and third lenses and the combined focal length f567 of the fifth, sixth and seventh lenses satisfy: 0.3< f123/f567< 1.3. Satisfying this conditional expression, can reaching and increasing the light flux, reducing because the light deflection angle's that relative aperture increases the condition that arouses, weakening the sensitivity of system, promoting imaging quality's effect. Preferably 0.4< f123/f567< 1.2.

In this embodiment, the maximum effective radius DT12 of the surface facing the image side of the first lens and the maximum effective radius DT21 of the surface facing the object side of the second lens satisfy: 0.5< DT21/DT12< 1.0. The condition is satisfied, the attractiveness of the appearance of the optical imaging lens group is guaranteed, and meanwhile the miniaturization of the optical imaging lens group is controlled. Preferably 0.7< DT21/DT12< 1.0.

In this embodiment, the maximum effective radius DT41 of the surface of the fourth lens facing the object side, the maximum effective radius DT42 of the surface of the fourth lens facing the image side, and the effective focal length f4 of the fourth lens satisfy: -0.7< (DT41+ DT42)/f4< -0.2. The condition is satisfied, the processing of the fourth lens is facilitated, and meanwhile, the assembly stability is guaranteed by association with the front lens and the rear lens. Preferably, -0.6< (DT41+ DT42)/f4< -0.3.

In this embodiment, an on-axis distance SAG21 between an intersection point of a surface of the second lens facing the object side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, an on-axis distance SAG22 between an intersection point of the surface of the second lens facing the image side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, and a central thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG21-SAG22)/CT2< 0.8. The optical lens meets the conditional expression, is beneficial to matching with the first lens in the process of increasing the clear aperture, and further reduces the deflection angle of light, thereby achieving the purposes of reducing sensitivity and collecting light. Preferably, 0.3< (SAG21-SAG22)/CT2< 0.6.

In this embodiment, an on-axis distance SAG41 between an intersection point of a surface of the fourth lens facing the object side and the optical axis and an effective radius vertex of the surface of the fourth lens facing the object side and an on-axis distance SAG42 between an intersection point of the surface of the fourth lens facing the image side and the optical axis and an effective radius vertex of the surface of the fourth lens facing the object side satisfy: 0.2< SAG41/SAG42< 0.7. The condition is satisfied, the processability of the fourth lens is facilitated, and the assembly stability is guaranteed by association with the front lens and the rear lens. Preferably, 0.3< SAG41/SAG42< 0.6.

In this embodiment, an on-axis distance SAG71 between an intersection point of a surface of the seventh lens facing the object side and the optical axis and an effective radius vertex of the surface of the seventh lens facing the object side, an on-axis distance SAG72 between an intersection point of the surface of the seventh lens facing the image side and the optical axis and an effective radius vertex of the surface of the seventh lens facing the object side, and a central thickness CT7 of the seventh lens on the optical axis satisfy: -1.0< CT7/(SAG71+ SAG72) < -0.2. The condition is satisfied, the processing of the seventh lens is facilitated, and the assembly stability is guaranteed by association with the front lens and the rear lens. Preferably, -0.9< CT7/(SAG71+ SAG72) < -0.3.

In this embodiment, the radius of curvature R1 of the surface of the first lens facing the object side, the radius of curvature R2 of the surface of the first lens facing the image side, and the radius of curvature R3 of the surface of the second lens facing the object side satisfy: -1.5< R3/(R1+ R2) <0. The conditional expression is satisfied, the process of increasing the clear aperture is facilitated, the deflection angle of the light is further reduced, and therefore the purposes of reducing the sensitivity and receiving the light are achieved. Preferably, -1.1< R3/(R1+ R2) < -0.4.

In this embodiment, a radius of curvature R7 of a surface of the fourth lens facing the object side and a radius of curvature R8 of a surface of the fourth lens facing the image side satisfy: 0< (R7-R8)/(R7+ R8) < 1.0. The fourth lens mainly plays a role in improving imaging quality in the system, the processing of the fourth lens is facilitated by controlling the curvature radius of the fourth lens, and meanwhile, the assembly stability is guaranteed by association with the front lens and the rear lens. Preferably, 0.1< (R7-R8)/(R7+ R8) < 0.4.

In this embodiment, a radius of curvature R10 of the image-side surface of the fifth lens and a radius of curvature R16 of the image-side surface of the eighth lens satisfy: 0.1< R10/(R10-R16) < 0.4. The conditional expression is satisfied, the light transition is facilitated, the deflection angle is reduced, and the imaging effect of a close scene is improved. Preferably, 0.4< R10/(R10-R16) < 0.9.

In the present embodiment, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the sum Σ AT of the air intervals on the optical axis between two adjacent lenses in the first to eighth lenses satisfy: 0.5< (CT3+ CT4+ CT5)/Σ AT < 1.5. The condition is satisfied, the thickness of the lens and the air gap are reasonably distributed, and the processing and assembling characteristics of the system are ensured. Preferably, 0.8< (CT3+ CT4+ CT5)/Σ AT < 1.4.

In the present embodiment, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis satisfy: 0.5< CT6/CT8< 1.5. The condition is satisfied, and the processing characteristics of the lens are improved on the basis of improving close-range imaging. Preferably 0.5< CT6/CT8< 1.3.

In this embodiment, the first lens has positive power, and the surface of the third lens facing the image side is a convex surface. The light beam deflection angle is slowed down and the sensitivity is reduced on the basis of increasing the clear aperture.

In this embodiment, the fourth lens has a negative power, and the fifth lens has a positive power. Therefore, under the condition of large aperture, the light deflection is improved, the aberration is reduced, and the imaging quality is improved.

In this embodiment, the seventh lens has positive power, a surface of the seventh lens facing the object side is a convex surface, the eighth lens has negative power, and a surface of the eighth lens facing the image side is a concave surface. This arrangement is advantageous for improving the imaging quality of the close range.

Example two

As shown in fig. 1 to 28, the optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element; the surface of the first lens facing the object side is a concave surface, and the surface of the first lens facing the image side is a convex surface; the surface of the fourth lens facing the object side is a convex surface, and the surface of the fourth lens facing the image side is a concave surface; wherein an on-axis distance SAG21 between an intersection point of a surface of the second lens facing the object side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, an on-axis distance SAG22 between an intersection point of the surface of the second lens facing the image side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, and a central thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG21-SAG22)/CT2< 0.8.

Preferably, 0.3< (SAG21-SAG22)/CT2< 0.6.

This application reduces incident light's deflection angle on the basis of big image planes, and the relative aperture of constantly increased optical imaging lens group obtains more light flux to promote the formation of image effect of dark state environment, improve the formation of image effect of large aperture system, can guarantee the miniaturization of system simultaneously. The conditional expression of the axial distance SAG21 between the intersection point of the surface facing the object side of the second lens and the optical axis and the effective radius vertex of the surface facing the object side of the second lens, and the axial distance SAG22 between the intersection point of the surface facing the image side of the second lens and the optical axis and the effective radius vertex of the surface facing the object side of the second lens and the central thickness CT2 of the second lens on the optical axis is in a reasonable range, so that the optical lens is beneficial to being matched with the first lens in the process of increasing the clear aperture, the deflection angle of light rays is further reduced, and the purposes of reducing sensitivity and collecting light are achieved.

In this embodiment, the effective focal length f of the optical imaging lens group, the entrance pupil diameter EPD of the optical imaging lens group, and the half ImgH of the diagonal length of the effective pixel area on the imaging plane satisfy: f/EPD + ImgH/f < 2.5. Through the effective focal length f of restraint optics formation of image lens group, the incidence pupil diameter EPD of optics formation of image lens group and the imaging surface on the relational expression between the half ImgH of effective pixel region diagonal length at reasonable within range, on the basis of big image plane, reduce incident light's deflection angle, the relative aperture of continuous increase optics formation of image lens group, obtain more light flux, so that promote the imaging effect of dark state environment, improve the imaging effect of large aperture system, can guarantee the miniaturization of system simultaneously. Preferably, f/EPD + ImgH/f < 2.1.

In the present embodiment, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0< f6/f5< -0.5. Through the reasonable distribution of the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens, the improvement of the lateral chromatic aberration of the optical imaging lens group is facilitated. Preferably, -2.0< f6/f5< -0.9.

In this embodiment, the maximum effective radius DT12 of the surface facing the image side of the first lens and the maximum effective radius DT21 of the surface facing the object side of the second lens satisfy: 0.5< DT21/DT12< 1.0. The condition is satisfied, the attractiveness of the appearance of the optical imaging lens group is guaranteed, and meanwhile the miniaturization of the optical imaging lens group is controlled. Preferably, 0.7< DT21/DT12< 1.0.

In this embodiment, the maximum effective radius DT41 of the surface of the fourth lens facing the object side, the maximum effective radius DT42 of the surface of the fourth lens facing the image side, and the effective focal length f4 of the fourth lens satisfy: -0.7< (DT41+ DT42)/f4< -0.2. The condition is satisfied, the processing of the fourth lens is facilitated, and the assembly stability is guaranteed by association with the front lens and the rear lens. Preferably, -0.6< (DT41+ DT42)/f4< -0.3.

In this embodiment, a radius of curvature R10 of the image-side surface of the fifth lens and a radius of curvature R16 of the image-side surface of the eighth lens satisfy: 0< R10/(R10-R16) < 1.0. The condition is satisfied, the light transition is facilitated, the deflection angle is reduced, and the close-range imaging effect is improved. Preferably, 0.4< R10/(R10-R16) < 0.9.

In the present embodiment, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the sum Σ AT of the air intervals on the optical axis between two adjacent lenses in the first to eighth lenses satisfy: 0.5< (CT3+ CT4+ CT5)/Σ AT < 1.5. The condition is satisfied, the reasonable distribution of the thickness of the lens and the air gap is facilitated, and the processing and assembling characteristics of the system are ensured. Preferably, 0.8< (CT3+ CT4+ CT5)/Σ AT < 1.4.

Optionally, the optical 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 optical imaging lens assembly in the present application may employ a plurality of lenses, such as the eight lenses described above. The aperture of the optical imaging lens group can be effectively increased, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved by reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, so that the optical imaging lens group is more beneficial to production and processing and can be suitable for portable electronic equipment such as smart phones. The left side is the object side and the right side is the image side.

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 constituting the set of optical imaging lenses can be varied to achieve the various results and advantages described in the present specification without departing from the claimed technology. For example, although eight lenses are exemplified in the embodiments, the optical imaging lens group is not limited to include eight lenses. The optical imaging lens set can also comprise other numbers of lenses if needed.

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

It should be noted that any one of the following examples one to seven is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 4, an optical imaging lens assembly of the first example of the present application is described. Fig. 1 is a schematic diagram illustrating a structure of an optical imaging lens assembly according to a first example.

As shown in fig. 1, the optical imaging lens assembly includes, in order from an object side to an image side: the lens comprises 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 seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

The first lens E1 has positive power, and the object-facing surface S1 of the first lens is a concave surface, and the image-facing surface S2 of the first lens is a convex surface. The second lens E2 has positive power, the object-facing surface S3 of the second lens is a convex surface, and the image-facing surface S4 of the second lens is a convex surface. The third lens E3 has negative power, and its object-side surface S5 is concave, and its image-side surface S6 is convex. The fourth lens E4 has negative power, and its object-side surface S7 is convex and its image-side surface S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is a convex surface, and its image-side surface S10 is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is a convex surface, and its image-side surface S12 is a concave surface. The seventh lens E7 has positive power, and its object-side surface S13 is a convex surface, and its image-side surface S14 is a convex surface. The eighth lens E8 has negative power, and its object-side surface S15 is convex and its image-side surface S16 is concave. The filter E9 has a surface S17 facing the object side of the filter and a surface S18 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the optical imaging lens assembly is 5.03mm, the half Semi-FOV of the maximum field of view angle of the optical imaging lens assembly is 39.5 °, the total length TTL of the optical imaging lens assembly is 7.88mm and the image height ImgH is 4.28 mm.

Table 1 shows a table of basic structural parameters of the optical imaging lens assembly of example one, wherein the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 1

In an example one, a surface facing the object side and a surface facing the image side of any one of the first lens E1 through the eighth lens E8 are aspheric, and the surface type of each aspheric lens can be defined by, but is not limited to, the following aspheric 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 that can be used for each of the aspherical mirrors S1-S16 in example one.

TABLE 2

Fig. 2 shows on-axis aberration curves of the optical imaging lens assembly of the first example, which shows the deviation of the converging focuses of light rays with different wavelengths after passing through the optical imaging lens assembly. FIG. 3 shows an astigmatism curve representing meridional and sagittal image planes curvature for the first set of optical imaging lenses of example one. Fig. 4 shows distortion curves of the optical imaging lens assembly of the first example, which show values of distortion magnitudes corresponding to different angles of view.

As can be seen from fig. 2 to 4, the optical imaging lens assembly of the first example can achieve good imaging quality.

Example two

As shown in fig. 5 to 8, an optical 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. 5 is a schematic diagram of the optical imaging lens assembly of example two.

As shown in fig. 5, the optical imaging lens assembly, in order from an object side to an image side, comprises: the lens comprises 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 seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

The first lens E1 has positive power, and its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens element E2 has positive power, and the object-facing surface S3 of the second lens element is convex, and the image-facing surface S4 of the second lens element is convex. The third lens E3 has negative power, and its object-side surface S5 is concave, and its image-side surface S6 is convex. The fourth lens E4 has negative power, and its object-side surface S7 is convex and its image-side surface S8 is concave. The fifth lens E5 has positive power, and the object-facing surface S9 of the fifth lens is a concave surface, and the image-facing surface S10 of the fifth lens is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is convex and its image-side surface S12 is concave. The seventh lens E7 has positive power, and its object-side surface S13 is a convex surface, and its image-side surface S14 is a convex surface. The eighth lens E8 has negative power, and its object-side surface S15 is convex and its image-side surface S16 is concave. The filter E9 has a surface S17 facing the object side of the filter and a surface S18 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the set of optical imaging lenses is 5.17mm, the half Semi-FOV of the maximum field of view of the set of optical imaging lenses is 39.5 °, the total length TTL of the set of optical imaging lenses is 7.85mm and the image height ImgH is 4.35 mm.

Table 3 shows a table of basic structural parameters of the optical imaging lens assembly of example two, wherein the radius of curvature, thickness/distance, focal length, and effective radius are all 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.

TABLE 4

Fig. 6 shows an axial chromatic aberration curve of the optical imaging lens assembly of example two, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens assembly. FIG. 7 shows astigmatism curves of the optical imaging lens assembly of example two, which represent meridional field curvature and sagittal field curvature. FIG. 8 shows distortion curves for the second set of optical imaging lenses of example two, indicating distortion magnitude values for different field angles.

As can be seen from fig. 6 to 8, the optical imaging lens assembly of example two can achieve good imaging quality.

Example III

As shown in fig. 9 to 12, an optical imaging lens assembly of example three of the present application is described. FIG. 9 is a schematic diagram of the optical imaging lens assembly of example three.

As shown in fig. 9, the optical imaging lens assembly, in order from an object side to an image side, comprises: the lens comprises 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 seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

The first lens E1 has positive power, and its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens element E2 has positive power, and the object-facing surface S3 of the second lens element is convex, and the image-facing surface S4 of the second lens element is convex. The third lens E3 has positive power, and its object-side surface S5 is concave, and its image-side surface S6 is convex. The fourth lens E4 has negative power, and its object-side surface S7 is convex and its image-side surface S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens E6 has negative power, and its object-side surface S11 is convex and its image-side surface S12 is concave. The seventh lens E7 has positive power, and the object-facing surface S13 of the seventh lens is a convex surface, and the image-facing surface S14 of the seventh lens is a convex surface. The eighth lens E8 has negative power, and its object-side surface S15 is concave, and its image-side surface S16 is concave. The filter E9 has a surface S17 facing the object side of the filter and a surface S18 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the set of optical imaging lenses is 5.03mm, the half Semi-FOV of the maximum field of view of the set of optical imaging lenses is 39.5 °, the total length TTL of the set of optical imaging lenses is 7.85mm and the image height ImgH is 4.20 mm.

Table 5 shows a table of basic structural parameters for the optical imaging lens group of example three, wherein the units of the radius of curvature, thickness/distance, focal length, and effective radius are all 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. 10 shows on-axis chromatic aberration curves of the optical imaging lens group of example three, which indicate the deviation of the converging focuses of light rays with different wavelengths after passing through the optical imaging lens group. FIG. 11 shows the astigmatism curves for the optical imaging lens group of example three, representing meridional field curvature and sagittal field curvature. Fig. 12 shows distortion curves of the optical imaging lens assembly of example three, which show values of distortion magnitudes for different angles of view.

As can be seen from fig. 10 to 12, the optical imaging lens assembly of example three can achieve good imaging quality.

Example four

As shown in fig. 13 to 16, an optical imaging lens assembly of example four of the present application is described. FIG. 13 is a schematic diagram of the optical imaging lens assembly of example four.

As shown in fig. 13, the optical imaging lens assembly includes, in order from an object side to an image side: the image forming lens comprises 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 seventh lens E7, an eighth lens E8, a filter E9 and an image forming surface S19.

The first lens E1 has positive power, and its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has positive power, the object-facing surface S3 of the second lens is convex, and the image-facing surface S4 of the second lens is concave. The third lens E3 has positive power, and its object-side surface S5 is a convex surface, and its image-side surface S6 is a convex surface. The fourth lens E4 has negative power, and its object-side surface S7 is convex and its image-side surface S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is a convex surface, and its image-side surface S10 is a convex surface. The sixth lens E6 has negative power, and the object-facing surface S11 of the sixth lens is a concave surface, and the image-facing surface S12 of the sixth lens is a concave surface. The seventh lens E7 has positive power, and its object-side surface S13 is a convex surface, and its image-side surface S14 is a convex surface. The eighth lens E8 has negative power, and its object-side surface S15 is concave, and its image-side surface S16 is concave. The filter E9 has a surface S17 facing the object side of the filter and a surface S18 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the set of optical imaging lenses is 5.03mm, the half Semi-FOV of the maximum field of view of the set of optical imaging lenses is 39.5 °, the total length TTL of the set of optical imaging lenses is 7.85mm and the image height ImgH is 4.16 mm.

Table 7 shows a table of basic structural parameters of the optical imaging lens group of example four, wherein the units of the radius of curvature, thickness/distance, focal length, and effective radius are all 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. 14 shows an on-axis aberration curve of the optical imaging lens assembly of example four, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens assembly. FIG. 15 shows the astigmatism curves for the optical imaging lens assembly of example four, which represent meridional field curvature and sagittal field curvature. Fig. 16 shows a distortion curve of the optical imaging lens assembly of example four, which shows values of distortion magnitudes for different angles of view.

As can be seen from fig. 14 to 16, the optical imaging lens assembly of example four can achieve good imaging quality.

Example five

As shown in fig. 17 to 20, an optical imaging lens set of example five of the present application is described. FIG. 17 is a schematic diagram of the optical imaging lens assembly of example five.

As shown in fig. 17, the optical imaging lens assembly includes, in order from an object side to an image side: the lens comprises 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 seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

The first lens E1 has positive power, and its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has negative power, the object-facing surface S3 of the second lens is a convex surface, and the image-facing surface S4 of the second lens is a concave surface. The third lens E3 has positive power, and its object-side surface S5 is a convex surface, and its image-side surface S6 is a convex surface. The fourth lens E4 has negative power, and its object-side surface S7 is convex and its image-side surface S8 is concave. The fifth lens E5 has positive power, and the object-facing surface S9 of the fifth lens is a convex surface, and the image-facing surface S10 of the fifth lens is a convex surface. The sixth lens E6 has negative power, and the object-facing surface S11 of the sixth lens is a concave surface, and the image-facing surface S12 of the sixth lens is a concave surface. The seventh lens E7 has positive power, and its object-side surface S13 is a convex surface, and its image-side surface S14 is a convex surface. The eighth lens E8 has negative power, and its object-side surface S15 is concave, and its image-side surface S16 is concave. The filter E9 has a surface S17 facing the object side of the filter and a surface S18 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the set of optical imaging lenses is 5.03mm, the half of the maximum field of view Semi-FOV of the set of optical imaging lenses is 39.5 °, the total length TTL of the set of optical imaging lenses is 7.90mm and the image height ImgH is 4.23 mm.

Table 9 shows a table of basic structural parameters for the optical imaging lens group of example five, wherein the radius of curvature, thickness/distance, focal length, and effective radius are all 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.

TABLE 10

Fig. 18 shows an on-axis aberration curve of the optical imaging lens assembly of example five, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens assembly. FIG. 19 shows the astigmatism curves for the optical imaging lens assembly of example five, representing meridional and sagittal image planes curvature. Fig. 20 shows distortion curves of the optical imaging lens assembly of example five, which show values of distortion magnitudes for different angles of view.

As can be seen from fig. 18 to 20, the optical imaging lens assembly of example five can achieve good imaging quality.

Example six

Fig. 21 to 24 show an optical imaging lens assembly according to example six of the present application. FIG. 21 is a schematic diagram showing the structure of an optical imaging lens group of example six.

As shown in fig. 21, the optical imaging lens assembly, in order from an object side to an image side, comprises: the lens comprises 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 seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

The first lens E1 has positive power, and its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has positive power, the object-facing surface S3 of the second lens is convex, and the image-facing surface S4 of the second lens is concave. The third lens E3 has positive power, and the object-facing surface S5 of the third lens is a convex surface, and the image-facing surface S6 of the third lens is a convex surface. The fourth lens E4 has negative power, and its object-side surface S7 is convex and its image-side surface S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is a convex surface, and its image-side surface S10 is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is concave, and its image-side surface S12 is concave. The seventh lens E7 has positive power, and its object-side surface S13 is convex, and its image-side surface S14 is concave. The eighth lens element E8 has negative power, and its object-side surface S15 is concave, and its image-side surface S16 is concave. The filter E9 has a surface S17 facing the object side of the filter and a surface S18 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the set of optical imaging lenses is 5.18mm, the half Semi-FOV of the maximum field of view of the set of optical imaging lenses is 39.5 °, the total length TTL of the set of optical imaging lenses is 7.54mm and the image height ImgH is 4.36 mm.

Table 11 shows a basic structural parameter table of the optical imaging lens group of example six, in which the units of the radius of curvature, the thickness/distance, the focal length, and the effective radius are all 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.

TABLE 12

Fig. 22 shows an on-axis aberration curve of the optical imaging lens group of example six, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens group. FIG. 23 shows the astigmatism curves for the optical imaging lens group of example six, representing meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves of the optical imaging lens group of example six, which show values of distortion magnitudes for different angles of view.

As can be seen from fig. 22 to 24, the optical imaging lens assembly of example six can achieve good imaging quality.

Example seven

As shown in fig. 25 to 28, an optical imaging lens assembly of example seven of the present application is described. FIG. 25 is a schematic diagram showing the structure of an optical imaging lens assembly of example seven.

As shown in fig. 25, the optical imaging lens assembly, in order from an object side to an image side, comprises: the lens comprises 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 seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

The first lens E1 has positive power, and its object-side surface S1 is concave, and its image-side surface S2 is convex. The second lens E2 has positive power, the object-facing surface S3 of the second lens is convex, and the image-facing surface S4 of the second lens is concave. The third lens E3 has positive power, and its object-side surface S5 is a convex surface, and its image-side surface S6 is a convex surface. The fourth lens E4 has negative power, and its object-side surface S7 is convex and its image-side surface S8 is concave. The fifth lens E5 has positive power, and its object-side surface S9 is a convex surface, and its image-side surface S10 is a convex surface. The sixth lens E6 has negative power, and its object-side surface S11 is concave, and its image-side surface S12 is convex. The seventh lens E7 has positive power, and its object-side surface S13 is convex, and its image-side surface S14 is concave. The eighth lens E8 has negative power, and its object-side surface S15 is concave, and its image-side surface S16 is concave. The filter E9 has a surface S17 facing the object side of the filter and a surface S18 facing the image side of the filter. The light from the object passes through the respective surfaces S1 to S18 in order and is finally imaged on the imaging surface S19.

In this example, the total effective focal length f of the set of optical imaging lenses is 5.24mm, the half Semi-FOV of the maximum field of view of the set of optical imaging lenses is 39.3 °, the total length TTL of the set of optical imaging lenses is 7.60mm and the image height ImgH is 4.41 mm.

Table 13 shows a table of basic structural parameters of the optical imaging lens group of example seven, wherein the units of the radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

Watch 13

Table 14 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example seven, wherein each of the aspherical mirror surface types can be defined by formula (1) given in example one above.

Flour mark	A4	A6	A8	A10	A12
						S1	1.4091E+00	-1.0018E-01	3.6011E-04	-9.1099E-03	1.5425E-03
S2	1.1630E+00	-1.9348E-03	1.1898E-02	-4.4844E-03	4.6619E-04
						S3	-7.7444E-01	-2.1153E-02	-1.3530E-02	2.9077E-03	-6.5279E-04
S4	-4.7109E-01	-3.4718E-02	1.1605E-02	-1.3995E-03	4.3687E-04
						S5	2.1530E-01	3.9406E-03	1.8278E-02	-5.7881E-03	2.4882E-03
S6	2.9530E-01	-5.9820E-03	-2.5231E-03	-6.5582E-04	1.0851E-03
						S7	-6.3912E-01	7.9627E-03	4.7130E-03	2.8203E-03	-1.7882E-03
S8	-1.7335E-02	6.8998E-03	5.9857E-03	3.2219E-03	-6.3457E-04
						S9	1.9071E-01	1.4234E-02	-1.3084E-02	-7.7658E-04	2.7822E-04
S10	3.7758E-01	1.2165E-02	-2.0859E-02	-2.2286E-03	-7.7906E-03
						S11	2.3154E-01	1.3479E-02	-2.1581E-03	6.7105E-03	-7.9289E-03
S12	-4.1015E-01	9.8001E-02	-6.0826E-04	1.3464E-02	3.0205E-04
						S13	-1.1325E+00	-1.0609E-01	1.7392E-02	1.1614E-02	7.0340E-03
S14	-1.0425E+00	1.5084E-01	9.8826E-02	-4.5404E-02	-1.1981E-02
						S15	-1.1383E+00	6.3297E-01	-1.4181E-01	-9.3030E-04	-1.3602E-03
S16	-3.7968E+00	2.8190E-01	-2.4414E-01	4.7888E-02	-2.6048E-02
						Flour mark	A14	A16	A18	A20	A22
S1	-2.3326E-03	6.3655E-04	-2.5302E-04	3.6803E-05	0.0000E+00
						S2	-2.2065E-03	-3.6827E-04	-3.3588E-04	-5.8821E-05	0.0000E+00
S3	-4.2070E-04	-1.2762E-04	-9.0855E-06	0.0000E+00	0.0000E+00
						S4	-7.7340E-04	1.3854E-06	-7.1431E-07	7.3700E-07	0.0000E+00
S5	-5.2861E-04	2.3790E-04	1.5360E-05	1.5542E-06	0.0000E+00
						S6	2.1658E-04	-1.1271E-04	-4.1389E-07	0.0000E+00	0.0000E+00
S7	3.2155E-04	1.2359E-05	1.3289E-07	0.0000E+00	0.0000E+00
						S8	2.8284E-04	3.2697E-05	-9.8294E-07	8.2424E-07	0.0000E+00
S9	-8.4619E-05	4.9723E-05	1.4156E-08	0.0000E+00	0.0000E+00
						S10	1.3566E-03	-7.1567E-05	-1.0486E-06	-5.6005E-08	0.0000E+00
S11	1.1588E-03	-3.2873E-04	-1.8387E-06	0.0000E+00	0.0000E+00
						S12	1.4733E-03	2.7762E-04	-8.7574E-07	-1.4921E-07	0.0000E+00
S13	5.0686E-03	3.0470E-03	1.0062E-03	1.3204E-04	0.0000E+00
						S14	3.7355E-03	3.5672E-03	-5.2631E-04	-4.9240E-04	0.0000E+00
S15	9.2077E-03	-2.6545E-03	-6.3952E-04	2.3961E-04	-2.5289E-08
						S16	5.9699E-03	-3.7970E-03	1.4824E-03	-7.3713E-04	0.0000E+00

TABLE 14

Fig. 26 shows an on-axis aberration curve of the optical imaging lens assembly of example seven, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the optical imaging lens assembly. FIG. 27 is an astigmatism curve representing meridional and sagittal field curvatures for the optical imaging lens group of example seven. Fig. 28 shows a distortion curve of the optical imaging lens assembly of example seven, which shows values of distortion magnitude for different angles of view.

As can be seen from fig. 26 to 28, the optical imaging lens assembly of example seven can achieve good imaging quality.

To sum up, examples one to seven respectively satisfy the relationships shown in table 15.

Conditional formula/example	1	2	3	4	5	6	7
								f/EPD+ImgH/f	2.04	2.03	2.02	2.02	2.04	2.04	2.04
f6/f5	-0.95	-1.38	-1.36	-1.30	-1.95	-1.26	-1.19
								f7/(f7-f8)	0.17	0.41	0.54	0.60	0.66	0.63	0.62
f123/f567	0.47	0.75	1.12	1.14	0.98	0.83	0.79
								DT21/DT12	0.75	0.93	0.95	0.97	0.89	0.94	0.96
(DT41+DT42)/f4	-0.52	-0.40	-0.52	-0.36	-0.33	-0.35	-0.35
								(SAG21-SAG22)/CT2	0.57	0.58	0.56	0.50	0.40	0.48	0.49
SAG41/SAG42	0.55	0.48	0.36	0.37	0.46	0.44	0.41
								CT7/(SAG71+SAG72)	-0.80	-0.38	-0.61	-0.40	-0.32	-0.41	-0.40
R3/(R1+R2)	-1.06	-0.64	-0.72	-0.51	-0.55	-0.56	-0.49
								(R7-R8)/(R7+R8)	0.35	0.22	0.27	0.22	0.20	0.18	0.18
R10/(R10-R16)	0.88	0.64	0.58	0.46	0.54	0.52	0.53
								(CT3+CT4+CT5)/ΣAT	1.02	0.82	1.07	1.28	1.31	1.28	1.23
CT6/CT8	0.91	0.56	1.02	0.61	1.20	0.83	0.84

Watch 15

Table 16 shows the effective focal lengths f of the optical imaging lens assemblies of examples one to seven, the effective focal lengths f1 to f8 of the respective lenses, and so on.

Parameter/example	1	2	3	4	5	6	7
								f1(mm)	111.88	324.93	79.44	31.55	14.98	52.97	89.15
f2(mm)	4.37	5.01	6.29	25.29	-188.17	234.47	109.60
								f3(mm)	-29.70	-36.08	25.02	8.22	7.26	5.16	5.18
f4(mm)	-7.63	-10.19	-7.79	-11.19	-12.00	-11.51	-11.78
								f5(mm)	19.47	7.74	7.54	4.56	5.95	6.62	7.29
f6(mm)	-18.43	-10.65	-10.28	-5.91	-11.60	-8.36	-8.69
								f7(mm)	9.32	9.56	4.71	5.79	7.95	6.96	7.05
f8(mm)	-43.97	-13.72	-4.04	-3.94	-4.11	-4.04	-4.30
								f(mm)	5.03	5.17	5.03	5.03	5.03	5.18	5.24
TTL(mm)	7.88	7.85	7.85	7.85	7.90	7.54	7.60
								ImgH(mm)	4.28	4.35	4.20	4.16	4.23	4.36	4.41
Semi-FOV(°)	39.5	39.5	39.5	39.5	39.5	39.3	39.3
								f/EPD	1.19	1.19	1.19	1.19	1.20	1.20	1.20

TABLE 16

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 optical 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 optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising:

the first lens is provided with a concave surface facing the object side and a convex surface facing the image side;

a second lens;

a third lens;

the surface of the fourth lens, which faces the object side, is a convex surface, and the surface of the fourth lens, which faces the image side, is a concave surface;

a fifth lens;

a sixth lens;

a seventh lens;

an eighth lens;

the effective focal length f of the optical imaging lens group, the entrance pupil diameter EPD of the optical imaging lens group and the half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy the following conditions: f/EPD + ImgH/f < 2.5.

2. The set of optical imaging lenses of claim 1, wherein an effective focal length f5 of the fifth lens element and an effective focal length f6 of the sixth lens element satisfy: -2.0< f6/f5< -0.5.

3. The set of optical imaging lenses of claim 1, wherein an effective focal length f7 of the seventh lens and an effective focal length f8 of the eighth lens satisfy: 0< f7/(f7-f8) < 1.0.

4. The set of optical imaging lenses of claim 1, wherein a combined focal length f123 of the first, second and third lenses and a combined focal length f567 of the fifth, sixth and seventh lenses satisfy: 0.3< f123/f567< 1.3.

5. The optical imaging lens group of claim 1, wherein a maximum effective radius DT12 of the image-side facing surface of the first lens element and a maximum effective radius DT21 of the object-side facing surface of the second lens element satisfy: 0.5< DT21/DT12< 1.0.

6. The optical imaging lens group of claim 1, wherein a maximum effective radius DT41 of a surface of the fourth lens element facing the object side, a maximum effective radius DT42 of a surface of the fourth lens element facing the image side, and an effective focal length f4 of the fourth lens element satisfy: -0.7< (DT41+ DT42)/f4< -0.2.

7. The optical imaging lens group of claim 1, wherein an axial distance SAG21 from an intersection point of the surface of the second lens facing the object side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, an axial distance SAG22 from an intersection point of the surface of the second lens facing the image side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, and a central thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG21-SAG22)/CT2< 0.8.

8. The optical imaging lens group of claim 1, wherein an axial distance SAG41 between an intersection point of an object-side-facing surface of the fourth lens element and the optical axis and an effective radius vertex of the object-side-facing surface of the fourth lens element and an axial distance SAG42 between an intersection point of an image-side-facing surface of the fourth lens element and the optical axis and an effective radius vertex of the object-side-facing surface of the fourth lens element satisfy: 0.2< SAG41/SAG42< 0.7.

9. The optical imaging lens group of claim 1, wherein an axial distance SAG71 from an intersection point of an object-side-facing surface of the seventh lens element and the optical axis to an effective radius vertex of the object-side-facing surface of the seventh lens element, and an axial distance SAG72 from an intersection point of an image-side-facing surface of the seventh lens element and the optical axis to an effective radius vertex of the object-side-facing surface of the seventh lens element, satisfy the following relationship between a central thickness CT7 of the seventh lens element on the optical axis: -1.0< CT7/(SAG71+ SAG72) < -0.2.

10. The group of optical imaging lenses of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens element, the radius of curvature R2 of the image-side surface of the first lens element, and the radius of curvature R3 of the object-side surface of the second lens element satisfy: -1.5< R3/(R1+ R2) <0.

11. The optical imaging lens group of claim 1, wherein a radius of curvature R7 of a surface of the fourth lens element facing the object side and a radius of curvature R8 of a surface of the fourth lens element facing the image side satisfy: 0< (R7-R8)/(R7+ R8) < 1.0.

12. The group of optical imaging lenses of claim 1, wherein the radius of curvature R10 of the image-side facing surface of the fifth lens element and the radius of curvature R16 of the image-side facing surface of the eighth lens element satisfy: 0< R10/(R10-R16) < 1.0.

13. The set of optical imaging lenses of claim 1, wherein a central thickness CT3 of the third lens on the optical axis, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, and a sum Σ AT of air spaces on the optical axis between adjacent two of the first to eighth lenses satisfy: 0.5< (CT3+ CT4+ CT5)/Σ AT < 1.5.

14. The set of optical imaging lenses of claim 1, wherein a center thickness CT6 of the sixth lens on the optical axis and a center thickness CT8 of the eighth lens on the optical axis satisfy: 0.5< CT6/CT8< 1.5.

15. The optical imaging lens assembly of claim 1, wherein the first lens element has positive optical power and the image-side facing surface of the third lens element is convex.

16. The optical imaging lens set of claim 1, wherein the fourth lens element has a negative optical power and the fifth lens element has a positive optical power.

17. The optical imaging lens assembly as claimed in claim 1, wherein the seventh lens element has a positive power, a convex surface facing the object side of the seventh lens element, the eighth lens element has a negative power, and a concave surface facing the image side of the eighth lens element.

18. An optical imaging lens assembly, comprising, in order from an object side to an image side along an optical axis:

a second lens;

a third lens;

a fifth lens;

a sixth lens;

a seventh lens;

an eighth lens;

wherein an on-axis distance SAG21 between an intersection point of the surface of the second lens facing the object side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, an on-axis distance SAG22 between an intersection point of the surface of the second lens facing the image side and the optical axis to an effective radius vertex of the surface of the second lens facing the object side, and a central thickness CT2 of the second lens on the optical axis satisfy: 0.3< (SAG21-SAG22)/CT2< 0.8.

19. The optical imaging lens group of claim 18, wherein the effective focal length f of the optical imaging lens group, the entrance pupil diameter EPD of the optical imaging lens group, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: f/EPD + ImgH/f < 2.5; the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -2.0< f6/f5< -0.5.

20. The set of optical imaging lenses of claim 18, wherein an effective focal length f7 of the seventh lens and an effective focal length f8 of the eighth lens satisfy: 0< f7/(f7-f8) < 1.0; a combined focal length f123 of the first, second, and third lenses and a combined focal length f567 of the fifth, sixth, and seventh lenses satisfy: 0.3< f123/f567< 1.3.

21. The optical imaging lens group of claim 18, wherein a maximum effective radius DT12 of the image-side facing surface of the first lens element and a maximum effective radius DT21 of the object-side facing surface of the second lens element satisfy: 0.5< DT21/DT12< 1.0.

22. The optical imaging lens group of claim 18, wherein the maximum effective radius DT41 of the object-side facing surface of the fourth lens element, the maximum effective radius DT42 of the image-side facing surface of the fourth lens element and the effective focal length f4 of the fourth lens element satisfy: -0.7< (DT41+ DT42)/f4< -0.2.

23. The optical imaging lens group of claim 18, wherein an axial distance SAG41 from an intersection point of the optical axis and the object side surface of the fourth lens to an effective radius vertex of the object side surface of the fourth lens and an axial distance SAG42 from an intersection point of the optical axis and the image side surface of the fourth lens to an effective radius vertex of the object side surface of the fourth lens satisfy: 0.2< SAG41/SAG42< 0.7.

24. The optical imaging lens group of claim 18, wherein an axial distance SAG71 between an intersection point of an object-side-facing surface of the seventh lens element and the optical axis and an effective radius vertex of the object-side-facing surface of the seventh lens element, an axial distance SAG72 between an intersection point of an image-side-facing surface of the seventh lens element and the optical axis and an effective radius vertex of the object-side-facing surface of the seventh lens element, and a central thickness CT7 of the seventh lens element on the optical axis satisfy: -1.0< CT7/(SAG71+ SAG72) < -0.2.

25. The group of optical imaging lenses of claim 18, wherein the radius of curvature R1 of the object-side facing surface of the first lens element, the radius of curvature R2 of the image-side facing surface of the first lens element and the radius of curvature R3 of the object-side facing surface of the second lens element satisfy: -1.5< R3/(R1+ R2) <0.

26. The optical imaging lens group of claim 18, wherein a radius of curvature R7 of the object-facing surface of the fourth lens element and a radius of curvature R8 of the image-facing surface of the fourth lens element satisfy: 0< (R7-R8)/(R7+ R8) < 1.0.

27. The group of optical imaging lenses of claim 18, wherein the radius of curvature R10 of the image-side facing surface of the fifth lens element and the radius of curvature R16 of the image-side facing surface of the eighth lens element satisfy: 0< R10/(R10-R16) < 1.0.

28. The set of optical imaging lenses of claim 18, wherein a central thickness CT3 of the third lens on the optical axis, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis and a sum Σ AT of air spaces on the optical axis between two adjacent lenses of the first to eighth lenses satisfy: 0.5< (CT3+ CT4+ CT5)/Σ AT < 1.5.

29. The set of optical imaging lenses of claim 18, wherein a center thickness CT6 of the sixth lens on the optical axis and a center thickness CT8 of the eighth lens on the optical axis satisfy: 0.5< CT6/CT8< 1.5.

30. The optical imaging lens assembly of claim 18 wherein the first lens element has positive optical power and the image side facing surface of the third lens element is convex.

31. The optical imaging lens set of claim 18, wherein the fourth lens element has a negative optical power and the fifth lens element has a positive optical power.

32. The optical imaging lens assembly of claim 18 wherein the seventh lens element has a positive power, the object side surface of the seventh lens element is convex, the eighth lens element has a negative power, and the image side surface of the eighth lens element is concave.