CN113759511B

CN113759511B - Optical imaging lens group

Info

Publication number: CN113759511B
Application number: CN202111081688.7A
Authority: CN
Inventors: 张韵; 吕赛锋; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2024-04-19
Anticipated expiration: 2041-09-15
Also published as: CN113759511A

Abstract

The invention 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 first lens is provided with positive focal power, and the object side surface of the first lens is a convex surface; the second lens is provided with focal power, and the image side surface of the second lens is a concave surface; a third lens having optical power; a fourth lens having optical power; a fifth lens having positive optical power, wherein an image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; a seventh lens having negative optical power; wherein, the effective focal length f of the optical imaging lens group and the maximum field angle FOV of the optical imaging lens group satisfy the following conditions: f tan (FOV/2) >5.5mm. The invention solves the problem that the miniaturization and the large image surface of the optical imaging lens group in the prior art are difficult to be simultaneously compatible.

Description

Optical imaging lens group

Technical Field

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

Background

In recent years, with the development of science and technology, the requirements of people on mobile phone lenses are also higher and higher, and mobile phone lenses with high imaging quality are getting more and more popular. However, as portable electronic products will be miniaturized, the requirements on the overall length of the camera lens are more and more strict, so that the degree of freedom of design is reduced and the design difficulty is increased. In order to meet the miniaturization requirement, an optical imaging system with the F number of the mobile phone imaging lens configured to be basically more than 2.0 and the F number of the mobile phone imaging lens below 2.0 is difficult to meet the imaging requirement of a higher order. Meanwhile, how to obtain higher imaging quality and smaller aberration under the conditions of large aperture and large image plane becomes a bottleneck which is difficult to break through.

That is, the optical imaging lens group in the prior art has a problem that it is difficult to achieve both miniaturization and large image plane.

Disclosure of Invention

The invention mainly aims to provide an optical imaging lens group so as to solve the problem that miniaturization and large image surface are difficult to be simultaneously combined in the optical imaging lens group in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens group comprising, in order from an object side to an image side along an optical axis: the first lens is provided with positive focal power, and the object side surface of the first lens is a convex surface; the second lens is provided with focal power, and the image side surface of the second lens is a concave surface; a third lens having optical power; a fourth lens having optical power; a fifth lens having positive optical power, wherein an image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; a seventh lens having negative optical power; wherein, the effective focal length f of the optical imaging lens group and the maximum field angle FOV of the optical imaging lens group satisfy the following conditions: f tan (FOV/2) >5.5mm.

Further, the effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group satisfy: 0<f/EPD <2.

Further, the effective focal length f5 of the fifth lens and the effective focal length f7 of the seventh lens satisfy: -1.8< f5/f7< -1.

Further, the effective focal length f1 of the first lens and the effective focal length f7 of the seventh lens satisfy: -1.2< f1/f7< -0.8.

Further, the on-axis distance TTL from the object side surface of the first lens element to the imaging surface of the optical imaging lens group and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfy: TTL/ImgH <1.55.

Further, the center thickness CT3 of the third lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy: 1.5< CT3/CT4<2.

Further, an on-axis spacing T56 between the fifth lens and the sixth lens and an on-axis spacing T45 between the fourth lens and the fifth lens satisfy: 0< T56/T45<0.5.

Further, the curvature radius R14 of the image side surface of the seventh lens and the effective focal length f of the optical imaging lens group satisfy: 0< R14/f <0.5.

Further, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 0.9< R11/R12<1.2.

Further, an on-axis spacing distance SAG22 between an intersection point of the image side surface of the second lens and the optical axis and an effective radius vertex of the image side surface of the second lens and an on-axis spacing distance SAG31 between an intersection point of the object side surface of the third lens and the optical axis and an effective radius vertex of the object side surface of the third lens satisfy: 2< SAG22/SAG31< -1.

Further, the on-axis spacing T56 between the fifth lens and the sixth lens, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 0<10 x t 56/(CT 5+ CT 6) <1.

Further, an on-axis separation distance SAG71 between an intersection point of the object side surface of the seventh lens and the optical axis and an effective radius vertex of the object side surface of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2.2< SAG71/CT7< -1.2.

Further, an on-axis separation distance SAG72 between an intersection point of the image side surface of the seventh lens and the optical axis and an effective radius vertex of the image side surface of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2< SAG72/CT7< -0.5.

Further, an on-axis spacing distance SAG52 between an intersection point of the image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy: -1< SAG52/CT5< -0.5.

Further, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT72 of the image side surface of the seventh lens satisfy: 0.3< DT11/DT72<0.6.

Further, the on-axis distance Tr9r14 between the object side surface of the fifth lens element and the image side surface of the seventh lens element and the maximum value MAX (DTr 9r 14) of the maximum effective radius of each surface between the object side surface of the fifth lens element and the image side surface of the seventh lens element satisfy: 0.5< Tr9r14/MAX (DTr 9r 14) <0.8.

Further, the maximum effective radius DT61 of the object side surface of the sixth lens element and the maximum effective radius DT52 of the image side surface of the fifth lens element satisfy the following conditions: 0< (DT 61-DT 52)/DT 52<0.3.

Further, the first lens satisfies between a center thickness CT1 on the optical axis and a maximum effective radius DT11 of the object side surface of the first lens: 0.4< CT1/DT11<0.7.

Further, an on-axis spacing distance SAG51 between an intersection point of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens, and an on-axis spacing distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and an intersection point of the image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens satisfy: -2.5< SAG 51/(CT 5-SAG 52) < -1.2.

Further, the abbe number V2 of the second lens and the abbe number V6 of the sixth lens satisfy: 0.5<2 x V2/V6<0.8.

According to another aspect of the present invention, there is provided an optical imaging lens group comprising, in order from an object side to an image side along an optical axis: the first lens is provided with positive focal power, and the object side surface of the first lens is a convex surface; the second lens is provided with focal power, and the image side surface of the second lens is a concave surface; a third lens having optical power; a fourth lens having optical power; a fifth lens having positive optical power, wherein an image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; a seventh lens having negative optical power; wherein an on-axis spacing T34 between the third lens and the fourth lens and an on-axis spacing T23 between the second lens and the third lens satisfy: t34 x 10/T23<1.

By applying the technical scheme of the invention, 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 and a seventh lens from an object side to an image side along an optical axis, wherein the first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has focal power, and the image side surface of the second lens is a concave surface; the third lens has optical power; the fourth lens has optical power; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the sixth lens is provided with focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the seventh lens has negative focal power; wherein, the effective focal length f of the optical imaging lens group and the maximum field angle FOV of the optical imaging lens group satisfy the following conditions: f tan (FOV/2) >5.5mm.

The optical power of each lens is reasonably distributed, so that low-order aberration generated by the optical imaging lens group is balanced, and the imaging quality of the optical imaging lens group is greatly improved. The relation between the effective focal length f of the optical imaging lens group and half of FOV/2 of the maximum field angle of the optical imaging lens group is restricted within a reasonable range, so that the sensitivity of tolerance can be reduced, the miniaturization of the system is guaranteed, and the imaging effect of the large image surface of the system is realized. In addition, the optical imaging lens group has the advantages of large aperture, large image plane and good imaging performance.

Drawings

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

FIG. 1 is a schematic view showing the structure of an optical imaging lens group according to an example I of the present invention;

Fig. 2 to 5 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group in fig. 1;

FIG. 6 is a schematic diagram showing the structure of an optical imaging lens group according to example II of the present invention;

Fig. 7 to 10 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group in fig. 6;

FIG. 11 is a schematic view showing the structure of an optical imaging lens group of example III of the present invention;

fig. 12 to 15 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group in fig. 11;

fig. 16 is a schematic view showing the structure of an optical imaging lens group of example four of the present invention;

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

fig. 21 is a schematic view showing the structure of an optical imaging lens group of example five of the present invention;

Fig. 22 to 25 show on-axis chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves, respectively, of the optical imaging lens group in fig. 21;

fig. 26 is a schematic diagram showing the structure of an optical imaging lens group of example six of the present invention;

fig. 27 to 30 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group in fig. 26;

fig. 31 is a schematic view showing the structure of an optical imaging lens group of example seven of the present invention;

fig. 32 to 35 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group in fig. 31;

Fig. 36 is a schematic view showing the structure of an optical imaging lens group of example eight of the present invention;

Fig. 37 to 40 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group in fig. 36.

Wherein the above figures include the following reference numerals:

STO and diaphragm; e1, a first lens; s1, an object side surface of a first lens; s2, an image side surface of the first lens; e2, a second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, a third lens; s5, the object side surface of the third lens is provided; s6, an image side surface of the third lens; e4, a fourth lens; s7, an object side surface of the fourth lens; s8, an image side surface of the fourth lens is provided; e5, a fifth lens; s9, an object side surface of the fifth lens; s10, an image side surface of the fifth lens; e6, a sixth lens; s11, an object side surface of the sixth lens; s12, an image side surface of the sixth lens; e7, seventh lens; s13, an object side surface of the seventh lens; s14, an image side surface of the seventh lens; e8, an optical filter; s15, the object side surface of the optical filter; s16, an image side surface of the optical filter; s17, an imaging surface.

Detailed Description

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

It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.

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

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

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the object side becomes the object side of the lens, and the surface of each lens near the image side is called the image side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.

In order to solve the problem that miniaturization and large image surface are difficult to be compatible at the same time in an optical imaging lens group in the prior art, the invention provides the optical imaging lens group.

Example 1

As shown in fig. 1 to 40, the optical imaging lens group sequentially includes, from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the first lens element has positive optical power, and an object side surface of the first lens element is convex; the second lens has focal power, and the image side surface of the second lens is a concave surface; the third lens has optical power; the fourth lens has optical power; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the sixth lens is provided with focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the seventh lens has negative focal power; wherein, the effective focal length f of the optical imaging lens group and the maximum field angle FOV of the optical imaging lens group satisfy the following conditions: f tan (FOV/2) >5.5mm.

Preferably 5.7mm < f tan (FOV/2) <5.9mm.

The optical power of each lens is reasonably distributed, so that low-order aberration generated by the optical imaging lens group is balanced, and the imaging quality of the optical imaging lens group is greatly improved. The relation between the effective focal length f of the optical imaging lens group and the maximum field angle FOV of the optical imaging lens group is restricted within a reasonable range, so that the sensitivity of tolerance can be reduced, the miniaturization of the system is ensured, and the imaging effect of a large image surface of the system is realized. In addition, the optical imaging lens group has the advantages of large aperture, large image plane and good imaging performance.

In the present embodiment, the effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group satisfy: 0<f/EPD <2. The focal power of the system is reasonably distributed, so that the F number of the system is smaller than 2, and the characteristic of large aperture can be realized. Preferably 1.6< f/EPD <1.8.

In the present embodiment, the effective focal length f5 of the fifth lens and the effective focal length f7 of the seventh lens satisfy: -1.8< f5/f7< -1. By reasonably controlling the ratio between the effective focal length f5 of the fifth lens and the effective focal length f7 of the seventh lens, the optical power of the system can be reasonably distributed, so that the positive and negative spherical differences of the front group lens and the rear group lens are mutually counteracted. Preferably, -1.6< f5/f7< -1.1.

In the present embodiment, the effective focal length f1 of the first lens and the effective focal length f7 of the seventh lens satisfy: -1.2< f1/f7< -0.8. By reasonably controlling the ratio between the effective focal length f1 of the first lens and the effective focal length f7 of the seventh lens, the optical power of the system can be reasonably distributed, so that the positive and negative spherical aberration of the front group lens and the rear group lens are mutually counteracted. Preferably, -1.1< f1/f7< -0.9.

In this embodiment, the on-axis distance TTL from the object side surface of the first lens element to the imaging surface of the optical imaging lens group and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfy: TTL/ImgH <1.55. The ratio between the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group is limited in a reasonable range, so that the size of the system is effectively compressed, and the ultrathin characteristic of the optical imaging lens group is ensured. Preferably 1.4< TTL/ImgH <1.50.

In the present embodiment, the center thickness CT3 of the third lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy: 1.5< CT3/CT4<2. By reasonably restricting the conditional expression, the distortion amount of the system can be reasonably regulated and controlled, and finally the distortion of the system is in a certain range. Preferably, 1.6< CT3/CT4<1.8.

In the present embodiment, the on-axis spacing T56 between the fifth lens and the sixth lens and the on-axis spacing T45 between the fourth lens and the fifth lens satisfy: 0< T56/T45<0.5. By reasonably restricting the conditional expression, the field curvature contribution of each view field can be controlled in a reasonable range, and the field curvature of the edge view field is mainly balanced. Preferably 0< T56/T45<0.3.

In the present embodiment, the curvature radius R14 of the image side surface of the seventh lens and the effective focal length f of the optical imaging lens group satisfy: 0< R14/f <0.5. By reasonably restricting the conditional expression, the deflection angle of the edge view field in the seventh lens can be controlled, and the sensitivity of the system can be effectively reduced. Preferably 0.3< R14/f <0.4.

In the present embodiment, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: 0.9< R11/R12<1.2. By reasonably restricting the conditional expression, the deflection angle of the light can be reduced, so that the deflection of the light path can be better realized by the system. Preferably, 1.0< R11/R12<1.1.

In the present embodiment, the on-axis spacing distance SAG22 between the intersection point of the image side surface of the second lens and the optical axis and the effective radius vertex of the image side surface of the second lens and the on-axis spacing distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the effective radius vertex of the object side surface of the third lens satisfy: 2< SAG22/SAG31< -1. The control of the condition is in a reasonable range, which is favorable for realizing the miniaturization of the module with better balance, and the spherical aberration of the second lens and the third lens are mutually counteracted. Preferably, -1.6< SAG22/SAG31< -1.2.

In the present embodiment, the on-axis spacing T56 between the fifth lens and the sixth lens, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 0<10 x t 56/(CT 5+ CT 6) <1. The total length of the optical system can be effectively controlled by reasonably restricting the conditional expression, so that the ultra-thin characteristic is realized; at the same time, the high sensitivity of the on-axis spacing between the fifth and sixth lenses to curvature of field with the fringe field can be effectively reduced. Preferably, 0.1<10×t56/(CT 5+ct 6) <0.7.

In the present embodiment, the on-axis separation distance SAG71 between the intersection point of the object side surface of the seventh lens and the optical axis and the effective radius vertex of the object side surface of the seventh lens and the center thickness CT7 of the seventh lens on the optical axis satisfy: 2.2< SAG71/CT7< -1.2. The incidence angle of the principal ray on the object side surface of the seventh lens can be effectively reduced by meeting the conditional expression, and the matching degree of the optical imaging lens group and the chip can be improved. Preferably, -2.1< SAG71/CT7< -1.2.

In the present embodiment, the on-axis separation distance SAG72 between the intersection point of the image side surface of the seventh lens and the optical axis and the effective radius vertex of the image side surface of the seventh lens and the center thickness CT7 of the seventh lens on the optical axis satisfy: 2< SAG72/CT7< -0.5. The incidence angle of the chief ray on the image side surface of the seventh lens can be effectively reduced by meeting the conditional expression, and the matching degree of the optical imaging lens group and the chip can be improved. Preferably, -2.0< SAG72/CT7< -0.8.

In the present embodiment, the on-axis spacing distance SAG52 between the intersection point of the image side surface of the fifth lens and the optical axis and the effective radius vertex of the image side surface of the fifth lens and the center thickness CT5 of the fifth lens on the optical axis satisfy: -1< SAG52/CT5< -0.5. By controlling the position relation of the fifth lens on the optical axis, the field curvature problem of the whole optical imaging lens group is effectively improved, and the astigmatism and coma contribution of the fifth lens in the whole system are reduced. Preferably, -0.9< SAG52/CT5< -0.7.

In the present embodiment, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT72 of the image side surface of the seventh lens satisfy the following conditions: 0.3< DT11/DT72<0.6. Through reasonably restricting the conditional expression, the light flux of the optical imaging lens group can be effectively increased, and the relative illumination of the edge view field is improved, so that the optical system has good imaging quality in a darker environment. Preferably 0.4< DT11/DT72<0.5.

In the present embodiment, the on-axis distance Tr9r14 between the object side surface of the fifth lens element and the image side surface of the seventh lens element and the maximum value MAX (DTr 9r 14) of the maximum effective radius of each surface between the object side surface of the fifth lens element and the image side surface of the seventh lens element satisfy: 0.5< Tr9r14/MAX (DTr 9r 14) <0.8. The curvature radius and the edge opening angle of the object side surface of the fifth lens and the image side surface of the seventh lens can be effectively controlled within a certain range by meeting the conditional expression, and the sensitivity of the fifth lens and the seventh lens is reduced; meanwhile, the meat thickness ratio of the fifth lens and the seventh lens is prevented from being too large, and the processability of the lenses is improved. Preferably, 0.6< Tr9r14/MAX (DTr 9r 14) <0.7.

In the present embodiment, the maximum effective radius DT61 of the object side surface of the sixth lens element and the maximum effective radius DT52 of the image side surface of the fifth lens element satisfy the following conditions: 0< (DT 61-DT 52)/DT 52<0.3. The system can ensure normal light transition and normal and stable deflection angles when the double diaphragms are switched. Preferably, 0< (DT 61-DT 52)/DT 52<0.2.

In the present embodiment, the center thickness CT1 of the first lens on the optical axis and the maximum effective radius DT11 of the object side surface of the first lens satisfy: 0.4< CT1/DT11<0.7. The condition is satisfied, so that the meat thickness ratio of the first lens is ensured to be in a reasonable range, and the processability of the lens is greatly improved. Preferably 0.5< CT1/DT11<0.6.

In the present embodiment, an on-axis spacing distance SAG51 between an intersection point of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens, an on-axis spacing distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and an intersection point of the image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens, satisfy: -2.5< SAG 51/(CT 5-SAG 52) < -1.2. The curvature radius and the edge opening angle of the object side surface of the fifth lens and the overall meat thickness ratio of the fifth lens can be controlled within a certain range by meeting the conditional expression, so that the sensitivity of the tolerance of the fifth lens is effectively reduced, and the processability is improved. Preferably, -2.4< SAG 51/(CT 5-SAG 52) < -1.4.

In the present embodiment, the abbe number V2 of the second lens and the abbe number V6 of the sixth lens satisfy: 0.5<2 x V2/V6<0.8. The refractive index difference between the materials of the second lens and the sixth lens can be effectively controlled by meeting the conditional expression, so that marginal rays are smoothly transited, and the performance of a marginal view field is improved; meanwhile, the excessive difference of the whole optical structure is prevented, and the manufacturability is improved. Preferably, 2 x V2/v6=0.65.

Example two

As shown in fig. 1 to 40, the optical imaging lens group sequentially includes, from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the first lens element has positive optical power, and an object side surface of the first lens element is convex; the second lens has focal power, and the image side surface of the second lens is a concave surface; the third lens has optical power; the fourth lens has optical power; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the sixth lens is provided with focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the seventh lens has negative focal power; wherein an on-axis spacing T34 between the third lens and the fourth lens and an on-axis spacing T23 between the second lens and the third lens satisfy: t34 x 10/T23<1. Preferably 0.4< T34 x 10/T23<1.

The optical power of each lens is reasonably distributed, so that low-order aberration generated by the optical imaging lens group is balanced, and the imaging quality of the optical imaging lens group is greatly improved. By controlling the relation between the on-axis spacing T34 between the third lens and the fourth lens and the on-axis spacing T23 between the second lens and the third lens within a reasonable range, the peak value of the fringe field of view and the field curvature contribution are mainly controlled within a reasonable range so as to ensure the imaging quality. In addition, the optical imaging lens group has the advantages of large aperture, large image plane and good imaging performance.

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

The optical imaging lens group in the present application may employ a plurality of lenses, for example, seven lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial distance between each lens and the like of each lens, the aperture of the optical imaging lens group can be effectively increased, the sensitivity of the lens is reduced, and the processability of the lens is improved, 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 and the like. The optical imaging lens group also has large aperture and large angle of view. The advantages of ultra-thin and good imaging quality can meet the miniaturization requirement of intelligent electronic products.

In an exemplary embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens may be glass lenses. The optical lens made of glass can restrain the shift of the back focus of the optical imaging lens group along with the change of temperature, so as to improve the stability of the system. Meanwhile, the adoption of the glass material can avoid the influence on the normal use of the lens due to the imaging blurring of the lens caused by the high and low temperature change in the use environment. For example, the temperature range of the optical imaging lens group with the full glass design is wider, and stable optical performance can be maintained within the range of-40 ℃ to 105 ℃. In particular, when the importance is attached to annotating image quality and reliability, the first lens to the seventh lens may each be a glass aspherical lens. Of course, in applications where the temperature stability requirement is low, the first lens to the seventh lens in the optical imaging lens group may be made of plastic. The optical lens is made of plastic, so that the manufacturing cost can be effectively reduced. Of course, the first lens to the seventh lens in the optical imaging lens group may also be made of plastic and glass in combination.

The application also provides an electronic device comprising the optical imaging lens group and an imaging element for converting an optical image formed by the optical imaging lens group into an electric signal. The imaging element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The electronic device may be a stand-alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The electronic device is equipped with the above-described optical imaging lens group.

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

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

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

Example one

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

As shown in fig. 1, the optical imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

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

In the present example, the total effective focal length f of the optical imaging lens group is 6.84mm, the maximum field angle FOV of the optical imaging lens group is 81.5 ° the total length TTL of the optical imaging lens group is 8.85mm and the image height ImgH is 6.00mm.

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

TABLE 1

In the first example, the object side surface and the image side surface of any one of the first lens element E1 to the seventh lens element E7 are aspheric, and the surface shape of each aspheric lens element can be defined by, but not limited to, the following aspheric formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for each of the aspherical mirrors S1-S14 in example one.

Face number	A4	A6	A8	A10	A12
						S1	-2.4592E-02	-1.1769E-02	-4.3913E-03	-1.2716E-03	-3.1270E-04
S2	-1.2223E-01	1.1966E-02	-6.4109E-03	1.1037E-03	-3.3129E-04
						S3	-2.3026E-01	2.8108E-02	-2.1739E-03	1.5254E-03	3.1202E-05
S4	-1.1020E-01	1.3817E-02	1.8230E-03	1.2955E-03	5.4455E-04
						S5	-2.0641E-01	-3.9570E-02	-1.0505E-03	1.2153E-03	7.7023E-04
S6	-2.3458E-01	-8.5589E-02	2.4792E-02	-6.7386E-03	-1.8731E-04
						S7	-2.9162E-01	8.8288E-03	2.0492E-02	-1.6600E-02	-1.3591E-03
S8	-4.6967E-01	8.1033E-02	1.1666E-02	-8.9560E-03	-3.4364E-05
						S9	1.3810E-01	3.0326E-02	3.1836E-02	-2.2693E-02	-2.8694E-03
S10	2.6272E-01	1.9079E-01	-8.4536E-03	-4.0550E-02	2.4643E-03
						S11	-2.7473E+00	1.0933E-01	1.5086E-01	-5.5219E-03	-5.9307E-03
S12	-2.7507E+00	4.4875E-02	5.6864E-02	-4.4363E-02	8.9158E-03
						S13	-4.1700E+00	1.1726E+00	-4.5093E-01	1.2181E-01	-3.8265E-02
S14	-3.4425E+00	1.0073E+00	-2.8031E-01	1.0868E-01	-4.3415E-02
						Face number	A14	A16	A18	A20
S1	-4.3179E-05	-1.2583E-05	0.0000E+00	0.0000E+00
						S2	6.5362E-05	-3.9173E-05	0.0000E+00	0.0000E+00
S3	7.2349E-05	-9.2150E-07	0.0000E+00	0.0000E+00
						S4	2.3940E-04	1.2113E-04	5.7004E-05	2.4763E-05
S5	2.6046E-04	1.6783E-04	7.3497E-05	5.8743E-05
						S6	-1.0381E-03	1.0382E-03	-2.8190E-04	7.5849E-05
S7	-8.3051E-04	8.0116E-04	-8.6821E-04	5.1653E-06
						S8	1.1650E-04	4.5468E-04	-9.0049E-05	1.0984E-04
S9	1.3971E-03	-3.1119E-05	-1.6186E-04	1.7563E-04
						S10	5.0341E-03	6.2184E-04	-1.3142E-03	3.4381E-04
S11	-1.5766E-02	-3.0466E-03	2.2422E-03	2.3150E-03
						S12	1.1560E-04	4.4393E-03	2.1266E-03	2.4191E-04
S13	1.4775E-02	-9.7112E-03	2.9070E-03	-4.0062E-04
						S14	6.4743E-03	-1.2123E-02	4.1459E-03	-4.1449E-03

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of an optical imaging lens group of example one, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 3 shows an astigmatism curve of an optical imaging lens group of example one, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4 shows distortion curves of an optical imaging lens group of example one, which represent distortion magnitude values corresponding to different angles of view. Fig. 5 shows a magnification chromatic aberration curve of the optical imaging lens group of example one, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group.

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

Example two

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

As shown in fig. 6, the optical imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

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

In the present example, the total effective focal length f of the optical imaging lens group is 6.89mm, the maximum field angle FOV of the optical imaging lens group is 80.4 ° the total length TTL of the optical imaging lens group is 8.86mm and the image height ImgH is 6.00mm.

Table 3 shows a basic structural parameter table of an optical imaging lens group of example two, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 3 Table 3

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

Face number	A4	A6	A8	A10	A12
						S1	-1.8435E-02	-9.8545E-03	-4.1720E-03	-1.3855E-03	-4.0105E-04
S2	-1.2145E-01	1.5685E-02	-6.8598E-03	1.3456E-03	-4.0480E-04
						S3	-2.3199E-01	2.8793E-02	-2.6506E-03	1.6298E-03	7.0755E-06
S4	-1.0946E-01	1.4141E-02	1.9899E-03	1.4265E-03	5.8271E-04
						S5	-1.9913E-01	-3.9403E-02	-1.2079E-03	1.5170E-03	9.5691E-04
S6	-2.3036E-01	-8.4225E-02	2.3942E-02	-6.0063E-03	3.9121E-04
						S7	-2.9231E-01	9.6083E-03	2.0186E-02	-1.6314E-02	-6.7115E-04
S8	-4.6623E-01	8.0113E-02	1.3052E-02	-9.1965E-03	1.2204E-03
						S9	1.2460E-01	3.7372E-02	3.4010E-02	-2.2619E-02	-1.5046E-03
S10	2.6920E-01	1.9106E-01	-6.8115E-03	-3.8001E-02	2.2690E-03
						S11	-2.7508E+00	1.0736E-01	1.5081E-01	-5.5066E-03	-3.8375E-03
S12	-2.7187E+00	4.3969E-02	5.6120E-02	-5.3343E-02	9.0890E-03
						S13	-2.7187E+00	4.3969E-02	5.6120E-02	-5.3343E-02	9.0890E-03
S14	-3.4888E+00	1.0112E+00	-2.6137E-01	9.8349E-02	-3.9680E-02
						Face number	A14	A16	A18	A20
S1	-9.1778E-05	-2.0631E-05	0.0000E+00	0.0000E+00
						S2	5.9303E-05	-5.8186E-05	0.0000E+00	0.0000E+00
S3	6.7810E-05	-9.2150E-07	0.0000E+00	0.0000E+00
						S4	2.3153E-04	1.0945E-04	4.3874E-05	1.8464E-05
S5	3.7122E-04	1.8563E-04	7.3346E-05	3.7829E-05
						S6	-9.9897E-04	1.0620E-03	-1.9141E-04	8.5197E-05
S7	-9.4363E-04	9.1565E-04	-7.4360E-04	6.5489E-06
						S8	2.1443E-04	5.0619E-04	-1.2039E-04	9.3566E-05
S9	1.8764E-03	-9.3498E-05	-2.6886E-04	1.8701E-04
						S10	5.0946E-03	4.7574E-04	-1.2003E-03	2.8766E-04
S11	-1.5206E-02	-3.0280E-03	2.4011E-03	2.1175E-03
						S12	-5.0316E-03	2.9662E-03	1.1180E-03	-1.0637E-04
S13	-5.0316E-03	2.9662E-03	1.1180E-03	-1.0637E-04
						S14	4.3396E-03	-1.1699E-02	3.7213E-03	-3.9692E-03

TABLE 4 Table 4

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

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

Example three

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

As shown in fig. 11, the optical imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

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

In the present example, the total effective focal length f of the optical imaging lens group is 7.01mm, the maximum field angle FOV of the optical imaging lens group is 79.5 ° the total length TTL of the optical imaging lens group is 8.86mm and the image height ImgH is 6.00mm.

Table 5 shows a basic structural parameter table of the optical imaging lens group of example three, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 5

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

Face number	A4	A6	A8	A10	A12
						S1	-1.6858E-02	-9.0129E-03	-4.0093E-03	-1.4271E-03	-4.3439E-04
S2	-1.1983E-01	1.6822E-02	-7.0695E-03	1.1663E-03	-5.0218E-04
						S3	-2.3326E-01	2.8493E-02	-3.0538E-03	1.5289E-03	-4.4305E-07
S4	-1.0910E-01	1.4768E-02	1.7673E-03	1.4686E-03	5.8937E-04
						S5	-2.0078E-01	-3.8526E-02	-1.6376E-03	1.6570E-03	1.2231E-03
S6	-2.2410E-01	-8.4413E-02	2.4892E-02	-4.8681E-03	7.0682E-04
						S7	-2.9533E-01	8.6939E-03	1.9679E-02	-1.7243E-02	-8.4955E-04
S8	-4.4868E-01	8.2138E-02	1.4540E-02	-9.6060E-03	2.3064E-03
						S9	1.0898E-01	4.2506E-02	3.3129E-02	-2.4005E-02	-2.2597E-03
S10	2.8426E-01	1.8802E-01	-6.9661E-03	-3.7684E-02	1.7667E-03
						S11	-2.7517E+00	1.0997E-01	1.5185E-01	-4.6792E-03	-5.2884E-03
S12	-2.6800E+00	6.2504E-02	5.6375E-02	-5.5212E-02	1.0133E-02
						S13	-4.2235E+00	1.1731E+00	-4.5064E-01	1.2296E-01	-3.8908E-02
S14	-3.6017E+00	1.0134E+00	-2.5581E-01	9.4302E-02	-3.7422E-02
						Face number	A14	A16	A18	A20
S1	-1.1023E-04	-1.7817E-05	0.0000E+00	0.0000E+00
						S2	2.8905E-06	-7.2526E-05	0.0000E+00	0.0000E+00
S3	5.4885E-05	-9.2150E-07	0.0000E+00	0.0000E+00
						S4	2.3606E-04	1.0521E-04	3.8737E-05	1.3095E-05
S5	4.9637E-04	2.3459E-04	7.7941E-05	3.9598E-05
						S6	-7.0384E-04	1.0971E-03	-1.5287E-04	5.6385E-05
S7	-1.2595E-03	5.8560E-04	-8.2082E-04	-3.7418E-05
						S8	-4.2771E-04	2.2559E-04	-4.4756E-06	2.2684E-04
S9	2.1695E-03	-9.4944E-05	-2.0035E-04	2.0388E-04
						S10	6.1434E-03	4.9814E-04	-1.2480E-03	3.9681E-05
S11	-1.6653E-02	-3.5259E-03	2.0921E-03	1.6116E-03
						S12	-7.1807E-03	2.8810E-03	2.1235E-04	-3.2973E-04
S13	1.5608E-02	-9.5846E-03	3.6564E-03	-8.3407E-04
						S14	4.1968E-03	-8.4703E-03	6.0773E-03	-2.3312E-03

TABLE 6

Fig. 12 shows an on-axis chromatic aberration curve of the optical imaging lens group of example three, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 13 shows an astigmatism curve of the optical imaging lens group of example three, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14 shows distortion curves of the optical imaging lens group of example three, which represent distortion magnitude values corresponding to different angles of view. Fig. 15 shows a magnification chromatic aberration curve of the optical imaging lens group of example three, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens group.

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

Example four

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

As shown in fig. 16, the optical imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

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

In the present example, the total effective focal length f of the optical imaging lens group is 7.12mm, the maximum field angle FOV of the optical imaging lens group is 78.6 ° the total length TTL of the optical imaging lens group is 8.86mm and the image height ImgH is 6.00mm.

Table 7 shows a basic structural parameter table of an optical imaging lens group of example four, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 7

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

Face number	A4	A6	A8	A10	A12
						S1	-1.4247E-02	-8.2005E-03	-4.0111E-03	-1.4508E-03	-4.2997E-04
S2	-1.1864E-01	1.9579E-02	-6.4004E-03	1.5345E-03	-3.8142E-04
						S3	-2.3495E-01	2.9544E-02	-2.7265E-03	1.6533E-03	3.7168E-05
S4	-1.0814E-01	1.5778E-02	2.1058E-03	1.6510E-03	6.6426E-04
						S5	-2.0096E-01	-3.6509E-02	-3.8159E-04	2.2396E-03	1.4234E-03
S6	-2.3586E-01	-7.8403E-02	2.5484E-02	-5.5949E-03	1.8584E-03
						S7	-2.9506E-01	5.2197E-03	1.9490E-02	-1.8869E-02	-7.4569E-05
S8	-4.3534E-01	8.7722E-02	1.5553E-02	-1.1131E-02	2.6272E-03
						S9	1.1428E-01	5.1803E-02	3.1112E-02	-2.2263E-02	-1.5641E-03
S10	2.8690E-01	1.8387E-01	-6.9632E-03	-3.6642E-02	2.3822E-03
						S11	-2.7514E+00	1.0727E-01	1.5161E-01	-1.1762E-02	-5.7338E-03
S12	-2.6459E+00	5.2708E-02	4.9737E-02	-5.7436E-02	1.2181E-02
						S13	-4.2167E+00	1.1755E+00	-4.5258E-01	1.2220E-01	-3.9474E-02
S14	-3.7046E+00	1.0138E+00	-2.6411E-01	7.1381E-02	-3.4903E-02
						Face number	A14	A16	A18	A20
S1	-9.7828E-05	-1.5180E-05	0.0000E+00	0.0000E+00
						S2	4.1366E-05	-5.6397E-05	0.0000E+00	0.0000E+00
S3	5.5329E-05	-9.2150E-07	0.0000E+00	0.0000E+00
						S4	2.6456E-04	1.1834E-04	4.1704E-05	1.5418E-05
S5	5.8252E-04	2.5853E-04	8.3831E-05	3.3144E-05
						S6	-4.3098E-04	1.1358E-03	-9.0043E-05	5.1745E-05
S7	-1.4308E-03	4.3980E-04	-7.5562E-04	-7.5589E-05
						S8	-1.7564E-04	2.0063E-04	-1.0926E-04	1.1439E-04
S9	2.4732E-03	-2.8215E-04	-2.0740E-04	1.4764E-04
						S10	5.6428E-03	2.4001E-05	-1.0942E-03	1.5889E-04
S11	-1.6646E-02	-3.8750E-03	1.5908E-03	1.5071E-03
						S12	-8.2402E-03	2.2468E-03	-1.3677E-04	-2.8493E-04
S13	1.6324E-02	-9.7384E-03	3.6802E-03	-8.2001E-04
						S14	8.8400E-03	-1.1051E-02	5.3856E-03	-1.9029E-03

TABLE 8

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

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

Example five

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

As shown in fig. 21, the optical imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

In the present example, the total effective focal length f of the optical imaging lens group is 6.95mm, the maximum field angle FOV of the optical imaging lens group is 79.7 ° the total length TTL of the optical imaging lens group is 9.00mm and the image height ImgH is 6.00mm.

Table 9 shows a basic structural parameter table of an optical imaging lens group of example five, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 9

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

Face number	A4	A6	A8	A10	A12
						S1	-2.2673E-02	-9.6859E-03	-3.5758E-03	-1.0318E-03	-2.7909E-04
S2	-1.2460E-01	1.5458E-02	-6.7138E-03	1.2957E-03	-3.5816E-04
						S3	-2.3036E-01	2.8789E-02	-3.2168E-03	1.4248E-03	-5.9400E-05
S4	-1.0993E-01	1.3243E-02	1.3296E-03	1.0427E-03	4.2199E-04
						S5	-1.9530E-01	-3.8454E-02	-1.4618E-03	1.0837E-03	6.7686E-04
S6	-2.2755E-01	-8.4203E-02	2.4082E-02	-6.5863E-03	6.7345E-04
						S7	-2.9623E-01	9.3286E-03	2.0037E-02	-1.5226E-02	1.6514E-04
S8	-4.6987E-01	8.0125E-02	1.3583E-02	-7.6288E-03	9.9503E-04
						S9	1.3832E-01	3.8226E-02	3.4435E-02	-2.2523E-02	-1.6487E-03
S10	2.6730E-01	1.9077E-01	-6.9739E-03	-3.8075E-02	2.5604E-03
						S11	-2.7522E+00	1.0458E-01	1.4723E-01	-8.1946E-03	-3.2727E-03
S12	-2.7550E+00	3.4899E-02	6.0534E-02	-5.5145E-02	5.4221E-03
						S13	-4.1831E+00	1.1749E+00	-4.4968E-01	1.2299E-01	-3.8182E-02
S14	-3.3263E+00	1.0399E+00	-2.7388E-01	1.2593E-01	-3.5578E-02
						Face number	A14	A16	A18	A20
S1	-4.5735E-05	-1.6548E-05	0.0000E+00	0.0000E+00
						S2	7.0364E-05	-3.8756E-05	0.0000E+00	0.0000E+00
S3	3.8871E-05	-9.2150E-07	0.0000E+00	0.0000E+00
						S4	1.4477E-04	7.6370E-05	3.0731E-05	1.8278E-05
S5	2.4157E-04	1.2770E-04	5.8501E-05	3.7252E-05
						S6	-1.2098E-03	1.0466E-03	-2.8089E-04	8.4000E-05
S7	-8.6046E-04	1.0088E-03	-7.0266E-04	6.5381E-05
						S8	4.0414E-04	4.7039E-04	-4.0993E-05	6.7481E-05
S9	2.4222E-03	-2.8613E-05	-2.6610E-04	1.1320E-04
						S10	4.6838E-03	5.5384E-04	-1.2895E-03	3.1700E-04
S11	-1.5873E-02	-3.0448E-03	2.0078E-03	2.1859E-03
						S12	-5.9360E-03	3.4227E-03	1.1459E-03	1.6516E-04
S13	1.5240E-02	-8.6918E-03	2.5215E-03	-3.2445E-04
						S14	5.4932E-03	-1.0042E-02	3.8439E-03	-4.1989E-03

Table 10

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

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

Example six

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

As shown in fig. 26, the optical imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

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

In the present example, the total effective focal length f of the optical imaging lens group is 7.03mm, the maximum field angle FOV of the optical imaging lens group is 79.3 ° the total length TTL of the optical imaging lens group is 9.00mm and the image height ImgH is 6.00mm.

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

TABLE 11

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

Face number	A4	A6	A8	A10	A12
						S1	-2.4186E-02	-9.1236E-03	-3.3101E-03	-9.3671E-04	-2.6186E-04
S2	-1.2502E-01	1.6180E-02	-6.7977E-03	1.2745E-03	-3.6743E-04
						S3	-2.3164E-01	2.8911E-02	-3.7836E-03	1.3466E-03	-9.8723E-05
S4	-1.1129E-01	1.3638E-02	8.2604E-04	9.5621E-04	3.5207E-04
						S5	-1.9660E-01	-3.5856E-02	-1.7881E-03	1.0721E-03	7.3223E-04
S6	-2.1326E-01	-8.7090E-02	2.4595E-02	-6.5604E-03	1.0090E-03
						S7	-2.9595E-01	4.4484E-03	1.9859E-02	-1.6541E-02	5.0642E-04
S8	-4.5892E-01	8.6609E-02	1.6968E-02	-7.0127E-03	2.0278E-03
						S9	1.3947E-01	4.7379E-02	3.4738E-02	-2.4111E-02	-2.7049E-03
S10	2.7944E-01	1.8429E-01	-8.4613E-03	-3.7777E-02	2.4761E-03
						S11	-2.7597E+00	1.1160E-01	1.4448E-01	-5.4229E-03	-3.5301E-03
S12	-2.7313E+00	4.6073E-02	5.8680E-02	-5.7773E-02	2.2698E-03
						S13	-4.1735E+00	1.1732E+00	-4.5115E-01	1.2210E-01	-3.8651E-02
S14	-3.3062E+00	1.0508E+00	-2.7784E-01	1.3895E-01	-3.3228E-02
						Face number	A14	A16	A18	A20
S1	-4.5493E-05	-1.7318E-05	0.0000E+00	0.0000E+00
						S2	6.7771E-05	-4.1204E-05	0.0000E+00	0.0000E+00
S3	2.6900E-05	-9.2486E-06	0.0000E+00	0.0000E+00
						S4	1.1403E-04	5.8445E-05	2.1476E-05	1.5971E-05
S5	2.6504E-04	1.2139E-04	4.8162E-05	3.1022E-05
						S6	-8.7453E-04	7.7911E-04	-1.7664E-04	1.8910E-05
S7	-1.0319E-03	3.8854E-04	-6.0603E-04	-4.2559E-05
						S8	1.6482E-04	-8.4933E-05	3.2812E-05	5.7753E-05
S9	2.8709E-03	-5.1325E-04	-1.8383E-04	6.7899E-05
						S10	5.2222E-03	2.9252E-04	-1.0879E-03	2.0273E-04
S11	-1.7442E-02	-3.0645E-03	1.8681E-03	1.7227E-03
						S12	-9.1257E-03	3.7125E-03	5.2545E-04	1.6412E-04
S13	1.5931E-02	-8.4139E-03	2.4396E-03	-4.6422E-04
						S14	7.4947E-03	-5.3166E-03	6.3321E-03	-3.0425E-03

Table 12

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

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

Example seven

As shown in fig. 31 to 35, an optical imaging lens group of example seven of the present application is described. Fig. 31 shows a schematic diagram of an optical imaging lens group structure of example seven.

As shown in fig. 31, the optical imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

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

In the present example, the total effective focal length f of the optical imaging lens group is 7.12mm, the maximum field angle FOV of the optical imaging lens group is 77.7 ° the total length TTL of the optical imaging lens group is 8.86mm and the image height ImgH is 5.91mm.

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

TABLE 13

Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example seven, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number	A4	A6	A8	A10	A12
						S1	-1.9233E-02	-6.8891E-03	-2.8526E-03	-9.3493E-04	-2.4412E-04
S2	-1.1677E-01	1.7402E-02	-4.1402E-03	1.4931E-03	-7.4750E-05
						S3	-2.3360E-01	2.5834E-02	-4.7063E-04	1.6194E-03	2.6912E-04
S4	-1.1008E-01	1.4066E-02	3.0557E-03	2.0351E-03	9.6995E-04
						S5	-2.0663E-01	-3.6604E-02	-6.0944E-05	2.5052E-03	1.6523E-03
S6	-2.4020E-01	-7.3655E-02	2.5298E-02	-5.5300E-03	2.6918E-03
						S7	-2.8720E-01	7.7033E-03	1.7162E-02	-1.8383E-02	6.3096E-04
S8	-4.4300E-01	8.5520E-02	1.3486E-02	-1.0643E-02	3.0207E-03
						S9	1.2651E-01	5.4405E-02	2.9698E-02	-1.9401E-02	-1.4407E-03
S10	2.9106E-01	1.8789E-01	-7.9102E-03	-3.5398E-02	1.8583E-03
						S11	-2.7445E+00	1.0877E-01	1.4441E-01	-1.3573E-02	-4.5222E-03
S12	-2.5991E+00	1.0775E-02	4.1251E-02	-5.4456E-02	1.5866E-02
						S13	-4.2199E+00	1.1863E+00	-4.5477E-01	1.2169E-01	-3.9238E-02
S14	-3.6061E+00	1.0301E+00	-2.6721E-01	5.9310E-02	-3.7166E-02
						Face number	A14	A16	A18	A20
S1	-4.8517E-05	-5.6701E-06	0.0000E+00	0.0000E+00
						S2	3.9982E-05	-3.1610E-05	0.0000E+00	0.0000E+00
S3	7.2117E-05	1.0457E-05	0.0000E+00	0.0000E+00
						S4	4.1113E-04	1.7979E-04	6.1927E-05	1.7423E-05
S5	7.3106E-04	3.3850E-04	1.1268E-04	4.2372E-05
						S6	-4.9701E-04	1.1128E-03	-1.4556E-04	6.1740E-05
S7	-1.5697E-03	4.5819E-04	-6.9297E-04	-1.6957E-05
						S8	6.0833E-04	5.5734E-04	-3.2831E-05	7.7770E-05
S9	2.7277E-03	-2.0432E-04	-2.2370E-04	-2.4901E-06
						S10	5.0778E-03	-2.7361E-04	-1.4130E-03	-8.2048E-05
S11	-1.6167E-02	-3.1663E-03	1.1288E-03	1.3850E-03
						S12	-6.8452E-03	4.1264E-03	3.9602E-04	3.3164E-04
S13	1.6490E-02	-9.2409E-03	3.2054E-03	-7.7535E-04
						S14	1.4059E-02	-1.1852E-02	4.4649E-03	-1.9504E-03

TABLE 14

Fig. 32 shows an on-axis chromatic aberration curve of the optical imaging lens group of example seven, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 33 shows an astigmatism curve of the optical imaging lens group of example seven, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 34 shows a distortion curve of the optical imaging lens group of example seven, which represents distortion magnitude values corresponding to different angles of view. Fig. 35 shows a magnification chromatic aberration curve of the optical imaging lens group of example seven, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens group.

As can be seen from fig. 32 to 35, the optical imaging lens group given in example seven can achieve good imaging quality.

Example eight

As shown in fig. 36 to 40, an optical imaging lens group of an example eight of the present application is described. Fig. 36 shows a schematic diagram of an optical imaging lens group structure of example eight.

As shown in fig. 36, the optical imaging lens assembly sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17.

In the present example, the total effective focal length f of the optical imaging lens group is 7.19mm, the maximum field angle FOV of the optical imaging lens group is 77.4 ° the total length TTL of the optical imaging lens group is 8.85mm and the image height ImgH is 5.91mm.

Table 15 shows a basic structural parameter table of an optical imaging lens group of example eight, in which the units of radius of curvature, thickness/distance, focal length, and effective radius are all millimeters (mm).

TABLE 15

Table 16 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example eight, where each of the aspherical surface types can be defined by equation (1) given in example one above.

Face number	A4	A6	A8	A10	A12
						S1	-1.7218E-02	-6.6395E-03	-2.8042E-03	-8.8960E-04	-1.9649E-04
S2	-1.1278E-01	1.8071E-02	-3.7367E-03	1.2839E-03	-3.1888E-04
						S3	-2.3321E-01	2.6069E-02	-1.1297E-05	1.5668E-03	2.2834E-04
S4	-1.0998E-01	1.4858E-02	3.1799E-03	1.8970E-03	8.3452E-04
						S5	-2.0672E-01	-3.6839E-02	-5.4651E-04	2.4480E-03	1.4535E-03
S6	-2.3763E-01	-7.2805E-02	2.5432E-02	-5.0076E-03	2.9280E-03
						S7	-2.8551E-01	8.0893E-03	1.6418E-02	-1.8708E-02	7.5615E-04
S8	-4.4050E-01	8.4073E-02	1.3932E-02	-1.0832E-02	3.5459E-03
						S9	1.2091E-01	5.6517E-02	2.9032E-02	-1.9469E-02	-1.2605E-03
S10	2.9418E-01	1.8572E-01	-7.4896E-03	-3.4065E-02	1.4801E-03
						S11	-2.7470E+00	1.1327E-01	1.4627E-01	-1.3224E-02	-3.4150E-03
S12	-2.6066E+00	1.7101E-02	4.0774E-02	-5.4677E-02	1.7470E-02
						S13	-4.2101E+00	1.1843E+00	-4.5607E-01	1.2176E-01	-3.9213E-02
S14	-3.6586E+00	1.0429E+00	-2.7133E-01	5.1659E-02	-3.6816E-02
						Face number	A14	A16	A18	A20
S1	-2.0314E-05	4.4109E-06	0.0000E+00	0.0000E+00
						S2	-8.5088E-05	-6.9161E-05	0.0000E+00	0.0000E+00
S3	4.8353E-05	1.6257E-07	0.0000E+00	0.0000E+00
						S4	3.3596E-04	1.3745E-04	4.6278E-05	1.2148E-05
S5	6.1903E-04	2.4044E-04	7.3937E-05	2.2505E-05
						S6	-4.3863E-04	1.0908E-03	-1.7540E-04	8.9180E-05
S7	-1.6240E-03	3.9837E-04	-6.7066E-04	4.0214E-05
						S8	5.6996E-04	5.7618E-04	5.1138E-05	1.2084E-04
S9	2.6605E-03	-2.7159E-04	-2.2310E-04	1.5765E-05
						S10	5.1932E-03	-3.1008E-04	-1.1266E-03	-1.1058E-04
S11	-1.6406E-02	-3.9375E-03	9.3269E-04	1.1337E-03
						S12	-7.5786E-03	4.4965E-03	3.0197E-04	3.7589E-04
S13	1.6724E-02	-9.3217E-03	3.1749E-03	-8.0962E-04
						S14	1.5021E-02	-9.8600E-03	5.8351E-03	-1.6195E-03

Table 16

Fig. 37 shows an on-axis chromatic aberration curve of the optical imaging lens group of example eight, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 38 shows an astigmatism curve of the optical imaging lens group of example eight, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 39 shows a distortion curve of the optical imaging lens group of example eight, which represents distortion magnitude values corresponding to different angles of view. Fig. 40 shows a magnification chromatic aberration curve of the optical imaging lens group of example eight, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens group.

As can be seen from fig. 37 to 40, the optical imaging lens group given in example eight can achieve good imaging quality.

In summary, examples one to eight satisfy the relationships shown in table 17, respectively.

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TABLE 17

Table 18 gives the effective focal lengths f of the optical imaging lens groups of examples one to eight, the effective focal lengths f1 to f5 of the respective lenses, and the like.

Parameter\example	1	2	3	4	5	6	7	8
									TTL(mm)	8.85	8.86	8.86	8.86	9.00	9.00	8.86	8.85
ImgH(mm)	6.00	6.00	6.00	6.00	6.00	6.00	5.91	5.91
									FOV(°)	81.5	80.4	79.5	78.6	79.7	79.3	77.7	77.4
f(mm)	6.84	6.89	7.01	7.12	6.95	7.03	7.12	7.19
									f1(mm)	7.78	7.62	7.58	7.44	7.66	7.64	7.69	7.57
f2(mm)	-27.37	-25.06	-24.55	-23.81	-25.00	-25.43	-26.70	-24.60
									f3(mm)	20.43	18.12	15.24	18.11	19.59	15.90	21.55	18.48
f4(mm)	-21.78	-21.17	-17.46	-21.39	-21.48	-17.45	-25.87	-25.43
									f5(mm)	8.78	8.85	9.26	10.04	8.72	9.50	10.83	10.75
f6(mm)	28345.73	-1530.03	-1469.28	-493.01	-4539.95	750.50	527.54	-193.24
									f7(mm)	-7.52	-6.93	-6.89	-7.11	-7.40	-7.70	-7.11	-6.88

TABLE 18

It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the 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 exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

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

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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 group, comprising, in order from an object side to an image side along an optical axis:

A first lens, wherein the first lens has positive focal power, and the object side surface of the first lens is a convex surface;

a second lens having negative optical power, an image side surface of the second lens being a concave surface;

a third lens having positive optical power;

a fourth lens having negative optical power;

a fifth lens having positive optical power, an image side surface of the fifth lens being a convex surface;

a sixth lens element with a convex object-side surface and a concave image-side surface;

a seventh lens having negative optical power;

Wherein, the effective focal length f of the optical imaging lens group and the maximum field angle FOV of the optical imaging lens group satisfy: f tan (FOV/2) >5.5mm;

The optical imaging lens group is composed of seven lenses from the first lens to the seventh lens; an effective focal length f5 of the fifth lens and an effective focal length f7 of the seventh lens satisfy: -1.8< f5/f7< -1.

2. The optical imaging lens group of claim 1, wherein an effective focal length f of the optical imaging lens group and an entrance pupil diameter EPD of the optical imaging lens group satisfy: 0<f/EPD <2.

3. The optical imaging lens group of claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f7 of the seventh lens satisfy: -1.2< f1/f7< -0.8.

4. The optical imaging lens group of claim 1, wherein an on-axis pitch TTL from an object side surface of the first lens to an imaging surface of the optical imaging lens group and a half of a diagonal length ImgH of an effective pixel area on the imaging surface of the optical imaging lens group satisfy: TTL/ImgH <1.55.

5. The optical imaging lens group according to claim 1, wherein a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 1.5< CT3/CT4<2.

6. The optical imaging lens group of claim 1, wherein an on-axis spacing T56 between the fifth lens and the sixth lens and an on-axis spacing T45 between the fourth lens and the fifth lens satisfy: 0< T56/T45<0.5.

7. The optical imaging lens group according to claim 1, wherein a radius of curvature R14 of an image side surface of the seventh lens and an effective focal length f of the optical imaging lens group satisfy: 0< R14/f <0.5.

8. The optical imaging lens group according to claim 1, wherein a radius of curvature R11 of an object side surface of the sixth lens and a radius of curvature R12 of an image side surface of the sixth lens satisfy: 0.9< R11/R12<1.2.

9. The optical imaging lens group according to claim 1, wherein an on-axis separation distance SAG22 between an intersection of the image side surface of the second lens and the optical axis to an effective radius vertex of the image side surface of the second lens and an on-axis separation distance SAG31 between an intersection of the object side surface of the third lens and the optical axis to an effective radius vertex of the object side surface of the third lens satisfy: 2< SAG22/SAG31< -1.

10. The optical imaging lens group according to claim 1, wherein an on-axis distance T56 between the fifth lens and the sixth lens, a center thickness CT5 of the fifth lens on the optical axis, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 0<10 x t 56/(CT 5+ CT 6) <1.

11. The optical imaging lens group according to claim 1, wherein an on-axis separation distance SAG71 between an intersection point of the object side surface of the seventh lens and the optical axis and an effective radius vertex of the object side surface of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2.2< SAG71/CT7< -1.2.

12. The optical imaging lens group according to claim 1, wherein an on-axis separation distance SAG72 between an intersection point of the image side surface of the seventh lens and the optical axis and an effective radius vertex of the image side surface of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2< SAG72/CT7< -0.5.

13. The optical imaging lens group according to claim 1, wherein an on-axis separation distance SAG52 between an intersection point of the image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy: -1< SAG52/CT5< -0.5.

14. The optical imaging lens assembly of claim 1, wherein a maximum effective radius DT11 of an object-side surface of the first lens and a maximum effective radius DT72 of an image-side surface of the seventh lens satisfy: 0.3< DT11/DT72<0.6.

15. The optical imaging lens group according to claim 1, wherein an on-axis distance Tr9r14 between an object side surface of the fifth lens and an image side surface of the seventh lens and a maximum value MAX (DTr 9r 14) of a maximum effective radius of each surface between the object side surface of the fifth lens and the image side surface of the seventh lens satisfy: 0.5< Tr9r14/MAX (DTr 9r 14) <0.8.

16. The optical imaging lens group according to claim 1, wherein a maximum effective radius DT61 of an object side surface of the sixth lens and a maximum effective radius DT52 of an image side surface of the fifth lens satisfy: 0< (DT 61-DT 52)/DT 52<0.3.

17. The optical imaging lens group according to claim 1, wherein a center thickness CT1 of the first lens on the optical axis and a maximum effective radius DT11 of an object side surface of the first lens satisfy: 0.4< CT1/DT11<0.7.

18. The optical imaging lens group according to claim 1, wherein an on-axis separation distance SAG51 between an intersection of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens, an on-axis separation distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and an intersection of the image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens, satisfy:

-2.5<SAG51/(CT5-SAG52)<-1.2。

19. The optical imaging lens group according to claim 1, wherein an abbe number V2 of the second lens and an abbe number V6 of the sixth lens satisfy: 0.5< 2x V2/V6<0.8.

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

a third lens having positive optical power;

a fourth lens having negative optical power;

a seventh lens having negative optical power;

wherein an on-axis spacing T34 between the third lens and the fourth lens and an on-axis spacing T23 between the second lens and the third lens satisfy: t34×10/T23<1;

21. The optical imaging lens group of claim 20, wherein an effective focal length f of the optical imaging lens group and an entrance pupil diameter EPD of the optical imaging lens group satisfy: 0<f/EPD <2.

22. The optical imaging lens assembly of claim 20, wherein an effective focal length f1 of the first lens and an effective focal length f7 of the seventh lens satisfy: -1.2< f1/f7< -0.8.

23. The optical imaging lens assembly of claim 20, wherein an on-axis spacing TTL of said first lens from an object side surface of said optical imaging lens assembly to an imaging surface of said optical imaging lens assembly is between half of a diagonal length ImgH of an effective pixel area on said imaging surface of said optical imaging lens assembly: TTL/ImgH <1.55.

24. The optical imaging lens group according to claim 20, wherein a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 1.5< CT3/CT4<2.

25. The optical imaging lens group of claim 20, wherein an on-axis spacing T56 between the fifth lens and the sixth lens and an on-axis spacing T45 between the fourth lens and the fifth lens satisfy: 0< T56/T45<0.5.

26. The optical imaging lens group of claim 20, wherein a radius of curvature R14 of an image side surface of said seventh lens and an effective focal length f of said optical imaging lens group satisfy: 0< R14/f <0.5.

27. The optical imaging lens assembly of claim 20, wherein a radius of curvature R11 of an object-side surface of said sixth lens and a radius of curvature R12 of an image-side surface of said sixth lens satisfy: 0.9< R11/R12<1.2.

28. The optical imaging lens assembly of claim 20, wherein an on-axis separation distance SAG22 between an intersection of an image side surface of the second lens and the optical axis to an effective radius vertex of the image side surface of the second lens and an on-axis separation distance SAG31 between an intersection of an object side surface of the third lens and the optical axis to an effective radius vertex of the object side surface of the third lens satisfy: 2< SAG22/SAG31< -1.

29. The optical imaging lens group according to claim 20, wherein an on-axis spacing T56 between the fifth lens and the sixth lens, a center thickness CT5 of the fifth lens on the optical axis, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 0<10 x t 56/(CT 5+ CT 6) <1.

30. The optical imaging lens group according to claim 20, wherein an on-axis separation distance SAG71 between an intersection of the object side surface of the seventh lens and the optical axis and an effective radius vertex of the object side surface of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2.2< SAG71/CT7< -1.2.

31. The optical imaging lens group according to claim 20, wherein an on-axis separation distance SAG72 between an intersection of an image side surface of the seventh lens and the optical axis and an effective radius vertex of the image side surface of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2< SAG72/CT7< -0.5.

32. The optical imaging lens group according to claim 20, wherein an on-axis separation distance SAG52 between an intersection of an image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy: -1< SAG52/CT5< -0.5.

33. The optical imaging lens assembly of claim 20, wherein a maximum effective radius DT11 of an object-side surface of the first lens and a maximum effective radius DT72 of an image-side surface of the seventh lens satisfy: 0.3< DT11/DT72<0.6.

34. The optical imaging lens assembly of claim 20, wherein an on-axis spacing Tr9r14 between an object-side surface of the fifth lens element and an image-side surface of the seventh lens element and a maximum value MAX (DTr 9r 14) of a maximum effective radius of each surface between the object-side surface of the fifth lens element and the image-side surface of the seventh lens element satisfy: 0.5< Tr9r14/MAX (DTr 9r 14) <0.8.

35. The optical imaging lens assembly of claim 20, wherein a maximum effective radius DT61 of an object-side surface of the sixth lens and a maximum effective radius DT52 of an image-side surface of the fifth lens satisfy: 0< (DT 61-DT 52)/DT 52<0.3.

36. The optical imaging lens group of claim 20, wherein a center thickness CT1 of the first lens on the optical axis and a maximum effective radius DT11 of an object side surface of the first lens satisfy: 0.4< CT1/DT11<0.7.

37. The optical imaging lens assembly of claim 20, wherein an on-axis separation distance SAG51 between an intersection of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens, an on-axis separation distance SAG52 between a center thickness CT5 of the fifth lens on the optical axis and an intersection of the image side surface of the fifth lens and the optical axis and an effective radius vertex of the image side surface of the fifth lens, is as follows:

-2.5<SAG51/(CT5-SAG52)<-1.2。

38. The optical imaging lens group according to claim 20, wherein an abbe number V2 of the second lens and an abbe number V6 of the sixth lens satisfy: 0.5<2 x V2/V6<0.8.