CN116165768A

CN116165768A - Optical imaging lens group

Info

Publication number: CN116165768A
Application number: CN202210116073.1A
Authority: CN
Inventors: 张韵; 何旦; 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: 2021-11-24
Filing date: 2021-11-24
Publication date: 2023-05-26
Also published as: CN114047603A

Abstract

The application provides an optical imaging lens group, including in order from the object side to the image side along the optical axis: a first lens having positive optical power; a second lens having positive optical power, the object side surface of which is a convex surface; a third lens having optical power; a fourth lens element with optical power, the image-side surface of which is concave; a fifth lens having optical power, which is a meniscus lens having a concave object side; a sixth lens with optical power, the object side surface of which is a concave surface; a seventh lens having positive optical power, an image side surface of which is convex; and an eighth lens element with optical power, the image-side surface of which is convex; wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f7 of the seventh lens, and the effective focal length f8 of the eighth lens satisfy: 0.8< (f1+f2)/(f7+f8) <1.3.

Description

Optical imaging lens group

Statement of divisional application

The present application is a divisional application of a chinese patent application with the application number 202111404916.X, filed by month 11 and 24 of 2021, entitled "optical imaging lens group".

Technical Field

The present application relates to the field of optical elements, and more particularly, to an optical imaging lens group.

Background

In recent years, with the development of optical imaging lens group technology, there is a demand for optical imaging lens groups which are not only in characteristics of miniaturization, ultra-thin, and the like, but also in which the telephoto characteristics are beginning to increase. However, it is difficult for the conventional optical imaging lens group to satisfy the telephoto characteristic requirement of high imaging quality. Therefore, how to make the optical imaging lens group compatible with the telephoto characteristic and the high imaging quality has become one of the technical problems to be solved in the modern optical technical field.

Disclosure of Invention

In some embodiments, half of the effective pixel area diagonal length ImgH of the photosensitive element on the imaging surface of the optical imaging lens group meets the maximum field angle FOV of the optical imaging lens group: 10mm < ImgH/tan (FOV/2) <11mm.

In some embodiments, the separation distance T45 between the fourth lens element and the fifth lens element on the optical axis and the separation distance TD between the object side surface of the first lens element and the image side surface of the eighth lens element on the optical axis satisfy: 0.15< T45/TD <0.3.

In some embodiments, the distance Tr1r8 between the object side surface of the first lens element and the image side surface of the fourth lens element and the distance Tr9r16 between the object side surface of the fifth lens element and the image side surface of the eighth lens element on the optical axis satisfy the following conditions: 0.8< Tr1r8/Tr9r16 is less than or equal to 1.2.

In some embodiments, the radius of curvature R8 of the image side of the fourth lens and the radius of curvature R9 of the object side of the fifth lens satisfy: -1.2< R8/R9< -1.

In some embodiments, the effective half-caliber DT11 of the object side surface of the first lens, the effective half-caliber DT42 of the image side surface of the fourth lens, the effective half-caliber DT82 of the image side surface of the eighth lens, and the effective half-caliber DT51 of the object side surface of the fifth lens satisfy: 0.8< (DT 11-DT 42)/(DT 82-DT 51) <1.2.

In some embodiments, 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: 0.9< CT5/CT6<1.2.

In some embodiments, the distance BFL between the image side of the eighth lens element and the image plane of the optical imaging lens assembly and the distance TTL between the object side of the first lens element and the image plane on the optical axis satisfy: 0.3< BFL/TTL <0.6.

In some embodiments, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: -1.2< R3/R14< -0.8.

In some embodiments, the center thickness CT7 of the seventh lens on the optical axis and the center thickness CT8 of the eighth lens on the optical axis satisfy: 0.9< CT7/CT8<2.6.

In some embodiments, the separation distance T78 on the optical axis of the seventh lens and the eighth lens and the separation distance Tr13r16 on the optical axis of the object side surface of the seventh lens to the image side surface of the eighth lens satisfy: 0.3<10 xT 78/Tr13r16<0.7.

In some embodiments, the center thickness CT1 on the optical axis of the first lens, the center thickness CT2 on the optical axis of the second lens, the center thickness CT7 on the optical axis of the seventh lens, and the center thickness CT8 on the optical axis of the eighth lens satisfy: 0.8< (CT1+CT2)/(CT7+CT8) <1.2.

In some embodiments, the center thickness CT1 on the optical axis of the first lens, the center thickness CT4 on the optical axis of the fourth lens, the center thickness CT8 on the optical axis of the eighth lens, and the center thickness CT5 on the optical axis of the fifth lens satisfy: 0.9< (CT 1-CT 4)/(CT 8-CT 5) <2.

In some embodiments, the center thickness CT1 of the first lens on the optical axis and the center thickness CT8 of the eighth lens on the optical axis satisfy: 1< CT1/CT8<2.

In some embodiments, the distance SAG21 on the optical axis between the intersection of the object side surface of the second lens and the optical axis and the effective radius vertex of the object side surface of the second lens and the distance SAG72 on the optical axis between the intersection 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 satisfy: -1.1< SAG21/SAG72< -0.6

In some embodiments, the distance SAG42 between the intersection point of the image side surface of the fourth lens and the optical axis and the effective radius vertex of the image side surface of the fourth lens on the optical axis and the distance SAG51 between the intersection point of the object side surface of the fifth lens and the optical axis and the effective radius vertex of the object side surface of the fifth lens on the optical axis satisfy: -1< SAG42/SAG51< -0.4.

The application also provides an optical imaging lens group, which sequentially comprises from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having positive optical power, the object side surface of which is a convex surface; a third lens having optical power; a fourth lens element with optical power, the image-side surface of which is concave; a fifth lens having optical power, which is a meniscus lens having a concave object side; a sixth lens with optical power, the object side surface of which is a concave surface; a seventh lens having positive optical power, an image side surface of which is convex; and an eighth lens element with optical power, the image-side surface of which is convex; wherein, the interval distance T78 between the seventh lens and the eighth lens on the optical axis and the interval distance Tr13r16 between the object side surface of the seventh lens and the image side surface of the eighth lens on the optical axis satisfy: 0.3<10 xT 78/Tr13r16<0.7.

The eight-piece optical imaging lens group framework is adopted, and the focal power, the surface thickness, the center thickness, the axial spacing and the like of each lens are reasonably distributed, so that the optical imaging lens group has at least one beneficial effect of taking into account the characteristics of long-distance shooting, high resolution and the like.

Drawings

Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 1 of the present application;

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

fig. 3 shows a schematic structural view of an optical imaging lens group according to embodiment 2 of the present application;

fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 2;

fig. 5 shows a schematic structural view of an optical imaging lens group according to embodiment 3 of the present application;

fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 3;

fig. 7 shows a schematic structural view of an optical imaging lens group according to embodiment 4 of the present application;

fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 4;

Fig. 9 shows a schematic structural view of an optical imaging lens group according to embodiment 5 of the present application; and

fig. 10A to 10D 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 of embodiment 5.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in 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. In particular, 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 closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The features, principles, and other aspects of the present application are described in detail below.

The optical imaging lens group according to the exemplary embodiment of the present application may include, for example, eight lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The eight lenses are arranged in order from the object side to the image side along the optical axis. In the first lens to the eighth lens, any adjacent two lenses may have an air space therebetween.

In an exemplary embodiment, the first lens may have positive optical power; the second lens may have positive optical power, and an object side surface thereof may be convex; the third lens may have positive or negative optical power; the fourth lens can have positive optical power or negative optical power, and the image side surface of the fourth lens can be concave; the fifth lens element may have positive or negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be convex, i.e., the fifth lens element may be a meniscus lens element concave toward the object-side surface; the sixth lens can have positive focal power or negative focal power, and the object side surface of the sixth lens can be concave; the seventh lens may have positive optical power, and an image side surface thereof may be convex; the eighth lens element may have positive or negative optical power, and its image-side surface may be convex. The positive and negative focal powers and the surface types of the lenses are reasonably distributed, so that the first lens group formed by the first lens to the fourth lens and the second lens group formed by the fifth lens to the eighth lens are of double-Gaussian conjugate symmetrical structures, namely, the surface types of the lenses of the first lens group and the second lens group are of conjugate symmetrical effects, thereby being beneficial to balancing aberration and reducing the influence of spherical aberration on imaging quality.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.8< (f1+f2)/(f7+f8) <1.3, where f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f7 is an effective focal length of the seventh lens, and f8 is an effective focal length of the eighth lens. The optical imaging lens group satisfies: 0.8< (f1+f2)/(f7+f8) < 1.3), which is favorable for reasonably distributing the optical power of the optical imaging lens group, so that the positive spherical aberration and the negative spherical aberration of the first lens group and the second lens group are mutually counteracted. More specifically, f1, f2, f7, and f8 may satisfy: 0.8< (f1+f2)/(f7+f8) <1.2.

In an exemplary embodiment, the optical imaging lens group may satisfy 10mm < ImgH/tan (FOV/2) <11mm, where ImgH is half the diagonal length of the effective pixel area of the photosensitive element on the imaging surface of the optical imaging lens group, and FOV is the maximum field angle of the optical imaging lens group. The optical imaging lens group satisfies: 10mm < ImgH/tan (FOV/2) <11mm, the effective focal length EFL of the optical imaging lens group can be controlled within a reasonable range to realize the tele (telephoto) characteristic of the optical imaging lens group.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.15< T45/TD <0.3, where T45 is a separation distance of the fourth lens element and the fifth lens element on the optical axis, and TD is a separation distance of the object side surface of the first lens element to the image side surface of the eighth lens element on the optical axis. The optical imaging lens group satisfies: 0.15< T45/TD <0.3, which is advantageous to better balance aberrations through a double Gaussian conjugate symmetric structure.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.8< Tr1r8/Tr9r 16+.1.2, where Tr1r8 is a distance between the object side surface of the first lens element and the image side surface of the fourth lens element on the optical axis, and Tr9r16 is a distance between the object side surface of the fifth lens element and the image side surface of the eighth lens element on the optical axis. The optical imaging lens group satisfies: 0.8< Tr1r8/Tr9r16 is less than or equal to 1.2, which is favorable for better realizing the conjugate characteristic of the double Gaussian structure of the first lens group and the second lens group and balancing the aberration of the optical imaging lens group.

In an exemplary embodiment, the optical imaging lens group may satisfy-1.2 < R8/R9< -1 >, where R8 is a radius of curvature of the image side of the fourth lens and R9 is a radius of curvature of the object side of the fifth lens. The optical imaging lens group satisfies: -1.2< R8/R9< -1 >, the deflection angle of marginal rays of the optical imaging lens group can be reasonably controlled, and the sensitivity of the optical imaging lens group is effectively reduced.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.8< (DT 11-DT 42)/(DT 82-DT 51) <1.2, wherein DT11 is an effective half-caliber of an object side surface of the first lens, DT42 is an effective half-caliber of an image side surface of the fourth lens, DT82 is an effective half-caliber of an image side surface of the eighth lens, and DT51 is an effective half-caliber of an object side surface of the fifth lens. The optical imaging lens group satisfies: 0.8< (DT 11-DT 42)/(DT 82-DT 51) <1.2, the offset of the optical imaging lens group in the processing process can be effectively reduced, so that the marginal light transition of the optical imaging lens group is normal, and the deflection angle is normal and stable.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.9< CT5/CT6<1.2, where CT5 is a center thickness of the fifth lens on the optical axis and CT6 is a center thickness of the sixth lens on the optical axis. The optical imaging lens group satisfies: the ratio of 0.9< CT5/CT6<1.2, the distortion contribution of each field of view of the optical imaging lens group can be controlled within a reasonable range, and the imaging quality of the optical imaging lens group can be improved. More specifically, CT5 and CT6 may satisfy: 0.9< CT5/CT6<1.1.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.3< BFL/TTL <0.6, where BFL is a separation distance on the optical axis of the image side of the eighth lens to the imaging plane of the optical imaging lens group, and TTL is a separation distance on the optical axis of the object side of the first lens to the imaging plane of the optical imaging lens group. The optical imaging lens group satisfies: the BFL/TTL of 0.3< 0.6 is beneficial to balancing the high-quality telephoto characteristic and the miniaturization characteristic of the optical imaging lens group. More specifically, BFL and TTL may satisfy: 0.3< BFL/TTL <0.5.

In an exemplary embodiment, the optical imaging lens group may satisfy-1.2 < R3/R14< -0.8, where R3 is a radius of curvature of an object side of the second lens and R14 is a radius of curvature of an image side of the seventh lens. The optical imaging lens group satisfies: -1.2< R3/R14< -0.8, which is beneficial to balancing the aberration of the optical imaging lens group and improving the imaging quality of the optical imaging lens group. More specifically, R3 and R14 may satisfy: -1.1< R3/R14< -0.8.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.9< CT7/CT8<2.6, wherein CT7 is a center thickness of the seventh lens on the optical axis and CT8 is a center thickness of the eighth lens on the optical axis. The optical imaging lens group satisfies: the distortion amount of the optical imaging lens group is reasonably regulated and controlled by 0.9< CT7/CT8<2.6, so that the distortion of the optical imaging lens group is limited within a reasonable range. And the curvature of field of the external view field can be limited in a reasonable range.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.3<10×t78/Tr13r16<0.7, where T78 is a separation distance of the seventh lens and the eighth lens on the optical axis, and Tr13r16 is a separation distance of the object side surface of the seventh lens to the image side surface of the eighth lens on the optical axis. The optical imaging lens group satisfies: 0.3<10 xT 78/Tr13r16<0.7, can effectively control the total length of the optical imaging lens group, and is beneficial to realizing the telephoto characteristic of the optical imaging lens group. Meanwhile, the high sensitivity of the spacing distance between the seventh lens and the eighth lens on the optical axis to the curvature of field of the edge field can be effectively reduced, and the yield in the mass production process can be improved. More specifically, T78 and Tr13r16 may satisfy: 0.3<10 xT 78/Tr13r16<0.6.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.8< (CT 1+ CT 2)/(CT 7+ CT 8) <1.2, where CT1 is a center thickness of the first lens on the optical axis, CT2 is a center thickness of the second lens on the optical axis, CT7 is a center thickness of the seventh lens on the optical axis, and CT8 is a center thickness of the eighth lens on the optical axis. The optical imaging lens group satisfies: 0.8< (CT1+CT2)/(CT7+CT8) <1.2, can effectively control the total length of the whole optical imaging lens group, and is favorable for better realizing the telephoto characteristic of the optical imaging lens group. And meanwhile, the conjugate characteristic of the double Gaussian structures of the first lens group and the second lens group can be better realized, and the aberration of the optical imaging lens group can be balanced.

In an exemplary embodiment, the optical imaging lens group may satisfy 0.9< (CT 1-CT 4)/(CT 8-CT 5) <2, where CT1 is a center thickness of the first lens on the optical axis, CT4 is a center thickness of the fourth lens on the optical axis, CT8 is a center thickness of the eighth lens on the optical axis, and CT5 is a center thickness of the fifth lens on the optical axis. The optical imaging lens group satisfies: the conjugate characteristic of the double Gaussian structures of the first lens group and the second lens group can be better realized by 0.9< (CT 1-CT 4)/(CT 8-CT 5) <2, which is beneficial to balancing the aberration of the optical imaging lens group. More specifically, CT1, CT4, CT8, and CT5 may satisfy: 0.9< (CT 1-CT 4)/(CT 8-CT 5) <1.8.

In an exemplary embodiment, the optical imaging lens group may satisfy 1< CT1/CT8<2, where CT1 is a center thickness of the first lens on the optical axis and CT8 is a center thickness of the eighth lens on the optical axis. The optical imaging lens group satisfies: 1< CT1/CT8<2, is favorable for reasonably regulating and controlling the distortion amount of the optical imaging lens group, thereby limiting the distortion of the optical imaging lens group within a reasonable range. And meanwhile, the conjugate characteristic of the double Gaussian structures of the first lens group and the second lens group can be better realized, and the aberration of the optical imaging lens group can be balanced. More specifically, CT1 and CT8 may satisfy: 1< CT1/CT8<1.8.

In an exemplary embodiment, the optical imaging lens group may satisfy-1.1 < SAG21/SAG72< -0.6, wherein SAG21 is a distance on the optical axis between an intersection point of the object side surface of the second lens and the optical axis and an effective radius vertex of the object side surface of the second lens, and SAG72 is a distance on the optical axis 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. The optical imaging lens group satisfies: -1.1< SAG21/SAG72< -0.6, the conjugation characteristic between the second lens and the seventh lens can be better realized, the whole double Gaussian conjugation structure can be better realized, and the aberration of the optical imaging lens group can be balanced.

In an exemplary embodiment, the optical imaging lens group may satisfy-1 < SAG42/SAG51< -0.4, wherein SAG42 is a distance on the optical axis between an intersection point of the image side surface of the fourth lens and the optical axis and an effective radius vertex of the image side surface of the fourth lens, and SAG51 is a distance on the optical axis 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. The optical imaging lens group can satisfy the following conditions: 1< SAG42/SAG51< -0.4, the conjugation characteristic between the fourth lens and the fifth lens can be better realized, the whole double Gaussian conjugation structure can be better realized, and the aberration of the optical imaging lens group can be balanced. More specifically, SAG42 and SAG51 may satisfy: -0.8< SAG42/SAG51< -0.5.

In an exemplary embodiment, the optical imaging lens group may further include at least one diaphragm. The diaphragm may be provided at an appropriate position as required, for example, between the fourth lens and the fifth lens.

In an exemplary embodiment, the above optical imaging lens group may 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 according to the above-described embodiment of the present application may employ a plurality of lenses, for example, eight lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens, the volume of the optical imaging lens group can be effectively reduced, the sensitivity of the optical imaging lens group can be reduced, and the processability of the optical imaging lens group can be improved, so that the optical imaging lens group is more beneficial to production and processing and can be suitable for portable electronic products. The optical imaging lens group according to the embodiment of the present application also has at least one advantageous effect of telephoto characteristics, high imaging quality, and the like.

In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface of the first lens to the image side surface of the eighth lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens to the eighth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first to eighth lenses are aspherical mirror surfaces.

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

Specific examples of the optical imaging lens group applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

Example 1

An optical imaging lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 1 of the present application.

As shown in fig. 1, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the stop STO, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, and the filter E9. The first lens E1, the second lens E2, the third lens E3 and the fourth lens E4 are configured to form a first lens group, and the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are configured to form a second lens group, where the first lens group and the second lens group are of a double-gaussian conjugate symmetrical structure.

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

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

TABLE 1

In embodiment 1, the total effective focal length f of the optical imaging lens group is 10.35mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 is 13.66mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 is 3.85mm, and the maximum field angle FOV of the optical imaging lens group is 39.8 °.

In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical 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 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18 and a20 that can be used for each of the aspherical mirrors S1 to S16 in example 1.

TABLE 2

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 1, which indicates a converging focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 2B shows an astigmatism curve of the optical imaging lens group of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows distortion curves of the optical imaging lens group of embodiment 1, which represent distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 1, which represents deviations of different image heights of light rays on an imaging plane via the optical imaging lens group. As can be seen from fig. 2A to 2D, the optical imaging lens set provided in embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 2 of the present application.

As shown in fig. 3, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the stop STO, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, and the filter E9. The first lens E1, the second lens E2, the third lens E3 and the fourth lens E4 are configured to form a first lens group, and the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are configured to form a second lens group, where the first lens group and the second lens group are of a double-gaussian conjugate symmetrical structure.

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

In embodiment 2, the total effective focal length f of the optical imaging lens group is 10.29mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 is 12.83mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 is 3.85mm, and the maximum field angle FOV of the optical imaging lens group is 39.7 °.

Table 3 shows the basic parameter table of the optical imaging lens group of example 2, in which the units of radius of curvature, thickness, and focal length are all millimeters (mm). Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 3 Table 3

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

6.1623E-04

5.5765E-05

-6.2529E-05

-4.9025E-06

8.9765E-06

-2.3959E-06

2.9622E-07

-1.7930E-08

4.2775E-10

S2

6.7501E-03

-5.1181E-03

7.0898E-04

5.2915E-04

-2.7585E-04

5.9313E-05

-6.7807E-06

4.0428E-07

-9.9110E-09

S3

9.1987E-03

-7.2784E-03

2.3919E-03

-3.4461E-04

3.9273E-05

-1.3410E-05

2.7061E-06

-1.6487E-07

-2.3404E-09

S4

1.0027E-02

-8.0482E-03

2.4834E-03

-7.1049E-04

2.5258E-04

-7.0469E-05

1.1577E-05

-9.6557E-07

2.9957E-08

S5

7.7758E-03

-1.1753E-02

1.1332E-02

-8.8722E-03

4.4186E-03

-1.3064E-03

2.2319E-04

-2.0379E-05

7.7023E-07

S6

2.5398E-03

-6.4719E-03

1.1018E-02

-1.1636E-02

7.2346E-03

-2.6484E-03

5.5913E-04

-6.2961E-05

2.9296E-06

S7

-1.3693E-13

-1.0463E-15

2.6889E-15

-4.4363E-15

4.0903E-15

-2.1334E-15

6.3019E-16

-9.8637E-17

6.3707E-18

S8

-9.8582E-15

1.2507E-13

-5.7887E-13

1.3511E-12

-1.7975E-12

1.4251E-12

-6.6686E-13

1.7008E-13

-1.8239E-14

S9

2.5469E-02

-2.6905E-02

3.0936E-03

1.4879E-02

-1.2595E-02

5.3039E-03

-1.4682E-03

2.5512E-04

-1.9595E-05

S10

2.1217E-02

-4.8368E-03

-1.8993E-02

2.2059E-02

-9.5723E-03

1.7195E-03

-2.5544E-05

-2.9356E-05

2.6158E-06

S11

-1.2910E-02

5.1271E-02

-4.6923E-02

2.3181E-02

-7.0260E-03

1.3069E-03

-1.3881E-04

6.8118E-06

-6.0733E-08

S12

-6.8257E-02

6.8841E-02

-2.8890E-02

5.7548E-03

-5.4779E-04

1.7129E-05

1.0032E-06

-9.2221E-08

2.0174E-09

S13

-5.4996E-02

4.7145E-02

-1.8589E-02

6.7765E-03

-2.7285E-03

7.9015E-04

-1.3351E-04

1.1821E-05

-4.2451E-07

S14

-7.6048E-03

1.6739E-03

2.5850E-04

-1.4624E-04

3.2797E-05

-3.7770E-06

1.3717E-07

8.3530E-09

-5.9547E-10

S15

-2.6468E-03

-3.6539E-04

4.2075E-04

-1.0262E-04

1.4885E-05

-1.3977E-06

8.0037E-08

-2.4941E-09

3.2199E-11

S16

2.4064E-03

-1.6749E-03

4.3336E-04

-6.6022E-05

7.9912E-06

-7.0129E-07

3.7416E-08

-1.0536E-09

1.1965E-11

TABLE 4 Table 4

Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 2, which indicates a converging focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 4B shows an astigmatism curve of the optical imaging lens group of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the optical imaging lens group of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 2, which represents deviations of different image heights of light rays on an imaging plane via the optical imaging lens group. As can be seen from fig. 4A to 4D, the optical imaging lens group provided in embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural view of an optical imaging lens group according to embodiment 3 of the present application.

As shown in fig. 5, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the stop STO, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, and the filter E9. The first lens E1, the second lens E2, the third lens E3 and the fourth lens E4 are configured to form a first lens group, and the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are configured to form a second lens group, where the first lens group and the second lens group are of a double-gaussian conjugate symmetrical structure.

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

In embodiment 3, the total effective focal length f of the optical imaging lens group is 10.12mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 is 12.50mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 is 3.85mm, and the maximum field angle FOV of the optical imaging lens group is 39.7 °.

Table 5 shows the basic parameter table of the optical imaging lens group of example 3, in which the units of radius of curvature, thickness, and focal length are all millimeters (mm). Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 5

TABLE 6

Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 6B shows an astigmatism curve of the optical imaging lens group of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the optical imaging lens group of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 3, which represents the deviation of different image heights of light rays on the imaging plane via the optical imaging lens group. As can be seen from fig. 6A to 6D, the optical imaging lens group provided in embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural view of an optical imaging lens group according to embodiment 4 of the present application.

As shown in fig. 7, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the stop STO, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, and the filter E9. The first lens E1, the second lens E2, the third lens E3 and the fourth lens E4 are configured to form a first lens group, and the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are configured to form a second lens group, where the first lens group and the second lens group are of a double-gaussian conjugate symmetrical structure.

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

In embodiment 4, the total effective focal length f of the optical imaging lens group is 10.05mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 is 12.68mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 is 3.85mm, and the maximum field angle FOV of the optical imaging lens group is 40.1 °.

Table 7 shows the basic parameter table of the optical imaging lens group of example 4, in which the units of radius of curvature, thickness, and focal length are all millimeters (mm). Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 7

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

7.2982E-04

5.5994E-05

-7.7251E-05

2.1462E-05

-7.2087E-07

-6.4572E-07

1.1534E-07

-7.6858E-09

1.8417E-10

S2

5.4251E-03

-4.8047E-03

2.2457E-03

-5.9797E-04

9.4646E-05

-9.0647E-06

5.1570E-07

-1.6047E-08

2.1048E-10

S3

7.0871E-03

-4.5306E-03

1.8357E-03

-3.0073E-04

4.6342E-06

3.7779E-06

-8.5375E-07

2.0102E-07

-1.8185E-08

S4

7.2713E-03

-4.8933E-03

-1.0875E-04

7.8516E-04

-2.6082E-04

3.0006E-05

1.1226E-06

-5.1685E-07

2.9957E-08

S5

5.2839E-03

-5.9471E-03

2.7386E-03

-2.4767E-03

1.8249E-03

-6.9525E-04

1.3837E-04

-1.3793E-05

5.4211E-07

S6

-2.1615E-04

-2.2978E-03

3.3965E-03

-4.4780E-03

3.6158E-03

-1.6023E-03

3.8736E-04

-4.8107E-05

2.4026E-06

S7

-1.3682E-13

-2.6673E-15

7.1977E-15

-1.1502E-14

1.1062E-14

-6.3139E-15

2.0787E-15

-3.6357E-16

2.6119E-17

S8

-4.8001E-17

1.9555E-14

-1.6385E-13

5.4333E-13

-9.4249E-13

9.3469E-13

-5.3408E-13

1.6373E-13

-2.0866E-14

S9

-1.1658E-03

-5.1850E-04

3.0765E-05

-8.2479E-07

1.2853E-08

-1.2272E-10

5.4608E-13

3.6012E-14

-3.6734E-15

S10

1.5236E-04

-8.9470E-04

1.6404E-03

-7.7741E-04

1.7065E-04

-4.1656E-05

9.7819E-06

-1.1607E-06

4.9596E-08

S11

-1.0149E-02

5.7233E-03

-1.5010E-03

2.0146E-04

-1.5512E-05

7.1602E-07

-1.9605E-08

2.9363E-10

-1.8525E-12

S12

-6.2187E-02

3.5880E-02

-1.0454E-02

1.7480E-03

-1.7675E-04

1.1158E-05

-4.3537E-07

9.6960E-09

-9.4829E-11

S13

-3.4429E-02

1.7071E-02

-2.0489E-04

-1.8509E-03

6.5245E-04

-1.1318E-04

1.1030E-05

-5.7556E-07

1.2540E-08

S14

-1.8184E-02

5.2204E-03

1.7628E-05

-3.5128E-04

1.2155E-04

-2.2722E-05

2.4983E-06

-1.5005E-07

3.7451E-09

S15

-2.1376E-02

6.1843E-03

-8.1512E-04

6.1195E-05

-2.7871E-06

7.8239E-08

-1.3221E-09

1.2330E-11

-4.8758E-14

S16

-2.3669E-03

-1.1029E-03

3.9363E-04

-5.0083E-05

3.3223E-06

-1.2665E-07

2.8011E-09

-3.3516E-11

1.6841E-13

TABLE 8

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 8B shows an astigmatism curve of the optical imaging lens group of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the optical imaging lens group of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 4, which represents the deviation of different image heights of light rays on the imaging plane via the optical imaging lens group. As can be seen from fig. 8A to 8D, the optical imaging lens group provided in embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural view of an optical imaging lens group according to embodiment 5 of the present application.

As shown in fig. 9, the optical imaging lens assembly sequentially includes, from an object side to an image side along an optical axis: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the stop STO, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, and the filter E9. The first lens E1, the second lens E2, the third lens E3 and the fourth lens E4 are configured to form a first lens group, and the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are configured to form a second lens group, where the first lens group and the second lens group are of a double-gaussian conjugate symmetrical structure.

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

In embodiment 5, the total effective focal length f of the optical imaging lens group is 10.12mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 is 12.23mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 is 3.85mm, and the maximum field angle FOV of the optical imaging lens group is 39.7 °.

Table 9 shows the basic parameter table of the optical imaging lens group of example 5, in which the units of radius of curvature, thickness, and focal length are all millimeters (mm). Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 9

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

2.1613E-04

1.4034E-04

-6.4410E-05

1.3368E-05

-2.2844E-06

3.5391E-07

-3.9275E-08

2.3652E-09

-5.7049E-11

S2

1.6239E-03

-6.2130E-04

1.6301E-04

-2.2293E-05

1.7084E-06

-7.7648E-08

2.0884E-09

-3.0773E-11

1.9172E-13

S3

4.1622E-03

-9.2922E-04

2.4171E-04

6.3618E-06

-1.4392E-05

5.7166E-06

-1.4240E-06

1.7532E-07

-8.5101E-09

S4

1.3693E-02

-1.0450E-02

1.2973E-03

9.7405E-04

-4.4357E-04

7.1564E-05

-3.2014E-06

-3.3126E-07

2.9957E-08

S5

1.2032E-02

-1.2296E-02

2.0293E-03

1.6414E-03

-8.9973E-04

1.9689E-04

-2.2428E-05

1.3128E-06

-3.1262E-08

S6

1.1884E-03

-4.0726E-03

1.8667E-03

1.0083E-04

-1.2149E-04

-2.6621E-05

1.7051E-05

-2.5084E-06

1.2133E-07

S7

-1.3683E-13

1.9118E-15

-1.0689E-14

1.7513E-14

-1.4094E-14

6.2824E-15

-1.5747E-15

2.0677E-16

-1.0976E-17

S8

-1.4852E-15

3.2615E-15

3.4159E-14

-1.5793E-13

2.7889E-13

-2.5450E-13

1.2677E-13

-3.2559E-14

3.3474E-15

S9

-7.3965E-03

2.8011E-02

-1.4422E-02

-5.7145E-03

7.1544E-03

-2.5976E-03

4.6333E-04

-4.1392E-05

1.4832E-06

S10

-2.3686E-02

6.2170E-02

-3.6951E-02

4.0926E-03

5.2221E-03

-2.8813E-03

6.6898E-04

-7.5652E-05

3.3947E-06

S11

-1.4487E-02

3.1892E-02

-2.0804E-02

7.0318E-03

-1.3897E-03

1.6708E-04

-1.2077E-05

4.7741E-07

-7.6333E-09

S12

-6.6188E-02

4.7894E-02

-1.6719E-02

2.3823E-03

3.8523E-06

-3.8967E-05

4.4912E-06

-2.1361E-07

3.8273E-09

S13

-5.0802E-02

3.3117E-02

-3.4880E-03

-3.5028E-03

1.6911E-03

-3.5948E-04

4.1621E-05

-2.5472E-06

6.4718E-08

S14

-3.8075E-03

1.9018E-04

1.1400E-03

-7.0257E-04

2.4052E-04

-4.5414E-05

4.6759E-06

-2.4709E-07

5.2473E-09

S15

1.1242E-02

-2.5480E-03

1.8502E-04

-6.6896E-06

1.3899E-07

-1.7409E-09

1.3011E-11

-5.3507E-14

9.3283E-17

S16

6.2706E-03

-3.1517E-04

-2.1085E-04

2.8875E-05

-1.4467E-06

2.6188E-08

2.6475E-10

-1.6554E-11

1.7846E-13

Table 10

Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 5, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 10B shows an astigmatism curve of the optical imaging lens group of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the optical imaging lens group of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 5, which represents the deviation of different image heights of light rays on the imaging plane via the optical imaging lens group. As can be seen from fig. 10A to 10D, the optical imaging lens group provided in embodiment 5 can achieve good imaging quality.

In summary, examples 1 to 5 satisfy the relationships shown in table 11, respectively.

Conditional\embodiment	1	2	3	4	5
						(f1+f2)/(f7+f8)	1.15	0.87	0.98	1.02	1.08
ImgH/tan(FOV/2)	10.65	10.65	10.66	10.56	10.66
						T45/TD	0.21	0.18	0.19	0.19	0.20
Tr1r8/Tr9r16	0.89	0.93	1.01	0.92	1.12
						R8/R9	-1.01	-1.10	-1.08	-1.06	-1.06
(DT11-DT42)/(DT82-DT51)	0.92	0.96	1.07	0.98	1.19
						CT5/CT6	1.00	1.00	1.00	1.09	1.00
BFL/TTL	0.39	0.40	0.42	0.38	0.43
						R3/R14	-1.00	-0.80	-0.79	-0.93	-0.82
CT7/CT8	0.96	2.35	2.54	1.71	1.98
						10×T78/Tr13r16	0.37	0.39	0.44	0.52	0.53
(CT1+CT2)/(CT7+CT8)	0.83	0.82	0.91	0.84	1.10
						(CT1-CT4)/(CT8-CT5)	0.99	1.49	1.74	1.12	1.70
CT1/CT8	1.03	1.59	1.78	1.26	1.76
						SAG21/SAG72	-0.65	-0.70	-0.89	-0.70	-1.05
SAG42/SAG51	-0.54	-0.67	-0.63	-0.58	-0.68

TABLE 11

The present application also provides an imaging device, the electron-sensitive element of which may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or may be an imaging module integrated on an electronic device such as a smart phone. The imaging device is equipped with the above-described optical imaging lens group.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It should be understood by those skilled in the art that the scope of protection referred to in this application is not limited to the specific combination of the above technical features, but also encompasses other technical solutions formed by any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

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

A first lens having positive optical power;

a second lens having positive optical power, the object side surface of which is a convex surface;

a third lens having optical power;

a fourth lens element with optical power, the image-side surface of which is concave;

a fifth lens having optical power, which is a meniscus lens having a concave object side;

a sixth lens with optical power, the object side surface of which is a concave surface;

a seventh lens having positive optical power, an image side surface of which is convex; and

an eighth lens element with optical power having a convex image-side surface;

wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f7 of the seventh lens, and the eighth lens effective focal length f8 satisfy: 0.8< (f1+f2)/(f7+f8) <1.3.

2. The optical imaging lens group of claim 1, wherein half of the effective pixel area diagonal length ImgH of the photosensitive element on the imaging surface of the optical imaging lens group satisfies with the maximum field angle FOV of the optical imaging lens group: 10mm < ImgH/tan (FOV/2) <11mm.

3. The optical imaging lens group according to claim 1, wherein a separation distance T45 of the fourth lens element and the fifth lens element on the optical axis and a separation distance TD of an object side surface of the first lens element to an image side surface of the eighth lens element on the optical axis satisfy: 0.15< T45/TD <0.3.

4. The optical imaging lens group according to claim 1, wherein a separation distance Tr1r8 on the optical axis from an object side surface of the first lens to an image side surface of the fourth lens and a separation distance Tr9r16 on the optical axis from an object side surface of the fifth lens to an image side surface of the eighth lens satisfy: 0.8< Tr1r8/Tr9r16 is less than or equal to 1.2.

5. The optical imaging lens group according to claim 1, wherein a radius of curvature R8 of an image side surface of the fourth lens and a radius of curvature R9 of an object side surface of the fifth lens satisfy: -1.2< R8/R9< -1.

6. The optical imaging lens assembly of claim 1, wherein an effective half-caliber DT11 of an object side surface of the first lens, an effective half-caliber DT42 of an image side surface of the fourth lens, an effective half-caliber DT82 of an image side surface of the eighth lens, and an effective half-caliber DT51 of an object side surface of the fifth lens satisfy: 0.8< (DT 11-DT 42)/(DT 82-DT 51) <1.2.

7. The optical imaging lens group according to claim 1, wherein 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: 0.9< CT5/CT6<1.2.

8. The optical imaging lens group according to claim 1, wherein a separation distance BFL on the optical axis from an image side surface of the eighth lens to an imaging surface of the optical imaging lens group and a separation distance TTL on the optical axis from an object side surface of the first lens to the imaging surface satisfy: 0.3< BFL/TTL <0.6.

9. The optical imaging lens group according to claim 1, wherein a radius of curvature R3 of an object side surface of the second lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: -1.2< R3/R14< -0.8.

10. The optical imaging lens assembly is characterized in that the optical axis sequentially comprises, from an object side to an image side:

a first lens having positive optical power;

a third lens having optical power;

an eighth lens element with optical power having a convex image-side surface;

Wherein a separation distance T78 of the seventh lens and the eighth lens on the optical axis and a separation distance Tr13r16 of an object side surface of the seventh lens to an image side surface of the eighth lens on the optical axis satisfy: 0.3<10 xT 78/Tr13r16<0.7.