Optical imaging lens group

Abstract

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

Description

[0001] Divisional application statement

[0002] This application is a divisional application of the Chinese invention patent application filed on November 24, 2021, with the invention name “Optical imaging lens group” and application number 202111404916.X. Technical Field

[0003] The present application relates to the field of optical elements, and more specifically, to an optical imaging lens assembly. Background Art

[0004] In recent years, with the continuous development of optical imaging lens technology, the demand for optical imaging lens systems has increased beyond miniaturization and ultra-thinness, and has also increased demand for telephoto performance. However, conventional optical imaging lens systems struggle to meet the high-quality telephoto performance requirements. Therefore, achieving both telephoto performance and high-quality imaging in optical imaging lens systems has become a pressing technical challenge in modern optical technology. Summary of the Invention

[0005] The present application provides an optical imaging lens group, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens with positive optical power, whose object-side surface is convex; a third lens with optical power; a fourth lens with optical power, whose image-side surface is concave; a fifth lens with optical power, which is a meniscus lens with a concave object-side surface; a sixth lens with optical power, whose object-side surface is concave; a seventh lens with positive optical power, whose image-side surface is convex; and an eighth lens with optical power, whose image-side surface 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 the following: 0.8<(f1+f2) / (f7+f8)<1.3.

[0006] In some embodiments, half of the diagonal length ImgH of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens assembly and the maximum field of view FOV of the optical imaging lens assembly meet the following conditions: 10 mm <ImgH / tan(FOV / 2)<11mm。

[0007] In some embodiments, the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance TD between the object side surface of the first lens and the image side surface of the eighth lens on the optical axis satisfy: 0.15 <T45 / TD<0.3。

[0008] In some embodiments, the distance Tr1r8 between the object side surface of the first lens and the image side surface of the fourth lens on the optical axis and the distance Tr9r16 between the object side surface of the fifth lens and the image side surface of the eighth lens on the optical axis satisfy: 0.8 <Tr1r8 / Tr9r16≤1.2。

[0009] In some embodiments, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -1.2 <R8 / R9<-1。

[0010] In some embodiments, the effective semi-aperture DT11 of the object-side surface of the first lens, the effective semi-aperture DT42 of the image-side surface of the fourth lens, the effective semi-aperture DT82 of the image-side surface of the eighth lens, and the effective semi-aperture DT51 of the object-side surface of the fifth lens satisfy the following: 0.8<(DT11-DT42) / (DT82-DT51)<1.2.

[0011] 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。

[0012] In some embodiments, the distance BFL between the image side surface of the eighth lens and the imaging surface of the optical imaging lens group on the optical axis and the distance TTL between the object side surface of the first lens and the imaging surface on the optical axis satisfy the following conditions: 0.3 <BFL / TTL<0.6。

[0013] In some embodiments, the curvature radius R3 of the object-side surface of the second lens and the curvature radius R14 of the image-side surface of the seventh lens satisfy: -1.2 <R3 / R14<-0.8。

[0014] 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。

[0015] In some embodiments, a distance T78 between the seventh lens and the eighth lens on the optical axis and a distance Tr13r16 from the object-side surface of the seventh lens to the image-side surface of the eighth lens on the optical axis satisfy: 0.3<10×T78 / Tr13r16<0.7.

[0016] In some embodiments, a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy: 0.8<(CT1+CT2) / (CT7+CT8)<1.2.

[0017] In some embodiments, a center thickness CT1 of the first lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT8 of the eighth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy: 0.9<(CT1-CT4) / (CT8-CT5)<2.

[0018] 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。

[0019] In some embodiments, the distance SAG21 between the intersection of the object-side surface of the second lens and the optical axis and the vertex of the effective radius of the object-side surface of the second lens on the optical axis and the distance SAG72 between the intersection of the image-side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image-side surface of the seventh lens on the optical axis satisfy the following conditions: -1.1 <SAG21 / SAG72<-0.6

[0020] In some embodiments, the distance SAG42 between the intersection of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens on the optical axis and the distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens on the optical axis satisfy: <SAG42 / SAG51<-0.4。

[0021] The present application also provides an optical imaging lens group, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens with positive optical power, whose object-side surface is convex; a third lens with optical power; a fourth lens with optical power, whose image-side surface is concave; a fifth lens with optical power, which is a meniscus lens with a concave object-side surface; a sixth lens with optical power, whose object-side surface is concave; a seventh lens with positive optical power, whose image-side surface is convex; and an eighth lens with optical power, whose image-side surface is convex; wherein, the spacing distance T78 between the seventh lens and the eighth lens on the optical axis and the spacing distance Tr13r16 from the object-side surface of the seventh lens to the image-side surface of the eighth lens on the optical axis satisfy: 0.3<10×T78 / Tr13r16<0.7.

[0022] In some embodiments, half of the diagonal length ImgH of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens assembly and the maximum field of view FOV of the optical imaging lens assembly meet the following conditions: 10 mm <ImgH / tan(FOV / 2)<11mm。

[0023] In some embodiments, the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance TD between the object side surface of the first lens and the image side surface of the eighth lens on the optical axis satisfy: 0.15 <T45 / TD<0.3。

[0024] In some embodiments, the distance Tr1r8 between the object side surface of the first lens and the image side surface of the fourth lens on the optical axis and the distance Tr9r16 between the object side surface of the fifth lens and the image side surface of the eighth lens on the optical axis satisfy: 0.8 <Tr1r8 / Tr9r16≤1.2。

[0025] In some embodiments, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -1.2 <R8 / R9<-1。

[0026] In some embodiments, the effective semi-aperture DT11 of the object-side surface of the first lens, the effective semi-aperture DT42 of the image-side surface of the fourth lens, the effective semi-aperture DT82 of the image-side surface of the eighth lens, and the effective semi-aperture DT51 of the object-side surface of the fifth lens satisfy the following: 0.8<(DT11-DT42) / (DT82-DT51)<1.2.

[0027] 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。

[0028] In some embodiments, the distance BFL between the image side surface of the eighth lens and the imaging surface of the optical imaging lens group on the optical axis and the distance TTL between the object side surface of the first lens and the imaging surface on the optical axis satisfy the following conditions: 0.3 <BFL / TTL<0.6。

[0029] In some embodiments, the curvature radius R3 of the object-side surface of the second lens and the curvature radius R14 of the image-side surface of the seventh lens satisfy: -1.2 <R3 / R14<-0.8。

[0030] 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。

[0031] In some embodiments, a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy: 0.8<(CT1+CT2) / (CT7+CT8)<1.2.

[0032] In some embodiments, a center thickness CT1 of the first lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT8 of the eighth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy: 0.9<(CT1-CT4) / (CT8-CT5)<2.

[0033] 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。

[0034] In some embodiments, the distance SAG21 between the intersection of the object-side surface of the second lens and the optical axis and the vertex of the effective radius of the object-side surface of the second lens on the optical axis and the distance SAG72 between the intersection of the image-side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image-side surface of the seventh lens on the optical axis satisfy the following conditions: -1.1 <SAG21 / SAG72<-0.6

[0035] In some embodiments, the distance SAG42 between the intersection of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens on the optical axis and the distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens on the optical axis satisfy: <SAG42 / SAG51<-0.4。

[0036] The present application adopts an eight-piece optical imaging lens group architecture. By rationally allocating the optical focal length, surface shape, center thickness of each lens, and on-axis spacing between lenses, the above-mentioned optical imaging lens group has at least one beneficial effect of taking into account both telephoto and high-resolution characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0038] Figure 1 1 shows a schematic structural diagram of an optical imaging lens assembly according to Example 1 of the present application;

[0039] Figures 2A to 2D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens assembly of Example 1 are respectively shown;

[0040] Figure 3 1 shows a schematic structural diagram of an optical imaging lens assembly according to Example 2 of the present application;

[0041] Figures 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens assembly of Example 2 are respectively shown;

[0042] Figure 5 1 shows a schematic structural diagram of an optical imaging lens assembly according to Example 3 of the present application;

[0043] 6A to 6DThe axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens assembly of Example 3 are respectively shown;

[0044] Figure 7 1 shows a schematic structural diagram of an optical imaging lens assembly according to Example 4 of the present application;

[0045] Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens assembly of Example 4 are respectively shown;

[0046] Figure 9 shows a schematic structural diagram of an optical imaging lens assembly according to Example 5 of the present application; and

[0047] 10A to 10D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens group of Example 5 are respectively shown. DETAILED DESCRIPTION

[0048] 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 descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0049] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0050] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0051] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0052] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0053] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0054] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0055] The features, principles and other aspects of the present application are described in detail below.

[0056] The optical imaging lens assembly according to an exemplary embodiment of the present application may include, for example, eight lenses having optical power, namely, 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. These eight lenses are arranged sequentially along the optical axis from the object side to the image side. Among the first through eighth lenses, any two adjacent lenses may have an air gap between them.

[0057] In an exemplary embodiment, the first lens may have a positive focal power; the second lens may have a positive focal power, and its object side may be convex; the third lens may have a positive or negative focal power; the fourth lens may have a positive or negative focal power, and its image side may be concave; the fifth lens may have a positive or negative focal power, its object side may be concave, and its image side may be convex, that is, the fifth lens may be a meniscus lens concave toward the object side; the sixth lens may have a positive or negative focal power, and its object side may be concave; the seventh lens may have a positive focal power, and its image side may be convex; the eighth lens may have a positive or negative focal power, and its image side may be convex. By reasonably distributing the positive and negative focal powers and surface types of each lens, the first lens group composed of the first lens to the fourth lens and the second lens group composed of the fifth lens to the eighth lens form a double-Gauss conjugate symmetric structure, that is, the surface types of each lens in the first lens group and the second lens group exhibit a conjugate symmetric effect, which is conducive to balancing aberrations and more conducive to reducing the impact of spherical aberration on imaging quality.

[0058] In an exemplary embodiment, the optical imaging lens group may satisfy 0.8 < (f1 + f2) / (f7 + f8) < 1.3, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens. The optical imaging lens group satisfying 0.8 < (f1 + f2) / (f7 + f8) < 1.3 is conducive to reasonably distributing the focal power of the optical imaging lens group, so that the positive and negative spherical aberrations of the first lens group and the second lens group cancel each other out. More specifically, f1, f2, f7, and f8 may satisfy: 0.8 < (f1 + f2) / (f7 + f8) < 1.2.

[0059] In an exemplary embodiment, the optical imaging lens group may satisfy 10 mm < ImgH / tan(FOV / 2) < 11 mm, where ImgH is half of 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 satisfying 10 mm < ImgH / tan(FOV / 2) < 11 mm can control the effective focal length EFL of the optical imaging lens group within a reasonable range to achieve the long focal length (telephoto) characteristics of the optical imaging lens group.

[0060] In an exemplary embodiment, the optical imaging lens group may satisfy 0.15 < T45 / TD < 0.3, where T45 is the distance between the fourth lens and the fifth lens on the optical axis, and TD is the distance between the object side of the first lens and the image side of the eighth lens on the optical axis. The optical imaging lens group satisfying 0.15 < T45 / TD < 0.3 is conducive to better balancing aberrations through the double-Gauss conjugate symmetric structure.

[0061] In an exemplary embodiment, the optical imaging lens group may satisfy 0.8 < Tr1r8 / Tr9r16 ≤ 1.2, where Tr1r8 is the distance on the optical axis from the object side surface of the first lens to the image side surface of the fourth lens, and Tr9r16 is the distance on the optical axis from the object side surface of the fifth lens to the image side surface of the eighth lens. The optical imaging lens group satisfying 0.8 < Tr1r8 / Tr9r16 ≤ 1.2 is beneficial to better realizing the conjugate characteristics of the double-Gauss structure of the first lens group and the second lens group and is beneficial to balancing the aberrations of the optical imaging lens group.

[0062] In an exemplary embodiment, the optical imaging lens group may satisfy -1.2 < R8 / R9 < -1, where R8 is the radius of curvature of the image side surface of the fourth lens and R9 is the radius of curvature of the object side surface of the fifth lens. The optical imaging lens group satisfying -1.2 < R8 / R9 < -1 can reasonably control the deflection angle of the marginal rays of the optical imaging lens group and is beneficial to effectively reducing the sensitivity of the optical imaging lens group.

[0063] In an exemplary embodiment, the optical imaging lens group may satisfy 0.8 < (DT11 - DT42) / (DT82 - DT51) < 1.2, where DT11 is the effective semi-aperture of the object side surface of the first lens, DT42 is the effective semi-aperture of the image side surface of the fourth lens, DT82 is the effective semi-aperture of the image side surface of the eighth lens, and DT51 is the effective semi-aperture of the object side surface of the fifth lens. The optical imaging lens group satisfying 0.8 < (DT11 - DT42) / (DT82 - DT51) < 1.2 can effectively reduce the step difference during the processing of the optical imaging lens group, making the marginal rays of the optical imaging lens group transition normally and the deflection angle normal and stable.

[0064] In an exemplary embodiment, the optical imaging lens group may satisfy 0.9 < CT5 / CT6 < 1.2, where CT5 is the central thickness of the fifth lens on the optical axis and CT6 is the central thickness of the sixth lens on the optical axis. The optical imaging lens group satisfying 0.9 < CT5 / CT6 < 1.2 can control the contribution of the field curvature of each field of the optical imaging lens group within a reasonable range and is beneficial to improving the imaging quality of the optical imaging lens group. More specifically, CT5 and CT6 may satisfy 0.9 < CT5 / CT6 < 1.1.

[0065] In an exemplary embodiment, the optical imaging lens group may satisfy 0.3 < BFL / TTL < 0.6, where BFL is the distance along the optical axis from the image side of the eighth lens to the imaging surface of the optical imaging lens group, and TTL is the distance along the optical axis from the object side of the first lens to the imaging surface of the optical imaging lens group. The optical imaging lens group satisfying 0.3 < BFL / TTL < 0.6 is beneficial to balancing the high-quality telephoto characteristics and miniaturization characteristics of the optical imaging lens group. More specifically, BFL and TTL may satisfy 0.3 < BFL / TTL < 0.5.

[0066] In an exemplary embodiment, the optical imaging lens group may satisfy -1.2 < R3 / R14 < -0.8, where R3 is the radius of curvature of the object side of the second lens and R14 is the radius of curvature of the image side of the seventh lens. The optical imaging lens group satisfying -1.2 < R3 / R14 < -0.8 is beneficial to balancing the aberrations of the optical imaging lens group and is beneficial to improving the imaging quality of the optical imaging lens group. More specifically, R3 and R14 may satisfy -1.1 < R3 / R14 < -0.8.

[0067] In an exemplary embodiment, the optical imaging lens group may satisfy 0.9 < CT7 / CT8 < 2.6, where CT7 is the central thickness of the seventh lens along the optical axis and CT8 is the central thickness of the eighth lens along the optical axis. The optical imaging lens group satisfying 0.9 < CT7 / CT8 < 2.6 is beneficial to reasonably regulating the distortion amount of the optical imaging lens group, thereby limiting the distortion of the optical imaging lens group within a reasonable range. At the same time, the field curvature of the outer field of view can also be limited within a reasonable range.

[0068] In an exemplary embodiment, the optical imaging lens group may satisfy 0.3 < 10×T78 / Tr13r16 < 0.7, where T78 is the distance along the optical axis between the seventh lens and the eighth lens, and Tr13r16 is the distance along the optical axis from the object side of the seventh lens to the image side of the eighth lens. The optical imaging lens group satisfying 0.3 < 10×T78 / Tr13r16 < 0.7 can effectively control the total length of the optical imaging lens group and is beneficial to realizing the telephoto characteristics of the optical imaging lens group. At the same time, the high sensitivity of the field curvature of the edge field of view to the distance along the optical axis between the seventh lens and the eighth lens can be effectively reduced, which is beneficial to improving the yield rate during mass production. More specifically, T78 and Tr13r16 may satisfy 0.3 < 10×T78 / Tr13r16 < 0.6.

[0069] In an exemplary embodiment, the optical imaging lens group may satisfy 0.8 < (CT1 + CT2) / (CT7 + CT8) < 1.2, where CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, CT7 is the central thickness of the seventh lens on the optical axis, and CT8 is the central thickness of the eighth lens on the optical axis. The optical imaging lens group satisfying 0.8 < (CT1 + CT2) / (CT7 + CT8) < 1.2 can effectively control the total length of the entire optical imaging lens group, which is beneficial to better realizing the telephoto characteristics of the optical imaging lens group. At the same time, it can also better realize the conjugate characteristics of the double-Gauss structure of the first lens group and the second lens group, which is beneficial to balancing the aberrations of the optical imaging lens group.

[0070] In an exemplary embodiment, the optical imaging lens group may satisfy 0.9 < (CT1 - CT4) / (CT8 - CT5) < 2, where CT1 is the central thickness of the first lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, CT8 is the central thickness of the eighth lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis. The optical imaging lens group satisfying 0.9 < (CT1 - CT4) / (CT8 - CT5) < 2 can better realize the conjugate characteristics of the double-Gauss structure of the first lens group and the second lens group, which is beneficial to balancing the aberrations of the optical imaging lens group. More specifically, CT1, CT4, CT8, and CT5 may satisfy 0.9 < (CT1 - CT4) / (CT8 - CT5) < 1.8.

[0071] In an exemplary embodiment, the optical imaging lens group may satisfy 1 < CT1 / CT8 < 2, where CT1 is the central thickness of the first lens on the optical axis, and CT8 is the central thickness of the eighth lens on the optical axis. The optical imaging lens group satisfying 1 < CT1 / CT8 < 2 is beneficial to reasonably regulating the distortion amount of the optical imaging lens group, thereby limiting the distortion of the optical imaging lens group within a reasonable range. At the same time, it can also better realize the conjugate characteristics of the double-Gauss structure of the first lens group and the second lens group, which is beneficial to balancing the aberrations of the optical imaging lens group. More specifically, CT1 and CT8 may satisfy 1 < CT1 / CT8 < 1.8.

[0072] In an exemplary embodiment, the optical imaging lens group may satisfy -1.1 < SAG21 / SAG72 < -0.6, where SAG21 is the distance along the optical axis from the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens, and SAG72 is the distance along the optical axis from the intersection of the image side surface of the seventh lens and the optical axis to the vertex of the effective radius of the image side surface of the seventh lens. The optical imaging lens group satisfying -1.1 < SAG21 / SAG72 < -0.6 can better achieve the conjugate characteristics between the second lens and the seventh lens, better realize the overall double-Gauss conjugate structure, and is beneficial to balancing the aberration of the optical imaging lens group.

[0073] In an exemplary embodiment, the optical imaging lens group may satisfy -1 < SAG42 / SAG51 < -0.4, where SAG42 is the distance along the optical axis from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the effective radius of the image side surface of the fourth lens, and SAG51 is the distance along the optical axis from the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens. The optical imaging lens group satisfying -1 < SAG42 / SAG51 < -0.4 can better achieve the conjugate characteristics between the fourth lens and the fifth lens, better realize the overall double-Gauss conjugate structure, and is beneficial to balancing the aberration of the optical imaging lens group. More specifically, SAG42 and SAG51 may satisfy -0.8 < SAG42 / SAG51 < -0.5.

[0074] In an exemplary embodiment, the above optical imaging lens group may further include at least one aperture stop which can be set at an appropriate position as needed, for example, between the fourth lens and the fifth lens.

[0075] 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 the photosensitive element located on the imaging surface.

[0076] The optical imaging lens group according to the above embodiment of the present application may employ multiple lenses, such as the eight lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial spacing between each lens, etc., the volume of the optical imaging lens group can be effectively reduced, the sensitivity of the optical imaging lens group can be decreased, and the processability of the optical imaging lens group can be improved, making the optical imaging lens group more conducive to production and applicable to portable electronic products. The optical imaging lens group according to the embodiment of the present application also has at least one beneficial effect such as telephoto characteristics and high imaging quality.

[0077] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, 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 surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens to the eighth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens to the eighth lens are both aspherical mirror surfaces.

[0078] However, those skilled in the art will appreciate that, without departing from the technical solutions claimed in this application, the number of lenses comprising the optical imaging lens assembly can be varied to achieve the various results and advantages described herein. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens assembly is not limited to eight lenses. If desired, the optical imaging lens assembly can also include other numbers of lenses.

[0079] Specific embodiments of the optical imaging lens assembly applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0080] Example 1

[0081] The following reference Figures 1 to 2D The optical imaging lens assembly according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging lens assembly according to Example 1 of the present application is shown.

[0082] like Figure 1 As shown, the optical imaging lens group includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an aperture STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1, the second lens E2, the third lens E3, and the fourth lens E4 constitute a first lens group, while the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 constitute a second lens group. The first and second lens groups have a double-Gaussian conjugate symmetric structure.

[0083] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has positive focal power, with its object-side surface S15 being convex and its image-side surface S16 being 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. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0084] Table 1 shows the basic parameters of the optical imaging lens assembly of Example 1, wherein the units of the curvature radius, thickness and focal length are all millimeters (mm).

[0085]

[0086] Table 1

[0087] In Example 1, the total effective focal length f of the optical imaging lens assembly is 10.35 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S19 is 13.66 mm, half the diagonal length of the effective pixel area on the imaging surface S19 ImgH is 3.85 mm, and the maximum field of view FOV of the optical imaging lens assembly is 39.8°.

[0088] In Example 1, the object-side surface and the image-side surface of any lens from the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0089]

[0090] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient for the i-th order of the aspheric surface. Table 2 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface S1 to S16 in Example 1.

[0091]

[0092]

[0093] Table 2

[0094] Figure 2A The axial chromatic aberration curve of the optical imaging lens assembly of Example 1 is shown, which represents the deviation of the convergent focus of light of different wavelengths after passing through the optical imaging lens assembly. Figure 2B The astigmatism curve of the optical imaging lens group of Example 1 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 2C The distortion curve of the optical imaging lens assembly of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2D The chromatic aberration curve of the optical imaging lens group of Example 1 is shown, which represents the deviation of different image heights of light on the imaging surface through the optical imaging lens group. Figures 2A to 2D It can be seen that the optical imaging lens assembly provided in Example 1 can achieve good imaging quality.

[0095] Example 2

[0096] The following reference Figures 3 to 4D The optical imaging lens assembly according to Example 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Example 1 will be omitted. Figure 3 A schematic structural diagram of an optical imaging lens assembly according to Example 2 of the present application is shown.

[0097] like Figure 3 As shown, the optical imaging lens group includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an aperture STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1, the second lens E2, the third lens E3, and the fourth lens E4 constitute a first lens group, while the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 constitute a second lens group. The first and second lens groups have a double-Gaussian conjugate symmetric structure.

[0098] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has positive focal power, with its object-side surface S15 being convex and its image-side surface S16 being 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. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0099] In Example 2, the total effective focal length f of the optical imaging lens assembly is 10.29 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S19 is 12.83 mm, half the diagonal length of the effective pixel area on the imaging surface S19 ImgH is 3.85 mm, and the maximum field of view FOV of the optical imaging lens assembly is 39.7°.

[0100] Table 3 shows the basic parameters of the optical imaging lens assembly of Example 2, where the units of curvature radius, thickness, and focal length are all in millimeters (mm). Table 4 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 2, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0101]

[0102]

[0103] Table 3

[0104] 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

[0105] Table 4

[0106] Figure 4A The axial chromatic aberration curve of the optical imaging lens assembly of Example 2 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the optical imaging lens assembly. Figure 4B The astigmatism curve of the optical imaging lens group of Example 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 4C The distortion curve of the optical imaging lens assembly of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4DThe chromatic aberration curve of the optical imaging lens group of Example 2 is shown, which represents the deviation of different image heights of light on the imaging surface through the optical imaging lens group. Figures 4A to 4D It can be seen that the optical imaging lens assembly provided in Example 2 can achieve good imaging quality.

[0107] Example 3

[0108] The following reference Figures 5 to 6D Describe the optical imaging lens assembly according to Example 3 of the present application. Figure 5 A structural schematic diagram of an optical imaging lens assembly according to Example 3 of the present application is shown.

[0109] like Figure 5 As shown, the optical imaging lens group includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an aperture STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1, the second lens E2, the third lens E3, and the fourth lens E4 constitute a first lens group, while the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 constitute a second lens group. The first and second lens groups have a double-Gaussian conjugate symmetric structure.

[0110] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has positive focal power, with its object-side surface S15 being convex and its image-side surface S16 being 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. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0111] In Example 3, the total effective focal length f of the optical imaging lens assembly is 10.12 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S19 is 12.50 mm, half the diagonal length of the effective pixel area on the imaging surface S19 ImgH is 3.85 mm, and the maximum field of view FOV of the optical imaging lens assembly is 39.7°.

[0112] Table 5 shows the basic parameters of the optical imaging lens assembly of Example 3, where the units of curvature radius, thickness, and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 3, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0113]

[0114] Table 5

[0115]

[0116]

[0117] Table 6

[0118] Figure 6A The axial chromatic aberration curve of the optical imaging lens assembly of Example 3 is shown, which represents the deviation of the convergent focus of light of different wavelengths after passing through the optical imaging lens assembly. Figure 6B The astigmatism curve of the optical imaging lens group of Example 3 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 6C The distortion curve of the optical imaging lens assembly of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6D The chromatic aberration curve of the optical imaging lens group of Example 3 is shown, which represents the deviation of different image heights of light on the imaging surface through the optical imaging lens group. 6A to 6D It can be seen that the optical imaging lens assembly provided in Example 3 can achieve good imaging quality.

[0119] Example 4

[0120] The following reference Figures 7 to 8D Describe the optical imaging lens group according to Example 4 of the present application. Figure 7 A schematic structural diagram of an optical imaging lens assembly according to Example 4 of the present application is shown.

[0121] like Figure 7 As shown, the optical imaging lens group includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an aperture STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1, the second lens E2, the third lens E3, and the fourth lens E4 constitute a first lens group, while the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 constitute a second lens group. The first and second lens groups have a double-Gaussian conjugate symmetric structure.

[0122] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has positive focal power, with its object-side surface S15 being concave and its image-side surface S16 being 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. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0123] In Example 4, the total effective focal length f of the optical imaging lens assembly is 10.05 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S19 is 12.68 mm, half the diagonal length of the effective pixel area on the imaging surface S19 ImgH is 3.85 mm, and the maximum field of view FOV of the optical imaging lens assembly is 40.1°.

[0124] Table 7 shows the basic parameters of the optical imaging lens assembly of Example 4, where the units of curvature radius, thickness, and focal length are all in millimeters (mm). Table 8 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 4, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0125]

[0126]

[0127] Table 7

[0128] 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

[0129] Table 8

[0130] Figure 8A The axial chromatic aberration curve of the optical imaging lens assembly of Example 4 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the optical imaging lens assembly. Figure 8B The astigmatism curve of the optical imaging lens group of Example 4 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 8C The distortion curve of the optical imaging lens assembly of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8DThe chromatic aberration curve of the optical imaging lens group of Example 4 is shown, which represents the deviation of different image heights of light on the imaging surface through the optical imaging lens group. Figures 8A to 8D It can be seen that the optical imaging lens assembly provided in Example 4 can achieve good imaging quality.

[0131] Example 5

[0132] The following reference Figures 9 to 10D Describe the optical imaging lens assembly according to Example 5 of the present application. Figure 9 A schematic structural diagram of an optical imaging lens assembly according to Example 5 of the present application is shown.

[0133] like Figure 9 As shown, the optical imaging lens group includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an aperture STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a filter E9. The first lens E1, the second lens E2, the third lens E3, and the fourth lens E4 constitute a first lens group, while the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 constitute a second lens group. The first and second lens groups have a double-Gaussian conjugate symmetric structure.

[0134] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive focal power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has positive focal power, with its object-side surface S15 being concave and its image-side surface S16 being 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. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0135] In Example 5, the total effective focal length f of the optical imaging lens assembly is 10.12 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S19 is 12.23 mm, half the diagonal length of the effective pixel area on the imaging surface S19 ImgH is 3.85 mm, and the maximum field of view FOV of the optical imaging lens assembly is 39.7°.

[0136] Table 9 shows the basic parameters of the optical imaging lens assembly of Example 5, where the units of curvature radius, thickness, and focal length are all in millimeters (mm). Table 10 shows the high-order coefficients of each aspheric mirror surface that can be used in Example 5, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0137]

[0138] Table 9

[0139] 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

[0140] Table 10

[0141] Figure 10A The axial chromatic aberration curve of the optical imaging lens assembly of Example 5 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the optical imaging lens assembly. Figure 10B The astigmatism curve of the optical imaging lens group of Example 5 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 10C The distortion curve of the optical imaging lens assembly of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 10D The chromatic aberration curve of the optical imaging lens group of Example 5 is shown, which represents the deviation of different image heights of light on the imaging surface through the optical imaging lens group. 10A to 10D It can be seen that the optical imaging lens assembly provided in Example 5 can achieve good imaging quality.

[0142] In summary, Examples 1 to 5 respectively satisfy the relationships shown in Table 11.

[0143] Conditional formula\Example 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

[0144] Table 11

[0145] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone imaging device such as a digital camera, or an imaging module integrated into an electronic device such as a smartphone. The imaging device is equipped with the optical imaging lens assembly described above.

[0146] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of protection provided in this application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of this application. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens assembly, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has positive refractive power, its object-side surface is convex and its image-side surface is concave; a second lens having positive refractive power, with a convex object-side surface and a concave image-side surface; a third lens having optical power, the object-side surface of which is convex and the image-side surface of which is concave; a fourth lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave; a fifth lens having optical power, which is a meniscus lens with a concave object-side surface and a convex image-side surface; a sixth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is convex; a seventh lens element having positive optical power, whose object-side surface is concave and whose image-side surface is convex; and an eighth lens element having positive refractive power and a convex image-side surface; Wherein, the third lens has positive optical power; or, the third lens and the fifth lens both have negative optical power; The number of lenses with optical power in the optical imaging lens group is eight; 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 the following: 0.87≤(f1+f2) / (f7+f8)≤1.15; A center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy the following: 0.8<(CT1+CT2) / (CT7+CT8)≤1.

10.

2. The optical imaging lens assembly according to claim 1, wherein: Half of the diagonal length ImgH of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens group and the maximum field of view FOV of the optical imaging lens group satisfy the following conditions: 10.56 mm≤ImgH / tan(FOV / 2)≤10.66 mm.

3. The optical imaging lens assembly according to claim 1, wherein: A distance T45 between the fourth lens and the fifth lens on the optical axis and a distance TD between the object-side surface of the first lens and the image-side surface of the eighth lens on the optical axis satisfy the following conditions: 0.15<T45 / TD≤0.

21.

4. The optical imaging lens assembly according to claim 1, wherein: A distance Tr1r8 between the object side surface of the first lens and the image side surface of the fourth lens on the optical axis and a distance Tr9r16 between the object side surface of the fifth lens and the image side surface of the eighth lens on the optical axis satisfy: 0.89≤Tr1r8 / Tr9r16≤1.

12.

5. The optical imaging lens assembly according to claim 1, wherein: A curvature radius R8 of the image-side surface of the fourth lens and a curvature radius R9 of the object-side surface of the fifth lens satisfy: -1.10≤R8 / R9<-1.

6. The optical imaging lens assembly according to claim 1, wherein: The effective semi-aperture DT11 of the object-side surface of the first lens, the effective semi-aperture DT42 of the image-side surface of the fourth lens, the effective semi-aperture DT82 of the image-side surface of the eighth lens, and the effective semi-aperture DT51 of the object-side surface of the fifth lens satisfy the following: 0.92≤(DT11-DT42) / (DT82-DT51)<1.

2.

7. The optical imaging lens assembly 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 the following: 1.00≤CT5 / CT6<1.

1.

8. The optical imaging lens assembly according to claim 1, wherein: A distance BFL between the image side surface of the eighth lens and the imaging surface of the optical imaging lens group on the optical axis and a distance TTL between the object side surface of the first lens and the imaging surface on the optical axis satisfy the following conditions: 0.38≤BFL / TTL≤0.

43.

9. The optical imaging lens assembly according to claim 1, wherein: A curvature radius R3 of the object-side surface of the second lens and a curvature radius R14 of the image-side surface of the seventh lens satisfy: -1.00≤R3 / R14≤-0.8, or R3 / R14=-0.

79.

10. The optical imaging lens assembly according to claim 1, wherein: A center thickness CT7 of the seventh lens on the optical axis and a center thickness CT8 of the eighth lens on the optical axis satisfy the following: 0.96≤CT7 / CT8≤2.

54.

11. The optical imaging lens assembly according to claim 1, wherein: A distance T78 between the seventh lens and the eighth lens on the optical axis and a 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 the following conditions: 0.37≤10×T78 / Tr13r16≤0.

53.

12. The optical imaging lens assembly according to claim 1, wherein: A center thickness CT1 of the first lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT8 of the eighth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy the following: 0.99≤(CT1-CT4) / (CT8-CT5)≤1.

74.

13. The optical imaging lens assembly according to claim 1, wherein: A center thickness CT1 of the first lens on the optical axis and a center thickness CT8 of the eighth lens on the optical axis satisfy the following: 1< CT1 / CT8 < 1.

8.

14. The optical imaging lens assembly according to claim 1, wherein: The distance SAG21 between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens on the optical axis and the distance SAG72 between the intersection of the image side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image side surface of the seventh lens on the optical axis satisfy: -1.05≤SAG21 / SAG72≤-0.

65.

15. The optical imaging lens assembly according to claim 1, wherein: The distance SAG42 between the intersection of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens on the optical axis and the distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens on the optical axis satisfy: -0.68≤SAG42 / SAG51<-0.5.

Images