Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens cone, eight lenses arranged in the lens cone, a fifth spacing element and a sixth spacing element. The optical imaging lens is as follows: tan (FOV) / Fno is more than or equal to 5.26 and less than or equal to 7.93; the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens meet the following condition:-1.16 < = R10 / R12 < = 0.47; the inner diameter d5m of the image side surface of the fifth spacing element, the inner diameter d6s of the object side surface of the sixth spacing element and the spacing distance EP56 between the image side surface of the fifth spacing element and the object side surface of the sixth spacing element in the optical axis direction meet the condition that (d5m + d6s) / EP56 is greater than or equal to 0.27 and less than or equal to 0.81. The problem that in the prior art, an optical imaging lens affects relative illumination in order to meet the requirement for stable light path trend is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical imaging lens. Background Art

[0002] When designing an optical imaging lens, it is crucial to ensure the uniformity of the image, which directly affects the visual effect of the image and the accurate communication of information. Relative illumination, that is, the ratio of the brightness of the edge and the center of the imaging surface, is one of the key indicators for measuring imaging uniformity. In the design of optical imaging lenses, the radius of curvature of the lens has a direct impact on the refraction path and energy distribution of light. Especially for edge light, their paths are more complicated, and it is easy to produce path deviation and energy loss due to inappropriate lens shape.

[0003] In particular, the shape and curvature radius of the lens located in the middle are crucial to the entire optical path. However, in order to ensure a smooth optical path, there are usually more constraints on the shape and curvature radius of the lens located in the middle, which results in a limited design freedom angle for the lens located in the middle, which can easily affect the relative illumination of the optical imaging lens.

[0004] That is to say, in the prior art, the optical imaging lens has the problem of affecting the relative illumination in order to satisfy the requirement of smooth light path. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem in the prior art that the relative illumination is affected in order to ensure a smooth light path.

[0006] To achieve the above-mentioned object, according to one aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group and a spacer element group arranged in the lens barrel, the lens group consisting of eight lenses, the lens group comprising 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 arranged in sequence from the object side to the image side along the optical axis, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, the fourth lens has negative optical power, the image side surface of the fifth lens is a convex surface, and the image side surface of the eighth lens is a concave surface; the spacer element group comprises at least a fifth spacer element and a sixth spacer element, the fifth spacer element is located on the fifth lens The sixth spacing element is located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens; the maximum field angle FOV of the optical imaging lens and the aperture number Fno of the optical imaging lens satisfy: 5.26≤tan(FOV) / Fno≤7.93; the radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -1.16≤R10 / R12≤0.47; the inner diameter d5m of the image side surface of the fifth spacing element, the inner diameter d6s of the object side surface of the sixth spacing element, and the spacing distance EP56 between the image side surface of the fifth spacing element and the object side surface of the sixth spacing element in the optical axis direction satisfy: 0.27≤(d5m+d6s) / EP56≤0.81.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, and a lens group and a spacer element group arranged in the lens barrel, wherein the lens group consists of eight lenses, and the lens group includes 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 arranged in sequence from the object side to the image side along the optical axis, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface, the fourth lens has negative optical power, the image side surface of the fifth lens is a convex surface, and the image side surface of the eighth lens is a concave surface. concave surface; the spacer element group includes at least a fifth spacer element, the fifth spacer element is located between the fifth lens and the sixth lens and contacts with the image side surface portion of the fifth lens; the maximum field of view FOV of the optical imaging lens and the aperture number Fno of the optical imaging lens satisfy: 5.26≤tan(FOV) / Fno≤7.93; the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -1.16≤R10 / R12≤0.47; the inner diameter d5m of the image side surface of the fifth spacer element and the curvature radius R11 of the object side surface of the sixth lens satisfy: -0.49≤d5m / R11≤1.14.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, and a lens group and a spacer element group arranged in the lens barrel, wherein the lens group is composed of eight lenses, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side along the optical axis, wherein the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the second lens has negative optical power, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, the fourth lens has negative optical power, the image side surface of the fourth lens is a concave surface, and the fifth lens has negative optical power. The lens has positive focal power; the spacer element group includes at least a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts with the image side surface of the second lens, and the third spacer element is located between the third lens and the fourth lens and contacts with the image side surface of the third lens; the spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction, the air spacing T23 between the second lens and the third lens on the optical axis, and the air spacing T34 between the third lens and the fourth lens on the optical axis satisfy: 3.58≤EP23 / (T23+T34) ≤6.80; the curvature radius R8 of the image side surface of the fourth lens, the refractive index N4 of the fourth lens, and the inner diameter d3m of the image side surface of the third spacer element satisfy: 2.11≤R8×N4 / d3m≤3.25.

[0009] Further, an inner diameter d5m of the image-side surface of the fifth spacing element and a curvature radius R11 of the object-side surface of the sixth lens satisfy: -0.49≤d5m / R11≤1.14.

[0010] Further, an inner diameter d6s of the object side surface of the sixth spacer element, an inner diameter d5m of the image side surface of the fifth spacer element, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 0.61≤(d6s-d5m) / CT6≤2.84.

[0011] Further, a spacing distance EP56 between the image side surface of the fifth spacing element and the object side surface of the sixth spacing element in the optical axis direction and a center thickness CT6 of the sixth lens on the optical axis satisfy: 1.66≤EP56 / CT6≤3.53.

[0012] Further, the maximum height L of the lens barrel, the center thickness CT8 of the eighth lens on the optical axis, and the air interval T78 between the seventh lens and the eighth lens on the optical axis satisfy: 6.12≤L / (CT8+T78)≤12.22.

[0013] Furthermore, the fifth lens has positive optical power, the spacer element group also includes a fourth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens, and the effective focal length f5 of the fifth lens, the spacing distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element in the optical axis direction, and the center thickness CT5 of the fifth lens on the optical axis satisfy: 2.50≤f5 / (EP45+CT5)≤9.01.

[0014] Furthermore, the image side surface of the fourth lens is a concave surface, the spacer element group also includes a fourth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and is in partial contact with the image side surface of the fourth lens, and an outer diameter D4s of the object side surface of the fourth spacer element and a curvature radius R8 of the image side surface of the fourth lens satisfy: 0.83≤D4s / R8≤1.58.

[0015] Furthermore, the spacer element group also includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image side portion of the third lens, and the inner diameter d3s of the object side of the third spacer element and the center thickness CT3 of the third lens on the optical axis satisfy: 6.57≤d3s / CT3≤7.61.

[0016] Furthermore, the spacer element group also includes a third spacer element and a fourth spacer element. The third spacer element is located between the third lens and the fourth lens and contacts the image side portion of the third lens. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side portion of the fourth lens. The outer diameter D4m of the image side portion of the fourth spacer element, the outer diameter D3s of the object side portion of the third spacer element, and the spacing distance EP34 between the image side portion of the third spacer element and the object side portion of the fourth spacer element in the optical axis direction satisfy: 0.32≤(D4m-D3s) / EP34≤2.73.

[0017] Further, the second lens has negative optical power, the third lens has positive optical power, and the spacer element group also includes a first spacer element, a second spacer element, and a third spacer element. The first spacer element is located between the first lens and the second lens and contacts with the image side surface of the first lens, the second spacer element is located between the second lens and the third lens and contacts with the image side surface of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts with the image side surface of the third lens, and the combined focal length f23 of the second lens and the third lens, the spacing distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis direction, and the spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction satisfy: 3.57≤f23 / (EP12+EP23)≤10.68.

[0018] Furthermore, the spacer element group also includes a first spacer element, which is located between the first lens and the second lens and contacts the image side surface of the first lens, and the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d1s of the object side surface of the first spacer element satisfy: 0.28≤(D0s-d0s) / d1s≤0.84.

[0019] Furthermore, the first lens has positive optical power, and the spacer element group also includes a first spacer element, which is located between the first lens and the second lens and contacts the image side portion of the first lens, and the effective focal length f1 of the first lens, and the spacing distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer element in the optical axis direction satisfy: 10.02≤f1 / EP01≤25.69.

[0020] Furthermore, the spacer element group also includes a seventh spacer element, which is located between the seventh lens and the eighth lens and contacts the image side portion of the seventh lens, and the maximum height L of the lens barrel, the sum of the spacing distances ∑EP between the object side end face of the lens barrel and any two adjacent optical elements in the spacer element group on the optical axis, and the spacing distance EP67 between the image side face of the sixth spacer element and the object side face of the seventh spacer element in the optical axis direction satisfy: 2.06≤(L-∑EP) / EP67≤3.44.

[0021] Further, the object side surface of the eighth lens is a concave surface, the spacer element group also includes an eighth spacer element, the eighth spacer element is located on the image side of the image side surface of the eighth lens, and the eighth spacer element is in partial contact with the image side surface of the eighth lens, and the inner diameter d8s of the object side surface of the eighth spacer element and the curvature radius R15 of the object side surface of the eighth lens satisfy: -0.95≤d8s / R15≤-0.41.

[0022] Further, the eighth lens has negative optical power, the spacer element group also includes an eighth spacer element, the eighth spacer element is located on the image side of the image side surface of the eighth lens, and the eighth spacer element is in partial contact with the image side surface of the eighth lens, and the inner diameter d8s of the object side surface of the eighth spacer element and the combined focal length f78 of the seventh lens and the eighth lens satisfy: -1.74≤d8s / f78≤-0.53.

[0023] According to the technical solution of the present invention, the optical imaging lens comprises a lens barrel, a lens group and a spacer element group arranged in the lens barrel, the lens group comprises eight lenses, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens arranged in sequence from the object side to the image side along the optical axis, the image side surface of the fifth lens is a convex surface; the spacer element group comprises at least a fifth spacer element and a sixth spacer element, the fifth spacer element is located between the fifth lens and the sixth lens and is in partial contact with the image side surface of the fifth lens, the sixth spacer element is located between the sixth lens and the seventh lens and is in partial contact with the image side surface of the sixth lens ; The maximum field angle FOV of the optical imaging lens and the aperture number Fno of the optical imaging lens satisfy: 5.26≤tan(FOV) / Fno≤7.93; The radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -1.16≤R10 / R12≤0.47; The inner diameter d5m of the image side surface of the fifth spacer element, the inner diameter d6s of the object side surface of the sixth spacer element, and the spacing distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element in the optical axis direction satisfy: 0.27≤(d5m+d6s) / EP56≤0.81.

[0024] The optical imaging lens is composed of a lens barrel, eight lenses and at least one spacer element, and the maximum field angle FOV of the optical imaging lens and the aperture number Fno of the optical imaging lens satisfy: 5.26≤tan(FOV) / Fno≤7.93, which constrains the relationship between the maximum field angle and the aperture number of the optical imaging lens, so that the optical imaging lens has the performance of a small aperture, ensuring the light transmittance of the optical imaging lens, which increases the angle between the edge light and the center light, guides more light into the system, increases the energy loss of the edge light, and causes the brightness of the image edge to be much lower than the center, resulting in relative uneven illumination. At the same time, when the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -1.16≤R10 / R12≤0.47, the curvature radius of the image side surface of the fifth lens is close to the curvature radius of the image side surface of the sixth lens, which can ensure that the light smoothly transitions to the rear optical system, but this will affect the design freedom of the fifth lens and the sixth lens, limit the shape adjustment space of the fifth lens and the sixth lens, and cannot effectively compensate for the path deviation of the edge light, further increasing the problem of uneven relative illumination. In order to reduce the problem of uneven relative illumination, the present application constrains (d5m+d6s) / EP56 within a reasonable range, which can effectively reduce the occlusion and scattering of light when passing through the fifth spacing element and the sixth spacing element, optimize the propagation path of light, reduce the loss of edge light, and help improve the brightness of the image edge, thereby effectively improving the relative illumination performance of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 A dimensioning diagram of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0027] Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1-1 of the present invention is shown;

[0028] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 1-2 of the present invention is shown;

[0029] Figure 4 A schematic structural diagram of an optical imaging lens according to Embodiments 1 to 3 of the present invention is shown;

[0030] Figure 5 A magnification chromatic aberration curve diagram of the optical imaging lens according to the first embodiment of the present invention is shown;

[0031] Figure 6shows an axial chromatic aberration curve of the optical imaging lens according to the first embodiment of the present invention;

[0032] Figure 7 shows an astigmatism curve diagram of the optical imaging lens according to the first embodiment of the present invention;

[0033] Figure 8 shows a distortion curve diagram of the optical imaging lens according to the first embodiment of the present invention;

[0034] Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 2-1 of the present invention is shown;

[0035] Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 2-2 of the present invention is shown;

[0036] Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 2-3 of the present invention is shown;

[0037] Fig.12 A magnification chromatic aberration curve diagram of the optical imaging lens of the second embodiment of the present invention is shown;

[0038] Fig.13 shows an axial chromatic aberration curve of the optical imaging lens according to the second embodiment of the present invention;

[0039] Fig.14 shows an astigmatism curve diagram of the optical imaging lens according to the second embodiment of the present invention;

[0040] Fig.15 shows a distortion curve diagram of the optical imaging lens according to the second embodiment of the present invention;

[0041] Fig.16 A schematic structural diagram of an optical imaging lens according to Embodiment 3-1 of the present invention is shown;

[0042] Fig.17 A schematic structural diagram of an optical imaging lens according to Embodiment 3-2 of the present invention is shown;

[0043] Fig.18 A schematic structural diagram of an optical imaging lens according to Embodiment 3-3 of the present invention is shown;

[0044] Fig.19 A magnification chromatic aberration curve diagram of the optical imaging lens of the third embodiment of the present invention is shown;

[0045] Fig. 20 shows an axial chromatic aberration curve of the optical imaging lens of the third embodiment of the present invention;

[0046] Fig.21shows an astigmatism curve diagram of the optical imaging lens of the third embodiment of the present invention;

[0047] Fig. 22 shows a distortion curve diagram of the optical imaging lens according to the third embodiment of the present invention; Fig.23 A relative illumination curve diagram of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0048] Fig.24 A relative illumination curve diagram of an optical imaging lens according to another optional embodiment of the present invention is shown;

[0049] Fig.25 A relative illumination curve diagram of an optical lens in an example is shown;

[0050] Fig.26 A relative illumination curve diagram of an optical imaging lens in another example is shown.

[0051] The above drawings include the following reference numerals:

[0052] E1, first lens; P1, first spacing element; E2, second lens; P2, second spacing element; E3, third lens; P3, third spacing element; E4, fourth lens; P4, fourth spacing element; E5, fifth lens; P5, fifth spacing element; E6, sixth lens; P6, sixth spacing element; E7, seventh lens; P7, seventh spacing element; E8, eighth lens; P8, eighth spacing element; S1, object side surface of the first lens; S2, image side surface of the first lens; S3, The object side surface of the second lens; S4, the image side surface of the second lens; S5, the object side surface of the third lens; S6, the image side surface of the third lens; S7, the object side surface of the fourth lens; S8, the image side surface of the fourth lens; S9, the object side surface of the fifth lens; S10, the image side surface of the fifth lens; S11, the object side surface of the sixth lens; S12, the image side surface of the sixth lens; S13, the object side surface of the seventh lens; S14, the image side surface of the seventh lens; S15, the object side surface of the eighth lens; S16, the image side surface of the eighth lens. DETAILED DESCRIPTION

[0053] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0055] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0056] It should be noted that in this 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 features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0057] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0058] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In this application, the left side is the object side and the right side is the image side.

[0059] In order to solve the problem in the prior art that the relative illumination is affected in order to ensure a smooth light path of an optical imaging lens, the present invention provides an optical imaging lens.

[0060] like Figures 1 to 22As shown, the optical imaging lens comprises a lens barrel, a lens group and a spacer element group arranged in the lens barrel, the lens group consists of eight lenses, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side along the optical axis, and the image side surface of the fifth lens is a convex surface; the spacer element group comprises at least a fifth spacer element and a sixth spacer element, the fifth spacer element is located between the fifth lens and the sixth lens and is in partial contact with the image side surface of the fifth lens, and the sixth spacer element is located between the sixth lens and the seventh lens and is in partial contact with the image side surface of the sixth lens; the optical imaging lens comprises a lens barrel, a lens group and a spacer element group, the lens group comprises eight lenses, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side along the optical axis, and the image side surface of the fifth lens is a convex surface; the spacer element group comprises at least a fifth spacer element and a sixth spacer element, the fifth spacer element is located between the fifth lens and the sixth lens and is in partial contact with the image side surface of the fifth lens, and the sixth spacer element is located between the sixth lens and the seventh lens and is in partial contact with the image side surface of the sixth lens; The maximum field angle FOV of the imaging lens and the aperture number Fno of the optical imaging lens satisfy: 5.26≤tan(FOV) / Fno≤7.93; the radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -1.16≤R10 / R12≤0.47; the inner diameter d5m of the image side surface of the fifth spacer element, the inner diameter d6s of the object side surface of the sixth spacer element, and the spacing distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element in the optical axis direction satisfy: 0.27≤(d5m+d6s) / EP56≤0.81.

[0061] The optical imaging lens of the present application is composed of a lens barrel, eight lenses and at least one spacer element, and when the maximum field angle FOV of the optical imaging lens and the aperture number Fno of the optical imaging lens satisfy the following relationship: 5.26≤tan(FOV) / Fno≤7.93, the relationship between the maximum field angle and the aperture number of the optical imaging lens is constrained, so that the optical imaging lens has the performance of a small aperture, and the light transmittance of the optical imaging lens is guaranteed, which leads to an increase in the angle between the edge light and the center light, guides more light into the system, increases the energy loss of the edge light, and causes the brightness of the image edge to be much lower than the center, resulting in relative illumination unevenness. At the same time, when the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -1.16≤R10 / R12≤0.47, the curvature radius of the image side surface of the fifth lens is close to the curvature radius of the image side surface of the sixth lens, which can ensure that the light smoothly transitions to the rear optical system, but this will affect the design freedom of the fifth lens and the sixth lens, limit the shape adjustment space of the fifth lens and the sixth lens, and cannot effectively compensate for the path deviation of the edge light, further increasing the problem of uneven relative illumination. In order to reduce the problem of uneven relative illumination, the present application constrains (d5m+d6s) / EP56 within a reasonable range, which can effectively reduce the occlusion and scattering of light when passing through the fifth spacing element and the sixth spacing element, optimize the propagation path of light, reduce the loss of edge light, and help improve the brightness of the image edge, thereby effectively improving the relative illumination performance of the lens.

[0062] In addition, refer to Table 1 and Figure 23 to Figure 26 As shown, Fig.23 A relative illumination curve is shown when tan(FOV) / Fno=5.7, R10 / R12= -0.52, (d5m+d6s) / EP56=0.29 is satisfied, wherein the abscissa is the half field of view angle and the ordinate is the relative illumination. Fig.24 The relative illumination curve is shown when tan(FOV) / Fno=5.7, R10 / R12= -0.52, (d5m+d6s) / EP56=0.73. Fig.23 and Fig.24 It can be seen that when the optical imaging lens satisfies 0.27≤(d5m+d6s) / EP56≤0.81, the sizes of the fifth spacer element and the sixth spacer element are reasonable, there is less blocking and scattering of light, the loss of edge light is small, and the relative illumination is good. Fig.25 The relative illumination curve is shown when tan(FOV) / Fno=5.7, R10 / R12= -0.52, (d5m+d6s) / EP56=0.12. Fig.25 It can be seen that when (d5m+d6s) / EP56 is less than 0.27, the distance between the fifth spacing element and the sixth spacing element in the optical axis direction is too long, and the light propagation path is too long, resulting in refraction loss and energy attenuation of the light during transmission, affecting the effective transmission of light flux. Fig.23 , Fig.24 and Fig.25 It can be seen that Fig.25 The relative illumination performance of the optical imaging lens shown is poor. Fig.26 The relative illumination curve is shown when tan(FOV) / Fno=5.7, R10 / R12= -0.52, (d5m+d6s) / EP56=0.94. When (d5m+d6s) / EP56 is greater than 0.81, the distance between the fifth and sixth spacing elements in the optical axis direction is short, and the light propagation path is too compact, resulting in light blocking or premature scattering, increasing energy loss. Fig.23 , Fig.24 and Fig.26 It can be seen that Fig.26 The relative illumination performance of the optical imaging lens shown is poor.

[0063] Table 1

[0064]

[0065] It should be noted that the present application limits (d5m+d6s) / EP56 within a reasonable range, constrains the inner diameter of the fifth spacing element and the sixth spacing element and the spacing distance between the fifth spacing element and the sixth spacing element, so as to ensure the propagation path of the edge light, reduce the energy loss caused by the blocking of the edge light and the refraction loss, energy attenuation, premature scattering, etc., effectively improve the energy of the edge light, improve the relative illumination of the optical imaging lens, and solve the relative illumination problem caused by tan(FOV) / Fno in the range of 5.26 to 7.93 and R10 / R12 in the range of -1.16 to 0.47. When (d5m+d6s) / EP56 meets the above range, the relative illumination of the optical imaging lens can be improved, and it does not depend on the optical focal length and surface shape of other lenses. The optical focal length and surface shape of other lenses are further optimization of the optical imaging lens on this basis. The other lenses can be positive or negative according to the actual design requirements of the optical system, and the surface shape of each lens can be convex or concave according to the design requirements of the optical system. The optical system can have good relative illumination performance when it meets: 5.26≤tan(FOV) / Fno≤7.93; -1.16≤R10 / R12≤0.47; 0.27≤(d5m+d6s) / EP56≤0.81.

[0066] For example, in some optional embodiments, the first lens has a positive focal length, which can converge the light so that the large-angle light is deflected toward the optical axis to further increase the light intensity of the edge light. For another example, in some optional embodiments, the second lens has a negative focal length, which can balance the aberration caused by the first lens, which is conducive to further improving the imaging quality. For another example, in some optional embodiments, the third lens has a positive focal length, which properly converges the light so that the light smoothly transitions to the rear. For another example, in some optional embodiments, the fourth lens has a negative focal length, which balances the aberration caused by the front lens, improves the imaging quality, and properly diverges the light, which is conducive to the smooth transition of the light to the rear optical system. For another example, in some optional embodiments, the fifth lens has a positive focal length, which can properly converge the light to avoid serious light diffusion and mismatch with the chip. For another example, in some optional embodiments, the eighth lens has a negative focal length, which can balance the aberration caused by the front positive lens, improve the imaging quality, and properly diverge the light, which is conducive to the smooth transition of the light to the imaging surface. For another example, in some optional embodiments, the object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the second lens is concave, and the image side surface of the second lens is convex. The object side surface of the third lens is convex, and the image side surface of the third lens is concave. The image side surface of the fourth lens is concave. The image side surface of the fifth lens is convex. The object side surface of the eighth lens is concave, and the image side surface of the eighth lens is concave. By reasonably constraining the surface shape of each lens, it is beneficial to reasonably constrain the trend of light, ensure a smooth transition of light, and help correct aberrations. The optical imaging lens can be simulated by software and / or tools such as ZEMAX and CODEV. Preferably, the optical imaging lens can be simulated by CODEV. In the process of simulation using software and / or tools such as the above, the surface shape of each lens can be simulated and appropriately adjusted according to the surface shape of the software and / or tools used.

[0067] In some optional embodiments, the inner diameter d5m of the image side surface of the fifth spacer element and the curvature radius R11 of the object side surface of the sixth lens satisfy: -0.49≤d5m / R11≤1.14. By constraining d5m / R11 within a reasonable range, the range of light entering the sixth lens and the deflection angle of the light when passing through the object side surface of the sixth lens can be controlled, and then the focusing characteristics of the light in the sixth lens can be effectively adjusted to ensure the clarity and uniformity of the imaging of the optical imaging lens.

[0068] In some optional embodiments, the inner diameter d6s of the object side surface of the sixth spacer element, the inner diameter d5m of the image side surface of the fifth spacer element and the center thickness CT6 of the sixth lens on the optical axis satisfy: 0.61≤(d6s-d5m) / CT6≤2.84. By constraining (d6s-d5m) / CT6 within a reasonable range, the propagation path of light in the lens group can be optimized, especially by controlling the incident angle and beam width of the light from the fifth lens to the sixth lens, the light incident to the optical structure area of ​​the eighth lens and the stray light emitted from the optical structure area of ​​the sixth lens can be effectively intercepted, and by reasonably setting the relationship between the difference between d6s and d5m and CT6, the stray light can be effectively intercepted, and the refraction effect of the sixth lens can be controlled to ensure that the light is more evenly focused on the imaging surface.

[0069] In some optional embodiments, the spacing distance EP56 between the image side surface of the fifth spacing element and the object side surface of the sixth spacing element in the optical axis direction and the center thickness CT6 of the sixth lens on the optical axis satisfy: 1.66≤EP56 / CT6≤3.53. By constraining EP56 / CT6 within a reasonable range, it is helpful to adjust the deflection angle of light, reduce the sensitivity of the sixth lens, ensure that the optical imaging lens can maintain good imaging performance under different light conditions, and also help to improve the moldability of the sixth lens and the yield of the overall optical system.

[0070] In some optional embodiments, the maximum height L of the lens barrel, the center thickness CT8 of the eighth lens on the optical axis, and the air interval T78 between the seventh lens and the eighth lens on the optical axis satisfy: 6.12≤L / (CT8+T78)≤12.22. By constraining L / (CT8+T78) within a reasonable range, the accuracy of the propagation path and the focal point of the light in the lens group can be ensured, the aberration caused by improper refraction of light can be reduced, the uniformity of the imaging quality can be ensured, and in particular, the vignetting effect and other uneven lighting problems can be avoided, so that the optical imaging lens can maintain a good imaging effect even in a complex environment.

[0071] In some optional embodiments, the fifth lens has positive focal power, the spacer element group further includes a fourth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens, and the effective focal length f5 of the fifth lens, the spacing distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element in the optical axis direction, and the center thickness CT5 of the fifth lens on the optical axis satisfy: 2.50≤f5 / (EP45+CT5)≤9.01. By controlling the relationship among f5, EP45 and CT5, it can be ensured that the light is focused along the expected path after passing through the fifth lens, reducing defocus and aberration, ensuring the stability of the focus position and optical path of the fifth lens, and thus improving the clarity and quality of imaging.

[0072] In some optional embodiments, the image side surface of the fourth lens is a concave surface, the spacer element group further includes a fourth spacer element, the fourth spacer element is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens, and the outer diameter D4s of the object side surface of the fourth spacer element and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.83≤D4s / R8≤1.58. By controlling the range of D4s / R8, it is helpful to accurately adjust the refraction angle of light when passing through the fourth lens. This can ensure that after the light passes through the fourth lens, a light spot is formed on the imaging surface that is neither too concentrated nor too dispersed, thereby improving the uniformity and clarity of the imaging.

[0073] In some optional embodiments, the spacer element group further includes a third spacer element, which is located between the third lens and the fourth lens and partially contacts the image side surface of the third lens, and the inner diameter d3s of the object side surface of the third spacer element and the center thickness CT3 of the third lens on the optical axis satisfy: 6.57≤d3s / CT3≤7.61. By constraining d3s / CT3 within a reasonable range, the path of light passing through the third lens can be optimized, ensuring that the marginal light emitted from the third lens can pass through the third spacer element, reducing optical distortion, such as field curvature and distortion, thereby improving the clarity and accuracy of imaging and ensuring that the details of the image are accurately presented.

[0074] In some optional embodiments, the spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is located between the third lens and the fourth lens and partially contacts the image side surface of the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens, and the outer diameter D4m of the image side surface of the fourth spacer element, the outer diameter D3s of the object side surface of the third spacer element, and the spacing distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction satisfy: 0.32≤(D4m-D3s) / EP34≤2.73. By constraining (D4m-D3s) / EP34 within a reasonable range, the distribution of light in the edge field of view can be effectively managed, while intercepting edge stray light, optimizing the light distribution of the rear lens group, thereby improving the brightness uniformity and imaging quality of the edge area. At the same time, the spacing distance between the third spacer element and the fourth spacer element in the optical axis direction is constrained to ensure that there is enough space between the third spacer element and the fourth spacer element, thereby ensuring the stability of the optical imaging lens structure and the tolerance capability during the assembly process.

[0075] In some optional embodiments, the second lens has negative optical power, the third lens has positive optical power, and the spacer element group further includes a first spacer element, a second spacer element, and a third spacer element. The first spacer element is located between the first lens and the second lens and contacts with the image side portion of the first lens, the second spacer element is located between the second lens and the third lens and contacts with the image side portion of the second lens, the third spacer element is located between the third lens and the fourth lens and contacts with the image side portion of the third lens, and the combined focal length f23 of the second lens and the third lens, the spacing distance EP12 between the image side portion of the first spacer element and the object side portion of the second spacer element in the optical axis direction, and the spacing distance EP23 between the image side portion of the second spacer element and the object side portion of the third spacer element in the optical axis direction satisfy: 3.57≤f23 / (EP12+EP23)≤10.68. By constraining f23 / (EP12+EP23) within a reasonable range, it helps to adjust the optical axis alignment of the optical imaging lens, thereby reducing astigmatism and improving the overall contrast and clarity of the imaging. It can also constrain the combined focal length of the second lens and the third lens, which can optimize the light transmission path, thereby facilitating the adjustment of the depth of field and providing better visual effects.

[0076] In some optional embodiments, the spacer element group further includes a first spacer element, the first spacer element is located between the first lens and the second lens and partially contacts the image side surface of the first lens, and the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d1s of the object side surface of the first spacer element satisfy: 0.28≤(D0s-d0s) / d1s≤0.84. By constraining (D0s-d0s) / d1s within a reasonable range, it is ensured that the light entering from the front end of the lens can be smoothly transmitted, and the light blocking problem caused by the excessive thickness of the lens barrel wall is avoided. By reasonably controlling the ratio of the difference between D0s and d0s and the inner diameter d1s of the first spacer element, it is ensured that the spatial layout between the lens barrel and the first spacer element utilizes the light most efficiently, reduces the loss of edge light, and thus improves the relative illumination of the entire system.

[0077] In some optional embodiments, the first lens has positive focal power, the spacer element group further includes a first spacer element, the first spacer element is located between the first lens and the second lens and partially contacts the image side surface of the first lens, and the effective focal length f1 of the first lens, the spacing distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction satisfy: 10.02≤f1 / EP01≤25.69. By constraining f1 / EP01 within a reasonable range, the light entry efficiency at the front end of the lens barrel can be improved, and the mechanical shielding of light can be reduced, so that a sufficiently high light flux can be guaranteed even under low light conditions, making the image brighter and clearer.

[0078] In some optional embodiments, the spacer element group further includes a seventh spacer element, which is located between the seventh lens and the eighth lens and partially contacts the image side surface of the seventh lens, and the maximum height L of the lens barrel, the sum of the distances between the object side end surface of the lens barrel and any two adjacent optical elements in the spacer element group on the optical axis ∑EP, and the distance EP67 between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element in the optical axis direction satisfy: 2.06≤(L-∑EP) / EP67≤3.44. By controlling the ratio of (L - ∑EP) to EP67, it is helpful to adjust the propagation path of light in the entire optical system, maintain effective transmission of light, reduce loss, ensure uniformity of brightness distribution during imaging, and avoid contrast reduction or color distortion caused by light loss.

[0079] Among them, ∑EP= EP01+ EP12+ EP23+EP34+EP45+ EP56+EP67+ EP78, wherein EP01 is the spacing distance between the object side end face of the lens barrel and the object side face of the first spacing element in the direction of the optical axis, EP12 is the spacing distance between the image side face of the first spacing element and the object side face of the second spacing element in the direction of the optical axis, EP23 is the spacing distance between the image side face of the second spacing element and the object side face of the third spacing element in the direction of the optical axis, EP34 is the spacing distance between the image side face of the third spacing element and the object side face of the fourth spacing element in the direction of the optical axis, EP45 is the spacing distance between the image side face of the fourth spacing element and the object side face of the fifth spacing element in the direction of the optical axis, EP56 is the spacing distance between the image side face of the fifth spacing element and the object side face of the sixth spacing element in the direction of the optical axis, EP67 is the spacing distance between the image side face of the sixth spacing element and the object side face of the seventh spacing element in the direction of the optical axis, and EP78 is the spacing distance between the image side face of the seventh spacing element and the object side face of the eighth spacing element in the direction of the optical axis.

[0080] In some optional embodiments, the object side surface of the eighth lens is a concave surface, the spacer element group further includes an eighth spacer element, the eighth spacer element is located on the image side of the image side surface of the eighth lens, and the eighth spacer element is partially in contact with the image side surface of the eighth lens, and the inner diameter d8s of the object side surface of the eighth spacer element and the curvature radius R15 of the object side surface of the eighth lens satisfy: -0.95≤d8s / R15≤-0.41. By constraining d8s / R15 within a reasonable range, the refraction angle and propagation path of light passing through the eighth lens can be adjusted to avoid excessive concentration or divergence of light, thereby ensuring the uniformity of light distribution on the imaging surface, which is conducive to improving the uniformity and quality of imaging.

[0081] In some optional embodiments, the eighth lens has a negative focal power, the spacer element group further includes an eighth spacer element, the eighth spacer element is located on the image side of the image side of the eighth lens, and the eighth spacer element is partially in contact with the image side of the eighth lens, and the inner diameter d8s of the object side of the eighth spacer element and the combined focal length f78 of the seventh lens and the eighth lens satisfy: -1.74≤d8s / f78≤-0.53. By constraining d8s / f78 within a reasonable range, it is effectively ensured that the light is more concentrated when passing through the propagation path of the seventh lens and the eighth lens, avoiding excessive divergence of the light, effectively improving the utilization rate of the light in the optical system, avoiding the dark corner effect caused by over-focusing, ensuring high contrast and high quality of the image, and at the same time ensuring the range of the light passing through the spacer element of the eighth lens, further improving the uniformity of the light on the imaging surface, especially reducing the brightness difference between the central area and the edge part of the imaging surface.

[0082] In another optional embodiment, the optical imaging lens comprises a lens barrel, and a lens group and a spacer element group arranged in the lens barrel, the lens group consists of eight lenses, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side along the optical axis, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, the fourth lens has negative optical power, the image side surface of the fifth lens is a convex surface, and the image side surface of the eighth lens is a concave surface; The spacer element group includes at least a fifth spacer element, which is located between the fifth lens and the sixth lens and contacts with the image side surface of the fifth lens; the maximum field angle FOV of the optical imaging lens and the aperture number Fno of the optical imaging lens satisfy: 5.26≤tan(FOV) / Fno≤7.93; the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -1.16≤R10 / R12≤0.47; the inner diameter d5m of the image side surface of the fifth spacer element and the curvature radius R11 of the object side surface of the sixth lens satisfy: -0.49≤d5m / R11≤1.14.

[0083] The optical imaging lens of the present application is composed of a lens barrel, eight lenses and at least one spacer element, and when the maximum field angle FOV of the optical imaging lens and the aperture number Fno of the optical imaging lens satisfy the following relationship: 5.26≤tan(FOV) / Fno≤7.93, the relationship between the maximum field angle and the aperture number of the optical imaging lens is constrained, so that the optical imaging lens has the performance of a small aperture, and the light transmittance of the optical imaging lens is guaranteed, which leads to an increase in the angle between the edge light and the center light, guides more light into the system, increases the energy loss of the edge light, and causes the brightness of the image edge to be much lower than the center, resulting in relative illumination unevenness. At the same time, when the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy the following condition: -1.16≤R10 / R12≤0.47, the curvature radius of the image side surface of the fifth lens is close to the curvature radius of the image side surface of the sixth lens, which can ensure that the light smoothly transitions to the rear optical system. However, this will affect the design freedom of the fifth lens and the sixth lens, limit the shape adjustment space of the fifth lens and the sixth lens, and cannot effectively compensate for the path deviation of the edge light, further increasing the problem of uneven relative illumination. In order to reduce the problem of uneven relative illumination, the present application constrains d5m / R11 within a reasonable range, which can control the range of light entering the sixth lens and the deflection angle of the light when passing through the object side surface of the sixth lens, thereby effectively adjusting the focusing characteristics of the light in the sixth lens, ensuring the clarity and uniformity of the imaging of the optical imaging lens, and thus improving the problem of uneven relative illumination.

[0084] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0085] In another optional embodiment, the optical imaging lens comprises a lens barrel, and a lens group and a spacer element group arranged in the lens barrel, the lens group consists of eight lenses, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side to the image side along the optical axis, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the second lens has negative optical power, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, the third lens has positive optical power, the fourth lens has negative optical power, and the image side surface of the fourth lens is a concave surface, The fifth lens has positive focal power; the spacer element group includes at least a second spacer element and a third spacer element, the second spacer element is located between the second lens and the third lens and contacts with the image side surface of the second lens, and the third spacer element is located between the third lens and the fourth lens and contacts with the image side surface of the third lens; the spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction, the air spacing T23 between the second lens and the third lens on the optical axis, and the air spacing T34 between the third lens and the fourth lens on the optical axis satisfy: 3.58≤EP23 / (T23+T34) ≤6.80; the curvature radius R8 of the image side surface of the fourth lens, the refractive index N4 of the fourth lens, and the inner diameter d3m of the image side surface of the third spacer element satisfy: 2.11≤R8×N4 / d3m≤3.25.

[0086] The optical imaging lens of the present application is composed of a lens barrel, eight lenses and at least one spacer element, and the spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction, the air spacing T23 between the second lens and the third lens on the optical axis, and the air spacing T34 between the third lens and the fourth lens on the optical axis satisfy the following conditions: 3.58≤EP23 / (T23+T34)≤6.80. In order to ensure the assembly stability of the optical imaging lens at the position of the third lens, the air spacing between the second lens and the third lens and the air spacing between the third lens and the fourth lens are small. Due to space limitations, the design freedom of the third lens is small. When the light enters the rear optical system through the rapid convergence of the third lens, it is easy to form a large angle deflection and thus form stray light. The present application constrains R8×N4 / d3m within a reasonable range, which can constrain the height of the light entering the fourth lens, and at the same time constrain the deflection angle of the light when it is emitted from the image side surface of the fourth lens, which is conducive to controlling the light to be transmitted along a preset path, reducing the light entering the rear with a large angle deflection, thereby reducing the generation of stray light and improving the imaging quality.

[0087] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0088] Optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0089] It should be noted that each lens includes an optical effective diameter area located at the center and an optical structure area located at the edge, and the optical structure area is located on the outer peripheral side of the optical effective area and is arranged around the circumference of the optical effective area. The optical effective area is used for the passage of imaging light, while the optical structure area is not used for the passage of imaging light and is used to abut against the lens barrel or adjacent lenses or adjacent spacing elements. The optical structure area is also called a non-effective diameter area.

[0090] The optical imaging lens in the present application may use multiple lenses, such as the eight lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: 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 using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0091] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0092] Figure 1 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1 Parameters such as d1s, d3s, D3s, D4s, D4m, d5m, d6s, d8s, d0s, D0s, EP01, EP12, EP23, EP34, EP45, EP56, and EP67 are indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical imaging lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when the specific embodiments are described later.

[0093] The following further describes examples of specific surface shapes and parameters of the optical imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0094] It should be noted that in the following embodiment 1, there are embodiments 1-1, 1-2, and 1-3; in embodiment 2, there are embodiments 2-1, 2-2, and 2-3; in embodiment 3, there are embodiments 3-1, 3-2, and 3-3. In the same embodiment, the parameters such as the radius of curvature, center thickness, and spacing distances between lenses and high-order coefficients of the optical imaging lenses of the three embodiments are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element, the second spacing element, and the third spacing element, as well as the shapes of some lenses are different. In other words, the main structures for imaging are the same, but the auxiliary structures for imaging are different.

[0095] It should be noted that any of the following embodiments 1 to 3 are applicable to all implementation methods of the present application.

[0096] Embodiment 1

[0097] like Figures 2 to 8 As shown, the optical imaging lens of the first embodiment is described. Figure 2 FIG. 1 is a schematic diagram showing the structure of the optical imaging lens of Example 1-1. Figure 3 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-2 is shown, Figure 4 The schematic diagram of the structure of the optical imaging lens of Embodiment 1-3 is shown.

[0098] like Figures 2 to 4 As shown, the optical imaging lens includes a lens barrel, eight lenses and a plurality of spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8 and an eighth spacer element P8, which are arranged in sequence from the object side to the image side.

[0099] like Figure 2, which is a schematic diagram of the structure of the optical imaging lens of Example 1-1. In this example, the object side surface S1 of the first lens is in partial contact with the lens barrel. The object side surface and the image side surface of the first spacer element are in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element are in partial contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacer element are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, the object side surface and image side surface of the fourth spacer element are in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, the object side surface and image side surface of the fifth spacer element are in partial contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, the object side surface and image side surface of the sixth spacer element are in partial contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens respectively, the object side surface and image side surface of the seventh spacer element are in partial contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens respectively, and the image side surface S16 of the eighth lens is in partial contact with the object side surface of the eighth spacer element.

[0100] like Figure 3 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of Example 1-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0101] like Figure 4 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of Example 1-3. In this example, the abutting manner of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0102] In summary, the structural parameters of the optical imaging lens of Example 1 in Example 1-1, Example 1-2, and Example 1-3 are shown in Table 9.

[0103] In Embodiment 1, the first lens E1 has positive power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has negative power, the object side surface S7 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive power, the object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has negative power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has positive power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is convex. The eighth lens E8 has negative power, the object side surface S15 of the eighth lens is a concave surface, and the image side surface S16 of the eighth lens is a concave surface. Among them, S17 and S18 (not shown in the figure) in Table 2 can be the object side surface and image side surface of the filter or protection glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture, which is located on the first lens.

[0104] Table 2 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0105] Table 2

[0106]

[0107] In the first embodiment, the object-side surface and the image-side surface of the first lens E1 to the eighth lens E8 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0108] Formula (1)

[0109] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 1; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 3 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface S1-S16 in Example 1.

[0110] Table 3

[0111]

[0112] Figure 5 A magnification chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 6 The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 7 The astigmatism curve of the optical imaging lens of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8 A distortion curve diagram of the optical imaging lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different image heights.

[0113] according to Figures 5 to 8 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0114] Embodiment 2

[0115] like Figures 9 to 15 As shown, the optical imaging lens of the second embodiment is described. Fig. 9 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-1. Fig.10 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-2. Fig.11 A schematic structural diagram of the optical imaging lens of Example 2-3 is shown.

[0116] like Figures 9 to 11 As shown, the optical imaging lens includes a lens barrel, eight lenses and a plurality of spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8 and an eighth spacer element P8, which are arranged in sequence from the object side to the image side.

[0117] like Fig. 9, which is a schematic diagram of the structure of the optical imaging lens of Example 2-1. In this example, the object side surface S1 of the first lens is in partial contact with the lens barrel. The object side surface and the image side surface of the first spacer element are in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element are in partial contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacer element are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, the object side surface and image side surface of the fourth spacer element are in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, the object side surface and image side surface of the fifth spacer element are in partial contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, the object side surface and image side surface of the sixth spacer element are in partial contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens respectively, the object side surface and image side surface of the seventh spacer element are in partial contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens respectively, and the image side surface S16 of the eighth lens is in partial contact with the object side surface of the eighth spacer element.

[0118] like Fig.10 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0119] like Fig.11 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0120] In summary, the structural parameters of the optical imaging lens of Example 2 in Example 2-1, Example 2-2, and Example 2-3 are shown in Table 9.

[0121] In the second embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave. The eighth lens E8 has negative power, the object side surface S15 of the eighth lens is a concave surface, and the image side surface S16 of the eighth lens is a concave surface. Among them, S17 and S18 (not shown in the figure) in Table 4 can be the object side surface and image side surface of the filter or protection glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture, which is located on the first lens.

[0122] Table 4 shows a basic structural parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0123] Table 4

[0124]

[0125] Table 5 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1-S16 in Example 2. The surface shape of each aspherical surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0126] Table 5

[0127]

[0128] Fig.12 A magnification chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Fig.13 The axial chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.14 The astigmatism curve of the optical imaging lens of the second embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.15A distortion curve diagram of the optical imaging lens of Example 2 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights.

[0129] according to Figures 12 to 15 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0130] Embodiment 3

[0131] like Figures 16 to 22 As shown, the optical imaging lens of embodiment 3 is described. Fig.16 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-1. Fig.17 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-2. Fig.18 A schematic structural diagram of the optical imaging lens of Example 3-3 is shown.

[0132] like Figures 16 to 18 As shown, the optical imaging lens includes a lens barrel, eight lenses and a plurality of spacer elements. The lens barrel includes a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, an eighth lens E8 and an eighth spacer element P8, which are arranged in sequence from the object side to the image side.

[0133] like Fig.16 , which is a schematic diagram of the structure of the optical imaging lens of Example 3-1. In this example, the object side surface S1 of the first lens is in partial contact with the lens barrel. The object side surface and the image side surface of the first spacer element P1 are in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element are in partial contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacer element are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, the object side surface and image side surface of the fourth spacer element are in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, the object side surface and image side surface of the fifth spacer element are in partial contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, the object side surface and image side surface of the sixth spacer element are in partial contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens respectively, the object side surface and image side surface of the seventh spacer element are in partial contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens respectively, and the image side surface S16 of the eighth lens is in partial contact with the object side surface of the eighth spacer element.

[0134] like Fig.17FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0135] like Fig.18 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0136] In summary, the structural parameters of the optical imaging lens of Example 3 in Example 3-1, Example 3-2, and Example 3-3 are shown in Table 9.

[0137] In the third embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has negative focal power, the object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has positive focal power, the object side surface S13 of the seventh lens is convex, and the image side surface S14 of the seventh lens is convex. The eighth lens E8 has negative power, the object side surface S15 of the eighth lens is a concave surface, and the image side surface S16 of the eighth lens is a concave surface. Among them, S17 and S18 (not shown in the figure) in Table 2 can be the object side surface and image side surface of the filter or protection glass, S19 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object distance, and STO (not shown in the figure) is the aperture, which is located on the first lens.

[0138] Table 6 shows a basic structural parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0139] Table 6

[0140]

[0141] Table 7 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspheric mirror surfaces S1-S16 in Example 2. The surface shape of each aspheric surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0142] Table 7

[0143]

[0144] Fig.19 A magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Fig. 20 The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.21 The astigmatism curve of the optical imaging lens of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig. 22 A distortion curve diagram of the optical imaging lens of Example 3 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights.

[0145] according to Figures 19 to 22 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0146] In summary, the optical imaging lenses of Embodiments 1 to 3 respectively satisfy the relationship shown in Table 8.

[0147] Table 8

[0148]

[0149] Table 9 shows some parameters of the optical imaging lenses of Examples 1 to 3 (unit: mm, unit of FOV is °).

[0150] Table 9

[0151]

[0152] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0153] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0154] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0155] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0156] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: The invention comprises a lens barrel and a lens group and a spacer element group arranged in the lens barrel, The lens group is composed of eight lenses, and the lens group includes 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 arranged in sequence from the object side to the image side along the optical axis direction, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, the fourth lens has negative optical power, the image side surface of the fifth lens is a convex surface, and the image side surface of the eighth lens is a concave surface; The spacer element group includes at least a fifth spacer element and a sixth spacer element, the fifth spacer element is located between the fifth lens and the sixth lens and contacts the image side surface of the fifth lens, and the sixth spacer element is located between the sixth lens and the seventh lens and contacts the image side surface of the sixth lens; The maximum field of view FOV of the optical imaging lens and the aperture number Fno of the optical imaging lens satisfy the following relationship: 5.26≤tan(FOV) / Fno≤7.93; The curvature radius R10 of the image side surface of the fifth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -1.16≤R10 / R12≤0.47; The inner diameter d5m of the image side surface of the fifth spacer element, the inner diameter d6s of the object side surface of the sixth spacer element, and the spacing distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element in the direction of the optical axis satisfy: 0.27≤(d5m+d6s) / EP56≤0.

81.

2. The optical imaging lens according to claim 1, wherein: An inner diameter d5m of the image-side surface of the fifth spacer element and a curvature radius R11 of the object-side surface of the sixth lens satisfy the following relationship: -0.49≤d5m / R11≤1.

14.

3. The optical imaging lens according to claim 1, wherein: An inner diameter d6s of the object side surface of the sixth spacer element, an inner diameter d5m of the image side surface of the fifth spacer element, and a center thickness CT6 of the sixth lens on the optical axis satisfy the following relationship: 0.61≤(d6s-d5m) / CT6≤2.

84.

4. The optical imaging lens according to claim 1, wherein: The spacing distance EP56 between the image side surface of the fifth spacing element and the object side surface of the sixth spacing element in the optical axis direction and the center thickness CT6 of the sixth lens on the optical axis satisfy the following: 1.66≤EP56 / CT6≤3.

53.

5. The optical imaging lens according to claim 1, wherein: The maximum height L of the lens barrel, the center thickness CT8 of the eighth lens on the optical axis, and the air interval T78 between the seventh lens and the eighth lens on the optical axis satisfy: 6.12≤L / (CT8+T78)≤12.

22.

6. The optical imaging lens according to claim 1, wherein: The fifth lens has positive optical power, and the spacer element group also includes a fourth spacer element, which is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens. The effective focal length f5 of the fifth lens, the spacing distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element in the direction of the optical axis, and the center thickness CT5 of the fifth lens on the optical axis satisfy the following: 2.50≤f5 / (EP45+CT5)≤9.

01.

7. The optical imaging lens according to claim 1, wherein: The image side surface of the fourth lens is a concave surface, and the spacer element group also includes a fourth spacer element, which is located between the fourth lens and the fifth lens and partially contacts the image side surface of the fourth lens, and the outer diameter D4s of the object side surface of the fourth spacer element and the curvature radius R8 of the image side surface of the fourth lens satisfy the following relationship: 0.83≤D4s / R8≤1.

58.

8. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a third spacer element, which is located between the third lens and the fourth lens and contacts the image side portion of the third lens. The inner diameter d3s of the object side of the third spacer element and the center thickness CT3 of the third lens on the optical axis satisfy the following: 6.57≤d3s / CT3≤7.

61.

9. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a third spacer element and a fourth spacer element. The third spacer element is located between the third lens and the fourth lens and contacts the image side portion of the third lens. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side portion of the fourth lens. The outer diameter D4m of the image side portion of the fourth spacer element, the outer diameter D3s of the object side portion of the third spacer element, and the spacing distance EP34 between the third spacer element and the fourth spacer element in the optical axis direction satisfy the following: 0.32≤(D4m-D3s) / EP34≤2.

73.

10. The optical imaging lens according to claim 1, wherein: The second lens has negative optical power, the third lens has positive optical power, and the spacer element group further includes a first spacer element, a second spacer element, and a third spacer element. The first spacer element is located between the first lens and the second lens and contacts with the image side surface of the first lens. The second spacer element is located between the second lens and the third lens and contacts with the image side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts with the image side surface of the third lens. The combined focal length f23 of the second lens and the third lens, the spacing distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis direction, and the spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction satisfy the following: 3.57≤f23 / (EP12+EP23)≤10.

68.

11. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The spacer element group also includes a first spacer element, which is located between the first lens and the second lens and contacts the image side surface of the first lens. The outer diameter D0s of the object side end surface of the lens barrel, the inner diameter d0s of the object side end surface of the lens barrel and the inner diameter d1s of the object side surface of the first spacer element satisfy the following relationship: 0.28≤(D0s-d0s) / d1s≤0.

84.

12. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The first lens has positive optical power, and the spacer element group also includes a first spacer element, which is located between the first lens and the second lens and contacts the image side surface of the first lens. The effective focal length f1 of the first lens, and the spacing distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction satisfy: 10.02≤f1 / EP01≤25.

69.

13. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The spacer element group also includes a seventh spacer element, which is located between the seventh lens and the eighth lens and contacts the image side surface of the seventh lens. The maximum height L of the lens barrel, the sum ∑EP of the spacing distances between the object side end surface of the lens barrel and any two adjacent optical elements in the spacer element group on the optical axis, and the spacing distance EP67 between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element in the direction of the optical axis satisfy the following conditions: 2.06≤(L-∑EP) / EP67≤3.

44.

14. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The object side surface of the eighth lens is a concave surface, and the spacer element group also includes an eighth spacer element. The eighth spacer element is located on the image side of the image side surface of the eighth lens, and the eighth spacer element is in partial contact with the image side surface of the eighth lens. The inner diameter d8s of the object side surface of the eighth spacer element and the curvature radius R15 of the object side surface of the eighth lens satisfy the following relationship: -0.95≤d8s / R15≤-0.

41.

15. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The eighth lens has negative optical power, and the spacer element group also includes an eighth spacer element, which is located on the image side of the image side surface of the eighth lens, and the eighth spacer element is in partial contact with the image side surface of the eighth lens, and the inner diameter d8s of the object side surface of the eighth spacer element and the combined focal length f78 of the seventh lens and the eighth lens satisfy the following: -1.74≤d8s / f78≤-0.53.

Images