Optical imaging lens

Abstract

The present invention provides an optical imaging lens. The optical imaging lens includes a lens barrel, eight lenses disposed within the lens barrel, and a fifth spacer element and a sixth spacer element. The optical imaging lens satisfies the following conditions: 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 the following conditions: -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 the following conditions: 0.27≤(d5m+d6s) / EP56≤0.81. The present invention solves the problem in the prior art that relative illumination is affected by the smooth optical path of optical imaging lenses.

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 optical imaging lenses, ensuring image uniformity is crucial, as it directly impacts the visual quality of the image and the accurate transmission of information. Relative illumination, the ratio of brightness at the edge to the center of the imaging surface, is a key metric for measuring image uniformity. In optical imaging lens design, the radius of curvature of the lens has a direct impact on the refraction path and energy distribution of light. This is especially true for edge rays, whose paths are more complex and prone to 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, resulting in the design freedom angle of the lens located in the middle, which easily affects the relative illumination of the optical imaging lens.

[0004] That is to say, in the prior art, the optical imaging lens has a problem of affecting the relative illumination in order to ensure a 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, there is provided an optical imaging lens, comprising a lens barrel, 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 convex, and the image side surface of the first lens is concave, the object side surface of the second lens is concave, the image side surface of the second lens is convex, the object side surface of the third lens is convex, the image side surface of the third lens is concave, the fourth lens has negative optical power, the image side surface of the fifth lens is convex, and the image side surface of the eighth lens is concave; the spacer element group comprises at least a fifth spacer element and a sixth spacer element, and the fifth spacer element is located on the side of the fifth lens. The sixth spacer is located between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens. The sixth spacer 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 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 the following relationship: -1.16≤R10 / R12≤0.47. The inner diameter d5m of the image side surface of the fifth spacer, the inner diameter d6s of the object side surface of the sixth spacer, and the spacing distance EP56 between the image side surface of the fifth spacer and the object side surface of the sixth spacer in the optical axis direction satisfy the following relationship: 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, 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 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 convex, and the image side surface of the first lens is concave, the object side surface of the second lens is concave, 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 fourth lens has negative optical power, the image side surface of the fifth lens is convex, and the image side surface of the eighth lens is 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 the image-side surface 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 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 the following relationship: -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 the following relationship: -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, 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 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 convex, the image side surface of the first lens is concave, the second lens has negative optical power, the object side surface of the second lens is concave, the image side surface of the second lens is convex, the fourth lens has negative optical power, the image side surface of the fourth lens is concave, 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 is in contact 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 is in contact 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 the following: 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 the following: 2.11≤R8×N4 / d3m≤3.25.

[0009] Furthermore, 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 element satisfy the following relationship: -0.49≤d5m / R11≤1.14.

[0010] Furthermore, 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] Furthermore, a 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 and a center thickness CT6 of the sixth lens on the optical axis satisfy: 1.66≤EP56 / CT6≤3.53.

[0012] Furthermore, the maximum height L of the lens barrel, the center thickness CT8 of the eighth lens on the optical axis, and the air gap 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 the following conditions: 2.50≤f5 / (EP45+CT5)≤9.01.

[0014] Furthermore, the image side surface of the fourth lens is concave, and 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 partially contacts the image side surface of the fourth lens. 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.

[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 surface of the third lens. 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.

[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 surface of the third lens. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens. 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.

[0017] Furthermore, 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 the image side surface of the first lens, the second spacer element is located between the second lens and the third lens and contacts 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 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: 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. 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: 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 surface of the first lens. 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 surface of the seventh lens. 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 surface of the sixth spacer element and the object side surface of the seventh spacer element in the optical axis direction satisfy the following conditions: 2.06≤(L-∑EP) / EP67≤3.44.

[0021] Furthermore, the object-side surface of the eighth lens is concave, 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 partially contacts 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 the following relationship: -0.95≤d8s / R15≤-0.41.

[0022] Furthermore, 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 the following relationship: -1.74≤d8s / f78≤-0.53.

[0023] Applying the technical solution of the present invention, an optical imaging lens includes a lens barrel, and a lens group and a spacer element group disposed within the lens barrel, wherein 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, wherein the image side surface of the fifth lens is a convex surface; the spacer element group includes at least a fifth spacer element and a sixth spacer element, wherein the fifth spacer element is located between the fifth lens and the sixth lens and partially 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 partially 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 the following relationship: -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 the following relationship: 0.27≤(d5m+d6s) / EP56≤0.81.

[0024] The optical imaging lens consists of a lens barrel, eight lenses and at least one spacer element. 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. This results in an increase in the angle between the edge light and the center light, guiding more light into the system, increasing the energy loss of the edge light, and causing 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 relationship: -1.16≤R10 / R12≤0.47, the curvature radius of the image side surface of the fifth lens is relatively 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 relative illumination unevenness. In order to reduce the problem of relative illumination unevenness, the present application constrains (d5m+d6s) / EP56 within a reasonable range, which can effectively reduce the obstruction and scattering of light when passing through the fifth spacer element and the sixth spacer 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 accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

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

[0027] Figure 2 1-1 shows a schematic structural diagram of an optical imaging lens according to embodiment 1 of the present invention;

[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 Schematic diagrams showing the structures of optical imaging lenses according to embodiments 1-3 of the present invention are shown;

[0030] Figure 5 shows a graph of magnification chromatic aberration of the optical imaging lens according to the first embodiment of the present invention;

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

[0032] Figure 7 shows an astigmatism curve 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] Figure 9 2. A schematic structural diagram of an optical imaging lens according to embodiment 2-1 of the present invention is shown;

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

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

[0037] Figure 12 shows a magnification chromatic aberration curve of the optical imaging lens according to the second embodiment of the present invention;

[0038] Figure 13 shows an on-axis chromatic aberration curve of the optical imaging lens according to the second embodiment of the present invention;

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

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

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

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

[0043] Figure 18 Schematic diagram of the structure of the optical imaging lens of Example 3-3 of the present invention is shown;

[0044] Figure 19 shows a magnification chromatic aberration curve of the optical imaging lens according to the third embodiment of the present invention;

[0045] Figure 20 shows an on-axis chromatic aberration curve of the optical imaging lens according to the third embodiment of the present invention;

[0046] Figure 21shows an astigmatism curve of the optical imaging lens according to the third embodiment of the present invention;

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

[0048] Figure 24 shows a relative illumination curve diagram of an optical imaging lens according to another optional embodiment of the present invention;

[0049] Figure 25 shows a relative illumination curve diagram of an optical lens in an example;

[0050] Figure 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 spacer; E2, second lens; P2, second spacer; E3, third lens; P3, third spacer; E4, fourth lens; P4, fourth spacer; E5, fifth lens; P5, fifth spacer; E6, sixth lens; P6, sixth spacer; E7, seventh lens; P7, seventh spacer; E8, eighth lens; P8, eighth spacer; 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 of the embodiments in this 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 meaning 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 direction; 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 directional words are not used to limit the present invention.

[0056] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

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

[0058] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method of ordinary knowledge in this field, using the positive and negative R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value in the lens database (lens data) in optical software) to determine the convexity and concavity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave. For the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. 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 by ensuring a smooth light path in an optical imaging lens, the present invention provides an optical imaging lens.

[0060] like Figures 1 to 22As shown, the optical imaging lens includes a lens barrel and a lens group and a spacer element group arranged in the lens barrel, 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, and the image side surface of the fifth lens is a convex 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 is in 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 contact with the image side surface of the sixth lens; the optical imaging lens includes a lens barrel and a lens group and a lens group. The maximum field of view FOV of the 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 element and the curvature radius R12 of the image side surface of the sixth lens element satisfy the following relationship: -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 the following relationship: 0.27≤(d5m+d6s) / EP56≤0.81.

[0061] The optical imaging lens of the present application comprises a lens barrel, eight lenses, and at least one spacer element. When the maximum field of view (FOV) of the optical imaging lens and the aperture number (Fno) of the optical imaging lens satisfy the following condition: 5.26≤tan(FOV) / Fno≤7.93, the relationship between the maximum field of view (FOV) 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 throughput of the optical imaging lens is guaranteed. This results in an increase in the angle between the edge light and the central light, directing more light into the system, increasing the energy loss of the edge light, and causing the brightness of the image edge to be much lower than that of 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 relationship: -1.16≤R10 / R12≤0.47, the curvature radius of the image side surface of the fifth lens is relatively 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 relative illumination unevenness. In order to reduce the problem of relative illumination unevenness, the present application constrains (d5m+d6s) / EP56 within a reasonable range, which can effectively reduce the obstruction and scattering of light when passing through the fifth spacer element and the sixth spacer 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 Figures 23 to 26 As shown, Figure 23 A relative illumination curve is shown when tan(FOV) / Fno=5.7, R10 / R12=-0.52, and (d5m+d6s) / EP56=0.29 is satisfied, where the abscissa is the half field of view angle and the ordinate is the relative illumination. Figure 24 The relative illumination curve is shown when tan(FOV) / Fno=5.7, R10 / R12= -0.52, (d5m+d6s) / EP56=0.73. Figure 23 and Figure 24 It can be seen that when the optical imaging lens satisfies 0.27≤(d5m+d6s) / EP56≤0.81, the sizes of the fifth and sixth spacer elements are reasonable, there is less blocking and scattering of light, the loss of edge light is small, and the relative illumination is good. Figure 25 The relative illumination curve is shown when tan(FOV) / Fno=5.7, R10 / R12= -0.52, (d5m+d6s) / EP56=0.12. Figure 25 It can be seen that when (d5m+d6s) / EP56 is less than 0.27, the distance between the fifth and sixth spacer elements in the optical axis direction is too long, and the light propagation path is too long, resulting in refraction loss and energy attenuation during the transmission process, affecting the effective transmission of light flux. Figure 23 、 Figure 24 and Figure 25 It can be seen that Figure 25 The relative illumination performance of the optical imaging lens shown is poor. Figure 26 The relative illumination curve is shown when tan(FOV) / Fno=5.7, R10 / R12=-0.52, and (d5m+d6s) / EP56=0.94. When (d5m+d6s) / EP56 is greater than 0.81, the distance between the fifth and sixth spacer elements along the optical axis is too short, and the light propagation path is too compact, resulting in light obstruction or premature scattering, increasing energy loss. Figure 23 、 Figure 24 and Figure 26 It can be seen that Figure 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 to a reasonable range, constraining the inner diameters of the fifth and sixth spacer elements, as well as the spacing between the fifth and sixth spacer elements, to ensure the propagation path of edge light, reduce edge light obstruction, and reduce energy loss caused by refraction loss, energy attenuation, and premature scattering. This effectively increases the energy of edge light and the relative illumination of the optical imaging lens, resolving the relative illumination issues associated with 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 without relying on the optical power and surface shape of other lenses, which are further optimizations of the optical imaging lens based on this. 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 also 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 the following conditions: 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 positive power, which can converge light, deflecting large-angle light toward the optical axis to further increase the intensity of edge light. In another example, in some optional embodiments, the second lens has negative power, which can balance the aberrations introduced by the first lens, thereby further improving image quality. In another example, in some optional embodiments, the third lens has positive power, which can appropriately converge light, ensuring a smooth transition to the rear. In another example, in some optional embodiments, the fourth lens has negative power, which can balance the aberrations introduced by the front lens, improving image quality, while also appropriately diverging the light, facilitating a smooth transition to the rear optical system. In another example, in some optional embodiments, the fifth lens has positive power, which can appropriately converge light, preventing severe light diffusion and chip mismatch. In another example, in some optional embodiments, the eighth lens has negative power, which can balance the aberrations introduced by the front positive lens, improving image quality, while also appropriately diverging the light, facilitating a smooth transition 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 direction 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-mentioned software and / or tools, the surface shape of each lens can be simulated and appropriately adjusted according to the surface shape provided by 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 radius of curvature R11 of the object-side surface of the sixth lens element satisfy the following relationship: -0.49 ≤ d5m / R11 ≤ 1.14. By constraining d5m / R11 within a reasonable range, the range of light entering the sixth lens element and the angle of light deflection when passing through the object-side surface of the sixth lens element can be controlled, thereby effectively adjusting the focusing characteristics of light in the sixth lens element, ensuring the clarity and uniformity of the image formed by 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 central thickness CT6 of the sixth lens on the optical axis satisfy the following relationship: 0.61≤(d6s-d5m) / CT6≤2.84. By constraining (d6s-d5m) / CT6 within a reasonable range, the light propagation path within the lens assembly can be optimized. In particular, the incident angle and beam width of light from the fifth lens to the sixth lens can be controlled, effectively intercepting light entering the optical structure area of the eighth lens element and stray light exiting the optical structure area of the sixth lens element. By properly setting the relationship between the difference between d6s and d5m and CT6, stray light can be effectively intercepted, while the refractive effect of the sixth lens element can be controlled, ensuring more uniform focusing of light on the imaging surface.

[0069] In some optional embodiments, the optical axis spacing distance EP56 between the image-side surface of the fifth spacer element and the object-side surface of the sixth spacer element, and the optical axis center thickness CT6 of the sixth lens element satisfy the following relationship: 1.66≤EP56 / CT6≤3.53. By constraining EP56 / CT6 within a reasonable range, this helps adjust the light deflection angle, reduces the sensitivity of the sixth lens element, and ensures that the optical imaging lens maintains excellent imaging performance under various lighting conditions. This also helps improve the moldability of the sixth lens element and the yield rate 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 gap T78 between the seventh and eighth lenses on the optical axis satisfy the following relationship: 6.12 ≤ L / (CT8 + T78) ≤ 12.22. By constraining L / (CT8 + T78) within a reasonable range, the accuracy of the light propagation path and focus point within the lens assembly can be ensured, aberrations caused by improper light refraction can be reduced, and uniform imaging quality can be ensured, especially avoiding vignetting and other uneven lighting issues, allowing the optical imaging lens to maintain excellent imaging performance even in complex environments.

[0071] In some optional embodiments, the fifth lens element has positive optical power, the spacer element assembly further includes a fourth spacer element, the fourth spacer element being positioned between the fourth lens element and the fifth lens element and partially contacting the image-side surface of the fourth lens element. The effective focal length f5 of the fifth lens element, the separation distance EP45 along the optical axis between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element, and the center thickness CT5 of the fifth lens element on the optical axis satisfy the following relationship: 2.50 ≤ f5 / (EP45 + CT5) ≤ 9.01. By controlling the relationship between f5, EP45, and CT5, light can be focused along a desired path after passing through the fifth lens, reducing defocus and aberrations, ensuring the stability of the focal position and optical path of the fifth lens, and thereby improving image clarity and quality.

[0072] In some optional embodiments, the image-side surface of the fourth lens is concave, and the spacer element assembly further includes a fourth spacer element. The fourth spacer element is positioned between the fourth lens and the fifth lens and partially contacts the image-side surface of the fourth lens. The outer diameter D4s of the object-side surface of the fourth spacer element and the radius of curvature R8 of the image-side surface of the fourth lens satisfy the following relationship: 0.83 ≤ D4s / R8 ≤ 1.58. Controlling the range of D4s / R8 facilitates precise adjustment of the refraction angle of light passing through the fourth lens. This ensures that, after passing through the fourth lens, light forms a spot on the imaging surface that is neither overly concentrated nor overly dispersed, thereby improving imaging uniformity and clarity.

[0073] In some optional embodiments, the spacer assembly further includes a third spacer element, positioned between the third and fourth lens elements and partially contacting the image-side surface of the third lens. The inner diameter d3s of the object-side surface of the third spacer element and the central thickness CT3 of the third lens on the optical axis satisfy the following relationship: 6.57 ≤ d3s / CT3 ≤ 7.61. By constraining d3s / CT3 within a reasonable range, the path of light through the third lens can be optimized, ensuring that marginal light emitted from the third lens passes through the third spacer element. This reduces optical distortion, such as field curvature and distortion, thereby improving image clarity and precision and ensuring accurate representation of image details.

[0074] In some optional embodiments, the spacer assembly further includes a third spacer and a fourth spacer. The third spacer is positioned between the third and fourth lens elements and partially contacts the image-side surface of the third lens. The fourth spacer is positioned between the fourth and fifth lens elements and partially contacts the image-side surface of the fourth lens. 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 separation distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis satisfy the following relationship: 0.32 ≤ (D4m - D3s) / EP34 ≤ 2.73. By constraining (D4m - D3s) / EP34 within a reasonable range, the distribution of light in the peripheral field of view can be effectively managed, while simultaneously intercepting marginal stray light and optimizing the light distribution of the rear lens group, thereby improving brightness uniformity and imaging quality in the peripheral region. Furthermore, constraining the separation distance between the third and fourth spacer elements along the optical axis ensures sufficient space between the third and fourth spacer elements, thereby ensuring the stability of the optical imaging lens structure and tolerance during assembly.

[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 the image side surface of the first lens. The second spacer element is located between the second lens and the third lens and contacts the image side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts 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: 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 image. It can also constrain the combined focal length of the second and third lenses, optimize the light transmission path, and thus facilitate the adjustment and control of depth of field to provide better visual effects.

[0076] In some optional embodiments, the spacer element group further includes a first spacer element, the first spacer element being positioned between the first lens and the second lens and partially contacting 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. By constraining (D0s-d0s) / d1s within a reasonable range, it is ensured that light entering from the front end of the lens can propagate smoothly, avoiding light obstruction caused by excessively thick lens barrel walls. By rationally controlling the ratio of the difference between D0s and d0s and the inner diameter d1s of the first spacer element, it is possible to ensure that the spatial layout between the lens barrel and the first spacer element utilizes light most efficiently, reducing edge light loss, thereby improving the relative illumination of the entire system.

[0077] In some optional embodiments, the first lens has positive refractive power, the spacer element assembly further includes a first spacer element, the first spacer element being positioned between the first lens and the second lens element and partially contacting the image-side surface of the first lens. The effective focal length f1 of the first lens and the separation distance EP01 along the optical axis between the object-side end surface of the lens barrel and the object-side surface of the first spacer element satisfy the following relationship: 10.02 ≤ f1 / EP01 ≤ 25.69. By constraining f1 / EP01 within a reasonable range, the efficiency of light entering the front end of the lens barrel can be improved, mechanical light obstruction can be reduced, and sufficiently high luminous flux can be maintained even in low-light conditions, resulting in brighter and clearer images.

[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. The maximum height L of the lens barrel, the sum of the distances ∑EP between the object-side end face of the lens barrel and any two adjacent optical elements in the spacer element group along the optical axis between the lens barrel and any two adjacent optical elements, and the distance EP67 between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis satisfy the following relationship: 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 efficient light transmission, reduce light loss, ensure uniform brightness distribution during imaging, and avoid contrast loss or color distortion caused by light loss.

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

[0080] In some optional embodiments, the object-side surface of the eighth lens element is concave, the spacer element assembly further includes an eighth spacer element, the eighth spacer element is located image-side of the image-side surface of the eighth lens element, and the eighth spacer element partially contacts the image-side surface of the eighth lens element. The inner diameter d8s of the object-side surface of the eighth spacer element and the radius of curvature R15 of the object-side surface of the eighth lens element satisfy the following relationship: -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, preventing excessive concentration or divergence of light, thereby ensuring uniform light distribution on the imaging surface, and facilitating improved imaging uniformity and quality.

[0081] In some optional embodiments, the eighth lens element has negative optical 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 surface of the eighth lens element, and the eighth spacer element partially contacts the image side surface of the eighth lens element. The inner diameter d8s of the object side surface of the eighth spacer element and the combined focal length f78 of the seventh and eighth lenses satisfy the following relationship: -1.74≤d8s / f78≤-0.53. By constraining d8s / f78 within a reasonable range, the propagation path of light passing through the seventh and eighth lenses is effectively concentrated, preventing excessive light divergence, effectively improving light utilization in the optical system, avoiding vignetting effects caused by overfocusing, and ensuring high contrast and high quality images. At the same time, the range of light passing through the spacer element of the eighth lens element is guaranteed, further improving light uniformity on the imaging surface, and particularly reducing the brightness difference between the center and edge of the imaging surface.

[0082] In another optional embodiment, the optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel, the lens group consisting of eight lenses, the lens group including 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 convex, the image side surface of the first lens is concave, the object side surface of the second lens is concave, the image side surface of the second lens is convex, the object side surface of the third lens is convex, the image side surface of the third lens is concave, the fourth lens has negative optical power, the image side surface of the fifth lens is convex, and the image side surface of the eighth lens is concave; The spacer element group includes at least a fifth spacer element, which is located between the fifth lens and the sixth lens and contacts the image side surface 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 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 the following relationship: -1.16≤R10 / R12≤0.47; and 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 the following relationship: -0.49≤d5m / R11≤1.14.

[0083] The optical imaging lens of the present application comprises a lens barrel, eight lenses, and at least one spacer element. When the maximum field of view (FOV) of the optical imaging lens and the aperture number (Fno) of the optical imaging lens satisfy the following condition: 5.26≤tan(FOV) / Fno≤7.93, the relationship between the maximum field of view (FOV) 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 throughput of the optical imaging lens is guaranteed. This results in an increase in the angle between the edge light and the central light, directing more light into the system, increasing the energy loss of the edge light, and causing the brightness of the image edge to be much lower than that of 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 relationship: -1.16≤R10 / R12≤0.47, the curvature radius of the image side surface of the fifth lens is relatively 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 and sixth lenses, limit the shape adjustment space of the fifth and sixth lenses, and cannot effectively compensate for the path deviation of the edge light, further increasing the problem of relative illumination unevenness. In order to reduce the problem of relative illumination unevenness, 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 light when passing through the object side surface of the sixth lens, thereby effectively adjusting the focusing characteristics of light in the sixth lens, ensuring the clarity and uniformity of the imaging of the optical imaging lens, and thus improving the relative illumination unevenness.

[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 includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel, the lens group consisting of eight lenses, the lens group including 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 convex, the image side surface of the first lens is concave, the second lens has negative optical power, the object side surface of the second lens is concave, the image side surface of the second lens is convex, the third lens has positive optical power, the fourth lens has negative optical power, and the image side surface of the fourth lens is concave. 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 is in contact 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 is in contact 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 the following: 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 the following: 2.11≤R8×N4 / d3m≤3.25.

[0086] The optical imaging lens system of the present application comprises a lens barrel, eight lenses, and at least one spacer element. The optical axis spacing EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element, the optical axis air spacing T23 between the second and third lenses, and the optical axis air spacing T34 between the third and fourth lenses satisfy the following relationship: 3.58 ≤ EP23 / (T23 + T34) ≤ 6.80. To ensure assembly stability of the optical imaging lens at the position of the third lens, the air spacing between the second and third lenses, as well as the air spacing between the third and fourth lenses, is reduced. Due to space limitations, the design freedom of the third lens is limited. Light rays rapidly converged by the third lens into the rear optical system are prone to significant deflection, resulting in stray light. By constraining R8 × N4 / d3m within a reasonable range, the present application can limit the height of the light rays entering the fourth lens and the deflection angle of the light rays exiting the image-side surface of the fourth lens. This facilitates controlling light transmission along a predetermined path, reduces light rays entering the rear optical system with significant deflection, and thereby reduces stray light and improves 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 the photosensitive element located on the imaging surface.

[0089] It should be noted that each lens includes an optically effective diameter region located at the center and an optically structured region located at the edge. The optically structured region is located outside the optically effective region and is arranged circumferentially around the optically effective region. The optically effective region is used for the passage of imaging light, while the optically structured region is not used for the passage of imaging light and is used for contact with the lens barrel, adjacent lenses, or adjacent spacer elements. The optically structured region is also referred to as the non-effective diameter region.

[0090] The optical imaging lens in this application may utilize multiple lenses, such as the eight lenses described above. In this application, at least one of the lens surfaces is an aspheric surface. Aspheric lenses are characterized by a continuously varying curvature from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspheric lenses have a better curvature radius characteristic, with the advantages of improving distortion and astigmatism. The use of aspheric lenses can minimize aberrations that occur during imaging, thereby improving image quality.

[0091] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while eight lenses are described in the embodiments, the optical imaging lens is not limited to eight lenses. If desired, the optical imaging lens may 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 labeled to provide a clear and intuitive understanding of their meaning. To facilitate the description of the optical imaging lens and specific lens surface shapes, these parameters will not be reflected in the accompanying drawings when describing specific embodiments.

[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 Example 1, there are Examples 1-1, 1-2, and 1-3; in Example 2, there are Examples 2-1, 2-2, and 2-3; and in Example 3, there are Examples 3-1, 3-2, and 3-3. While the three optical imaging lenses within the same embodiment share the same parameters such as the radius of curvature, center thickness, and spacing between lenses, as well as the higher-order coefficients, the barrel, the thickness, inner and outer diameters of the first, second, and third spacers, and the shapes of some lenses, differ. In other words, the primary imaging structures are the same, while the auxiliary imaging structures 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] Example 1

[0097] like Figures 2 to 8 As shown, the optical imaging lens of embodiment 1 is described. Figure 2 1-1 shows a schematic structural diagram of the optical imaging lens of Example 1-1. Figure 3 Schematic diagram of the structure of the optical imaging lens of Example 1-2 is shown. Figure 4 Schematic diagrams of the structures of the optical imaging lenses of Examples 1-3 are shown.

[0098] like Figures 2 to 4 As shown, the optical imaging lens includes a lens barrel, eight lenses and multiple spacer elements. The lens barrel includes, arranged from the object side to the image side, 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.

[0099] like Figure 21-1 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 element partially contacts the lens barrel. The object-side surface and image-side surface of the first spacer element partially contact the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. The object-side surface and image-side surface of the second spacer element partially contact the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object side surface and image side surface of the third spacer element are partially in 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 partially in 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 partially in 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 partially in 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 partially in 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 partially in contact with the object side surface of the eighth spacer element.

[0100] like Figure 3 FIG2 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 spacer element is the same as that of Example 1-1, and the relevant description in Example 1-1 can be referred to and will not be repeated here.

[0101] like Figure 4 FIG2 is a schematic diagram of the structure of the optical imaging lens of Example 1-3. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 1-1. Please refer to the relevant description of Example 1-1 and will not be repeated here.

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

[0103] In Example 1, the first lens E1 has positive focal power, with its object-side surface S1 being convex, and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being concave, and its image-side surface S4 being convex. The third lens E3 has positive focal power, with its object-side surface S5 being convex, and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being concave, and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being concave, and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being convex, and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex, and its image-side surface S14 being convex. The eighth lens element E8 has negative power. Its object-side surface S15 is concave, and its image-side surface S16 is concave. In Table 2, S17 and S18 (not shown) can represent the object-side and image-side surfaces of a filter or protective glass. S19 (not shown) represents the imaging surface. OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, which is located on the first lens element.

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

[0105] Table 2

[0106]

[0107] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the eighth lens E8 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0108] Formula (1)

[0109] Where x is the distance from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; and Ai is the correction coefficient for the i-th order of the aspheric surface. Table 3 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface S1-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 Example 1 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 Example 1 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 Example 1 is shown, which represents 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 Example 1 can achieve good imaging quality.

[0114] Example 2

[0115] like Figures 9 to 15 As shown, the optical imaging lens of the second embodiment is described. Figure 9 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2-1. Figure 10 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2-2. Figure 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 multiple spacer elements. The lens barrel includes, arranged from the object side to the image side, 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.

[0117] like Figure 92-1 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 element partially contacts the lens barrel. The object-side surface and image-side surface of the first spacer element partially contact the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. The object-side surface and image-side surface of the second spacer element partially contact the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object side surface and image side surface of the third spacer element are partially in 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 partially in 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 partially in 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 partially in 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 partially in 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 partially in contact with the object side surface of the eighth spacer element.

[0118] like Figure 10 FIG2 is a schematic structural diagram of the optical imaging lens of Example 2-2. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 2-1. Please refer to the relevant description of Example 2-1 and will not be repeated here.

[0119] like Figure 11 FIG2 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 spacer element is the same as that of Example 2-1. Please refer to the relevant description of Example 2-1 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 Example 2, the first lens E1 has positive focal power, with its object-side surface S1 being convex, and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being concave, and its image-side surface S4 being convex. The third lens E3 has positive focal power, with its object-side surface S5 being convex, and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex, and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being convex, and its image-side surface S10 being convex. The sixth lens E6 has positive focal power, with its object-side surface S11 being convex, and its image-side surface S12 being convex. The seventh lens E7 has negative focal power, with its object-side surface S13 being concave, and its image-side surface S14 being concave. The eighth lens element E8 has negative power. Its object-side surface S15 is concave, and its image-side surface S16 is concave. In Table 4, S17 and S18 (not shown) can represent the object-side and image-side surfaces of a filter or protective glass. S19 (not shown) represents the imaging surface. OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, which is located on the first lens element.

[0122] Table 4 shows the basic structural parameters of the optical imaging lens of Example 2, wherein the units of curvature radius 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 of the aspheric mirror surfaces S1-S16 in Example 2. The surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0126] Table 5

[0127]

[0128] Figure 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. Figure 13 The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 14 The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 15A distortion curve diagram of the optical imaging lens of Example 2 is shown, which represents 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] Example 3

[0131] like Figures 16 to 22 As shown, the optical imaging lens of Example 3 is described. Figure 16 FIG3 shows a schematic structural diagram of the optical imaging lens of Example 3-1. Figure 17 FIG3 shows a schematic structural diagram of the optical imaging lens of Example 3-2. Figure 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 multiple spacer elements. The lens barrel includes, arranged from the object side to the image side, 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.

[0133] like Figure 16 FIG3 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 element partially contacts the lens barrel. The object-side surface and image-side surface of the first spacer element P1 partially contact the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. The object-side surface and image-side surface of the second spacer element partially contact the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object side surface and image side surface of the third spacer element are partially in 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 partially in 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 partially in 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 partially in 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 partially in 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 partially in contact with the object side surface of the eighth spacer element.

[0134] like Figure 17FIG3 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 spacer element is the same as that of Example 3-1. Please refer to the relevant description of Example 3-1 and will not be repeated here.

[0135] like Figure 18 FIG3 is a schematic structural diagram of an optical imaging lens according to Example 3-3. In this example, the supporting and abutting manner of each spacer element is the same as that of Example 3-1. For reference, the relevant description in Example 3-1 can be made 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 Example 3, the first lens E1 has positive focal power, with its object-side surface S1 being convex, and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being concave, and its image-side surface S4 being convex. The third lens E3 has positive focal power, with its object-side surface S5 being convex, and its image-side surface S6 being concave. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex, and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being convex, and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave, and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex, and its image-side surface S14 being convex. The eighth lens element E8 has negative power. Its object-side surface S15 is concave, and its image-side surface S16 is concave. In Table 2, S17 and S18 (not shown) can represent the object-side and image-side surfaces of a filter or protective glass. S19 (not shown) represents the imaging surface. OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, which is located on the first lens element.

[0138] Table 6 shows the basic structural parameters of the optical imaging lens of Example 3, where the units of curvature radius 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 of the aspheric mirror surfaces S1-S16 in Example 2. The surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0142] Table 7

[0143]

[0144] Figure 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. Figure 20 The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 21 The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 22 A distortion curve diagram of the optical imaging lens of Example 3 is shown, which represents 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 Example 3 can achieve good imaging quality.

[0146] In summary, the optical imaging lenses of Examples 1 to 3 respectively satisfy the relationships 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, FOV unit: °).

[0150] Table 9

[0151]

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

[0153] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0155] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0156] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that: The lens barrel comprises 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, the object side surface of the first lens is convex, the image side surface of the first lens is concave, the object side surface of the second lens is concave, the image side surface of the second lens is convex, the object side surface of the third lens is convex, the image side surface of the third lens is concave, the fourth lens has negative optical power, the image side surface of the fifth lens is convex, and the image side surface of the eighth lens is concave; 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 conditions: 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 the following relationship: -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: The inner diameter d6s of the object-side surface of the sixth spacer, the inner diameter d5m of the image-side surface of the fifth spacer, and the 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: A 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 and a 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 gap T78 between the seventh lens and the eighth lens on the optical axis satisfy the following: 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 further 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 optical axis direction, and the center thickness CT5 of the fifth lens on the optical axis satisfy the following conditions: 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 concave, and 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. 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 surface of the third lens. 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 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 surface of the third lens. The fourth spacer element is located between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens. 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 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 the image side surface of the first lens. The second spacer element is located between the second lens and the third lens and contacts the image side surface of the second lens. The third spacer element is located between the third lens and the fourth lens and contacts 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, wherein: 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, wherein: The first lens has positive optical power, and the spacer element group further 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 the following: 10.02≤f1 / EP01≤25.

69.

13. The optical imaging lens according to any one of claims 1 to 10, wherein: 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 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 surface of the sixth spacer element and the object side surface of the seventh spacer element in the optical axis direction 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, wherein: The object-side surface of the eighth lens is concave, and 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 partially contacts the image-side surface of the eighth lens. An inner diameter d8s of the object-side surface of the eighth spacer element and a 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, wherein: The eighth lens has negative optical power, and 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 partially contacts the image side surface of the eighth lens. 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 relationship: -1.74≤d8s / f78≤-0.53.

Images