Optical imaging lens

Abstract

The utility model provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a spacing element group, the lens group and the spacing element group are arranged in the lens barrel, the lens group is composed of eight lenses, and the eight lenses are sequentially 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 from the object side to the image side; eP12 / CT2 is greater than or equal to 2.82 and less than or equal to 3.75; r3 / D2s is greater than or equal to 1.73 and less than or equal to 2.51. The eight-piece optical imaging lens solves the problem that in the prior art, an eight-piece optical imaging lens restrains the size of a front-end lens so as to meet the assembly precision, so that light passes through the front-end lens to generate serious stray light.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging lens. Background Technology

[0002] With the continuous development of portable electronic devices, manufacturers are placing increasingly higher demands on the imaging capabilities of the optical lenses used in them. Eight-element optical lenses are widely used in various electronic devices, such as the camera systems of smartphones and tablets, because they can meet user imaging needs. However, the design of eight-element optical lenses faces numerous challenges in reducing assembly complexity, ensuring assembly precision, and simultaneously meeting imaging requirements.

[0003] Currently, eight-element optical imaging lenses typically require constraints on the size of the front lens, especially its thickness, to ensure assembly precision and reduce assembly difficulty. However, this can easily lead to an unreasonable shape for the front lens, resulting in severe stray light as light passes through it. This stray light not only reduces image sharpness and color accuracy but can also easily form ghosting under certain conditions, severely interfering with the imaging effect and affecting the final image quality of the optical imaging lens.

[0004] In other words, the existing eight-element optical imaging lens has a constraint on the size of the front lens to meet assembly accuracy, which leads to serious stray light generated when light passes through the front lens. Utility Model Content

[0005] The main objective of this invention is to provide an optical imaging lens that solves the problem in existing eight-element optical imaging lenses where the size of the front lens is constrained to meet assembly precision, resulting in severe stray light generated when light passes through the front lens.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group disposed within the lens barrel. The lens group consists of eight lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The spacer element group includes a first spacer element disposed between the first and second lenses and in contact with the image side of the first lens, and a second spacer element disposed between the second and third lenses and in contact with the image side of the second lens. The distance EP12 between the image side of the first spacer element and the object side of the second spacer element on the optical axis of the optical imaging lens satisfies the following relationship with the center thickness CT2 of the second lens on the optical axis: 2.82 ≤ EP12 / CT2 ≤ 3.75; the radius of curvature R3 of the object side of the second lens satisfies the following relationship with the outer diameter D2s of the object side of the second spacer element: 1.73 ≤ R3 / D2s ≤ 2.51.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of eight lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side of the second lens. The distance EP12 between the image side of the first spacer element and the object side of the second spacer element on the optical axis of the optical imaging lens satisfies the following relationship between the center thickness CT2 of the second lens on the optical axis: 2.82 ≤ EP12 / CT2 ≤ 3.75. The radius of curvature R4 of the image side of the second lens, the outer diameter D2s of the object side of the second spacer element, and the outer diameter D1s of the object side of the first spacer element satisfy the following relationship: -0.07 ≤ R4 × (D2s - D1s) ≤ 1.27.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group disposed within the lens barrel. The lens group consists of eight lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side of the second lens. Spacer elements; wherein, the distance EP12 between the image side of the first spacer element and the object side of the second spacer element on the optical axis of the optical imaging lens and the center thickness CT2 of the second lens on the optical axis satisfy: 2.82≤EP12 / CT2≤3.75; the distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer element on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP2 of the second spacer element satisfy: 3.64≤EP01 / (T12+CP2)≤4.91.

[0009] Furthermore, the radius of curvature R2 of the image side of the first lens, the outer diameter D1s of the object side of the first spacer element, and the inner diameter d1s of the object side of the first spacer element satisfy the following condition: 6.07≤R2 / (D1s-d1s)≤12.11.

[0010] Furthermore, the central thickness CT3 of the third lens on the optical axis, the air gap T23 between the second and third lenses on the optical axis, and the maximum axial thickness CP2 of the second spacer element satisfy the following condition: 6.86≤CT3 / (T23+CP2)≤7.63.

[0011] Furthermore, the spacer group also includes a third spacer element placed between the third lens and the fourth lens and in contact with the image side of the third lens. The air gap T34 between the third lens and the fourth lens on the optical axis, the maximum axial thickness CP3 of the third spacer element, and the distance EP23 between the image side of the second spacer element and the object side of the third spacer element on the optical axis satisfy the following: 0.84≤(T34+CP3) / EP23≤1.76.

[0012] Furthermore, the spacer group also includes a third spacer element placed between the third lens and the fourth lens and in contact with the image side of the third lens. The radius of curvature R6 of the image side of the third lens, the outer diameter D3s of the object side of the third spacer element, and the inner diameter d3s of the object side of the third spacer element satisfy the following: 4.49≤R6 / (D3s-d3s)≤13.31.

[0013] Furthermore, the spacer group also includes a third spacer element placed between the third lens and the fourth lens and in contact with the image side of the third lens, and a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. The spacing distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy the following: 1.52≤EP34 / CT4≤3.94.

[0014] Furthermore, the spacer group also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. The air gap T45 between the fourth lens and the fifth lens on the optical axis satisfies the following condition with respect to the maximum axial thickness CP4 of the fourth spacer element: 1.96≤T45 / CP4≤2.82.

[0015] Furthermore, the spacer group also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. The radius of curvature R8 of the image side of the fourth lens, the outer diameter D4s of the object side of the fourth spacer element, and the inner diameter d4s of the object side of the fourth spacer element satisfy the following: -3.34≤R8 / (D4s-d4s)≤-2.81.

[0016] Furthermore, the spacer group also includes a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens. The air gap T56 between the fifth lens and the sixth lens on the optical axis satisfies the following condition with respect to the maximum axial thickness CP5 of the fifth spacer element: 2.29≤T56 / CP5≤2.85.

[0017] Furthermore, the spacer group also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, and a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens. The effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens on the optical axis, and the spacing distance EP45 between the image side of the fourth spacer element and the object side of the fifth spacer element on the optical axis satisfy the following: 11.06≤f5 / (CT5+EP45)≤12.63.

[0018] Furthermore, the spacer group also includes a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens. The radius of curvature R10 of the image side of the fifth lens and the inner diameter d5s of the object side of the fifth spacer element satisfy the following: 5.48≤R10 / d5s≤5.76.

[0019] Furthermore, the spacer group also includes a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens. The center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth and seventh lenses on the optical axis, and the distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element on the optical axis satisfy the following: 1.67≤(CT6+T67) / EP56≤2.69.

[0020] Furthermore, the spacer group also includes a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens, and a seventh spacer element placed between the seventh lens and the eighth lens and in contact with the image side of the seventh lens. The center thickness CT7 of the seventh lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, and the spacing distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element on the optical axis satisfy the following: 0.94≤(CT7+CT8) / EP67≤1.45.

[0021] Furthermore, the spacer group also includes a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens. The radius of curvature R13 of the object side of the seventh lens, the outer diameter D6m of the image side of the sixth spacer element, and the inner diameter d6m of the image side of the sixth spacer element satisfy the following: 1.28≤R13 / (D6m-d6m)≤1.63.

[0022] Furthermore, the spacer group also includes a seventh spacer element placed between the seventh lens and the eighth lens and in contact with the image side of the seventh lens. The inner diameter d7s of the object side of the seventh spacer element and the radius of curvature R14 of the image side of the seventh lens satisfy the following condition: 1.36≤d7s / R14≤1.71.

[0023] Furthermore, the distance EP01 between the object-side end face of the lens barrel and the object-side side face of the first spacer element on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element satisfy the following: 3.64≤EP01 / (T12+CP1)≤4.91.

[0024] Furthermore, the first lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the second lens has negative optical power, its object-side surface is convex, and its image-side surface is concave; the seventh lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; and the eighth lens has negative optical power, its object-side surface is convex, and its image-side surface is concave.

[0025] Furthermore, the third lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the fourth lens has negative optical power, its object-side surface is concave, and its image-side surface is convex; the fifth lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; and the sixth lens has positive optical power, its object-side surface is convex, and its image-side surface is concave.

[0026] Applying the technical solution of this utility model, the optical imaging lens of this application consists of a lens barrel and eight lenses and multiple spacer elements disposed within the lens barrel. By rationally arranging the positions of the eight lenses, the first spacer element, and the second spacer element, and setting 2.82≤EP12 / CT2≤3.75, it can be ensured that the relative positions of the first and second spacer elements and the second lens are maintained within a reasonable range during assembly. Simultaneously, controlling the center thickness and edge thickness of the second lens on the optical axis helps reduce assembly errors, avoids assembly difficulties caused by excessive crowding of the second lens, the first spacer element, and the second spacer element, reduces the assembly difficulty of the optical imaging lens, and improves assembly stability. However, under this condition, the shape of the second lens at the front of the optical imaging lens is easily unreasonable, resulting in severe stray light when light passes through the second lens. This stray light not only reduces the sharpness and color accuracy of the image but also easily forms ghosting under certain conditions, seriously interfering with the imaging effect and affecting the final imaging quality of the optical imaging lens. Therefore, by constraining 1.73≤R3 / D2s≤2.51, this application can control the curvature of the object side surface of the second lens, thereby controlling the degree of light deflection by the second lens, ensuring the transmission path of light when passing through the second lens. At the same time, by constraining the outer diameter of the object side surface of the second spacer element, the second spacer element can intercept and absorb stray light, reduce the reflection of stray light inside the optical imaging lens, achieve the purpose of reducing stray light, and thus improve the imaging quality of the optical imaging lens. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0028] Figure 1 A dimensioned diagram of an optical imaging lens according to an alternative embodiment of the present invention is shown;

[0029] Figure 2 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of this utility model is shown;

[0030] Figure 3A schematic diagram of the structure of the optical imaging lens of Embodiments 1-2 of this utility model is shown;

[0031] Figures 4 to 7 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 of this utility model are shown respectively.

[0032] Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-1 of this utility model is shown;

[0033] Figure 9 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-2 of this utility model is shown;

[0034] Figures 10 to 13 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 of this utility model are shown respectively.

[0035] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of this utility model is shown;

[0036] Figure 15 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of this utility model is shown;

[0037] Figures 16 to 19 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 of this utility model are shown respectively.

[0038] Figure 20 A schematic diagram of the structure of the optical imaging lens of Embodiment 4-1 of this utility model is shown;

[0039] Figure 21 A schematic diagram of the structure of the optical imaging lens of Embodiment 4-2 of this utility model is shown;

[0040] Figures 22 to 25 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 of this utility model are shown respectively.

[0041] Figure 26 The stray light energy distribution diagram of the optical imaging lens of Scheme 1 of this utility model is shown when EP12 / CT2=3.14 and R3 / D2s=2.37 is satisfied;

[0042] Figure 27 The stray light energy distribution diagram is shown for the optical imaging lens of Comparative Example 1 when EP12 / CT2 = 3.14 and R3 / D2s = 1.65.

[0043] Figure 28 The stray light energy distribution diagram is shown for the optical imaging lens of Comparative Example 2 when EP12 / CT2 = 3.14 and R3 / D2s = 2.57.

[0044] The above figures include the following reference numerals:

[0045] P0, Lens tube; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; E5, Fifth lens; S9, Object-side surface of the fifth lens; S10, Image-side surface of the fifth lens; E6, Sixth lens; S 11. Object-side surface of the sixth lens; S12. Image-side surface of the sixth lens; E7. Seventh lens; S13. Object-side surface of the seventh lens; S14. Image-side surface of the seventh lens; E8. Eighth lens; S15. Object-side surface of the eighth lens; S16. Image-side surface of the eighth lens; P1. First spacer element; P2. Second spacer element; P3. Third spacer element; P3b. Third auxiliary spacer element; P4. Fourth spacer element; P5. Fifth spacer element; P6. Sixth spacer element; P7. Seventh spacer element. Detailed Implementation

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] 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 one of ordinary skill in the art to which this application pertains.

[0048] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

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

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

[0051] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, 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 commonly known in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. 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.

[0052] To address the problem that existing eight-element optical imaging lenses constrain the size of the front lens to meet assembly precision, resulting in severe stray light after light passes through the front lens, this invention provides an optical imaging lens.

[0053] like Figures 1 to 26 As shown, in an optional embodiment of this application, an optical imaging lens is provided, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of eight lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side of the second lens. The distance EP12 between the image side of the first spacer element and the object side of the second spacer element on the optical axis of the optical imaging lens satisfies the following relationship with the center thickness CT2 of the second lens on the optical axis: 2.82 ≤ EP12 / CT2 ≤ 3.75; the radius of curvature R3 of the object side of the second lens satisfies the following relationship with the outer diameter D2s of the object side of the second spacer element: 1.73 ≤ R3 / D2s ≤ 2.51.

[0054] The optical imaging lens of this application consists of a lens barrel and eight lenses and multiple spacers disposed within the lens barrel. By rationally arranging the positions of the eight lenses, the first spacer, and the second spacer, and setting 2.82≤EP12 / CT2≤3.75, it can be ensured that the relative positions of the first and second spacers and the second lens remain within a reasonable range during assembly. Simultaneously, controlling the center thickness and edge thickness of the second lens on the optical axis helps reduce assembly errors, avoids assembly difficulties caused by excessive crowding of the second lens, first spacer, and second spacer, reduces the assembly difficulty of the optical imaging lens, and improves assembly stability. However, under these conditions, the shape of the second lens at the front of the optical imaging lens may be unreasonable, resulting in severe stray light when light passes through the second lens. This stray light not only reduces the sharpness and color accuracy of the image but also easily forms ghosting under certain conditions, seriously interfering with the imaging effect and affecting the final image quality of the optical imaging lens. Therefore, by constraining 1.73≤R3 / D2s≤2.51, this application can control the curvature of the object side surface of the second lens, thereby controlling the degree of light deflection by the second lens, ensuring the transmission path of light when passing through the second lens. At the same time, by constraining the outer diameter of the object side surface of the second spacer element, the second spacer element can intercept and absorb stray light, reduce the reflection of stray light inside the optical imaging lens, achieve the purpose of reducing stray light, and thus improve the imaging quality of the optical imaging lens.

[0055] In addition, please refer to Table 1 below. Figures 26 to 28 As shown, under the premise that the optical imaging lens satisfies 2.82≤EP12 / CT2≤3.75, for example, EP12 / CT2=3.14, Figure 26 The stray light energy distribution diagram of the optical imaging lens of Scheme 1 of this utility model is shown when R3 / D2s=2.37; Figure 27 The stray light energy distribution diagram is shown for the optical imaging lens of Comparative Example 1 when R3 / D2s = 1.65; Figure 28 The stray light energy distribution diagram is shown for the optical imaging lens of Comparative Example 2 when R3 / D2s = 2.57.

[0056] Depend on Figures 26 to 28 As shown, when the optical imaging lens satisfies R3 / D2s = 2.37, the peak intensity of stray light energy on the imaging plane of the optical imaging lens is 8.9E-7 lm / mm. 2 The stray light energy is low, and the overall performance is good. When the optical imaging lens satisfies R3 / D2s = 1.65, D2s is small, the radius of curvature of the object side of the second lens is less curved, the deflection angle of light is reduced, and stray light is easily generated. The peak intensity of stray light energy on the imaging surface of the optical imaging lens is between 1.2E and 6 lm / mm.2 The stray light energy is relatively strong, resulting in poor overall performance. When the optical imaging lens satisfies R3 / D2s = 2.57, R3 decreases while D2s becomes larger. This makes it easier for stray light to be reflected to the edge of the image plane, leading to high stray light energy. The peak intensity of stray light energy at the imaging plane of the optical imaging lens is between 1.4E and 6 lm / mm. 2 The stray light energy is high, resulting in poor overall performance. Therefore, when 2.82≤EP12 / CT2≤3.75 and R3 / D2s is within the range of 1.73 to 2.51, the values ​​of R3 and D2s are more reasonable, resulting in lower stray light energy and the best overall performance. Thus, by constraining 2.82≤EP12 / CT2≤3.75 and 1.73≤R3 / D2s≤2.51, this application can control the curvature of the object-side surface of the second lens, thereby controlling the degree of light deflection by the second lens and ensuring the transmission path of light passing through it. Simultaneously, by constraining the outer diameter of the object-side surface of the second spacer element, the second spacer element can intercept and absorb stray light, reducing its reflection within the optical imaging lens, thereby reducing stray light and improving the imaging quality of the optical imaging lens.

[0057] Table 1

[0058] Solution 1 of this utility model Comparative Example 1 Comparative Example 2 EP12 / CT2 3.14 3.14 3.14 R3 / D2s 2.37 1.65 2.57

[0059] In this embodiment, the spacer group further includes a third spacer element placed between the third lens and the fourth lens and in contact with the image side of the third lens, a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens, and a seventh spacer element placed between the seventh lens and the eighth lens and in contact with the image side of the seventh lens.

[0060] In this embodiment, the radius of curvature R2 of the image-side surface of the first lens, the outer diameter D1s of the object-side surface of the first spacer element, and the inner diameter d1s of the object-side surface of the first spacer element satisfy the condition: 6.07 ≤ R2 / (D1s-d1s) ≤ 12.11. By controlling this condition, the proportional relationship between the radius of curvature of the image-side surface of the first lens and the difference between the inner and outer diameters of the object-side surface of the first spacer element can be controlled. This helps light pass through the first lens more smoothly, reducing stray light caused by light refraction and reflection, thereby improving the image purity of the optical imaging lens. If R2 / (D1s-d1s) is less than 6.07, then R2 is too small, and the first lens's ability to deflect light is insufficient, leading to a larger effective focal length of the optical imaging lens, which is not conducive to the miniaturization of the optical imaging lens. If R2 / (D1s-d1s) is greater than 12.11, then the difference between the inner and outer diameters of the object-side surface of the first spacer element is too small, resulting in a weaker ability of the first spacer element to block stray light, affecting the image quality of the optical imaging lens.

[0061] In this embodiment, the central thickness CT3 of the third lens on the optical axis, the air gap T23 between the second and third lenses on the optical axis, and the maximum axial thickness CP2 of the second spacer element satisfy the following condition: 6.86 ≤ CT3 / (T23+CP2) ≤ 7.63. By controlling this condition, the relationship between the central thickness of the third lens on the optical axis, the air gap between the second and third lenses on the optical axis, and the maximum axial thickness of the second spacer element can be adjusted. This helps to enhance the structural stability of the optical imaging lens, simplify the manufacturing and assembly process of the optical imaging lens, and also helps to reduce production costs, ensure production efficiency, and improve the consistency and reliability of the optical imaging lens.

[0062] In this embodiment, the air gap T34 between the third and fourth lenses on the optical axis, the maximum axial thickness CP3 of the third spacer element, and the distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element on the optical axis satisfy the condition: 0.84 ≤ (T34 + CP3) / EP23 ≤ 1.76. By controlling this condition, the air gap between the third and fourth lenses on the optical axis, the maximum axial thickness of the third spacer element, and the distance between the image-side surface of the second spacer element and the object-side surface of the third spacer element on the optical axis can be adjusted. This helps to control the relative positions of the third lens, the second spacer element, and the third spacer element during assembly, avoiding assembly errors caused by improper spacing between them, and making the assembly process more orderly and controllable. Furthermore, assembly personnel can more accurately adjust the distance between the third and fourth lenses on the optical axis, reducing unnecessary adjustment and inspection steps, thereby simplifying the assembly process and improving the production efficiency of optical imaging lenses.

[0063] In this embodiment, the radius of curvature R6 of the image-side surface of the third lens, the outer diameter D3s of the object-side surface of the third spacer element, and the inner diameter d3s of the object-side surface of the third spacer element satisfy the following condition: 4.49 ≤ R6 / (D3s-d3s) ≤ 13.31. By controlling this condition, the ratio of the radius of curvature of the image-side surface of the third lens to the difference between the inner and outer diameters of the object-side surface of the third spacer element can be adjusted, reducing stray light generated inside the optical imaging lens, thereby reducing the formation of ghost light paths and weakening the propagation of ghost light paths, enriching the details and sense of depth in the image, and thus improving the imaging quality of the optical imaging lens. If R6 / (D3s-d3s) is less than 4.49, the inner diameter of the third spacer element is too small, and the third spacer element will obstruct the normal passage of effective light, resulting in lower illumination of the optical imaging lens. If R6 / (D3s-d3s) is greater than 13.29, the difference between the inner and outer diameters of the object side of the third spacer element is too small, which weakens the third spacer element's ability to control stray light, resulting in more stray light in the optical imaging lens and reduced image quality.

[0064] In this embodiment, the distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element on the optical axis, and the center thickness CT4 of the fourth lens on the optical axis, satisfy the condition: 1.52 ≤ EP34 / CT4 ≤ 3.94. By controlling this condition, the ratio between the distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element on the optical axis and the center thickness of the fourth lens on the optical axis can be controlled, making the size matching of the third spacer element, the fourth spacer element, and the fourth lens more reasonable, thereby reducing the axial length and volume of the optical imaging lens and contributing to the compact design of the optical imaging lens. In addition, constraining the above formula can also maximize the use of the internal space of the optical imaging lens, avoid space waste, and make the optical imaging lens smaller, lighter, and more stable in assembly while maintaining high performance.

[0065] In this embodiment, the air gap T45 between the fourth and fifth lenses on the optical axis satisfies the following condition: 1.96 ≤ T45 / CP4 ≤ 2.82. By controlling this condition, the ratio between the air gap between the fourth and fifth lenses on the optical axis and the maximum axial thickness of the fourth spacer element can be constrained. This helps to more accurately control the relative positions of the fourth, fifth, and fourth spacers during the assembly of the optical imaging lens, ensuring high-precision assembly. Furthermore, constraining this condition also makes it easier for operators to calibrate and adjust the optical imaging lens after assembly, facilitating automated assembly and improving production efficiency and consistency.

[0066] In this embodiment, the radius of curvature R8 of the image-side surface of the fourth lens, the outer diameter D4s of the object-side surface of the fourth spacer element, and the inner diameter d4s of the object-side surface of the fourth spacer element satisfy the condition: -3.34 ≤ R8 / (D4s-d4s) ≤ -2.81. By controlling this condition, the ratio between the radius of curvature of the image-side surface of the fourth lens and the difference between the inner and outer diameters of the object-side surface of the fourth spacer element can be controlled. This not only ensures that effective light can pass through the fourth lens normally, but also allows the fourth spacer element to block stray light paths caused by light refraction or reflection. If R8 / (D4s-d4s) is greater than -2.81, the fourth spacer element is prone to blocking the imaging light, thus affecting the amount of light transmitted; if R8 / (D4s-d4s) is less than -3.34, the effect of the fourth spacer element in blocking stray light is weakened, the image quality deteriorates, and the assembly stability of the optical imaging lens is also affected.

[0067] In this embodiment, the air gap T56 between the fifth and sixth lenses on the optical axis and the maximum axial thickness of the fifth spacer element significantly reduce the stray light blocking effect of the fourth spacer element, satisfying the condition that 2.29 ≤ T56 / CP5 ≤ 2.85. By controlling this condition, the ratio of the air gap between the fifth and sixth lenses on the optical axis to the maximum axial thickness of the fifth spacer element can be kept reasonable. This helps assembly personnel to more quickly determine and adjust the on-axis spacing of the fifth and sixth lenses, avoiding excessive trial and error and fine-tuning, and reducing the risk of collisions or scratches to the fifth and sixth lenses due to improper on-axis spacing. Constraining this condition not only reduces assembly time but also improves the efficiency of assembly personnel, allowing the optical imaging lens to enter the subsequent testing and quality control stages more quickly.

[0068] In this embodiment, the effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens on the optical axis, and the distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element on the optical axis satisfy the following condition: 11.06 ≤ f5 / (CT5+EP45) ≤ 12.63. By controlling this condition, the relationship between the effective focal length of the fifth lens, the center thickness of the fifth lens on the optical axis, and the distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element on the optical axis can be precisely controlled, resulting in a more uniform thickness distribution of the fifth lens. This effectively reduces stress concentration caused by uneven thickness of the fifth lens, thereby improving the stability of the fifth lens. Furthermore, by reasonably constraining the above formula, the relative positions between the fifth lens, the fourth spacer element, and the fifth spacer element of the optical imaging lens are optimized, thereby significantly improving the assembly stability and imaging performance of the optical imaging lens.

[0069] In this embodiment, the radius of curvature R10 of the image-side surface of the fifth lens and the inner diameter d5s of the object-side surface of the fifth spacer element satisfy the condition: 5.48 ≤ R10 / d5s ≤ 5.76. By controlling this condition, the ratio between the radius of curvature of the image-side surface of the fifth lens and the inner diameter of the object-side surface of the fifth spacer element can be controlled, thereby optimizing the light transmission path in the optical imaging lens, reducing unnecessary stray light reflection and scattering, thus reducing the impact of stray light and ghosting on image quality, and also enhancing the adaptability of the optical imaging lens to complex imaging environments.

[0070] In this embodiment, the central thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth and seventh lenses on the optical axis, and the distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element on the optical axis satisfy the following condition: 1.67 ≤ (CT6 + T67) / EP56 ≤ 2.69. By controlling this condition, the relationship between the central thickness of the sixth lens on the optical axis, the air gap between the sixth and seventh lenses on the optical axis, and the distance between the image side of the fifth spacer element and the object side of the sixth spacer element on the optical axis can be constrained. This ensures the compactness of the internal structure of the optical imaging lens, which is beneficial for reducing the axial length of the optical imaging lens, improving its portability, and avoiding the problem of image quality degradation caused by excessive compression of the internal structure.

[0071] In this embodiment, the center thickness CT7 of the seventh lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, and the distance EP67 between the image side of the sixth spacer and the object side of the seventh spacer on the optical axis satisfy the following condition: 0.94 ≤ (CT7 + CT8) / EP67 ≤ 1.45. By controlling this condition, the relationship between the center thickness of the seventh lens on the optical axis, the center thickness of the eighth lens on the optical axis, and the distance between the image side of the sixth spacer and the object side of the seventh spacer on the optical axis can be constrained. This allows for control of the edge thickness of the seventh lens and the center thickness of the seventh and eighth lenses within a reasonable range, facilitating assembly work and ensuring that the seventh lens, eighth lens, sixth spacer, and seventh spacer of the optical imaging lens fit tightly during assembly, reducing assembly errors caused by dimensional mismatches.

[0072] In this embodiment, the radius of curvature R13 of the object-side surface of the seventh lens, the outer diameter D6m of the image-side surface of the sixth spacer element, and the inner diameter d6m of the image-side surface of the sixth spacer element satisfy the condition: 1.28 ≤ R13 / (D6m-d6m) ≤ 1.63. By controlling this condition, the ratio of the difference between the radius of curvature of the object-side surface of the seventh lens and the difference between the inner and outer diameters of the image-side surface of the sixth spacer element can be controlled. This allows for precise control of the size of the sixth spacer element, ensuring normal light transmission while also preventing stray light paths caused by light refraction or reflection. If R13 / (D6m-d6m) is less than 1.28, then (D6m-d6m) is too large, and the sixth spacer element will obstruct the normal transmission of effective light, thereby reducing the illumination of the optical imaging lens. If R13 / (D6m-d6m) is greater than 1.63, then R8 is too large, and the central and peripheral rays cannot converge at the imaging surface, resulting in blurred images.

[0073] In this embodiment, the inner diameter d7s of the object-side surface of the seventh spacer element and the radius of curvature R14 of the image-side surface of the seventh lens satisfy the condition: 1.36 ≤ d7s / R14 ≤ 1.71. By controlling this condition, the ratio of the inner diameter of the object-side surface of the seventh spacer element to the radius of curvature of the image-side surface of the seventh lens can be controlled, which helps to reduce multiple reflections of light inside the optical imaging lens, thereby reducing stray light and ghosting, and improving image purity. Furthermore, while ensuring the performance of the optical imaging lens, constraining the above formula provides some flexibility in dimensional tolerances during manufacturing, reducing the precision requirements for the optical imaging lens.

[0074] In this embodiment, the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the maximum axial thickness CP1 of the first spacer element satisfy the following condition: 3.64 ≤ EP01 / (T12 + CP1) ≤ 4.91. By controlling this condition, the relationship between the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element on the optical axis, the air gap between the first lens and the second lens on the optical axis, and the maximum axial thickness of the first spacer element can be controlled. This optimizes the assembly gap between the object-side end face of the lens barrel, the first lens, and the first spacer element, helping to reduce the degradation of image quality caused by assembly errors, avoiding excessive interference and loss of light during transmission between the first lens and the second lens, thereby maintaining high image quality and improving the overall quality and reliability of the optical imaging lens.

[0075] In this embodiment, the first lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the second lens has negative optical power, its object-side surface is convex, and its image-side surface is concave; the seventh lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the eighth lens has negative optical power, its object-side surface is convex, and its image-side surface is concave; the third lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the fourth lens has negative optical power, its object-side surface is concave, and its image-side surface is convex; the fifth lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; and the sixth lens has positive optical power, its object-side surface is convex, and its image-side surface is concave. By rationally planning the optical power and surface shape of each lens, it is beneficial to control the light path, ensure the stability of light transmission, eliminate aberrations, and ensure image quality.

[0076] Optionally, the optical imaging lens in the embodiments of this application can be simulated using software and / or tools such as ZEMAX and CODEV. During the simulation process using such software and / or tools, the surface profile of each lens can be appropriately adjusted according to the surface profile simulation provided by the software and / or tools used.

[0077] In this embodiment, each lens can be optionally configured as a tangent lens. The outer diameter surface of the tangent lens has a tangent structure and a non-tangent structure, with the outer diameter of the tangent structure being smaller than the outer diameter of the non-tangent structure. The outer diameter of the tangent lens typically refers to the outer diameter of the non-tangent structure.

[0078] In this embodiment, each spacer element can be optionally configured as a truncated spacer element. The outer ring surface of the truncated spacer element has a truncated portion and a non-truncated portion, with the outer diameter of the truncated portion being smaller than the outer diameter of the non-truncated portion. The outer diameter of the truncated spacer element typically refers to the maximum outer diameter of the non-truncated portion.

[0079] In another optional embodiment of this application, an optical imaging lens is provided, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of eight lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side of the first lens, and a second spacer element placed between the second lens and the third lens and in contact with the image side of the second lens. The distance EP12 between the image side of the first spacer element and the object side of the second spacer element on the optical axis of the optical imaging lens satisfies the following relationship between the center thickness CT2 of the second lens on the optical axis: 2.82≤EP12 / CT2≤3.75. The radius of curvature R4 of the image side of the second lens, the outer diameter D2s of the object side of the second spacer element, and the outer diameter D1s of the object side of the first spacer element satisfy the following relationship: -0.07≤R4×(D2s-D1s)≤1.27.

[0080] The optical imaging lens of this application consists of a lens barrel and eight lenses and multiple spacers disposed within the lens barrel. By rationally arranging the positions of the eight lenses, the first spacer, and the second spacer, and setting 2.82≤EP12 / CT2≤3.75, it can be ensured that the relative positions of the first and second spacers and the second lens remain within a reasonable range during assembly. Simultaneously, controlling the center thickness and edge thickness of the second lens on the optical axis helps reduce assembly errors, avoids assembly difficulties caused by excessive crowding of the second lens, first spacer, and second spacer, reduces the assembly difficulty of the optical imaging lens, and improves assembly stability. However, under these conditions, the shape of the second lens at the front of the optical imaging lens may be unreasonable, resulting in severe stray light when light passes through the second lens. This stray light not only reduces the sharpness and color accuracy of the image but also easily forms ghosting under certain conditions, seriously interfering with the imaging effect and affecting the final image quality of the optical imaging lens. Therefore, by constraining -0.07≤R4×(D2s-D1s)≤1.27, this application can control the curvature of the image side of the second lens, thereby controlling the degree of light deflection by the second lens, ensuring that the light transmission path is appropriate when passing through the second lens. At the same time, by constraining the outer diameter of the object side of the first and second spacers, the first and second spacers intercept and absorb stray light, reducing the scattering or reflection of stray light inside the optical imaging lens, thereby reducing stray light and improving the imaging quality of the optical imaging lens.

[0081] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0082] In another optional embodiment of this application, an optical imaging lens is also provided, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of eight lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens, and a spacer element disposed between the second lens and the third lens and in contact with the image side of the second lens. The second spacer element; wherein, the distance EP12 between the image side of the first spacer element and the object side of the second spacer element on the optical axis of the optical imaging lens and the center thickness CT2 of the second lens on the optical axis satisfy: 2.82≤EP12 / CT2≤3.75; the distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer element on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP2 of the second spacer element satisfy: 3.64≤EP01 / (T12+CP2)≤4.91.

[0083] The optical imaging lens of this application consists of a lens barrel and eight lenses and multiple spacers disposed within the lens barrel. By rationally arranging the positions of the eight lenses, the first spacer, and the second spacer, and setting 2.82≤EP12 / CT2≤3.75, it can be ensured that the relative positions of the first and second spacers and the second lens remain within a reasonable range during assembly. Simultaneously, controlling the center thickness and edge thickness of the second lens on the optical axis helps reduce assembly errors, avoids assembly difficulties caused by excessive crowding of the second lens, first spacer, and second spacer, reduces the assembly difficulty of the optical imaging lens, and improves assembly stability. However, under these conditions, the shape of the second lens at the front of the optical imaging lens may be unreasonable, resulting in severe stray light when light passes through the second lens. This stray light not only reduces the sharpness and color accuracy of the image but also easily forms ghosting under certain conditions, seriously interfering with the imaging effect and affecting the final image quality of the optical imaging lens. Therefore, by constraining 3.64≤EP01 / (T12+CP2)≤4.91, this application can limit the distance between the object-side end face of the lens barrel and the object-side side face of the first spacer element on the optical axis, the air gap between the first lens and the second lens on the optical axis, and the maximum axial thickness of the second spacer element. This optimizes the structure and position of the second lens, ensures the rationality of the front-end structure layout, and ensures that the second lens can effectively control the deflection and transmission path of light. This helps to reduce stray light formed at the second lens, avoids excessive stray light and ghosting, and thus improves the clarity and color accuracy of the image.

[0084] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0085] Optionally, the aforementioned optical imaging lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0086] The optical imaging lens in this application may employ multiple lenses, such as the eight lenses described above. In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0087] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although an embodiment is described using eight lenses as an example, the optical imaging lens is not limited to including eight lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0088] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided. Figure 1 The parameters d1s, D1s, D2s, d3s, D3s, d4s, D4s, d5s, d6m, D6m, d7s, CP1, CP2, CP3, CP4, CP5, EP01, EP12, EP23, EP34, EP45, EP56, and EP67 are clearly and intuitively illustrated to provide a clear understanding of their meaning. To facilitate the description of the optical imaging lens and the specific lens shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0089] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical imaging lenses applicable to the above embodiments.

[0090] It should be noted that in the following Embodiment 1, there are two examples: Embodiment 1-1 and Embodiment 1-2; in Embodiment 2, there are two examples: Embodiment 2-1 and Embodiment 2-2; in Embodiment 3, there are two examples: Embodiment 3-1 and Embodiment 3-2; and in Embodiment 4, there are two examples: Embodiment 4-1 and Embodiment 4-2. In the two examples within the same embodiment, the curvature radius, center thickness, and other parameters of the optical imaging lens from the first to the eighth lens, as well as the spacing distance between the lenses and the higher-order coefficients, are the same. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer element, and the seventh spacer element are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0091] It should be noted that any one of the examples in Embodiments 1 to 4 described below is applicable to all implementations of this application.

[0092] Example 1

[0093] like Figures 2 to 7 As shown, the optical imaging lens of Embodiment 1 is described. Figure 2 A schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 3 A schematic diagram of the optical imaging lens of Embodiments 1-2 is shown.

[0094] like Figures 2 to 3 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8, arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0. In this embodiment, a pressure ring is also provided on the image side of the eighth lens E8.

[0095] like Figure 2The diagram shows a schematic of the optical imaging lens in Embodiment 1-1. In this example, the object-side and image-side of the first spacer element P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer element P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer element P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side and image-side of the fourth spacer element P4 are in contact with the image-side S8 of the fourth lens and the object-side S9 of the fifth lens, respectively. The object-side and image-side of the fifth spacer element P5 are in contact with the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The object-side and image-side of the sixth spacer element P6 are in contact with the image-side S12 of the sixth lens and the object-side S13 of the seventh lens, respectively. The object-side and image-side of the seventh spacer element P7 are in contact with the image-side S14 of the seventh lens and the object-side S15 of the eighth lens, respectively. The object-side surface of the pressure ring contacts the image-side surface S16 of the eighth lens.

[0096] like Figure 3 The diagram shows a schematic of the optical imaging lens in Embodiments 1-2. In this example, a third auxiliary spacer element P3b is also provided on the image side of the third spacer element P3. In this case, the image side of the third spacer element P3 contacts the object side of the third auxiliary spacer element P3b, and the image side of the third auxiliary spacer element P3b contacts the object side S7 of the fourth lens. Apart from this, the contact and abutment methods of the remaining spacer elements are the same as in Embodiment 1-1, and can be found in the relevant descriptions in Embodiment 1-1, which will not be repeated here.

[0097] In summary, the structural parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1 and 1-2 are shown in Table 2.

[0098] Table 2

[0099] Parameters / Examples 1-1 1-2 d1s(mm) 2.993 2.993 D1s(mm) 4.234 5.195 D2s(mm) 4.230 5.543 d3s(mm) 3.570 3.568 D3s(mm) 4.439 5.991 d4s(mm) 3.725 3.725 D4s(mm) 6.690 6.750 d5s(mm) 4.540 4.540 d6m (mm) 5.387 5.387 D6m (mm) 7.687 7.747 d7s(mm) 6.014 6.014 CP1(mm) 0.022 0.022 CP2 (mm) 0.022 0.022 CP3 (mm) 0.022 0.409 CP4 (mm) 0.022 0.022 CP5 (mm) 0.022 0.022 EP01(mm) 1.177 1.275 EP12(mm) 0.665 0.567 EP23(mm) 0.602 0.608 EP34(mm) 0.891 0.409 EP45(mm) 0.621 0.498 EP56(mm) 0.550 0.620 EP67(mm) 0.840 0.550

[0100] In Embodiment 1, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is concave. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0101] In Embodiment 1, the effective focal length f1 of the first lens is 7.76 mm, the effective focal length f2 of the second lens is -8.31 mm, the effective focal length f3 of the third lens is 6.67 mm, the effective focal length f4 of the fourth lens is -22.96 mm, the effective focal length f5 of the fifth lens is 11.63 mm, the effective focal length f6 of the sixth lens is 18.77 mm, the effective focal length f7 of the seventh lens is 12.05 mm, and the effective focal length f8 of the eighth lens is -4.60 mm.

[0102] Table 3 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0103] Table 3

[0104]

[0105] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the eighth lens E8 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0106]

[0107] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror S1-S16 in Example 1.

[0108] Table 4

[0109]

[0110]

[0111] Figure 4 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 5 The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6 The distortion curve of the optical imaging lens of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 7 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0112] according to Figures 4 to 7 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0113] Example 2

[0114] like Figures 8 to 13 As shown, the optical imaging lens of Embodiment 2 is described. Figure 8 A schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 9 A schematic diagram of the optical imaging lens of Embodiment 2-2 is shown.

[0115] like Figures 8 to 9 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8, arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0. In this embodiment, a pressure ring is also provided on the image side of the eighth lens E8.

[0116] like Figure 8 The diagram shows a schematic of the optical imaging lens in Embodiment 2-1. In this example, the object-side and image-side of the first spacer element P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer element P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer element P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side and image-side of the fourth spacer element P4 are in contact with the image-side S8 of the fourth lens and the object-side S9 of the fifth lens, respectively. The object-side and image-side of the fifth spacer element P5 are in contact with the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The object-side and image-side of the sixth spacer element P6 are in contact with the image-side S12 of the sixth lens and the object-side S13 of the seventh lens, respectively. The object-side and image-side of the seventh spacer element P7 are in contact with the image-side S14 of the seventh lens and the object-side S15 of the eighth lens, respectively. The object-side surface of the pressure ring contacts the image-side surface S16 of the eighth lens.

[0117] like Figure 9The diagram shown is a schematic representation of the optical imaging lens in Embodiment 2-2. In this example, a third auxiliary spacer element P3b is also provided on the image side of the third spacer element P3. In this case, the image side of the third spacer element P3 contacts the object side of the third auxiliary spacer element P3b, and the image side of the third auxiliary spacer element P3b contacts the object side S7 of the fourth lens. Apart from this, the contact and abutment methods of the remaining spacer elements are the same as in Embodiment 2-1, and can be found in the relevant description in Embodiment 2-1, which will not be repeated here.

[0118] In summary, the structural parameters of the optical imaging lens in Embodiment 2 under Embodiments 2-1 and 2-2 are shown in Table 5.

[0119] Table 5

[0120]

[0121]

[0122] In Embodiment 2, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is concave. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0123] In Example 2, the effective focal length f1 of the first lens is 7.86 mm, the effective focal length f2 of the second lens is -8.32 mm, the effective focal length f3 of the third lens is 6.65 mm, the effective focal length f4 of the fourth lens is -21.85 mm, the effective focal length f5 of the fifth lens is 11.99 mm, the effective focal length f6 of the sixth lens is 21.25 mm, the effective focal length f7 of the seventh lens is 15.36 mm, and the effective focal length f8 of the eighth lens is -4.73 mm.

[0124] Table 6 shows the basic structural parameters of the optical imaging lens in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0125] Table 6

[0126]

[0127] Table 7 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical lens S1-S16 in Example 2. The surface shape of each aspherical lens is defined according to formula (1) in Example 1.

[0128] Table 7

[0129]

[0130] Figure 10 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 11 The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12 The distortion curve of the optical imaging lens of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 13 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0131] according to Figures 10 to 13 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0132] Example 3

[0133] like Figures 14 to 19 As shown, the optical imaging lens of Embodiment 3 is described. Figure 14 A schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 15 A schematic diagram of the optical imaging lens of Embodiment 3-2 is shown.

[0134] like Figures 14 to 15 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8, arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0. In this embodiment, a pressure ring is also provided on the image side of the eighth lens E8.

[0135] like Figure 14The diagram shows a schematic of the optical imaging lens in Embodiment 3-1. In this example, the object-side and image-side of the first spacer element P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer element P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer element P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side and image-side of the fourth spacer element P4 are in contact with the image-side S8 of the fourth lens and the object-side S9 of the fifth lens, respectively. The object-side and image-side of the fifth spacer element P5 are in contact with the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The object-side and image-side of the sixth spacer element P6 are in contact with the image-side S12 of the sixth lens and the object-side S13 of the seventh lens, respectively. The object-side and image-side of the seventh spacer element P7 are in contact with the image-side S14 of the seventh lens and the object-side S15 of the eighth lens, respectively. The object-side surface of the pressure ring contacts the image-side surface S16 of the eighth lens.

[0136] like Figure 15 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-2. In this example, the bearing and contact method of each spacer element is the same as that of Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0137] In summary, the structural parameters of the optical imaging lens in Embodiment 3 under Embodiments 3-1 and 3-2 are shown in Table 8.

[0138] Table 8

[0139]

[0140]

[0141] In Embodiment 3, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is concave. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0142] In Embodiment 3, the effective focal length f1 of the first lens is 7.91 mm, the effective focal length f2 of the second lens is -8.40 mm, the effective focal length f3 of the third lens is 6.61 mm, the effective focal length f4 of the fourth lens is -20.90 mm, the effective focal length f5 of the fifth lens is 12.34 mm, the effective focal length f6 of the sixth lens is 22.12 mm, the effective focal length f7 of the seventh lens is 21.13 mm, and the effective focal length f8 of the eighth lens is -5.09 mm.

[0143] Table 9 shows the basic structural parameters of the optical imaging lens in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0144] Table 9

[0145]

[0146]

[0147] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical lens S1-S16 in Example 3. The surface shape of each aspherical lens is defined according to formula (1) in Example 1.

[0148] Table 10

[0149]

[0150] Figure 16 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 17 The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 18 The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 19 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0151] according to Figures 16 to 19 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0152] Example 4

[0153] like Figures 20 to 25 As shown, the optical imaging lens of Embodiment 4 is described. Figure 20 A schematic diagram of the optical imaging lens of Embodiment 4-1 is shown. Figure 21A schematic diagram of the optical imaging lens of Embodiment 4-2 is shown.

[0154] like Figures 20 to 21 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8, arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0. In this embodiment, a pressure ring is also provided on the image side of the eighth lens E8.

[0155] like Figure 20 The diagram shows a schematic of the optical imaging lens in Embodiment 4-1. In this example, the object-side and image-side of the first spacer element P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer element P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer element P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side and image-side of the fourth spacer element P4 are in contact with the image-side S8 of the fourth lens and the object-side S9 of the fifth lens, respectively. The object-side and image-side of the fifth spacer element P5 are in contact with the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The object-side and image-side of the sixth spacer element P6 are in contact with the image-side S12 of the sixth lens and the object-side S13 of the seventh lens, respectively. The object-side and image-side of the seventh spacer element P7 are in contact with the image-side S14 of the seventh lens and the object-side S15 of the eighth lens, respectively. The object-side surface of the pressure ring contacts the image-side surface S16 of the eighth lens.

[0156] like Figure 21 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 4-2. In this example, the bearing and contact method of each spacer element is the same as that of Embodiment 4-1, and can be referred to the relevant description in Embodiment 4-1, which will not be repeated here.

[0157] In summary, the structural parameters of the optical imaging lens of Embodiment 4 under Embodiments 4-1 and 4-2 are shown in Table 11.

[0158] Table 11

[0159]

[0160]

[0161] In Embodiment 4, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave. The object-side surface S7 of the fourth lens is concave, and the image-side surface S8 of the fourth lens is convex. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is concave. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave. The object-side surface S15 of the eighth lens is convex, and the image-side surface S16 of the eighth lens is concave.

[0162] In Example 4, the effective focal length f1 of the first lens is 7.95 mm, the effective focal length f2 of the second lens is -8.68 mm, the effective focal length f3 of the third lens is 6.54 mm, the effective focal length f4 of the fourth lens is -19.82 mm, the effective focal length f5 of the fifth lens is 13.07 mm, the effective focal length f6 of the sixth lens is 21.06 mm, the effective focal length f7 of the seventh lens is 51.30 mm, and the effective focal length f8 of the eighth lens is -5.67 mm.

[0163] Table 12 shows the basic structural parameters of the optical imaging lens in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0164] Table 12

[0165]

[0166]

[0167] Table 13 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical lens S1-S16 in Example 4. The surface shape of each aspherical lens is defined according to formula (1) in Example 1.

[0168] Table 13

[0169]

[0170]

[0171] Figure 22 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 23 The astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 24The distortion curve of the optical imaging lens of Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 25 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0172] according to Figures 22 to 25 It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0173] In summary, Examples 1 to 4 satisfy the relationships shown in Table 14.

[0174] Table 14

[0175]

[0176] Table 15 shows the effective focal lengths of each lens in the optical imaging lenses of Embodiments 1 to 4.

[0177] Table 15

[0178]

[0179]

[0180] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone 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.

[0181] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0182] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0183] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0184] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An optical imaging lens, characterized in that, It includes a lens barrel and a lens assembly and a spacer assembly disposed within the lens barrel. The lens group consists of eight lenses, which are arranged in the following order from the object side to the image side: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens; The spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side of the first lens, and a second spacer element placed between the second lens and the third lens and in contact with the image side of the second lens; Wherein, the distance EP12 between the image side of the first spacer element and the object side of the second spacer element on the optical axis of the optical imaging lens and the center thickness CT2 of the second lens on the optical axis satisfy: 2.82≤EP12 / CT2≤3.75; the radius of curvature R3 of the object side of the second lens and the outer diameter D2s of the object side of the second spacer element satisfy: 1.73≤R3 / D2s≤2.

51.

2. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R2 of the image side of the first lens, the outer diameter D1s of the object side of the first spacer element, and the inner diameter d1s of the object side of the first spacer element satisfy the following condition: 6.07≤R2 / (D1s-d1s)≤12.

11.

3. The optical imaging lens according to claim 1, characterized in that, The central thickness CT3 of the third lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, and the maximum axial thickness CP2 of the second spacer element satisfy the following condition: 6.86≤CT3 / (T23+CP2)≤7.

63.

4. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens. The air gap T34 between the third lens and the fourth lens on the optical axis, the maximum axial thickness CP3 of the third spacer element, and the distance EP23 between the image side of the second spacer element and the object side of the third spacer element on the optical axis satisfy the following condition: 0.84≤(T34+CP3) / EP23≤1.

76.

5. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens. The radius of curvature R6 of the image side of the third lens, the outer diameter D3s of the object side of the third spacer element, and the inner diameter d3s of the object side of the third spacer element satisfy the following condition: 4.49≤R6 / (D3s-d3s)≤13.

31.

6. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens. The distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy the following condition: 1.52≤EP34 / CT4≤3.

94.

7. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens. The fourth lens and the fifth lens satisfy the following condition regarding the air gap T45 on the optical axis and the maximum axial thickness CP4 of the fourth spacer element: 1.96≤T45 / CP4≤2.

82.

8. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens. The radius of curvature R8 of the image side of the fourth lens, the outer diameter D4s of the object side of the fourth spacer element, and the inner diameter d4s of the object side of the fourth spacer element satisfy the following condition: -3.34≤R8 / (D4s-d4s)≤-2.

81.

9. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens. The fifth lens and the sixth lens satisfy the following condition regarding the air gap T56 on the optical axis and the maximum axial thickness CP5 of the fifth spacer element: 2.29≤T56 / CP5≤2.

85.

10. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens. The effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens on the optical axis, and the distance EP45 between the image side of the fourth spacer element and the object side of the fifth spacer element on the optical axis satisfy the following condition: 11.06≤f5 / (CT5+EP45)≤12.

63.

11. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens. The radius of curvature R10 of the image side of the fifth lens and the inner diameter d5s of the object side of the fifth spacer element satisfy the following condition: 5.48 ≤ R10 / d5s ≤ 5.

76.

12. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The central thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth and seventh lenses on the optical axis, and the distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element on the optical axis satisfy the following: 1.67≤(CT6+T67) / EP56≤2.

69.

13. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens, and a seventh spacer element disposed between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens. The central thickness CT7 of the seventh lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, and the spacing distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element on the optical axis satisfy the following condition: 0.94≤(CT7+CT8) / EP67≤1.

45.

14. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The radius of curvature R13 of the object side of the seventh lens, the outer diameter D6m of the image side of the sixth spacer element, and the inner diameter d6m of the image side of the sixth spacer element satisfy the following condition: 1.28≤R13 / (D6m-d6m)≤1.

63.

15. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a seventh spacer element disposed between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens. The inner diameter d7s of the object side of the seventh spacer element and the radius of curvature R14 of the image side of the seventh lens satisfy the following condition: 1.36≤d7s / R14≤1.

71.

16. The optical imaging lens according to claim 1, characterized in that, The distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the maximum axial thickness CP1 of the first spacer element satisfy the following: 3.64≤EP01 / (T12+CP1)≤4.

91.

17. The optical imaging lens according to any one of claims 1 to 16, characterized in that, The first lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the second lens has negative optical power, its object-side surface is convex, and its image-side surface is concave; the seventh lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the eighth lens has negative optical power, its object-side surface is convex, and its image-side surface is concave.

18. The optical imaging lens according to any one of claims 1 to 16, characterized in that, The third lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the fourth lens has negative optical power, its object-side surface is concave, and its image-side surface is convex; the fifth lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the sixth lens has positive optical power, its object-side surface is convex, and its image-side surface is concave.

Images