Optical imaging lens

Abstract

The utility model provides an optical imaging lens, the number of the optical imaging lens is eight, the optical imaging lens comprises a lens group, a spacing element group and a lens barrel group, the effective focal length f4 of the fourth lens and the interval EP34 between the third spacing element and the fourth spacing element in the direction of the optical axis of the optical imaging lens meet the condition that f4 / EP34 is greater than or equal to-10.62 and less than or equal to-5.20; the curvature radius R8 of the image side face of the fourth lens, the outer diameter D4s of the object side face of the fourth spacing element and the inner diameter d4s of the object side face of the fourth spacing element meet the condition that R8 / (D4s-d4s) is larger than or equal to 0.87 and smaller than or equal to 1.65. The multi-group optical imaging lens solves the problems that the middle group of the multi-group optical imaging lens in the prior art is unstable and the stray light is serious.

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] Periscope telephoto lenses have revolutionized the placement of conventional telephoto lenses, overcoming the size-constrained magnification limitations. As portable devices become increasingly thinner and smaller, the size limitations of periscope telephoto lenses have been further reduced. However, in multi-group optical imaging lenses, the fourth lens, with its significant surface tilt, exhibits greater curvature and edge thickness, which is detrimental to its fabrication and the overall stability of the optical imaging lens assembly. Furthermore, the extended light path reflected from the image side of the eighth lens in a multi-group optical imaging lens re-passes through the fourth lens, resulting in poor blocking of this stray light. Therefore, controlling the dimensions of the fourth lens and spacer elements in the optical imaging lens to ensure both the fabrication and assembly stability of the fourth lens while blocking stray light and improving image quality is a crucial issue. Utility Model Content

[0003] The main objective of this invention is to provide an optical imaging lens to solve the problems of unstable central assembly and severe stray light in existing multi-group optical imaging lenses.

[0004] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens is provided. The optical imaging lens has eight lenses with optical power. The optical imaging lens includes: a lens group, comprising, from the object side to the image side of the optical imaging lens, a first lens to an eighth lens arranged sequentially at intervals; a spacer element group, comprising at least a third spacer element located between a third lens and a fourth lens and at least partially in contact with the image side of the third lens, and a fourth spacer element located between a fourth lens and a fifth lens and at least partially in contact with the image side of the fourth lens; and a lens barrel group, wherein the lens group and the spacer element group are housed within the lens barrel group, and the lens barrel group covers, from the object side to the image side of the optical imaging lens. The lens comprises four lens tubes arranged in sequence at intervals. The first lens is housed in the first lens tube, the second lens in the second lens tube, the third to fifth lenses in the third lens tube, and the sixth to eighth lenses in the fourth lens tube. The effective focal length f4 of the fourth lens and the interval EP34 between the third and fourth spacers along the optical axis of the lens satisfy the following: -10.62≤f4 / EP34≤-5.20. 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, and the inner diameter d4s of the object side of the fourth spacer satisfy the following: 0.87≤R8 / (D4s-d4s)≤1.65.

[0005] According to another aspect of the present invention, an optical imaging lens is provided, the optical imaging lens having eight lenses of optical power, the optical imaging lens comprising: a lens group, the lens group comprising, from the object side to the image side of the optical imaging lens, a first lens to an eighth lens arranged at intervals; a spacer element group, the spacer element group comprising at least a third spacer element located between a third lens and a fourth lens and at least partially in contact with the image side of the third lens, and a fourth spacer element located between a fourth lens and a fifth lens and at least partially in contact with the image side of the fourth lens; and a lens barrel group, the lens group and the spacer element group being housed within the lens barrel group, the lens barrel group comprising, from the object side to the image side of the optical imaging lens, a first lens barrel to a fourth lens barrel arranged at intervals. The first lens is housed in the first lens barrel, the second lens is housed in the second lens barrel, the third to fifth lenses are housed in the third lens barrel, and the sixth to eighth lenses are housed in the fourth lens barrel. The distance EP303 between the object-side end face of the third lens barrel and the third spacer element along the optical axis, and the effective focal length f3 of the third lens satisfy the following: 7.93 ≤ f3 / EP303 ≤ 14.84. The outer diameter D30s of the object-side end face of the third lens barrel, the inner diameter d30s of the object-side end face of the third lens barrel, the outer diameter D30m of the image-side end face of the third lens barrel, and the inner diameter d30m of the image-side end face of the third lens barrel satisfy the following: 2.72 ≤ (D30m - d30m) / (D30s - d30s) ≤ 6.81.

[0006] Furthermore, the effective focal length f1 of the first lens and the distance L10 from the object-side end face of the first lens barrel to the image-side end face of the first lens barrel along the optical axis satisfy the following condition: 38.26≤f1 / L10≤53.56.

[0007] Furthermore, the outer diameter D10s of the object-side end face of the first lens barrel, the inner diameter d10s of the object-side end face of the first lens barrel, and the radius of curvature R1 of the object-side surface of the first lens satisfy the following condition: 18.08≤R1 / (D10s-d10s)≤28.09.

[0008] Furthermore, the radius of curvature R2 of the image side surface of the first lens, the refractive index N1 of the first lens, and the outer diameter D10m of the image side end face of the first lens tube satisfy the following condition: -19.65≤R2 / (D10m×N1)≤-15.84.

[0009] Furthermore, the inner diameter d20s of the object-side end face of the second lens tube and the radius of curvature R3 of the object-side surface of the second lens satisfy the following condition: -7.87≤R3 / d20s≤-4.50.

[0010] Furthermore, the radius of curvature R4 of the image side of the second lens and the outer diameter D20m of the image side end face of the second lens tube satisfy the following condition: -40.09≤R4 / D20m≤-8.75.

[0011] Furthermore, the effective focal length f2 of the second lens and the distance L20 from the object-side end face of the second lens tube to the image-side end face of the second lens tube along the optical axis satisfy the following condition: -92.03≤f2 / L20≤-78.10.

[0012] Furthermore, the outer diameter D30s of the object-side end face of the third lens tube, the inner diameter d30s of the object-side end face of the third lens tube, the outer diameter D30m of the image-side end face of the third lens tube, and the inner diameter d30m of the image-side end face of the third lens tube satisfy the following condition: 2.72≤(D30m-d30m) / (D30s-d30s)≤6.81.

[0013] Furthermore, the distance EP303 between the object-side end face of the third lens tube and the third spacer element along the optical axis, and the effective focal length f3 of the third lens satisfy the following condition: 7.93≤f3 / EP303≤14.84.

[0014] Furthermore, the radius of curvature R6 of the image side of the third lens and the inner diameter d3s of the object side of the third spacer element satisfy the following condition: -4.84≤R6 / d3s≤-4.02.

[0015] Furthermore, the outer diameter D3s of the object side of the third spacer element, the radius of curvature R5 of the object side of the third lens, and the center thickness CT3 of the third lens on the optical axis satisfy the following condition: 1.06≤R5×CT3 / D3s≤1.52.

[0016] Furthermore, the central thickness CT4 of the fourth lens on the optical axis and the air gap T45 between the fourth and fifth lenses on the optical axis satisfy the following condition: 1.25≤T45 / CT4≤1.85.

[0017] Furthermore, the spacer group also includes a sixth spacer element located between the sixth lens and the seventh lens and in at least partial contact with the image side of the sixth lens. The radius of curvature R13 of the object side of the seventh lens and the inner diameter d6m of the image side of the sixth spacer element satisfy the following: -1.78≤R13 / d6m≤-1.07.

[0018] Furthermore, the spacer group also includes a seventh spacer element located between the seventh lens and the eighth lens and in at least partial 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: 1.12≤R14 / d7s≤2.85.

[0019] Furthermore, the first lens has positive optical power, and both its object-side surface and image-side surface are convex. The second lens has negative optical power, and both its object-side surface and image-side surface are convex. The third lens has positive optical power, and both its object-side surface and image-side surface are convex. The fourth lens has negative optical power, and both its object-side surface and image-side surface are convex. The fifth lens has positive optical power, and both its object-side surface and image-side surface are convex. The sixth lens has positive optical power, and both its object-side surface and image-side surface are convex. The seventh lens has negative optical power, and both its object-side surface and image-side surface are concave. The eighth lens has a concave image-side surface.

[0020] Applying the technical solution of this utility model, the optical imaging lens has eight lenses with optical power. The optical imaging lens includes a lens group, a spacer element group, and a lens barrel group. From the object side to the image side of the optical imaging lens, the lens group includes a first lens to an eighth lens arranged in sequence at intervals. The spacer element group includes at least a third spacer element located between the third and fourth lenses and at least partially in contact with the image side of the third lens, and a fourth spacer element located between the fourth and fifth lenses and at least partially in contact with the image side of the fourth lens. The lens group and the spacer element group are housed within the lens barrel group. From the object side to the image side of the optical imaging lens, the lens barrel group includes a first lens to an eighth lens arranged in sequence at intervals. The first lens is housed in the first lens barrel, the second lens is housed in the second lens barrel, the third to fifth lenses are housed in the third lens barrel, and the sixth to eighth lenses are housed in the fourth lens barrel. The effective focal length f4 of the fourth lens and the spacing EP34 between the third and fourth spacers along the optical axis of the imaging lens satisfy the following condition: -10.62 ≤ f4 / EP34 ≤ -5.20. 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, and the inner diameter d4s of the object-side surface of the fourth spacer satisfy the following condition: 0.87 ≤ R8 / (D4s-d4s) ≤ 1.65.

[0021] The optical imaging lens of this application uses eight lenses with optical power, arranged sequentially from the first to the eighth lens at intervals. Specifically, the multi-group optical imaging lens of this application uses four lens barrels to divide it into four groups. The first lens is housed in the first lens barrel, the second lens in the second lens barrel, the third to fifth lenses in the third lens barrel, and the sixth to eighth lenses in the fourth lens barrel, thereby achieving a significant increase in the magnification of the optical imaging lens. In the optical imaging lens, the fourth lens has a relatively large local slope, meaning that the direction of light changes significantly after passing through the fourth lens. Simultaneously, the edge thickness of the fourth lens increases with its focal length, making it difficult to manufacture and prone to instability during assembly in the optical imaging lens. By limiting f4 / EP34 within a reasonable range, the degree of light deflection by the fourth lens can be effectively controlled, achieving good light control. At the same time, limiting the edge thickness of the fourth lens reasonably facilitates manufacturing and assembly, ensuring the imaging quality of the optical imaging lens. However, the extended light path reflected from the image side of the eighth lens will pass through the fourth lens again. The effective diameter of the fourth lens carries a high risk of further propagating stray light, which affects image quality. By limiting R8 / (D4s-d4s), the radius of curvature of the image side of the fourth lens and the size of the fourth spacer element can be controlled. This effectively limits the inner diameter of the fourth spacer element, reducing stray light without affecting light propagation. Simultaneously, the reasonable ring width of the fourth spacer element ensures the stability of the fourth and fifth lenses, improving the image sharpness of the optical imaging lens. Attached Figure Description

[0022] 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:

[0023] Figure 1 A schematic diagram showing partial parameters of an optical imaging lens according to any alternative embodiment of the present invention is provided.

[0024] Figure 2 A schematic diagram of the structure of the optical imaging lens according to Embodiment 1 of this utility model is shown;

[0025] Figure 3 A schematic diagram of the structure of the optical imaging lens of Embodiment 2 of this utility model is shown;

[0026] 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 are shown respectively.

[0027] Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiment 3 of this utility model is shown;

[0028] Figure 9 A schematic diagram of the structure of the optical imaging lens of Embodiment 4 of this utility model is shown;

[0029] 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 3 are shown respectively.

[0030] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 5 of this utility model is shown;

[0031] Figure 15 A schematic diagram of the structure of the optical imaging lens of Embodiment Six of this utility model is shown;

[0032] 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 5 are shown respectively.

[0033] Figure 20 A schematic diagram of the structure of the optical imaging lens of Embodiment Seven of this utility model is shown;

[0034] Figure 21 A schematic diagram of the structure of the optical imaging lens of Embodiment 8 of this utility model is shown;

[0035] 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 7 are shown respectively.

[0036] Figures 26 to 27 The stray light path diagram and stray light energy intensity distribution diagram of the optical imaging lens under the conditions of f4 / EP34=-5.82 and R8 / (D4s-d4s)=0.87 are shown respectively in an optional embodiment of the present invention.

[0037] Figures 28 to 29 The stray light path diagram and stray light energy intensity distribution diagram of the optical imaging lens under the conditions of f4 / EP34=-5.82 and R8 / (D4s-d4s)=2.0 are shown respectively.

[0038] Figures 30 to 31 The stray light path diagram and stray light energy intensity distribution diagram of the optical imaging lens under the conditions of f4 / EP34=-5.82 and R8 / (D4s-d4s)=0.5 are shown respectively.

[0039] The above figures include the following reference numerals:

[0040] P10, First lens barrel; P20, Second lens barrel; P30, Third lens barrel; P40, Fourth lens barrel; E1, First lens; E2, Second lens; E3, Third lens; P3, Third spacer element; E4, Fourth lens; P4, Fourth spacer element; E5, Fifth lens; E6, Sixth lens; P6, Sixth spacer element; E7, Seventh lens; P7, Seventh spacer element; E8, Eighth lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; S5, Image-side surface of the second lens. S6, image-side of the second lens; S12, object-side of the third lens; S13, image-side of the third lens; S14, object-side of the fourth lens; S15, image-side of the fourth lens; S16, object-side of the fifth lens; S17, image-side of the fifth lens; S19, object-side of the sixth lens; S20, image-side of the sixth lens; S21, object-side of the seventh lens; S22, image-side of the seventh lens; S23, object-side of the eighth lens; S24, image-side of the eighth lens. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that 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 that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, 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 convexity or concavity. For the eye-side surface, 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 display-side surface, 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.

[0047] To address the problems of unstable central assembly and severe stray light in existing multi-group optical imaging lenses, this invention provides an optical imaging lens.

[0048] First Implementation Method

[0049] like Figures 1 to 27 As shown, the optical imaging lens has eight lenses with optical power. The optical imaging lens includes a lens group, a spacer element group, and a lens barrel group. From the object side to the image side of the optical imaging lens, the lens group includes a first lens to an eighth lens arranged in sequence at intervals. The spacer element group includes at least a third spacer element located between the third and fourth lenses and in at least partial contact with the image side of the third lens, and a fourth spacer element located between the fourth and fifth lenses and in at least partial contact with the image side of the fourth lens. The lens group and the spacer element group are housed within the lens barrel group. From the object side to the image side of the optical imaging lens, the lens barrel group includes a first lens barrel to a fourth lens barrel arranged in sequence at intervals. The lens is housed in a first lens barrel, a second lens barrel, a third to fifth lens barrel, and a sixth to eighth lens barrel. The effective focal length f4 of the fourth lens and the spacing EP34 between the third and fourth spacers along the optical axis of the lens satisfy the following: -10.62 ≤ f4 / EP34 ≤ -5.20. 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, and the inner diameter d4s of the object-side surface of the fourth spacer satisfy the following: 0.87 ≤ R8 / (D4s-d4s) ≤ 1.65.

[0050] The optical imaging lens of this application uses eight lenses with optical power, arranged sequentially from the first to the eighth lens at intervals. Specifically, the multi-group optical imaging lens of this application uses four lens barrels to divide it into four groups. The first lens is housed in the first lens barrel, the second lens in the second lens barrel, the third to fifth lenses in the third lens barrel, and the sixth to eighth lenses in the fourth lens barrel, thereby achieving a significant increase in the magnification of the optical imaging lens. In the optical imaging lens, the fourth lens has a relatively large local slope, meaning that the direction of light changes significantly after passing through the fourth lens. Simultaneously, the edge thickness of the fourth lens increases with its focal length, making it difficult to manufacture and prone to instability during assembly in the optical imaging lens. By limiting f4 / EP34 within a reasonable range, the degree of light deflection by the fourth lens can be effectively controlled, achieving good light control. At the same time, limiting the edge thickness of the fourth lens reasonably facilitates manufacturing and assembly, ensuring the imaging quality of the optical imaging lens. However, the extended light path reflected from the image side of the eighth lens will pass through the fourth lens again. The effective diameter of the fourth lens carries a high risk of further propagating stray light, which affects image quality. By limiting R8 / (D4s-d4s), the radius of curvature of the image side of the fourth lens and the size of the fourth spacer element can be controlled. This effectively limits the inner diameter of the fourth spacer element, reducing stray light without affecting light propagation. Simultaneously, the reasonable ring width of the fourth spacer element ensures the stability of the fourth and fifth lenses, improving the image sharpness of the optical imaging lens.

[0051] Table 1 below shows the stray light distribution of the optical imaging lenses of Option 1 of this application and Options 2 and 3 in the prior art under the condition of f4 / EP34=-5.82 with different values ​​of R8 / (D4s-d4s). In the stray light energy intensity distribution diagram, the X and Y axes represent the spatial position of the imaging surface, showing the energy distribution peak position of the stray light on the imaging surface. The color intensity represents the strength of the stray light energy, that is, the luminous flux of the stray light per square millimeter on the imaging surface (unit: FLUX / sq-MM).

[0052] Table 1

[0053] Scheme Number 1 2 3 f4 / EP34 -5.82 -5.82 -5.82 R8 / (D4s-d4s) 0.87 2.0 0.5 stray light path diagram Appendix Figure 26 Appendix Figure 28 Appendix Figure 30 stray light energy intensity distribution map Appendix Figure 27 Appendix Figure 29 Appendix Figure 31

[0054] Optical imaging lenses as shown in Scheme 2 and Scheme 3 are existing technologies. In Scheme 2, when f4 / EP34 = -5.82 and R8 / (D4s-d4s) = 2.0, the light distribution is as follows: Figure 28 and Figure 29As shown, when R8 / (D4s-d4s) is too large, the highest energy intensity of stray light on the imaging plane of the optical imaging lens can reach 1.2E-6 (FLUX / sq-MM), resulting in high stray light energy and low image sharpness. In Scheme 3, with f4 / EP34 = -5.82 and R8 / (D4s-d4s) = 0.5, the light distribution is as follows... Figure 30 and Figure 31 As shown, when the value of R8 / (D4s-d4s) is too small, the maximum energy intensity of stray light on the imaging surface of the optical imaging lens is as high as 1.4E-6 (FLUX / sq-MM), which seriously affects the imaging quality.

[0055] The optical imaging lens shown in Scheme 1 is an embodiment of this application. In Scheme 1, when f4 / EP34 = -5.82 and R8 / (D4s-d4s) = 0.87, the stray light distribution is as follows: Figure 26 and Figure 27 As shown, the optical imaging lens of this application produces clear images, reduces aberrations, and significantly lowers stray light energy.

[0056] In this embodiment, the effective focal length f1 of the first lens and the distance L10 from the object-side end face of the first lens barrel to the image-side end face of the first lens barrel along the optical axis satisfy the following condition: 38.26 ≤ f1 / L10 ≤ 53.56. If the value of f1 / L10 is too large, the effective focal length of the first lens will be too large, resulting in excessive light convergence and severe aberrations. If the value of f1 / L10 is too small, it will be difficult to gather light, reducing the imaging quality of the optical imaging lens. By limiting f1 / L10 to a reasonable range, the ratio of the effective focal length of the first lens to the distance from the object-side end face of the first lens barrel to the image-side end face of the first lens barrel along the optical axis can be reasonably configured. This constrains the effective focal length of the first lens, ensuring high imaging capability of the optical imaging lens. Simultaneously, limiting the distance from the object-side end face of the first lens barrel to the image-side end face of the first lens barrel along the optical axis helps to reduce the overall thickness of the optical imaging lens, achieving miniaturization.

[0057] In this embodiment, the outer diameter D10s of the object-side end face of the first lens barrel, the inner diameter d10s of the object-side end face of the first lens barrel, and the radius of curvature R1 of the object-side surface of the first lens satisfy the following relationship: 18.08 ≤ R1 / (D10s-d10s) ≤ 28.09. If the value of R1 / (D10s-d10s) is too large, it will easily lead to an excessively large ratio between the radius of curvature of the object-side surface of the first lens and the difference between the inner and outer diameters of the object-side end face of the first lens barrel, causing instability of the first lens barrel during assembly, thereby reducing the assembly yield of the optical imaging lens. If the value of R1 / (D10s-d10s) is too small, the light-gathering ability of the first lens is weakened, resulting in a decrease in image quality. By limiting R1 / (D10s-d10s) to a reasonable range, the assembly bearing width of the first lens barrel can be limited, which is beneficial to improving the stability of the optical imaging lens during assembly, increasing the assembly yield of the optical imaging lens, and further improving the performance of the optical imaging lens. Meanwhile, by limiting the radius of curvature of the object side surface of the first lens and the ratio of the difference between the inner and outer diameters of the object side end face of the first lens barrel, the light-gathering ability of the first lens can be increased, thereby enabling the optical imaging lens to maintain good imaging.

[0058] In this embodiment, the radius of curvature R2 of the image-side surface of the first lens, the refractive index N1 of the first lens, and the outer diameter D10m of the image-side end face of the first lens barrel satisfy the following condition: -19.65 ≤ R2 / (D10m×N1) ≤ -15.84. If the value of R2 / (D10m×N1) is too large, the outer diameter of the image-side end face of the first lens barrel will be too large, increasing the risk of stray light reflected from the imaging surface and affecting image sharpness. If the value of R2 / (D10m×N1) is too small, the refractive index of the first lens will be limited to a low level, the degree of light refraction will be weakened, the light-gathering effect will be affected, and the image quality will decrease. By limiting R2 / (D10m×N1) within a reasonable range, the refractive index of the first lens can be ensured to be appropriate, thereby ensuring that the degree of light refraction achieves a good light-gathering effect. At the same time, limiting the range of the outer diameter of the image-side end face of the first lens barrel helps to control the outer diameter size of the first lens, ensure the manufacturability of the first lens, and ultimately ensure the imaging quality of the optical imaging lens.

[0059] In this embodiment, the inner diameter d20s of the object-side end face of the second lens barrel and the radius of curvature R3 of the object-side surface of the second lens satisfy the following relationship: -7.87 ≤ R3 / d20s ≤ -4.50. If the value of R3 / d20s is too large, the inner diameter of the object-side end face of the second lens barrel will be too large, thus affecting the size of the second lens barrel and hindering the miniaturization of the optical imaging lens and its integration with the module. If the value of R3 / d20s is too small, the inner diameter of the object-side end face of the second lens barrel will be too small, thus affecting the effective propagation of light and resulting in a decrease in image quality. By limiting R3 / d20s to a reasonable range, it can be ensured that the effective light size entering the object-side surface of the second lens and the inner diameter of the object-side end face of the second lens barrel are maintained at a suitable ratio. This is beneficial for controlling the inner diameter of the object-side end face of the second lens barrel, thereby indirectly ensuring the outer diameter of the object-side end face of the second lens barrel. This is beneficial for the miniaturization of the optical imaging lens, while also ensuring the effective propagation of light and achieving high performance of the optical imaging lens.

[0060] In this embodiment, the radius of curvature R4 of the image-side surface of the second lens and the outer diameter D20m of the image-side end face of the second lens barrel satisfy the following relationship: -40.09 ≤ R4 / D20m ≤ -8.75. If the value of R4 / D20m is too large, it limits the lower limit of the outer diameter of the image-side surface of the second lens barrel, leading to an increased risk of stray light reflected from the imaging surface and affecting image quality. If the value of R4 / D20m is too small, it limits the upper limit of the outer diameter of the image-side end face of the second lens barrel, increasing the risk of stray light and also affecting image quality. By controlling R4 / D20m within a reasonable range, the upper and lower limits of the outer diameter of the image-side end face of the second lens barrel can be effectively controlled, preventing the second lens from reflecting light to the rear end of the optical imaging lens and generating stray light, thereby ensuring the imaging quality of the optical imaging lens.

[0061] In this embodiment, the effective focal length f2 of the second lens and the distance L20 from the object-side end face of the second lens barrel to the image-side end face of the second lens barrel along the optical axis satisfy the following condition: -92.03 ≤ f2 / L20 ≤ -78.10. If the value of f2 / L20 is too large, the distance from the object-side end face of the second lens barrel to the image-side end face of the second lens barrel along the optical axis will be too large, increasing the weight of the optical imaging lens and hindering its lightweight design. If the value of f2 / L20 is too small, the light propagation distance will be too short, the light deflection distance will be poorly controlled, affecting the light reception of subsequent lenses and ultimately leading to a decrease in image quality. By limiting f2 / L20 to a reasonable range, the distance from the object-side end face of the second lens barrel to the image-side end face of the second lens barrel along the optical axis can be effectively controlled, ensuring that the light propagation distance is within a reasonable range, thus achieving a balance between lightweight optical imaging lens and high-performance imaging.

[0062] In this embodiment, the outer diameter D30s of the object-side end face of the third lens barrel, the inner diameter d30s of the object-side end face of the third lens barrel, the outer diameter D30m of the image-side end face of the third lens barrel, and the inner diameter d30m of the image-side end face of the third lens barrel satisfy the following condition: 2.72≤(D30m-d30m) / (D30s-d30s)≤6.81. If the value of (D30m-d30m) / (D30s-d30s) is too large, the ratio of the difference between the inner and outer diameters of the object-side end face of the third lens barrel to the difference between the inner and outer diameters of the image-side end face of the third lens barrel will be too large, resulting in an unreasonable ratio between the filling area of ​​the object-side end face and the filling area of ​​the image-side end face of the third lens barrel, affecting the processability and assembly performance of the third lens barrel. If the value of (D30m-d30m) / (D30s-d30s) is too small, the ratio of the difference between the inner and outer diameters of the object-side end face and the difference between the inner and outer diameters of the image-side end face of the third lens barrel will be too small. This results in an unreasonable dimensional design of the object-side and image-side end faces of the third lens barrel, a large assembly step difference in the optical imaging lens, and reduced manufacturability of the third lens barrel. By limiting (D30m-d30m) / (D30s-d30s) to a reasonable range, the ratio of the difference between the inner and outer diameters of the object-side end face and the difference between the inner and outer diameters of the image-side end face of the third lens barrel can be ensured to be reasonable. At the same time, this ensures that the assembly step difference of the optical imaging lens is set reasonably, thus optimizing the manufacturability and assembly performance of the third lens barrel.

[0063] In this embodiment, the distance EP303 between the object-side end face of the third lens barrel and the third spacer element along the optical axis, and the effective focal length f3 of the third lens satisfy the following condition: 7.93 ≤ f3 / EP303 ≤ 14.84. If the value of f3 / EP303 is too large, the distance between the object-side end face of the third lens barrel and the third spacer element along the optical axis will be too small, affecting the molding stability of the third lens barrel and increasing the assembly difficulty. If the value of f3 / EP303 is too small, the distance required for the third lens to converge light will be too long, the light deflection distance will be unreasonably controlled, affecting the light reception of subsequent lenses, and ultimately leading to a decrease in image quality. By limiting f3 / EP303 within a reasonable range, it is possible to ensure that the center thickness of the third lens on the optical axis and the spacing between the object-side end face of the third lens barrel and the third spacer element maintain an appropriate ratio. This controls the light-gathering ability of the third lens while avoiding excessive obstruction or reflection of light by the third spacer element, ensuring that light smoothly transitions from the third lens barrel to the third spacer element and then to the subsequent lenses, achieving a good light-gathering effect. In addition, stray light is reduced, maintaining the high definition and image quality of the optical imaging lens.

[0064] In this embodiment, the radius of curvature R6 of the image-side surface of the third lens and the inner diameter d3s of the object-side surface of the third spacer element satisfy the following relationship: -4.84 ≤ R6 / d3s ≤ -4.02. If the value of R6 / d3s is too large, the ratio of the radius of curvature of the image-side surface of the third lens to the inner diameter of the object-side surface of the third spacer element is too large, increasing the risk of reflection when light enters the object-side surface of the fourth lens, ultimately affecting the image quality. If the value of R6 / d3s is too small, the ratio of the radius of curvature of the image-side surface of the third lens to the inner diameter of the object-side surface of the third spacer element is too small, resulting in a reduction in the effective light size when light enters the object-side surface of the fourth lens, affecting the effective transmission of light and leading to a decrease in image quality. By controlling R6 / d3s within a reasonable range, it can be ensured that the radius of curvature of the image-side surface of the third lens and the inner diameter of the object-side surface of the third spacer element maintain an appropriate ratio, allowing light to pass smoothly through the third spacer element after being converged by the third lens, avoiding stray light generation at the edge of the third spacer element. In addition, constraining R6 / d3s helps maintain a smooth light path, ensuring that light enters the next lens with an appropriate divergence trend, avoiding premature or over-focusing of light, thereby optimizing the imaging performance of the optical imaging lens.

[0065] In this embodiment, the outer diameter D3s of the object side of the third spacer element, the radius of curvature R5 of the object side of the third lens, and the center thickness CT3 of the third lens on the optical axis satisfy the following condition: 1.06 ≤ R5 × CT3 / D3s ≤ 1.52. If the value of R5 × CT3 / D3s is too large, the radius of curvature of the object side of the third lens and the center thickness of the third lens on the optical axis will exceed the reasonable range, resulting in excessive changes in light refraction, increasing the risk of stray light, and affecting image quality. If the value of R5 × CT3 / D3s is too small, the radius of curvature of the object side of the third lens and the center thickness of the third lens on the optical axis will be too small, resulting in insufficient changes in light refraction, leading to a decrease in the light-gathering ability of the third lens, and affecting image quality. By controlling R5×CT3 / D3s within a reasonable range, the shape and central thickness of the object-side surface of the third lens and the outer diameter of the object-side surface of the third spacer can be kept in a reasonable proportional relationship. This optimizes the light-gathering ability of the third lens and the stray light blocking effect of the third spacer, while ensuring that the third spacer has a reasonable annular width, thus guaranteeing the stable support of the third lens and the third spacer. Furthermore, constraining R5×CT3 / D3s reduces light reflection loss at the third spacer and its edges, achieving more efficient light transmission and better imaging results.

[0066] In this embodiment, the center thickness CT4 of the fourth lens on the optical axis and the air gap T45 between the fourth and fifth lenses on the optical axis satisfy the following condition: 1.25 ≤ T45 / CT4 ≤ 1.85. If the value of T45 / CT4 is too large, the air gap between the fourth and fifth lenses on the optical axis will be too large, leading to increased cost of the optical imaging lens, affecting its stability, increasing the risk of drop test failure, and impacting its reliability. If the value of T45 / CT4 is too small, the air gap between the fourth and fifth lenses on the optical axis will be too small, causing lens contact during drop tests, increasing the risk of internal damage to the optical imaging lens, and shortening its lifespan. By controlling T45 / CT4 within a reasonable range, the air gap between the fourth and fifth lenses on the optical axis can be ensured to be moderate, reducing material costs while maintaining the shock resistance of the optical imaging lens, achieving a balance between low cost and high performance. Furthermore, the T45 / CT4 can optimize the light transmission path between the fourth and fifth lenses, reduce light scattering and reflection in the air gap, and improve the overall efficiency and imaging quality of the optical system.

[0067] In this embodiment, the spacer element group further includes a sixth spacer element located between the sixth lens and the seventh lens and in at least partial contact with the image-side surface of the sixth lens. The radius of curvature R13 of the object-side surface of the seventh lens and the inner diameter d6m of the image-side surface of the sixth spacer element satisfy the following relationship: -1.78 ≤ R13 / d6m ≤ -1.07. If the value of R13 / d6m is too large, the ratio of the radius of curvature of the object-side surface of the seventh lens to the inner diameter of the image-side surface of the sixth spacer element is too large, which increases the risk of stray light during the transmission of light between the sixth spacer element and the seventh lens, affecting the image quality. If the value of R13 / d6m is too small, the ratio of the radius of curvature of the object-side surface of the seventh lens to the inner diameter of the image-side surface of the sixth spacer element is too small, which reduces the effective path size of light rays during transmission between the sixth spacer element and the seventh lens, affecting the effective convergence and transmission of light rays, resulting in a decrease in image quality. By controlling R13 / d6m within a reasonable range, all light rays entering the seventh lens from the image side of the sixth spacer element are effective path rays, reducing the risk of stray light from non-effective path portions, avoiding reflection or divergence of light rays when passing through the sixth spacer element, maintaining the focusing characteristics of the light rays, thereby reducing excess light rays entering the seventh lens, indirectly reducing the risk of stray light rays caused by redundant light rays entering the eighth lens, and achieving high-quality imaging results.

[0068] In this embodiment, the spacer element group further includes a seventh spacer element located between the seventh lens and the eighth lens and in at least partial contact with the image-side surface of the seventh lens. 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 following relationship: 1.12 ≤ R14 / d7s ≤ 2.85. If the value of R14 / d7s is too large, the ratio of the radius of curvature of the image-side surface of the seventh lens to the inner diameter of the object-side surface of the seventh spacer element is too large, causing the shape of the seventh lens to not conform to the lens manufacturing specifications, affecting the lens's manufacturability and assembly performance. If the value of R14 / d7s is too small, the ratio of the radius of curvature of the image-side surface of the seventh lens to the inner diameter of the object-side surface of the seventh spacer element is too small, causing the inner diameter of the object-side surface of the seventh spacer element to not conform to the effective light beam size limit, affecting the effective propagation of light, thereby affecting the imaging quality. By controlling R14 / d7s within a reasonable range, it can be ensured that the shape of the seventh lens conforms to the lens manufacturing specifications, while ensuring that the inner diameter of the object side of the seventh spacer element conforms to the effective light size limit, thereby optimizing lens manufacturability and ensuring effective light propagation, and maintaining image quality.

[0069] Optionally, the optical imaging lens in the embodiments of this application can be simulated using software and / or tools such as ZEMAX and CODEV. Alternatively, the optical imaging lens can be simulated using CODEV software. During the simulation process using software and / or tools as described above, the surface profile of each lens can be appropriately adjusted based on the surface profile of the software and / or tools used.

[0070] 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.

[0071] 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.

[0072] Second Implementation Method

[0073] like Figures 1 to 27As shown, the optical imaging lens has eight lenses with optical power. The optical imaging lens includes a lens group, a spacer element group, and a lens barrel group. From the object side to the image side of the optical imaging lens, the lens group includes a first lens to an eighth lens arranged in sequence at intervals. The spacer element group includes at least a third spacer element located between the third and fourth lenses and at least partially in contact with the image side of the third lens, and a fourth spacer element located between the fourth and fifth lenses and at least partially in contact with the image side of the fourth lens. The lens group and the spacer element group are housed within the lens barrel group. From the object side to the image side of the optical imaging lens, the lens barrel group includes a first lens barrel to a fourth lens barrel arranged in sequence at intervals. The first lens is housed within the first lens barrel. Inside the tube, the second lens is housed in the second tube, the third to fifth lenses are housed in the third tube, and the sixth to eighth lenses are housed in the fourth tube. The distance EP303 between the object-side end face of the third tube and the third spacer element along the optical axis, and the effective focal length f3 of the third lens, satisfy the following: 7.93 ≤ f3 / EP303 ≤ 14.84. The outer diameter D30s of the object-side end face of the third tube, the inner diameter d30s of the object-side end face of the third tube, the outer diameter D30m of the image-side end face of the third tube, and the inner diameter d30m of the image-side end face of the third tube satisfy the following: 2.72 ≤ (D30m - d30m) / (D30s - d30s) ≤ 6.81.

[0074] The optical imaging lens of this application uses eight lenses with optical power, arranged sequentially from the first to the eighth lens at intervals. Specifically, the multi-group optical imaging lens of this application uses four lens barrels to divide it into four groups. The first lens is housed in the first lens barrel, the second lens in the second lens barrel, the third to fifth lenses in the third lens barrel, and the sixth to eighth lenses in the fourth lens barrel, thereby achieving a significant increase in the magnification of the optical imaging lens. In the optical imaging lens, by limiting f3 / EP303 within a reasonable range, a good light-gathering effect is achieved while ensuring the manufacturability of the front end of the third lens barrel. However, at this point, the wall thickness of the front end of the third lens barrel is relatively small and the opening is relatively large, which is not conducive to the stable assembly of the components inside the third lens barrel. By limiting (D30m-d30m) / (D30s-d30s) to a reasonable range, the ratio of the difference between the inner and outer diameters of the object-side end face of the third lens barrel and the difference between the inner and outer diameters of the image-side end face of the third lens barrel can be ensured to be reasonable. This also ensures that the assembly step settings of the optical imaging lens are reasonable, optimizing the manufacturability and assembly performance of the third lens barrel. Furthermore, limiting (D30m-d30m) / (D30s-d30s) can also optimize the light propagation path inside the third lens barrel, ensuring effective light convergence, reducing light reflection loss at the lens barrel wall, avoiding stray light generation, thereby improving the light receiving effect of subsequent lenses and ultimately improving image quality.

[0075] It should be noted that this embodiment also includes other conditional expressions from the above embodiments, which will not be elaborated here.

[0076] Optionally, the aforementioned optical imaging lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0077] 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.

[0078] 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.

[0079] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided. Figure 1 The parameters d3s, D4s, EP34, etc., are indicated to clearly and intuitively explain 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.

[0080] 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.

[0081] It should be noted that any one of the examples in Embodiments 1 to 8 described below is applicable to all embodiments of this application.

[0082] Example 1

[0083] like Figure 2 As shown, an optical imaging lens according to Embodiment 1 of this application is described. Figure 2 A schematic diagram of the optical imaging lens of Embodiment 1 is shown.

[0084] like Figure 2As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: a first lens E1, a second lens E2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, and an eighth lens E8. Specifically, the first lens E1 is housed within the first lens barrel P10, the second lens E2 is housed within the second lens barrel P20, the third to fifth lenses E5 are housed within the third lens barrel P30, and the sixth to eighth lenses E6 are housed within the fourth lens barrel P40.

[0085] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is convex. The second lens E2 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. The third lens E3 has positive optical power, its object-side surface S12 is convex, and its image-side surface S13 is convex. The fourth lens E4 has negative optical power, its object-side surface S14 is convex, and its image-side surface S15 is concave. The fifth lens E5 has positive optical power, its object-side surface S16 is convex, and its image-side surface S17 is convex. The sixth lens E6 has positive optical power, its object-side surface S19 is concave, and its image-side surface S20 is convex. The seventh lens E7 has negative optical power, its object-side surface S21 is concave, and its image-side surface S22 is concave. The eighth lens E8 has positive optical power. The object side S23 of the eighth lens is convex, and the image side S24 of the eighth lens is concave.

[0086] Table 2 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature, thickness / distance, effective radius, and focal length are all millimeters (mm).

[0087] Table 2

[0088]

[0089]

[0090] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0091]

[0092] Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; 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 2 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspherical mirror in Example 1.

[0093] Table 3 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side surface and image-side surface of the first to eighth lenses are both aspherical.

[0094] Table 3

[0095]

[0096]

[0097] 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 field of view angles. Figure 7 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the degree to which the focal points of light of different wavelengths do not completely coincide.

[0098] according to Figures 4 to 7 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0099] Example 2

[0100] like Figure 3 The image shows an optical imaging lens according to Embodiment 2 of this application. The difference between this lens and Embodiment 1 is that the distances and thicknesses between the various spacer elements, lenses, lens barrels, etc., are different.

[0101] Figure 3A schematic diagram of the optical imaging lens of Embodiment 2 is shown. For simplicity, descriptions similar to those in Embodiment 1 are omitted. In this embodiment, the third lens and the fourth lens are fastened together. The length of the structural portion of the fourth lens is larger, and the difference between the inner and outer diameters of the fourth spacer element that it supports is increased, i.e., the annular width of the fourth spacer element is increased. This is beneficial for improving the support stability while intercepting stray light from the rear group.

[0102] Example 3

[0103] like Figure 8 As shown, an optical imaging lens according to Embodiment 3 of this application is described. Figure 8 A schematic diagram of the optical imaging lens of Embodiment 3 is shown.

[0104] like Figure 8 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: a first lens E1, a second lens E2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, and an eighth lens E8. Specifically, the first lens E1 is housed within the first lens barrel P10, the second lens E2 is housed within the second lens barrel P20, the third to fifth lenses E5 are housed within the third lens barrel P30, and the sixth to eighth lenses E6 are housed within the fourth lens barrel P40.

[0105] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is convex. The second lens E2 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. The third lens E3 has positive optical power, its object-side surface S12 is convex, and its image-side surface S13 is convex. The fourth lens E4 has negative optical power, its object-side surface S14 is convex, and its image-side surface S15 is concave. The fifth lens E5 has positive optical power, its object-side surface S16 is convex, and its image-side surface S17 is convex. The sixth lens E6 has positive optical power, its object-side surface S19 is concave, and its image-side surface S20 is convex. The seventh lens E7 has negative optical power, its object-side surface S21 is concave, and its image-side surface S22 is concave. The eighth lens E8 has negative optical power. The object side S23 of the eighth lens is convex, and the image side S24 of the eighth lens is concave.

[0106] Table 4 shows the basic structural parameters of the optical imaging lens of Embodiment 3, where the units for radius of curvature, thickness / distance, effective radius and focal length are all millimeters (mm).

[0107] Table 4

[0108] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless S1 aspherical 27.2426 0.9368 1.55 56.1 0.0000 S2 aspherical -311.9797 2.2312 0.0000 S3 spherical endless 4.8000 S4 spherical endless 1.9854 S5 aspherical -34.8681 0.5700 1.67 20.4 0.0000 S6 aspherical -77.9136 0.8806 97.6491 S7 spherical endless 0.0000 S8 spherical endless -5.8960 S9 spherical endless 5.8960 S10 spherical endless 0.6500 S11 spherical endless -0.3587 S12 aspherical 9.6310 1.1052 1.55 56.1 1.7681 S13 aspherical -27.5067 0.2049 0.0000 S14 aspherical 5.0213 0.5930 1.64 23.5 -2.3483 S15 / STO aspherical 2.9520 1.0967 -1.0504 S16 aspherical 21.3922 1.2740 1.55 56.1 13.9484 S17 aspherical -8.4222 1.5100 1.5974 S18 spherical endless 0.0133 S19 aspherical -7.2835 1.2000 1.67 20.4 0.0000 S20 aspherical -4.9159 0.1621 0.6781 S21 aspherical -8.1088 0.7474 1.55 56.1 3.9422 S22 aspherical 15.3332 0.4991 11.4349 S23 aspherical 10.1554 1.1008 1.55 56.1 -41.9770 S24 aspherical 7.2996 6.2866 2.5523 S25 spherical endless -0.0133 S26 spherical endless 0.2100 1.52 64.2 S27 spherical endless 1.5274 S28 spherical endless

[0109] Table 5 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side surface and image-side surface of the first to eighth lenses are both aspherical.

[0110] Table 5

[0111] Face number A4 A6 A8 A10 A12 A14 A16 S1 3.2968E-02 1.7008E-02 3.6592E-03 5.5743E-04 1.0376E-04 -4.3661E-07 1.6590E-05 S2 5.7181E-02 1.6931E-02 3.6218E-03 4.8759E-04 1.3588E-04 -6.7562E-06 3.2701E-05 S5 8.4114E-02 -1.0710E-03 -1.8808E-03 -3.8747E-05 -6.5233E-05 5.4150E-05 2.5389E-05 S6 9.0501E-02 -1.1299E-03 -1.6654E-03 -7.8534E-05 -4.6308E-05 5.2151E-05 2.4524E-05 S12 3.8011E-02 -2.9656E-02 1.1749E-03 -2.3293E-04 2.0637E-04 1.1147E-04 1.5626E-04 S13 1.5342E-01 -5.4749E-02 1.2889E-02 -3.5945E-03 1.1688E-03 -2.9754E-04 7.0374E-04 S14 -5.0420E-01 3.0412E-02 7.6250E-03 -2.6958E-03 7.5116E-04 -1.7075E-04 2.0754E-04 S15 -5.5305E-01 4.5661E-02 -2.7419E-03 1.2996E-03 -2.8191E-05 3.7317E-04 1.1150E-04 S16 -4.2129E-02 -1.4781E-02 3.4293E-04 1.5640E-03 5.6718E-04 2.1835E-04 3.0402E-05 S17 7.4464E-04 -6.0827E-03 -5.7642E-04 3.9786E-04 2.6328E-04 7.2894E-05 4.7205E-05 S19 3.3048E-01 -2.4333E-02 1.9819E-03 -1.2992E-03 3.9905E-04 -1.7295E-04 1.3266E-04 S20 3.7704E-01 -8.1433E-04 1.7861E-03 -4.5832E-03 2.4818E-03 -1.1643E-03 1.0785E-03 S21 -1.4398E-01 1.1592E-01 -1.7059E-02 -7.7256E-04 2.3532E-03 -1.4851E-03 1.3179E-03 S22 -5.7960E-01 1.3027E-01 -2.5567E-02 6.2897E-03 -7.1294E-04 3.6151E-04 4.8720E-05 S23 -8.3843E-01 3.7906E-02 -1.0738E-02 1.7945E-03 -1.3360E-04 3.6377E-04 -3.4670E-05 S24 -1.0366E+00 5.5779E-02 -1.1726E-02 1.3284E-03 -3.4114E-04 1.0560E-04 -7.0282E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.3896E-06 6.9618E-06 -3.4116E-06 9.8154E-06 -6.4962E-06 0.0000E+00 0.0000E+00 S2 -1.9028E-06 1.0792E-05 -3.7600E-06 9.2404E-06 -9.8863E-06 1.1469E-06 0.0000E+00 S5 3.4996E-05 8.9280E-06 1.5404E-05 5.6933E-06 9.3865E-06 0.0000E+00 0.0000E+00 S6 3.1611E-05 1.4230E-05 1.8537E-05 -1.1741E-06 9.1734E-06 0.0000E+00 0.0000E+00 S12 -1.1086E-04 -2.6934E-05 2.3372E-05 -1.2363E-05 4.6225E-06 0.0000E+00 0.0000E+00 S13 -6.0838E-04 2.0402E-04 -4.6486E-05 1.6360E-05 -1.2489E-05 7.6548E-06 -1.6601E-06 S14 -8.6939E-04 4.6721E-04 -5.5991E-05 8.6734E-06 -1.3859E-05 1.1088E-05 -4.6097E-06 S15 -4.1181E-04 1.1701E-04 -6.8019E-06 6.2606E-06 -3.2774E-06 1.3854E-06 -1.9351E-07 S16 -1.8043E-04 -2.7867E-05 6.8906E-06 1.2570E-05 0.0000E+00 0.0000E+00 0.0000E+00 S17 -5.5664E-05 -6.6873E-06 -4.0874E-06 3.9487E-06 4.5145E-07 0.0000E+00 0.0000E+00 S19 -5.7281E-05 4.5562E-05 -1.1697E-05 7.1359E-06 -3.9386E-06 6.0513E-07 0.0000E+00 S20 -5.2077E-04 3.5049E-04 -1.5476E-04 6.3650E-05 -5.6106E-05 1.8275E-05 1.4834E-06 S21 -7.3311E-04 4.7098E-04 -2.3649E-04 9.2907E-05 -7.6769E-05 3.0502E-05 0.0000E+00 S22 -9.0869E-05 3.7441E-05 -5.6049E-05 2.6432E-06 -2.5068E-05 0.0000E+00 0.0000E+00 S23 4.3877E-05 -5.0082E-06 -3.9957E-06 -1.4899E-06 -4.9556E-06 -2.5663E-06 7.9308E-07 S24 3.8309E-05 -1.9484E-05 4.7808E-06 -3.3141E-06 1.4703E-06 0.0000E+00 0.0000E+00

[0112] Figure 10 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 11 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 12 The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 13 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the degree to which the focal points of light of different wavelengths do not completely coincide.

[0113] according to Figures 10 to 13 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0114] Example 4

[0115] like Figure 9 As shown, an optical imaging lens according to Embodiment 4 of this application is described. The difference between this lens and Embodiment 3 is that the distances and thicknesses between the various spacer elements, lenses, lens barrels, etc., are different.

[0116] Figure 9 A schematic diagram of the optical imaging lens of Embodiment 4 is shown. For simplicity, descriptions similar to those in Embodiment 3 are omitted. In this embodiment, the thickness of the fourth lens structure is increased, which helps to ensure assembly stability while blocking stray light from the rear assembly. Furthermore, in the fourth lens barrel, the sixth and seventh lenses are interlocked, mutually restraining each other to improve the assembly stability of the optical imaging lens.

[0117] Example 5

[0118] like Figure 14 As shown, an optical imaging lens according to Embodiment 5 of this application is described. Figure 14 A schematic diagram of the optical imaging lens of Embodiment 5 is shown.

[0119] like Figure 14As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: a first lens E1, a second lens E2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, and an eighth lens E8. Specifically, the first lens E1 is housed within the first lens barrel P10, the second lens E2 is housed within the second lens barrel P20, the third to fifth lenses E5 are housed within the third lens barrel P30, and the sixth to eighth lenses E6 are housed within the fourth lens barrel P40.

[0120] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is convex. The second lens E2 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. The third lens E3 has positive optical power, its object-side surface S12 is convex, and its image-side surface S13 is convex. The fourth lens E4 has negative optical power, its object-side surface S14 is convex, and its image-side surface S15 is concave. The fifth lens E5 has positive optical power, its object-side surface S16 is convex, and its image-side surface S17 is convex. The sixth lens E6 has positive optical power, its object-side surface S19 is concave, and its image-side surface S20 is convex. The seventh lens E7 has negative optical power, its object-side surface S21 is concave, and its image-side surface S22 is concave. The eighth lens E8 has negative optical power. The object side S23 of the eighth lens is convex, and the image side S24 of the eighth lens is concave.

[0121] Table 6 shows the basic structural parameters of the optical imaging lens of Embodiment 5, where the units for radius of curvature, thickness / distance, effective radius, and focal length are all millimeters (mm).

[0122] Table 6

[0123]

[0124]

[0125] Table 7 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side surface and image-side surface of the first to eighth lenses are both aspherical.

[0126] Table 7

[0127]

[0128]

[0129] Figure 16 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 5 is shown, which represents the deflection 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 5 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 5 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 19 The magnification chromatic aberration curve of the optical imaging lens in Example 5 is shown, which indicates the degree to which the focal points of light of different wavelengths do not completely overlap.

[0130] according to Figures 16 to 19 It can be seen that the optical imaging lens given in Example 5 can achieve good imaging quality.

[0131] Example 6

[0132] like Figure 15 As shown, an optical imaging lens according to Embodiment Six of this application is described. The difference between Embodiment Five and Embodiment Six is ​​that the distance and thickness between the various spacer elements, lenses, lens barrels, etc. are different.

[0133] Figure 15 A schematic diagram of the optical imaging lens of Embodiment Six is ​​shown. For simplicity, descriptions similar to those in Embodiment Five are omitted. In this embodiment, the length of the structural portions of the third to fifth lenses is shortened, which is beneficial for miniaturization of the optical imaging lens.

[0134] Example 7

[0135] like Figure 20 The image shows an optical imaging lens according to Embodiment Seven of this application. Figure 20 A schematic diagram of the optical imaging lens of Embodiment 7 is shown.

[0136] like Figure 20As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: a first lens E1, a second lens E2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, and an eighth lens E8. The first lens E1 is housed within a first lens barrel P10, the second lens E2 within a second lens barrel P20, the third to fifth lenses E5 within a third lens barrel P30, and the sixth to eighth lenses E8 within a fourth lens barrel P40. In this embodiment, the first lens E1 has positive optical power, and its object-side surface S1 and image-side surface S2 are convex. The second lens E2 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. The third lens E3 has positive optical power, with both its object-side surface S12 and image-side surface S13 being convex. The fourth lens E4 has negative optical power, with both its object-side surface S14 and image-side surface S15 being concave. The fifth lens E5 has positive optical power, with both its object-side surface S16 and image-side surface S17 being convex. The sixth lens E6 has positive optical power, with both its object-side surface S19 and image-side surface S20 being convex. The seventh lens E7 has negative optical power, with both its object-side surface S21 and image-side surface S22 being concave. The eighth lens E8 has negative optical power, with both its object-side surface S23 and image-side surface S24 being concave.

[0137] Table 8 shows the basic structural parameters of the optical imaging lens of Embodiment 7, wherein the units of radius of curvature, thickness / distance, effective radius and focal length are all millimeters (mm).

[0138] Table 8

[0139]

[0140]

[0141] Table 9 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side and image-side surfaces of the first to eighth lenses are all aspherical.

[0142] Table 9

[0143] Face number A4 A6 A8 A10 A12 A14 A16 S1 5.2965E-02 1.9522E-02 3.7283E-03 4.8764E-04 2.0030E-04 -2.4721E-05 4.2071E-05 S2 7.3663E-02 1.8962E-02 3.4568E-03 4.8209E-04 1.9560E-04 -1.9983E-05 4.1187E-05 S5 3.3237E-02 -1.1453E-03 -6.4669E-04 6.4228E-05 -4.4562E-05 1.2132E-05 -4.5429E-06 S6 3.7700E-02 -1.0646E-03 -6.1200E-04 3.1057E-05 -3.3650E-05 2.1985E-05 -2.5739E-07 S12 -1.4086E-02 -2.1974E-02 6.5249E-04 -4.0629E-04 5.9540E-04 3.4409E-04 1.4422E-04 S13 1.1652E-01 -4.1577E-02 9.0763E-03 -2.9453E-03 1.9589E-03 1.2641E-04 3.3056E-04 S14 -4.4171E-01 3.8146E-02 -9.5642E-04 -5.6091E-04 4.6472E-04 2.1536E-04 1.9967E-04 S15 -4.9673E-01 4.7713E-02 -6.4973E-03 1.8415E-03 -7.7333E-04 2.5925E-04 -4.7222E-05 S16 1.3398E-03 -1.8294E-03 1.3429E-03 8.3065E-04 -1.1897E-04 -2.2116E-05 -8.8560E-06 S17 5.0947E-02 1.2728E-02 2.6969E-03 9.1876E-04 1.3187E-04 1.4540E-05 -3.3265E-05 S19 1.9359E-01 -1.4690E-02 -3.1444E-04 -1.4304E-04 9.1513E-05 -1.8773E-05 -9.0275E-05 S20 3.3797E-01 -5.3353E-03 -1.8887E-04 2.9985E-04 2.1763E-03 -1.4504E-03 -1.8626E-04 S21 -8.2533E-02 7.2354E-02 -8.7898E-03 2.0876E-03 2.9680E-03 -2.2427E-03 -3.1229E-05 S22 -4.9349E-01 7.6860E-02 -1.0224E-02 2.5177E-03 2.1449E-03 -1.4652E-04 1.8045E-04 S23 -7.3272E-01 3.0231E-02 -2.4848E-03 7.3542E-04 2.5235E-03 3.9743E-04 1.0426E-04 S24 -6.2028E-01 6.1284E-02 -6.3464E-03 9.1953E-04 5.1101E-04 -2.1862E-04 5.1813E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 -9.6746E-06 8.3757E-06 -1.0147E-05 7.9763E-08 1.5413E-06 0.0000E+00 0.0000E+00 S2 -1.4866E-05 6.2349E-06 -1.1454E-05 4.4506E-06 1.7020E-06 -6.5860E-07 0.0000E+00 S5 -2.3061E-06 -1.0101E-05 -9.3222E-06 4.1787E-06 5.6859E-06 0.0000E+00 0.0000E+00 S6 -4.7090E-06 -1.8178E-05 -8.5347E-06 5.9530E-06 6.3513E-06 0.0000E+00 0.0000E+00 S12 -8.4529E-05 -1.0724E-04 -2.7383E-05 7.8078E-06 2.4313E-05 0.0000E+00 0.0000E+00 S13 -4.9223E-04 -1.9214E-06 -4.9007E-05 5.2352E-05 1.8387E-05 -9.4758E-06 -8.2367E-07 S14 -4.1843E-04 2.0135E-05 -3.2313E-05 3.0871E-05 1.7863E-05 -5.1861E-06 -2.4344E-06 S15 -1.2547E-04 -2.5955E-05 -8.8877E-06 7.8990E-06 9.1155E-06 8.6379E-07 -3.0151E-06 S16 -4.1572E-05 -1.1721E-05 -1.2719E-05 4.2832E-06 0.0000E+00 0.0000E+00 0.0000E+00 S17 -2.0952E-05 -8.5512E-06 -9.4322E-06 -4.9535E-06 2.9940E-06 0.0000E+00 0.0000E+00 S19 1.9036E-05 4.1722E-06 1.0631E-05 -2.9181E-06 4.1629E-06 -1.4827E-06 0.0000E+00 S20 -4.7683E-05 1.0938E-04 6.3081E-06 -8.9750E-06 8.3118E-06 -4.5971E-07 -9.4564E-07 S21 -1.1816E-04 1.1133E-04 -1.2245E-05 -1.3574E-05 1.1012E-05 -2.1724E-06 0.0000E+00 S22 -1.0499E-04 -4.6179E-05 -5.7589E-05 -2.6945E-05 -8.1866E-06 0.0000E+00 0.0000E+00 S23 -5.1414E-05 -8.8930E-05 -3.8938E-05 -2.1528E-05 0.0000E+00 0.0000E+00 0.0000E+00 S24 -3.2873E-05 1.1482E-06 8.9352E-06 7.8856E-06 4.5557E-06 0.0000E+00 0.0000E+00

[0144] Figure 22The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the deviation 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 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 24 The distortion curve of the optical imaging lens of Embodiment 7 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 25 The magnification chromatic aberration curve of the optical imaging lens in Example 7 is shown, which indicates the degree to which the focal points of light of different wavelengths do not completely overlap.

[0145] according to Figures 22 to 25 It can be seen that the optical imaging lens given in Example 7 can achieve good imaging quality.

[0146] Example 8

[0147] like Figure 21 As shown, an optical imaging lens of Embodiment 8 of this application is described. The difference between this lens and Embodiment 7 is that the distances and thicknesses between the various spacer elements, lenses, lens barrels, etc., are different.

[0148] Figure 21 A schematic diagram of the optical imaging lens of Embodiment 8 is shown. For the sake of brevity, descriptions similar to those in Embodiment 7 are omitted. In this embodiment, the increased wall thickness of the third lens barrel helps reduce the risk of stress deformation of the third to fifth lenses, ensuring the assembly stability of the optical imaging lens.

[0149] In summary, Embodiments 1 to 8 of the optical imaging lens respectively satisfy the relationships shown in Table 10.

[0150] Table 10

[0151] Conditional / Example 1 2 3 4 5 6 7 8 f1 / L10 38.26 53.56 48.88 48.88 47.56 48.91 48.36 48.36 R1 / (D10s-d10s) 24.57 18.08 23.77 24.54 28.09 27.40 18.33 24.50 R2 / (D10m×N1) -16.39 -15.84 -19.65 -17.91 -17.75 -18.22 -17.96 -18.60 R3 / d20s -4.75 -4.76 -4.50 -4.50 -7.31 -7.87 -7.40 -7.40 R4 / D20m -9.60 -9.60 -8.75 -8.75 -20.11 -20.73 -40.09 -39.21 f2 / L20 -78.10 -78.10 -79.99 -79.99 -92.03 -92.03 -85.55 -85.55 (D30m-d30m) / (D30s-d30s) 3.67 5.48 5.83 6.81 5.76 4.47 3.90 2.72 f3 / EP303 9.00 7.93 14.84 14.84 10.59 10.59 12.37 11.24 R6 / d3s -4.77 -4.84 -4.43 -4.43 -4.80 -4.80 -4.02 -4.02 R5×CT3 / D3s 1.20 1.06 1.26 1.18 1.24 1.33 1.52 1.47 f4 / EP34 -5.20 -5.82 -10.62 -9.79 -7.85 -7.34 -7.71 -7.19 R8 / (D4s-d4s) 1.30 0.87 1.16 1.16 1.13 1.43 1.65 1.49 T45 / CT4 1.25 1.25 1.85 1.85 1.52 1.52 1.34 1.34 R13 / d6m -1.07 -1.07 -1.50 -1.51 -1.43 -1.38 -1.78 -1.74 R14 / d7s 1.14 1.12 2.80 2.85 1.78 1.75 2.45 2.49

[0152] Table 11 shows the effective focal lengths f1 to f7 of each lens in the optical imaging lenses of Examples 1 to 8, in mm.

[0153] Table 11

[0154]

[0155]

[0156] Table 12 shows some structural parameters of the optical imaging lenses of Examples 1 to 8, in mm.

[0157] Table 12

[0158] Parameters / Examples 1 2 3 4 5 6 7 8 d3s 5.97 5.89 6.21 6.21 6.75 6.75 6.28 6.28 D3s 7.72 8.72 8.42 9.02 9.02 8.42 7.62 7.92 d4s 5.30 5.29 5.68 5.68 6.00 6.00 5.65 5.65 D4s 7.52 8.62 8.22 8.22 8.82 8.22 7.42 7.62 d6m 5.48 5.46 5.39 5.38 5.67 5.87 5.66 5.77 d7s 5.26 5.36 5.48 5.38 5.40 5.50 5.66 5.56 d10s 10.46 10.47 10.12 10.16 10.56 10.23 10.05 10.04 D10s 11.57 11.97 11.27 11.27 11.67 11.37 11.60 11.20 D10m 11.57 11.97 10.27 11.27 11.67 11.37 11.60 11.20 d20s 7.70 7.70 7.74 7.74 8.50 7.90 7.70 7.70 D20m 8.90 8.90 8.90 8.90 10.10 9.80 8.90 9.10 d30s 8.20 9.20 8.90 9.50 9.50 8.90 8.08 8.38 d30m 6.73 6.73 6.72 6.73 7.33 7.33 6.73 6.73 D30s 8.76 9.76 9.36 9.98 9.96 9.36 8.56 9.36 D30m 8.80 9.80 9.40 10.00 10.00 9.40 8.60 9.40 L10 1.19 0.85 0.94 0.94 1.09 1.06 0.99 0.99 L20 1.19 1.19 1.19 1.19 1.44 1.44 1.19 1.19 EP303 1.26 1.43 0.89 0.89 1.23 1.23 1.09 1.20 EP34 1.68 1.50 1.18 1.28 1.42 1.52 1.39 1.49

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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, The optical imaging lens has eight lenses with optical power, and the optical imaging lens includes: The lens group, from the object side to the image side of the optical imaging lens, includes a first lens to an eighth lens arranged at intervals in sequence; A group of spacers, the group of spacers including at least a third spacer located between a third lens and a fourth lens and in at least partial contact with the image side surface of the third lens, and a fourth spacer located between a fourth lens and a fifth lens and in at least partial contact with the image side surface of the fourth lens; The lens barrel assembly, wherein the lens group and the spacer element group are housed within the lens barrel assembly, and from the object side to the image side of the optical imaging lens, the lens barrel assembly includes a first lens barrel to a fourth lens barrel arranged in sequence at intervals, wherein the first lens is housed within the first lens barrel, the second lens is housed within the second lens barrel, the third to the fifth lenses are housed within the third lens barrel, and the sixth to the eighth lenses are housed within the fourth lens barrel; Wherein, the effective focal length f4 of the fourth lens and the distance EP34 between the third and fourth spacers along the optical axis of the optical imaging lens satisfy the following condition: -10.62≤f4 / EP34≤-5.20; 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: 0.87≤R8 / (D4s-d4s)≤1.

65.

2. The optical imaging lens according to claim 1, characterized in that, The effective focal length f1 of the first lens and the distance L10 from the object-side end face of the first lens barrel to the image-side end face of the first lens barrel along the optical axis satisfy the following condition: 38.26≤f1 / L10≤53.

56.

3. The optical imaging lens according to claim 1, characterized in that, The outer diameter D10s of the object-side end face of the first lens barrel, the inner diameter d10s of the object-side end face of the first lens barrel, and the radius of curvature R1 of the object-side surface of the first lens satisfy the following condition: 18.08≤R1 / (D10s-d10s)≤28.

09.

4. 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 refractive index N1 of the first lens, and the outer diameter D10m of the image side end face of the first lens barrel satisfy the following condition: -19.65≤R2 / (D10m×N1)≤-15.

84.

5. The optical imaging lens according to claim 1, characterized in that, The inner diameter d20s of the object-side end face of the second lens tube and the radius of curvature R3 of the object-side surface of the second lens satisfy the following condition: -7.87≤R3 / d20s≤-4.

50.

6. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R4 of the image side of the second lens and the outer diameter D20m of the image side end face of the second lens tube satisfy the following condition: -40.09≤R4 / D20m≤-8.

75.

7. The optical imaging lens according to claim 1, characterized in that, The effective focal length f2 of the second lens and the distance L20 from the object-side end face of the second lens barrel to the image-side end face of the second lens barrel along the optical axis satisfy the following: -92.03≤f2 / L20≤-78.

10.

8. The optical imaging lens according to claim 1, characterized in that, The outer diameter D30s of the object-side end face of the third lens tube, the inner diameter d30s of the object-side end face of the third lens tube, the outer diameter D30m of the image-side end face of the third lens tube, and the inner diameter d30m of the image-side end face of the third lens tube satisfy the following condition: 2.72≤(D30m-d30m) / (D30s-d30s)≤6.

81.

9. The optical imaging lens according to claim 1, characterized in that, The distance EP303 between the object-side end face of the third lens barrel and the third spacer element along the optical axis, and the effective focal length f3 of the third lens satisfy the following condition: 7.93≤f3 / EP303≤14.

84.

10. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R6 of the image side of the third lens and the inner diameter d3s of the object side of the third spacer element satisfy the following condition: -4.84≤R6 / d3s≤-4.

02.

11. The optical imaging lens according to claim 1, characterized in that, The outer diameter D3s of the object side of the third spacer element, the radius of curvature R5 of the object side of the third lens, and the center thickness CT3 of the third lens on the optical axis satisfy the following condition: 1.06≤R5×CT3 / D3s≤1.

52.

12. The optical imaging lens according to claim 1, characterized in that, The central thickness CT4 of the fourth lens on the optical axis and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy the following condition: 1.25≤T45 / CT4≤1.

85.

13. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a sixth spacer element located between the sixth lens and the seventh lens and in at least partial contact with the image-side surface of the sixth lens, wherein the radius of curvature R13 of the object-side surface of the seventh lens and the inner diameter d6m of the image-side surface of the sixth spacer element satisfy the following: -1.78≤R13 / d6m≤-1.

07.

14. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a seventh spacer element located between the seventh lens and the eighth lens and in at least partial contact with the image side surface of the seventh lens. 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 following condition: 1.12≤R14 / d7s≤2.

85.

15. The optical imaging lens according to claim 1, characterized in that, The first lens has positive optical power, the object side of the first lens is convex, the image side of the first lens is convex, the fourth lens has negative optical power, the object side of the fourth lens is convex, the image side of the fourth lens is concave, the sixth lens has positive optical power, the object side of the sixth lens is concave, the image side of the sixth lens is convex, the seventh lens has negative optical power, the object side of the seventh lens is concave, the image side of the seventh lens is concave, and the image side of the eighth lens is concave.

16. The optical imaging lens according to claim 1, characterized in that, The second lens has negative optical power, the object side of the second lens is concave, and the image side of the second lens is convex. The third lens has positive optical power, the object side of the third lens is convex, and the image side of the third lens is convex. The fifth lens has positive optical power, the object side of the fifth lens is convex, and the image side of the fifth lens is convex.

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