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 f7 of the seventh lens and the interval EP67 between the sixth spacing element and the seventh spacing element in the direction of the optical axis of the optical imaging lens meet the following condition: f7 / EP67 is more than or equal to-8.25 and less than or equal to-6.82; the curvature radius R15 of the object side face of the eighth lens and the inner diameter d7m of the image side face of the seventh spacing element meet the condition that R15 / d7m is larger than or equal to 1.31 and smaller than or equal to 2.28. The multi-group optical imaging lens solves the problems of low rear end forming yield and serious stray light of the multi-group optical imaging lens in the prior art.

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 bottleneck. 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 seventh lens and the spacers before and after it require a well-designed spatial layout to ensure proper lens formation. Furthermore, light from multi-group optical imaging lenses is reflected and extended after passing through the image side of the eighth lens, and the bidirectional stray light from the front and rear of the rear group significantly impacts image quality. Therefore, controlling the shape of the seventh lens and the dimensions of its surrounding spacers to ensure a reasonable spatial layout of the rear group and a high yield rate for the seventh lens while simultaneously 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 low back-end forming yield 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, which includes at least a sixth spacer element located between the sixth and seventh lenses and at least partially in contact with the image side of the sixth lens, and a seventh spacer element located between the seventh and eighth lenses and at least partially in contact with the image side of the seventh lens; and a lens barrel group, in which the lens group and the spacer element group are housed. The object-side to image-side lens assembly of the head includes a first lens barrel to a fourth lens barrel arranged sequentially 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. Among them, the effective focal length f7 of the seventh lens and the interval EP67 between the sixth and seventh spacers along the optical axis of the optical imaging lens satisfy the following: -8.25≤f7 / EP67≤-6.82; the radius of curvature R15 of the object-side surface of the eighth lens and the inner diameter d7m of the image-side surface of the seventh spacer satisfy the following: 1.31≤R15 / d7m≤2.28.

[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 sequentially at intervals; a spacer element group, the spacer element group comprising at least a sixth spacer element located between the sixth and seventh lenses and at least partially in contact with the image side of the sixth lens, and a seventh spacer element located between the seventh and eighth lenses and at least partially in contact with the image side of the seventh 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, sequentially at intervals. The first to fourth lens tubes are arranged such that the first lens is housed in the first lens tube, the second lens is housed in the second lens tube, the third to fifth lenses are housed in the third lens tube, and the sixth to eighth lenses are housed in the fourth lens tube. Among them, the radius of curvature R12 of the image side of the sixth lens, the refractive index N6 of the sixth lens, and the inner diameter d6s of the object side of the sixth spacer element satisfy the following: -1.89≤R12×N6 / d6s≤-1.55; the effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the maximum thickness CP6 of the sixth spacer element along the optical axis satisfy the following: 9.95≤f6 / (CP6+CT6)≤13.98.

[0006] Furthermore, the radius of curvature R16 of the image side of the eighth lens, the outer diameter D40m of the image side end face of the fourth lens tube, and the inner diameter d40m of the image side end face of the fourth lens tube satisfy the following condition: 7.99≤R16 / (D40m-d40m)≤12.98.

[0007] Furthermore, the radius of curvature R14 of the image side of the seventh lens, the refractive index N7 of the seventh lens, the outer diameter D7m of the image side of the seventh spacer element, and the inner diameter d7m of the image side of the seventh spacer element satisfy the following condition: 31.57≤R14×N7×(D7m-d7m)≤47.64.

[0008] Furthermore, the radius of curvature R13 of the object side of the seventh lens, the outer diameter D7s of the object side of the seventh spacer element, and the inner diameter d7s of the object side of the seventh spacer element satisfy the following: -5.22≤R13 / (D7s-d7s)≤-3.22.

[0009] Furthermore, the radius of curvature R12 of the image side of the sixth lens, the refractive index N6 of the sixth lens, and the inner diameter d6s of the object side of the sixth spacer element satisfy the following: -1.89≤R12×N6 / d6s≤-1.55.

[0010] Furthermore, the effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the maximum thickness CP6 of the sixth spacer element along the optical axis satisfy the following condition: 9.95≤f6 / (CP6+CT6)≤13.98.

[0011] Furthermore, the spacer group also includes a fourth spacer located between the fourth lens and the fifth lens and in at least partial contact with the image side of the fourth lens. The effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth spacer along the optical axis, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy the following: 5.18≤f5 / (CP4+T45)≤5.97.

[0012] Furthermore, the radius of curvature R10 of the image side of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d30m of the image side end face of the third lens tube satisfy the following condition: -2.78≤R10×N5 / d30m≤-2.19.

[0013] Furthermore, the spacer group also includes a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image side of the fourth lens. The radius of curvature R9 of the object side of the fifth lens, the outer diameter D4m of the image side of the fourth spacer element, and the inner diameter d4m of the image side of the fourth spacer element satisfy the following: 4.78≤R9 / (D4m-d4m)≤6.52.

[0014] Furthermore, the spacer group also includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side of the third lens. The radius of curvature R7 of the object side of the fourth lens and the inner diameter d3m of the image side of the third spacer element satisfy the following: 1.12≤R7 / d3m≤1.58.

[0015] Furthermore, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the following condition: -4.84≤f2 / f1≤-2.37.

[0016] 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 concave, and its image-side surface is convex; 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 convex, and its image-side surface is concave; the fifth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; the sixth lens has positive optical power, its object-side surface is concave, and its image-side surface is convex; the seventh lens has negative optical power, its object-side surface is concave, 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.

[0017] 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 sequentially at intervals. The spacer element group includes at least a sixth spacer element located between the sixth and seventh lenses and at least partially in contact with the image side of the sixth lens, and a seventh spacer element located between the seventh and eighth lenses and at least partially in contact with the image side of the seventh 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... 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 f7 of the seventh lens and the interval EP67 between the sixth and seventh spacers along the optical axis of the lens satisfy the following: -8.25≤f7 / EP67≤-6.82. The radius of curvature R15 of the object side of the eighth lens and the inner diameter d7m of the image side of the seventh spacer satisfy the following: 1.31≤R15 / d7m≤2.28.

[0018] The optical imaging lens of this application uses eight lenses with optical power, arranged sequentially from the first lens 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 f7 / EP67 within a reasonable range, the spacing between the sixth and seventh spacer elements along the optical axis of the optical imaging lens and the effective focal length of the seventh lens are constrained, achieving an optimized spatial structure effect. This allows for adjustments to the shape and thickness of the effective diameter portion and structural portion of the seventh lens, improving the feasibility of shaping the seventh lens. However, at the same time, light from the multi-group optical imaging lens is reflected and extended after passing through the image side of the eighth lens. The risk of bidirectional stray light from the front and rear ends of the seventh lens passing through the effective diameter of the seventh lens is high, significantly affecting image quality. By limiting R15 / d7m within a reasonable range, the ratio of the inner diameter of the image side of the seventh spacer element to the radius of curvature of the object side of the eighth lens can be controlled, allowing light to diffuse along the planned optical path. This effectively blocks bidirectional stray light from the front and rear ends of the seventh lens, improving the imaging quality of the optical imaging lens. Attached Figure Description

[0019] 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:

[0020] Figure 1 A schematic diagram showing partial parameters of an optical imaging lens according to any alternative embodiment of the present invention is provided.

[0021] Figure 2 A schematic diagram of the structure of the optical imaging lens according to Embodiment 1 of this utility model is shown;

[0022] Figure 3 A schematic diagram of the structure of the optical imaging lens of Embodiment 2 of this utility model is shown;

[0023] 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.

[0024] Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiment 3 of this utility model is shown;

[0025] Figure 9A schematic diagram of the structure of the optical imaging lens of Embodiment 4 of this utility model is shown;

[0026] 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.

[0027] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 5 of this utility model is shown;

[0028] Figure 15 A schematic diagram of the structure of the optical imaging lens of Embodiment Six of this utility model is shown;

[0029] 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.

[0030] Figure 20 A schematic diagram of the structure of the optical imaging lens of Embodiment Seven of this utility model is shown;

[0031] Figure 21 A schematic diagram of the structure of the optical imaging lens of Embodiment 8 of this utility model is shown;

[0032] 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.

[0033] 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 f7 / EP67=-11.28 and R15 / d7m=1.33, respectively, are shown in an optional embodiment of the present invention.

[0034] 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 f7 / EP67=-11.28 and R15 / d7m=2.5 are shown respectively.

[0035] 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 f7 / EP67=-11.28 and R15 / d7m=1.15 in the prior art are shown respectively.

[0036] The above figures include the following reference numerals:

[0037] 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

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] To address the problems of low back-end forming yield and severe stray light in existing multi-group optical imaging lenses, this invention provides an optical imaging lens.

[0045] First Implementation Method

[0046] 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 a sequentially spaced manner. The spacer element group includes at least a sixth spacer element located between the sixth and seventh lenses and in at least partial contact with the image side of the sixth lens, and a seventh spacer element located between the seventh and eighth lenses and in at least partial contact with the image side of the seventh 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 sequentially spaced... The first to fourth lens tubes are arranged such that the first lens is housed in the first lens tube, the second lens is housed in the second lens tube, the third to fifth lenses are housed in the third lens tube, and the sixth to eighth lenses are housed in the fourth lens tube. Among them, the effective focal length f7 of the seventh lens and the spacing EP67 between the sixth and seventh spacers along the optical axis of the optical imaging lens satisfy the following: -8.25≤f7 / EP67≤-6.82; the radius of curvature R15 of the object side of the eighth lens and the inner diameter d7m of the image side of the seventh spacer satisfy the following: 1.31≤R15 / d7m≤2.28.

[0047] The optical imaging lens of this application uses eight lenses with optical power, arranged sequentially from the first lens 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 f7 / EP67 within a reasonable range, the spacing between the sixth and seventh spacer elements along the optical axis of the optical imaging lens and the effective focal length of the seventh lens are constrained, achieving an optimized spatial structure effect. This allows for adjustments to the shape and thickness of the effective diameter portion and structural portion of the seventh lens, improving the feasibility of shaping the seventh lens. However, at the same time, light from the multi-group optical imaging lens is reflected and extended after passing through the image side of the eighth lens. The risk of bidirectional stray light from the front and rear ends of the seventh lens passing through the effective diameter of the seventh lens is high, significantly affecting image quality. By limiting R15 / d7m within a reasonable range, the ratio of the inner diameter of the image side of the seventh spacer element to the radius of curvature of the object side of the eighth lens can be controlled, allowing light to diffuse along the planned optical path. This effectively blocks bidirectional stray light from the front and rear ends of the seventh lens, improving the imaging quality of the optical imaging lens.

[0048] 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 f7 / EP67=-11.28 with different values ​​of R15 / d7m. In the stray light energy intensity distribution diagram, the X and Y axes represent the spatial position of the imaging surface, showing the peak position of the stray light energy distribution 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).

[0049] Table 1

[0050] Scheme No. 1 2 3 f7 / EP67 -11.28 -11.28 -11.28 R15 / d7m 1.33 4.0 0.5 Stray light optical path diagram APPENDIX Figure 26 APPENDIX Figure 28 APPENDIX Figure 30 Stray light energy intensity distribution diagram APPENDIX Figure 27 APPENDIX Figure 29 APPENDIX Figure 31

[0051] Optical imaging lenses as shown in Scheme 2 and Scheme 3 are existing technologies. In Scheme 2, with f7 / EP67 = -11.28 and R15 / d7m = 2.5, the light distribution is as follows: Figure 28 and Figure 29 As shown, when R15 / d7m is too large, stray light energy is high, resulting in low image sharpness. In Scheme 3, with f7 / EP67 = -11.28 and R15 / d7m = 1.15, the light distribution is as follows... Figure 30 and Figure 31 As shown, when the value of R15 / d7m is too small, the light spot on the imaging surface of the optical imaging lens is obvious, which seriously affects the imaging quality.

[0052] The optical imaging lens shown in Scheme 1 is an embodiment of this application. In Scheme 1, when f7 / EP67 = -11.28 and R15 / d7m = 1.33, 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.

[0053] In this embodiment, the radius of curvature R16 of the image-side surface of the eighth lens, the outer diameter D40m of the image-side end face of the fourth lens barrel, and the inner diameter d40m of the image-side end face of the fourth lens barrel satisfy the following condition: 7.99 ≤ R16 / (D40m-d40m) ≤ 12.98. If the value of R16 / (D40m-d40m) is too small, the difference between the inner and outer diameters of the image-side end face of the fourth lens barrel will be large, which may easily lead to unstable assembly of the eighth lens, affecting the stability of the optical imaging lens during the assembly process, reducing the yield, and making it impossible to effectively control the stray light reflected back after the light emitted from the image-side surface of the eighth lens reaches the image-side end of the fourth lens barrel, resulting in impaired image quality. If the value of R16 / (D40m-d40m) is too large, it will not be able to sufficiently block stray light passing between the image-side end of the eighth lens and the fourth lens barrel, reducing the degree of ineffective optical path obstruction and degrading image quality. By limiting R16 / (D40m-d40m) within a reasonable range, the stability of the optical imaging lens during assembly can be improved. At the same time, the interaction between light and the image-side end face of the fourth lens barrel can be effectively controlled, reducing the risk of stray light generation and increasing the degree of stray light blocking, thereby improving the imaging quality of the optical imaging lens.

[0054] In this embodiment, the radius of curvature R14 of the image-side surface of the seventh lens, the refractive index N7 of the seventh lens, the outer diameter D7m of the image-side surface of the seventh spacer element, and the inner diameter d7m of the image-side surface of the seventh spacer element satisfy the following condition: 31.57 ≤ R14 × N7 × (D7m - d7m) ≤ 47.64. If the value of R14 × N7 × (D7m - d7m) is too large, it will weaken the manufacturability of the edge of the effective diameter of the seventh lens and the structural part of the seventh lens, affecting the stability of the assembly process. At the same time, if the width of the annular band of the image-side surface of the seventh spacer element is too large, it will block the light from the effective diameter of the seventh lens, reducing the sharpness of the image edge. If the value of R14 × N7 × (D7m - d7m) is too small, it will be impossible to effectively control the light refraction angle of the seventh lens, resulting in uneven light refraction and reduced image quality. At the same time, if the width of the annular band of the image-side surface of the seventh spacer element is too small, it will cause the seventh lens and the eighth lens to be unstable, greatly weakening the effect of blocking stray light. By controlling R14×N7×(D7m-d7m) within a reasonable range, the edge of the effective diameter of the seventh lens and the forming yield of the structural part of the seventh lens can be enhanced, ensuring that the light refraction angle is within a reasonable range. At the same time, the ring width of the image side of the seventh spacer element can be reasonably set, which improves the stability of the assembly process and the imaging quality.

[0055] In this embodiment, the radius of curvature R13 of the object-side surface of the seventh lens, the outer diameter D7s of the object-side surface of the seventh spacer element, and the inner diameter d7s of the object-side surface of the seventh spacer element satisfy the following relationship: -5.22 ≤ R13 / (D7s-d7s) ≤ -3.22. If the value of R13 / (D7s-d7s) is too large, that is, the circumferential bandwidth of the object-side surface of the seventh spacer element is too large, it will reduce the edge light transmittance from the effective path of the front lens, thereby reducing the sharpness of the image edge. At the same time, if the curvature of the object-side surface of the seventh lens is too small, it will not be conducive to the effective propagation of light. If the value of R13 / (D7s-d7s) is too small, the curvature of light passing through the object-side surface of the seventh lens will be too large, resulting in an unreasonable light refraction angle, increasing aberrations and affecting image quality. At the same time, if the circumferential bandwidth of the object-side surface of the seventh spacer element is too small, it will result in insufficient support between the structural parts of the seventh lens and the object-side surface of the seventh spacer element, affecting the assembly stability. By controlling R13 / (D7s-d7s) within a reasonable range, it is possible to ensure that the structural part of the seventh lens and the object side of the seventh spacer are sufficiently supported, while controlling the light refraction angle within a reasonable range, and ensuring that the light propagation path through the seventh lens is reasonable, thereby improving assembly stability and imaging quality.

[0056] In this embodiment, the radius of curvature R12 of the image-side surface of the sixth lens, the refractive index N6 of the sixth lens, and the inner diameter d6s of the object-side surface of the sixth spacer element satisfy the following condition: -1.89 ≤ R12 × N6 / d6s ≤ -1.55. If the value of R12 × N6 / d6s is too large, the radius of curvature and refractive index of the sixth lens cannot be effectively controlled, affecting the effective path of light transmission. Simultaneously, if the inner diameter of the sixth spacer element is too large, it cannot effectively block stray light between the sixth and seventh lenses. If the value of R12 × N6 / d6s is too small, the inner diameter of the object-side surface of the sixth spacer element is too small, which is detrimental to the transmission of edge light, affecting image quality. By limiting R12 × N6 / d6s within a reasonable range, the radius of curvature and refractive index of the image-side surface of the sixth lens can be reasonably constrained, and the inner diameter of the sixth spacer element is properly controlled, effectively blocking edge stray light propagating between the sixth and seventh lenses, thus improving image quality.

[0057] In this embodiment, the effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens along the optical axis, and the maximum thickness CP6 of the sixth spacer element along the optical axis satisfy the following condition: 9.95 ≤ f6 / (CP6+CT6) ≤ 13.98. If the value of f6 / (CP6+CT6) is too large, the sum of the maximum thickness of the sixth spacer element along the optical axis and the center thickness of the sixth lens will be too small, meaning the air gap between the sixth and seventh lenses will be too small. This is not conducive to the proper propagation of light and also leads to a decrease in light transmittance at the edges of the sixth lens, making edge rays ineffective, increasing the risk of stray light, and affecting image quality. If the value of f6 / (CP6+CT6) is too small, the air gap between the sixth and seventh lenses will be too large, resulting in uneven scattering and refraction of light between the sixth and seventh lenses, which also affects image sharpness and stability. By limiting f6 / (CP6+CT6) within a reasonable range, the air gap formed by the sixth lens and the sixth spacer element can be ensured to be reasonable, optimizing the light transmittance within the effective diameter of the sixth lens, reducing edge-damped rays, and lowering the risk of stray light, thereby improving the imaging quality and stability of the optical imaging lens. Simultaneously, by constraining the thickness of the sixth lens and the sixth spacer element to control the edge-to-thickness ratio of the sixth lens, the molding yield and assembly stability of the sixth lens can be improved.

[0058] In this embodiment, the spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image-side surface of the fourth lens. The effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the air gap T45 between the fourth and fifth lenses along the optical axis satisfy the following condition: 5.18 ≤ f5 / (CP4+T45) ≤ 5.97. If the value of f5 / (CP4+T45) is too large, the maximum thickness of the fourth spacer element along the optical axis and the air gap between the fourth and fifth lenses will be too small, which is not conducive to controlling the air gap between the fourth and fifth lenses and affects the assembly stability and reliability of the optical imaging lens. If the value of f5 / (CP4+T45) is too small, the maximum thickness of the fourth spacer element along the optical axis and the air gap between the fourth and fifth lenses will be too large, which may lead to light scattering and decreased imaging performance. By controlling f5 / (CP4+T45) within a reasonable range, the step difference between the fourth and fifth lenses can be optimized to improve the assembly stability and reliability of the lens. At the same time, the thickness of the fourth spacer element and the air gap between the fourth and fifth lenses on the optical axis can be controlled to maintain an appropriate air gap, ensuring smooth light transmission and optimizing image quality.

[0059] In this embodiment, the radius of curvature R10 of the image-side surface of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d30m of the image-side end face of the third lens barrel satisfy the following condition: -2.78 ≤ R10 × N5 / d30m ≤ -2.19. If the value of R10 × N5 / d30m is too large, excessive refraction of light rays will hinder their transmission to the rear lens group, leading to a decrease in image quality and affecting the assembly stability of the fifth lens. If the value of R10 × N5 / d30m is too small, the convergence of light rays will be insufficient, and the light rays will be easily blocked by the image-side end of the third lens barrel, which will hinder the transition of light rays to the rear. By limiting R10 × N5 / d30m within a reasonable range, the refractive index of the fifth lens and the size of the image-side surface of the third lens barrel can be effectively controlled, improving the degree of obstruction of ineffective light paths, thereby significantly improving the image quality of the optical imaging lens, ensuring that light rays propagate along the planned light path, and reducing the influence of stray light.

[0060] In this embodiment, the spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image-side surface of the fourth lens. The radius of curvature R9 of the object-side surface of the fifth lens, the outer diameter D4m of the image-side surface of the fourth spacer element, and the inner diameter d4m of the image-side surface of the fourth spacer element satisfy the following: 4.78 ≤ R9 / (D4m-d4m) ≤ 6.52. If the value of R9 / (D4m-d4m) is too large, the annular band width of the fourth spacer element is too small, which is insufficient to block the small amount of light reflected back from the structural part of the fifth lens, resulting in increased stray light and affecting image quality. At the same time, if the radius of curvature of the object-side surface of the fifth lens is too large, the light refraction angle will be too large, affecting the smooth passage of light through the effective path and reducing image sharpness. If the value of R9 / (D4m-d4m) is too small, that is, if the annular band width of the image-side surface of the fourth spacer element is too large, it will reduce the edge light transmittance from the effective path of the front lens, thereby reducing the sharpness of the image edge. At the same time, if the radius of curvature of the object-side surface of the fifth lens is too small, it will be detrimental to the effective propagation of light. By controlling R9 / (D4m-d4m) within a reasonable range, and by controlling the ratio of the radius of curvature of the object side of the fifth lens to the width of the ring band of the image side of the fourth spacer element, stray light can be effectively blocked, ensuring that the refraction angle of the light is appropriate, improving the smoothness of the effective path of the light through the fifth lens, thereby improving the imaging quality and stability during the assembly process, reducing the scattering of edge light, and optimizing the imaging performance of the optical imaging lens.

[0061] In this embodiment, the spacer element group further includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image-side surface of the third lens. The radius of curvature R7 of the object-side surface of the fourth lens and the inner diameter d3m of the image-side surface of the third spacer element satisfy the following condition: 1.12 ≤ R7 / d3m ≤ 1.58. If the value of R7 / d3m is too small, the object-side surface of the fourth lens and the image-side surface of the third spacer element cannot fully abut, resulting in decreased stability during assembly and affecting the positioning of the fourth lens. If the value of R7 / d3m is too large, the effective diameter of the object-side surface of the fourth lens will be too close to the inner diameter of the third spacer element, resulting in a restricted path for light rays through the effective diameter of the fourth lens and affecting the imaging effect. By limiting R7 / d3m within a reasonable range, it is possible to ensure stable abutment between the object-side surface of the fourth lens and the image-side surface of the third spacer element, optimizing the stability during assembly. At the same time, the appropriate radius of curvature of the object-side surface of the fourth lens ensures that light rays smoothly transition from the third lens to the fourth lens, reducing the angular deviation of light refraction and improving the imaging quality and positioning accuracy of the fourth lens.

[0062] In this embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the following condition: -4.84 ≤ f2 / f1 ≤ -2.37. If the value of f2 / f1 is too large, the difference in effective focal length between the first and second lenses is too small, making it impossible to effectively control the convergence and divergence of light, which may lead to imaging distortion and a decrease in image quality. If the value of f2 / f1 is too small, the difference in effective focal length between the first and second lenses is too large, making the optical imaging lens overly sensitive, making it difficult to fine-tune the positions of the first and second lenses during assembly, affecting the production quality and imaging performance of the optical imaging lens. By controlling f2 / f1 within a reasonable range, the sensitivity of the first and second lenses can be effectively reduced, making the assembly and adjustment process of the front-end lens easier. At the same time, it can ensure that the convergence and divergence of light are reasonably controlled, reducing image distortion, improving the production quality and imaging stability of the optical imaging lens, thereby improving the imaging performance and applicability of the optical imaging lens.

[0063] 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 concave, and its image-side surface is convex. 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 convex, and its image-side surface is concave. The fifth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex. The sixth lens has positive optical power, its object-side surface is concave, and its image-side surface is convex. The seventh lens has negative optical power, its object-side surface is concave, 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.

[0064] To optimize the transition and focusing of light between lens groups, the optical imaging lens is equipped with eight lenses. First, the first and third lenses serve as positive power lenses at the front. The object-side surfaces of the first and third lenses are convex, effectively converging the light entering the front of the optical imaging lens. Simultaneously, the image-side surfaces of the first and third lenses are concave, controlling the smoothness of light convergence and preventing excessive divergence during convergence, ensuring a smooth transition of light to the subsequent lens groups. The second and fourth lenses, as negative power lenses, have concave object-side surfaces, which diverge the light converged by the first and third lenses, preventing excessive concentration at the front and avoiding overexposure in the image center or light loss at the lens edges. At the same time, the image-side surfaces of the second and fourth lenses are convex, allowing for a degree of re-convergence of light, ensuring that the diverged light remains within the effective diameter of the optical imaging lens, creating conditions for focusing by the subsequent lens groups.

[0065] Meanwhile, the fifth and sixth lenses have positive optical power. Both the object-side and image-side surfaces of the fifth lens are convex, enhancing the focusing effect and further concentrating the light rays passing through the preceding lenses to form a clearer central image. The object-side surface of the sixth lens is concave, while its image-side surface is convex, allowing for slight focusing after light divergence, providing a wider field of view for the final image. The seventh and eighth lenses, as the rear of the optical imaging lens, have negative and positive optical power, respectively. Both the object-side and image-side surfaces of the seventh lens are concave, allowing for appropriate divergence of light after it has passed through the fifth and sixth lenses, preventing over-focusing. The eighth lens, as the last lens in the lens group, is designed with a convex-concave shape, meaning its object-side surface is convex and its image-side surface is concave. The convex object-side surface of the eighth lens effectively focuses the incoming light rays, while the concave image-side surface optimizes the focusing process, preventing the loss of edge light and ensuring the consistency and sharpness of the optical imaging lens's image.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] Second Implementation Method

[0070] 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 to an eighth lens arranged in sequence at intervals. The spacer element group includes at least a sixth spacer element located between the sixth and seventh lenses and in at least partial contact with the image side of the sixth lens, and a seventh spacer element located between the seventh and eighth lenses and in at least partial contact with the image side of the seventh 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 to a fourth lens barrel 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. Among them, the radius of curvature R12 of the image side of the sixth lens, the refractive index N6 of the sixth lens, and the inner diameter d6s of the object side of the sixth spacer element satisfy the following: -1.89≤R12×N6 / d6s≤-1.55; the effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the maximum thickness CP6 of the sixth spacer element along the optical axis satisfy the following: 9.95≤f6 / (CP6+CT6)≤13.98.

[0071] 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 R12×N6 / d6s within a reasonable range, the radius of curvature and refractive index of the image-side surface of the sixth lens can be reasonably constrained. The inner diameter of the sixth spacer element is properly controlled, effectively blocking light from entering the structural part of the sixth lens while allowing edge light to pass through, avoiding the generation and propagation of extraneous stray light and improving image quality. However, the image-side surface of the sixth lens protrudes more than the structural part, resulting in poor shaping and assembly stability of the sixth lens. By limiting f6 / (CP6+CT6) within a reasonable range, the light refraction path is controlled, the edge invalid light rays are reduced, the light transmittance within the effective diameter of the sixth lens is optimized, the risk of stray light is reduced, and the thickness of the sixth lens and the sixth spacer element is constrained to control the edge thickness ratio of the sixth lens, thereby improving the molding yield and assembly stability of the sixth lens.

[0072] It should be noted that this embodiment also includes other conditional expressions from the above embodiments, which will not be elaborated here.

[0073] Optionally, the aforementioned optical imaging lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0074] 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.

[0075] 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.

[0076] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided.Figure 1 The figures clearly indicate parameters such as d3m, D40m, and EP67 to provide a clear and intuitive 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.

[0077] 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.

[0078] 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.

[0079] Example 1

[0080] 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.

[0081] like Figure 2 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.

[0082] 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 concave. 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 concave. 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.

[0083] 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).

[0084] Table 2

[0085] Surface No. Surface Type Radius of Curvature Thickness Refractive Index Abbe Number Conic Constant OBJ Sphere Infinite Infinite S1 Asphere 15.2291 0.9296 1.55 56.1 0.0000 S2 Asphere 34.4660 2.3504 0.0000 S3 Sphere Infinite 4.8000 S4 Sphere Infinite 2.1626 S5 Asphere -20.5254 0.6500 1.67 20.4 0.0000 S6 Asphere -28.2521 1.0525 51.5819 S7 Sphere Infinite 0.0000 S8 Sphere Infinite -6.0000 S9 Sphere Infinite 6.0000 S10 Sphere Infinite 0.6500 S11 Sphere Infinite -0.5535 S12 Asphere 6.3620 1.1588 1.55 56.1 0.5545 S13 Asphere 50.9982 0.0799 -98.5000 S14 Asphere 6.6824 0.6677 1.62 25.9 -1.0717 S15 Asphere 3.1725 1.2769 -0.8678 S16 Asphere 11.4462 1.2330 1.55 56.1 7.7991 S17 Asphere -11.4141 1.6200 -7.2612 STO Sphere Infinite 0.0133 S19 Asphere -13.5501 1.2100 1.67 20.4 0.0000 S20 Asphere -5.2786 0.1000 0.8286 S21 Asphere -9.3889 0.6697 1.57 37.4 4.1279 S22 Asphere 9.8933 0.8199 4.5739 S23 Asphere 12.7116 0.9848 1.54 55.7 -98.5000 S24 Asphere 7.2908 6.0335 -1.1958 S25 Sphere Infinite -0.0133 S26 Sphere Infinite 0.2100 1.52 64.2 S27 Sphere Infinite 1.2742 S28 Sphere Infinite

[0086] 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:

[0087]

[0088] 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.

[0089] 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.

[0090] Table 3

[0091]

[0092]

[0093] 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.

[0094] according to Figures 4 to 7 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0095] Example 2

[0096] 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.

[0097] Figure 3 A 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 inner diameters of the object-side surfaces of the sixth and seventh spacers in the fourth lens barrel are reduced, which helps to intercept stray light at the rear end of the optical imaging lens and improves the imaging quality of the optical imaging lens.

[0098] Example 3

[0099] 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.

[0100] 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.

[0101] 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 concave. 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 concave. 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.

[0102] 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).

[0103] Table 4

[0104] Surface No. Surface Type Radius of Curvature Thickness Refractive Index Abbe Number Conic Constant OBJ Sphere Infinite Infinite S1 Asphere 13.0723 0.8775 1.55 56.1 0.0000 S2 Asphere 24.4490 2.4489 0.0000 S3 Sphere Infinite 4.8000 S4 Sphere Infinite 2.1568 S5 Asphere -23.4431 0.7000 1.67 20.4 0.0000 S6 Asphere -33.6400 1.0255 63.7325 S7 Sphere Infinite 0.0000 S8 Sphere Infinite 0.6500 S9 Sphere Infinite -0.5255 S12 Asphere 6.1343 1.1567 1.55 56.1 0.1709 S13 Asphere 69.1088 0.0799 91.0655 S14 Asphere 7.2470 0.6879 1.62 25.9 -0.7189 S15 Asphere 3.1626 0.9965 -0.8634 S16 Asphere 12.3386 1.3440 1.55 56.1 7.9601 S17 Asphere -10.5087 1.6500 -6.9303 STO Asphere Infinite 0.0133 S19 Asphere -12.9345 1.2000 1.67 20.4 0.0000 S20 Asphere -6.2814 0.1000 1.4451 S21 Asphere -9.9697 0.7639 1.55 56.1 5.0413 S22 Asphere 11.1574 0.8444 7.5901 S23 Asphere 7.6044 0.9442 1.54 55.7 -76.0098 S24 Asphere 5.8261 6.0376 -2.0975 S25 Sphere Infinite -0.0133 S26 Sphere Infinite 0.2100 1.52 64.2 S24 Sphere Infinite 1.2780 S25 Sphere Infinite

[0105] 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.

[0106] Table 5

[0107]

[0108]

[0109] 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.

[0110] according to Figures 10 to 13It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0111] Example 4

[0112] 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.

[0113] 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, in the fourth lens barrel, the inner diameter of the object side of the sixth spacer element is increased, which facilitates the transmission of edge light from the front lens group and improves the clarity of the optical imaging quality.

[0114] Example 5

[0115] 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.

[0116] like Figure 14 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.

[0117] 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 concave. 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 concave. 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.

[0118] 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).

[0119] Table 6

[0120]

[0121]

[0122] 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.

[0123] Table 7

[0124]

[0125]

[0126] 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.

[0127] according to Figures 16 to 19 It can be seen that the optical imaging lens given in Example 5 can achieve good imaging quality.

[0128] Example 6

[0129] 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.

[0130] Figure 15 A schematic diagram of the optical imaging lens of Embodiment Six is ​​shown. For the sake of brevity, descriptions similar to those in Embodiment Five are omitted. In this embodiment, in the fourth lens barrel, the inner diameter of the object side of the sixth spacer element is increased, which facilitates the transmission of edge light from the front lens group and improves the clarity of the optical imaging quality.

[0131] Example 7

[0132] 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.

[0133] like Figure 20 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.

[0134] 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 concave. 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 concave. 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.

[0135] 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).

[0136] Table 8

[0137] Surface No. Surface Type Radius of Curvature Thickness Refractive Index Abbe Number Conic Constant OBJ Sphere Infinite Infinite S1 Asphere 13.0857 0.9296 1.55 56.1 0.0000 S2 Asphere 24.4991 2.3504 0.0000 S3 Sphere Infinite 4.8000 S4 Sphere Infinite 2.1626 S5 Asphere -25.5012 0.6500 1.67 20.4 0.3229 S6 Asphere -30.6350 1.0525 61.5946 S7 Sphere Infinite 0.0000 S8 Sphere Infinite -6.0000 S9 Sphere Infinite 6.0000 S10 Sphere Infinite 0.6500 S11 Sphere Infinite -0.5535 S12 Asphere 6.2373 1.1588 1.55 56.1 0.1677 S13 Asphere 77.3672 0.0799 -98.5000 S14 Asphere 8.6825 0.6677 1.62 25.9 -0.3423 S15 Asphere 3.1857 1.2769 -0.8469 S16 Asphere 10.9544 1.2330 1.55 56.1 7.1331 S17 Asphere -10.2597 1.6200 -7.3359 STO Sphere Infinite 0.0133 S19 Asphere -14.5073 1.2100 1.67 20.4 0.0000 S20 Asphere -6.1479 0.1000 1.3966 S21 Asphere -9.2298 0.6697 1.57 37.4 4.2950 S22 Asphere 10.7371 0.8199 7.2130 S23 Asphere 7.7988 0.9848 1.54 55.7 -72.8841 S24 Asphere 5.9689 6.0335 -1.9006 S25 Sphere Infinite -0.0133 S26 Sphere Infinite 0.2100 1.52 64.2 S27 Sphere Infinite 1.2742 S28 Sphere Infinite

[0138] 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.

[0139] Table 9

[0140]

[0141]

[0142] Figure 22 The 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.

[0143] according to Figures 22 to 25It can be seen that the optical imaging lens given in Example 7 can achieve good imaging quality.

[0144] Example 8

[0145] 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.

[0146] 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 wall thickness of the object-side end face of the fourth lens barrel is increased, which helps to reduce the risk of stress deformation of the sixth to seventh lenses and ensures the assembly stability of the optical imaging lens.

[0147] In summary, Embodiments 1 to 8 of the optical imaging lens respectively satisfy the relationships shown in Table 10.

[0148] Table 10

[0149] Conditional Expression / Embodiment 1 2 3 4 5 6 7 8 R16 / (D40m-d40m) 10.00 10.00 7.99 7.99 9.42 12.98 8.18 8.18 R15 / d7m 2.24 2.28 1.33 1.31 1.74 1.66 1.36 1.36 R14xN7x(D7m-d7m) 31.57 33.13 34.37 41.39 33.11 41.54 42.66 47.64 f7 / EP67 -7.46 -7.46 -8.25 -7.77 -7.82 -6.82 -7.24 -7.13 R13 / (D7s-d7s) -4.62 -4.40 -5.00 -4.15 -5.22 -4.16 -3.59 -3.22 R12xN6 / d6s -1.55 -1.61 -1.85 -1.80 -1.89 -1.79 -1.78 -1.78 f6 / (CP6+CT6) 9.95 9.95 13.98 13.98 13.51 13.51 12.29 12.29 f5 / (CP4+T45) 5.18 5.39 5.97 5.97 5.93 5.93 5.74 5.74 R10xN5 / d30m -2.65 -2.78 -2.44 -2.34 -2.60 -2.19 -2.43 -2.43 R9 / (D4m-d4m) 6.05 5.22 6.52 5.82 6.50 6.42 4.78 4.78 R7 / d3m 1.12 1.12 1.22 1.25 1.46 1.58 1.46 1.39 f2 / f1 -2.37 -2.37 -2.38 -2.38 -3.93 -3.93 -4.84 -4.84

[0150] Table 11 shows the effective focal lengths f1 to f8 of each lens in the optical imaging lenses of Examples 1 to 8, in mm.

[0151] Table 11

[0152] Parameter / Embodiment 1 2 3 4 5 6 7 8 f 22.60 22.60 22.60 22.60 22.60 22.60 22.60 22.60 f1 49.15 49.15 50.10 50.10 51.00 51.00 50.10 50.10 f2 -116.52 -116.52 -119.31 -119.31 -200.25 -200.25 -242.47 -242.47 f3 13.20 13.20 12.25 12.25 11.62 11.62 12.36 12.36 f4 -10.52 -10.52 -9.69 -9.69 -8.87 -8.87 -8.60 -8.60 f5 10.67 10.67 10.62 10.62 10.45 10.45 9.91 9.91 f6 12.26 12.26 17.09 17.09 16.65 16.65 15.14 15.14 f7 -8.35 -8.35 -9.52 -9.52 -9.58 -9.58 -8.99 -8.99 f8 -34.02 -34.02 -57.00 -57.00 -46.32 -46.32 -57.73 -57.73

[0153] Table 12 shows some structural parameters of the optical imaging lenses of Examples 1 to 8, in mm.

[0154] Table 12

[0155]

[0156]

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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 sixth spacer located between a sixth lens and a seventh lens and in at least partial contact with the image-side surface of the sixth lens, and a seventh spacer 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 lens barrel assembly, wherein the lens group and the spacer element group are housed within the lens barrel assembly, the lens barrel assembly from the object side to the image side of the optical imaging lens includes a first lens barrel to a fourth lens barrel arranged in sequence at intervals, the first lens being housed within the first lens barrel, the second lens being housed within the second lens barrel, the third to fifth lenses being housed within the third lens barrel, and the sixth to eighth lenses being housed within the fourth lens barrel; Wherein, the effective focal length f7 of the seventh lens and the distance EP67 between the sixth and seventh spacers along the optical axis of the optical imaging lens satisfy the following condition: -8.25≤f7 / EP67≤-6.82; The radius of curvature R15 of the object side of the eighth lens and the inner diameter d7m of the image side of the seventh spacer element satisfy the following condition: 1.31≤R15 / d7m≤2.

28.

2. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R16 of the image side surface of the eighth lens, the outer diameter D40m of the image side end face of the fourth lens barrel, and the inner diameter d40m of the image side end face of the fourth lens barrel satisfy the following condition: 7.99≤R16 / (D40m-d40m)≤12.

98.

3. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R14 of the image side surface of the seventh lens, the refractive index N7 of the seventh lens, the outer diameter D7m of the image side surface of the seventh spacer element, and the inner diameter d7m of the image side surface of the seventh spacer element satisfy the following condition: 31.57≤R14×N7×(D7m-d7m)≤47.

64.

4. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R13 of the object side surface of the seventh lens, the outer diameter D7s of the object side surface of the seventh spacer element, and the inner diameter d7s of the object side surface of the seventh spacer element satisfy the following condition: -5.22≤R13 / (D7s-d7s)≤-3.

22.

5. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R12 of the image side of the sixth lens, the refractive index N6 of the sixth lens, and the inner diameter d6s of the object side of the sixth spacer element satisfy the following condition: -1.89≤R12×N6 / d6s≤-1.

55.

6. The optical imaging lens according to claim 1, characterized in that, The effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the maximum thickness CP6 of the sixth spacer element along the optical axis satisfy the following condition: 9.95≤f6 / (CP6+CT6)≤13.

98.

7. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image side surface of the fourth lens. The effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy the following: 5.18≤f5 / (CP4+T45)≤5.

97.

8. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R10 of the image side surface of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d30m of the image side end face of the third lens tube satisfy the following condition: -2.78≤R10×N5 / d30m≤-2.

19.

9. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image side surface of the fourth lens. The radius of curvature R9 of the object side surface of the fifth lens, the outer diameter D4m of the image side surface of the fourth spacer element, and the inner diameter d4m of the image side surface of the fourth spacer element satisfy the following: 4.78≤R9 / (D4m-d4m)≤6.

52.

10. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side surface of the third lens. The radius of curvature R7 of the object side surface of the fourth lens and the inner diameter d3m of the image side surface of the third spacer element satisfy the following: 1.12≤R7 / d3m≤1.

58.

11. The optical imaging lens according to claim 1, characterized in that, The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the following condition: -4.84≤f2 / f1≤-2.

37.

12. 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, and the image side of the first lens is concave. The seventh lens has negative optical power, the object side of the seventh lens is concave, and the image side of the seventh lens is concave. The eighth lens has negative optical power, the object side of the eighth lens is convex, and the image side of the eighth lens is concave.

13. The optical imaging lens according to claim 1, characterized in that, The second lens has negative optical power, its object-side surface is concave, and its image-side surface is convex. 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 convex, and its image-side surface is concave. The fifth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex. The sixth lens has positive optical power, its object-side surface is concave, and its image-side surface is convex.

Images