Optical imaging lens

Abstract

The application provides an optical imaging lens, comprising a lens barrel, a first lens to an eighth lens and a plurality of spacer elements, wherein a fifth spacer element is in contact with an image side surface of the fifth lens, a sixth spacer element is in contact with an image side surface of the sixth lens, and a seventh spacer element is in contact with an image side surface of the seventh lens; a combined focal length f67 of the sixth lens and the seventh lens, a maximum thickness CP5 of the fifth spacer element along an optical axis direction of the optical imaging lens, a maximum thickness CP6 of the sixth spacer element along the optical axis direction, and a maximum thickness CP7 of the seventh spacer element along the optical axis direction satisfy: 4.0 < f67 / (CP5+CP6+CP7) < 17.5; a curvature radius R12 of the image side surface of the sixth lens, a curvature radius R15 of an object side surface of the eighth lens, a spacing distance EP56 of the fifth spacer element to the sixth spacer element along the optical axis direction, and a spacing distance EP67 of the sixth spacer element to the seventh spacer element along the optical axis direction satisfy: 0.5 < |R15 / R12|*(EP56 / EP67) < 7.5. The application solves the problem of low yield in the assembly process of the optical imaging lens in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging equipment, in particular to an optical imaging lens. BACKGROUND

[0002] The continuous updating iteration of mobile electronic devices promotes the optimization and upgrading of related industries, and the most representative mobile phone industry drives the continuous iteration and upgrading of optical imaging lenses. With the continuous increase of mobile phone memory and the extreme pursuit of people for the quality of photography, high definition and high picture cleanliness have become the strong demand of terminal users. However, the requirement of high pixel and large image surface promotes the use of more and more lens pieces in the lens, and more and more mechanisms and components are used for bearing and mounting. Especially for the rear lens and the spacer element, the thickness and distance of the spacer element have a great influence on the shape of the lens, and the problem of too large difference between the center thickness and the edge thickness of the lens is easy to occur. In the process of processing and forming, the fusion marks are generated, which affects the appearance of the lens. At the same time, the lens and the spacer element are prone to deformation and fracture in the assembly process, so that the yield of the lens assembly process is low. Therefore, how to design the shape, thickness and distance of the rear lens and the spacer element of the optical imaging lens to improve the yield of the lens assembly process is always the goal pursued. SUMMARY

[0003] The main purpose of the present application is to provide an optical imaging lens to solve the problem of low yield of the optical imaging lens assembly process in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present application provides an optical imaging lens, comprising: a lens barrel; a first lens to an eighth lens sequentially accommodated in the lens barrel from the object side to the image side of the optical imaging lens; a plurality of spacer elements, the fifth spacer element is located on the image side of the fifth lens and partially contacts the image side surface of the fifth lens, the sixth spacer element is located on the image side of the sixth lens and partially contacts the image side surface of the sixth lens, and the seventh spacer element is located on the image side of the seventh lens and partially contacts the image side surface of the seventh lens; wherein the combination focal length f67 of the sixth lens and the seventh lens, the maximum thickness CP5 of the fifth spacer element along the optical axis direction of the optical imaging lens, the maximum thickness CP6 of the sixth spacer element along the optical axis direction, and the maximum thickness CP7 of the seventh spacer element along the optical axis direction satisfy: 4.0 < f67 / (CP5+CP6+CP7) < 17.5; the curvature radius R12 of the image side surface of the sixth lens, the curvature radius R15 of the object side surface of the eighth lens, the interval distance EP56 of the fifth spacer element to the sixth spacer element along the optical axis direction, and the interval distance EP67 of the sixth spacer element to the seventh spacer element along the optical axis direction satisfy: 0.5 < |R15 / R12|*(EP56 / EP67) < 7.5.

[0005] Furthermore, the maximum height L of the lens barrel, the effective focal length f of the optical imaging lens, and the aperture number FNO of the optical imaging lens satisfy the following relationship: 1.5 <L / f*FNO<2.5。

[0006] Furthermore, the plurality of spacer elements also includes a first spacer element located on the image side of the first lens and partially in contact with the image side surface of the first lens. The first lens has positive optical power, the eighth lens has negative optical power, and the effective focal length f1 of the first lens, the effective focal length f8 of the eighth lens, the inner diameter d1m of the image side surface of the first spacer element, and the inner diameter d7m of the image side surface of the seventh spacer element satisfy the following relationship: 0 <f1 / d1m+f8 / d7m<3.0。

[0007] Furthermore, the radius of curvature of the object-side surface of the second lens and the radius of curvature of the image-side surface of the third lens have the same sign, and the radius of curvature of the image-side surface of the second lens and the radius of curvature of the object-side surface of the third lens have the same sign. The radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, and the inner diameter d1m of the image-side surface of the first spacer element satisfy the following condition: 0 mm. -1 <(R4 / R5+R3 / R6) / d1m<2.0mm -1 .

[0008] Furthermore, the plurality of spacer elements also includes a fourth spacer element located on the image side of the fourth lens and in partial contact with the image side surface of the fourth lens. The radius of curvature R8 of the image side surface of the fourth lens, the radius of curvature R14 of the image side surface of the seventh lens, the inner diameter d0s of the object side end face of the lens barrel, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy the following relationship: -5.0 <R8 / R14+d0s / d4s<3.5。

[0009] Furthermore, the plurality of spacer elements also includes a fourth spacer element located on the image side of the fourth lens and in partial contact with the image side surface of the fourth lens. The radius of curvature R8 of the image side surface of the fourth lens, the effective focal length f4 of the fourth lens, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy the following condition: -1.0 <R8 / f4+CP4 / d4s<4.5。

[0010] Furthermore, the effective focal length f8 of the eighth lens, the outer diameter D7s of the object side of the seventh spacer element, and the outer diameter D6s of the object side of the sixth spacer element satisfy the following condition: 1.5 < |(f8 / (D7s-D6s)| < 26.7.

[0011] Furthermore, the outer diameter D7m of the image-side surface of the seventh spacer element, the outer diameter D6m of the image-side surface of the sixth spacer element, the maximum thickness CP7 of the seventh spacer element along the optical axis, and the center thickness CT8 of the eighth lens satisfy the following condition: -3.0 < (D7m - D6m) * CP7 / (CT8) 2 <15.2.

[0012] Furthermore, the inner diameter d0m of the image-side end face of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field of view (Semi-FOV) of the optical imaging lens satisfy the following condition: 2.0 <d0m / (f*tan(Semi-FOV))<3.5。

[0013] Furthermore, the outer diameter D7m of the image-side surface of the seventh spacer element, the inner diameter d7m of the image-side surface of the seventh spacer element, the effective focal length f8 of the eighth lens, and the effective focal length f of the optical imaging lens satisfy the following relationship: 1.0 <D7m / d7m / (|f8 / f|)<2.5。

[0014] Furthermore, the minimum value f among the absolute values ​​of the effective focal lengths of the fifth, sixth, and seventh lenses. MIN The maximum value CP among the maximum thicknesses of the fifth, sixth, and seventh spacers along the optical axis. MAX The condition is satisfied with: 5.0 <f MIN / CP MAX <21.6.

[0015] Furthermore, the effective focal length f5 of the fifth lens, the inner diameter d5m of the image side of the fifth spacer element, and the inner diameter d6s of the object side of the sixth spacer element satisfy the following condition: 0 < |f5 / (d5m+d6s)| < 2.5.

[0016] Furthermore, the Abbe number V5 of the fifth lens, the Abbe number V8 of the eighth lens, the radius of curvature R15 of the object side of the eighth lens, and the maximum thickness CP5 of the fifth spacer element along the optical axis satisfy the following: -7.0 < (V5 - V8) / (R15 / CP5) < 1.7.

[0017] Furthermore, at least one of the fifth, sixth, and seventh spacer elements has a maximum thickness greater than 0.1 mm along the optical axis.

[0018] Furthermore, the second lens has positive optical power, the third lens has optical power with the opposite sign to that of the fourth lens, and the radius of curvature of the image side of the fourth lens is greater than zero.

[0019] Applying the technical solution of the present invention, an optical imaging lens includes a lens barrel, a first lens to an eighth lens sequentially accommodated in the lens barrel from the object side to the image side of the optical imaging lens, and a plurality of spacer elements. The fifth spacer element is located on the image side of the fifth lens and partially contacts the image side surface of the fifth lens. The sixth spacer element is located on the image side of the sixth lens and partially contacts the image side surface of the sixth lens. The seventh spacer element is located on the image side of the seventh lens and partially contacts the image side surface of the seventh lens. Among them, the combined focal length f67 of the sixth lens and the seventh lens, the maximum thickness CP5 of the fifth spacer element along the optical axis direction of the optical imaging lens, the maximum thickness CP6 of the sixth spacer element along the optical axis direction, and the maximum thickness CP7 of the seventh spacer element along the optical axis direction satisfy: 4.0 < f67 / (CP5 + CP6 + CP7) < 17.5; the radius of curvature R12 of the image side surface of the sixth lens, the radius of curvature R15 of the object side surface of the eighth lens, the spacing distance EP56 between the fifth spacer element and the sixth spacer element along the optical axis direction, and the spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis direction satisfy: 0.5 < |R15 / R12| * (EP56 / EP67) < 7.5.

[0020] This application provides an 8-piece optical imaging lens. When the number of lens pieces is large, there are many mechanisms and components for supporting and mounting, and problems such as deformation and misalignment are likely to occur during the assembly process, and the requirements for the dimensions and fits of the rear lenses and spacer elements are relatively high. By controlling the focal lengths, radii of curvature of the sixth lens, the seventh lens, and the eighth lens, and the thicknesses and distances of the fifth spacer element, the sixth spacer element, and the seventh spacer element, the shape of the center of the effective diameter region and the thickness of the structural region of the sixth lens, the seventh lens, and the eighth lens can be controlled, thereby further controlling the ratio of the thickness of the structural region to the center thickness of the sixth lens, the seventh lens, and the eighth lens, which is beneficial to the overall processing and shaping of the lens, avoiding the generation of molding weld marks due to excessive thickness differences between the center and the edge of the lens, thus avoiding affecting the appearance of the optical imaging lens, while reducing the risk of inclination and misalignment during the assembly process, avoiding the deformation and fracture of the lens and spacer elements during the assembly process, and improving the yield rate of the optical imaging lens assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 The structural schematic diagram of the optical imaging lens of an optional embodiment of the present invention is shown;

[0023] Figure 2A schematic diagram of the structure of the optical imaging lens of Example 1 of the present invention in a first state is shown.

[0024] Figure 3 A schematic diagram of the structure of the optical imaging lens of Example 1 of the present invention in a second state is shown.

[0025] Figure 4 A schematic diagram of the structure of the optical imaging lens of Example 1 of the present invention in the third state is shown;

[0026] Figures 5 to 7 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of Example 1 of the present invention are shown respectively.

[0027] Figure 8 A schematic diagram of the structure of the optical imaging lens of Example 2 of the present invention in a first state is shown;

[0028] Figure 9 A schematic diagram of the structure of the optical imaging lens of Example 2 of the present invention in a second state is shown;

[0029] Figure 10 A schematic diagram of the optical imaging lens of Example 2 of the present invention in a third state is shown;

[0030] Figures 11 to 13 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of Example 2 of the present invention are shown respectively.

[0031] Figure 14 A schematic diagram of the structure of the optical imaging lens of Example 3 of the present invention in a first state is shown;

[0032] Figure 15 A schematic diagram of the structure of the optical imaging lens of Example 3 of the present invention in the second state is shown;

[0033] Figure 16 A schematic diagram of the structure of the optical imaging lens of Example 3 of the present invention in a third state is shown;

[0034] Figures 17 to 19 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of Example 3 of the present invention are shown respectively.

[0035] The above figures include the following reference numerals:

[0036] P0, Lens tube; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; P1, First spacer element; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; P2, Second spacer element; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; P3, Third spacer element; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; P4, Fourth spacer element; E5 S9, the object-side surface of the fifth lens; S10, the image-side surface of the fifth lens; P5, the fifth spacer element; P5b, the fifth auxiliary spacer element; E6, the sixth lens; S11, the object-side surface of the sixth lens; S12, the image-side surface of the sixth lens; P6, the sixth spacer element; E7, the seventh lens; S13, the object-side surface of the seventh lens; S14, the image-side surface of the seventh lens; P7, the seventh spacer element; E8, the eighth lens; S15, the object-side surface of the eighth lens; S16, the image-side surface of the eighth lens. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] In this invention, 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 intended to limit this invention.

[0040] To address the problem of low assembly yield of optical imaging lenses in existing technologies, this invention provides an optical imaging lens.

[0041] Example 1

[0042] like Figures 1 to 19As shown in the figure, the optical imaging lens includes a lens barrel, a first lens to an eighth lens disposed in the lens barrel in sequence from the object side to the image side of the optical imaging lens, and a plurality of spacer elements. The fifth spacer element is located on the image side of the fifth lens and is in partial contact with the image side surface of the fifth lens. The sixth spacer element is located on the image side of the sixth lens and is in partial contact with the image side surface of the sixth lens. The seventh spacer element is located on the image side of the seventh lens and is in partial contact with the image side surface of the seventh lens. Among them, the combined focal length f67 of the sixth lens and the seventh lens, the maximum thickness CP5 of the fifth spacer element along the optical axis direction of the optical imaging lens, the maximum thickness CP6 of the sixth spacer element along the optical axis direction, and the maximum thickness CP7 of the seventh spacer element along the optical axis direction satisfy: 4.0 < f67 / (CP5 + CP6 + CP7) < 17.5; the radius of curvature R12 of the image side surface of the sixth lens, the radius of curvature R15 of the object side surface of the eighth lens, the spacing distance EP56 between the fifth spacer element and the sixth spacer element along the optical axis direction, and the spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis direction satisfy: 0.5 < |R15 / R12| * (EP56 / EP67) < 7.5.

[0043] This application provides an 8-piece optical imaging lens. When the number of lens pieces is large, there are many mechanisms and components for supporting and installing, and problems such as deformation and misalignment are likely to occur during the assembly process, and higher requirements are imposed on the dimensions and fits of the rear lenses and spacer elements. By controlling the focal lengths, radii of curvature of the sixth lens, the seventh lens, and the eighth lens, as well as the thicknesses and distances of the fifth spacer element, the sixth spacer element, and the seventh spacer element, it is possible to control the shape of the center of the effective diameter region and the thickness of the structural region of the sixth lens, the seventh lens, and the eighth lens, thereby further controlling the ratio of the thickness of the structural region to the center thickness of the sixth lens, the seventh lens, and the eighth lens, which is beneficial to the overall processing and shaping of the lens, avoiding the generation of molding weld marks due to excessive difference in thickness between the center and the edge of the lens, thus avoiding affecting the appearance of the optical imaging lens, while reducing the risk of tilt and misalignment during the assembly process, avoiding deformation and fracture of the lens and spacer elements during the assembly process, and improving the yield rate of the optical imaging lens during the assembly process.

[0044] In this embodiment, the maximum height L of the lens barrel, the effective focal length f of the optical imaging lens, and the f-number FNO of the optical imaging lens satisfy: 1.5 < L / f * FNO < 2.5. By restricting L / f * FNO within a reasonable range and controlling the maximum height of the lens barrel, the reasonable shape size of the lens can be ensured; at the same time, through the reasonable setting of the effective focal length of the optical imaging lens, high image quality of the optical imaging lens is ensured; at the same time, it is beneficial to design the f-number of the optical imaging lens and improve the lens quality.

[0045] In this embodiment, among the multiple spacer elements, there is also a first spacer element located on the image side of the first lens and partially contacting the image side surface of the first lens. The first lens has a positive optical power, and the eighth lens has a negative optical power. The effective focal length f1 of the first lens, the effective focal length f8 of the eighth lens, the inner diameter d1m of the image side surface of the first spacer element, and the inner diameter d7m of the image side surface of the seventh spacer element satisfy: 0 < f1 / d1m + f8 / d7m < 3.0. By restricting f1 / d1m + f8 / d7m within a reasonable range, the light transmission quality of the optical imaging lens can be effectively controlled. On the premise of ensuring an image height matching the chip, the path of marginal rays can be controlled to keep them away from the object side end face of the lens barrel, the inclined plane position connecting the object side end face of the lens barrel and the inner wall surface of the lens barrel, and the exit hole position at the tail end of the lens barrel, thereby avoiding the generation of light source concentric arc stray light and red arc stray light.

[0046] In this embodiment, the sign of the curvature radius of the object side surface of the second lens is the same as that of the curvature radius of the image side surface of the third lens, and the sign of the curvature radius of the image side surface of the second lens is the same as that of the curvature radius of the object side surface of the third lens. The curvature radius R3 of the object side surface of the second lens, the curvature radius R4 of the image side surface of the second lens, the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, and the inner diameter d1m of the image side surface of the first spacer element satisfy: 0mm -1 <(R4 / R5 + R3 / R6) / d1m < 2.0mm -1 . By restricting (R4 / R5 + R3 / R6) / d1m within a reasonable range, the light blocking efficiency of the first spacer element and the stability of the first spacer element bearing against the components on both sides can be effectively improved. Also, the risks of baking deformation and assembly eccentricity of the first spacer element can be significantly reduced, and the generation of light leakage and stray light caused by the deformation and assembly eccentricity of the first spacer element can be reduced. Additionally, after the curvature radii of the second lens and the third lens satisfy the above relationship, the gap stability after assembly can be ensured, and the degradation of shooting performance caused by gap changes can be reduced.

[0047] In this embodiment, among the multiple spacer elements, there is also a fourth spacer element located on the image side of the fourth lens and partially contacting the image side surface of the fourth lens. The curvature radius R8 of the image side surface of the fourth lens, the curvature radius R14 of the image side surface of the seventh lens, the inner diameter d0s of the object side end face of the lens barrel, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -5.0 < R8 / R14 + d0s / d4s < 3.5. By restricting R8 / R14 + d0s / d4s within a reasonable range, the angle of light passing through the image side surface of the fourth lens and the image side surface of the seventh lens near the optical axis can be controlled. On the premise of ensuring normal light convergence, the inner diameter of the fourth spacer element can be controlled, and the light passing through the fourth lens directly hitting the structural part of the subsequent lens can also be avoided, reducing the generation of stray light.

[0048] It should be noted that the structural part of the lens refers to the position that does not participate in imaging and plays a supporting role.

[0049] In this embodiment, among the plurality of spacer elements, there is also a fourth spacer element located on the image side of the fourth lens and partially contacting the image side surface of the fourth lens. The radius of curvature R8 of the image side surface of the fourth lens, the effective focal length f4 of the fourth lens, the maximum thickness CP4 of the fourth spacer element along the optical axis direction, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -1.0 < R8 / f4 + CP4 / d4s < 4.5. By restricting R8 / f4 + CP4 / d4s within a reasonable range and controlling the shape of the fourth lens to a certain extent, the limitation on the maximum thickness of the fourth spacer element along the optical axis direction and the inner diameter of the object side surface of the fourth spacer element can minimize the incidence of extra light into the subsequent lenses.

[0050] In this embodiment, the effective focal length f8 of the eighth lens, the outer diameter D7s of the object side surface of the seventh spacer element, and the outer diameter D6s of the object side surface of the sixth spacer element satisfy: 1.5 < |(f8 / (D7s - D6s)| < 26.7. By restricting |(f8 / (D7s - D6s)| within a reasonable range and thus controlling the outer diameters of the object side surfaces of the seventh and sixth spacer elements, a relatively stable aperture step difference of the lenses before and after the sixth and seventh spacer elements can be obtained. After assembling the sixth and seventh spacer elements, a stable gap can be obtained, which is beneficial to controlling the aperture of the eighth lens and facilitating its molding process. Preferably, 1.5 < |(f8 / (D7s - D6s)| < 6.0.

[0051] In this embodiment, the outer diameter D7m of the image side surface of the seventh spacer element, the outer diameter D6m of the image side surface of the sixth spacer element, the maximum thickness CP7 of the seventh spacer element along the optical axis direction, and the central thickness CT8 of the eighth lens satisfy: -3.0 < (D7m - D6m) * CP7 / (CT8 2 ) < 15.2. By restricting (D7m - D6m) * CP7 / (CT8 2 ) within a reasonable range, the central thickness and edge thickness of the eighth lens can be in a relatively reasonable range, reducing the risk of welding marks during the molding of the eighth lens, thereby reducing the risk of stray light caused by welding marks and improving the imaging cleanliness of the lens; at the same time, by controlling the outer diameters of the object side surfaces of the seventh and sixth spacer elements, a relatively stable aperture step difference of the lenses before and after the sixth and seventh spacer elements can be obtained. After assembling the sixth and seventh spacer elements, a stable gap can be obtained. Preferably, -3.0 < (D7m - D6m) * CP7 / (CT8 2 ) < 2.0.

[0052] In this embodiment, the inner diameter d0m of the image-side end face of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field angle Semi-FOV of the optical imaging lens satisfy: 2.0 < d0m / (f * tan(Semi-FOV)) < 3.5. By restricting d0m / (f * tan(Semi-FOV)) within a reasonable range, the light transmission quality of the optical imaging lens can be effectively controlled. On the premise of ensuring an image height matching the chip, the marginal rays can be controlled to be away from the image-side end face of the lens barrel, avoiding the generation of light source concentric circular arc stray light and red arc stray light when the light is incident on the lens barrel.

[0053] In this embodiment, the outer diameter D7m of the image-side face of the seventh spacer element, the inner diameter d7m of the image-side face of the seventh spacer element, the effective focal length f8 of the eighth lens, and the effective focal length f of the optical imaging lens satisfy: 1.0 < D7m / d7m / (|f8 / f|) < 2.5. By restricting D7m / d7m / (|f8 / f|) within a reasonable range, the light blocking efficiency of the seventh spacer element and the stability between the seventh spacer element and the two adjacent supporting components can be effectively improved. Further, when the inner and outer diameters of the seventh spacer element are within this range, the risks of baking deformation and assembly eccentricity of the seventh spacer element can be significantly reduced, and the generation of stray light caused by spacer element deformation and assembly eccentricity can be reduced. Additionally, by controlling the effective focal lengths of the eighth lens and the optical imaging lens to satisfy the above relationship, the smoothness and formability of the effective diameter region of the eighth lens can be improved, which is beneficial to improving the imaging quality.

[0054] In this embodiment, the minimum value f among the absolute values of the effective focal lengths of the fifth lens, the sixth lens, and the seventh lens MIN 、the maximum value CP of the maximum thicknesses of the fifth spacer element, the sixth spacer element, and the seventh spacer element along the optical axis direction MAX satisfy: 5.0 < f MIN / CP MAX < 21.6. By restricting f MIN / CP MAX within a reasonable range, by controlling the effective focal lengths of the fifth lens, the sixth lens, and the seventh lens to cooperate with the effective focal lengths of other lenses, a relatively stable imaging focal plane position can be achieved in the optical imaging lens, which is beneficial to the stability of imaging during the use of the lens. Additionally, when the thicknesses of the fifth spacer element, the sixth spacer element, and the seventh spacer element are within this range, the risks of assembly deformation and baking deformation of the fifth spacer element, the sixth spacer element, and the seventh spacer element can be significantly reduced.

[0055] In this embodiment, the effective focal length f5 of the fifth lens, the inner diameter d5m of the image side of the fifth spacer element, and the inner diameter d6s of the object side of the sixth spacer element satisfy the following relationship: 0 < |f5 / (d5m+d6s)| < 2.5. By limiting |f5 / (d5m+d6s)| within a reasonable range, the light-gathering ability of the optical imaging lens can be improved, thus enhancing image clarity. Simultaneously, the matching degree between the lens edge field of view (CRA) and the chip CRA can be improved, reducing the risk of color cast. Furthermore, when d5m and d6s satisfy the above relationship, a relatively stable aperture step difference can be obtained, reducing the risk of stray light from the spacer elements.

[0056] In this embodiment, the Abbe number V5 of the fifth lens, the Abbe number V8 of the eighth lens, the radius of curvature R15 of the object side surface of the eighth lens, and the maximum thickness CP5 of the fifth spacer element along the optical axis satisfy the following: -7.0 < (V5 - V8) / (R15 / CP5) < 1.7. By limiting (V5 - V8) / (R15 / CP5) within a reasonable range, the second, third, and fourth lenses can be designed with materials of different dispersion coefficients for optimization. Combined with the control of V5 and V8, the chromatic aberration of the optical imaging lens can be reduced, and the overall imaging effect of the optical imaging lens can be improved. At the same time, the light-gathering ability of the optical imaging lens can be improved, and the image sharpness can be enhanced. In addition, the control of CP5 is beneficial to lens support and increases lens stability.

[0057] In this embodiment, at least one of the fifth, sixth, and seventh spacer elements has a maximum thickness greater than 0.1 mm along the optical axis. This arrangement helps to stabilize and keep the air gap between the rear lens and its adjacent lenses on the optical axis within a reasonable range, which is beneficial for improving assembly stability and consistency, adjusting field curvature, and enhancing lens performance. Simultaneously, controlling the thickness of the spacer elements and the center thickness of the lens improves assembly stability and facilitates the processing and shaping of the lens and spacer elements.

[0058] In this embodiment, the second lens has positive optical power, the third lens has optical power with the opposite sign to that of the fourth lens, and the radius of curvature of the image-side surface of the fourth lens is greater than zero. By coordinating the effective focal lengths of these three lenses with the effective focal lengths of other lenses, a relatively stable imaging focal plane position can be achieved in the optical imaging lens, which is beneficial to the stability of imaging during lens use.

[0059] Optionally, the aforementioned optical imaging lens may further include a filter for correcting color aberrations and / or a protective glass for protecting the photosensitive element located on the imaging surface. The optical imaging lens in this application may employ multiple lenses, such as the eight lenses described above. By rationally allocating the effective focal length, surface shape, center thickness of each lens, and on-axis distance between each lens, the aperture of the optical imaging lens can be effectively increased, the lens sensitivity reduced, and the lens's manufacturability improved, making the optical imaging lens more suitable for manufacturing and processing and applicable to portable electronic devices such as smartphones.

[0060] 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 its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0061] 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.

[0062] Figure 1 A schematic diagram of the structure of an optical imaging lens of this application is shown. Figure 1 The diagram also indicates parameters such as d0s, D1s, and D6m to clearly and intuitively explain their meaning. To better illustrate the optical imaging lens structure and specific surface features, these parameters will not be shown in the accompanying diagrams when explaining specific examples later.

[0063] Where Dis refers to the outer diameter of the object-side surface of the i-th spacer element, dis refers to the inner diameter of the object-side surface of the i-th spacer element, Dim refers to the outer diameter of the image-side surface of the i-th spacer element, dim refers to the inner diameter of the image-side surface of the i-th spacer element, CPi refers to the maximum thickness of the i-th spacer element, which is also the maximum distance along the optical axis from the object-side surface of the i-th spacer element to the image-side surface of the i-th spacer element, and EPij refers to the distance along the optical axis between the image-side surface of the i-th spacer element and the object-side surface of the j-th spacer element, where i and j are both positive integers greater than or equal to 1. d0s is the inner diameter of the object-side end face of the lens barrel, and D0m is the outer diameter of the image-side end face of the lens barrel. The maximum height of the lens barrel P0 refers to the maximum distance along the optical axis from the object-side end face of the lens barrel P0 to the image-side end face of the lens barrel P0.

[0064] 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.

[0065] It should be noted that the following example includes both a first state and a second state. In the same example, the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses of the optical imaging lens have the same radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients. However, the parameters such as the lens barrel P0, the thickness of the spacer elements, the maximum thickness of the spacer elements, the inner diameter and outer diameter of the spacer elements, and the distance between the spacer elements differ, as do the shapes of some lenses. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0066] It should be noted that any of the examples one through three below are applicable to all embodiments of this application.

[0067] Example 1

[0068] like Figures 2 to 7 As shown, an optical imaging lens of Example 1 of this application is described. Figure 2 A schematic diagram of the optical imaging lens in Example 1 in its first state is shown. Figure 3 A schematic diagram of the optical imaging lens in Example 1 in the second state is shown. Figure 4 A schematic diagram of the optical imaging lens in Example 1 in its third state is shown.

[0069] like Figure 2 and Figure 3 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, and an eighth lens E8. Among these, while ensuring sufficient light transmission, the inner diameter of the second spacer element P2 is smaller than that of the first spacer element P1, which is beneficial for absorbing stray light from the first lens E1 and ensuring image quality. The fifth spacer element P5 has the greatest thickness to provide strong support for the lenses on both sides, ensuring the assembly stability of the optical imaging lens.

[0070] exist Figure 2In the middle, the spacer elements are all located between two adjacent lenses, and the first spacer element P1 to the seventh spacer element P7 all abut against part of the inner wall surface of the lens barrel P0, specifically, they abut against the inner wall surface of the lens barrel P0 parallel to the optical axis, and the first lens E1 to the eighth lens E8 are all spaced apart and do not directly abut against each other.

[0071] exist Figure 3 In, with Figure 2 The difference lies in the size and position of the lens and the spacer element.

[0072] like Figure 4 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, and an eighth lens E8. Among these, while ensuring sufficient light transmission, the inner diameter of the second spacer element P2 is smaller than that of the first spacer element P1, which is beneficial for absorbing stray light from the first lens E1 and ensuring image quality. The fifth auxiliary spacer element P5b has the greatest thickness to support the front lens and ensure the assembly stability of the optical imaging lens.

[0073] like Figures 2 to 4 As shown, the object-side surface of the first lens is S1, the image-side surface of the first lens is S2, the object-side surface of the second lens is S3, the image-side surface of the second lens is S4, the object-side surface of the third lens is S5, the image-side surface of the third lens is S6, the object-side surface of the fourth lens is S7, the image-side surface of the fourth lens is S8, the object-side surface of the fifth lens is S9, the image-side surface of the fifth lens is S10, the object-side surface of the sixth lens is S11, the image-side surface of the sixth lens is S12, the object-side surface of the seventh lens is S13, the image-side surface of the seventh lens is S14, the object-side surface of the eighth lens is S15, and the image-side surface of the eighth lens is S16.

[0074] In this example, the second lens has positive optical power, the third lens has negative optical power, and the fourth lens has positive optical power. The radius of curvature of the image-side surface of the fourth lens is greater than zero. In the first and second states, CP5 and CP7 are greater than 0.1 mm, and in the third state, CP7 is greater than 0.1 mm.

[0075] Table 1 shows the basic structural parameters of the optical imaging lens in Example 1, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0076]

[0077]

[0078] Table 1

[0079] In Table 1 above, S17 is the object side of the filter, S18 is the image side of the filter, and S19 is the imaging surface.

[0080] In Example 1, the object-side surface and image-side surface of any one of the lenses from the first lens E1 to the eighth lens E8 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0081]

[0082] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical mirrors S1-S16 in Example 1.

[0083]

[0084]

[0085] Table 2

[0086] Figure 5 The on-axis chromatic aberration curve of an optical imaging lens in Example 1 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 6 The astigmatism curve of the optical imaging lens in Example 1 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 7 The magnification chromatic aberration curve of the optical imaging lens in Example 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0087] according to Figures 5 to 7 As can be seen, the optical imaging lens given in Example 1 can achieve good image quality.

[0088] Example 2

[0089] like Figures 8 to 13 As shown, an optical imaging lens of Example 2 of this application is described. Figure 8 A schematic diagram of the optical imaging lens in Example 2 in its first state is shown. Figure 9 A schematic diagram of the optical imaging lens in Example 2 in the second state is shown. Figure 10A schematic diagram of the optical imaging lens of Example 2 in its third state is shown. For the sake of brevity, descriptions similar to those in Example 1 are omitted.

[0090] like Figures 8 to 10 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, and an eighth lens E8. Among these, while ensuring sufficient light transmission, the inner diameter of the second spacer element P2 is smaller than that of the first spacer element P1, which is beneficial for absorbing stray light from the first lens E1 and ensuring image quality. The sixth spacer element P6 has the greatest thickness to facilitate support for the lenses on both sides, ensuring the assembly stability of the optical imaging lens.

[0091] exist Figure 8 In the middle, the spacer elements are all located between two adjacent lenses, and the first spacer element P1 to the seventh spacer element P7 all abut against part of the inner wall surface of the lens barrel P0, specifically, they abut against the inner wall surface of the lens barrel P0 parallel to the optical axis, and the first lens E1 to the eighth lens E8 are all spaced apart and do not directly abut against each other.

[0092] Figure 9 and Figure 10 and Figure 8 The difference lies in the size and position of the lens and the spacer element.

[0093] like Figures 8 to 10 As shown, the object-side surface of the first lens is S1, the image-side surface of the first lens is S2, the object-side surface of the second lens is S3, the image-side surface of the second lens is S4, the object-side surface of the third lens is S5, the image-side surface of the third lens is S6, the object-side surface of the fourth lens is S7, the image-side surface of the fourth lens is S8, the object-side surface of the fifth lens is S9, the image-side surface of the fifth lens is S10, the object-side surface of the sixth lens is S11, the image-side surface of the sixth lens is S12, the object-side surface of the seventh lens is S13, the image-side surface of the seventh lens is S14, the object-side surface of the eighth lens is S15, and the image-side surface of the eighth lens is S16.

[0094] In this example, CP6 is greater than 0.1 mm. The second lens has positive optical power, the third lens has positive optical power, and the fourth lens has negative optical power. The radius of curvature of the image-side surface of the fourth lens is greater than zero. In the third state, CP5 is greater than 0.1 mm.

[0095] Table 3 shows the basic structural parameters of the optical imaging lens in Example 2, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0096] Face number Face type Radius of curvature Thickness Refractive index Abbe number Conic constant OBJ Sphere Infinity Infinity STO Sphere Infinity -0.5657 S1 Asphere 3.6674 0.5668 1.544 56.1 0.1492 S2 Asphere 5.6028 0.1500 -0.0959 S3 Asphere 5.4592 0.5224 1.544 56.1 -0.0498 S4 Asphere 8.6486 0.1281 0.4596 S5 Asphere 5.7224 0.5701 1.544 56.1 -0.3388 S6 Asphere 367.2940 0.4822 41.5900 S7 Asphere -11.7775 0.2000 1.640 23.5 4.5358 S8 Asphere 4.1055 0.3985 0.0159 S9 Asphere 4.1610 0.8754 1.568 37.3 -0.0184 S10 Asphere -18.1063 0.9684 5.8726 S11 Asphere -4.0233 0.6507 1.671 19.2 0.0458 S12 Asphere -4.5958 0.2731 0.3077 S13 Asphere 7.8194 1.3218 1.568 37.3 -3.1576 S14 Asphere -11.5849 1.0411 6.7484 S15 Asphere -8.3283 0.3000 1.640 23.5 3.4564 S16 Asphere 5.2160 0.2898 -3.7790 S17 Sphere Infinity 0.21 1.517 64.2 S18 Sphere Infinity 0.1516 S19 Sphere Infinity 0

[0097] Table 3

[0098] In Table 3 above, S17 is the object side of the filter, S18 is the image side of the filter, and S19 is the imaging surface.

[0099] Table 4 gives the higher-order coefficients of S1-S16 that can be used for each aspherical lens in Example 2. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) in Example 1.

[0100]

[0101]

[0102] Table 4

[0103] Figure 11 The on-axis chromatic aberration curve of the optical imaging lens in Example 2 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 12 The astigmatism curve of the optical imaging lens in Example 2 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 13 The magnification chromatic aberration curve of the optical imaging lens in Example 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0104] according to Figures 11 to 13 As can be seen, the optical imaging lens given in Example 2 can achieve good imaging quality.

[0105] Example 3

[0106] like Figures 14 to 19 As shown, an optical imaging lens of Example 3 of this application is described. Figure 14 A schematic diagram of the optical imaging lens in Example 3 in its first state is shown. Figure 15 A schematic diagram of the optical imaging lens in Example 3 in the second state is shown. Figure 16 A schematic diagram of the optical imaging lens in Example 3 in its third state is shown. For the sake of brevity, descriptions similar to those in Example 1 are omitted.

[0107] like Figures 14 to 16As shown, the optical imaging lens, from the object side to the image side, includes, in sequence, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a seventh lens E7, a seventh spacer element P7, and an eighth lens E8. Among these, the third spacer element P3 has the greatest thickness to facilitate support for the lenses on both sides, ensuring the assembly stability of the optical imaging lens.

[0108] exist Figure 14 In the middle, the spacer elements are all located between two adjacent lenses, and the first spacer element P1 to the seventh spacer element P7 all abut against part of the inner wall surface of the lens barrel P0, specifically, they abut against the inner wall surface of the lens barrel P0 parallel to the optical axis, and the first lens E1 to the eighth lens E8 are all spaced apart and do not directly abut against each other.

[0109] Such as 15 and Figure 16 and Figure 14 The difference lies in the size and position of the lens and the spacer element.

[0110] like Figures 14 to 16 As shown, the object-side surface of the first lens is S1, the image-side surface of the first lens is S2, the object-side surface of the second lens is S3, the image-side surface of the second lens is S4, the object-side surface of the third lens is S5, the image-side surface of the third lens is S6, the object-side surface of the fourth lens is S7, the image-side surface of the fourth lens is S8, the object-side surface of the fifth lens is S9, the image-side surface of the fifth lens is S10, the object-side surface of the sixth lens is S11, the image-side surface of the sixth lens is S12, the object-side surface of the seventh lens is S13, the image-side surface of the seventh lens is S14, the object-side surface of the eighth lens is S15, and the image-side surface of the eighth lens is S16.

[0111] In this example, CP5 is greater than 0.1 mm. The second lens has negative optical power, the third lens has positive optical power, and the fourth lens has positive optical power. The radius of curvature of the image-side surface of the fourth lens is greater than zero.

[0112] Table 5 shows the basic structural parameters of the optical imaging lens in Example 3, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0113] Face number Face type Radius of curvature Thickness Refractive index Abbe number Conic constant OBJ Sphere Infinity Infinity STO Sphere Infinity -0.6342 S1 Asphere 3.5425 0.9610 1.544 56.1 0.1834 S2 Asphere 18.8105 0.9783 36.3435 S3 Asphere -6.8352 0.2000 1.671 19.2 -0.0558 S4 Asphere 14.9870 0.2844 -88.5248 S5 Asphere 13.2036 0.7050 1.544 56.1 -75.1010 S6 Asphere -20.2839 0.1500 9.9253 S7 Asphere 3.3834 0.6411 1.640 23.5 -0.0090 S8 Asphere 8.6918 0.1630 -1.7930 S9 Asphere 14.8937 0.2941 1.671 19.2 5.6137 S10 Asphere 7.5812 0.7846 -1.2312 S11 Asphere -1101.4252 0.5666 1.544 56.1 95.0000 S12 Asphere -5.0264 0.8203 0.0434 S13 Asphere 4.6452 0.2500 1.544 56.1 -20.5650 S14 Asphere 4.9244 0.4512 -28.9561 S15 Asphere -5.8730 0.2500 1.568 37.3 -0.0830 S16 Asphere 6.4610 0.2698 0.2412 S17 Sphere Infinity 0.21 1.517 64.2 S18 Sphere Infinity 0.5206 S19 Sphere Infinity 0

[0114] Table 5

[0115] In Table 5 above, S17 is the object side of the filter, S18 is the image side of the filter, and S19 is the imaging surface.

[0116] Table 6 gives the higher-order coefficients of S1-S16 that can be used for each aspherical lens in Example 3. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) in Example 1.

[0117] Face number A4 A6 A8 A10 A12 A14 A16 S1 -5.31E-04 1.38E-03 -1.32E-03 6.72E-04 -7.78E-05 -8.57E-05 4.98E-05 S2 1.07E-03 4.37E-04 -9.66E-04 1.40E-03 -1.11E-03 5.36E-04 -1.61E-04 S3 -1.98E-03 -2.22E-02 4.01E-02 -3.38E-02 1.77E-02 -6.15E-03 1.41E-03 S4 1.08E-02 -4.67E-02 5.86E-02 -4.29E-02 2.10E-02 -7.01E-03 1.58E-03 S5 4.61E-02 -4.60E-02 2.73E-02 -1.19E-02 3.83E-03 -9.34E-04 1.71E-04 S6 2.32E-02 -2.01E-02 5.05E-03 1.97E-03 -2.17E-03 8.51E-04 -1.88E-04 S7 -2.15E-02 2.35E-03 -5.20E-03 4.43E-03 -1.87E-03 4.62E-04 -7.13E-05 S8 -1.25E-02 4.82E-03 -1.72E-03 5.53E-04 -1.46E-04 2.59E-05 -3.67E-06 S9 1.95E-02 -2.11E-02 1.71E-02 -7.21E-03 1.43E-03 -2.72E-05 -4.64E-05 S10 2.03E-02 -2.10E-02 1.19E-02 -3.50E-03 1.75E-04 1.96E-04 -6.30E-05 S11 3.48E-03 1.72E-02 -1.93E-02 1.05E-02 -3.54E-03 7.82E-04 -1.14E-04 S12 -7.61E-03 3.70E-02 -3.14E-02 1.50E-02 -4.65E-03 9.75E-04 -1.39E-04 S13 -2.24E-01 2.84E-01 -2.20E-01 1.21E-01 -5.29E-02 1.90E-02 -5.41E-03 S14 -2.72E-01 3.28E-01 -2.35E-01 1.16E-01 -4.52E-02 1.49E-02 -4.02E-03 S15 -1.05E-01 1.09E-01 -8.52E-02 4.91E-02 -2.20E-02 7.99E-03 -2.29E-03 S16 -4.21E-03 -1.73E-02 1.04E-02 -3.14E-03 5.82E-04 -6.96E-05 5.36E-06 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.23E-05 1.51E-06 -7.60E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S2 2.90E-05 -2.90E-06 1.21E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S3 -2.06E-04 1.73E-05 -6.33E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 -2.28E-04 1.91E-05 -7.03E-07 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 -2.18E-05 1.68E-06 -5.74E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 2.47E-05 -1.82E-06 5.74E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S7 6.83E-06 -3.75E-07 9.06E-09 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 4.84E-07 -4.35E-08 1.72E-09 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S9 9.62E-06 -8.25E-07 2.72E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S10 8.75E-06 -5.71E-07 1.06E-08 3.23E-10 0.00E+00 0.00E+00 0.00E+00 S11 1.07E-05 -5.68E-07 1.32E-08 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S12 1.29E-05 -7.15E-07 1.89E-08 -9.84E-11 0.00E+00 0.00E+00 0.00E+00 S13 1.16E-03 -1.82E-04 1.98E-05 -1.42E-06 6.03E-08 -1.14E-09 0.00E+00 S14 8.30E-04 -1.24E-04 1.27E-05 -8.44E-07 3.28E-08 -5.64E-10 0.00E+00 S15 4.91E-04 -7.49E-05 7.79E-06 -5.22E-07 2.03E-08 -3.48E-10 0.00E+00 S16 -2.41E-07 3.48E-09 2.40E-10 -1.50E-11 3.34E-13 -2.63E-15 0.00E+00

[0118] Table 6

[0119] Figure 17 The on-axis chromatic aberration curve of the optical imaging lens in Example 3 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 18 The astigmatism curve of the optical imaging lens in Example 3 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 19 The magnification chromatic aberration curve of the optical imaging lens in Example 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0120] according to Figures 17 to 19 As can be seen, the optical imaging lens given in Example 3 can achieve good imaging quality.

[0121] In summary, Examples 1 to 3 satisfy the relationships shown in Table 7.

[0122] Conditional expression / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 f67 / (CP5+CP6+CP7) 4.21 4.45 13.65 7.53 7.90 5.24 16.39 17.01 16.60 |R15 / R12|*(EP56 / EP67) 3.22 3.58 7.27 2.61 2.53 1.94 0.95 1.04 1.03 L / f*FNO 1.88 1.95 1.85 1.96 1.93 2.01 1.87 1.88 1.80 d0m / (f*tan(Semi-FOV)) 2.72 2.63 2.90 2.60 2.72 2.72 2.46 2.51 2.28 R8 / R14+d0s / d4s -4.36 -4.58 -4.70 1.45 1.18 1.33 3.15 3.34 2.81 R8 / f4+CP4 / d4s 4.34 4.34 4.34 -0.87 -0.87 -0.87 1.06 1.07 1.07 |(f8 / (D7s-D6s)| 26.51 26.51 5.43 3.12 2.35 2.70 2.47 1.84 2.16 (D7m-D6m)*CP7 / (CT8 2 )]]> -2.72 -2.50 15.09 0.37 0.41 0.44 0.80 1.67 1.55 D7m / d7m / (|f8 / f|) 1.39 1.49 1.43 2.04 2.04 2.07 1.90 1.87 1.78 f MIN / CP MAX ]]> 5.94 6.22 13.82 5.49 5.79 5.24 19.65 21.41 21.10 |f5 / (d5m+d6s)| 1.73 1.78 2.08 0.56 0.58 0.55 2.00 1.99 1.92 (V5-V8) / (R15 / CP5) -6.75 -6.45 -0.08 -0.04 -0.04 -0.77 1.45 1.33 1.35 f1 / d1m+f8 / d7m 0.49 0.57 0.65 2.72 2.62 2.66 0.87 0.82 0.74 (R4 / R5+R3 / R6) / d1m(mm -1 )]]> 1.61 1.74 1.76 0.31 0.30 0.31 0.33 0.32 0.30

[0123] Table 7

[0124] Table 8 provides some parameters of the optical imaging lenses for Examples 1 to 3.

[0125] Parameter (mm) / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 d1m 5.233 4.821 4.765 4.910 5.059 4.996 4.431 4.551 4.839 d4s 4.715 4.907 4.930 4.319 4.350 4.296 5.350 5.201 5.282 d5m 6.704 6.437 4.606 4.477 4.579 5.254 6.093 6.134 6.485 d6s 4.897 4.837 5.013 6.254 5.705 5.716 5.468 5.476 5.534 D6s 8.269 8.409 6.927 7.168 6.780 7.069 7.458 6.622 6.718 D6m 8.269 8.409 6.927 7.232 7.356 7.308 7.458 6.622 6.718 d7m 6.192 5.900 6.201 5.660 5.733 5.660 5.959 5.989 6.094 D7s 8.005 8.145 8.216 8.747 8.875 8.895 9.621 9.523 9.199 D7m 8.045 8.185 8.256 8.747 8.875 8.895 9.621 9.523 9.199 d0s 8.347 7.594 7.028 7.787 6.661 7.253 7.432 8.175 5.515 d0m 9.293 8.977 9.894 9.635 10.085 10.083 10.361 10.579 9.630 CP4 0.016 0.017 0.019 0.022 0.024 0.025 0.023 0.030 0.033 CP5 1.650 1.577 0.019 0.022 0.024 0.467 0.470 0.432 0.438 EP56 0.671 0.744 2.173 0.976 1.020 0.663 0.300 0.324 0.318 CP6 0.016 0.017 0.019 1.096 1.038 1.147 0.023 0.030 0.033 EP67 0.310 0.309 0.445 0.677 0.730 0.620 0.371 0.366 0.360 CP7 0.760 0.699 0.710 0.022 0.024 0.025 0.023 0.036 0.039 L 10.043 10.395 9.866 9.205 9.063 9.450 8.140 8.183 7.855

[0126] Table 8

[0127] It should be noted that in Tables 7 and 8, 1-1 represents the optical imaging lens in Example 1 in the first state, 1-2 represents the optical imaging lens in Example 1 in the second state, 1-3 represents the optical imaging lens in Example 1 in the third state, 2-1 represents the optical imaging lens in Example 2 in the first state, 2-2 represents the optical imaging lens in Example 2 in the second state, 2-3 represents the optical imaging lens in Example 2 in the third state, 3-1 represents the optical imaging lens in Example 3 in the first state, 3-2 represents the optical imaging lens in Example 3 in the second state, and 3-3 represents the optical imaging lens in Example 3 in the third state.

[0128] Table 9 provides some optical parameters of the optical imaging lenses for Examples 1 to 3.

[0129] Optical parameter / Example One Two Three Semi-FOV (°) 24.47 29.76 33.80 FNO 1.41 1.38 1.45 f (mm) 7.50 6.49 6.30 f1 (mm) 8.47 17.61 7.82 f2 (mm) 20.17 25.64 -6.89 f3 (mm) -4.25 10.64 14.75 f4 (mm) 8.64 -4.69 8.20 f5 (mm) 20.05 6.01 -23.13 f6 (mm) 198.43 -88.05 9.24 f7 (mm) 9.80 8.39 113.92 f8 (mm) -7.00 -4.93 -5.35 f67 (mm) 10.20 8.58 8.46

[0130] Table 9

[0131] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0132] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0133] 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.

[0134] 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.

[0135] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

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: Lens tube; The first to eighth lenses are sequentially housed within the lens barrel from the object side to the image side of the optical imaging lens; Multiple spacer elements are provided, with the fifth spacer element located on the image side of the fifth lens and in contact with the image side surface of the fifth lens, the sixth spacer element located on the image side of the sixth lens and in contact with the image side surface of the sixth lens, and the seventh spacer element located on the image side of the seventh lens and in contact with the image side surface of the seventh lens. 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 image-side surface of the fourth lens is concave. The seventh lens has positive optical power, and the object side of the seventh lens is convex. The eighth lens has negative optical power, the object side of the eighth lens is concave, and the image side of the eighth lens is concave. The optical power distribution of the second to the sixth lenses is positive-negative-positive-positive, or positive-positive-negative-negative, or negative-positive-positive-negative-positive. The combined focal length f67 of the sixth and seventh lenses, the maximum thickness CP5 of the fifth spacer element along the optical axis of the optical imaging lens, the maximum thickness CP6 of the sixth spacer element along the optical axis, and the maximum thickness CP7 of the seventh spacer element along the optical axis satisfy the following: 4.21≤f67 / (CP5+CP6+CP7)≤17.01; The radius of curvature R12 of the image side of the sixth lens, the radius of curvature R15 of the object side of the eighth lens, the spacing distance EP56 between the fifth spacer element and the sixth spacer element along the optical axis, and the spacing distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis satisfy the following condition: 0.95≤|R15 / R12|*(EP56 / EP67)≤7.27; The plurality of spacers also includes a first spacer located on the image side of the first lens and in partial contact with the image side surface of the first lens. The effective focal length f1 of the first lens, the effective focal length f8 of the eighth lens, the inner diameter d1m of the image side surface of the first spacer, and the inner diameter d7m of the image side surface of the seventh spacer satisfy the following: 0.49≤f1 / d1m+f8 / d7m≤2.

72. The radius of curvature of the object-side surface of the second lens and the radius of curvature of the image-side surface of the third lens have the same sign. The radius of curvature of the image-side surface of the second lens and the radius of curvature of the object-side surface of the third lens have the same sign. The inner diameter d1m of the image-side surface of the first spacer element satisfies the following condition: 0.30mm. -1 ≤(R4 / R5+R3 / R6) / d1m≤1.76mm -1 .

2. The optical imaging lens according to claim 1, characterized in that, The maximum height L of the lens barrel, the effective focal length f of the optical imaging lens, and the aperture number FNO of the optical imaging lens satisfy the following condition: 1.80≤L / f*FNO≤2.

01.

3. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a fourth spacer element located on the image side of the fourth lens and in partial contact with the image side surface of the fourth lens. The radius of curvature R8 of the image side surface of the fourth lens, the radius of curvature R14 of the image side surface of the seventh lens, the inner diameter d0s of the object side end face of the lens barrel, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy the following: -4.7≤R8 / R14+d0s / d4s≤3.

34.

4. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a fourth spacer located on the image side of the fourth lens and in partial contact with the image side surface of the fourth lens. The radius of curvature R8 of the image side surface of the fourth lens, the effective focal length f4 of the fourth lens, the maximum thickness CP4 of the fourth spacer along the optical axis, and the inner diameter d4s of the object side surface of the fourth spacer satisfy the following: -0.87≤R8 / f4+CP4 / d4s≤4.

34.

5. The optical imaging lens according to claim 1, characterized in that, The effective focal length f8 of the eighth lens, the outer diameter D7s of the object side of the seventh spacer element, and the outer diameter D6s of the object side of the sixth spacer element satisfy the following condition: 1.84≤|(f8 / (D7s-D6s)|≤26.

51.

6. The optical imaging lens according to claim 1, characterized in that, The outer diameter D7m of the image-side surface of the seventh spacer element, the outer diameter D6m of the image-side surface of the sixth spacer element, the maximum thickness CP7 of the seventh spacer element along the optical axis, and the center thickness CT8 of the eighth lens satisfy the following condition: -2.72≤(D7m-D6m)*CP7 / (CT8) 2 )≤15.

09.

7. The optical imaging lens according to claim 1, characterized in that, The inner diameter d0m of the image-side end face of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field of view (Semi-FOV) of the optical imaging lens satisfy the following condition: 2.28≤d0m / (f*tan(Semi-FOV))≤2.

9.

8. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The outer diameter D7m of the image side of the seventh spacer element, the inner diameter d7m of the image side of the seventh spacer element, the effective focal length f8 of the eighth lens, and the effective focal length f of the optical imaging lens satisfy the following condition: 1.39≤D7m / d7m / (|f8 / f|)≤2.

07.

9. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The minimum value f among the absolute values ​​of the effective focal lengths of the fifth lens, the sixth lens, and the seventh lens. MIN The maximum value CP of the maximum thickness of the fifth, sixth, and seventh spacer elements along the optical axis direction. MAX The condition is satisfied that: 5.24 ≤ f MIN / CP MAX ≤21.

41.

10. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The effective focal length f5 of the fifth lens, the inner diameter d5m of the image side of the fifth spacer element, and the inner diameter d6s of the object side of the sixth spacer element satisfy the following condition: 0.55≤|f5 / (d5m+d6s)|≤2.

08.

11. The optical imaging lens according to any one of claims 1 to 7, characterized in that, The Abbe number V5 of the fifth lens, the Abbe number V8 of the eighth lens, the radius of curvature R15 of the object side surface of the eighth lens, and the maximum thickness CP5 of the fifth spacer element along the optical axis satisfy the following: -6.75≤(V5-V8) / (R15 / CP5)≤1.

45.

12. The optical imaging lens according to any one of claims 1 to 7, characterized in that, At least one of the fifth, sixth, and seventh spacer elements has a maximum thickness greater than 0.1 mm along the optical axis.

Images