Optical imaging lens

Abstract

The application discloses an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a spacer assembly arranged in the inner cavity of the lens barrel; the lens group sequentially comprises a first lens to an eighth lens from the object side to the image side along the optical axis of the optical imaging lens; the spacer assembly comprises a fifth spacer, a sixth spacer and a seventh spacer; the following conditions are met: 1.85 < d0m / f < 2.10; 2.20 < d7m / d5m < 2.70; 1.50 < D6m / (D7m-D5m) < 2.20; 0.25 < EP67 / (CP6+CP7) < 0.75. By using the technical scheme, the risk of producing stray light can be reduced, the imaging quality of the optical imaging lens is improved, and the user experience is improved under the conditions of ensuring the miniaturization of the lens and meeting the large image surface imaging characteristics.

Description

Technical Field

[0001] This application generally relates to the field of optical imaging technology. More specifically, this application relates to an optical imaging lens. Background Technology

[0002] With the rapid development of smartphone imaging technology, optical lens design faces the dual challenge of balancing miniaturization and high performance. Therefore, the design of optical imaging lenses needs to ensure both miniaturization and a large image area, while also maintaining good image quality. However, in order to achieve both ultra-thinness and a large image area, lenses with a large number of elements are prone to problems such as increased refraction angle at the rear end and a corresponding increase in the outer diameter of the lens. This can easily lead to stray light within the lens, affecting overall image quality and user experience.

[0003] In view of this, there is an urgent need to provide an optical imaging lens that can reduce the risk of stray light generation, improve the imaging quality of the optical imaging lens, and enhance the user experience while ensuring lens miniaturization and meeting the large image plane imaging characteristics. Summary of the Invention

[0004] To address at least one or more of the technical problems mentioned above, this application proposes an optical imaging lens in several aspects. This optical imaging lens can reduce the risk of stray light generation, improve the imaging quality, and enhance the user experience while ensuring lens miniaturization and meeting the large image plane imaging characteristics.

[0005] The present application provides an optical imaging lens, comprising: a lens barrel and a lens group and a spacer assembly disposed in the inner cavity of the lens barrel; along the optical axis of the optical imaging lens from the object side to the image side, the lens group sequentially includes a first lens to an eighth lens having optical power; wherein, the first lens has positive optical power, the fifth lens has negative optical power, the seventh lens has positive optical power, and the eighth lens has negative optical power; the spacer assembly includes a fifth spacer in contact with the image side of the fifth lens, a sixth spacer in contact with the image side of the sixth lens, and a seventh spacer in contact with the image side of the seventh lens; 1.85 < d0m / f ≤ 2.10; 2.20 < d7m / d5m ≤ 2.70; 1.50 < D6m / (D7m - D5m) < 2.20; 0.25 < EP67 / (CP6 + CP7) < 0.75; wherein, d0m is the inner diameter of the image side of the lens barrel, f is the effective focal length of the optical imaging lens, d7m is the inner diameter of the image side of the seventh spacer, d5m is the inner diameter of the image side of the fifth spacer, D6m is the outer diameter of the image side of the sixth spacer, D5m is the outer diameter of the image side of the fifth spacer, D7m is the outer diameter of the image side of the seventh spacer, EP67 is the spacing distance between the sixth spacer and the seventh spacer along the optical axis direction, CP6 is the maximum thickness of the sixth spacer, and CP7 is the maximum thickness of the seventh spacer.

[0006] In some embodiments, -2.20 < f8 / R16 < -0.85; 1.15 ≤ d0m / d7m < 1.35; wherein, f8 is the effective focal length of the eighth lens, and R16 is the curvature radius of the image side of the eighth lens.

[0007] In some embodiments, 3.80 < (d7m - d6s) / (EP67 + CP7) < 7.20; wherein, d6s is the inner diameter of the object side of the sixth spacer.

[0008] In some embodiments, 3.40 < (D7s - D6m) / EP67 < 7.10; wherein, D7s is the outer diameter of the object side of the seventh spacer.

[0009] In some embodiments, 2.25 < f67 / (d7s - d5m) < 2.95; wherein, f67 is the combined focal length of the sixth lens and the seventh lens, and d7s is the inner diameter of the object side of the seventh spacer.

[0010] In some embodiments, 10.70 < (D6s - d5m) / EP56 < 13.05; wherein, D6s is the outer diameter of the object side of the sixth spacer, and EP56 is the spacing distance between the fifth spacer and the sixth spacer along the optical axis direction.

[0011] In some embodiments, the spacer component further includes: a second spacer, the second spacer being disposed in contact with the image side surface of the second lens; 1.80 < |f2| / f < 2.80; 3.40 < |f2| / d2s < 6.10; where f2 is the effective focal length of the second lens, and d2s is the inner diameter of the object side surface of the second spacer.

[0012] In some embodiments, the spacer component further includes: a first spacer, the first spacer being disposed in contact with the image side surface of the first lens; 1.20 < f1 / N1 / d1s ≤ 1.75; where f1 is the effective focal length of the first lens, N1 is the refractive index of the first lens, and d1s is the inner diameter of the object side surface of the first spacer.

[0013] In some embodiments, 7.20 < (|f2| + |f3|) / d2s < 13.70; where f2 is the effective focal length of the second lens, and f3 is the effective focal length of the third lens.

[0014] In some embodiments, 0.95 ≤ L / (f * tan(Semi - FOV)) ≤ 1.05; where L is the maximum height of the lens barrel, and Semi - FOV is half of the maximum field angle of the optical imaging lens.

[0015] In some embodiments, 1.15 < D0s / d0s < 1.55, 2.10 < EP01 / EB1 < 4.30; where D0s is the outer diameter of the object side surface of the lens barrel, d0s is the inner diameter of the object side surface of the lens barrel, EP01 is the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer, and EB1 is the maximum thickness of the non - light - transmitting region of the first lens.

[0016] In some embodiments, 0.35 < EP70 / R16 < 0.90; where EP70 is the distance along the optical axis from the image side surface of the seventh spacer to the image - side end face of the lens barrel, and R16 is the radius of curvature of the image side surface of the eighth lens.

[0017] The technical solution provided by this application may include the following beneficial effects: The optical imaging lens provided by the present application includes a lens barrel, a lens group, and a spacer assembly disposed in the inner cavity of the lens barrel. By setting the technical feature that the positive and negative optical powers of the lenses satisfy a large image plane, the ratio between the inner diameter of the image side of the lens barrel and the effective focal length of the optical imaging lens satisfies 1.85 < d0m / f ≤ 2.10, and the ratio between the inner diameter of the image side of the seventh spacer and the inner diameter of the image side of the fifth spacer satisfies 2.20 < d7m / d5m ≤ 2.70. After the light passes through the fifth lens, the path of the light rises steeply, and the refraction angle of the light increases. In order to ensure that the seventh and eighth lenses have sufficient bearing positions, the outer diameters of the sixth, seventh, and eighth lenses also increase suddenly. The non-light-transmitting regions of the lenses cannot be completely blocked by the spacers, and light is likely to be reflected in the non-light-transmitting regions of the eighth lens to generate stray light. In this case, by further restricting the relationship between the outer diameter of the image side of the sixth spacer, the outer diameter of the image side of the fifth spacer, and the outer diameter of the image side of the seventh spacer, and the relationship between the distance between the sixth spacer and the seventh spacer along the optical axis and the maximum thickness of the sixth spacer and the maximum thickness of the seventh spacer, they respectively satisfy 1.50 < D6m / (D7m - D5m) < 2.20 and 0.25 < EP67 / (CP6 + CP7) < 0.75. By reasonably controlling the outer diameters and thicknesses of the image sides of the aforementioned three spacers, the light entering the non-light-transmitting region of the eighth lens is intercepted step by step by the spacers in the radial direction, and the light reflection points in the non-light-transmitting region are ensured; the thickness of the non-light-transmitting region of the eighth lens is restricted axially to ensure the number of internal reflection stray light reflections. To sum up, the size of the non-light-transmitting region of the eighth lens is restricted respectively in the radial and axial directions, thereby increasing the number of light reflections entering the non-light-transmitting region of the eighth lens and reducing the light exit range, effectively reducing the risk of internal reflection stray light in the eighth lens.

[0018] Generally speaking, the present application can reduce the risk of generating stray light in the non-light-transmitting region of the eighth lens while ensuring the miniaturization of the lens and meeting the large image plane imaging characteristics, improve the imaging quality of the optical imaging lens, and enhance the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present application will become easily understandable. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where: Figure 1 A schematic diagram of some structural parameters of the optical imaging lens according to an embodiment of the present application is shown; Figure 2 An optical path diagram of the optical imaging lens according to an embodiment of the present application when d0m / f = 2.0, d7m / d5m = 2.3, D6m / (D7m - D5m) = 1.4, and EP67 / (CP6 + CP7) = 0.23 is shown; Figure 3 The diagram shows stray light spots when the optical imaging lens of this application satisfies d0m / f=2.0, d7m / d5m=2.3, D6m / (D7m-D5m)=1.4, and EP67 / (CP6+CP7)=0.23. Figure 4 The optical path diagram of the optical imaging lens of this application embodiment is shown when d0m / f=2.0, d7m / d5m=2.3, D6m / (D7m-D5m)=2.1, and EP67 / (CP6+CP7)=0.63. Figure 5 The diagram shows stray light spots when the optical imaging lens of this application satisfies d0m / f=2.0, d7m / d5m=2.3, D6m / (D7m-D5m)=2.1, and EP67 / (CP6+CP7)=0.63; Figure 6 The optical path diagram of the optical imaging lens according to an embodiment of this application is shown when d0m / f=2.0, d7m / d5m=2.3, D6m / (D7m-D5m)=2.3, and EP67 / (CP6+CP7)=1.2. Figure 7 The diagram shows stray light spots when the optical imaging lens of this application satisfies d0m / f=2.0, d7m / d5m=2.3, D6m / (D7m-D5m)=2.3, and EP67 / (CP6+CP7)=1.2; Figure 8 A schematic diagram of the structure of the first optical imaging lens in the first embodiment of this application is shown; Figure 9 A schematic diagram of the structure of the second optical imaging lens in the first embodiment of this application is shown; Figure 10 The on-axis chromatic aberration curve of the optical imaging lens of the first embodiment of this application is shown; Figure 11 The astigmatism curve of the optical imaging lens of the first embodiment of this application is shown; Figure 12 The magnification chromatic aberration curve of the optical imaging lens of the first embodiment of this application is shown; Figure 13 A schematic diagram of the structure of the first optical imaging lens in the second embodiment of this application is shown; Figure 14 A schematic diagram of the structure of the second optical imaging lens in the second embodiment of this application is shown; Figure 15 The on-axis chromatic aberration curve of the optical imaging lens of the second embodiment of this application is shown; Figure 16The astigmatism curve of the optical imaging lens of the second embodiment of this application is shown; Figure 17 The magnification chromatic aberration curve of the optical imaging lens of the second embodiment of this application is shown; Figure 18 A schematic diagram of the structure of the first optical imaging lens in the third embodiment of this application is shown; Figure 19 A schematic diagram of the structure of the second optical imaging lens in the third embodiment of this application is shown; Figure 20 The on-axis chromatic aberration curve of the optical imaging lens of the third embodiment of this application is shown; Figure 21 The astigmatism curve of the optical imaging lens of the third embodiment of this application is shown; Figure 22 The magnification chromatic aberration curve of the optical imaging lens of the third embodiment of this application is shown; Figure 23 A schematic diagram of the structure of the first optical imaging lens in the fourth embodiment of this application is shown; Figure 24 A schematic diagram of the structure of the second optical imaging lens in the fourth embodiment of this application is shown; Figure 25 The on-axis chromatic aberration curve of the optical imaging lens of the fourth embodiment of this application is shown; Figure 26 The astigmatism curve of the optical imaging lens of the fourth embodiment of this application is shown; Figure 27 The magnification chromatic aberration curve of the optical imaging lens of the fourth embodiment of this application is shown; Figure 28 A schematic diagram of the optical structure of an optical imaging lens according to an embodiment of this application is shown, showing the imaging surface and the filter. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. For simplicity and clarity, reference numerals may be repeated in the drawings to indicate corresponding or similar elements where deemed appropriate. Furthermore, this application sets forth many specific details to provide a thorough understanding of the embodiments described herein. However, those skilled in the art will understand that the embodiments described herein can be practiced without these specific details. In other instances, well-known methods, processes, and components have not been described in detail so as not to obscure the embodiments described herein. Moreover, this description should not be considered as limiting the scope of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be understood that the possible terms "first" or "second," etc., in the claims, specification, and drawings disclosed in this application are used to distinguish different objects, not to describe a specific order. The expressions "first," "second," "third," etc., are only used to distinguish one feature from another and do not indicate 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. The terms "comprising" and "including" as used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0022] 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 strictly to scale.

[0023] In this paper, the surface of each lens closest to the subject is called the object-side surface, and the surface of each lens closest to the imaging plane is called the image-side surface. For the object-side surface, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; similarly, for the image-side surface, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0024] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0025] In the design of optical imaging lenses, it is necessary to ensure that the lens is miniaturized while also having a large image area and good image quality. However, in order to ensure both ultra-thinness and meet the technical requirements of a large image area, lenses with a large number of elements are prone to problems such as an increased refraction angle of light at the rear end and a corresponding increase in the outer diameter of the lens. This can easily lead to stray light, affecting the overall image quality and user experience.

[0026] In view of this, embodiments of this application provide an optical imaging lens that can reduce the risk of stray light generation, improve the imaging quality of the optical imaging lens, and enhance the user experience while ensuring lens miniaturization and meeting the large image plane imaging characteristics.

[0027] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0028] Figure 1 A schematic diagram showing some structural parameters of the optical imaging lens according to an embodiment of this application is provided. Figure 1 The optical imaging lens in some embodiments of this application may include: The lens barrel and lens group and spacer assembly disposed within the inner cavity of the lens barrel, wherein, along the optical axis of the optical imaging lens from the object side to the image side, the lens group sequentially includes a first lens E1 to an eighth lens E8 having optical power. In some embodiments, along the optical axis of the optical imaging lens from the object side to the image side, the lens group may sequentially include a first lens E1 having positive optical power, a second lens E2 having optical power, a third lens E3 having optical power, a fourth lens E4 having optical power, a fifth lens E5 having negative optical power, a sixth lens E6 having optical power, a seventh lens E7 having positive optical power, and an eighth lens E8 having negative optical power. In addition, the spacer assembly includes a fifth spacer P5 that contacts the image-side surface S10 of the fifth lens E5, a sixth spacer P6 that contacts the image-side surface S12 of the sixth lens E6, and a seventh spacer P7 that contacts the image-side surface S14 of the seventh lens E7. That is, the fifth spacer P5 can contact the image-side surface S10 of the fifth lens E5, the sixth spacer P6 can contact the image-side surface S12 of the sixth lens E6, and the seventh spacer P7 can contact the image-side surface S14 of the seventh lens E7.

[0029] In this embodiment, the target parameters may include, but are not limited to, the inner diameter of the image-side surface of the lens barrel, the effective focal length of the optical imaging lens, the inner diameter of the image-side surface of the seventh spacer, the inner diameter of the image-side surface of the fifth spacer, the outer diameter of the image-side surface of the sixth spacer, the outer diameter of the image-side surface of the fifth spacer, the outer diameter of the image-side surface of the seventh spacer, the spacing between the sixth and seventh spacers along the optical axis, the maximum thickness of the sixth spacer, and the maximum thickness of the seventh spacer. The relationship between these target parameters needs to satisfy the following preset range: 1.85 <d0m / f≤2.10; 2.20 <d7m / d5m≤2.70; 1.50 <D6m / (D7m-D5m)<2.20; 0.25 <EP67 / (CP6+CP7)<0.75。

[0030] Wherein, d0m is the inner diameter of the image-side surface of the lens barrel, f is the effective focal length of the optical imaging lens, d7m is the inner diameter of the image-side surface of the seventh spacer, d5m is the inner diameter of the image-side surface of the fifth spacer, D6m is the outer diameter of the image-side surface of the sixth spacer, D5m is the outer diameter of the image-side surface of the fifth spacer, D7m is the outer diameter of the image-side surface of the seventh spacer, EP67 is the spacing between the sixth and seventh spacers along the optical axis, CP6 is the maximum thickness of the sixth spacer, and CP7 is the maximum thickness of the seventh spacer.

[0031] Please see Figures 2 to 7When some parameters of the target parameters of the optical imaging lens exceed the lower limit of the preset range, for example, d0m / f=2.0, d7m / d5m=2.3, D6m / (D7m-D5m)=1.4, EP67 / (CP6+CP7)=0.23, it can be seen that... Figure 2 In the optical path diagram, the eighth lens has a smaller non-transparent area, resulting in fewer refractings of light within this area. It is evident that... Figure 3 The area of ​​the light spot is large, and the stray white line spot at the inner reflection angle is obvious. When the target parameters of the optical imaging lens are within the preset range, for example, d0m / f=2.0, d7m / d5m=2.3, D6m / (D7m-D5m)=2.1, EP67 / (CP6+CP7)=0.63, it can be seen that... Figure 4 In the optical path diagram, the size of the non-transparent area of ​​the eighth lens is moderate, and the number of times the light rays are reflected in the non-transparent area is moderate. Figure 5 The light spot is small and the light spot energy is weak. When some parameters of the target parameters of the optical imaging lens exceed the upper limit of the preset range, for example, d0m / f=2.0, d7m / d5m=2.3, D6m / (D7m-D5m)=2.3, EP67 / (CP6+CP7)=1.2, it can be seen that... Figure 6 In the optical path diagram, the non-transparent area of ​​the eighth lens is relatively large, resulting in a larger range of stray light transmitted into the eighth lens, and stronger energy. Figure 7 The medium-sized spot has a large area, significant internal stray light, and strong spot energy. This demonstrates that when the relationship between target parameters needs to meet a preset range, the risk of stray light generation can be reduced.

[0032] Optical imaging lenses provided in some embodiments of this application It includes a lens barrel, a lens group, and a spacer assembly disposed in the inner cavity of the lens barrel. By setting the positive and negative optical powers of the lenses to meet the technical feature of a large image plane, the ratio between the inner diameter of the image side of the lens barrel and the effective focal length of the optical imaging lens satisfies 1.85 < d0m / f ≤ 2.10, and the ratio between the inner diameter of the image side of the seventh spacer and the inner diameter of the image side of the fifth spacer satisfies 2.20 < d7m / d5m ≤ 2.70. After the light passes through the fifth lens, the light path rises steeply and the refraction angle of the light increases. To ensure that the seventh and eighth lenses have sufficient bearing positions, the outer diameters of the sixth, seventh, and eighth lenses also increase suddenly. The non-transmissive area of the lens cannot be completely blocked by the spacer, and light is likely to be reflected in the non-transmissive area of the eighth lens to generate stray light. In this case, by further restricting the relationship between the outer diameter of the image side of the sixth spacer, the outer diameter of the image side of the fifth spacer, and the outer diameter of the image side of the seventh spacer, as well as the relationship between the axial spacing distance between the sixth spacer and the seventh spacer and the maximum thickness of the sixth spacer and the maximum thickness of the seventh spacer, they respectively satisfy 1.50 < D6m / (D7m - D5m) < 2.20 and 0.25 < EP67 / (CP6 + CP7) < 0.75. By reasonably controlling the outer diameters and thicknesses of the image sides of the aforementioned three spacers, the spacers can intercept the light entering the non-transmissive area of the eighth lens step by step in the radial direction and ensure the light reflection points in the non-transmissive area; restrict the thickness of the non-transmissive area of the eighth lens axially to ensure the number of internal reflection stray light reflections. To sum up, restrict the size of the non-transmissive area of the eighth lens respectively in the radial and axial directions to increase the number of light reflections entering the non-transmissive area of the eighth lens and reduce the light exit range, effectively reducing the risk of internal reflection stray light in the eighth lens.

[0033] Generally speaking, this application can reduce the risk of generating stray light in the non-transmissive area of the eighth lens while ensuring the miniaturization of the lens and meeting the imaging characteristics of a large image plane, improve the imaging quality of the optical imaging lens, and enhance the user experience.

[0034] In some embodiments, the relationship among the inner diameter d7m of the image side of the seventh spacer, the effective focal length of the eighth lens, and the radius of curvature of the image side of the eighth lens can be further designed. Specifically, the foregoing relationship can satisfy the following conditions: 1.15 ≤ d0m / d7m < 1.35, -2.20 < f8 / R16 < -0.85, where f8 is the effective focal length of the eighth lens and R16 is the radius of curvature of the image side of the eighth lens. As the last lens, the light exits the lens barrel after passing through the eighth lens. By controlling the ratio of the inner diameter of the image side of the seventh spacer to the inner diameter of the image side of the lens barrel, and the ratio of the effective focal length of the eighth lens to the radius of curvature of the image side of the eighth lens, the refractive power of the eighth lens and the light passing aperture of the seventh spacer can be constrained, ensuring the light passing amount while avoiding the exit of excess light, avoiding the reflection of excess light at the structural positions, ensuring the reasonable matching of the mechanical mechanism and improving the imaging quality at the same time.

[0035] In some embodiments, the relationship among the outer diameter D7s of the object side of the seventh spacer, the inner diameter d6s of the object side of the sixth spacer, the axial spacing distance EP67 between the sixth spacer and the seventh spacer along the optical axis, and the maximum thickness CP7 of the seventh spacer can be further designed. Specifically, the foregoing relationship can satisfy the following conditions: 3.80 < (d7m - d6s) / (EP67 + CP7) < 7.20, where d6s is the inner diameter of the object side of the sixth spacer. By controlling the ratio of the inner diameter difference between the inner diameter of the image side of the seventh spacer and the inner diameter of the object side of the sixth spacer to their axial spacing, the rationality of the edge thickness of the seventh lens is ensured to improve the molding stability. At the same time, by adjusting the edge thickness and the spacer thickness, the field curvature can be adjusted, the lens resolution can be improved, and the lens imaging quality can be improved.

[0036] In some embodiments, the relationship among the outer diameter D7s of the object side of the seventh spacer, the outer diameter D6m of the image side of the sixth spacer, and the axial spacing distance EP67 between the sixth spacer and the seventh spacer along the optical axis can be further designed. Specifically, the foregoing relationship can satisfy the following conditions: 3.40 < (D7s - D6m) / EP67 < 7.10, where D7s is the outer diameter of the object side of the seventh spacer. By controlling the ratio of the outer diameter difference between the outer diameter of the object side of the seventh spacer and the outer diameter of the image side of the sixth spacer to their axial spacing, the common bearing of the sixth lens, the seventh lens, and the spacer is ensured to guarantee the assembly stability, and at the same time, it is beneficial to improve the reliability performance of the lens group in a high-temperature environment.

[0037] In some embodiments, the relationship among the combined focal length of the sixth lens and the seventh lens, the inner diameter of the object side of the seventh spacer, and the inner diameter d5m of the image side of the fifth spacer can be further designed. Specifically, the foregoing relationship can satisfy the following condition: 2.25 < f67 / (d7s - d5m) < 2.95, where f67 is the combined focal length of the sixth lens and the seventh lens, and d7s is the inner diameter of the object side of the seventh spacer. The light passes through the aperture of the fifth spacer and then enters the sixth lens and the seventh lens. By optimizing the ratio of the combined focal length of the sixth lens and the seventh lens to the difference in the inner diameters of the fifth spacer and the seventh spacer, the angle of the light entering the sixth lens and the seventh lens can be optimized, the entry of invalid light into the optical system can be restricted, the reflection of the redundant light in the sixth lens and the seventh lens can be avoided, the defocusing, chromatic aberration, and distortion problems caused by the air gap can be effectively eliminated, the stray light spot can be reduced, and the imaging quality can be improved.

[0038] In some embodiments, the relationship among the outer diameter of the object side of the sixth spacer, the inner diameter d5m of the image side of the fifth spacer, and the spacing distance between the fifth spacer and the sixth spacer along the optical axis direction can be further designed. Specifically, the foregoing relationship can satisfy the following condition: 10.70 < (D6s - d5m) / EP56 < 13.05, where D6s is the outer diameter of the object side of the sixth spacer, and EP56 is the spacing distance between the fifth spacer and the sixth spacer along the optical axis direction. By controlling the ratio of the difference between the outer diameter of the object side of the sixth spacer and the inner diameter of the image side of the fifth spacer to the axial spacing therebetween, the common bearing of the front and rear assemblies can be ensured, the assembly stability can be optimized, and at the same time, the thickness of the spacer of the lens can be ensured to be reasonable, and the situation that the spacer is deformed due to the assembly pressure during assembly, resulting in the variation of the optical parameters, can be avoided.

[0039] In some embodiments, the spacer assembly may further include: a second spacer P2 disposed at the image side S4 of the second lens E2, and the second spacer P2 may be in contact with the image side S4 of the second lens E2. Further, the relationship between the effective focal length of the second lens and the effective focal length f of the optical imaging lens and the relationship between the effective focal length of the second lens and the inner diameter of the object side of the second spacer may be further designed. Specifically, the foregoing two relationships may satisfy the following conditions: 1.80 < |f2| / f < 2.80; 3.40 < |f2| / d2s < 6.10, where f2 is the effective focal length of the second lens and d2s is the inner diameter of the object side of the second spacer. By constraining the effective focal length of the second lens E2 and the effective focal length of the optical imaging lens through 1.80 < |f2| / f < 2.80, it helps to improve chromatic aberration, and the light diverges after passing through the second lens. At the same time, by controlling the effective focal length of the second lens and the inner diameter of the object side of the second spacer within a reasonable range through 3.40 < |f2| / d2s < 6.10, imaging problems caused by light leakage due to too long effective focal length of the second lens or too large inner diameter of the object side of the second spacer are avoided, thereby improving the imaging quality.

[0040] In some embodiments, the spacer assembly further includes: a first spacer P1 disposed at the image side S2 of the first lens E1. Further, the relationship between the effective focal length of the first lens, the refractive index of the first lens, and the inner diameter of the object side of the first spacer may be further designed. Specifically, the foregoing relationship may satisfy the following conditions: 1.20 < f1 / N1 / d1s ≤ 1.75, where f1 is the effective focal length of the first lens, N1 is the refractive index of the first lens, and d1s is the inner diameter of the object side of the first spacer. It can effectively control the refraction angle of the system light beam in the first lens, better balance the aberrations of the system, improve the imaging quality, and reasonably control the inner diameter of the object side of the first spacer, which can effectively block the ineffective light reflected in the second lens mechanism and reduce the possibility of stray light generation.

[0041] In some embodiments, the relationship between the effective focal length of the second lens, the effective focal length of the third lens, and the inner diameter d2s of the object side of the second spacer may be further designed. Specifically, the foregoing relationship may satisfy the following conditions: 7.20 < (|f2| + |f3|) / d2s < 13.70, where f2 is the effective focal length of the second lens and f3 is the effective focal length of the third lens. By controlling the ratio between the sum of the absolute values of the effective focal lengths of the second and third lenses and the inner diameter d2s of the object side of the second spacer within a reasonable range, aberration problems caused by too long effective focal lengths of the second and third lenses are avoided, and at the same time, the inner diameter of the second spacer is reasonably constrained to effectively block the internal reflection stray light of the second lens, thereby improving the imaging quality.

[0042] In some embodiments, the relationship among the maximum height of the lens barrel, the effective focal length f of the optical imaging lens, and the maximum field angle of the optical imaging lens can be further designed. Specifically, the foregoing relationship can satisfy the following condition: 0.95 ≤ L / (f * tan(Semi-FOV)) ≤ 1.05, where L is the maximum height of the lens barrel, and Semi-FOV is half of the maximum field angle of the optical imaging lens. By controlling the relationship between the overall size of the lens and the field angle, it is ensured that sufficient field of view is maintained under a compact structure, which can ensure the imaging quality of the entire lens while reducing distortion and aberration.

[0043] In some embodiments, the relationship among the outer diameter of the object side surface of the lens barrel, the inner diameter of the object side surface of the lens barrel, the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer, and the maximum thickness of the non-light-transmitting region of the first lens can be further designed. Specifically, the foregoing relationship can satisfy the following conditions: 1.15 < D0s / d0s < 1.55, 2.10 < EP01 / EB1 < 4.30, where D0s is the outer diameter of the object side surface of the lens barrel, d0s is the inner diameter of the object side surface of the lens barrel, EP01 is the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer, and EB1 is the maximum thickness of the non-light-transmitting region of the first lens. By controlling the ratio of the outer diameter of the object side surface of the lens barrel to the inner diameter of the object side surface of the lens barrel and the ratio of the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element to the maximum thickness of the non-light-transmitting region of the first lens, the top surface bearing position of the lens assembly (the end face of the lens barrel closest to the object side) and the overall thickness ratio of the first lens can be effectively guaranteed, ensuring the structural stability of the object side of the lens.

[0044] In some embodiments, the relationship between the distance along the optical axis from the image side surface of the seventh spacer to the image side end face of the lens barrel and the radius of curvature R16 of the image side surface of the eighth lens can be further designed. Specifically, the foregoing relationship can satisfy the following condition: 0.35 < EP70 / R16 < 0.90, where EP70 is the distance along the optical axis from the image side surface of the seventh spacer to the image side end face of the lens barrel. By the ratio of the two, the distance between the seventh spacer and the image side end face of the lens barrel and the radius of curvature of the image side surface of the eighth lens are restricted, effectively reducing the sensitivity of the system, and further restricting the axial length of the rear end of the lens barrel to ensure assembly stability, thereby improving the yield.

[0045] To more clearly illustrate the performance of the optical imaging lens provided in the embodiments of the present application, several embodiments of the optical imaging lens and the specific numerical designs of the optical parameters of each optical imaging lens in each embodiment are provided below for reference.

[0046] Figure 8 The structural schematic diagram of the first optical imaging lens in the first embodiment of the present application is shown. Figure 9A schematic diagram of the structure of the second optical imaging lens according to the first embodiment of this application is shown. As shown, it includes a first spacer, a second spacer, a third spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer. The first spacer is placed on the image-side surface of the first lens and is in contact with the image-side surface of the first lens. The second spacer is placed on the image-side surface of the second lens and is in contact with the image-side surface of the second lens. The third spacer is placed on the image-side surface of the third lens and is in contact with the image-side surface of the third lens. The fourth spacer is placed on the image-side surface of the fourth lens and is in contact with the image-side surface of the fourth lens. The fifth spacer is placed on the image-side surface of the fifth lens and is in contact with the image-side surface of the fifth lens. The sixth spacer is placed on the image-side surface of the sixth lens and is in contact with the image-side surface of the sixth lens. The seventh spacer is placed on the image-side surface of the seventh lens and is in contact with the image-side surface of the seventh lens. Table 10 shows some structural parameters of the two structures of the optical imaging lens in the first embodiment. The following is a table of optical parameters of each lens in the first and second optical imaging lenses of the first embodiment of this application, as shown in Table 1 below. In the table, the units of radius of curvature and thickness / distance are millimeters (mm): Table 1: .

[0047] The surface numbers in the table above are based on the order in which light rays pass through the lens surfaces during imaging. S1 represents the object-side surface of the first lens E1, S2 represents the image-side surface of the first lens E1, S3 represents the object-side surface of the second lens E2, and so on. In the example, such as... Figure 28 As shown, the eighth lens E8 and the... A filter (E9) can also be disposed between the image planes S19. The filter has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the image plane S19. S17 is not a lens. In addition, OBJ represents the object plane, STO represents the aperture stop, a positive radius of curvature indicates that the surface bends towards the object-side, and a negative radius of curvature indicates that the surface bends towards the image-side.

[0048] The object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical formula (Formula 1): (Formula 1) 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 (i.e., 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. The following are the aspherical parameters of the first and second optical imaging lenses in the first embodiment, where A4, A6…A28, A30 are the coefficients of the 4th, 6th…28th, and 30th order terms of the aspherical polynomial, as shown in Table 2 below: Table 2: .

[0049] Figure 13 A schematic diagram of the structure of the first optical imaging lens in the second embodiment of this application is shown. Figure 14 A schematic diagram of the structure of the second optical imaging lens in the second embodiment of this application is shown. Some parameters of the two structures of the optical imaging lens in the second embodiment are shown in Table 10. The relationship between the lens and the spacer in the first and second optical imaging lenses of the second embodiment of this application is the same as in the first embodiment, and will not be repeated here. The following is a table of optical parameters for each lens in the first and second optical imaging lenses of the second embodiment of this application, as shown in Table 3 below. The units for radius of curvature and thickness / distance are millimeters (mm): Table 3: .

[0050] The following are the aspherical parameters of the first and second optical imaging lenses in the second embodiment, where A4, A6…A28, and A30 are the coefficients of the 4th, 6th…28th, and 30th order terms of the aspherical polynomial. The shape of each aspherical surface can be defined by formula (1) given in the above embodiment 1, as shown in Table 4 below: Table 4: .

[0051] Figure 18 A schematic diagram of the structure of the first optical imaging lens in the third embodiment of this application is shown. Figure 19 A schematic diagram of the structure of the second optical imaging lens in the third embodiment of this application is shown. Some parameters of the two structures of the optical imaging lens in the third embodiment are shown in Table 10. The relationship between the lens and the spacer in the first and second optical imaging lenses of the third embodiment of this application is the same as in the first embodiment, and will not be repeated here. The following is a table of optical parameters for each lens in the first and second optical imaging lenses of the third embodiment of this application, as shown in Table 5 below. The units for radius of curvature and thickness / distance are millimeters (mm): Table 5: .

[0052] The following are the aspherical parameters of the first and second optical imaging lenses in the third embodiment, where A4, A6…A28, and A30 are the coefficients of the 4th, 6th…28th, and 30th order terms of the aspherical polynomial. The shape of each aspherical surface can be defined by formula (1) given in embodiment 1 above, as shown in Table 6 below: Table 6: .

[0053] Figure 23 A schematic diagram of the structure of the first optical imaging lens in the fourth embodiment of this application is shown. Figure 24 A schematic diagram of the structure of the second optical imaging lens in the fourth embodiment of this application is shown. Some parameters of the two structures of the optical imaging lens in the fourth embodiment are shown in Table 10. The relationship between the lens and the spacer in the first and second optical imaging lenses of the fourth embodiment of this application is the same as in the first embodiment, and will not be repeated here. The following is a table of optical parameters for each lens in the first and second optical imaging lenses of the fourth embodiment of this application, as shown in Table 7 below. The units for radius of curvature and thickness / distance are millimeters (mm): Table 7: .

[0054] The following are the aspherical parameters of the first and second optical imaging lenses in the fourth embodiment, where A4, A6…A28, and A30 are the coefficients of the 4th, 6th…28th, and 30th order terms of the aspherical polynomial. The shape of each aspherical surface can be defined by formula (1) given in embodiment 1 above, as shown in Table 8 below: Table 8: .

[0055] Furthermore, the optical parameters of the first to fourth embodiments are shown in Table 9 below: Table 9: .

[0056] Where f1 represents the effective focal length of the first lens E1, f2 represents the effective focal length of the second lens E2, and so on. f represents the effective focal length of the optical imaging lens, f67 represents the combined focal length of the sixth lens E6 and the seventh lens E7, and Semi-FOV is half of the maximum field of view of the optical imaging lens. Furthermore, some structural data from the first to fourth embodiments are shown in Table 10 below, where all parameters are in millimeters (mm): Table 10: .

[0057] In the table above, 1-1 represents the first optical imaging lens of the first embodiment, 1-2 represents the second optical imaging lens of the first embodiment, 2-1 represents the first optical imaging lens of the second embodiment, and so on.

[0058] Furthermore, the relationship between the target parameters of the first to fourth embodiments is shown in Table 11 below: Table 11: .

[0059] See Figures 10 to 12 , Figures 15 to 17 , Figures 20 to 22 and Figures 25 to 27 The on-axis chromatic aberration curve represents the degree of focal point deviation of light of different wavelengths after passing through the optical imaging lens. It is evident that the focal point deviation of the optical imaging lenses in the first to fourth embodiments is relatively low. The astigmatism curve represents the meridional and sagittal image plane curvature corresponding to different image heights. It is evident that the meridional and sagittal image plane curvatures of the optical imaging lenses in the first to fourth embodiments are relatively low. The magnification chromatic aberration curve represents the deviation of light at different image heights on the imaging plane after passing through the lens. It is evident that the deviation of the optical imaging lenses in the first to fourth embodiments at different image heights on the imaging plane is relatively low. Therefore, the optical imaging lenses in the first to fourth embodiments all possess good imaging quality.

[0060] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An optical imaging lens, characterized in that, Comprising: A lens barrel and a lens group and a spacer assembly disposed in the inner cavity of the lens barrel; Along the optical axis of the optical imaging lens from the object side to the image side, the lens group consists of a first lens to an eighth lens having optical powers; wherein, The first lens has a positive optical power, the object side surface of the first lens is convex, and the image side surface is concave; The object side surface of the second lens is convex, and the image side surface is concave; The object side surface of the third lens is convex, and the image side surface is concave; The fifth lens has a negative optical power, and the image side surface of the fifth lens is concave; The seventh lens has a positive optical power, and the object side surface of the seventh lens is convex; The eighth lens has a negative optical power, and the image side surface of the eighth lens is concave; The optical powers of the second lens, the third lens, the fourth lens and the sixth lens satisfy any one of the following combinations: The second lens has a negative optical power, the third lens has a positive optical power, the fourth lens has a negative optical power, and the sixth lens has a positive optical power; or The second lens has a negative optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, and the sixth lens has a negative optical power; or The second lens has a positive optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, and the sixth lens has a negative optical power; or The second lens has a negative optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, and the sixth lens has a positive optical power; The spacer assembly includes a fifth spacer contactingly disposed at the image side surface of the fifth lens, a sixth spacer contactingly disposed at the image side surface of the sixth lens, and a seventh spacer contactingly disposed at the image side surface of the seventh lens; 1.85 < d0m / f ≤ 2.10; 2.20 < d7m / d5m ≤ 2.70; 1.50 < D6m / (D7m - D5m) < 2.20; 0.25 < EP67 / (CP6 + CP7) < 0.75; Wherein, d0m is the inner diameter of the image side surface of the lens barrel, f is the effective focal length of the optical imaging lens, d7m is the inner diameter of the image side surface of the seventh spacer, d5m is the inner diameter of the image side surface of the fifth spacer, D6m is the outer diameter of the image side surface of the sixth spacer, D5m is the outer diameter of the image side surface of the fifth spacer, D7m is the outer diameter of the image side surface of the seventh spacer, EP67 is the spacing distance between the sixth spacer and the seventh spacer along the optical axis direction, CP6 is the maximum thickness of the sixth spacer, CP7 is the maximum thickness of the seventh spacer; and 2. The optical imaging lens according to claim 1, characterized in that, -2.20 < f8 / R16 < -0.85, wherein, f8 is the effective focal length of the eighth lens, and R16 is the curvature radius of the image side surface of the eighth lens.

3. The optical imaging lens according to claim 1, characterized in that, 1.15 ≤ d0m / d7m < 1.

35. 3.80 < (d7m - d6s) / (EP67 + CP7) < 7.20; 4. The optical imaging lens according to claim 1, characterized in that, Wherein, d6s is the inner diameter of the object side surface of the sixth spacer. 3.40 < (D7s - D6m) / EP67 < 7.10; Wherein, D7s is the outer diameter of the object side surface of the seventh spacer.

5. The optical imaging lens according to claim 1, characterized in that, 2.25 <f67 / (d7s-d5m)<2.95; Wherein, f67 is the combined focal length of the sixth lens and the seventh lens, and d7s is the inner diameter of the object side surface of the seventh spacer.

6. The optical imaging lens according to claim 1, characterized in that, 10.70 < (D6s - d5m) / EP56 < 13.05; Wherein, D6s is the outer diameter of the object side of the sixth spacer, and EP56 is the distance between the fifth spacer and the sixth spacer along the optical axis.

7. The optical imaging lens according to claim 1, characterized in that, The spacing assembly further includes: a second spacer, which is disposed in contact with the image side of the second lens; 1.80<|f2| / f<2.80; 3.40<|f2| / d2s<6.10; Where f2 is the effective focal length of the second lens, and d2s is the inner diameter of the object side of the second spacer.

8. The optical imaging lens according to claim 1, characterized in that, The spacing assembly further includes: a first spacer, which is disposed in contact with the image side of the first lens; 1.20 <f1 / N1 / d1s≤1.75; Where f1 is the effective focal length of the first lens, N1 is the refractive index of the first lens, and d1s is the inner diameter of the object side of the first spacer.

9. The optical imaging lens according to claim 7, characterized in that, 7.20 < (|f2| + |f3|) / d2s < 13.70; Where f2 is the effective focal length of the second lens and f3 is the effective focal length of the third lens.

10. The optical imaging lens according to claim 1, characterized in that, 0.95 ≤ L / (f) tan(Semi-FOV))≤1.05; Where L is the maximum height of the lens barrel, and Semi-FOV is half of the maximum field of view of the optical imaging lens.

11. The optical imaging lens according to claim 8, characterized in that, 1.15 <D0s / d0s<1.55; 2.10 <EP01 / EB1<4.30; Wherein, D0s is the outer diameter of the object side surface of the lens barrel, d0s is the inner diameter of the object side surface of the lens barrel, EP01 is the distance from the object side surface of the lens barrel to the object side surface of the first spacer along the optical axis, and EB1 is the maximum thickness of the non-transparent area of ​​the first lens.

12. The optical imaging lens according to any one of claims 1-8, characterized in that, 0.35 <EP70 / R16<0.90; Wherein, EP70 is the distance along the optical axis from the image-side surface of the seventh spacer to the image-side end face of the lens barrel, and R16 is the radius of curvature of the image-side surface of the eighth lens.

Images