Optical lens

Abstract

The application provides an optical lens. The optical lens comprises a lens barrel, a lens set and a spacer component accommodated in the lens barrel; the lens set comprises, in sequence from an object side to an image side along an optical axis direction: a first lens with positive refractive power, a second lens with refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens with positive refractive power, a seventh lens with negative refractive power and an eighth lens with negative refractive power; a center thickness of the second lens is the minimum value among center thicknesses of all lenses with refractive power; the optical lens satisfies: 1.20 < L / (D0m-D0s) < 1.65, 9.05 < d2s / T23 <= 12.70, 1.45 < (EP12+CP2) / CT2 <= 2.05.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and in particular to an optical lens. Background Technology

[0002] Currently, optical lenses are constantly evolving towards larger apertures, higher image quality, and smaller sizes to meet the ever-increasing performance requirements of mobile terminal devices.

[0003] Typically, optical lenses correct aberrations and improve resolution by increasing the number of lenses. However, increasing the number of lenses also increases system complexity and assembly precision requirements, leading to insufficient assembly stability and potential deviations in the gaps between lenses. Simultaneously, the increased number of lenses also increases system sensitivity, meaning even slight deviations in the gap dimensions between lenses can significantly degrade image quality. Summary of the Invention

[0004] This application provides an optical lens, including a lens barrel and a lens group and a spacer assembly housed within the lens barrel;

[0005] The lens group comprises, arranged sequentially from the object side to the image side along the optical axis: a first lens with positive optical power, a second lens with optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power; the center thickness of the second lens is the minimum value among the center thicknesses of all the lenses with optical power.

[0006] The spacing assembly includes a first spacing element located between the first lens and the second lens and in contact with the image side of the first lens, and a second spacing element located between the second lens and the third lens and in contact with the image side of the second lens.

[0007] The optical lens satisfies the following conditions: 1.20 < L / (D0m-D0s) < 1.65, 9.05 < d2s / T23 ≤ 12.70, and 1.45 < (EP12+CP2) / CT2 ≤ 2.05;

[0008] Wherein, L is the length of the lens barrel, D0m is the outer diameter of the image-side end face of the lens barrel, D0s is the outer diameter of the object-side end face of the lens barrel, d2s is the inner diameter of the object-side side face of the second spacer element, T23 is the air gap between the second lens and the third lens on the optical axis, EP12 is the distance between the image-side face of the first spacer element and the object-side face of the second spacer element along the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis, and CT2 is the center thickness of the second lens.

[0009] In some embodiments of this application, the spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the optical lens satisfies: 4.00 < f5 / (d4m+d5s) < 7.95; where f5 is the effective focal length of the fifth lens, d4m is the inner diameter of the image-side surface of the fourth spacer element, and d5s is the inner diameter of the object-side surface of the fifth spacer element.

[0010] In some embodiments of this application, the spacer assembly includes a third spacer element located between the third lens and the fourth lens and in contact with the image side of the third lens; the optical lens satisfies: 6.45 < d3s / (CT3+T34) < 8.40; where d3s is the inner diameter of the object side of the third spacer element, CT3 is the center thickness of the third lens, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

[0011] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: 0.20 < R13 / R14×N7 ≤ 0.95 and 2.00 < EP67 / CT7 < 4.25; wherein, R13 is the radius of curvature of the object-side surface of the seventh lens, R14 is the radius of curvature of the image-side surface of the seventh lens, N7 is the refractive index of the seventh lens, EP67 is the distance along the optical axis between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element, and CT7 is the center thickness of the seventh lens.

[0012] In some embodiments of this application, the optical lens satisfies: 3.10 < (d2m + D2m) / R4 ≤ 4.20; where d2m is the inner diameter of the image-side surface of the second spacer element, D2m is the outer diameter of the image-side surface of the second spacer element, and R4 is the radius of curvature of the image-side surface of the second lens.

[0013] In some embodiments of this application, the optical lens satisfies: 9.55 ≤ f1 / EP01 < 14.10; where f1 is the effective focal length of the first lens, and EP01 is the distance along the optical axis between the object-side end face of the lens barrel and the object-side surface of the first spacer element.

[0014] In some embodiments of this application, the spacer assembly includes a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical lens satisfies: 0.40 < EP34 / (T45 + CP4) < 1.05; where EP34 is the distance along the optical axis between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and CP4 is the maximum thickness of the fourth spacer element along the optical axis.

[0015] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image side of the sixth lens; the optical lens satisfies: 1.85 < f56 / (D6s-d6s) < 4.95; where f56 is the combined focal length of the fifth lens and the sixth lens, D6s is the outer diameter of the object side of the sixth spacer element, and d6s is the inner diameter of the object side of the sixth spacer element.

[0016] In some embodiments of this application, the spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical lens satisfies: 2.15 < f5 / R9 < 6.85 and 1.45 ≤ R9 / d4m < 6.80; where f5 is the effective focal length of the fifth lens, R9 is the radius of curvature of the object-side surface of the fifth lens, and d4m is the inner diameter of the image-side surface of the fourth spacer element.

[0017] In some embodiments of this application, the spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image side of the fourth lens; the optical lens satisfies: 10.85 < d4s / CT4×N4 < 14.95; where d4s is the inner diameter of the object side of the fourth spacer element, CT4 is the center thickness of the fourth lens, and N4 is the refractive index of the fourth lens.

[0018] In some embodiments of this application, the spacer assembly includes a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image side of the seventh lens; the optical lens satisfies: 0.65 < T67 / (CP7+T78) ≤ 10.25; where T67 is the air gap between the sixth lens and the seventh lens on the optical axis, CP7 is the maximum thickness of the seventh spacer element along the optical axis, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis.

[0019] In some embodiments of this application, the optical lens satisfies: -5.60 < (R4 + R5) / d2s < -3.05; where R4 is the image-side radius of curvature of the second lens, R5 is the object-side radius of curvature of the third lens, and d2s is the object-side inner diameter of the second spacer element.

[0020] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: 1.40≤f67 / (CT6+EP67+CT7)<3.10; where f67 is the combined focal length of the sixth lens and the seventh lens, CT6 is the center thickness of the sixth lens, EP67 is the distance along the optical axis between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element, and CT7 is the center thickness of the seventh lens.

[0021] In some embodiments of this application, the spacing assembly includes a seventh spacing element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: -1.85≤f7 / (d7s+d7m)<-0.50; where f7 is the effective focal length of the seventh lens, d7s is the inner diameter of the object-side surface of the seventh spacing element, and d7m is the inner diameter of the image-side surface of the seventh spacing element.

[0022] In some embodiments of this application, the spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the optical lens satisfies: 10.35 < D5s / (EP45+CP5) ≤ 17.05; where D5s is the outer diameter of the object-side surface of the fifth spacer element, EP45 is the distance between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and CP5 is the maximum thickness of the fifth spacer element along the optical axis.

[0023] In the optical lens of this application, to ensure lens miniaturization and avoid excessively steep light gradients between the second and third lenses, preventing insufficient rearward light transmission, the following conditions must be met: 1.20 < L / (D0m-D0s) < 1.65 and 9.05 < d2s / T23 ≤ 12.70. Under these conditions, the center thickness of the second lens is the minimum among all lenses with optical power. Furthermore, the second lens is highly sensitive to changes in its gap and is easily affected by changes in its nearby axial dimensions, leading to image blurring. Therefore, this application balances the assembly stability and axial dimension sensitivity of the second lens by constraining the range of (EP12+CP2) / CT2, which helps control the field curvature of each field of view within a reasonable range and improves image quality. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structural parameters of an optical lens according to one embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the structure of an optical lens according to Embodiment 1 of this application;

[0026] Figure 3 This is a schematic diagram of the structure of an optical lens according to Embodiment 2 of this application;

[0027] Figure 4 This is a schematic diagram of the structure of an optical lens according to Embodiment 3 of this application;

[0028] Figure 5A A schematic diagram of the magnification chromatic aberration curves of the optical lenses according to the above-described Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown.

[0029] Figure 5B A schematic diagram of the astigmatism curves of the optical lenses according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown.

[0030] Figure 5C The diagram shows the distortion curves of the optical lenses according to the above-described Embodiment 1, Embodiment 2, and Embodiment 3 of this application;

[0031] Figure 6 This is a schematic diagram of the structure of an optical lens according to Embodiment 4 of this application;

[0032] Figure 7 This is a schematic diagram of the structure of an optical lens according to Embodiment 5 of this application;

[0033] Figure 8 This is a schematic diagram of the structure of an optical lens according to Embodiment Six of this application;

[0034] Figure 9A A schematic diagram of the magnification chromatic aberration curves of the optical lenses of Embodiments 4, 5, and 6 according to this application is shown.

[0035] Figure 9B A schematic diagram of the astigmatism curves of the optical lenses according to Embodiments 4, 5 and 6 of this application is shown.

[0036] Figure 9C The diagram shows the distortion curves of the optical lenses according to Embodiments 4, 5 and 6 of this application.

[0037] Figure 10 This is a schematic diagram of the structure of an optical lens according to Embodiment Seven of this application;

[0038] Figure 11 This is a schematic diagram of the structure of an optical lens according to Embodiment 8 of this application;

[0039] Figure 12 This is a schematic diagram of the structure of an optical lens according to Embodiment Nine of this application;

[0040] Figure 13A A schematic diagram of the magnification chromatic aberration curves of the optical lenses of Embodiments 7, 8, and 9 according to this application is shown.

[0041] Figure 13B A schematic diagram of the astigmatism curves of the optical lenses according to Embodiments 7, 8 and 9 of this application is shown.

[0042] Figure 13C A schematic diagram of the distortion curves of the optical lenses according to Embodiments 7, 8 and 9 of this application is shown.

[0043] Figure 14 The modulation transfer function curves of the optical lens are shown when L / (D0m-D0s)=1.48, d2s / T23=11.55 and (EP12+CP2) / CT2=1.82;

[0044] Figure 15 The modulation transfer function curves of the optical lens are shown when L / (D0m-D0s)=1.48, d2s / T23=11.55 and (EP12+CP2) / CT2=1.25;

[0045] Figure 16 The modulation transfer function curves of the optical lens are shown when L / (D0m-D0s)=1.48, d2s / T23=11.55 and (EP12+CP2) / CT2=2.53. Detailed Implementation

[0046] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0048] 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.

[0049] In this paper, the paraxial region refers to the area near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined by the sign of the R value (R refers to the radius of curvature of the paraxial region). 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, when the R value is positive, it is considered convex, and when the R value is negative, it is considered concave; for the image-side surface, when the R value is positive, it is considered concave, and when the R value is negative, it is considered convex.

[0050] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0051] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] like Figure 1 As shown, one embodiment of this application provides an optical lens, which includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel;

[0054] The lens group comprises, arranged sequentially from the object side to the image side along the optical axis: a first lens with positive optical power, a second lens with optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power; the center thickness of the second lens is the minimum value among the center thicknesses of all the lenses with optical power.

[0055] The spacing assembly includes a first spacing element located between the first lens and the second lens and in contact with the image side of the first lens, and a second spacing element located between the second lens and the third lens and in contact with the image side of the second lens.

[0056] The optical lens satisfies the following conditions: 1.20 < L / (D0m-D0s) < 1.65, 9.05 < d2s / T23 ≤ 12.70, and 1.45 < (EP12+CP2) / CT2 ≤ 2.05;

[0057] Wherein, L is the length of the lens barrel, D0m is the outer diameter of the image-side end face of the lens barrel, D0s is the outer diameter of the object-side end face of the lens barrel, d2s is the inner diameter of the object-side side face of the second spacer element, T23 is the air gap between the second lens and the third lens on the optical axis, EP12 is the distance between the image-side face of the first spacer element and the object-side face of the second spacer element along the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis, and CT2 is the center thickness of the second lens.

[0058] In the above embodiments of this application, to ensure lens miniaturization and avoid excessively steep light gradients between the second and third lenses, thus preventing insufficient rearward light transmission, the following conditions must be met: 1.20 < L / (D0m-D0s) < 1.65 and 9.05 < d2s / T23 ≤ 12.70. Under these conditions, the center thickness of the second lens is the minimum among all lenses with optical power, and the second lens is highly sensitive to changes in its gap, easily affected by changes in its nearby axial dimensions, leading to image blurring. Therefore, this application, by constraining the range of (EP12+CP2) / CT2, can balance the assembly stability and axial dimension sensitivity of the second lens, which is beneficial for controlling the field curvature of each field of view within a reasonable range and improving image quality.

[0059] For example, Figure 14 The modulation transfer function curves of the optical lens are shown when L / (D0m-D0s)=1.48, d2s / T23=11.55 and (EP12+CP2) / CT2=1.82; Figure 15 The modulation transfer function curves of the optical lens are shown when L / (D0m-D0s)=1.48, d2s / T23=11.55 and (EP12+CP2) / CT2=1.25; Figure 16 The modulation transfer function curves of the optical lens are shown when L / (D0m-D0s)=1.48, d2s / T23=11.55, and (EP12+CP2) / CT2=2.53. It is easy to see from the figure that: Figure 14 As shown, when the relationship (EP12+CP2) / CT2 is within the range of greater than 1.45 and not greater than 2.05, the optical lens architecture design is reasonable, balancing the assembly stability and axial dimensional sensitivity in this area, and the defocus curve is good; as Figure 15 As shown, when the relationship (EP12+CP2) / CT2 is less than 1.45, the spacer element provides insufficient support, weakening the fixing effect on the second lens. This makes the second lens prone to displacement, leading to image plane drift and a negative field curvature in the external field of view, thus affecting image quality. Figure 16As shown, when the relationship (EP12+CP2) / CT2 is greater than 2.05, it will cause the second spacer element to be too thick, which will encroach on the lens space, which is not conducive to the correction of spherical aberration and coma, and the field curvature of the external field of view will be positive, affecting the imaging quality.

[0060] In some embodiments of this application, the spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the optical lens satisfies: 4.00 < f5 / (d4m+d5s) < 7.95; where f5 is the effective focal length of the fifth lens, d4m is the inner diameter of the image-side surface of the fourth spacer element, and d5s is the inner diameter of the object-side surface of the fifth spacer element.

[0061] If the inner diameter of the spacer element is too small, edge rays may be blocked or severe aberrations may occur, affecting image quality. By constraining f5 / (d4m+d5s), the inner diameter of adjacent spacers can be controlled. This ensures that while the fifth lens has relatively weak converging ability (long focal length), there is enough space for edge rays to pass through smoothly and participate in imaging, thus improving image quality.

[0062] In some embodiments of this application, the spacer assembly includes a third spacer element located between the third lens and the fourth lens and in contact with the image side of the third lens; the optical lens satisfies: 6.45 < d3s / (CT3+T34) < 8.40; where d3s is the inner diameter of the object side of the third spacer element, CT3 is the center thickness of the third lens, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

[0063] By controlling the range of d3s / (CT3+T34), the aperture angle of the outgoing beam can be effectively constrained, and a wider channel can be provided for edge rays, allowing more edge rays to smoothly enter subsequent lenses and participate in imaging. This increases the light throughput in the edge area of ​​the lens, eliminating edge vignetting while ensuring the stability of lens assembly and the effectiveness of aberration correction.

[0064] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: 0.20 < R13 / R14×N7 ≤ 0.95 and 2.00 < EP67 / CT7 < 4.25; wherein, R13 is the radius of curvature of the object-side surface of the seventh lens, R14 is the radius of curvature of the image-side surface of the seventh lens, N7 is the refractive index of the seventh lens, EP67 is the distance along the optical axis between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element, and CT7 is the center thickness of the seventh lens.

[0065] Limiting the range of R13 / R14×N7 effectively controls spherical aberration and coma, but it can easily lead to insufficient convergence of edge rays. Edge field rays may not be accurately focused on the imaging plane, resulting in problems such as blurred edge field of view and reduced brightness. Further constraining EP67 / CT7 optimizes the propagation path of edge rays behind the seventh lens, ensuring accurate focusing of edge rays on the imaging plane and improving the brightness and sharpness of the edge field of view.

[0066] In some embodiments of this application, the optical lens satisfies: 3.10 < (d2m + D2m) / R4 ≤ 4.20; where d2m is the inner diameter of the image-side surface of the second spacer element, D2m is the outer diameter of the image-side surface of the second spacer element, and R4 is the radius of curvature of the image-side surface of the second lens.

[0067] By limiting the range of (d2m+D2m) / R4, the performance of the optical system can be optimized. This avoids insufficient support for the second lens due to an excessively small (d2m+D2m) / R4 or stress concentration in the second lens due to an excessively large (d2m+D2m) / R4. It also enables the second spacer element to provide uniform radial support force for the second lens, reducing the risk of eccentricity during the assembly of the second lens and improving the assembly stability of the optical lens.

[0068] In some embodiments of this application, the optical lens satisfies: 9.55 ≤ f1 / EP01 < 14.10; where f1 is the effective focal length of the first lens, and EP01 is the distance along the optical axis between the object-side end face of the lens barrel and the object-side surface of the first spacer element.

[0069] By constraining the range of f1 / EP01, it is helpful to balance the converging ability and structural size of the first lens. This ensures that the first lens has sufficient converging ability while maintaining the assembly stability of the first lens, which is beneficial to achieving a compact lens structure.

[0070] In some embodiments of this application, the spacer assembly includes a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical lens satisfies: 0.40 < EP34 / (T45 + CP4) < 1.05; where EP34 is the distance along the optical axis between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and CP4 is the maximum thickness of the fourth spacer element along the optical axis.

[0071] By constraining the range of EP34 / (T45+CP4), the transmission path of light can be prevented from deviating excessively from the optical axis. While ensuring that the fourth lens can obtain sufficient aberration correction space, the structure of the fourth lens can still have sufficient rigidity and stability, which helps to balance the optical performance and mechanical reliability of the fourth lens.

[0072] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image side of the sixth lens; the optical lens satisfies: 1.85 < f56 / (D6s-d6s) < 4.95; where f56 is the combined focal length of the fifth lens and the sixth lens, D6s is the outer diameter of the object side of the sixth spacer element, and d6s is the inner diameter of the object side of the sixth spacer element.

[0073] By constraining the range of f56 / (D6s-d6s), it is ensured that light can propagate as required by the design when passing through the object side of the sixth spacer element. At the same time, the object side of the sixth spacer element can effectively intercept large-angle non-imaging light rays, avoiding excessive scattering or reflection of light in the edge area, thereby improving the edge imaging quality and ensuring the relative illumination of the outer field of view.

[0074] In some embodiments of this application, the spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical lens satisfies: 2.15 < f5 / R9 < 6.85 and 1.45 ≤ R9 / d4m < 6.80; where f5 is the effective focal length of the fifth lens, R9 is the radius of curvature of the object-side surface of the fifth lens, and d4m is the inner diameter of the image-side surface of the fourth spacer element.

[0075] By limiting f5 / R9 within a reasonable range, the radius of curvature of the object side surface and the optical power of the fifth lens can be rationally allocated. This constrains the aperture of the light entering the fifth lens, which helps control the direction of light deflection. The imaging light can smoothly pass through the fourth spacer element and enter the fifth lens, thereby reducing the deflection of large-angle light. Further controlling R9 / d4m can block excess light from entering the fifth lens, effectively reducing stray light generation and thus improving the image quality of the lens.

[0076] In some embodiments of this application, the spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image side of the fourth lens; the optical lens satisfies: 10.85 < d4s / CT4×N4 < 14.95; where d4s is the inner diameter of the object side of the fourth spacer element, CT4 is the center thickness of the fourth lens, and N4 is the refractive index of the fourth lens.

[0077] By constraining the range of d4s / CT4×N4, the incident direction and trajectory of effective light can be controlled. At the same time, the fourth spacer element can effectively intercept stray light scattered at the edge of the fourth lens and prevent it from entering the imaging area, avoiding the formation of unnecessary bright spots or halos in the image and improving the contrast of the picture.

[0078] In some embodiments of this application, the spacer assembly includes a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image side of the seventh lens; the optical lens satisfies: 0.65 < T67 / (CP7+T78) ≤ 10.25; where T67 is the air gap between the sixth lens and the seventh lens on the optical axis, CP7 is the maximum thickness of the seventh spacer element along the optical axis, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis.

[0079] By controlling the range of T67 / (CP7+T78), the air gap between lenses can be adjusted, which helps to increase the structural stability of the optical lens, while effectively correcting aberrations such as spherical aberration and coma, and improving image clarity.

[0080] In some embodiments of this application, the optical lens satisfies: -5.60 < (R4 + R5) / d2s < -3.05; where R4 is the image-side radius of curvature of the second lens, R5 is the object-side radius of curvature of the third lens, and d2s is the object-side inner diameter of the second spacer element.

[0081] By constraining the range of (R4+R5) / d2s, the focal points of the edge rays and the center rays on the imaging plane can be made closer after refraction, ensuring the ability to correct astigmatism and coma, thereby obtaining a clear and sharp image, while also ensuring the light transmission and the stability of the lens assembly.

[0082] In some embodiments of this application, the spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: 1.40≤f67 / (CT6+EP67+CT7)<3.10; where f67 is the combined focal length of the sixth lens and the seventh lens, CT6 is the center thickness of the sixth lens, EP67 is the distance along the optical axis between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element, and CT7 is the center thickness of the seventh lens.

[0083] By constraining the range of f67 / (CT6+EP67+CT7), the sixth and seventh lenses can be arranged reasonably within a limited space. This avoids excessive refraction of light between lenses due to excessive compactness or looseness of the lenses. While ensuring the rationality and stability of the system's structural layout, it effectively corrects the system's magnification chromatic aberration and field curvature, and improves the imaging clarity and color consistency of the edge field of view.

[0084] In some embodiments of this application, the spacing assembly includes a seventh spacing element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: -1.85≤f7 / (d7s+d7m)<-0.50; where f7 is the effective focal length of the seventh lens, d7s is the inner diameter of the object-side surface of the seventh spacing element, and d7m is the inner diameter of the image-side surface of the seventh spacing element.

[0085] By constraining the range of f7 / (d7s+d7m), it is ensured that all imaging rays (including edge field rays) can pass smoothly through the seventh spacer element, reducing the angle deviation of light refraction and reducing the excess stray light reflected from the inner diameter of the seventh spacer element, thereby improving the image quality of the edge field and enhancing the overall image quality.

[0086] In some embodiments of this application, the spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the optical lens satisfies: 10.35 < D5s / (EP45+CP5) ≤ 17.05; where D5s is the outer diameter of the object-side surface of the fifth spacer element, EP45 is the distance between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and CP5 is the maximum thickness of the fifth spacer element along the optical axis.

[0087] By constraining the range of D5s / (EP45+CP5), it is beneficial to control the processing, forming, and assembly of the fourth spacer element, the fifth lens, and the fifth spacer element, avoid mutual interference, and ensure the assembly stability of the fourth spacer element, the fifth lens, and the fifth spacer element; at the same time, the fifth spacer element, as an effective light-shielding structure, can intercept stray light generated at the edge of the fifth lens and prevent it from entering subsequent lenses, thereby achieving the effect of suppressing stray light.

[0088] It should be noted that those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of spacers constituting the optical lens can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit this. For example, the optical lens may also include other numbers of spacers than those described in the above embodiments, as needed.

[0089] The following describes some specific, non-limiting embodiments of the above-described embodiments of this application in more detail with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical lens (not shown in the figures), STO represents the aperture stop (not shown in the figures), S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the third lens E3, S6 represents the image-side plane of the third lens E3, S7 represents the object-side plane of the fourth lens E4, S8 represents the image-side plane of the fourth lens E4, and S9 represents... S10 represents the object-side surface of the fifth lens E5, S11 represents the image-side surface of the fifth lens E5, S12 represents the image-side surface of the sixth lens E6, S13 represents the object-side surface of the seventh lens E7, S14 represents the image-side surface of the seventh lens E7, S15 represents the object-side surface of the eighth lens E8, S16 represents the image-side surface of the eighth lens E8, S17 represents the object-side surface of the filter, S18 represents the image-side surface of the filter, and S19 represents the imaging plane (S17, S18, S19 are as follows). Figure 2 As shown in the attached figures, the rest are omitted.

[0090] Example 1

[0091] like Figure 2 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel. The lens group includes, arranged sequentially from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0092] The spacing assembly includes a first spacing element P1 located between the first lens E1 and the second lens E2 and in contact with the image-side surface S2 of the first lens E1; a second spacing element P2 located between the second lens E2 and the third lens E3 and in contact with the image-side surface S4 of the second lens E2; a third spacing element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image-side surface S6 of the third lens E3; a fourth spacing element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface S8 of the fourth lens E4; a fifth spacing element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface S10 of the fifth lens E5; a sixth spacing element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image-side surface S12 of the sixth lens E6; a sixth auxiliary spacing element P6b located between the sixth spacing element P6 and the seventh lens E7 and in contact with the image-side surface of the sixth spacing element P6; and a seventh spacing element P7 located between the seventh lens E7 and the eighth lens E8 and in contact with the image-side surface S14 of the seventh lens E7.

[0093] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave; the third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave; the fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave; the fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave; the sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex; the seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex; and the eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave.

[0094] In addition, Table 1 shows the basic optical parameters of the optical lens of Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0095] Table 1: Basic optical parameters of the optical lens in Example 1

[0096]

[0097] In this embodiment, the image-side surface S16 of the eighth lens E8 is spherical, and any one of the lens surfaces from the object-side surface S1 of the first lens E1 to the object-side surface S15 of the eighth lens E8 is aspherical. The following aspherical formulas can be used for limitation:

[0098] ;

[0099] in, Let be the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirrors S1 to S16 in Example 1.

[0100] Table 2-1: Aspherical coefficient table of the optical lens in Example 1

[0101]

[0102] Table 2-2: Aspherical coefficients of the optical lens in Example 1

[0103]

[0104] Example 2

[0105] like Figure 3 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel. The number and arrangement of the lenses in the lens group are the same as in Embodiment 1, and the number and installation position of the spacer elements included in the spacer assembly are the same as in Embodiment 1.

[0106] It is worth noting that, compared with Embodiment 1 above, the optical lens of Embodiment 2 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 2 is the same as Table 1, and the aspherical coefficient table is the same as Tables 2-1 and 2-2. However, the optical lens of Embodiment 2 has different structural parameters than the optical lens of Embodiment 1 above. That is, the difference between Embodiment 2 and Embodiment 1 above lies in the different dimensional values ​​of some structural parameters in the optical lens. Specifically, the values ​​of various relevant structural parameters in Embodiment 2 and Embodiment 1 above are shown in Table 8 below.

[0107] Example 3

[0108] like Figure 4 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel. The number and arrangement of the lenses in the lens group are the same as in Embodiment 1, and the number and installation position of the spacer elements included in the spacer assembly are the same as in Embodiment 1.

[0109] It is worth noting that, compared with Embodiment 1 above, the optical lens of Embodiment 3 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Tables 2-1 and 2-2. However, the optical lens of Embodiment 3 has different structural parameters than the optical lens of Embodiment 1 above, that is, the difference between Embodiment 3 and Embodiment 1 is that the dimensional values ​​of some structural parameters in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 3 are shown in Table 8 below.

[0110] The magnification chromatic aberration curves of the optical lenses in Examples 1, 2, and 3 are as follows: Figure 5A As shown, it represents the deviation of light at different image heights on the imaging plane after passing through the optical lens; the astigmatism curves of the optical lenses in Embodiments 1, 2, and 3 are shown below. Figure 5B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical lenses in Embodiments 1, 2, and 3 are as follows. Figure 5C As shown, it represents the distortion magnitude values ​​corresponding to different image heights. According to... Figure 5A , Figure 5B and Figure 5C It can be seen that the optical lenses in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0111] Example 4

[0112] like Figure 6 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel. The lens group includes, arranged sequentially from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0113] The spacing assembly includes a first spacing element P1 located between the first lens E1 and the second lens E2 and in contact with the image-side surface S2 of the first lens E1; a second spacing element P2 located between the second lens E2 and the third lens E3 and in contact with the image-side surface S4 of the second lens E2; a third spacing element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image-side surface S6 of the third lens E3; a fourth spacing element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface S8 of the fourth lens E4; a fifth spacing element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface S10 of the fifth lens E5; a sixth spacing element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image-side surface S12 of the sixth lens E6; a sixth auxiliary spacing element P6b located between the sixth spacing element P6 and the seventh lens E7 and in contact with the image-side surface of the sixth spacing element P6; and a seventh spacing element P7 located between the seventh lens E7 and the eighth lens E8 and in contact with the image-side surface S14 of the seventh lens E7.

[0114] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave; the second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave; the third lens E3 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is concave; the fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave; the fifth lens E5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave; the sixth lens E6 has positive optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex; the seventh lens E7 has negative optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex; and the eighth lens E8 has negative optical power, its object-side surface S15 is concave, and its image-side surface S16 is concave.

[0115] In addition, Table 3 shows the basic optical parameters of the optical lens of Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0116] Table 3: Basic optical parameters of the optical lens in Example 4

[0117]

[0118] In this embodiment, any one of the lens surfaces from the object-side surface S1 of the first lens E1 to the image-side surface S16 of the eighth lens E8 is an aspherical surface, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Tables 4-1 and 4-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical lens S1 to S16 in Embodiment 4.

[0119] Table 4-1: Aspherical coefficient table of the optical lens in Example 4

[0120]

[0121] Table 4-2: Aspherical coefficient table of the optical lens in Example 4

[0122]

[0123] Example 5

[0124] like Figure 7 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel. The number and arrangement of the lenses in the lens group are the same as in Embodiment 4, and the number and installation position of the spacer elements included in the spacer assembly are the same as in Embodiment 1.

[0125] It is worth noting that, compared with Embodiment 4 above, the optical lens of Embodiment 5 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 5 is the same as Table 3, and the aspherical coefficient table is the same as Tables 4-1 and 4-2. However, the optical lens of Embodiment 5 has different structural parameters than the optical lens of Embodiment 4 above, that is, the difference between Embodiment 5 and Embodiment 4 is that the dimensional values ​​of some structural parameters in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 5 and Embodiment 4 are shown in Table 8 below.

[0126] Example 6

[0127] like Figure 8 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel. The number and arrangement of the lenses in the lens group are the same as in Embodiment 4, and the number and installation position of the spacer elements included in the spacer assembly are the same as in Embodiment 1.

[0128] It is worth noting that, compared with Embodiment 4 above, the optical lens of Embodiment 6 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 6 is the same as Table 3, and the aspherical coefficient table is the same as Tables 4-1 and 4-2. However, the optical lens of Embodiment 6 has different structural parameters than the optical lens of Embodiment 4 above, that is, the difference between Embodiment 6 and Embodiment 4 above lies in the different dimensional values ​​of some structural parameters in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 6 are shown in Table 8 below.

[0129] The magnification chromatic aberration curves of the optical lenses in Examples 4, 5, and 6 are as follows: Figure 9A As shown, it represents the deviation of light at different image heights on the imaging plane after passing through the optical lens; the astigmatism curves of the optical lenses in Embodiments 4, 5, and 6 are shown below. Figure 9B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical lenses in Examples 4, 5, and 6 are as follows. Figure 9C As shown, it represents the distortion magnitude values ​​corresponding to different image heights. According to... Figure 9A , Figure 9B and Figure 9C It can be seen that the optical lenses in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0130] Example 7

[0131] like Figure 10 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel. The lens group includes, arranged sequentially from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0132] The spacing assembly includes a first spacing element P1 located between the first lens E1 and the second lens E2 and in contact with the image-side surface S2 of the first lens E1; a second spacing element P2 located between the second lens E2 and the third lens E3 and in contact with the image-side surface S4 of the second lens E2; a third spacing element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image-side surface S6 of the third lens E3; a fourth spacing element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface S8 of the fourth lens E4; a fifth spacing element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface S10 of the fifth lens E5; a sixth spacing element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image-side surface S12 of the sixth lens E6; and a seventh spacing element P7 located between the seventh lens E7 and the eighth lens E8 and in contact with the image-side surface S14 of the seventh lens E7.

[0133] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave; the third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave; the fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave; the fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave; the sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex; the seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex; and the eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave.

[0134] In addition, Table 5 shows the basic optical parameters of the optical lens of Embodiment 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0135] Table 5: Basic optical parameters of the optical lens in Example 7

[0136]

[0137] In this embodiment, any one of the lens surfaces from the object-side surface S1 of the first lens E1 to the image-side surface S16 of the eighth lens E8 is an aspherical surface, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Tables 6-1 and 6-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical lens S1 to S16 in Embodiment 7.

[0138] Table 6-1: Aspherical coefficient table of the optical lens in Example 7

[0139]

[0140] Table 6-2: Aspherical coefficient table of the optical lens in Example 7

[0141]

[0142] Example 8

[0143] like Figure 11 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel. The number and arrangement of the lenses in the lens group are the same as in Embodiment 7, and the number and installation position of the spacer elements included in the spacer assembly are the same as in Embodiment 1.

[0144] It is worth noting that, compared with Embodiment Seven above, the optical lens of Embodiment Eight has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment Eight is the same as Table 5, and the aspherical coefficient table is the same as Tables 6-1 and 6-2. However, the optical lens of Embodiment Eight has different structural parameters than the optical lens of Embodiment Seven above, that is, the difference between Embodiment Eight and Embodiment Seven is that the dimensional values ​​of some structural parameters in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment Eight and Embodiment Seven are shown in Table 8 below.

[0145] Example 9

[0146] like Figure 12 As shown, in this embodiment, the optical lens includes a lens barrel and a lens group and a spacer assembly housed within the lens barrel. The number and arrangement of the lenses in the lens group are the same as in Embodiment 7, and the number and installation position of the spacer elements included in the spacer assembly are the same as in Embodiment 1.

[0147] It is worth noting that, compared with Embodiment Seven above, the optical lens of Embodiment Nine has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment Nine is the same as Table 5, and the aspherical coefficient table is the same as Tables 6-1 and 6-2. However, the optical lens of Embodiment Nine has different structural parameters than the optical lens of Embodiment Seven above, that is, the difference between Embodiment Nine and Embodiment Seven above lies in the different dimensional values ​​of some structural parameters in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment Nine are shown in Table 8 below.

[0148] The magnification chromatic aberration curves of the optical lenses in Examples 7, 8, and 9 are as follows: Figure 13AAs shown, it represents the deviation of light at different image heights on the imaging plane after passing through the optical lens; the astigmatism curves of the optical lenses in Embodiments 7, 8, and 9 are shown below. Figure 13B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical lenses in Embodiments 7, 8, and 9 are as follows. Figure 13C As shown, it represents the distortion magnitude values ​​corresponding to different image heights. According to... Figure 13A , Figure 13B and Figure 13C It can be seen that the optical lenses in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0149] In summary, the optical parameters of the optical lenses in Examples 1 to 9 are shown in Table 7 below.

[0150] Table 7: System Optical Parameters of Optical Lenses

[0151]

[0152] Furthermore, the structural parameters of the optical lenses in Examples 1 to 9 are shown in Table 8, and the units of the values ​​of each parameter shown in Table 8 are all millimeters (mm).

[0153] Table 8: Structural Parameters of Optical Lenses

[0154]

[0155] In summary, the optical lenses in Examples 1 to 9 satisfy the relationships shown in Table 9, as detailed in Table 9.

[0156] Table 9: Relationships Satisfied by Optical Lenses

[0157]

[0158] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0159] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical lens, characterized in that: Includes a lens barrel and a lens assembly and spacer assembly housed within the lens barrel; The lens group comprises, arranged sequentially from the object side to the image side along the optical axis: a first lens with positive optical power, a second lens with optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with negative optical power; the center thickness of the second lens is the minimum value among the center thicknesses of all the lenses with optical power. The spacing assembly includes a first spacing element located between the first lens and the second lens and in contact with the image side of the first lens, and a second spacing element located between the second lens and the third lens and in contact with the image side of the second lens. The optical lens satisfies the following conditions: 1.20 < L / (D0m-D0s) < 1.65, 9.05 < d2s / T23 ≤ 12.70, and 1.45 < (EP12+CP2) / CT2 ≤ 2.05; Wherein, L is the length of the lens barrel, D0m is the outer diameter of the image-side end face of the lens barrel, D0s is the outer diameter of the object-side end face of the lens barrel, d2s is the inner diameter of the object-side side face of the second spacer element, T23 is the air gap between the second lens and the third lens on the optical axis, EP12 is the distance between the image-side face of the first spacer element and the object-side face of the second spacer element along the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis, and CT2 is the center thickness of the second lens.

2. The optical lens according to claim 1, characterized in that, The spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the optical lens satisfies: 4.00 < f5 / (d4m+d5s) < 7.95; where f5 is the effective focal length of the fifth lens, d4m is the inner diameter of the image-side surface of the fourth spacer element, and d5s is the inner diameter of the object-side surface of the fifth spacer element.

3. The optical lens according to claim 1, characterized in that, The spacer assembly includes a third spacer element located between the third lens and the fourth lens and in contact with the image side of the third lens; the optical lens satisfies: 6.45 < d3s / (CT3 + T34) < 8.40; where d3s is the inner diameter of the object side of the third spacer element, CT3 is the center thickness of the third lens, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

4. The optical lens according to claim 1, characterized in that, The spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: 0.20 < R13 / R14×N7 ≤ 0.95 and 2.00 < EP67 / CT7 < 4.25; where R13 is the object-side radius of curvature of the seventh lens, R14 is the image-side radius of curvature of the seventh lens, N7 is the refractive index of the seventh lens, EP67 is the distance along the optical axis between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element, and CT7 is the center thickness of the seventh lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 3.10 < (d2m + D2m) / R4 ≤ 4.20; where d2m is the inner diameter of the image-side surface of the second spacer element, D2m is the outer diameter of the image-side surface of the second spacer element, and R4 is the radius of curvature of the image-side surface of the second lens.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 9.55≤f1 / EP01<14.10; where f1 is the effective focal length of the first lens, and EP01 is the distance along the optical axis between the object-side end face of the lens barrel and the object-side surface of the first spacer element.

7. The optical lens according to claim 1, characterized in that, The spacer assembly includes a third spacer element located between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical lens satisfies: 0.40 < EP34 / (T45 + CP4) < 1.05; where EP34 is the distance along the optical axis between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and CP4 is the maximum thickness of the fourth spacer element along the optical axis.

8. The optical lens according to claim 1, characterized in that, The spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image side of the sixth lens; the optical lens satisfies: 1.85 < f56 / (D6s-d6s) < 4.95; where f56 is the combined focal length of the fifth lens and the sixth lens, D6s is the outer diameter of the object side of the sixth spacer element, and d6s is the inner diameter of the object side of the sixth spacer element.

9. The optical lens according to claim 1, characterized in that, The spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical lens satisfies: 2.15 < f5 / R9 < 6.85 and 1.45 ≤ R9 / d4m < 6.80; where f5 is the effective focal length of the fifth lens, R9 is the radius of curvature of the object-side surface of the fifth lens, and d4m is the inner diameter of the image-side surface of the fourth spacer element.

10. The optical lens according to claim 1, characterized in that, The spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image side of the fourth lens; the optical lens satisfies: 10.85 < d4s / CT4×N4 < 14.95; where d4s is the inner diameter of the object side of the fourth spacer element, CT4 is the center thickness of the fourth lens, and N4 is the refractive index of the fourth lens.

11. The optical lens according to claim 1, characterized in that, The spacer assembly includes a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image side of the seventh lens; the optical lens satisfies: 0.65 < T67 / (CP7+T78) ≤ 10.25; where T67 is the air gap between the sixth lens and the seventh lens on the optical axis, CP7 is the maximum thickness of the seventh spacer element along the optical axis, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis.

12. The optical lens according to claim 1, characterized in that, The optical lens satisfies: -5.60 < (R4 + R5) / d2s < -3.05; where R4 is the image-side radius of curvature of the second lens, R5 is the object-side radius of curvature of the third lens, and d2s is the object-side inner diameter of the second spacer element.

13. The optical lens according to claim 1, characterized in that, The spacer assembly includes a sixth spacer element located between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: 1.40≤f67 / (CT6+EP67+CT7)<3.10; where f67 is the combined focal length of the sixth lens and the seventh lens, CT6 is the center thickness of the sixth lens, EP67 is the distance along the optical axis between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element, and CT7 is the center thickness of the seventh lens.

14. The optical lens according to claim 1, characterized in that, The spacing assembly includes a seventh spacing element located between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; the optical lens satisfies: -1.85≤f7 / (d7s+d7m)<-0.50; where f7 is the effective focal length of the seventh lens, d7s is the inner diameter of the object-side surface of the seventh spacing element, and d7m is the inner diameter of the image-side surface of the seventh spacing element.

15. The optical lens according to claim 1, characterized in that, The spacer assembly includes a fourth spacer element located between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens; the optical lens satisfies: 10.35 < D5s / (EP45+CP5) ≤ 17.05; where D5s is the outer diameter of the object-side surface of the fifth spacer element, EP45 is the distance between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and CP5 is the maximum thickness of the fifth spacer element along the optical axis.

Images