Optical lens

Abstract

The invention provides an optical lens. The optical lens comprises a lens barrel, and a lens group and a spacing assembly which are accommodated in the lens barrel. The lens group comprises a first lens with focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with positive focal power which are sequentially arranged from the object side to the image side along the optical axis. The sixth lens has positive focal power, the seventh lens has negative focal power, and the eighth lens has focal power, and in the air intervals of any two adjacent lenses in the lens group on the optical axis, the air interval of the sixth lens and the seventh lens on the optical axis is the largest; the spacing assembly comprises first, second, third, fourth, fifth, sixth and seventh spacing elements; the optical lens satisfies the following conditions: 3.60 < d6m / T67 < 7.55; the d5m / (CT6-CT7) is more than 11.85 and less than 13.60.

Description

Technical Field

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

[0002] As the resolution and miniaturization requirements of optical lenses continue to increase in mobile terminals, automotive imaging and other fields, system stray light suppression has become a core challenge in improving image quality. Stray light (such as ghosting and flare) is mainly formed by multiple reflections of non-imaging light within the lens on the optical or mechanical surfaces. Especially in backlight or strong point light source scenarios, it can severely degrade image contrast and produce artifacts.

[0003] Traditional solutions typically rely on improvements to the overall light-shielding structure, such as reducing the air gap between lenses or increasing the inner diameter of the spacer element. However, in complex systems with multiple lenses, simply reducing the air gap can easily lead to a loss of light transmission, while blindly increasing the inner diameter of the spacer element makes it difficult to effectively block stray light from the edges. More importantly, if the inner diameter of the spacer element is out of sync with the air gap and the difference in lens thickness, it can also lead to an imbalance between light transmission efficiency and light-shielding effect, thereby generating stray light or causing scattered light to leak to the image plane. Summary of the Invention

[0004] One advantage of this application is that it provides an optical lens that can precisely coordinate mechanical shading and optical path solutions to ensure unobstructed imaging optical path at the edge of the field of view while intercepting stray light from the transition zone of the high curvature lens at the structural source.

[0005] This application provides an optical lens, including a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens with optical power, a second lens with positive 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 optical power. The object side of the first lens is convex and the image side is concave; the object side of the second lens is convex; the object side of the third lens is convex and the image side is concave; the object side of the fourth lens is concave and the image side is convex; the object side of the fifth lens is convex and the image side is concave; the image side of the sixth lens is convex; the object side and the image side of the seventh lens are both concave; and the image side of the eighth lens is concave. The side surface is convex. Among any two adjacent lenses in the lens group, the air gap between the sixth lens and the seventh lens on the optical axis is the largest. The spacing assembly includes a first spacing element positioned on the image side of the first lens and at least partially in contact with the first lens; a second spacing element positioned on the image side of the second lens and at least partially in contact with the second lens; a third spacing element positioned on the image side of the third lens and at least partially in contact with the third lens; a fourth spacing element positioned on the image side of the fourth lens and at least partially in contact with the fourth lens; a fifth spacing element positioned on the image side of the fifth lens and at least partially in contact with the fifth lens; a sixth spacing element positioned on the image side of the sixth lens and at least partially in contact with the sixth lens; and a seventh spacing element positioned on the image side of the seventh lens and at least partially in contact with the seventh lens. The optical lens satisfies the following: 3.60<d6m / T67<7.55; 11.85<d5m / (CT6-CT7)<13.60; Wherein, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, CT6 is the center thickness of the sixth lens, CT7 is the center thickness of the seventh lens, d5m is the inner diameter of the image side of the fifth spacer element, and d6m is the inner diameter of the image side of the sixth spacer element.

[0006] In some embodiments of this application, the optical lens satisfies: 4.75 < f6 / (CT6+CP6) < 7.90; Wherein, CT6 is the center thickness of the sixth lens, f6 is the effective focal length of the sixth lens, and CP6 is the maximum thickness of the sixth spacer element along the optical axis.

[0007] In some embodiments of this application, the optical lens satisfies: 0.85 < EP67 / (T67-CT7) < 4.80; Wherein, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, CT7 is the center thickness of the seventh lens, and EP67 is the distance from the sixth spacer element to the seventh spacer element along the optical axis.

[0008] In some embodiments of this application, the optical lens satisfies: 2.05 < EPD / (D1s-d1s) < 3.10; Wherein, EPD is the entrance pupil diameter of the optical lens, D1s is the outer diameter of the object side surface of the first spacer element, and d1s is the inner diameter of the object side surface of the first spacer element.

[0009] In some embodiments of this application, the optical lens satisfies: 8.10 < d1s / (CT1+CP1) < 9.75; Wherein, CP1 is the maximum thickness of the first spacer element along the optical axis, CT1 is the center thickness of the first lens, and d1s is the inner diameter of the object side of the first spacer element.

[0010] In some embodiments of this application, the optical lens satisfies: 1.35 < (D5m - d5m) / T56 < 6.70; Wherein, d5m is the inner diameter of the image-side surface of the fifth spacer element, D5m is the outer diameter of the image-side surface of the fifth spacer element, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0011] In some embodiments of this application, the optical lens satisfies: 1.45 < f2 / d2s < 3.00; 0.80 < D1m / R3 < 1.75; Wherein, d2s is the inner diameter of the object side of the second spacer element, D1m is the outer diameter of the image side of the first spacer element, f2 is the effective focal length of the second lens, and R3 is the radius of curvature of the object side of the second lens.

[0012] In some embodiments of this application, the optical lens satisfies: 0.85 ≤ EP45 / CT5 < 2.45; Wherein, EP45 is the distance from the fourth spacer element to the fifth spacer element along the optical axis, and CT5 is the center thickness of the fifth lens.

[0013] In some embodiments of this application, the optical lens satisfies: -4.95 < f3 / d3s < -1.90; 4.90 ≤ d3s / (CT3+T34) < 6.15; Wherein, f3 is the effective focal length of the third lens, CT3 is the center thickness of the third lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, and d3s is the inner diameter of the object side of the third spacer element.

[0014] In some embodiments of this application, the optical lens satisfies: -2.75 < SAG71 / (CP6+CT7) < -1.35; Wherein, SAG71 is the axial distance between the intersection of the side surface of the seventh lens and the optical axis and the vertex of the effective radius of the side surface of the seventh lens, CP6 is the maximum thickness of the sixth spacer element along the optical axis, and CT7 is the center thickness of the seventh lens.

[0015] In some embodiments of this application, the optical lens satisfies: 6.25 < f6 / (CP5+EP56+CP6) ≤ 10.50; Wherein, f6 is the effective focal length of the sixth lens, EP56 is the distance from the fifth spacer to the sixth spacer along the optical axis, CP5 is the maximum thickness of the fifth spacer along the optical axis, and CP6 is the maximum thickness of the sixth spacer along the optical axis.

[0016] In some embodiments of this application, the optical lens satisfies: -4.40 < f7 / (CT7+EP67) < -2.55; Wherein, EP67 is the distance from the sixth spacer element to the seventh spacer element along the optical axis, CT7 is the center thickness of the seventh lens, and f7 is the effective focal length of the seventh lens.

[0017] In some embodiments of this application, the optical lens satisfies: 6.45 < d7s / (CT7+CT8) ≤ 8.40; Wherein, d7s is the inner diameter of the object side of the seventh spacer element, CT7 is the center thickness of the seventh lens, and CT8 is the center thickness of the eighth lens.

[0018] In some embodiments of this application, the optical lens satisfies: 1.45 < T67 / T78 < 3.65; 1.05 < d7s / d6s < 1.55; Wherein, T78 is the air gap between the seventh lens and the eighth lens on the optical axis, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, d6s is the inner diameter of the object side of the sixth spacer element, and d7s is the inner diameter of the object side of the seventh spacer element.

[0019] In some embodiments of this application, the spacing assembly further includes an eighth spacing element, which is positioned on the image side of the eighth lens and at least partially in contact with the eighth lens.

[0020] In some embodiments of this application, the spacing assembly further includes a fourth auxiliary spacing element and a fourth secondary auxiliary spacing element, wherein the fourth auxiliary spacing element is disposed on the image side of the fourth spacing element and is at least partially in contact with the fourth spacing element, and the fourth secondary auxiliary spacing element is disposed on the image side of the fourth auxiliary spacing element and is at least partially in contact with the fourth auxiliary spacing element.

[0021] In summary, the optical lens of this application, when satisfying the condition that the air gap between the sixth and seventh lenses on the optical axis is the largest in the entire lens group, the excessive air gap between them increases the risk of light entering the structural area of ​​the seventh lens after refraction, easily producing stray light and ghosting. To address this, by balancing the ratio of the image-side inner diameter d6m of the sixth spacer element to the air gap T67 between the sixth and seventh lenses on the optical axis, the smooth passage of light in this area can be ensured, while the structure of the sixth spacer element effectively blocks non-imaging light. In addition, by constraining the image-side inner diameter d5m of the fifth spacer element to the difference in center thickness (CT6 - CT7) between the sixth and seventh lenses, it is ensured that the fifth spacer element can both effectively block stray light and avoid introducing new reflective surfaces due to excessive structural design, thereby effectively suppressing reflected stray light. Attached Figure Description

[0022] Figure 1A This is a schematic diagram of the structural parameters of an optical lens according to one embodiment of this application; Figure 1B yes Figure 1A A schematic diagram of another part of the parameters; Figure 2 This is a schematic diagram of the structure of an optical lens according to Embodiment 1 of this application; Figure 3 This is a schematic diagram of the structure of an optical lens according to Embodiment 2 of this application; Figure 4 This is a schematic diagram of the structure of an optical lens according to Embodiment 3 of this application; Figure 5A A schematic diagram of the on-axis chromatic aberration curves of the optical lenses according to the above-described Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown; 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. Figure 5CA 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. Figure 6 This is a schematic diagram of the structure of an optical lens according to Embodiment 4 of this application; Figure 7 This is a schematic diagram of the structure of an optical lens according to Embodiment 5 of this application; Figure 8 This is a schematic diagram of the structure of an optical lens according to Embodiment Six of this application; Figure 9A A schematic diagram of the on-axis chromatic aberration curves of the optical lenses according to Embodiments 4, 5 and 6 of this application is shown. 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. Figure 9C 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. Figure 10 This is a schematic diagram of the structure of an optical lens according to Embodiment Seven of this application; Figure 11 This is a schematic diagram of the structure of an optical lens according to Embodiment 8 of this application; Figure 12 This is a schematic diagram of the structure of an optical lens according to Embodiment Nine of this application; Figure 13A A schematic diagram of the on-axis chromatic aberration curves of the optical lenses of Embodiments 7, 8, and 9 according to this application is shown. 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. Figure 13C 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. Figure 14A A schematic diagram of the light spot of the optical lens is shown when d6m / T67=3.702 and d5m / (CT6-CT7)=12.4. Figure 14B A schematic diagram of the light spot of the optical lens is shown when d6m / T67=3.265 and d5m / (CT6-CT7)=9.975; Figure 14C A schematic diagram of the light spot of the optical lens is shown when d6m / T67=7.85 and d5m / (CT6-CT7)=14.25; Figure 15A The optical path diagram is shown when the optical lens satisfies d6m / T67=3.702 and d5m / (CT6-CT7)=12.4; Figure 15B The optical path diagram is shown when the optical lens satisfies d6m / T67=3.265 and d5m / (CT6-CT7)=9.975; Figure 15C The optical path diagram is shown when the optical lens satisfies d6m / T67=7.85 and d5m / (CT6-CT7)=14.25. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] This application provides an optical lens, including a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens with optical power, a second lens with positive 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 optical power; the object side of the first lens is convex and the image side is concave; the object side of the second lens is convex; the object side of the third lens is convex and the image side is concave; the object side of the fourth lens is concave and the image side is convex; the object side of the fifth lens is convex and the image side is concave; the image side of the sixth lens is convex; the object side and the image side of the seventh lens are both concave; and the image side of the eighth lens is convex. Among any two adjacent lenses in the lens group, the air gap between the sixth and seventh lenses along the optical axis is the largest. The spacer assembly includes a lens placed in a... The optical lens comprises: a first spacer element that is at least partially in contact with the first lens on the image side; a second spacer element that is at least partially in contact with the second lens on the image side; a third spacer element that is at least partially in contact with the third lens on the image side; a fourth spacer element that is at least partially in contact with the fourth lens on the image side; a fifth spacer element that is at least partially in contact with the fifth lens on the image side; a sixth spacer element that is at least partially in contact with the sixth lens on the image side; and a seventh spacer element that is at least partially in contact with the seventh lens on the image side; the optical lens satisfies: 3.60 < d6m / T67 < 7.55; 11.85 < d5m / (CT6-CT7) < 13.60; where T67 is the air gap between the sixth and seventh lenses on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, CT7 is the center thickness of the seventh lens on the optical axis, d5m is the image-side inner diameter of the fifth spacer element, and d6m is the image-side inner diameter of the sixth spacer element.

[0031] It is worth noting that, in the optical lens of this application, when the air gap between the sixth and seventh lenses on the optical axis is the largest in the entire lens group, the excessively large air gap between them increases the risk of light entering the structural area of ​​the seventh lens after refraction, which can easily produce stray light and ghosting. To address this, by balancing the ratio of the image-side inner diameter d6m of the sixth spacer element to the air gap T67 between the sixth and seventh lenses on the optical axis, the smooth passage of light in this area can be ensured, while the structure of the sixth spacer element can effectively block non-imaging light. In addition, by constraining the image-side inner diameter d5m of the fifth spacer element to the difference in center thickness (CT6 - CT7) between the sixth and seventh lenses on the optical axis, it is ensured that the fifth spacer element can both block stray light and avoid introducing new reflective surfaces due to excessive structural design, thereby effectively suppressing reflected stray light.

[0032] Specifically, by constraining the ratio of d6m to T67, while ensuring that light rays pass smoothly through the edge field of view and avoiding strong reflection stray light caused by occlusion, it can also efficiently intercept non-imaging stray light from the large air gap area, significantly reducing the risk of it entering the subsequent optical path and imaging surface, effectively suppressing ghosting and glare, and achieving the effect of optimizing edge stray light control. By constraining the ratio of d5m to (CT6-CT7), the fifth spacer element can effectively constrain the light rays in the edge region of the sixth lens, preventing light reflection at the lens notch or local stray light caused by lens edge exposure. At the same time, it can ensure that its structural design is reasonable, and that the fifth spacer element will not be unable to effectively constrain the light rays at the lens edge due to excessive protrusion (too small inner diameter) or insufficient convergence (too large inner diameter), which would cause excessive light reflection and local stray light or interference with the lens structure. Thus, stray light caused by edge light and structural reflection is effectively suppressed near the fifth and sixth lenses. In other words, through the collaborative design of the two relationships mentioned above, the contradiction between ensuring light transmission efficiency and optimizing stray light blocking is resolved. This significantly reduces the generation of stray light (such as fan-shaped stray light) in the entire lens system under backlight and strong point light source scenes, effectively avoiding image contrast degradation and artifact problems, thereby achieving clear and high-contrast imaging effects.

[0033] For example, Figure 14A and Figure 15A The diagrams show the light spot and optical path of the optical lens when the following conditions are met: d6m / T67=3.702; d5m / (CT6-CT7)=12.4. Figure 14B and Figure 15B The diagrams show the light spot and optical path of the optical lens when the following conditions are met: d6m / T67=3.265; d5m / (CT6-CT7)=9.975. Figure 14C and Figure 15C The diagrams show the light spot and optical path of the optical lens when the following conditions are met: d6m / T67=7.85; d5m / (CT6-CT7)=14.25.

[0034] As can be easily seen from the diagram: Figure 14A and Figure 15A As shown, when the relation d6m / T67 is greater than 3.60 and less than 7.58, and the relation d5m / (CT6-CT7) is greater than 11.85 and less than 13.62, no stray light is generated; Figure 14B and Figure 15B As shown, when the relation d6m / T67 is less than 3.60 and the relation d5m / (CT6-CT7) is less than 11.85, the comparison... Figure 14AFan-shaped stray light exists in some areas of the image surface, combined with Figure 15B The main cause is that the fifth spacer element is too long, which cannot effectively confine the light rays at the lens edge, causing light reflection and resulting in local stray light; such as Figure 14C and Figure 15C As shown, when the relation d6m / T67 is greater than 7.58 and the relation d5m / (CT6-CT7) is greater than 13.62, the comparison... Figure 14A Fan-shaped stray light exists in some areas of the image surface, combined with Figure 15C The main cause is that the fifth spacer element is too short, which loses its constraint on the edge light, resulting in non-imaging light leakage and increased stray light on the image plane.

[0035] According to some embodiments of this application, the optical lens satisfies: 4.75 < f6 / (CT6+CP6) < 7.90; where CT6 is the center thickness of the sixth lens on the optical axis, f6 is the effective focal length of the sixth lens, and CP6 is the thickness of the sixth spacer element.

[0036] In this way, by controlling the ratio of f6 to (CT6+CP6), an optimal balance can be achieved between suppressing aberrations and ensuring structural strength. This allows for the coordinated optimization of lens power distribution, optical path orientation, and physical support, thereby improving the overall optical performance and durability of the lens. Specifically, by reasonably constraining the lower limit of this ratio, aberrations such as spherical aberration and field curvature caused by excessive thickening or excessively short focal length of the sixth lens can be effectively avoided, significantly improving image resolution and image flatness. Conversely, by strictly limiting the upper limit of this ratio, mechanical strength weakening caused by excessive thinning or excessively long focal length of the sixth lens can be prevented, significantly reducing the interference of assembly errors and environmental vibrations on the optical path, and ensuring system reliability and long-term stability.

[0037] According to some embodiments of this application, the optical lens satisfies: 0.85 < EP67 / (T67 - CT7) < 4.80; where T67 is the air gap between the sixth and seventh lenses on the optical axis, CT7 is the center thickness of the seventh lens, and EP67 is the on-axis distance between the sixth and seventh spacers.

[0038] In this way, by coordinating and adjusting the difference ratio between EP67 and (T67-CT7), the optimal match between the lens spacing and the length of the spacer element can be achieved within a limited volume, taking into account both optical shading requirements and mechanical reliability, and ensuring long-term stable operation of the system. Specifically, by limiting the lower limit of the ratio, the weak support caused by insufficient axial length of the spacer element or excessive compression of the air space can be avoided, significantly reducing the risk of lens group wobbling and optical eccentricity, and improving the system's shock resistance and assembly consistency. By constraining the upper limit of the ratio, mechanical collisions caused by excessively long spacer elements occupying space or excessively small air gaps can be prevented, and stray light reflections caused by structural redundancy can be eliminated simultaneously, ensuring optical path purity and component compatibility.

[0039] According to some embodiments of this application, the optical lens satisfies: 2.05 < EPD / (D1s-d1s) < 3.10; where EPD is the entrance pupil diameter of the optical lens, D1s is the outer diameter of the object side of the first spacer element, and d1s is the inner diameter of the object side of the first spacer element.

[0040] In this way, by constraining the ratio of EPD to (D1s - d1s), the size of the entrance pupil aperture and the mechanical strength of the spacer element can be balanced, establishing a suitable relationship between suppressing glare interference and ensuring image brightness, significantly improving image uniformity and detail resolution in backlit scenes. Specifically, by strictly limiting the lower limit of this ratio, the cutting effect of the circumferential wall thickness redundancy of the spacer element on the light beam can be effectively avoided, ensuring smooth incident light from the edge field of view, eliminating vignetting and maintaining the consistency of system light transmission. By reasonably constraining the upper limit of this ratio, the deformation risk that may be caused by the weakening of the circumferential wall thickness can be prevented, the structural rigidity of the spacer element can be strengthened, and stray light can be blocked from penetrating from its edge to the image plane.

[0041] According to some embodiments of this application, the optical lens satisfies: 8.10 < d1s / (CT1+CP1) < 9.75; where CP1 is the maximum thickness of the first spacer element along the optical axis, CT1 is the center thickness of the first lens, and d1s is the inner diameter of the object side of the first spacer element.

[0042] In this way, by constraining the ratio of d1s to (CT1+CP1), the light-transmitting aperture and structural stability can be optimized. Specifically, by limiting the lower limit of this ratio, the light-transmitting path can be prevented from being squeezed due to excessive axial space occupation, effectively suppressing edge light shading, eliminating vignetting, and ensuring the total light transmission. By limiting the upper limit of this ratio, the wall thickness of the spacer element can be avoided from being too thin or the support area reduced due to insufficient axial structural height, thereby ensuring the positioning stability and deformation resistance of the lens group and eliminating optical performance fluctuations caused by unstable support.

[0043] According to some embodiments of this application, the optical lens satisfies: 1.35 < (D5m - d5m) / T56 < 6.70; where d5m is the inner diameter of the image-side surface of the fifth spacer element, D5m is the outer diameter of the image-side surface of the fifth spacer element, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0044] In this way, by constraining the ratio of (D5m-d5m) to T56, it is possible to optimize light transmission efficiency and system compactness while enhancing structural reliability and stray light interception efficiency. Specifically, by limiting the lower limit of this ratio, on the one hand, it can avoid the decrease in strength of the spacer element due to insufficient wall thickness, effectively preventing structural deformation under assembly eccentricity or environmental stress. On the other hand, sufficient wall thickness can simultaneously intercept stray light intruding from the side, eliminating non-imaging light leakage caused by mechanical gaps. On the other hand, by limiting the upper limit of this ratio, on the one hand, it can prevent the wall thickness from excessively encroaching on the light transmission space, ensuring that effective light (including edge field of view light) passes through without obstruction. On the other hand, it can also avoid air gap compression or axial expansion of the system due to wall thickness redundancy, balancing optical performance and structural simplification requirements within the space.

[0045] According to some embodiments of this application, the optical lens satisfies: 1.45 < f2 / d2s < 3.00; 0.80 < D1m / R3 < 1.75; where d2s is the inner diameter of the object side of the second spacer element, D1m is the outer diameter of the image side of the first spacer element, f2 is the effective focal length of the second lens, and R3 is the radius of curvature of the object side of the second lens.

[0046] In this way, by coordinating the constraints of f2 and d2s, as well as the ratio of D1m to R3, high-precision aberration suppression can be achieved while enhancing optomechanical coupling stability. Specifically, by precisely adjusting the ratio of the focal length to the aperture of the second lens (f2 / d2s), the refraction angle of incident light at the edge can be effectively balanced, suppressing coma and astigmatism at the periphery of the field of view and improving overall image resolution. Furthermore, by controlling the outer diameter of the first spacer element support and the curvature of the object side surface of the second lens (D1m / R3), on the one hand, it can ensure that the curvature of the mechanical structure fits the optical surface of the lens, eliminating optical axis offset and surface stress deformation caused by assembly displacement. On the other hand, it can also adaptively adapt the curvature design and avoid field curvature distortion caused by mechanical interference, ensuring the long-term stability of aberration correction performance.

[0047] According to some embodiments of this application, the optical lens satisfies: 0.85≤EP45 / CT5<2.45; where EP45 is the on-axis distance from the fourth spacer element to the fifth spacer element, and CT5 is the center thickness of the fifth lens.

[0048] In this way, by constraining the ratio range of EP45 to CT5, the optical stability and structural rigidity of the optical lens can be enhanced. Specifically, by limiting the lower limit of this ratio, sufficient axial buffer isolation space can be constructed to avoid the mechanical support rigidity reduction caused by excessively dense spacing of the spacer elements, effectively resisting the risk of axial displacement of the lens group caused by vibration, shock or thermal expansion and contraction, thereby achieving the effect of anti-compression deformation protection. By limiting the upper limit of this ratio, the structural loosening of the optical path section between the fourth and fifth lenses due to axial span redundancy or thin lens thickness can be prevented, significantly improving the overall deformation resistance and immunity to external interference of the lens module, thereby achieving the effect of suppressing the tendency of structural instability.

[0049] According to some embodiments of this application, the optical lens satisfies: -4.95 < f3 / d3s < -1.90; 4.90 ≤ d3s / (CT3+T34) < 6.15; where f3 is the effective focal length of the third lens, CT3 is the center thickness of the third lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, and d3s is the inner diameter of the object side of the third spacer element.

[0050] In this way, by constraining the ratio of f3 to d3s and the ratio of d3s to (CT3+T34), the lens geometric parameters and mechanical inner diameter tolerances are constrained in a dual-conditional manner, eliminating the risk of assembly stress or thermal drift caused by thickness or spacing imbalance, and ensuring imaging stability in strong light source scenarios. Specifically, the combination range of the center thickness of the third lens (CT3) and the air gap (T34) between the third and fourth lenses is balanced to avoid material redundancy and structural looseness, compress the overall length of the lens and reduce weight, and meet the compact design requirements of mobile terminals and vehicle imaging. By limiting the ratio of the inner diameter of the object side of the third spacer element (d3s) to (CT3+T34), the utilization rate of the light-transmitting aperture is maximized while ensuring that the third spacer element effectively avoids optical path interference, eliminating stray light blocking blind spots, and suppressing edge reflections of mechanical parts to maintain a high imaging signal-to-noise ratio.

[0051] According to some embodiments of this application, the optical lens satisfies: -2.75 < SAG71 / (CP6+CT7) < -1.35; where SAG71 is the on-axis distance between the intersection of the side surface of the seventh lens and the optical axis and the vertex of the effective radius of the side surface of the seventh lens, CP6 is the maximum thickness of the sixth spacer element along the optical axis, and CT7 is the center thickness of the seventh lens.

[0052] In this way, by controlling the ratio of SAG71 to (CP6+CT7), while ensuring the optical refractive power requirements, the problem of excessively thin lens edges or insufficient mechanical strength caused by excessively steep concave surfaces is avoided, significantly improving the structural reliability of the seventh lens. Among them, the synergistic constraint of CP6 and CT7 can ensure that the end face of the spacer element and the transition area of ​​the lens edge form an axial safe distance, completely eliminating the risk of physical interference between the lens edge and the spacer element caused by excessive compression or assembly stress. In addition, the lower limit of CT7 is implicitly controlled by proportion to meet the minimum thickness requirements of the injection molding process, avoiding insufficient filling or stress cracking in thin-walled areas, and ensuring mass production yield and optical surface accuracy.

[0053] According to some embodiments of this application, the optical lens satisfies: 6.25 < f6 / (CP5+EP56+CP6) ≤ 10.50; where f6 is the effective focal length of the sixth lens, EP56 is the on-axis distance between the fifth spacer element and the sixth spacer element, CP5 is the maximum thickness of the fifth spacer element along the optical axis, and CP6 is the maximum thickness of the sixth spacer element along the optical axis.

[0054] In this way, by limiting the ratio between f6 and (CP5+EP56+CP6), the effect of dynamic aberration compensation can be achieved. Specifically, when the ratio approaches the lower limit, the focal length of the sixth lens is shorter (the optical power is stronger), and the strong optical power characteristic of the sixth lens is activated to compensate for the residual spherical aberration and field curvature of the front lens, thereby improving the overall imaging resolution. When the ratio approaches the upper limit, the focal length of the sixth lens is longer (the optical power is weaker), and the weak optical power design of the sixth lens effectively controls the total focal length and image plane flatness of the system, suppressing defocus at the edge of the field of view.

[0055] According to some embodiments of this application, the optical lens satisfies: -4.40 < f7 / (CT7+EP67) < -2.55; where EP67 is the on-axis distance from the sixth spacer element to the seventh spacer element, CT7 is the center thickness of the seventh lens, and f7 is the effective focal length of the seventh lens.

[0056] In this way, by constraining the ratio between f7 and (CT7+EP67), the negative optical power of the seventh lens can be ensured to be moderate. Specifically, when the ratio approaches the upper limit, the negative optical power is stronger, and the seventh lens achieves aberration fine-tuning with weak negative optical power characteristics, suppressing edge chromatic aberration and distortion; while when the ratio approaches the lower limit, the negative optical power is weaker, and strong negative optical power can significantly correct off-axis aberrations and expand the effective field of view, achieving a synergistic improvement in wide angle and high resolution.

[0057] According to some embodiments of this application, the optical lens satisfies: 6.45 < d7s / (CT7+CT8) ≤ 8.40; where d7s is the inner diameter of the object side of the seventh spacer element, CT7 is the center thickness of the seventh lens, and CT8 is the center thickness of the eighth lens.

[0058] In this way, by constraining the ratio of d7s to (CT7+CT8), the lens thickness parameters can be matched while balancing the function of the spacer element. This maintains the mechanical stability of the air gap between adjacent lenses and enables a miniaturized system design, avoiding the negative impact of excessive size design on the optomechanical structure. Specifically, the lower limit of this ratio can effectively control the inner diameter of the spacer element, avoiding the risk of stress concentration or eccentricity in lens assembly caused by an excessively narrow inner diameter, and significantly reducing tolerance sensitivity. The upper limit of this ratio can prevent the increase in the total system length or lens positioning misalignment caused by an excessively wide inner diameter, ensuring the reliability of mass production.

[0059] According to some embodiments of this application, the optical lens satisfies: 1.45 < T67 / T78 < 3.65; 1.05 < d7s / d6s < 1.55; where T78 is the air gap between the seventh and eighth lenses on the optical axis, T67 is the air gap between the sixth and seventh lenses on the optical axis, d6s is the inner diameter of the object side of the sixth spacer element, and d7s is the inner diameter of the object side of the seventh spacer element.

[0060] In this way, by synergistically constraining the ratio of T67 to T78 and the ratio of d7s to d6s, the aberration correction capability of the seventh lens can be controlled, and the smooth transition of light in key areas can be ensured. Among them, constraining the ratio of T67 to T78 can ensure that it can independently and efficiently correct field curvature and distortion (avoiding insufficient correction capability due to too small an interval), and suppress spherical aberration and coma caused by the deflection of transition light (avoiding uncontrolled light turning angle due to too large an interval), significantly improving the imaging resolution of the system. On the other hand, constraining the ratio of d7s to d6s can precisely constrain the incident diameter of light on the object side of the seventh lens, eliminate optical path distortion and stray light reflection caused by abrupt changes in the interval structure, and synergistically enhance the optical performance stability of the lens group.

[0061] According to some embodiments of this application, the spacing assembly further includes an eighth spacing element, which is disposed on the image side of the eighth lens and at least partially in contact with the eighth lens.

[0062] In this way, by adding an eighth spacer element that is at least partially in contact with the image side of the eighth lens, an independent axial positioning support can be provided for the eighth lens, effectively suppressing the risk of lens displacement caused by assembly stress or external vibration, ensuring that the optical axis alignment accuracy remains reliable throughout long-term use, thereby enhancing the structural stability of the end lens group; in addition, the mechanical constraint of the end spacer element can eliminate image plane drift or image quality fluctuation caused by lens loosening, especially in high-frequency jitter of mobile terminals or vehicle impact environments, enhancing the full life cycle reliability of the optical system, thereby improving the system's anti-interference capability.

[0063] According to some embodiments of this application, the spacing assembly further includes a fourth auxiliary spacing element and a fourth secondary auxiliary spacing element, wherein the fourth auxiliary spacing element is disposed on the image side of the fourth spacing element and is at least partially in contact with the fourth spacing element, and the fourth secondary auxiliary spacing element is disposed on the image side of the fourth auxiliary spacing element and is at least partially in contact with the fourth auxiliary spacing element.

[0064] In this way, by adding auxiliary spacers that are superimposed on the image side of the fourth spacer element, and secondary auxiliary spacers that are superimposed on the image side of the auxiliary spacers element, a hierarchical stress transmission path can be formed. On the one hand, the multi-level spacer structure can significantly suppress lens eccentricity or optical axis tilt caused by single-point stress concentration by dispersing transverse stress waves (such as mechanical drop impact or wide-temperature expansion and contraction), ensuring imaging stability under harsh working conditions, thereby enhancing the shock resistance and thermal stability of the optical lens. On the other hand, relying on the stress redistribution mechanism of the hierarchical contact interface, the creep relaxation or aging micro-deformation of the spacers under long-term high load (such as vehicle vibration or continuous stress in industrial environment) can be effectively delayed, maintaining the assembly accuracy of the lens group, enhancing the shock resistance and thermal stability of the optical lens, thereby extending the reliable life cycle of the optical lens.

[0065] 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, as needed, the optical imaging lens may also include other numbers of spacers than those described in the above embodiments.

[0066] The following describes in more detail some specific, non-limiting embodiments of the above-described embodiments of this application with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical lens, STO represents the surface of the aperture stop, 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, S9 represents the object-side plane of the fifth lens E5, S10 represents the image-side plane of the fifth lens E5, S11 represents the object-side plane of the sixth lens E6, S12 represents the image-side plane of the sixth lens E6, S13 represents the object-side plane of the seventh lens E7, S14 represents the image-side plane of the seventh lens E7, S15 represents the object-side plane of the eighth lens E8, and S16 represents the image-side plane of the eighth lens E8. Furthermore, let Aj denote the j-th order aspherical coefficient, j=4, 6, 8, 10, 12, 14, 16, 18, 20.

[0067] Example 1 like Figure 2 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacer element P2 located on the image side of the third lens E3 and in contact with the image side surface S4 of the third lens E3. The third spacer element P3 is in contact with the image side surface S6 of the lens E3; the fourth spacer element P4 is located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4; the fifth spacer element P5 is located on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5; the sixth spacer element P6 is located on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6; the seventh spacer element P7 is located on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side surface S16 of the eighth lens E8.

[0068] In this embodiment, the first lens E1 has negative optical power, and its object-side surface S1 and image-side surface S2 are convex and concave, respectively; the second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are convex and concave, respectively; the third lens E3 has negative optical power, and its object-side surface S5 and image-side surface S6 are convex and concave, respectively; the fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are concave, respectively. The fifth lens E5 has positive optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex and concave, respectively; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are concave and convex, respectively; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are both concave; the eighth lens E8 has positive optical power, and the object-side surface S15 and the image-side surface S16 of the eighth lens E8 are both convex.

[0069] In addition, Table 1 shows the basic optical parameters of the optical imaging lens of Embodiment 1, where the units for radius of curvature and thickness are millimeters (mm).

[0070] Table 1: Basic optical parameters of the optical lens in Example 1 In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula: ; Where x is 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. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1 to S16 in Example 1.

[0071] Table 2: Aspherical coefficients of the optical lens in Example 1 Example 2 like Figure 3 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacer element P2 located on the image side of the third lens E3 and in contact with the image side surface S4 of the third lens E3. The third spacer element P3 is in contact with the image side surface S6 of the lens E3; the fourth spacer element P4 is located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4; the fifth spacer element P5 is located on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5; the sixth spacer element P6 is located on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6; the seventh spacer element P7 is located on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side surface S16 of the eighth lens E8.

[0072] In this embodiment, the spacing assembly further includes a fourth auxiliary spacing element P4b disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth spacing element P4; a seventh auxiliary spacing element P7b disposed between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh spacing element P7; a fourth secondary auxiliary spacing element P4c disposed on the image side of the fourth auxiliary spacing element P4b and in contact with the image side of the fourth auxiliary spacing element P4b; and a seventh secondary auxiliary spacing element P7c disposed on the image side of the seventh auxiliary spacing element P7b and in contact with the image side of the seventh auxiliary spacing element P7b.

[0073] 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 Table 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 of the lens barrel and the spacer assembly in the optical lens.

[0074] Specifically, the values ​​of the relevant structural parameters in this embodiment and in the above embodiment are shown in Table 8 below, specifically including: the object-side inner diameter d1s of the first spacer element P1; the object-side outer diameter D1s of the first spacer element P1; the image-side outer diameter D1m of the first spacer element P1; the object-side inner diameter d2s of the second spacer element P2; the object-side inner diameter d3s of the third spacer element P3; the image-side inner diameter d5m of the fifth spacer element P5; the image-side outer diameter D5m of the fifth spacer element P5; the object-side inner diameter d6s of the sixth spacer element P6; and the image-side inner diameter d6s of the sixth spacer element P6. The image-side inner diameter d6m of the spacer element P6; the object-side inner diameter d7s of the seventh spacer element P7; the maximum thickness CP1 of the first spacer element P1; the maximum thickness CP5 of the fifth spacer element P5; the maximum thickness CP6 of the sixth spacer element P6; the distance EP45 between the fourth spacer element P4 and the fifth spacer element P5 along the optical axis; the distance EP56 between the fifth spacer element P5 and the sixth spacer element P6 along the optical axis; the distance EP67 between the sixth spacer element P6 and the seventh spacer element P7 along the optical axis. It is understood that the units of the values ​​for each parameter shown in Table 8 are millimeters (mm), and the schematic diagrams of each parameter in the optical lens structure are as follows: Figure 1A as well as Figure 1B As shown.

[0075] Example 3 like Figure 4As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacer element P2 located on the image side of the third lens E3 and in contact with the image side surface S4 of the third lens E3. The third spacer element P3 is in contact with the image side surface S6 of the lens E3; the fourth spacer element P4 is located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4; the fifth spacer element P5 is located on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5; the sixth spacer element P6 is located on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6; the seventh spacer element P7 is located on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side surface S16 of the eighth lens E8.

[0076] In this embodiment, the spacing assembly further includes a fourth auxiliary spacing element P4b disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth spacing element P4; a seventh auxiliary spacing element P7b disposed between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh spacing element P7; a fourth secondary auxiliary spacing element P4c disposed on the image side of the fourth auxiliary spacing element P4b and in contact with the image side of the fourth auxiliary spacing element P4b; and a seventh secondary auxiliary spacing element P7c disposed on the image side of the seventh auxiliary spacing element P7b and in contact with the image side of the seventh auxiliary spacing element P7b.

[0077] 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 Table 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 above lies in the different dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 3 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0078] Simulation tests showed that the on-axis chromatic aberration curves of the optical lenses in Examples 1, 2, and 3 are as follows: Figure 5A As shown, this represents the degree of deviation of the focal point after light of different wavelengths passes 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 magnification chromatic aberration curves of the optical lenses in Embodiments 1, 2, and 3 are shown in the figure. Figure 5C As shown. According to Figure 5A , Figure 5B as well as Figure 5C It can be seen that the optical lenses in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0079] Example 4 like Figure 6 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacer element P2 located on the image side of the third lens E3 and in contact with the image side surface S4 of the third lens E3. The third spacer element P3 is in contact with the image side surface S6 of the lens E3; the fourth spacer element P4 is located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4; the fifth spacer element P5 is located on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5; the sixth spacer element P6 is located on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6; the seventh spacer element P7 is located on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side surface S16 of the eighth lens E8.

[0080] In this embodiment, the first lens E1 has negative optical power, and its object-side surface S1 and image-side surface S2 are convex and concave, respectively; the second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are convex and concave, respectively; the third lens E3 has negative optical power, and its object-side surface S5 and image-side surface S6 are convex and concave, respectively; the fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are concave, respectively. The fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are convex and concave, respectively; the sixth lens E6 has positive optical power, and its object-side surface S11 and image-side surface S12 are both convex; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are both concave; the eighth lens E8 has negative optical power, and its object-side surface S15 and image-side surface S16 are both concave and convex, respectively.

[0081] In addition, Table 3 shows the basic optical parameters of the optical imaging lens of Embodiment 4, wherein the units of radius of curvature and thickness are millimeters (mm).

[0082] Table 3: Basic optical parameters of the optical lens in Example 4 In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1, S2, and S5 to S16 in Embodiment 4.

[0083] Table 4: Aspherical coefficients of the optical lens in Example 4 Example 5 like Figure 7As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacer element P2 located on the image side of the third lens E3 and in contact with the image side surface S4 of the third lens E3. The third spacer element P3 is in contact with the image side surface S6 of the lens E3; the fourth spacer element P4 is located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4; the fifth spacer element P5 is located on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5; the sixth spacer element P6 is located on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6; the seventh spacer element P7 is located on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side surface S16 of the eighth lens E8.

[0084] In this embodiment, the spacing assembly further includes a fourth auxiliary spacing element P4b disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth spacing element P4, and a fourth secondary auxiliary spacing element P4c disposed on the image side of the fourth auxiliary spacing element P4b and in contact with the image side of the fourth auxiliary spacing element P4b.

[0085] 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 Table 4. 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 above lies in the different dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 5 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0086] Example 6 like Figure 8As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacer element P2 located on the image side of the third lens E3 and in contact with the image side surface S4 of the third lens E3. The third spacer element P3 is in contact with the image side surface S6 of the lens E3; the fourth spacer element P4 is located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4; the fifth spacer element P5 is located on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5; the sixth spacer element P6 is located on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6; the seventh spacer element P7 is located on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side surface S16 of the eighth lens E8.

[0087] In this embodiment, the spacing assembly further includes a fourth auxiliary spacing element P4b disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth spacing element P4; a fifth auxiliary spacing element P5b disposed between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth spacing element P5; a fourth secondary auxiliary spacing element P4c disposed on the image side of the fourth auxiliary spacing element P4b and in contact with the image side of the fourth auxiliary spacing element P4b; and a fifth secondary auxiliary spacing element P5c disposed on the image side of the fifth auxiliary spacing element P5b and in contact with the image side of the fifth auxiliary spacing element P5b.

[0088] 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 Table 4. 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 of the lens barrel and spacer assembly in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 6 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0089] Simulation tests showed that the on-axis chromatic aberration curves of the optical lenses in Examples 4, 5, and 6 are as follows: Figure 9A As shown, this indicates the degree of deviation of the focal point after light of different wavelengths passes through the optical lens; the astigmatism curves of the optical lenses in Examples 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 magnification chromatic aberration curves of the optical lenses in Examples 4, 5, and 6 are shown in the figure. Figure 9C As shown. According to Figure 9A , Figure 9B as well as Figure 9C It can be seen that the optical lenses in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0090] Example 7 like Figure 10 As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacer element P2 located on the image side of the third lens E3 and in contact with the image side surface S4 of the third lens E3. The third spacer element P3 is in contact with the image side surface S6 of the lens E3; the fourth spacer element P4 is located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4; the fifth spacer element P5 is located on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5; the sixth spacer element P6 is located on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6; the seventh spacer element P7 is located on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side surface S16 of the eighth lens E8.

[0091] In this embodiment, the first lens E1 has positive optical power, and its object-side surface S1 and image-side surface S2 are convex and concave, respectively; the second lens E2 has positive optical power, and its object-side surface S3 and image-side surface S4 are both convex; the third lens E3 has negative optical power, and its object-side surface S5 and image-side surface S6 are both convex and concave, respectively; the fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are both concave. The fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are convex and concave, respectively; the sixth lens E6 has positive optical power, and its object-side surface S11 and image-side surface S12 are both convex; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are both concave; the eighth lens E8 has positive optical power, and its object-side surface S15 and image-side surface S16 are both convex.

[0092] In addition, Table 5 shows the basic optical parameters of the optical imaging lens of Embodiment 7, wherein the units of radius of curvature and thickness are millimeters (mm).

[0093] Table 5: Basic optical parameters of the optical lens in Example 7 In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 6 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1, S2, and S5 to S8 in Embodiment 7.

[0094] Table 6: Aspherical coefficient table of the optical lens in Example 7 Example 8 like Figure 11As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacer element P2 located on the image side of the third lens E3 and in contact with the image side surface S4 of the third lens E3. The third spacer element P3 is in contact with the image side surface S6 of the lens E3; the fourth spacer element P4 is located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4; the fifth spacer element P5 is located on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5; the sixth spacer element P6 is located on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6; the seventh spacer element P7 is located on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side surface S16 of the eighth lens E8.

[0095] In this embodiment, the spacing assembly further includes a fourth auxiliary spacing element P4b disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth spacing element P4, and a fourth secondary auxiliary spacing element P4c disposed on the image side of the fourth auxiliary spacing element P4b and in contact with the image side of the fourth auxiliary spacing element P4b.

[0096] It is worth noting that, compared with Embodiment 7 above, the optical lens of Embodiment 8 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 8 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the optical lens of Embodiment 8 has different structural parameters than the optical lens of Embodiment 7 above. That is, the difference between Embodiment 8 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 8 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0097] Example 9 like Figure 12As shown, in this embodiment, the optical lens includes a lens barrel P0 and a lens group and a spacer assembly housed within the lens barrel P0; the lens group includes, arranged sequentially along the optical axis from the object side to the image side: 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; the spacer assembly includes a first spacer element P1 located on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer element P2 located on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, and a third spacer element P2 located on the image side of the third lens E3 and in contact with the image side surface S4 of the third lens E3. The third spacer element P3 is in contact with the image side surface S6 of the lens E3; the fourth spacer element P4 is located on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4; the fifth spacer element P5 is located on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5; the sixth spacer element P6 is located on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6; the seventh spacer element P7 is located on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side surface S16 of the eighth lens E8.

[0098] In this embodiment, the spacing assembly further includes a fourth auxiliary spacing element P4b disposed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth spacing element P4; a sixth auxiliary spacing element P6b disposed between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth spacing element P6; a fourth secondary auxiliary spacing element P4c disposed on the image side of the fourth auxiliary spacing element P4b and in contact with the image side of the fourth auxiliary spacing element P4b; and a sixth secondary auxiliary spacing element P6c disposed on the image side of the sixth auxiliary spacing element P6b and in contact with the image side of the sixth auxiliary spacing element P6b.

[0099] It is worth noting that, compared with Embodiment 7 above, the optical lens of Embodiment 9 has the same optical parameters, that is, the basic optical parameter table of the optical lens of Embodiment 9 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the optical lens of Embodiment 9 has different structural parameters than the optical lens of Embodiment 7 above. That is, the difference between Embodiment 9 and Embodiment 7 above lies in the different dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical lens. Specifically, the values ​​of each relevant structural parameter in Embodiment 9 are shown in Table 8 below. The specific descriptions of multiple structural parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0100] Simulation tests showed that the on-axis chromatic aberration curves of the optical lenses in Examples 7, 8, and 9 were as follows: Figure 13A As shown, this indicates the degree of deviation of the focal point after light of different wavelengths passes 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 magnification chromatic aberration curves of the optical lenses in Examples 7, 8, and 9 are shown in the figure. Figure 13C As shown. According to Figure 13A , Figure 13B as well as Figure 13C It can be seen that the optical lenses in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0101] In summary, in Embodiments 1 to 12, the effective focal length f of the optical lens, the effective focal lengths f1 to f8 of the first lens E1 to the eighth lens E8 in the optical lens, the entrance pupil diameter EPD of the optical lens, the axial distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, the center thicknesses CT1, CT3, CT5, CT6, CT7 and CT8 of the first lens E1, the third lens E3, the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8, the air gaps T34, T56, T67 and T78 of the third lens E3 and the fourth lens E4, the fifth lens E5 and the sixth lens E6, the sixth lens E6 and the seventh lens E7 and the seventh lens E7 and the eighth lens E8 on the optical axis, and the radius of curvature R3 of the object side surface of the second lens E2 are shown in Table 7 below.

[0102] Table 7: System Optical Parameters of Optical Lenses Furthermore, the structural parameters of the optical lenses in Examples 1 to 9 are shown in Table 8.

[0103] Table 8: Structural Parameters of Optical Lenses In summary, the optical lenses in Examples 1 to 9 satisfy the relationships shown in Table 9, as detailed in Table 9.

[0104] Table 9: Relationships Satisfied by Optical Lenses It is worth mentioning that, according to one aspect of this application, one embodiment of this application further provides a camera module, which may include the aforementioned optical lens and a photosensitive element, the photosensitive element being disposed on the image side of the optical lens for imaging. It is understood that the photosensitive element mentioned in this application may, but is not limited to, be implemented as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device, and this application will not elaborate further on this.

[0105] Furthermore, according to another aspect of this application, one embodiment of this application provides an electronic device that may include a camera module and a processor as described above. The camera module is communicatively connected to the processor for acquiring image data and inputting the image data into the processor for processing. It is understood that the electronic device mentioned in this application may, but is not limited to, a device such as a mobile phone equipped with the camera module, and this application will not elaborate further on this.

[0106] 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.

[0107] 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: The optical lens comprises a lens barrel, a lens group accommodated in the lens barrel and a spacer assembly; the lens group comprises, in order from the object side to the image side along the optical axis: a first lens with optical power, a second lens with positive 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 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; the object side surface of the third lens is convex and the image side surface is concave; the object side surface of the fourth lens is concave and the image side surface is convex; the object side surface of the fifth lens is convex and the image side surface is concave; the image side surface of the sixth lens is convex; the object side surface and the image side surface of the seventh lens are both concave; and the image side surface of the eighth lens is convex; wherein the air gap of the sixth lens and the seventh lens along the optical axis is the largest among the air gaps of any two adjacent lenses of the lens group along the optical axis. The spacer assembly comprises a first spacer element in contact with the first lens at least partially on the image side of the first lens, a second spacer element in contact with the second lens at least partially on the image side of the second lens, a third spacer element in contact with the third lens at least partially on the image side of the third lens, a fourth spacer element in contact with the fourth lens at least partially on the image side of the fourth lens, a fifth spacer element in contact with the fifth lens at least partially on the image side of the fifth lens, a sixth spacer element in contact with the sixth lens at least partially on the image side of the sixth lens, and a seventh spacer element in contact with the seventh lens at least partially on the image side of the seventh lens; and the optical lens satisfies 3.60 < d6m / T67 < 7.55 and 11.85 < d5m / (CT6-CT7) < 13.60, wherein T67 is the air gap of the sixth lens and the seventh lens along the optical axis, CT6 is the center thickness of the sixth lens, CT7 is the center thickness of the seventh lens, d5m is the inner diameter of the image side surface of the fifth spacer element, and d6m is the inner diameter of the image side surface of the sixth spacer element. The optical lens satisfies 4.75 < f6 / (CT6+CP6) < 7.90, wherein CT6 is the center thickness of the sixth lens, f6 is the effective focal length of the sixth lens, and CP6 is the maximum thickness of the sixth spacer element along the optical axis.

2. The optical lens of claim 1, wherein, The optical lens satisfies 0.85 < EP67 / (T67-CT7) < 4.80, wherein T67 is the air gap of the sixth lens and the seventh lens along the optical axis, CT7 is the center thickness of the seventh lens, and EP67 is the distance between the sixth spacer element and the seventh spacer element along the optical axis. The optical lens satisfies 2.05 < EPD / (D1s-d1s) < 3.

10.

3. The optical lens of claim 1, wherein, ​ ​ 4. The optical lens of claim 1, wherein, ​ Wherein, EPD is an entrance pupil diameter of the optical lens, D1s is an outer diameter of an object side surface of the first spacer element, and d1s is an inner diameter of the object side surface of the first spacer element.

5. The optical lens of claim 1, wherein, The optical lens satisfies: 8.10 < d1s / (CT1 + CP1) < 9.75; Wherein, CP1 is a maximum thickness of the first spacer element along an optical axis direction, CT1 is a center thickness of the first lens, and d1s is an inner diameter of an object side surface of the first spacer element.

6. The optical lens of claim 1, wherein, The optical lens satisfies: 1.35 < (D5m - d5m) / T56 < 6.70; Wherein, d5m is an inner diameter of an image side surface of the fifth spacer element, D5m is an outer diameter of the image side surface of the fifth spacer element, and T56 is an air interval of the fifth lens and the sixth lens on the optical axis.

7. The optical lens of claim 1, wherein, The optical lens satisfies: 1.45 < f2 / d2s < 3.00; and 0.80 < D1m / R3 < 1.75; Wherein, d2s is an inner diameter of an object side surface of the second spacer element, D1m is an outer diameter of an image side surface of the first spacer element, f2 is an effective focal length of the second lens, and R3 is a curvature radius of an object side surface of the second lens.

8. The optical lens of claim 1, wherein, The optical lens satisfies: 0.85 ≤ EP45 / CT5 < 2.45; Wherein, EP45 is a distance from the fourth spacer element to the fifth spacer element along the optical axis direction, and CT5 is a center thickness of the fifth lens.

9. The optical lens of claim 1, wherein, The optical lens satisfies: -4.95 < f3 / d3s < -1.90; and 4.90 ≤ d3s / (CT3 + T34) < 6.15; Wherein, f3 is an effective focal length of the third lens, CT3 is a center thickness of the third lens, T34 is an air interval of the third lens and the fourth lens on the optical axis, and d3s is an inner diameter of an object side surface of the third spacer element.

10. The optical lens of claim 1, wherein, The optical lens satisfies: -2.75 < SAG71 / (CP6 + CT7) < -1.35; Wherein, SAG71 is an on-axis distance between a vertex of an effective radius of an object side surface of the seventh lens and an intersection of the object side surface of the seventh lens and the optical axis, CP6 is a maximum thickness of the sixth spacer element along the optical axis direction, and CT7 is a center thickness of the seventh lens.

11. The optical lens of claim 1, wherein, The optical lens satisfies: 6.25 < f6 / (CP5 + EP56 + CP6) ≤ 10.50; Wherein, f6 is an effective focal length of the sixth lens, EP56 is a distance from the fifth spacer element to the sixth spacer element along the optical axis direction, CP5 is a maximum thickness of the fifth spacer element along the optical axis direction, and CP6 is a maximum thickness of the sixth spacer element along the optical axis direction.

12. The optical lens of claim 1, wherein, The optical lens satisfies: -4.40 < f7 / (CT7 + EP67) < -2.55; Wherein, EP67 is a distance from the sixth spacer element to the seventh spacer element along the optical axis direction, CT7 is a center thickness of the seventh lens, and f7 is an effective focal length of the seventh lens.

13. The optical lens of claim 1, wherein, The optical lens satisfies: 6.45 < d7s / (CT7 + CT8) ≤ 8.40; Wherein, d7s is the inner diameter of the object side surface of the seventh spacer element, CT7 is the center thickness of the seventh lens, and CT8 is the center thickness of the eighth lens.

14. The optical lens of claim 1, wherein, The optical lens satisfies: 1.45 < T67 / T78 < 3.65; 1.05 < d7s / d6s < 1.

55. Wherein, T78 is the air interval of the seventh lens and the eighth lens on the optical axis, T67 is the air interval of the sixth lens and the seventh lens on the optical axis, d6s is the inner diameter of the object side surface of the sixth spacer element, and d7s is the inner diameter of the object side surface of the seventh spacer element.

15. The optical lens of claim 1, wherein, The spacer assembly further comprises an eighth spacer element, which is disposed on the image side of the eighth lens and at least partially in contact with the eighth lens.

16. The optical lens of claim 1, wherein, The spacer assembly further comprises a fourth auxiliary spacer element and a fourth secondary auxiliary spacer element, the fourth auxiliary spacer element is disposed on the image side of the fourth spacer element and at least partially in contact with the fourth spacer element, and the fourth secondary auxiliary spacer element is disposed on the image side of the fourth auxiliary spacer element and at least partially in contact with the fourth auxiliary spacer element.

Images