Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises a lens barrel, a lens set and a plurality of spacer elements contained in the lens barrel; the lens set comprises first to seventh lenses in sequence from an object side to an image side along an optical axis, at least one spacer element is contained between any two adjacent lenses in the optical imaging lens, and the optical imaging lens satisfies the following conditions: 0.55≤EP34 / (CT4+T34)<1.05 and -4.80≤f4 / d4s<-3.30, wherein EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction, CT4 is the center thickness of the fourth lens, T34 is the air spacing of the third lens and the fourth lens on the optical axis, f4 is the effective focal length of the fourth lens, and d4s is the inner diameter of the object side surface of the fourth spacer element. Through reasonable configuration of the refractive power of the lens set, design of the lens surface type and limitation of the key structural size of the spacer element between adjacent lenses, the assembly stability of the lens set can be improved, and then the imaging definition is improved.

Description

Technical Field

[0001] This invention relates to the field of optical elements, and more specifically, to a seven-element optical imaging lens. Background Technology

[0002] With the rapid iteration and development of electronic products such as smartphones, automotive cameras, security monitoring, action cameras, and AR / VR, camera lenses have become a core component for various terminal products to showcase their differentiated features and competitive imaging quality. Especially in the global smartphone field, seven-element optical imaging lenses, with their superior imaging capabilities, have gradually become the standard solution for the main camera of flagship models.

[0003] However, current seven-element optical imaging lenses still face the common technical bottleneck of balancing mechanical stability and optical performance in practical applications. On the one hand, the large number of lenses and long structural chain in a seven-element lens group easily lead to tolerance accumulation, resulting in insufficient positioning accuracy and poor assembly stability of the mid-section lens assembly, which in turn affects the reliability of the optical path. On the other hand, the fourth lens, as a key component for optical path control, lacks a reasonable matching relationship between its optical power and the aperture size of its corresponding supporting spacer element. This makes it prone to edge light leakage and stray light out-of-control problems at this position, affecting both the uniformity of image illumination and significantly reducing image sharpness, severely restricting the overall performance of the lens. Summary of the Invention

[0004] To address the aforementioned technical issues, this application provides a seven-element optical imaging lens. By optimizing the power distribution of each lens and the layout of the spacer elements, and by constraining the relevant parameters of the fourth lens and its corresponding supporting spacer elements, the lens achieves the dual purpose of improving structural reliability and suppressing light leakage and stray light, ultimately achieving a balance between optical performance and mechanical stability.

[0005] To achieve the aforementioned objectives, this application provides an optical imaging lens comprising a lens barrel and a lens group and multiple spacer elements housed within the lens barrel; the lens group comprises seven lenses, sequentially arranged along the optical axis from the object side to the image side: a first lens with positive optical power, its object side being convex and its image side being concave; a second lens with positive or negative optical power; a third lens with positive or negative optical power, its object side being convex; a fourth lens with negative optical power, its image side being concave; and a fifth lens with negative optical power, its object side being concave. The object side of the lens is concave; the sixth lens, with positive optical power, has a convex object side; the seventh lens, with negative optical power, has a convex object side and a concave image side; the plurality of spacers include a third spacer located between the third lens and the fourth lens, with the object side of the third spacer in contact with the image side of the third lens; and a fourth spacer located between the fourth lens and the fifth lens, with the object side of the fourth spacer in contact with the image side of the fourth lens. The optical imaging lens satisfies: 0.55≤EP34 / (CT4+T34)<1.05, -4.80≤f4 / d4s<-3.30; Wherein, EP34 is the distance along the optical axis from the image side of the third spacer to the object side of the fourth spacer, CT4 is the center thickness of the fourth lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, f4 is the effective focal length of the fourth lens, and d4s is the inner diameter of the object side of the fourth spacer.

[0006] In some embodiments, the plurality of spacers further includes a first spacer element located between the first lens and the second lens, wherein the object side of the first spacer element is in contact with the image side of the first lens. The optical imaging lens satisfies: 4.55≤R1 / CT1<5.15, 0.65<EP01 / (CT1+T12)<1.15; Wherein, R1 is the radius of curvature of the object side surface of the first lens, CT1 is the center thickness of the first lens, EP01 is the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0007] In some embodiments, the optical imaging lens satisfies: 5.33 ≤ d0s / EP01 < 7.60; Wherein, d0s is the inner diameter of the object side surface of the lens barrel, and EP01 is the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element.

[0008] In some embodiments, the optical imaging lens satisfies: 3.34 ≤ f1 / d1s ≤ 4.00; Where f1 is the effective focal length of the first lens, and d1s is the inner diameter of the object side surface of the first spacer element.

[0009] In some embodiments, the plurality of spacers further includes a second spacer, the second spacer being located between the second lens and the third lens, and the object side of the second spacer being in contact with the image side of the second lens. The optical imaging lens satisfies: 5.19≤d3s / EP23≤6.73; Wherein, d3s is the inner diameter of the object side surface of the third spacer element, and EP23 is the distance along the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element.

[0010] In some embodiments, the optical imaging lens satisfies: 0.38≤(D4s-D3m) / EP34<3.05, where D4s is the outer diameter of the object side of the fourth spacer element, D3m is the outer diameter of the image side of the third spacer element, and EP34 is the distance along the optical axis from the image side of the third spacer element to the object side of the fourth spacer element.

[0011] In some embodiments, the optical imaging lens satisfies: 0.15 < d4s / R8 < 0.65, where d4s is the inner diameter of the object-side surface of the fourth spacer element, and R8 is the radius of curvature of the image-side surface of the fourth lens.

[0012] In some embodiments, the plurality of spacers further includes a fifth spacer element, the fifth spacer element being located between the fifth lens and the sixth lens, and the object side of the fifth spacer element being in contact with the image side of the fifth lens. The optical imaging lens satisfies: 0.50 < EP45 / CT5 < 0.95; Wherein, EP45 is the distance along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and CT5 is the center thickness of the fifth lens.

[0013] In some embodiments, the optical imaging lens satisfies: 1.68 ≤ (D5s - DP5) / CP5 ≤ 6.25; Wherein, D5s is the outer diameter of the object side of the fifth spacer element, DP5 is the maximum diameter of the fifth lens, and CP5 is the maximum thickness of the fifth spacer element along the optical axis.

[0014] In some embodiments, the optical imaging lens satisfies: 0.28 ≤ CP5 / (d5m-d5s) ≤ 0.80; Wherein, CP5 is the maximum thickness of the fifth spacer element along the optical axis, d5m is the inner diameter of the image side of the fifth spacer element, and d5s is the inner diameter of the object side of the fifth spacer element.

[0015] In some embodiments, the plurality of spacers further includes a sixth spacer, the sixth spacer being located between the sixth lens and the seventh lens, and the object side of the sixth spacer being in contact with the image side of the sixth lens. The optical imaging lens satisfies: 0.54≤(T56+CT6) / EP56≤1.42; Wherein, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, CT6 is the center thickness of the sixth lens, and EP56 is the distance along the optical axis from the image side of the fifth spacer element to the object side of the sixth spacer element.

[0016] In some embodiments, the plurality of spacers further includes a fifth auxiliary spacer, the fifth auxiliary spacer being located between the fifth spacer and the sixth lens, with the object side of the fifth auxiliary spacer in contact with the image side of the fifth spacer. The optical imaging lens satisfies: 2.17≤DP6 / (D5bm-d5bm) ≤3.17; Wherein, DP6 is the maximum diameter of the sixth lens, D5bm is the outer diameter of the image-side surface of the fifth auxiliary spacer element, and d5bm is the inner diameter of the image-side surface of the fifth auxiliary spacer element.

[0017] In some embodiments, the plurality of spacers further includes a seventh spacer, the seventh spacer being located on the image side of the seventh lens and the object side of the seventh spacer being in contact with the image side of the seventh lens. The optical imaging lens satisfies: 0.58≤CT7 / T67≤2.41, -1.12≤SAG71 / EP67≤-0.48; Wherein, CT7 is the center thickness of the seventh lens, T67 is the air gap between the sixth and seventh lenses on the optical axis, SAG71 is the axial displacement from the intersection of the object side and the optical axis of the seventh lens to the vertex of the effective optical radius of the image side of the seventh lens, and EP67 is the distance along the optical axis from the image side of the sixth spacer element to the object side of the seventh spacer element.

[0018] In some embodiments, the optical imaging lens satisfies: 0.27 ≤ (D6s - d6s) / f6 ≤ 1.05; Wherein, D6s is the outer diameter of the object side surface of the sixth spacer element, d6s is the inner diameter of the object side surface of the sixth spacer element, and f6 is the effective focal length of the sixth lens.

[0019] In some embodiments, the optical imaging lens satisfies: 0.78 ≤ (D0m - D0s) / f ≤ 1.37. Wherein, D0m is the outer diameter of the image side of the lens barrel, D0s is the outer diameter of the object side of the lens barrel, and f is the effective focal length of the optical imaging lens.

[0020] By using the optical imaging lens provided above, the optical imaging lens of this application can effectively improve the assembly stability of the lens group, ensure the relative position accuracy of each lens, suppress edge leakage and stray light in the optical path, and make the imaging light uniformly transmitted to the image plane by reasonably configuring the optical power and surface distribution of the lens group and limiting the layout of the spacing elements and key structural dimensions and optical parameter matching relationship between adjacent lenses. At the same time, it can suppress edge leakage and stray light in the optical path, and make the imaging light uniformly transmitted to the image plane, thereby improving the imaging clarity. Attached Figure Description

[0021] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein: Figure 1 A schematic diagram showing some parameters of the optical imaging lens according to an embodiment of this application is shown; Figure 2 The stray light spot diagram of Comparative Example 1 of this application is shown when EP34 / (CT4+T34)=0.34 and f4 / d4s=-5.02 is displayed; Figure 3 The stray light spot diagram of Embodiment 1-1 of this application is shown when EP34 / (CT4+T34)=0.87 and f4 / d4s=-3.96 is satisfied; Figure 4The stray light spot diagram of Embodiment 3-1 of this application is shown when EP34 / (CT4+T34)=0.92 and f4 / d4s=-3.49 is satisfied; Figure 5 The stray light spot pattern shown in Comparative Example 2 of this application is when EP34 / (CT4+T34)=1.22 and f4 / d4s=-2.56 is satisfied; Figure 6 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of this application is shown; Figure 7 A schematic diagram of the structure of the optical imaging lens of Embodiments 1-2 of this application is shown; Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiments 1-3 of this application is shown; Figure 9 The on-axis chromatic aberration curve of the optical imaging lens of the first embodiment of this application is shown; Figure 10 The astigmatism curve of the optical imaging lens of the first embodiment of this application is shown; Figure 11 The distortion curve of the optical imaging lens of the first embodiment of this application is shown; Figure 12 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-1 of this application is shown; Figure 13 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-2 of this application is shown; Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiments 2-3 of this application is shown; Figure 15 The on-axis chromatic aberration curve of the optical imaging lens of the second embodiment of this application is shown; Figure 16 The astigmatism curve of the optical imaging lens of the second embodiment of this application is shown; Figure 17 The distortion curve of the optical imaging lens of the second embodiment of this application is shown; Figure 18 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of this application is shown; Figure 19 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of this application is shown; Figure 20 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-3 of this application is shown; Figure 21 The on-axis chromatic aberration curve of the optical imaging lens of the third embodiment of this application is shown; Figure 22The astigmatism curve of the optical imaging lens of the third embodiment of this application is shown; Figure 23 The distortion curve of the optical imaging lens of the third embodiment of this application is shown. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings. In the drawings, for ease of explanation, the thickness, size, and shape of the lens (hereinafter referred to as a lens) have been slightly exaggerated. 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 merely illustrative and not strictly to scale.

[0024] In this paper, the surface of each lens and spacer element, as well as other elements, that is closest to the subject (not shown in the figure) is called the object side of the lens / spacer element, and the surface that is closest to the imaging plane is called the image side of the lens / spacer element.

[0025] The center thickness mentioned above and below refers to the thickness of the lens on the optical axis, that is, the straight-line distance between the center points of the two optical surfaces of the lens (usually the object side and the image side of the lens); the air gap refers to the center distance between the image side of the first lens and the object side of the second lens between two adjacent lenses; the distance along the optical axis refers to the straight-line distance between two optical surfaces (or structural features) along the optical axis of the optical imaging lens.

[0026] In this specification, 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 of the lens surface in the paraxial region can be determined based on the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software). For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0027] Current seven-element optical imaging lenses face a common technical bottleneck in practical applications: the difficulty of simultaneously achieving mechanical stability and optical performance. This includes the contradiction between structural complexity and poor assembly stability due to accumulated tolerances, as well as issues related to the matching of optical power and mounting dimensions of key lenses. These problems can easily lead to decreased lens assembly stability and increased stray light, among other adverse effects.

[0028] In view of this, such as Figure 1 As shown, this application provides an optical imaging lens, including: a lens barrel and a lens group and a plurality of spacer elements housed within the lens barrel. The lens group includes, along the optical axis from the object side to the image side, a first lens to a seventh lens in sequence: a first lens having positive optical power, with its object side being convex and its image side being concave; a second lens having positive or negative optical power; a third lens having positive or negative optical power, with its object side being convex; a fourth lens having negative optical power, with its image side being concave; a fifth lens having negative optical power, with its object side being concave; a sixth lens having positive optical power, with its object side being convex; and a seventh lens having negative optical power, with its object side being convex and its image side being concave.

[0029] The plurality of spacers include a third spacer located between the third lens and the fourth lens, wherein the object side of the third spacer is in contact with the image side of the third lens; and a fourth spacer located between the fourth lens and the fifth lens, wherein the object side of the fourth spacer is in contact with the image side of the fourth lens.

[0030] In some embodiments of this application, the optical imaging lens satisfies: 0.55≤EP34 / (CT4+T34)<1.05, -4.80≤f4 / d4s<-3.30; Wherein, EP34 is the distance along the optical axis from the image side of the third spacer to the object side of the fourth spacer, CT4 is the center thickness of the fourth lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, f4 is the effective focal length of the fourth lens, and d4s is the inner diameter of the object side of the fourth spacer.

[0031] To clearly demonstrate the specific impact of the above parameter constraints on stray light, an analysis is now conducted in conjunction with the accompanying figures. Figures 2 to 5 The diagram shows stray light spots at different ranges for some parameters of the optical imaging lens.

[0032] exist Figures 2 to 5 In this diagram, the origin is set at the center of the image plane (0,0), and the scattered points represent the points where light rays fall, used to evaluate the spatial distribution of stray light. The X-axis represents the horizontal coordinate on the image plane, in mm; the Y-axis represents the vertical coordinate on the image plane, in mm.

[0033] like Figure 2 As shown, when an optical imaging lens satisfies EP34 / (CT4+T34)=0.34 and f4 / d4s=-5.02, the ratio of the relevant parameters is lower than the lower threshold. At this time, the distance between the third and fourth spacers is too small, and the aperture of the fourth spacer is too small. This not only easily causes light blockage and insufficient light transmission, but also leads to insufficient aberration correction. Large-angle incident light rays are reflected on its inner diameter surface, and there are obvious arc-shaped stray lights in the stray light spot pattern.

[0034] like Figure 3 As shown, when the optical imaging lens in one embodiment of this application satisfies EP34 / (CT4+T34)=0.87 and f4 / d4s=-3.96, the ratio of the relevant parameters is within the above range, and no obvious stray light spots appear in the stray light spot image.

[0035] like Figure 4 As shown, when the optical imaging lens in one embodiment of this application satisfies EP34 / (CT4+T34)=0.92 and f4 / d4s=-3.49, the ratio of the relevant parameters is within the above range, and no obvious stray light spots appear in the stray light spot image.

[0036] like Figure 5 As shown, when an optical imaging lens satisfies EP34 / (CT4+T34)=1.22 and f4 / d4s=-2.56, the ratio of the relevant parameters is higher than the upper limit threshold. At this time, the aperture of the fourth spacer element is too large, causing a fog-like light leakage phenomenon, and there are a large number of light spots in the stray light spot image.

[0037] Based on the above comparative analysis, it can be seen that by reasonably limiting the structural dimensions of the third lens, the fourth lens, the spacer element, and the optical power of the lenses, this application can achieve a reasonable allocation of the axial assembly space of the middle lens group, effectively improving the assembly accuracy and structural stability of the lens group; at the same time, it can make the optical power and the light-transmitting aperture well matched, which helps to intercept the light leakage beam at the edge of the fourth lens, reduce the risk of light leakage, and ensure that the light is uniformly transmitted to the image plane, thereby achieving the dual purpose of improving the stability of lens assembly and image quality.

[0038] In some embodiments of this application, the plurality of spacers further includes a first spacer element, the first spacer element being located between the first lens and the second lens, and the object-side surface of the first spacer element partially contacting the image-side surface of the first lens; the optical imaging lens satisfies: 4.55≤R1 / CT1<5.15, 0.65<EP01 / (CT1+T12)<1.15; Wherein, R1 is the radius of curvature of the object side surface of the first lens, CT1 is the center thickness of the first lens, EP01 is the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0039] By constraining the ratio range of the above-mentioned conditional expressions, the assembly and positioning accuracy between the lens barrel, the first lens, and the first spacer element are optimized, effectively improving the coaxiality and assembly stability of each group of optical elements. At the same time, the deflection angle and divergence of external incident light can be controlled, optimizing the transmission trend of the front-end optical path, smoothing the changes in light refraction, and ensuring that the incident beam is transmitted to the second lens smoothly and orderly at a reasonable angle, reducing the accumulation of aberrations and stray light interference in the front-end optical path, thereby improving the overall imaging quality of the lens.

[0040] In some embodiments of this application, the optical imaging lens satisfies: 5.33≤d0s / EP01<7.60; Wherein, d0s is the inner diameter of the object side surface of the lens barrel, and EP01 is the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element.

[0041] By limiting the ratio of the inner diameter d0s of the lens barrel's object side to the axial distance EP01 within a reasonable range, the radial light-gathering size and axial layout of the lens front end can be matched, effectively ensuring the rigidity and stability of the lens barrel's object side end. A reasonable ratio avoids the problem of an excessively small aperture limiting the field of view, or an excessively large aperture causing uncontrolled edge beams. Controlling these structural dimensions within a reasonable range helps constrain the propagation path of edge light, reduces reflection interference from stray light, thereby optimizing the front-end optical path environment, improving image uniformity and purity, and enhancing overall image quality.

[0042] In some embodiments of this application, the optical imaging lens satisfies: 3.34≤f1 / d1s≤4.00; Where f1 is the effective focal length of the first lens, and d1s is the inner diameter of the object side surface of the first spacer element.

[0043] By controlling the ratio of the effective focal length of the first lens to the inner diameter of the side surface of the first spacer element, sufficient effective light transmission is ensured in the system, preventing insufficient light from causing a dark image or a decrease in image quality. At the same time, this ratio can effectively block excess stray light from the edges, suppress stray light interference, thereby optimizing the front-end optical path transmission effect, stabilizing optical performance, and ensuring the overall imaging effect of the lens.

[0044] In some embodiments of this application, the plurality of spacers further includes a second spacer element located between the second lens and the third lens, with the object-side surface of the second spacer element partially contacting the image-side surface of the second lens; the optical imaging lens satisfies: 5.19≤d3s / EP23≤6.73; Wherein, d3s is the inner diameter of the object side surface of the third spacer element, and EP23 is the distance along the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element.

[0045] By rationally matching the dimensional relationship between the object-side inner diameter and the axial spacing of the third spacer element, sufficient mounting space is reserved for the third lens, improving lens forming and processing capabilities and enhancing assembly positioning stability. Simultaneously, this ratio effectively blocks stray light from entering the optical effective diameter area of ​​the fourth lens, reducing stray light interference within the optical path, optimizing the mid-section light transmission environment, and effectively improving the overall optical performance and image quality of the lens.

[0046] In some embodiments of this application, the optical imaging lens satisfies: 0.38 ≤ (D4s - D3m) / EP34 < 3.05; Wherein, D4s is the outer diameter of the object side of the fourth spacer element, D3m is the outer diameter of the image side of the third spacer element, and EP34 is the distance along the optical axis from the image side of the third spacer element to the object side of the fourth spacer element.

[0047] By constraining the dimensional difference between the object-side outer diameter of the fourth spacer element and the image-side outer diameter of the third spacer element, as well as the ratio range of their axial spacing, the radial fit relationship and axial layout of the two sets of spacer elements can be effectively controlled, improving the connection accuracy between the two inside the lens barrel, reducing assembly misalignment and structural interference problems, avoiding lens tilting and displacement under force, and enhancing the overall assembly accuracy and mechanical stability of the lens mid-section structure.

[0048] In some embodiments of this application, the optical imaging lens satisfies: 0.15 < d4s / R8 < 0.65, where d4s is the inner diameter of the object side of the fourth spacer element and R8 is the radius of curvature of the image side of the fourth lens.

[0049] By constraining the range of the ratio between the inner diameter of the fourth spacer element's side surface and the radius of curvature of the fourth lens's image surface, the dimensions of the supporting structure and the surface shape of the lens can be reasonably matched, dispersing assembly stress, reducing local stress concentration, effectively avoiding lens deformation and breakage under pressure, and improving assembly reliability. Simultaneously, the path of reflected light from the image surface of the fourth lens can be reasonably controlled, suppressing the propagation of unwanted reflected light, reducing ghosting, stray light, and other undesirable optical phenomena, further optimizing the optical path environment, and improving the overall image quality and optical performance of the lens.

[0050] In some embodiments of this application, the plurality of spacers further includes a fifth spacer element, which is located between the fifth lens and the sixth lens, and the object-side surface of the fifth spacer element is in contact with the image-side surface of the fifth lens; the optical imaging lens satisfies: 0.50 < EP45 / CT5 < 0.95; Wherein, EP45 is the distance along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and CT5 is the center thickness of the fifth lens.

[0051] By reasonably adjusting the matching relationship between the axial assembly gap of the edge structure of the fifth lens and its center thickness, the appearance of the fifth lens can be guaranteed, the risk of defects such as weld lines and shrinkage deformation during injection molding can be reduced, the risk of structural interference caused by excessively small assembly gaps can be reduced, the assembly step difference can be guaranteed to be uniform, and the lens surface distortion or structural deformation caused by assembly extrusion can be avoided.

[0052] In some embodiments of this application, the optical imaging lens satisfies: 1.68≤(D5s-DP5) / CP5≤6.25; Wherein, D5s is the outer diameter of the object side of the fifth spacer element, DP5 is the maximum diameter of the fifth lens, and CP5 is the maximum thickness of the fifth spacer element along the optical axis.

[0053] By limiting the reasonable range of this ratio, the matching relationship between the radial dimension and axial thickness of the fifth spacer element can be optimized, enabling it to provide sufficient supporting contact surface for the fifth lens and effectively improving the overall structural strength. This avoids deformation under assembly stress or external impact, ensuring stable lens positioning and surface accuracy, and preventing structural deformation from degrading image quality.

[0054] In some embodiments of this application, the optical imaging lens satisfies the following conditions: 0.28≤CP5 / (d5m-d5s) ≤0.80; Wherein, CP5 is the maximum thickness of the fifth spacer element along the optical axis, d5m is the inner diameter of the image side of the fifth spacer element, and d5s is the inner diameter of the object side of the fifth spacer element.

[0055] By constraining the range of the ratio between the maximum thickness of the fifth spacer element and the difference in the inner diameters of the object and image on both sides, the overall size ratio of the element is optimized, effectively improving its mechanical strength and preventing deformation under stress.

[0056] In some embodiments of this application, the plurality of spacers further includes a sixth spacer, which is located between the sixth lens and the seventh lens, with the object-side surface of the sixth spacer in contact with the image-side surface of the sixth lens; the optical imaging lens satisfies: 0.54≤(T56+CT6) / EP56≤1.42; Wherein, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, CT6 is the center thickness of the sixth lens, and EP56 is the distance along the optical axis from the image side of the fifth spacer element to the object side of the sixth spacer element.

[0057] By using the proportional constraints of this conditional formula, the center thickness of the sixth lens and the overall structural thickness can be distributed evenly and reasonably, reducing defects such as weld lines during the molding process; at the same time, the lens assembly gap can be reasonably controlled to avoid the lens being assembled too tightly or too loosely in the lens barrel, thereby improving the structural assembly accuracy and mechanical stability.

[0058] In some embodiments of this application, the plurality of spacers further includes a fifth auxiliary spacer, which is located between the fifth spacer and the sixth lens, with the object-side surface of the fifth auxiliary spacer in contact with the image-side surface of the fifth spacer; the optical imaging lens satisfies the following conditions: 2.17≤DP6 / (D5bm-d5bm)≤3.17; Wherein, DP6 is the maximum diameter of the sixth lens, D5bm is the outer diameter of the image-side surface of the fifth auxiliary spacer element, and d5bm is the inner diameter of the image-side surface of the fifth auxiliary spacer element.

[0059] By constraining the proportional relationship between the maximum diameter of the sixth lens and the difference between the inner and outer diameters of the image side of the fifth auxiliary spacer element, the problems of matching stability and stray light suppression can be effectively solved. This ensures that the fifth auxiliary spacer element provides reliable radial support for the sixth lens, stabilizing the assembly structure; at the same time, by reasonably controlling the light-blocking range of the spacer element, internal reflected and scattered light are blocked from entering the sixth lens area, achieving a good stray light elimination effect.

[0060] In some embodiments of this application, the plurality of spacers further includes a seventh spacer, which is located on the image side of the seventh lens and the object side of the seventh spacer P7 is in partial contact with the image side of the seventh lens; the optical imaging lens satisfies: 0.58≤CT7 / T67≤2.41, -1.12≤SAG71 / EP67≤-0.48; Wherein, CT7 is the center thickness of the seventh lens, T67 is the air gap between the sixth and seventh lenses on the optical axis, SAG71 is the axial displacement from the intersection of the object side and the optical axis of the seventh lens to the vertex of the effective optical radius of the image side of the seventh lens, and EP67 is the distance along the optical axis from the image side of the sixth spacer element to the object side of the seventh spacer element.

[0061] By using two sets of conditional formulas, the air gap between the sixth and seventh lenses is reasonably controlled, the center thickness of the seventh lens and the convex shape of its object side are limited, and the edge thickness is avoided from being too thin. While ensuring mechanical stability, the lens arrangement in the rear half of the lens is uniform, the aberration correction effect is balanced, and the image quality is improved.

[0062] In some embodiments of this application, the optical imaging lens satisfies the following conditions: 0.27≤(D6s-d6s) / f6≤1.05; Wherein, D6s is the outer diameter of the object side surface of the sixth spacer element, d6s is the inner diameter of the object side surface of the sixth spacer element, and f6 is the effective focal length of the sixth lens.

[0063] By constraining the ratio of the difference between the inner and outer diameters of the sixth spacer element's side surface to the effective focal length of the sixth lens, it is possible to ensure that the lens has a suitable assembly support width, optimize the light convergence effect, improve the sharpness of the center image quality, reduce stray light generation, improve overall optical performance, and achieve a comprehensive balance between optical performance and structural reliability.

[0064] In some embodiments of this application, the optical imaging lens satisfies the following conditions: 0.78≤(D0m-D0s) / f≤1.37; Wherein, D0m is the outer diameter of the image side of the lens barrel, D0s is the outer diameter of the object side of the lens barrel, and f is the effective focal length of the optical imaging lens.

[0065] By using this conditional proportional constraint, the gradient design of the lens barrel wall thickness can be optimized, ensuring the overall support strength of the lens barrel for the lens group and spacer elements, making it resistant to temperature changes and mechanical impacts and not easily deformed; at the same time, it matches the overall refractive characteristics of the lens, avoids the adverse effects of reflection from the inner wall of the lens barrel tail end, effectively balances the structural strength of the lens barrel and the optical performance of the lens, and ensures image quality.

[0066] To more clearly illustrate the performance of the optical imaging lenses provided in the embodiments of this application, several embodiments of optical imaging lenses and specific numerical designs of the optical parameters of each optical imaging lens in each embodiment are provided below for reference.

[0067] It should be noted that in the first embodiment described below, there are three examples: Example 1-1, Example 1-2, and Example 1-3; in the second embodiment, there are three examples: Example 2-1, Example 2-2, and Example 2-3; and in the third embodiment, there are three examples: Example 3-1, Example 3-2, and Example 3-3.

[0068] The optical parameters of the imaging lenses in the three examples within the same embodiment are the same, while some structural parameters are different. Therefore, the values ​​of the conditional expressions are not the same in different examples within the same embodiment, and in different examples within different embodiments, but all are within the range of values ​​satisfied by the aforementioned conditional expressions.

[0069] It should be noted that any example of the first to third embodiments described below is applicable to all implementations of this application.

[0070] First Embodiment Figure 6 A schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 7 The diagram shows the structure of the optical imaging lens in Embodiments 1-2. Figure 8 A schematic diagram of the optical imaging lens of Embodiments 1-3 is shown.

[0071] like Figures 6 to 8 As shown, the optical imaging lens includes a lens barrel P0 and a lens group and multiple spacer elements housed within the lens barrel P0. The lens group includes, sequentially from the object side to the image side along the optical axis, a first lens E1 to a seventh lens E7; wherein, the first lens E1 has positive optical power, its object side S1 is convex, and its image side S2 is concave; the second lens E2 has negative optical power, its object side S3 is convex, and its image side S4 is concave; the third lens E3 has positive optical power, its object side S5 is convex, and its image side S6 is convex; the fourth lens E4 has negative optical power, its object side S7 is concave, and its image side S8 is concave; the fifth lens E5 has negative optical power, its object side S9 is concave, and its image side S10 is concave; the sixth lens E6 has positive optical power, its object side S11 is convex, and its image side S12 is concave; and the seventh lens E7 has negative optical power, its object side S13 is convex, and its image side S14 is concave.

[0072] Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S17. S15 and S16 can be the object-side and image-side surfaces of filters or protective glass, respectively, and S17 is the imaging surface (S15, S16, S17 are as follows). Figure 6 As shown in the attached figures, the rest are omitted.

[0073] The multiple spacer elements include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The positions of each spacer element have been described above and will not be repeated here.

[0074] Table 1 below shows the relevant parameters of the first embodiment in this application under Embodiments 1-1, 1-2, and 1-3, where the units of radius of curvature and center thickness / distance are millimeters (mm). In Table 1, OBJ (not shown in the figure) is the object plane, STO (not shown in the figure) is the aperture, and the aperture is set between the second lens E2 and the third lens E3.

[0075] Table 1

[0076] As shown in Table 1, in the first embodiment, the object-side surface and image-side surface of the first lens E1 to the seventh lens E7 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula: The surface equations of aspherical surfaces are typically defined by the radial distance (r), and all aspherical surface types in all embodiments of this paper are defined by this standard form:

[0077] The meanings of each parameter (coefficient) are as follows: K is the conic constant: used to describe the basic conic surface type of the aspheric surface, and is the core parameter that determines the overall shape of the aspheric surface; A4, A6, A8…A 2n These are higher-order coefficients: used to correct the shape of the basic conical surface and further optimize the curvature variation of the aspherical surface; c is the vertex curvature, which is the reciprocal of the radius of curvature R at the vertex, i.e., c = 1 / R. Its main function is to describe the basic curvature of the aspherical surface at the vertex position (r = 0, which is the highest point of the surface center).

[0078] Table 2 below shows the higher-order coefficients A4, A6...A30 of each surface S1-S14, which are aspherical surfaces and can be used in the first embodiment.

[0079] Table 2

[0080] Figure 9 , Figure 10 and Figure 11The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of the first embodiment are shown respectively.

[0081] Figure 9 The image shows the deflection of the focal point of light rays with wavelengths of 435nm, 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the optical imaging lens. The horizontal axis represents the offset in mm, and the vertical axis represents the normalized aperture.

[0082] Figure 10 This diagram shows the axial positional offset of light rays at different image heights after passing through an optical imaging lens, specifically the meridional and sagittal image planes. The vertical axis represents the image height in mm, and the horizontal axis represents the actual positional offset of the image plane in mm.

[0083] Figure 11 This shows the degree of deviation between the actual image height and the ideal image height of the optical imaging lens at different image height positions. The vertical axis represents the actual image height, and the horizontal axis represents the percentage (%) of the relative deviation between the actual image height and the ideal image height.

[0084] Depend on Figures 9 to 11 As can be seen, the optical imaging lens of the first embodiment has good control over on-axis chromatic aberration, astigmatism and distortion, and the optical imaging lens given in the first embodiment can achieve good imaging quality.

[0085] Second Embodiment Figure 12 A schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 13 A schematic diagram of the optical imaging lens of Embodiment 2-2 is shown. Figure 14 A schematic diagram of the optical imaging lens of Embodiments 2-3 is shown.

[0086] like Figures 12 to 14 As shown, the optical imaging lens includes a lens barrel P0 and a lens group and multiple spacer elements housed within the lens barrel P0. The lens group includes, sequentially from the object side to the image side along the optical axis, a first lens E1 to a seventh lens E7; wherein, the first lens E1 has positive optical power, its object side S1 is convex, and its image side S2 is concave; the second lens E2 has positive optical power, its object side S3 is concave, and its image side S4 is convex; the third lens E3 has negative optical power, its object side S5 is convex, and its image side S6 is concave; the fourth lens E4 has negative optical power, its object side S7 is convex, and its image side S8 is concave; the fifth lens E5 has negative optical power, its object side S9 is concave, and its image side S10 is convex; the sixth lens E6 has positive optical power, its object side S11 is convex, and its image side S12 is convex; and the seventh lens E7 has negative optical power, its object side S13 is convex, and its image side S14 is concave.

[0087] Light from the object passes through surfaces S1 to S14 in sequence and is finally imaged on imaging surface S17. S15 and S16 can be the object side and image side of a filter or protective glass, and S17 is the imaging surface.

[0088] The multiple spacer elements include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The positions of each spacer element have been described above and will not be repeated here.

[0089] Table 3 below shows the relevant parameters of the second embodiment of this application under embodiments 2-1, 2-2, and 2-3, where the units of radius of curvature and center thickness / distance are millimeters (mm). In this embodiment, the aperture STO is set between the first lens E1 and the second lens E2.

[0090] Table 3

[0091] Table 4 below shows the higher-order coefficients A4, A6...A30 of each surface S1-S14, which are aspherical surfaces and can be used in the second embodiment.

[0092] Table 4

[0093] Figure 15 , Figure 16 and Figure 17 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of the second embodiment are shown respectively.

[0094] Figure 15 The image shows the deflection of the focal point of light rays with wavelengths of 435nm, 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the optical imaging lens. The horizontal axis represents the offset in mm, and the vertical axis represents the normalized aperture.

[0095] Figure 16 This diagram shows the axial positional offset of light rays at different image heights after passing through an optical imaging lens, specifically the meridional and sagittal image planes. The vertical axis represents the image height in mm, and the horizontal axis represents the actual positional offset of the image plane in mm.

[0096] Figure 17 This shows the degree of deviation between the actual image height and the ideal image height of the optical imaging lens at different image height positions. The vertical axis represents the actual image height, and the horizontal axis represents the percentage (%) of the relative deviation between the actual image height and the ideal image height.

[0097] Depend on Figures 15 to 17 As can be seen, the optical imaging lens of the second embodiment has good control over on-axis chromatic aberration, astigmatism and distortion, and the optical imaging lens given in the second embodiment can achieve good imaging quality.

[0098] Third Embodiment Figure 18 A schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 19 A schematic diagram of the optical imaging lens of Embodiment 3-2 is shown. Figure 20 A schematic diagram of the optical imaging lens of Embodiment 3-3 is shown.

[0099] The optical imaging lens includes a lens barrel P0 and a lens group and multiple spacer elements housed within the lens barrel P0. The lens group includes, sequentially from the object side to the image side along the optical axis, a first lens E1 to a seventh lens E7; wherein, the first lens E1 has positive optical power, its object side S1 is convex, and its image side S2 is concave; the second lens E2 has negative optical power, its object side S3 is convex, and its image side S4 is concave; the third lens E3 has positive optical power, its object side S5 is convex, and its image side S6 is convex; the fourth lens E4 has negative optical power, its object side S7 is concave, and its image side S8 is concave; the fifth lens E5 has negative optical power, its object side S9 is concave, and its image side S10 is concave; the sixth lens E6 has positive optical power, its object side S11 is convex, and its image side S12 is concave; and the seventh lens E7 has negative optical power, its object side S13 is convex, and its image side S14 is concave.

[0100] Light from the object passes through surfaces S1 to S14 in sequence and is finally imaged on imaging surface S17. S15 and S16 can be the object side and image side of a filter or protective glass, and S17 is the imaging surface.

[0101] The multiple spacer elements include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The positions of each spacer element have been described above and will not be repeated here.

[0102] Table 5 below shows the relevant parameters of the third embodiment of this application under embodiments 3-1, 3-2, and 3-3, where the units of radius of curvature and center thickness / distance are millimeters (mm). In this embodiment, the aperture STO is set between the second lens E2 and the third lens E3.

[0103] Table 5

[0104] Table 6 below shows the higher-order coefficients A4, A6...A30 of each surface S1-S14, which are aspherical surfaces and can be used in the third embodiment.

[0105] Table 6

[0106] Figure 21 , Figure 22 and Figure 23 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of the third embodiment are shown respectively.

[0107] Figure 21 The image shows the deflection of the focal point of light rays with wavelengths of 435nm, 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the optical imaging lens. The horizontal axis represents the offset in mm, and the vertical axis represents the normalized aperture.

[0108] Figure 22 This diagram shows the axial positional offset of light rays at different image heights after passing through an optical imaging lens, specifically the meridional and sagittal image planes. The vertical axis represents the image height in mm, and the horizontal axis represents the actual positional offset of the image plane in mm.

[0109] Figure 23 This shows the degree of deviation between the actual image height and the ideal image height of the optical imaging lens at different image height positions. The vertical axis represents the actual image height, and the horizontal axis represents the percentage (%) of the relative deviation between the actual image height and the ideal image height.

[0110] Depend on Figures 21 to 23 As can be seen, the optical imaging lens of the third embodiment has good control over on-axis chromatic aberration, astigmatism and distortion, and the optical imaging lens given in the third embodiment can achieve good imaging quality.

[0111] In summary, the optical parameters of the optical imaging lenses 1-1, 1-2, 1-3, 2-1, 2-2, 2-3, 3-1, 3-2 and 3-3 in the first to third embodiments are shown in Table 7 below.

[0112] Table 7

[0113] The structural parameters of the optical imaging lenses 1-1, 1-2, 1-3, 2-1, 2-2, 2-3, 3-1, 3-2 and 3-3 in the first to third embodiments are shown in Table 8 below, and the unit is millimeters (mm).

[0114] Table 8

[0115] The optical imaging lenses 1-1, 1-2, 1-3, 2-1, 2-2, 2-3, 3-1, 3-2 and 3-3 of the first to third embodiments satisfy the relationship shown in Table 9.

[0116] Table 9

[0117] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An optical imaging lens, characterized in that, The optical imaging lens includes a lens barrel and a lens group and multiple spacer elements housed within the lens barrel; The lens group consists of seven lenses, arranged sequentially from the object side to the image side along the optical axis: The first lens with positive optical power has a convex object side and a concave image side. A second lens having positive or negative optical power; A third lens with positive or negative optical power has a convex object side. The fourth lens has negative optical power and its image-side surface is concave. The fifth lens has negative optical power and its object side is concave. The sixth lens has positive optical power and its object side is convex. The seventh lens with negative optical power has a convex object side and a concave image side. The plurality of spacers includes a third spacer element located between the third lens and the fourth lens, wherein the object-side surface of the third spacer element is in contact with the image-side surface of the third lens; and a fourth spacer element located between the fourth lens and the fifth lens, wherein the object-side surface of the fourth spacer element is in contact with the image-side surface of the fourth lens. The optical imaging lens satisfies: 0.55≤EP34 / (CT4+T34)<1.05; -4.80≤f4 / d4s<-3.30; Wherein, EP34 is the distance along the optical axis from the image side of the third spacer to the object side of the fourth spacer, CT4 is the center thickness of the fourth lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, f4 is the effective focal length of the fourth lens, and d4s is the inner diameter of the object side of the fourth spacer.

2. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a first spacer, which is located between the first lens and the second lens and the object side of the first spacer is in contact with the image side of the first lens. The optical imaging lens satisfies: 4.55≤R1 / CT1<5.15, 0.65<EP01 / (CT1+T12)<1.15; Wherein, R1 is the radius of curvature of the object side surface of the first lens, CT1 is the center thickness of the first lens, EP01 is the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element, and T12 is the air gap between the first lens and the second lens on the optical axis.

3. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a first spacer, which is located between the first lens and the second lens and the object side of the first spacer is in contact with the image side of the first lens. The optical imaging lens satisfies: 5.33 ≤ d0s / EP01 < 7.60; Wherein, d0s is the inner diameter of the object side surface of the lens barrel, and EP01 is the distance along the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element.

4. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a first spacer, which is located between the first lens and the second lens and the object side of the first spacer is in contact with the image side of the first lens. The optical imaging lens satisfies: 3.34 ≤ f1 / d1s ≤ 4.00; Where f1 is the effective focal length of the first lens, and d1s is the inner diameter of the object side surface of the first spacer element.

5. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a second spacer, which is located between the second lens and the third lens and the object side of the second spacer is in contact with the image side of the second lens. The optical imaging lens satisfies: 5.19≤d3s / EP23≤6.73; Wherein, d3s is the inner diameter of the object side surface of the third spacer element, and EP23 is the distance along the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element.

6. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 0.38 ≤ (D4s - D3m) / EP34 < 3.05; Wherein, D4s is the outer diameter of the object side of the fourth spacer element, D3m is the outer diameter of the image side of the third spacer element, and EP34 is the distance along the optical axis from the image side of the third spacer element to the object side of the fourth spacer element.

7. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 0.15 < d4s / R8 < 0.65; Wherein, d4s is the inner diameter of the object side of the fourth spacer element, and R8 is the radius of curvature of the image side of the fourth lens.

8. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a fifth spacer, which is located between the fifth lens and the sixth lens and the object side of the fifth spacer is in contact with the image side of the fifth lens. The optical imaging lens satisfies: 0.50 < EP45 / CT5 < 0.95; Wherein, EP45 is the distance along the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element, and CT5 is the center thickness of the fifth lens.

9. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers includes a fifth spacer, which is located between the fifth lens and the sixth lens, and the object side of the fifth spacer is in contact with the image side of the fifth lens. The optical imaging lens satisfies: 1.68≤(D5s-DP5) / CP5≤6.25; Wherein, D5s is the outer diameter of the object side of the fifth spacer element, DP5 is the maximum diameter of the fifth lens, and CP5 is the maximum thickness of the fifth spacer element along the optical axis.

10. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers includes a fifth spacer, which is located between the fifth lens and the sixth lens, and the object side of the fifth spacer is in contact with the image side of the fifth lens. The optical imaging lens satisfies: 0.28 ≤ CP5 / (d5m-d5s) ≤ 0.80; Wherein, CP5 is the maximum thickness of the fifth spacer element along the optical axis, d5m is the inner diameter of the image side of the fifth spacer element, and d5s is the inner diameter of the object side of the fifth spacer element.

11. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a fifth spacer, which is located between the fifth lens and the sixth lens and the object side of the fifth spacer is in contact with the image side of the fifth lens. A sixth spacer element, wherein the sixth spacer element is located between the sixth lens and the seventh lens and the object side of the sixth spacer element is in contact with the image side of the sixth lens; The optical imaging lens satisfies: 0.54≤(T56+CT6) / EP56≤1.42; Wherein, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, CT6 is the center thickness of the sixth lens, and EP56 is the distance along the optical axis from the image side of the fifth spacer element to the object side of the sixth spacer element.

12. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a fifth spacer, which is located between the fifth lens and the sixth lens and the object side of the fifth spacer is in contact with the image side of the fifth lens. A fifth auxiliary spacer element is located between the fifth spacer element and the sixth lens, and the object side of the fifth auxiliary spacer element is in contact with the image side of the fifth spacer element. The optical imaging lens satisfies: 2.17≤DP6 / (D5bm-d5bm) ≤3.17; Wherein, DP6 is the maximum diameter of the sixth lens, D5bm is the outer diameter of the image-side surface of the fifth auxiliary spacer element, and d5bm is the inner diameter of the image-side surface of the fifth auxiliary spacer element.

13. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a sixth spacer, which is located between the sixth lens and the seventh lens and the object side of the sixth spacer is in contact with the image side of the sixth lens. A seventh spacer element, wherein the seventh spacer element is located on the image side of the seventh lens and the object side of the seventh spacer element is in contact with the image side of the seventh lens; The optical imaging lens satisfies: 0.58≤CT7 / T67≤2.41, -1.12≤SAG71 / EP67≤-0.48; Wherein, CT7 is the center thickness of the seventh lens, T67 is the air gap between the sixth and seventh lenses on the optical axis, SAG71 is the axial displacement from the intersection of the object side and the optical axis of the seventh lens to the vertex of the effective optical radius of the image side of the seventh lens, and EP67 is the distance along the optical axis from the image side of the sixth spacer element to the object side of the seventh spacer element.

14. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a sixth spacer, which is located between the sixth lens and the seventh lens and the object side of the sixth spacer is in contact with the image side of the sixth lens. The optical imaging lens satisfies: 0.27≤(D6s-d6s) / f6≤1.05; Wherein, D6s is the outer diameter of the object side surface of the sixth spacer element, d6s is the inner diameter of the object side surface of the sixth spacer element, and f6 is the effective focal length of the sixth lens.

15. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 0.78≤(D0m-D0s) / f≤1.37; Wherein, D0m is the outer diameter of the image side of the lens barrel, D0s is the outer diameter of the object side of the lens barrel, and f is the effective focal length of the optical imaging lens.

Images