Optical imaging lens

Abstract

The present application relates to a kind of optical imaging lenses, including first lens barrel and second lens barrel sequentially arranged from object side to image side along optical axis;The first lens barrel contains first lens group, the first lens group includes the first lens with negative optical power, and the object side surface and the image side surface of the first lens are both concave;The second lens barrel contains second lens group and multiple spacer elements, and the second lens group includes second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens sequentially from object side to image side along optical axis;The optical imaging lens satisfies:1.59≤ΔL / T12<2.20;1.15<D01m-D02s≤2.50;2.20<EL22 / CT2<2.90.The present application improves the structure relationship of lens barrel and front end lens, improves the internal stress distribution by optimizing the design and improves the optical performance, effectively reduces the assembly stress and improves the clamping precision and stability under the premise of guaranteeing optical performance.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and more particularly to an optical imaging lens. Background Technology

[0002] With the widespread application of optical imaging equipment in mobile terminals, vehicle cameras, security monitoring, and other fields, lens systems are constantly evolving towards miniaturization, wide-angle capabilities, and high performance. To meet the optical design requirements within compact spaces, split-tube structures have gradually become the mainstream solution. This involves assembling a first and second lens tube by snapping them together, facilitating lens assembly and adjustment. However, this structure has drawbacks in practical applications: insufficient machining tolerances and fitting precision at the snap-fit ​​interface between the two lens tubes during assembly can easily lead to localized stress concentration. This stress can cause lens deformation under pressure, deviations from the design air gap, and consequently, increased aberrations such as astigmatism and field curvature, resulting in decreased image quality. Furthermore, stress concentration can also cause lens tube cracking or lens edge breakage, severely reducing product yield and structural reliability.

[0003] In existing technologies, although attempts have been made to alleviate stress by optimizing materials or adding buffer structures, the problem of system matching of snap-fit ​​parameters for split lens barrels has not been fundamentally solved. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide an optical imaging lens that optimizes the structural relationship between the lens barrel and the front lens, improves the fastening design and internal stress distribution, effectively disperses local assembly stress and improves fastening accuracy and stability while ensuring optical performance.

[0005] To achieve the above-mentioned objective, the present invention provides an optical imaging lens, comprising a first lens barrel and a second lens barrel arranged sequentially along the optical axis from the object side to the image side;

[0006] The first lens barrel contains a first lens group, which includes a first lens with positive optical power, and both the object side and the image side of the first lens are concave.

[0007] The second lens barrel contains a second lens group and a plurality of spacer elements. The second lens group includes, in sequence along the optical axis from the object side to the image side, a second lens with positive optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with optical power, a sixth lens with positive optical power, a seventh lens with optical power, and an eighth lens with negative optical power.

[0008] The second lens has a convex object-side surface and a concave image-side surface; the sixth lens has a convex image-side surface; the seventh lens has a convex object-side surface and a concave image-side surface; and the eighth lens has a concave image-side surface.

[0009] The plurality of spacers includes: a second spacer located between the second lens and the third lens, wherein the object side of the second spacer is in at least partial contact with the image side of the second lens;

[0010] The optical imaging lens satisfies: 1.59 ≤ ΔL / T12 < 2.20;

[0011] 1.15<L1 / (D01m-D02s)≤2.50;

[0012] 2.20 < EL22 / CT2 < 2.90;

[0013] Wherein, ΔL is the distance along the optical axis from the object side of the second lens barrel to the image side of the first lens barrel, T12 is the air gap between the first lens and the second lens on the optical axis, L1 is the maximum height of the first lens barrel, D01m is the outer diameter of the image side of the first lens barrel, D02s is the outer diameter of the object side of the second lens barrel, EL22 is the distance along the optical axis from the object side of the second lens barrel to the object side of the second spacer element, and CT2 is the center thickness of the second lens.

[0014] According to one technical solution of the present invention, the plurality of spacer elements further includes: a third spacer element located between the third lens and the fourth lens, wherein the object side of the third spacer element is at least partially in contact with the image side of the third lens;

[0015] The optical imaging lens satisfies: 0.95 < T23 / (CT2+CT3) < 1.85; 3.24 ≤ f23 / EL23 ≤ 6.43;

[0016] Wherein, T23 is the air gap between the second lens and the third lens on the optical axis, CT2 is the center thickness of the second lens, f23 is the combined focal length of the second lens and the third lens, and EL23 is the distance along the optical axis from the object side of the second lens barrel to the object side of the third spacer element.

[0017] According to one technical solution of the present invention, the plurality of spacer elements further includes: a third spacer element located between the third lens and the fourth lens, wherein the object side of the third spacer element is at least partially in contact with the image side of the third lens;

[0018] The optical imaging lens satisfies: 1.24≤EP23 / (d3s-d2m)≤1.87;

[0019] Wherein, EP23 is the distance along the optical axis from the image side of the second spacer to the object side of the third spacer, d3s is the inner diameter of the object side of the third spacer, and d2m is the inner diameter of the image side of the second spacer.

[0020] According to one technical solution of the present invention, the plurality of spacers further includes: a third spacer, located between the third lens and the fourth lens, wherein the object side of the third spacer is in at least partial 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 at least partial contact with the image side of the fourth lens.

[0021] The optical imaging lens satisfies: 0.20 < EP34 / (D4s-D3s) < 1.80;

[0022] 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, D4s is the outer diameter of the object side of the fourth spacer, and D3s is the outer diameter of the object side of the third spacer.

[0023] According to one technical solution of the present invention, the plurality of spacers further includes: a third spacer, located between the third lens and the fourth lens, wherein the object side of the third spacer is in at least partial 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 at least partial contact with the image side of the fourth lens.

[0024] The optical imaging lens satisfies: -2.61≤EP34 / SAG42<-1.00;

[0025] Wherein, 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, and SAG42 is the axial displacement from the intersection of the image side of the fourth lens and the optical axis to the vertex of the optical effective radius of the image side of the fourth lens.

[0026] According to one technical solution of the present invention, the plurality of spacer elements further includes: a fourth spacer element, located between the fourth lens and the fifth lens, wherein the object side of the fourth spacer element is at least partially in contact with the image side of the fourth lens;

[0027] The optical imaging lens satisfies: 21.55 ≤ d4s / T45 < 23.65;

[0028] Wherein, d4s is the inner diameter of the object side of the fourth spacer element, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0029] According to one technical solution of the present invention, the plurality of spacers further includes: a sixth spacer and at least one sixth auxiliary spacer, wherein the sixth spacer is located between the sixth lens and the seventh lens, and its object side is at least partially in contact with the image side of the sixth lens, and the sixth auxiliary spacer is located between the sixth spacer and the seventh lens;

[0030] The optical imaging lens satisfies: 0.53≤T67 / ∑SP6≤1.65;

[0031] Wherein, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, and ∑SP6 is the sum of the maximum thickness of the sixth spacer element and all the sixth auxiliary spacers.

[0032] According to one technical solution of the present invention, the plurality of spacers further includes: a sixth spacer and at least one sixth auxiliary spacer, the sixth spacer being located between the sixth lens and the seventh lens, and its object side being at least partially in contact with the image side of the sixth lens; the sixth auxiliary spacer being located between the sixth spacer and the seventh lens; and a seventh spacer being located between the seventh lens and the eighth lens, the object side of the seventh spacer being at least partially in contact with the image side of the seventh lens.

[0033] The optical imaging lens satisfies: 0.95 < EP67 / (T67+CT7) < 1.55;

[0034] Wherein, 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, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, and CT7 is the center thickness of the seventh lens.

[0035] According to one technical solution of the present invention, the plurality of spacers further includes: a sixth spacer, located between the sixth lens and the seventh lens, wherein the object side of the sixth spacer is in at least partial contact with the image side of the sixth lens;

[0036] The optical imaging lens satisfies: -1.56≤(D6s-d6s) / R12≤-0.45;

[0037] Wherein, D6s is the outer diameter of the object side of the sixth spacer element, d6s is the inner diameter of the object side of the sixth spacer element, and R12 is the radius of curvature of the image side of the sixth lens.

[0038] According to one technical solution of the present invention, the plurality of spacer elements further includes: a seventh spacer element located between the seventh lens and the eighth lens, wherein the object side of the seventh spacer element is at least partially in contact with the image side of the seventh lens;

[0039] The optical imaging lens satisfies: 1.04≤d7s / R14≤3.17;

[0040] Wherein, d7s is the inner diameter of the object side of the seventh spacer element, and R14 is the radius of curvature of the image side of the seventh lens.

[0041] According to one technical solution of the present invention, the plurality of spacer elements further 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 at least partially in contact with the image-side surface of the third lens; a fourth spacer element located between the fourth lens and the fifth lens, wherein the object-side surface of the fourth spacer element is at least partially in contact with the image-side surface of the fourth lens; a fifth spacer element located between the fifth lens and the sixth lens, wherein the object-side surface of the fifth spacer element is at least partially in contact with the image-side surface of the fifth lens; a sixth spacer element and at least one sixth auxiliary spacer element, wherein the sixth spacer element... A sixth auxiliary spacer is located between the sixth lens and the seventh lens, with its object side at least partially contacting the image side of the sixth lens; a seventh spacer, or a seventh spacer and a seventh auxiliary spacer, wherein the seventh spacer is located between the seventh lens and the eighth lens, with its object side at least partially contacting the image side of the seventh lens, and the seventh auxiliary spacer is located between the seventh spacer and the eighth lens; and an eighth spacer is located on the image side of the eighth lens, with its object side at least partially contacting the image side of the eighth lens.

[0042] The optical imaging lens satisfies: 2.45≤L2 / ∑CP≤4.12;

[0043] Where L2 is the maximum height of the second lens barrel, and ∑CP is the sum of the maximum thicknesses of all spacer elements and their auxiliary spacer elements.

[0044] According to one technical solution of the present invention, the optical imaging lens satisfies: 2.35mm < L*tan(HFOV) ≤ 3.00mm;

[0045] Where L is the distance along the optical axis from the object side of the first lens barrel to the image side of the second lens barrel, and HFOV is half of the maximum field of view of the optical imaging lens.

[0046] According to one technical solution of the present invention, the optical imaging lens satisfies: 0.95 < (D02s - d02s) / R3 < 1.40;

[0047] Wherein, D02s is the outer diameter of the object side surface of the second lens barrel, d02s is the inner diameter of the object side surface of the second lens barrel, and R3 is the radius of curvature of the object side surface of the second lens.

[0048] According to one technical solution of the present invention, the optical imaging lens satisfies: 1.95≤f² / d²m≤3.95;

[0049] Where f2 is the effective focal length of the second lens, and d2m is the inner diameter of the image side of the second spacer element.

[0050] According to one technical solution of the present invention, the optical imaging lens satisfies: 2.20 < (D2s - d2s) / T23 ≤ 3.88;

[0051] Wherein, D2s is the outer diameter of the object side of the second spacer element, d2s is the inner diameter of the object side of the second spacer element, and T23 is the air gap between the second lens and the third lens on the optical axis.

[0052] According to one technical solution of the present invention, the optical imaging lens satisfies: 2.50≤L2 / Tr5r12≤3.21;

[0053] Wherein, L2 is the maximum height of the second lens barrel, and Tr5r12 is the distance on the optical axis from the object side of the third lens to the image side of the sixth lens.

[0054] The beneficial effects of this invention are:

[0055] The optical imaging lens of this application uses a first lens barrel and a second lens barrel that are interlocked. This can easily lead to interference fits between the lens barrels and between the lens barrel and the lens structure, resulting in local stress concentration. Therefore, by simultaneously limiting the ratios of ΔL / T12, L1 / (D01m-D02s) and EL22 / CT2, structural deformation or cracking caused by compression at the interlocking parts of the first and second lens barrels is reduced, ensuring uniform stress distribution in the lens and improving image quality. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below.

[0057] Figure 1 A structural layout diagram and schematic diagram of some parameters of an optical imaging lens according to the present invention are shown;

[0058] Figure 2A , Figure 2B A schematic diagram of the structure of two optical imaging lenses according to Embodiment 1 of this application is shown;

[0059] Figure 2C , Figure 2D , Figure 2E The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 1 of this application are shown respectively.

[0060] Figure 3A , Figure 3B The diagram shows two optical imaging lenses according to Embodiment 2 of this application;

[0061] Figure 3C , Figure 3D , Figure 3E The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 2 of this application are shown respectively.

[0062] Figure 4A , Figure 4B The diagram shows two optical imaging lenses according to Embodiment 3 of this application;

[0063] Figure 4C , Figure 4D , Figure 4E The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 3 of this application are shown respectively.

[0064] Figure 5A , Figure 5B The diagram shows two optical imaging lenses according to Embodiment 4 of this application;

[0065] Figure 5C , Figure 5D , Figure 5E The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens according to Embodiment 4 of this application are shown respectively.

[0066] Figure 6 The stress analysis diagram of the optical imaging lens of Scheme 1 of the present invention is shown when ΔL / T12=1.82, L1 / (D01m-D02s)=1.68, and EL22 / CT2=2.23 are satisfied.

[0067] Figure 7 The stress analysis diagram of the optical imaging lens of Scheme 2 of the present invention is shown when ΔL / T12=1.82, L1 / (D01m-D02s)=1.17, and EL22 / CT2=2.87 are satisfied.

[0068] Figure 8The stress analysis diagram of the optical imaging lens of Comparative Example 1 is shown when ΔL / T12=1.82, L1 / (D01m-D02s)=2.80, and EL22 / CT2=2.98.

[0069] Figure 9 The stress analysis diagram of the optical imaging lens of Comparative Example 2 is shown when ΔL / T12=1.82, L1 / (D01m-D02s)=1.03, and EL22 / CT2=2.14 is met. Detailed Implementation

[0070] 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.

[0071] 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, or the first lens may also be referred to as the first lens element.

[0072] 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.

[0073] 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 image 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.

[0074] In this application, the object side refers to the side of the optical imaging lens facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical imaging lens facing the imaging plane. hereinafter, the object side of a lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of a lens refers to the surface of the lens facing the imaging plane. The object side of a lens barrel refers to the surface of the lens barrel facing the object being photographed (not shown in the figure), and the image side of the lens barrel refers to the surface of the lens barrel facing the imaging plane.

[0075] 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 the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense, unless expressly so specified herein.

[0076] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.

[0077] To address the problem in existing eight-element optical imaging lenses where insufficient machining tolerances and fitting precision at the interface between the first and second lens barrels during assembly can easily lead to localized stress concentration, causing lens deformation under pressure, deviation of air gap from design values, and consequently increased aberrations such as astigmatism and field curvature, resulting in decreased image quality, this invention provides an optical imaging lens.

[0078] like Figure 1 As shown, the optical imaging lens of an exemplary embodiment of the present invention includes a first lens barrel and a second lens barrel arranged sequentially from the object side to the image side along the optical axis;

[0079] The first lens barrel contains a first lens group, which includes a first lens with positive optical power. Both the object side and the image side of the first lens are concave.

[0080] The second lens barrel contains a second lens group and multiple spacer elements. The second lens group includes, in sequence along the optical axis from the object side to the image side, a second lens with positive optical power, a third lens with optical power, a fourth lens with positive optical power, a fifth lens with optical power, a sixth lens with positive optical power, a seventh lens with optical power, and an eighth lens with negative optical power. Each lens is independent of the others, and there is an air gap between each lens on the optical axis.

[0081] The object-side surface of the second lens is convex, and the image-side surface is concave; the image-side surface of the sixth lens is convex; the object-side surface of the seventh lens is convex, and the image-side surface is concave; the image-side surface of the eighth lens is concave.

[0082] The lenses in the optical imaging lens are combined with positive and negative power imaging lenses to flexibly control the convergence and divergence of light, so that the light is accurately projected onto the imaging surface (such as the sensor), which helps to miniaturize the device and overcome the bottleneck of large size and portability caused by the complex optical structure of traditional lenses.

[0083] The plurality of spacer elements includes: a second spacer element located between the second lens and the third lens, wherein the object-side surface of the second spacer element is at least partially in contact with the image-side surface of the second lens; a third spacer element located between the third lens and the fourth lens, wherein the object-side surface of the third spacer element is at least partially in contact with the image-side surface of the third lens; a fourth spacer element located between the fourth lens and the fifth lens, wherein the object-side surface of the fourth spacer element is at least partially in contact with the image-side surface of the fourth lens; a fifth spacer element located between the fifth lens and the sixth lens, wherein the object-side surface of the fifth spacer element is at least partially in contact with the image-side surface of the fifth lens; and a sixth spacer element. The system includes an element and at least one sixth auxiliary spacer element, the sixth spacer element being located between the sixth lens and the seventh lens, and its object side being at least partially in contact with the image side of the sixth lens; the sixth auxiliary spacer element being located between the sixth spacer element and the seventh lens; a seventh spacer element and a seventh auxiliary spacer element, the seventh spacer element being located between the seventh lens and the eighth lens, and its object side being at least partially in contact with the image side of the seventh lens; the seventh auxiliary spacer element being located between the seventh spacer element and the eighth lens; and an eighth spacer element being located on the image side of the eighth lens, and the object side of the eighth spacer element being at least partially in contact with the image side of the eighth lens.

[0084] In some embodiments of the present invention, the optical imaging lens may further include color filters and / or protective glass.

[0085] According to one aspect of the present invention, an optical imaging lens is provided, which satisfies the following: 1.59≤ΔL / T12<2.20; 1.15<L1 / (D01m-D02s)≤2.50; 2.20<EL22 / CT2<2.90; wherein ΔL is the distance along the optical axis from the object side of the second lens barrel to the image side of the first lens barrel, T12 is the air gap between the first lens and the second lens on the optical axis, L1 is the maximum height of the first lens barrel, D01m is the outer diameter of the image side of the first lens barrel, D02s is the outer diameter of the object side of the second lens barrel, EL22 is the distance along the optical axis from the object side of the second lens barrel to the object side of the second spacer element, and CT2 is the center thickness of the second lens.

[0086] The optical imaging lens of the present invention uses a lens barrel structure in which a first lens barrel and a second lens barrel are interlocked. This can easily lead to interference fit between lens barrels and between lens barrels and lens elements, resulting in localized stress concentration. Therefore, by simultaneously limiting the ratios of ΔL / T12, L1 / (D01m-D02s) and EL22 / CT2, structural deformation or cracking caused by compression at the interlocking parts of the first and second lens barrels is reduced, ensuring uniform stress distribution in the lens and improving image quality.

[0087] If the ratio of L1 / (D01m-D02s) to EL22 / CT2 is too large, it will cause the lens barrel to fit too tightly or the guide to be too long. The lateral extrusion force during assembly will deform the first lens barrel, which will then obliquely extrude the second lens, generating shear stress that will cause cracking. If the second lens support span is too long and it is too thin, it will bend under the action of axial force, and the maximum bending moment will be concentrated at the edge, leading to breakage.

[0088] If the ratio of L1 / (D01m-D02s) to EL22 / CT2 is too small, the lens barrel will fit too loosely, and the assembly will be prone to eccentricity problems. This will easily lead to lateral bending moment and cracking at the fastening part of the first and second lens barrels. In addition, the sum of the edge thickness of the second lens and the top surface thickness of the second lens barrel is small, and stress concentration will cause deformation and cracking of the top surface of the second lens barrel.

[0089] For reference Figures 6 to 9 As shown, Figure 6 The stress analysis diagram of the optical imaging lens of Scheme 1 of the present invention is shown when ΔL / T12=1.82, L1 / (D01m-D02s)=1.68, and EL22 / CT2=2.23 are satisfied. At this time, the stress distribution of the lens is uniform overall and the risk of deformation and cracking is low. Figure 7 The stress analysis diagram of the optical imaging lens of Scheme 2 of the present invention is shown when ΔL / T12=1.82, L1 / (D01m-D02s)=1.17, EL22 / CT2=2.87. At this time, the stress distribution of the lens is uniform overall and the risk of deformation and cracking is low. Figure 8 The stress analysis diagram of the optical imaging lens in Comparative Example 1 is shown when ΔL / T12=1.82, L1 / (D01m-D02s)=2.80, and EL22 / CT2=2.98 are satisfied. At this time, there is stress concentration in the second lens (the darker the color, the greater the stress), and the risk of deformation and fracturing is relatively high. Figure 9 The stress analysis diagram of the optical imaging lens in Comparative Example 2 is shown when ΔL / T12=1.82, L1 / (D01m-D02s)=1.03, and EL22 / CT2=2.14. At this time, there is stress concentration on the object side of the second lens barrel (the darker the color, the greater the stress), and the risk of deformation and cracking is relatively high.

[0090] In some embodiments of the present invention, the optical imaging lens satisfies: 1.24 ≤ EP23 / (d3s-d2m) ≤ 1.87; where 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, d3s is the inner diameter of the object-side surface of the third spacer element, and d2m is the inner diameter of the image-side surface of the second spacer element. Satisfying the above relationship effectively limits stray light from the lens edge, balances spherical aberration and coma, ensures the cross-sectional area transmitted through the second spacer element, ensures the mechanical support strength and thermal expansion compensation capability of adjacent lens groups on the optical axis, and reduces optical axis offset caused by temperature changes or vibration.

[0091] In some embodiments of the present invention, the optical imaging lens satisfies: 0.20 < EP34 / (D4s-D3s) < 1.80; where 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, D4s is the outer diameter of the object side of the fourth spacer element, and D3s is the outer diameter of the object side of the third spacer element. By limiting the matching relationship between the axial spacing between the third and fourth spacers and their outer diameter difference, the overall length of the lens barrel is avoided from increasing due to excessive axial spacing, while also preventing increased manufacturing difficulty or assembly interference caused by excessive outer diameter difference. This ratio range makes the lens barrel both compact and easy to manufacture and assemble.

[0092] In some embodiments of the present invention, the optical imaging lens satisfies: -2.61 ≤ EP34 / SAG42 < -1.00; where EP34 is the distance along the optical axis from the image-side surface of the third spacer element to the object-side surface of the fourth spacer element, and SAG42 is the axial displacement from the intersection of the image-side surface of the fourth lens and the optical axis to the vertex of the optically effective radius of the image-side surface of the fourth lens. When the above relationship is satisfied, the edge and center thickness of the fourth lens can be indirectly controlled, improving molding feasibility, reducing assembly gaps, and thus enhancing the structural stability and reliability of the lens under vibration and thermal shock.

[0093] In some embodiments of the present invention, the optical imaging lens satisfies: 21.55 ≤ d4s / T45 < 23.65; where d4s is the inner diameter of the object-side surface of the fourth spacer element, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis. Satisfying the above relationship ensures that the inner diameter of the fourth spacer element is large enough to provide a wide, unobstructed path for the light beam passing through the fourth lens, preventing the light beam from being cut by the mechanical structure and causing darkening (vignetting) at the image edges, which is particularly beneficial for ensuring the passage of large-angle incident light.

[0094] In some embodiments of the present invention, the optical imaging lens satisfies: 0.53 ≤ T67 / ∑SP6 ≤ 1.65; where T67 is the air gap between the sixth and seventh lenses on the optical axis, and ∑SP6 is the sum of the maximum thicknesses of the sixth spacer element and all sixth auxiliary spacers along the optical axis. Satisfying the above relationship ensures the support stability of the mechanical structure: by constraining the ratio of the air gap to the thickness of the spacer element, sufficient thickness and structural strength are ensured for the sixth spacer element and its auxiliary elements, thereby stably supporting and positioning the sixth lens, preventing it from tilting or shifting during assembly or vibration, and maintaining optical axis alignment.

[0095] In some embodiments of the present invention, the optical imaging lens satisfies: 0.95 < EP67 / (T67 + CT7) < 1.55; where 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, T67 is the air gap between the sixth and seventh lenses on the optical axis, and CT7 is the center thickness of the seventh lens. When the above relationship is satisfied, the axial relative positions of the sixth spacer element, the seventh lens, and the seventh spacer element can be controlled, ensuring that necessary assembly space is maintained between the spacer element and the lens, avoiding mechanical interference, and simultaneously reducing the impact of material expansion differences caused by temperature changes on optical axis alignment, thereby improving assembly yield.

[0096] In some embodiments of the present invention, the optical imaging lens satisfies: -1.56≤(D6s-d6s) / R12≤-0.45; where 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 R12 is the radius of curvature of the image-side surface of the sixth lens. When the above relationship is satisfied, it is known that the image-side surface of the sixth lens is convex. Limiting the ratio of the difference between the inner and outer diameters of the sixth spacer element to the radius of curvature of the image-side surface of the sixth lens ensures the mechanical fit strength between the spacer element and the lens, avoids stress concentration caused by an excessively small inner diameter, provides mechanical support for the middle section of the lens group, and improves mass production stability.

[0097] In some embodiments of the present invention, the optical imaging lens satisfies: 1.04 ≤ d7s / R14 ≤ 3.17; where d7s is the inner diameter of the object-side surface of the seventh spacer element, and R14 is the radius of curvature of the image-side surface of the seventh lens. By constraining the range of the ratio between the inner diameter of the object-side surface of the seventh spacer element and the radius of curvature of the image-side surface of the seventh lens, the refraction path of light in the lens group can be controlled, avoiding light distortion caused by abrupt changes in curvature, and effectively balancing aberrations such as spherical aberration and coma.

[0098] In some embodiments of the present invention, the optical imaging lens satisfies: 2.45≤L2 / ∑CP≤4.12; where L2 is the maximum height of the second lens barrel, and ∑CP is the sum of the maximum thicknesses of all spacer elements and their auxiliary spacer elements along the optical axis. By constraining the ratio of the maximum height of the second lens barrel to the total thickness of the spacer elements, the balance between the mechanical support strength and the spacing between optical elements is ensured, the lens group is rationally arranged, assembly interference caused by excessively thick spacer elements is avoided, and the overall structural strength of the lens barrel is also ensured, avoiding deformation due to excessive thinness.

[0099] In some embodiments of the present invention, the optical imaging lens satisfies: 2.35mm < L*tan(HFOV) ≤ 3.00mm; where L is the distance along the optical axis from the object-side surface of the first lens barrel to the image-side surface of the second lens barrel, and HFOV is half of the maximum field of view of the optical imaging lens. By constraining the relationship between the lens field of view and the total length of the lens barrel, a significant increase in edge aberrations (such as distortion and coma) is avoided due to an excessively large field of view or an excessively small distance between lens barrels, while also helping to maintain a compact lens structure.

[0100] In some embodiments of the present invention, the optical imaging lens satisfies: 0.95 < (D02s - d02s) / R3 < 1.40; where D02s is the outer diameter of the object-side surface of the second lens barrel, d02s is the inner diameter of the object-side surface of the second lens barrel, and R3 is the radius of curvature of the object-side surface of the second lens. When the above relationship is satisfied, the deflection of light passing through the lens front end can be adjusted, and the light-blocking capability of the object-side end of the second lens barrel can be controlled. If the ratio is too small, it means that the lens barrel wall is too thin, which may cause stray light or multiple reflections to enter the imaging area, forming ghosting or glare; while if the ratio is too large, it means that the lens barrel wall is too thick, which may excessively block edge light, resulting in a reduced effective field of view or vignetting.

[0101] In some embodiments of the present invention, the optical imaging lens satisfies: 1.95 ≤ f2 / d2m ≤ 3.95; where f2 is the effective focal length of the second lens, and d2m is the inner diameter of the image-side surface of the second spacer element. When the above relationship is satisfied, stray light can be intercepted by utilizing the aperture of the spacer ring, while the degree of optical path curvature can be effectively adjusted, reducing aberrations such as astigmatism and field curvature, and improving imaging quality.

[0102] In some embodiments of the present invention, the optical imaging lens satisfies: 2.20 < (D2s - d2s) / T23 ≤ 3.88; where D2s is the outer diameter of the object-side surface of the second spacer element, d2s is the inner diameter of the object-side surface of the second spacer element, and T23 is the air gap between the second lens and the third lens on the optical axis. Satisfying the above relationship effectively limits stray light from the lens edges, balances spherical aberration and coma, ensures the cross-sectional area of ​​the second spacer element, ensures the mechanical support strength and thermal expansion compensation capability of adjacent lens groups on the optical axis, and reduces optical axis offset caused by temperature changes or vibration.

[0103] In some embodiments of the present invention, the optical imaging lens satisfies: 2.50≤L2 / Tr5r12≤3.21; where L2 is the maximum height of the second lens barrel, and Tr5r12 is the distance on the optical axis from the object-side surface of the third lens to the image-side surface of the sixth lens. Satisfying the above relationship ensures a compact structure in the middle section of the lens, which is beneficial for lens miniaturization design, while providing sufficient assembly space for the rear section of the lens, facilitating assembly and adjustment.

[0104] According to another aspect of the present invention, the optical imaging lens satisfies: 0.95 < T23 / (CT2+CT3) < 1.85; 3.24 ≤ f23 / EL23 ≤ 6.43; where T23 is the air gap between the second and third lenses on the optical axis, CT2 is the center thickness of the second lens, f23 is the combined focal length of the second and third lenses, and EL23 is the distance along the optical axis from the object side of the second lens barrel to the object side of the third spacer element. In this invention, the air gap between the second and third lenses is relatively large. By controlling the ratio of T23 / (CT2+CT3), a reasonable distribution of the front lenses of the second lens group can be ensured. Since the second lens is a meniscus lens and has positive optical power, light rays converge after passing through the second lens, which may lead to a decrease in optical performance. By limiting the ratio of f23 / EL23, the optical power distribution and air gap of the lens group can be adjusted, effectively correcting aberrations such as spherical aberration and coma, suppressing chromatic aberration, and ensuring superior lens optical performance.

[0105] The optical imaging lens according to the above embodiments of this application can employ multiple lenses, such as the eight lenses mentioned above. By rationally allocating the optical power, surface shape, and arrangement of the spacers of each lens, the range of each lens-lens connection is made more uniform, enhancing the light-gathering ability and improving the imaging quality of the optical imaging lens.

[0106] In some embodiments of the present invention, the lens material in the optical imaging lens provided by the present invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. When the lens material is glass, the low dispersion characteristic of glass itself can effectively correct the geometric chromatic aberration of the optical imaging lens. The optical imaging lens provided by the present invention can adopt an all-plastic lens structure, which not only gives the lens excellent imaging performance but also allows for a more compact lens structure, achieving a good balance between lens miniaturization and high image quality.

[0107] In some embodiments of the present invention, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberrations of optical imaging lenses, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens of the present invention can all be aspherical lenses, which can effectively reduce the aberrations of optical imaging lenses, thereby reducing the number of lenses and the size of the lenses, and achieving lens miniaturization.

[0108] When an aspherical lens is used, the surface shape of each aspherical lens in the optical imaging lens can be defined using, but is not limited to, the following aspherical formula:

[0109] (1)

[0110] In the above formula, The height perpendicular to the optical axis is along the optical axis. The axial distance from the vertex to the surface at the location; This represents the curvature at the vertex of the aspherical surface. The conic coefficient; , , , , , , ... represent the coefficients of higher-order terms of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively.

[0111] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical imaging lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered as equivalent substitutions and are included within the protection scope of the present invention. In addition, it should be noted that in the following Embodiment 1, there are two examples of optical imaging lenses 1001 and 1002; in Embodiment 2, there are two examples of optical imaging lenses 2001 and 2002; in Embodiment 3, there are two examples of optical imaging lenses 3001 and 3002; and in Embodiment 4, there are two examples of optical imaging lenses 4001 and 4002. The structural parameters of the optical imaging lenses in different examples are different, while the optical parameters of the optical imaging lenses in the two examples in the same embodiment are the same, that is, the center thickness of the first lens to the eighth lens, the radius of curvature of the object side and the image side of the lens, the higher-order term coefficients, and the spacing between the lenses are the same.

[0112] Example 1

[0113] The following is for reference Figures 2A to 2E The optical imaging lens 1001 and optical imaging lens 1002 according to Embodiment 1 of this application are described. Figure 2A , Figure 2B Schematic diagrams of the optical imaging lens 1001 and optical imaging lens 1002 according to Embodiment 1 of this application are shown respectively.

[0114] In Embodiment 1, the optical imaging lens includes a first lens barrel P01 and a second lens barrel P02 arranged sequentially along the optical axis from the object side to the image side. The first lens barrel P01 contains a first lens group, which includes one lens. The second lens barrel P02 contains a second lens group and multiple spacer elements, which include seven lenses.

[0115] The first lens group includes a first lens E1; the second lens group, from the object side to the image side, includes, in sequence: 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. Specifically, the first lens E1 has negative optical power, with its object side S1 being concave and its image side S2 being concave. The second lens E2 has positive optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has negative optical power, with its object side S5 being concave and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being convex and its image side S8 being convex. The fifth lens E5 has positive optical power, with its object side S9 being convex and its image side S10 being convex. The sixth lens E6 has positive optical power, with its object side S11 being concave and its image side S12 being convex. The seventh lens, E7, has negative optical power; its object-side surface, S13, is convex, and its image-side surface, S14, is concave. The eighth lens, E8, also has negative optical power; its object-side surface, S15, is concave, and its image-side surface, S16, is concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging plane S19 (S17, S18, S19 are as follows). Figure 2A As shown in the figure (other figures omitted), S17 and S18 are the object side and image side of the protective glass or filter, respectively. OBJ (not shown in the figure) is the object plane, and STO (not shown in the figure) is the aperture, which is set between the second lens E2 and the third lens E3.

[0116] The plurality of spacers includes: a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a sixth auxiliary spacer P6b, a sixth secondary auxiliary spacer P6c, a seventh spacer P7, and an eighth spacer P8. The sixth auxiliary spacer P6b is located between the sixth spacer P6 and the seventh lens E7, and its object-side surface is at least partially in contact with the image-side surface of the sixth spacer P6. The sixth secondary auxiliary spacer P6c is located between the sixth auxiliary spacer P6b and the seventh lens, and its object-side surface is at least partially in contact with the image-side surface of the sixth auxiliary spacer P6b. Furthermore, compared to the optical imaging lens 1001, the optical imaging lens 1002 also includes a seventh auxiliary spacer P7b, which is located between the seventh lens and the eighth lens, and its object-side surface is at least partially in contact with the image-side surface of the seventh spacer P7.

[0117] Table 1 lists the relevant optical parameters of the optical imaging lens in this embodiment, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0118]

[0119] Table 1

[0120] Table 2 lists the higher-order coefficients of each aspherical lens in the optical imaging lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0121]

[0122] Table 2

[0123] Figure 2C The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 2D The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2E The distortion curve of the optical imaging lens of Embodiment 1 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 2C to 2E As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0124] Example 2

[0125] The following is for reference Figures 3A to 3E The optical imaging lens 2001 and optical imaging lens 2002 according to Embodiment 2 of this application are described. Figure 3A , Figure 3B Schematic diagrams of the optical imaging lens 2001 and optical imaging lens 2002 according to Embodiment 2 of this application are shown respectively.

[0126] In Embodiment 2, the optical imaging lens includes a first lens barrel P01 and a second lens barrel P02 arranged sequentially along the optical axis from the object side to the image side. The first lens barrel P01 houses a first lens group, which includes one lens. The second lens barrel P02 houses a second lens group and multiple spacer elements, which include seven lenses.

[0127] The first lens group includes a first lens E1; the second lens group, from the object side to the image side, includes, in sequence: 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. Specifically, the first lens E1 has negative optical power, with its object side S1 being concave and its image side S2 being concave. The second lens E2 has positive optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being convex. The fourth lens E4 has positive optical power, with its object side S7 being convex and its image side S8 being convex. The fifth lens E5 has negative optical power, with its object side S9 being concave and its image side S10 being convex. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S19. S17 and S18 are the object-side and image-side surfaces of the protective glass or filter, respectively. OBJ is the object surface, and STO is the aperture, which is positioned between the second lens E2 and the third lens E3.

[0128] The plurality of spacers includes: a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a sixth auxiliary spacer P6b, a sixth secondary auxiliary spacer P6c, a seventh spacer P7, and an eighth spacer P8. The sixth auxiliary spacer P6b is located between the sixth lens and the seventh lens, and the object side of the sixth auxiliary spacer P6b is at least partially in contact with the image side of the sixth spacer P6. The sixth secondary auxiliary spacer P6c is located between the sixth lens and the seventh lens, and the object side of the sixth secondary auxiliary spacer P6c is at least partially in contact with the image side of the sixth auxiliary spacer P6b.

[0129] Table 3 lists the relevant optical parameters of the optical imaging lens in this embodiment, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0130]

[0131] Table 3

[0132] Table 4 lists the higher-order coefficients of each aspherical lens in the optical imaging lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20.

[0133]

[0134] Table 4

[0135] Figure 3C The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3D The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 3E The distortion curve of the optical imaging lens in Embodiment 2 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figures 3C to 3E It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0136] Example 3

[0137] The following is for reference Figures 4A to 4E The optical imaging lens 3001 and optical imaging lens 3002 according to Embodiment 3 of this application are described. Figure 4A , Figure 4B Schematic diagrams of the optical imaging lens 3001 and optical imaging lens 3002 according to Embodiment 3 of this application are shown respectively.

[0138] In Embodiment 3, the optical imaging lens includes a first lens barrel P01 and a second lens barrel P02 arranged sequentially along the optical axis from the object side to the image side. The first lens barrel P01 contains a first lens group, which includes one lens. The second lens barrel P02 contains a second lens group and multiple spacer elements, which include seven lenses.

[0139] The first lens group includes a first lens E1; the second lens group, from the object side to the image side, includes, in sequence: 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. Specifically, the first lens E1 has negative optical power, with its object side S1 being concave and its image side S2 being concave. The second lens E2 has positive optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has positive optical power, with its object side S7 being convex and its image side S8 being concave. The fifth lens E5 has negative optical power, with its object side S9 being concave and its image side S10 being concave. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S19. S17 and S18 are the object-side and image-side surfaces of the protective glass or filter, respectively. OBJ is the object surface, and STO is the aperture, which is positioned between the second lens E2 and the third lens E3.

[0140] The plurality of spacers include: a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a sixth auxiliary spacer P6b, a seventh spacer P7, and an eighth spacer P8, wherein the sixth auxiliary spacer P6b is located between the sixth lens and the seventh lens, and the object side of the sixth auxiliary spacer P6b is at least partially in contact with the image side of the sixth spacer P6.

[0141] Table 5 lists the relevant optical parameters of the optical imaging lens in this embodiment, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0142]

[0143] Table 5

[0144] Table 6 lists the higher-order coefficients of each aspherical lens in the optical imaging lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0145]

[0146] Table 6

[0147] Figure 4C The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 4D The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4E The distortion curve of the optical imaging lens in Embodiment 3 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figures 4C to 4E It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0148] Example 4

[0149] The following is for reference Figures 5A to 5E The optical imaging lens 4001 and optical imaging lens 4002 according to Embodiment 4 of this application are described. Figure 5A , Figure 5B Schematic diagrams of the optical imaging lens 4001 and optical imaging lens 4002 according to Embodiment 4 of this application are shown respectively.

[0150] In Embodiment 4, the optical imaging lens includes a first lens barrel P01 and a second lens barrel P02 arranged sequentially along the optical axis from the object side to the image side. The first lens barrel P01 contains a first lens group, which includes one lens. The second lens barrel P02 contains a second lens group and multiple spacer elements, which include seven lenses.

[0151] The first lens group includes a first lens E1; the second lens group, from the object side to the image side, includes, in sequence: 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. Specifically, the first lens E1 has negative optical power, with its object side S1 being concave and its image side S2 being concave. The second lens E2 has positive optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being convex. The fourth lens E4 has positive optical power, with its object side S7 being concave and its image side S8 being convex. The fifth lens E5 has negative optical power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has positive optical power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S19. S17 and S18 are the two surfaces of the protective glass or filter, OBJ is the object surface, and STO is the aperture, which is positioned between the second lens E2 and the third lens E3.

[0152] The plurality of spacers includes: a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, a sixth auxiliary spacer P6b, a sixth secondary auxiliary spacer P6c, a seventh spacer P7, and an eighth spacer P8. The sixth auxiliary spacer P6b is located between the sixth lens and the seventh lens, and the object side of the sixth auxiliary spacer P6b is at least partially in contact with the image side of the sixth spacer P6. The sixth secondary auxiliary spacer P6c is located between the sixth lens and the seventh lens, and the object side of the sixth secondary auxiliary spacer P6c is at least partially in contact with the image side of the sixth auxiliary spacer P6b.

[0153] Table 7 lists the relevant optical parameters of the optical imaging lens in this embodiment, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0154]

[0155] Table 7

[0156] Table 8 lists the higher-order coefficients of each aspherical lens in the optical imaging lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 and A 20 .

[0157]

[0158] Table 8

[0159] Figure 5C The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5D The astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5E The distortion curve of the optical imaging lens in Embodiment 4 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 5C to 5E It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0160] In summary, the optical parameters of the optical imaging lenses 1001, 1002, 2001, 2002, 3001, 3002, 4001 and 4002 in Examples 1 to 4 are shown in Table 9 below.

[0161]

[0162] Table 9

[0163] The structural parameters of the optical imaging lenses 1001, 1002, 2001, 2002, 3001, 3002, 4001 and 4002 in Examples 1 to 4 are shown in Table 10 below, in millimeters (mm).

[0164]

[0165] Table 10

[0166] The optical imaging lenses 1001, 1002, 2001, 2002, 3001, 3002, 4001 and 4002 in Examples 1 to 4 satisfy the relationship shown in Table 11.

[0167]

[0168] Table 11

[0169] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that, The optical imaging lens comprises a first lens barrel and a second lens barrel arranged in sequence from the object side to the image side along the optical axis; The first lens barrel contains a first lens group, and the first lens group comprises a first lens with negative refractive power, and both the object side surface and the image side surface of the first lens are concave surfaces; The second lens barrel contains a second lens group and a plurality of spacer elements, and the second lens group comprises, in sequence from the object side to the image side along the optical axis, a second lens with positive refractive power, a third lens with refractive power, a fourth lens with positive refractive power, a fifth lens with refractive power, a sixth lens with positive refractive power, a seventh lens with refractive power, and an eighth lens with negative refractive power; The optical imaging lens comprises eight lenses with refractive power; The object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, the image side surface of the sixth lens is a convex surface, the object side surface of the seventh lens is a convex surface, the image side surface of the seventh lens is a concave surface, and the image side surface of the eighth lens is a concave surface; The plurality of spacer elements comprise a second spacer element located between the second lens and the third lens, and the object side surface of the second spacer element is at least partially in contact with the image side surface of the second lens; The optical imaging lens satisfies 1.59≤ΔL / T12<2.20; 1.15 2.20 2.20 2.The optical imaging lens according to claim 1, wherein, 1.59≤ΔL / T12<2.20, 1.15 1.15 1.15 3.The optical imaging lens according to claim 1, wherein, 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1 Wherein, EP23 is a distance from an image side surface of the second spacer element to an object side surface of the third spacer element along an optical axis direction, d3s is an inner diameter of the object side surface of the third spacer element, and d2m is an inner diameter of the image side surface of the second spacer element. 4.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprises: a third spacer element located between the third lens and the fourth lens, and an object side surface of the third spacer element at least partially contacts an image side surface of the third lens; and a fourth spacer element located between the fourth lens and the fifth lens, and an object side surface of the fourth spacer element at least partially contacts an image side surface of the fourth lens. The optical imaging lens satisfies: 0.20 < EP34 / (D4s-D3s) < 1.

80. Wherein, EP34 is a distance from an image side surface of the third spacer element to an object side surface of the fourth spacer element along an optical axis direction, D4s is an outer diameter of the object side surface of the fourth spacer element, and D3s is an outer diameter of the object side surface of the third spacer element.

5. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements further comprises: a third spacer element located between the third lens and the fourth lens, and an object side surface of the third spacer element at least partially contacts an image side surface of the third lens; and a fourth spacer element located between the fourth lens and the fifth lens, and an object side surface of the fourth spacer element at least partially contacts an image side surface of the fourth lens. The optical imaging lens satisfies: -2.61 ≤ EP34 / SAG42 < -1.

00. Wherein, EP34 is a distance from an image side surface of the third spacer element to an object side surface of the fourth spacer element along an optical axis direction, and SAG42 is an axial displacement from an intersection of an image side surface of the fourth lens and an optical axis to an optical effective radius vertex of the image side surface of the fourth lens. 6.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprises: a fourth spacer element located between the fourth lens and the fifth lens, and an object side surface of the fourth spacer element at least partially contacts an image side surface of the fourth lens. The optical imaging lens satisfies: 21.55 ≤ d4s / T45 < 23.

65. Wherein, d4s is an inner diameter of the object side surface of the fourth spacer element, and T45 is an air gap of the fourth lens and the fifth lens along the optical axis. 7.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprises: a sixth spacer element located between the sixth lens and the seventh lens, and an object side surface of the sixth spacer element at least partially contacts an image side surface of the sixth lens; and at least one sixth auxiliary spacer element located between the sixth spacer element and the seventh lens. The optical imaging lens satisfies: 0.53 ≤ T67 / ∑SP6 ≤ 1.

65. Wherein, T67 is an air gap of the sixth lens and the seventh lens along the optical axis, and ∑SP6 is a sum of maximum thicknesses of the sixth spacer element and all sixth auxiliary spacer elements along the optical axis. 8.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprises: a sixth spacer element located between the sixth lens and the seventh lens, and a material side of the sixth spacer element at least partially contacts an image side of the sixth lens; and at least one sixth auxiliary spacer element located between the sixth spacer element and the seventh lens; The optical imaging lens satisfies: 0.95 < EP67 / (T67+CT7) < 1.55; Wherein, EP67 is a distance from an image side of the sixth spacer element to a material side of the seventh spacer element along an optical axis direction, T67 is an air gap of the sixth lens and the seventh lens on the optical axis, and CT7 is a center thickness of the seventh lens. 9.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprises: a sixth spacer element located between the sixth lens and the seventh lens, and a material side of the sixth spacer element at least partially contacts an image side of the sixth lens; The optical imaging lens satisfies: -1.56 ≤ (D6s-d6s) / R12 ≤ -0.45; Wherein, D6s is an outer diameter of a material side of the sixth spacer element, d6s is an inner diameter of the material side of the sixth spacer element, and R12 is a curvature radius of an image side of the sixth lens. 10.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprises: a seventh spacer element located between the seventh lens and the eighth lens, and a material side of the seventh spacer element at least partially contacts an image side of the seventh lens; The optical imaging lens satisfies: 1.04 ≤ d7s / R14 ≤ 3.17; Wherein, d7s is an inner diameter of a material side of the seventh spacer element, and R14 is a curvature radius of an image side of the seventh lens. 11.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprises: a third spacer element between the third lens and the fourth lens, and an object side surface of the third spacer element at least partially contacts an image side surface of the third lens; a fourth spacer element between the fourth lens and the fifth lens, and an object side surface of the fourth spacer element at least partially contacts an image side surface of the fourth lens; a fifth spacer element between the fifth lens and the sixth lens, and an object side surface of the fifth spacer element at least partially contacts an image side surface of the fifth lens; a sixth spacer element between the sixth lens and the seventh lens, and an object side surface of the sixth spacer element at least partially contacts an image side surface of the sixth lens; a seventh spacer element between the seventh lens and the eighth lens, and an object side surface of the seventh spacer element at least partially contacts an image side surface of the seventh lens; and an eighth spacer element on an image side of the eighth lens, and an object side surface of the eighth spacer element at least partially contacts an image side surface of the eighth lens. The optical imaging lens satisfies: 2.45≤L2 / ∑CP≤4.12; wherein L2 is a maximum height of the second lens barrel, and ∑CP is a sum of maximum thicknesses of all spacer elements and their auxiliary spacer elements along an optical axis.

12. The optical imaging lens according to any of claims 1-11, wherein, The optical imaging lens satisfies: 2.35mm<L*tan(HFOV)≤3.00mm; wherein L is a distance from an object side surface of the first lens barrel to an image side surface of the second lens barrel along an optical axis, and HFOV is a half of a maximum field of view angle of the optical imaging lens.

13. The optical imaging lens according to any of claims 1-11, wherein, The optical imaging lens satisfies: 0.95<(D02s-d02s) / R3<1.40; wherein D02s is an outer diameter of the object side surface of the second lens barrel, d02s is an inner diameter of the object side surface of the second lens barrel, and R3 is a radius of curvature of the object side surface of the second lens.

14. The optical imaging lens according to any of claims 1-11, wherein, The optical imaging lens satisfies: 1.95≤f2 / d2m≤3.95; wherein f2 is an effective focal length of the second lens, and d2m is an inner diameter of an image side surface of the second spacer element.

15. The optical imaging lens according to any of claims 1-11, wherein, The optical imaging lens satisfies: 2.20<(D2s-d2s) / T23≤3.88; wherein D2s is an outer diameter of the object side surface of the second spacer element, d2s is an inner diameter of the object side surface of the second spacer element, and T23 is an air separation between the second lens and the third lens along an optical axis.

16. The optical imaging lens according to any of claims 1-11, wherein, The optical imaging lens satisfies: 2.50≤L2 / Tr5r12≤3.21; wherein L2 is a maximum height of the second lens barrel, and Tr5r12 is a distance from an object side surface of the third lens to an image side surface of the sixth lens along an optical axis.

Images