Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises a lens barrel, an imaging lens group and a spacer element group arranged in the lens barrel; the imaging lens group comprises first, second, third, fourth, fifth, sixth, seventh and eighth lenses arranged in sequence from the object side to the image side along the optical axis, the first, fourth and seventh lenses have positive refractive powers, and the third, fifth, sixth and eighth lenses have negative refractive powers; the spacer element group comprises sixth and seventh spacer elements, the sixth spacer element is arranged on the image side of the sixth lens and in contact with the image side of the sixth lens, and the seventh spacer element is arranged on the image side of the seventh lens and in contact with the image side of the seventh lens; wherein the optical imaging lens has eight lenses with refractive powers; the interval distance T67 of the sixth lens and the seventh lens on the optical axis and the distance EP67 of the sixth and seventh spacer elements along the optical axis satisfy 10.3 < EP67 / T67 < 34.8; and the curvature radius R12 of the image side of the sixth lens and the outer diameter D6s of the object side of the sixth spacer element satisfy 0.8 < R12 / D6s < 1.95.

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to an optical imaging lens. Background Art

[0002] In recent years, with the increasing changes in consumer demands, the requirements for optical imaging lenses have gradually become more complex and diverse. In different application scenarios, the performance of optical imaging lenses is not the same.

[0003] Eight-piece optical imaging lenses have become the mainstream and are widely used in fields such as mobile phones, virtual reality technology, augmented reality technology, and machine vision technology. The rear lenses have a greater impact on the overall imaging of eight-piece optical imaging lenses. For example, the sixth lens and the seventh lens are more sensitive. When the sixth lens, the seventh lens, and the adjacent spacer elements are not set reasonably, the assembly stability of the optical imaging lens will become poor, thus affecting the imaging quality of the optical imaging lens. Summary of the Invention

[0004] One aspect of this application provides such an optical imaging lens, which includes a lens barrel and an imaging lens group and a spacer element group disposed within the lens barrel. The imaging lens group includes a first lens with a positive optical power, a second lens with a positive or negative optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, a sixth lens with a negative optical power, a seventh lens with a positive optical power, and an eighth lens with a negative optical power arranged in sequence from the object side to the image side along the optical axis. The spacer element group includes a sixth spacer element and a seventh spacer element. The sixth spacer element is disposed on the image side of the sixth lens and contacts the image side of the sixth lens. The seventh spacer element is disposed on the image side of the seventh lens and contacts the image side of the seventh lens. The number of lenses with optical power in the optical imaging lens is eight. The distance T67 between the sixth lens and the seventh lens on the optical axis and the distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis satisfy: 10.3 < EP67 / T67 < 34.8. The radius of curvature R12 of the image side of the sixth lens and the outer diameter D6s of the object side of the sixth spacer element satisfy: 0.8 < R12 / D6s < 1.95.

[0005] According to an exemplary embodiment of this application, the radius of curvature R15 of the object side of the eighth lens and the outer diameter D7m of the image side of the seventh spacer element satisfy: 0.4 ≤ R15 / D7m ≤ 0.7.

[0006] According to an exemplary embodiment of this application, the axial distance SAG72 between the intersection of the image-side surface of the seventh lens and the optical axis to the vertex of the effective radius of the image-side surface of the seventh lens, the axial distance SAG82 between the intersection of the image-side surface of the eighth lens and the optical axis to the vertex of the effective radius of the image-side surface of the eighth lens, and the maximum thickness CP7 of the seventh spacer element satisfy: 0.7 < (|SAG82| + |SAG72|) / CP7 ≤ 1.2.

[0007] According to an exemplary embodiment of this application, the radius of curvature R14 of the image-side surface of the seventh lens and the outer diameter D7s of the object-side surface of the seventh spacer element satisfy: 1.7 <R14 / D7s<3.1。

[0008] According to an exemplary embodiment of this application, the outer diameter D0s of the object-side end face of the lens barrel, the outer diameter D0m of the image-side end face of the lens barrel, and half the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens satisfy the following condition: 0.7 < (D0m - D0s) / ImgH < 1.25.

[0009] According to an exemplary embodiment of this application, the sum of the length L of the lens barrel along the optical axis and the distance ∑AT between any two adjacent lenses from the first to the eighth lens on the optical axis satisfies: 2.7 <L / ∑AT<3.3。

[0010] According to an exemplary embodiment of this application, the spacer element group further includes a first spacer element, which is disposed on and in contact with the image-side surface of the first lens. The effective focal length f1 of the first lens and the inner diameter d1s of the object-side surface of the first spacer element satisfy: 1.35 <f1 / d1s≤1.6。

[0011] According to an exemplary embodiment of this application, the spacer element group further includes a first spacer element and a second spacer element. The first spacer element is disposed on and in contact with the image-side surface of the first lens, and the second spacer element is disposed on and in contact with the image-side surface of the second lens. The spacing distance T12 between the first and second lenses on the optical axis, the spacing distance T23 between the second and third lenses on the optical axis, and the distance EP12 between the first and second spacer elements along the optical axis satisfy: 3.05 <EP12 / (T12+T23)<4.8。

[0012] According to an exemplary embodiment of this application, the spacer element group further includes a second spacer element, which is disposed on and in contact with the image-side surface of the second lens. The radius of curvature R4 of the image-side surface of the second lens, the refractive index N2 of the second lens, and the outer diameter D2s of the object-side surface of the second spacer element satisfy: 1.5 <R4×N2 / D2s<2.5。

[0013] According to an exemplary embodiment of this application, the spacer element group further includes a second spacer element and a third spacer element. The second spacer element is disposed on and in contact with the image-side surface of the second lens, and the third spacer element is disposed on and in contact with the image-side surface of the third lens. The distance EP23 between the second and third spacer elements along the optical axis, the center thickness CT2 of the second lens along the optical axis, and the center thickness CT3 of the third lens along the optical axis satisfy: 1.0 <EP23 / (CT2+CT3)<1.2。

[0014] According to an exemplary embodiment of this application, the spacer element group further includes a third spacer element, which is disposed on and in contact with the image-side surface of the third lens. The radius of curvature R6 of the image-side surface of the third lens, the refractive index N3 of the third lens, and the outer diameter D3s of the object-side surface of the third spacer element satisfy: 0.75 <R6×N3 / D3s<1.05。

[0015] According to an exemplary embodiment of this application, the spacer element group further includes a third spacer element and a fourth spacer element. The third spacer element is disposed on and in contact with the image-side surface of the third lens, and the fourth spacer element is disposed on and in contact with the image-side surface of the fourth lens. The spacing T34 between the third and fourth lenses on the optical axis, the distance EP34 between the third and fourth spacer elements along the optical axis, and the maximum thickness CP4 of the fourth spacer element satisfy: 1.1 <T34 / (EP34+CP4)<1.5。

[0016] According to an exemplary embodiment of this application, the spacer element group further includes a fourth spacer element, which is disposed on and in contact with the image-side surface of the fourth lens. The radius of curvature R9 of the object-side surface of the fifth lens, the inner diameter d4m of the image-side surface of the fourth spacer element, and the outer diameter D4m of the image-side surface of the fourth spacer element satisfy: -14.05 <R9 / (D4m-d4m)<-4.6。

[0017] According to an exemplary embodiment of this application, the spacer element group further includes a fourth spacer element and a fifth spacer element. The fourth spacer element is disposed on and in contact with the image-side surface of the fourth lens, and the fifth spacer element is disposed on and in contact with the image-side surface of the fifth lens. The distance EP45 between the fourth and fifth spacer elements along the optical axis satisfies 1.5 with the center thickness CT5 of the fifth lens along the optical axis. <EP45 / CT5<2.15。

[0018] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, which is placed on the image side of the fifth lens and contacts the image side of the fifth lens. Among them, the radius of curvature R10 of the image side of the fifth lens and the outer diameter D5s of the object side of the fifth spacer element satisfy: -11.4 < R10 / D5s < -5.1.

[0019] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, which is placed on the image side of the fifth lens and contacts the image side of the fifth lens. Among them, the radius of curvature R11 of the object side of the sixth lens and the outer diameter D5m of the image side of the fifth spacer element satisfy: -1.35 < R11 / D5m < -0.9.

[0020] According to an exemplary embodiment of the present application, the object side of the first lens is convex, and the image side is concave. The object side of the second lens is convex, and the image side is concave. The object side of the third lens is convex, and the image side is concave. The object side of the fourth lens is convex, and the image side is convex. The object side of the fifth lens is concave, and the image side is convex. The object side of the sixth lens is concave, and the image side is concave. The object side of the seventh lens is convex, and the image side is concave. The object side of the eighth lens is convex, and the image side is concave.

[0021] The optical imaging lens provided by the present application uses eight lenses, and the optical imaging lens satisfies "0.8 < R12 / D6s < 1.95", which can constrain the shape of the sixth lens and the light trend, so that the sixth lens diverges the light to meet the requirements of a large image surface. However, at the same time, it will increase the risk of unstable assembly. Therefore, by controlling EP67 / T67 within the range of 10.3 to 34.8, a reasonable assembly gap can be obtained between the sixth lens and the seventh lens, reducing the structural sensitivity and optical sensitivity of the optical imaging lens, thereby reducing the comprehensive sensitivity of the optical imaging lens and improving the assembly stability of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings. Among them:

[0023] Figure 1A and Figure 1B respectively show the parameter marking diagrams of the optical imaging lens according to the embodiments of the present application;

[0024] Figure 2 shows the structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application;

[0025] Figure 3 shows the structural schematic diagram of the optical imaging lens according to Embodiment 2 of the present application;

[0026] Figure 4A , Figure 4B , Figure 4C , Figure 4D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 1 or 2 of this application are shown respectively.

[0027] Figure 5 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown;

[0028] Figure 6 A schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application is shown;

[0029] Figure 7A , Figure 7B , Figure 7C , Figure 7D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 3 or 4 of this application are shown respectively.

[0030] Figure 8 A schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of this application is shown;

[0031] Figure 9 A schematic diagram of the structure of an optical imaging lens according to Embodiment 6 of this application is shown;

[0032] Figure 10A , Figure 10B , Figure 10C , Figure 10D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 5 or 6 of this application are shown respectively.

[0033] Figure 11 A schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of this application is shown;

[0034] Figure 12 A schematic diagram of the structure of an optical imaging lens according to Embodiment 8 of this application is shown;

[0035] Figure 13A , Figure 13B , Figure 13C , Figure 13D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 7 or 8 of this application are shown respectively; and

[0036] Figure 14 A schematic diagram showing the center point and edge point of the object side and image side of the lens in an optical imaging lens according to an embodiment of this application is shown. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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 drawn strictly to scale.

[0040] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the image plane is called the image-side surface of the lens.

[0041] The optical imaging lens of the exemplary embodiments of this application can be simulated using software and / or tools such as ZEMAX and CODEV. Optionally, the optical imaging lens can be simulated using CODEV software. During the simulation process using software and / or tools as described above, the surface profile of each lens can be appropriately adjusted according to the built-in surface profile model of the software and / or tool used.

[0042] It should also be understood that the terms "comprising" and / or "having," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0043] 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 formalized sense, unless expressly so specified herein.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] refer to Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 11 and Figure 12 The first aspect of this application provides an optical imaging lens that may include an imaging lens group, which may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object side to the image side. In the first to eighth lenses, any two adjacent lenses may have a gap distance, such as an air gap.

[0046] In an exemplary embodiment, the first lens may have positive optical power. The second lens may have positive or negative optical power. The third lens may have negative optical power. The fourth lens may have positive optical power. The fifth lens may have negative optical power. The sixth lens may have negative optical power. The seventh lens may have positive optical power. The eighth lens may have negative optical power. The optical imaging lens may have eight lenses with optical power.

[0047] In an exemplary embodiment, the object-side surface of the first lens may be convex, and the image-side surface may be concave.

[0048] In an exemplary embodiment, the object-side surface of the second lens may be convex, and the image-side surface may be concave.

[0049] In an exemplary embodiment, the object-side surface of the third lens may be convex, and the image-side surface may be concave.

[0050] In an exemplary embodiment, the object-side surface of the fourth lens may be convex, and the image-side surface may be convex.

[0051] In an exemplary embodiment, the object-side surface of the fifth lens may be concave, and the image-side surface may be convex.

[0052] In an exemplary embodiment, the object-side surface of the sixth lens may be concave, and the image-side surface may be concave.

[0053] In an exemplary embodiment, the object-side surface of the seventh lens may be convex, and the image-side surface may be concave.

[0054] In an exemplary embodiment, the object-side surface of the eighth lens may be convex, and the image-side surface may be concave.

[0055] In an exemplary embodiment, the optical imaging lens may further include an aperture stop. The aperture stop may be disposed between the first lens and the second lens.

[0056] In an exemplary embodiment, the optical imaging lens may further include a group of spacers, which may include one or more of a first spacer, a second spacer, a third spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer. Proper use of spacers can effectively mitigate stray light risks, reduce interference with image quality, and thus improve the imaging quality of the optical imaging lens.

[0057] In an exemplary embodiment, the optical imaging lens may further include a lens barrel, with an imaging lens group and a spacer element group disposed within the lens barrel. The lens barrel may include an object-side end face, an image-side end face, an outer annular surface, and an inner annular surface, wherein the end face of the lens barrel closest to the object side is the object-side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image-side end face of the lens barrel; in a direction perpendicular to the optical axis, the surface of the lens barrel furthest from the optical axis is the outer annular surface, and the surface of the lens barrel closest to the optical axis is the inner annular surface.

[0058] In an exemplary embodiment, the outer peripheral surface of at least one lens in the imaging lens group may have a tangled portion and a non-tangled portion, and the outer diameter of the tangled portion of the lens may be smaller than the outer diameter of the non-tangled portion. When the outer peripheral surface of the lens has a tangled portion, the outer diameter of the lens generally refers to the outer diameter of the non-tangled portion. For example, the outer diameter of the object-side surface of the lens refers to the outer diameter of the portion of the non-tangled portion of the lens closest to the object side, and the outer diameter of the image-side surface of the lens refers to the outer diameter of the portion of the non-tangled portion of the lens closest to the image side.

[0059] In an exemplary embodiment, the outer peripheral surface of at least one spacer in the spacer group may have a truncated portion and a non-truncated portion, and the outer diameter of the truncated portion of the spacer may be smaller than the outer diameter of the non-truncated portion of the spacer. When the outer peripheral surface of the spacer has a truncated portion, the outer diameter of the spacer typically refers to the outer diameter of the non-truncated portion of the spacer. For example, the outer diameter of the object-side surface of the spacer refers to the outer diameter of the portion of the non-truncated portion of the spacer closest to the object side, and the outer diameter of the image-side surface of the spacer refers to the outer diameter of the portion of the non-truncated portion of the spacer closest to the image side.

[0060] In an exemplary embodiment, the spacer element group may include a sixth spacer element and a seventh spacer element. The sixth spacer element may be disposed on the image side of the sixth lens and at least partially contact the image side of the sixth lens. The seventh spacer element may be disposed on the image side of the seventh lens and at least partially contact the image side of the seventh lens. Among them, the interval distance T67 between the sixth lens and the seventh lens on the optical axis and the distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis may satisfy: 10.3 < EP67 / T67 < 34.8; the radius of curvature R12 of the image side of the sixth lens and the outer diameter D6s of the object side of the sixth spacer element may satisfy: 0.8 < R12 / D6s < 1.95. By controlling the optical imaging lens to satisfy "0.8 < R12 / D6s < 1.95", the shape of the sixth lens and the light path can be restricted, so that the sixth lens diverges the light, thus meeting the requirements of a large image plane. However, in this case, the sixth lens is more sensitive, the central position of its object side is far from the central position of the fifth lens, and the edge position of its image side is far from the edge position of the seventh lens, which will increase the risk of unstable assembly. Therefore, reasonably configuring the ratio of the distance between the sixth spacer element and the seventh spacer element along the optical axis to the interval distance between the sixth lens and the seventh lens on the optical axis can make a reasonable assembly gap between the sixth lens and the seventh lens, reduce the structural sensitivity and optical sensitivity of the optical imaging lens, thereby reducing the comprehensive sensitivity of the optical imaging lens and improving the assembly stability of the optical imaging lens. In addition, by controlling the above two ratios, the thickness ratio of the sixth lens can be close to 1, and the thickness ratio of the seventh lens can be close to 1, improving the molding stability of the sixth lens and the seventh lens.

[0061] Table 1 is the structural sensitivity analysis table of the interval distance T67 between the sixth lens and the seventh lens on the optical axis. Table 2 is the optical sensitivity and comprehensive sensitivity analysis table of the interval distance T67 between the sixth lens and the seventh lens on the optical axis. Among them, lens 1 satisfies EP67 / T67 = 16.92, lens 2 satisfies EP67 / T67 = 9.56, and lens 3 satisfies EP67 / T67 = 37.0.

[0062] In Table 1, surface S11 is the object side of the sixth lens, surface S12 is the image side of the sixth lens, surface S13 is the object side of the seventh lens, surface S14 is the image side of the seventh lens, and △SP6 (i.e., the structural sensitivity) is the change amount of the interval distance T67 between the sixth lens and the seventh lens on the optical axis. Under the action of stress, the center points of the object side and the image side of the sixth lens and the seventh lens will shift, resulting in a shift in the interval distance between the sixth lens and the seventh lens on the optical axis. The smaller the absolute value of △SP6, the smaller the deformation amount of the sixth lens and the seventh lens, and the better the structural sensitivity of the interval distance between the sixth lens and the seventh lens on the optical axis. As Figure 14As shown, the center point of the object side of the sixth lens is M61, and the edge point of the object side of the sixth lens is N61; the center point of the image side of the sixth lens is M62, and the edge point of the image side of the sixth lens is N62; the center point of the object side of the seventh lens is M71, and the edge point of the object side of the seventh lens is N71; the center point of the image side of the seventh lens is M72, and the edge point of the image side of the seventh lens is N72.

[0063] In Table 2, the S-direction peak value can be the peak value of the S-curve of the MTF curve at the edge of the field of view (e.g., 0.8 field of view), and the M-direction peak value can be the peak value of the M-curve of the MTF curve at the edge of the field of view (e.g., 0.8 field of view). "S" represents the sagittal curve, and "M" represents the meridional curve. When ΔSP6 changes, the S-direction peak value and / or the M-direction peak value will change accordingly. The amount of change in the S-direction peak value and / or the M-direction peak value can be considered as optical sensitivity. The overall sensitivity can be the product of structural sensitivity and optical sensitivity. It should be understood that the smaller the absolute value of the optical sensitivity, the better the optical sensitivity; the smaller the absolute value of the overall sensitivity, the better the overall sensitivity.

[0064]

[0065] Table 1

[0066]

[0067] Table 2

[0068] Structural sensitivity represents the displacement of the sixth and seventh lenses of a lens when a certain load is applied. When the same load is applied to lenses 1, 2, and 3, the structural portions of lenses 1, 2, and 3 on the image side of the seventh lens (i.e., the non-effective diameter portion) are subjected to the same external force. Under the influence of stress, the centers of the sixth and seventh lenses deform, leading to a change in the spacing between them. For example, referring to Table 1, simulations show that the structural sensitivity of lenses 1, 2, and 3 are -0.44 μm, -5.03 μm, and -4.681 μm, respectively. It is evident that lens 1 has the smallest structural sensitivity, meaning a smaller displacement, and is therefore superior in structural sensitivity.

[0069] Optical sensitivity represents the change in the peak value of the MTF of the marginal field of view of the lens when the displacement of the lens is constant. The displacements of Lens 1, Lens 2, and Lens 3 are the same. For example, referring to Table 2, through simulation, when △SP6 increases by 1um, the change in the peak value of the MTF of the marginal field of view in the S direction of Lens 1, Lens 2, and Lens 3 are -0.72%, -0.77%, -0.74% respectively, and the change in the peak value of the MTF of the marginal field of view in the M direction are -0.68%, -1.34%, -1.35% respectively; when △SP6 decreases by 1um, the change in the peak value of the MTF of the marginal field of view in the S direction of Lens 1, Lens 2, and Lens 3 are -0.63%, -1.62%, -0.71% respectively, and the change in the peak value of the MTF of the marginal field of view in the M direction are -0.47%, -2.81%, -2.51% respectively. It can be seen that the peak value of the MTF of Lens 1 is less affected by deformation, and the optical sensitivity of Lens 1 is better.

[0070] The comprehensive sensitivity represents the influence of deformation on the peak value of the MTF of the lens. For example, referring to Table 2, the comprehensive sensitivities of Lens 1, Lens 2, and Lens 3 in the S direction are -0.28μm, -8.15μm, -3.32μm respectively, and the comprehensive sensitivities in the M direction are -0.21μm, -14.13μm, -11.75μm respectively. It can be seen that the force deformation of Lens 1 is small, and the influence of deformation on the peak value of the MTF is small. The comprehensive sensitivity of Lens 1 is small, and the assembly stability is good.

[0071] Combined with the above analysis, by making the optical imaging lens satisfy "10.3 < EP67 / T67 < 34.8", it is possible to ensure that the displacement amount of the distance between the sixth lens and the seventh lens on the optical axis is small, reduce the structural sensitivity and optical sensitivity of the optical imaging lens, thereby reducing the comprehensive sensitivity of the optical imaging lens and improving the assembly stability of the optical imaging lens.

[0072] In an exemplary embodiment, the spacer element group may include a seventh spacer element, and the seventh spacer element may be disposed on the image side of the seventh lens and at least partially contact the image side of the seventh lens. Among them, the radius of curvature R15 of the object side of the eighth lens and the outer diameter D7m of the image side of the seventh spacer element may satisfy: 0.4 ≤ R15 / D7m ≤ 0.7. By reasonably configuring the ratio of the radius of curvature of the object side of the eighth lens to the outer diameter of the image side of the seventh spacer element, the radius of curvature of the object side of the eighth lens can be restricted within an appropriate range, ensuring that light generates a greater refraction at the object side of the eighth lens, so as to match the image plane; at the same time, the outer diameter of the image side of the seventh spacer element can also be limited, making the outer diameter size of the seventh lens appropriate, and improving the processability and formability of the seventh lens.

[0073] In an exemplary embodiment, the spacer element group may include a seventh spacer element, and the seventh spacer element may be disposed on the image side surface of the seventh lens and at least partially in contact with the image side surface of the seventh lens. Among them, the axial distance SAG72 between the intersection point of the image side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image side surface of the seventh lens, the axial distance SAG82 between the intersection point of the image side surface of the eighth lens and the optical axis and the vertex of the effective radius of the image side surface of the eighth lens, and the maximum thickness CP7 of the seventh spacer element may satisfy: 0.7 < (|SAG82| + |SAG72|) / CP7 ≤ 1.2. By controlling the above conditional expression, when the seventh lens and the eighth lens meet the imaging requirements, a certain interval between the seventh lens and the eighth lens can be ensured, avoiding interference during the alignment of the seventh lens and the eighth lens; at the same time, the sagittal height of the image side surface of the seventh lens and the sagittal height of the image side surface of the eighth lens can be constrained within a reasonable range, improving the processability and formability of the seventh lens and the eighth lens.

[0074] In an exemplary embodiment, the spacer element group may include a seventh spacer element, and the seventh spacer element may be disposed on the image side surface of the seventh lens and at least partially in contact with the image side surface of the seventh lens. Among them, the radius of curvature R14 of the image side surface of the seventh lens and the outer diameter D7s of the object side surface of the seventh spacer element may satisfy: 1.7 < R14 / D7s < 3.1. By reasonably configuring the ratio of the radius of curvature of the image side surface of the seventh lens to the outer diameter of the object side surface of the seventh spacer element, the radius of curvature of the image side surface of the seventh lens can be positive and within an appropriate range, ensuring that the image side surface of the seventh lens diverges light and constraining the light path of the seventh lens, thus meeting the requirements of a large image plane; at the same time, the outer diameter of the object side surface of the seventh spacer element can be restricted, making the ratio of the outer diameter of the seventh lens to the central thickness appropriate, improving the processability and formability of the seventh lens.

[0075] In an exemplary embodiment, the outer diameter D0s of the object side end face of the lens barrel, the outer diameter D0m of the image side end face of the lens barrel, and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging lens may satisfy: 0.7 < (D0m - D0s) / ImgH < 1.25. By reasonably configuring the ratio of the difference between the outer diameter of the image side end face and the outer diameter of the object side end face of the lens barrel to half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens, the image height of the optical imaging lens and the outer shape size of the image side end of the optical imaging lens can be constrained, thus meeting the assembly process and imaging requirements of the camera module.

[0076] In an exemplary embodiment, the length L of the lens barrel in the direction of the optical axis and the sum ∑AT of the distances between any two adjacent lenses among the first lens to the eighth lens on the optical axis may satisfy: 2.7 < L / ∑AT < 3.3. By reasonably configuring the ratio of the length of the lens barrel in the direction of the optical axis to the sum of the distances between any two adjacent lenses among the first lens to the eighth lens on the optical axis, the overall optical length of the optical imaging lens can be constrained within a certain range, achieving miniaturization of the optical imaging lens. At the same time, it can also ensure that each lens meets the assembly process and imaging requirements of the camera module.

[0077] In an exemplary embodiment, the spacer element group may include a first spacer element, and the first spacer element may be disposed on the image side of the first lens and at least partially contact the image side of the first lens. Among them, the effective focal length f1 of the first lens and the inner diameter d1s of the object side of the first spacer element may satisfy: 1.35 < f1 / d1s ≤ 1.6. By reasonably configuring the ratio of the effective focal length of the first lens to the inner diameter of the object side of the first spacer element, the effective focal length of the first lens can be constrained, which is beneficial for the optical imaging lens to achieve the imaging effect of a large image plane. At the same time, when the first lens converges light, the inner diameter of the object side of the first spacer element can be within an appropriate range, reducing the risk of internal reflection stray light and improving the imaging quality of the optical imaging lens.

[0078] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element may be disposed on the image side of the first lens and at least partially contact the image side of the first lens, and the second spacer element may be disposed on the image side of the second lens and at least partially contact the image side of the second lens. Among them, the distance T12 between the first lens and the second lens on the optical axis, the distance T23 between the second lens and the third lens on the optical axis, and the distance EP12 between the first spacer element and the second spacer element along the optical axis may satisfy: 3.05 < EP12 / (T12 + T23) < 4.8. By controlling the above conditional formula, the processability of the first lens, the second lens, and the third lens can be improved, and the assembly stability of the first lens, the second lens, and the third lens can be improved.

[0079] In an exemplary embodiment, the spacer element group may include a second spacer element. The second spacer element may be disposed on the image side surface of the second lens and at least partially contact the image side surface of the second lens. Among them, the radius of curvature R4 of the image side surface of the second lens, the refractive index N2 of the second lens, and the outer diameter D2s of the object side surface of the second spacer element may satisfy: 1.5 < R4 × N2 / D2s < 2.5. By controlling the above conditional expression, the radius of curvature of the image side surface of the second lens and the refractive index of the second lens can be constrained within a reasonable range, so that the second lens has a large light refraction range, meets the imaging requirements of a large viewing angle, and reduces the contribution of the second lens to the spherical aberration of the system; at the same time, the outer diameter of the object side surface of the second spacer element can also be restricted to ensure that the outer diameter size of the second lens is appropriate and improve the machinability of the second lens.

[0080] In an exemplary embodiment, the spacer element group may include a second spacer element and a third spacer element. The second spacer element may be disposed on the image side surface of the second lens and at least partially contact the image side surface of the second lens. The third spacer element may be disposed on the image side surface of the third lens and at least partially contact the image side surface of the third lens. Among them, the distance EP23 along the optical axis between the second spacer element and the third spacer element, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis may satisfy: 1.0 < EP23 / (CT2 + CT3) < 1.2. By controlling the above conditional expression, the ratio of the edge thickness to the central thickness of the second lens and the third lens can be constrained within a reasonable range, improving the machinability and formability of the second lens and the third lens, and improving the assembly stability of the second lens and the third lens.

[0081] In an exemplary embodiment, the spacer element group may include a third spacer element. The third spacer element may be disposed on the image side surface of the third lens and at least partially contact the image side surface of the third lens. Among them, the radius of curvature R6 of the image side surface of the third lens, the refractive index N3 of the third lens, and the outer diameter D3s of the object side surface of the third spacer element may satisfy: 0.75 < R6 × N3 / D3s < 1.05. By controlling the above conditional expression, the radius of curvature of the image side surface of the third lens and the refractive index of the third lens can be within a reasonable range, and the light path of the third lens can be constrained, reducing the contribution of the third lens to the spherical aberration of the system; at the same time, the outer diameter of the object side surface of the third spacer element can also be restricted, making the outer diameter size of the third lens appropriate and the ratio of the outer diameter to the central thickness of the third lens appropriate, improving the machinability of the third lens.

[0082] In an exemplary embodiment, the spacer element group may include a third spacer element and a fourth spacer element. The third spacer element may be disposed on the image side of the third lens and at least partially contact the image side of the third lens. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially contact the image side of the fourth lens. Among them, the spacing distance T34 between the third lens and the fourth lens on the optical axis, the distance EP34 between the third spacer element and the fourth spacer element along the optical axis, and the maximum thickness CP4 of the fourth spacer element may satisfy: 1.1 < T34 / (EP34 + CP4) < 1.5. By controlling the above conditional formula, the thickness and shape of the third lens and the fourth lens can be reasonably constrained, the processability of the third lens and the fourth lens can be improved, and the assembly stability of the third lens and the fourth lens can be improved.

[0083] In an exemplary embodiment, the spacer element group may include a fourth spacer element. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially contact the image side of the fourth lens. Among them, the curvature radius R9 of the object side of the fifth lens, the inner diameter d4m of the image side of the fourth spacer element, and the outer diameter D4m of the image side of the fourth spacer element may satisfy: -14.05 < R9 / (D4m - d4m) < -4.6. By controlling the above conditional formula, the curvature radius of the object side of the fifth lens can be constrained, so that the refraction angle of light on the object side of the fifth lens is within a reasonable range; at the same time, the inner diameter and outer diameter of the image side of the fourth spacer element can also be restricted, so that the fourth spacer element can better cooperate with the lens barrel during assembly, and without affecting parameters such as the relative illuminance and chief ray angle (CRA) of the optical imaging lens, the fourth spacer element can block excess stray light, ensuring that the optical imaging lens has a good imaging picture.

[0084] In an exemplary embodiment, the spacer element group may include a fourth spacer element and a fifth spacer element. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially contact the image side of the fourth lens. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially contact the image side of the fifth lens. Among them, the distance EP45 between the fourth spacer element and the fifth spacer element along the optical axis and the central thickness CT5 of the fifth lens on the optical axis may satisfy: 1.5 < EP45 / CT5 < 2.15. By controlling the above conditional formula, the shape of the fifth lens can be constrained. For example, the ratio of the edge thickness to the central thickness of the fifth lens can be within a reasonable range, thereby improving the processability and formability of the fifth lens.

[0085] In an exemplary embodiment, the spacer element group may include a fifth spacer element, and the fifth spacer element may be disposed on the image side of the fifth lens and at least partially contact the image side of the fifth lens. Among them, the radius of curvature R10 of the image side of the fifth lens and the outer diameter D5s of the object side of the fifth spacer element may satisfy: -11.4 < R10 / D5s < -5.1. By reasonably configuring the ratio of the radius of curvature of the image side of the fifth lens to the outer diameter of the object side of the fifth spacer element, the radius of curvature of the image side of the fifth lens can be constrained, so that the light angles in the marginal fields of view are within an appropriate range, effectively reducing the sensitivity of the optical imaging lens; at the same time, the outer diameter of the object side of the fifth spacer element can also be restricted, ensuring that the outer diameter of the fifth lens is appropriate and improving the processability of the fifth lens.

[0086] In an exemplary embodiment, the spacer element group may include a fifth spacer element, and the fifth spacer element may be disposed on the image side of the fifth lens and at least partially contact the image side of the fifth lens. Among them, the radius of curvature R11 of the object side of the sixth lens and the outer diameter D5m of the image side of the fifth spacer element may satisfy: -1.35 < R11 / D5m < -0.9. By reasonably configuring the ratio of the radius of curvature of the object side of the sixth lens to the outer diameter of the image side of the fifth spacer element, the radius of curvature of the object side of the sixth lens can be constrained within an appropriate range, ensuring that the principal light angle of the optical imaging lens matches the principal light angle of the rear-end chip; at the same time, the outer diameter of the image side of the fifth spacer element can also be restricted, making the outer diameter of the fifth lens appropriate, reducing the molding sensitivity of the fifth lens, and improving the molding stability of the fifth lens.

[0087] The optical imaging lens according to the above embodiment of the present application may employ eight lenses and at least one spacer element. By reasonably allocating the parameters of each lens and each spacer element, characteristics such as a large image plane, a large field of view angle, and miniaturization of the optical imaging lens can be achieved, reducing the sensitivity of the optical imaging lens, improving the stray light risk of the optical imaging lens, improving the imaging quality of the optical imaging lens, and improving the processability and formability of the lens.

[0088] In an embodiment of the present application, at least one of the surfaces of each of the first lens to the eighth lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better radius of curvature characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side and the image side of each of the first lens to the eighth lens are both aspherical surfaces.

[0089] The second aspect of the present application provides an optical imaging lens, which may include a lens barrel, an imaging lens group, and a spacer element group disposed within the lens barrel. The imaging lens group may include a first lens with a positive focal power, a second lens with a focal power, a third lens with a negative focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, a sixth lens with a negative focal power, a seventh lens with a positive focal power, and an eighth lens with a negative focal power, arranged in sequence from the object side to the image side along the optical axis. The spacer element group may include a seventh spacer element, which may be disposed on the image side surface of the seventh lens and in contact with the image side surface of the seventh lens. The number of lenses with focal power in the optical imaging lens may be eight.

[0090] The radius of curvature R14 of the image side surface of the seventh lens and the outer diameter D7s of the object side surface of the seventh spacer element may satisfy: 1.7 < R14 / D7s < 3.1; the radius of curvature R15 of the object side surface of the eighth lens and the outer diameter D7m of the image side surface of the seventh spacer element may satisfy: 0.4 ≤ R15 / D7m ≤ 0.7. By controlling the above conditional expressions, the radii of curvature of the image side surface of the seventh lens and the object side surface of the eighth lens can be constrained, so that the image side surface of the seventh lens diverges light rays, constraining the light ray direction of the seventh lens, and the light rays generate greater refraction at the object side surface of the eighth lens, thus matching the image plane; at the same time, the outer diameters of the object side surface and the image side surface of the seventh spacer element can also be restricted, ensuring that the outer diameter size of the seventh lens is appropriate, improving the machinability and formability of the seventh lens.

[0091] The third aspect of the present application provides an optical imaging lens, which may include a lens barrel, an imaging lens group, and a spacer element group disposed within the lens barrel. The imaging lens group may include a first lens with a positive focal power, a second lens with a focal power, a third lens with a negative focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, a sixth lens with a negative focal power, a seventh lens with a positive focal power, and an eighth lens with a negative focal power, arranged in sequence from the object side to the image side along the optical axis. The spacer element group may include a first spacer element, which may be disposed on the image side surface of the first lens and in contact with the image side surface of the first lens. The number of lenses with focal power in the optical imaging lens may be eight.

[0092] The effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element may satisfy: 1.35 < f1 / d1s ≤ 1.6. Reasonably configuring the ratio of the effective focal length of the first lens to the inner diameter of the object side surface of the first spacer element can constrain the effective focal length of the first lens within an appropriate range, which is beneficial for the optical imaging lens to achieve the imaging effect of a large image plane; at the same time, while the first lens converges light rays, the inner diameter of the object side surface of the first spacer element can be within an appropriate range, reducing the risk of internal reflection stray light and improving the imaging quality of the optical imaging lens.

[0093] The fourth aspect of the present application provides an optical imaging lens, which may include a lens barrel, an imaging lens group, and a spacer element group disposed within the lens barrel. The imaging lens group may include a first lens with a positive focal power, a second lens with a focal power, a third lens with a negative focal power, a fourth lens with a positive focal power, a fifth lens with a negative focal power, a sixth lens with a negative focal power, a seventh lens with a positive focal power, and an eighth lens with a negative focal power, which are arranged in sequence from the object side to the image side along the optical axis. The spacer element group may include a fifth spacer element, and the fifth spacer element may be disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens. The number of lenses with a focal power in the optical imaging lens may be eight.

[0094] The radius of curvature R10 of the image side surface of the fifth lens and the outer diameter D5s of the object side surface of the fifth spacer element may satisfy: -11.4 < R10 / D5s < -5.1; the radius of curvature R11 of the object side surface of the sixth lens and the outer diameter D5m of the image side surface of the fifth spacer element may satisfy: -1.35 < R11 / D5m < -0.9. By controlling the above conditional expressions, the radius of curvature of the image side surface of the fifth lens and the object side surface of the sixth lens can be restricted, so that the light angles in the marginal field of view are within an appropriate range, effectively reducing the sensitivity of the optical imaging lens and ensuring that the principal light angle of the optical imaging lens matches the principal light angle of the rear-end chip; at the same time, the outer diameters of the object side surface and the image side surface of the fifth spacer element can also be restricted, ensuring that the outer diameter size of the fifth lens is appropriate, improving the processability and forming stability of the fifth lens.

[0095] Those skilled in the art should understand that, without departing from the technical solutions claimed in the present application, the number of lenses and spacer elements constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification.

[0096] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0097] Embodiment 1

[0098] The following refers to Figure 2 Describe the optical imaging lens according to Embodiment 1 of the present application.

[0099] As Figure 2 shown, the optical imaging lens may include a lens barrel, an imaging lens group, and a spacer element group disposed within the lens barrel. The imaging lens group may sequentially include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8 from the object side to the image side along the optical axis. An aperture STO (not shown) may be disposed between the first lens E1 and the second lens E2.

[0100] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. 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. In the example, the image side of the eighth lens E8 may also be provided with an optical element, such as a filter, having an object side surface S17 (not shown) and an image side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19 (not shown).

[0101] The spacer element group may 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 sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block excess light from entering the next lens during the imaging process, while also allowing the lens and lens barrel to better fit together, thus enhancing the structural stability of the optical imaging lens.

[0102] Table 3 shows the basic parameters of the optical imaging lens of Example 1, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0103]

[0104] Table 3

[0105] In this embodiment, the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, is 5.76 mm.

[0106] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical surface can be defined using, but is not limited to, the following aspherical surface formula:

[0107]

[0108] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 4 gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspherical surface S1-S16 in Example 1.

[0109]

[0110]

[0111] Table 4

[0112] Example 2

[0113] The following is for reference Figure 3 Describes an optical imaging lens according to Embodiment 2 of this application.

[0114] like Figure 3 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed within the lens barrel. The imaging lens group may include, sequentially from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. An aperture stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. An optical element may also be disposed on the image side of the eighth lens E8, such as a filter. The spacer element group may 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 sixth spacer element P6, and a seventh spacer element P7.

[0115] The structure of the imaging lens group in this embodiment is the same as that of the imaging lens group in Embodiment 1. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 3, and the aspherical coefficient table is the same as that in Table 4. The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different.

[0116] Figure 4A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 or 2 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 4B The astigmatism curves of the optical imaging lens of Embodiment 1 or 2 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 4C The distortion curves of the optical imaging lens of Embodiment 1 or 2 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 4D The magnification chromatic aberration curves of the optical imaging lens of Embodiment 1 or 2 are shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to Figure 4A , Figure 4B , Figure 4C and Figure 4D It can be seen that the optical imaging lens of Embodiment 1 or 2 can achieve good imaging quality.

[0117] Example 3

[0118] The following is for reference Figure 5 Describes an optical imaging lens according to Embodiment 3 of this application.

[0119] like Figure 5 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed within the lens barrel. The imaging lens group may include, in sequence along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. An aperture stop STO (not shown) may be disposed between the first lens E1 and the second lens E2.

[0120] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. 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. In the example, the image side of the eighth lens E8 may also be provided with an optical element, such as a filter, having an object side surface S17 (not shown) and an image side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19 (not shown).

[0121] The spacer element group may 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 sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block excess light from entering the next lens during the imaging process, while also allowing the lens and lens barrel to better fit together, thus enhancing the structural stability of the optical imaging lens.

[0122] Table 5 shows the basic parameters of the optical imaging lens of Example 3, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0123]

[0124] Table 5

[0125] In this embodiment, the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, is 5.76 mm.

[0126] In this embodiment, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the eighth lens E8, are aspherical. Table 6 lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical surfaces S1-S16 in Embodiment 3.

[0127] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.9473E-02 -2.4950E-02 -1.3743E-02 -4.5257E-03 -1.2901E-03 3.3476E-05 1.0280E-04 S2 -5.4857E-02 4.8102E-03 -1.1026E-03 -1.7553E-03 1.6794E-03 -1.0230E-03 6.0864E-04 S3 -5.0107E-02 -7.9548E-03 1.1669E-02 -4.3544E-03 2.3473E-03 -1.0312E-03 5.1764E-04 S4 -9.2103E-02 -2.7790E-03 6.6056E-03 -1.8238E-03 8.7071E-04 -3.4735E-04 2.1989E-04 S5 -3.0792E-01 5.3486E-02 -1.2417E-02 3.8380E-03 -8.2295E-04 2.6131E-04 2.9308E-05 S6 -2.3258E-01 3.5663E-02 -7.6821E-03 2.7022E-03 -1.4231E-04 3.5317E-04 9.0269E-05 S7 -1.7958E-01 -2.6426E-02 -1.1290E-03 1.2025E-03 9.6180E-04 5.1425E-04 3.1714E-04 S8 -3.2239E-01 -3.2222E-02 2.8077E-03 1.4640E-03 8.9197E-04 5.9677E-04 4.2875E-04 S9 -4.2051E-01 3.8946E-02 6.0128E-03 -5.9632E-03 -6.3261E-04 2.8220E-04 2.7068E-04 S10 -4.5338E-01 2.0966E-02 1.2377E-02 -5.3767E-03 6.6264E-03 2.6447E-03 8.3392E-04 S11 1.2116E-01 -2.1969E-01 2.2337E-02 -1.3957E-03 1.0283E-02 2.3699E-03 2.0345E-03 S12 -1.5251E+00 3.0706E-01 -7.8097E-02 3.2270E-02 -1.9634E-02 -3.1528E-03 8.8593E-04 S13 -4.4338E+00 6.3273E-01 -1.1245E-03 4.6639E-03 -4.1754E-02 2.4393E-02 5.9449E-04 S14 -5.0681E-01 -5.6251E-01 2.2966E-01 -5.4726E-02 3.8405E-02 -2.9604E-02 1.5538E-02 S15 -4.2341E+00 1.4143E+00 -7.1511E-01 3.7500E-01 -1.7235E-01 3.9395E-02 4.5851E-03 S16 -9.5828E+00 2.2869E+00 -8.7919E-01 3.2198E-01 -1.3822E-01 6.0564E-02 -4.1868E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 9.7771E-05 -5.8626E-06 -7.9559E-06 -2.0045E-05 -3.3586E-08 4.1138E-06 1.6299E-05 S2 -3.5537E-04 1.8884E-04 -1.1068E-04 6.5032E-05 -1.8550E-05 2.4237E-05 -9.7372E-07 S3 -2.6023E-04 1.4531E-04 -7.4900E-05 3.0615E-05 -1.4722E-05 3.1529E-06 -1.1620E-06 S4 -1.5482E-04 8.3404E-05 -8.0252E-05 2.5383E-05 -4.7213E-06 1.1726E-05 -2.9041E-06 S5 -5.5821E-05 3.2769E-05 -5.1949E-05 1.2757E-05 2.9229E-06 1.3319E-05 -4.9130E-07 S6 6.5965E-05 2.6734E-05 1.0619E-05 4.9443E-06 -6.1741E-07 -3.1515E-06 -5.0842E-06 S7 1.4745E-04 7.9753E-05 3.1563E-05 2.0022E-05 -1.2259E-06 2.3491E-06 -2.8299E-06 S8 1.8254E-04 7.5850E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -1.0939E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 -4.1728E-04 5.8458E-05 -3.6472E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -9.6958E-04 -4.0733E-04 -4.5369E-04 -6.5229E-05 0.0000E+00 0.0000E+00 0.0000E+00 S12 -1.2918E-04 -7.3390E-05 -2.9584E-04 -1.3103E-04 0.0000E+00 0.0000E+00 0.0000E+00 S13 -5.8432E-03 -2.2837E-03 3.0313E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 1.3924E-03 -3.1387E-03 -4.5388E-03 -7.3361E-04 2.3876E-03 2.4120E-04 1.1421E-06 S15 -4.4083E-03 -1.2352E-02 1.0343E-02 -2.2696E-03 2.3770E-04 6.0569E-04 9.2082E-05 S16 2.1656E-02 -1.2480E-02 3.9003E-03 -3.1600E-03 2.9966E-03 2.8336E-05 9.2171E-04

[0128] Table 6

[0129] Example 4

[0130] The following is for reference Figure 6 The optical imaging lens according to Embodiment 4 of this application is described.

[0131] like Figure 6 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed within the lens barrel. The imaging lens group may include, sequentially from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. An aperture stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. An optical element may also be disposed on the image side of the eighth lens E8, such as a filter. The spacer element group may 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 sixth spacer element P6, and a seventh spacer element P7.

[0132] The structure of the imaging lens group in this embodiment is the same as that in Embodiment 3. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 5, and the aspherical coefficient table is the same as that in Table 6. The difference between this embodiment and Embodiment 3 is that at least some of the elements in the lens barrel and spacer element group have different structural dimensions.

[0133] Figure 7AThe on-axis chromatic aberration curves of the optical imaging lens of Embodiment 3 or 4 are shown, which represent the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 7B The astigmatism curves of the optical imaging lens of Embodiment 3 or 4 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 7C The distortion curves of the optical imaging lens of Embodiment 3 or 4 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 7D The magnification chromatic aberration curves of the optical imaging lenses of Embodiment 3 or 4 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lens. According to... Figure 7A , Figure 7B , Figure 7C and Figure 7D It can be seen that the optical imaging lens of Embodiment 3 or 4 can achieve good imaging quality.

[0134] Example 5

[0135] The following is for reference Figure 8 Describes an optical imaging lens according to Embodiment 5 of this application.

[0136] like Figure 8 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed within the lens barrel. The imaging lens group may include, in sequence along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. An aperture stop STO (not shown) may be disposed between the first lens E1 and the second lens E2.

[0137] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. 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. In the example, the image side of the eighth lens E8 may also be provided with an optical element, such as a filter, having an object side surface S17 (not shown) and an image side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19 (not shown).

[0138] The spacer element group may 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 sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block excess light from entering the next lens during the imaging process, while also allowing the lens and lens barrel to better fit together, thus enhancing the structural stability of the optical imaging lens.

[0139] Table 7 shows the basic parameters of the optical imaging lens of Example 5, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0140]

[0141]

[0142] Table 7

[0143] In this embodiment, the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, is 6.33 mm.

[0144] In this embodiment, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the eighth lens E8, are aspherical. Table 8 shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical surfaces S1-S16 in Embodiment 5.

[0145]

[0146]

[0147] Table 8

[0148] Example 6

[0149] The following is for reference Figure 9 Describes an optical imaging lens according to Embodiment 6 of this application.

[0150] like Figure 9As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed within the lens barrel. The imaging lens group may include, sequentially from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. An aperture stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. An optical element may also be disposed on the image side of the eighth lens E8, such as a filter. The spacer element group may 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 sixth spacer element P6, and a seventh spacer element P7.

[0151] The structure of the imaging lens group in this embodiment is the same as that in Embodiment 5. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 7, and the aspherical coefficient table is the same as that in Table 8. The difference between this embodiment and Embodiment 5 is that the structural dimensions of at least some of the elements in the lens barrel and spacer element group are different.

[0152] Figure 10A The on-axis chromatic aberration curves of the optical imaging lens of Embodiment 5 or 6 are shown, which represent the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 10B The astigmatism curves of the optical imaging lens of Embodiment 5 or 6 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 10C The distortion curves of the optical imaging lens of Embodiment 5 or 6 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 10D The magnification chromatic aberration curves of the optical imaging lens of Embodiment 5 or 6 are shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figure 10A , Figure 10B , Figure 10C and Figure 10D It can be seen that the optical imaging lens of Embodiment 5 or 6 can achieve good imaging quality.

[0153] Example 7

[0154] The following is for reference Figure 11 Describes an optical imaging lens according to Embodiment 7 of this application.

[0155] like Figure 11 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed within the lens barrel. The imaging lens group may include, in sequence along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. An aperture stop STO (not shown) may be disposed between the first lens E1 and the second lens E2.

[0156] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. 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. In the example, the image side of the eighth lens E8 may also be provided with an optical element, such as a filter, having an object side surface S17 (not shown) and an image side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and is finally imaged on the imaging surface S19 (not shown).

[0157] The spacer element group may 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 sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block excess light from entering the next lens during the imaging process, while also allowing the lens and lens barrel to better fit together, thus enhancing the structural stability of the optical imaging lens.

[0158] Table 9 shows the basic parameters of the optical imaging lens of Example 7, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0159]

[0160] Table 9

[0161] In this embodiment, the value of ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, is 5.76 mm.

[0162] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 10 lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical surfaces S1-S16 in Embodiment 7.

[0163]

[0164]

[0165] Table 10

[0166] Example 8

[0167] The following is for reference Figure 12 Describes an optical imaging lens according to Embodiment 8 of this application.

[0168] like Figure 12 As shown, the optical imaging lens may include a lens barrel and an imaging lens group and a spacer element group disposed within the lens barrel. The imaging lens group may include, sequentially from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. An aperture stop STO (not shown) may be disposed between the first lens E1 and the second lens E2. An optical element may also be disposed on the image side of the eighth lens E8, such as a filter. The spacer element group may 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 sixth spacer element P6, and a seventh spacer element P7.

[0169] The structure of the imaging lens group in this embodiment is the same as that in Embodiment 7. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 9, and the aspherical coefficient table is the same as that in Table 10. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some of the elements in the lens barrel and spacer element group are different.

[0170] Figure 13A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 7 or 8 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 13B The astigmatism curves of the optical imaging lens of Embodiment 7 or 8 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 13C The distortion curves of the optical imaging lens of Embodiment 7 or 8 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 13D The magnification chromatic aberration curves of the optical imaging lens of Embodiment 7 or 8 are shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to Figure 13A , Figure 13B , Figure 13C and Figure 13D It can be seen that the optical imaging lens of Embodiment 7 or 8 can achieve good imaging quality.

[0171] Table 11 shows the values ​​of parameters d1s, D2s, D3s, d4m, D4m, D5s, D5m, D6s, D7s, D7m, D0s, D0m, EP12, EP23, EP34, CP4, EP45, EP67, CP7, L, SAG72, and SAG82 for each embodiment in Examples 1-8. At least some of these parameters can be obtained according to... Figure 1A or Figure 1B The annotation method shown was used to measure the data, and

[0172] The units for all parameters listed in Table 11 are mm.

[0173]

[0174]

[0175] Table 11

[0176] Table 12 shows the values ​​of the conditional expressions for each of the embodiments in Examples 1-8.

[0177] Conditional / Example 1 2 3 4 5 6 7 8 EP12 / (T12+T23) 3.79 3.06 4.78 4.41 4.56 4.76 3.43 4.07 EP67 / T67 16.92 34.76 13.68 13.68 10.34 10.71 30.81 30.81 f1 / d1s 1.54 1.37 1.56 1.57 1.57 1.58 1.60 1.54 EP23 / (CT2+CT3) 1.09 1.05 1.03 1.03 1.15 1.14 1.14 1.14 R15 / D7m 0.46 0.44 0.40 0.41 0.55 0.55 0.70 0.69 R6×N3 / D3s 0.88 0.82 0.99 0.79 0.78 0.95 0.81 1.03 T34 / (EP34+CP4) 1.49 1.49 1.11 1.28 1.30 1.29 1.26 1.20 (|SAG82|+|SAG72|) / CP7 0.87 0.84 0.87 0.85 0.75 0.83 1.20 1.20 R14 / D7s 1.82 1.75 2.09 2.07 3.04 3.05 1.78 1.76 (D0m-D0s) / ImgH 0.91 0.97 0.92 0.92 1.21 1.21 0.95 0.73 L / ∑AT 3.02 3.02 2.91 2.99 2.75 2.75 3.28 3.13 EP45 / CT5 2.10 1.57 1.75 1.89 2.14 2.12 1.53 2.05 R9 / (D4m-d4m) -5.43 -4.78 -4.68 -4.63 -5.03 -9.85 -5.67 -14.01 R4×N2 / D2s 1.65 1.55 2.16 1.83 2.04 2.46 1.97 2.32 R10 / D5s -10.77 -11.35 -7.50 -7.48 -5.14 -6.02 -7.44 -6.33 R11 / D5m -0.93 -0.97 -1.04 -1.04 -1.10 -1.29 -1.32 -1.11 R12 / D6s 1.78 1.37 1.90 1.90 1.84 1.77 0.85 0.84

[0178] Table 12

[0179] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0180] 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, include: An imaging lens group includes a first lens with positive optical power, a second lens with positive or negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens with negative optical power, arranged sequentially along the optical axis from the object side to the image side. A group of spacers includes a sixth spacer and a seventh spacer, wherein the sixth spacer is positioned on the image-side surface of the sixth lens and in contact with the image-side surface of the sixth lens, and the seventh spacer is positioned on the image-side surface of the seventh lens and in contact with the image-side surface of the seventh lens; as well as The lens barrel, in which the imaging lens group and the spacer element group are placed; The optical imaging lens has eight lenses with optical power. The spacing T67 between the sixth lens and the seventh lens on the optical axis and the distance EP67 between the sixth spacer element and the seventh spacer element along the optical axis satisfy: 10.3 <EP67 / T67<34.8; The radius of curvature R12 of the image-side surface of the sixth lens and the outer diameter D6s of the object-side surface of the sixth spacer element satisfy: 0.8 <R12 / D6s≤1.90。 2. The optical imaging lens according to claim 1, wherein, The radius of curvature R15 of the object side of the eighth lens and the outer diameter D7m of the image side of the seventh spacer element satisfy the following condition: 0.40≤R15 / D7m≤0.

70.

3. The optical imaging lens according to claim 1, wherein, The axial distance SAG72 between the intersection of the image-side surface of the seventh lens and the optical axis to the vertex of the effective radius of the image-side surface of the seventh lens, the axial distance SAG82 between the intersection of the image-side surface of the eighth lens and the optical axis to the vertex of the effective radius of the image-side surface of the eighth lens, and the maximum thickness CP7 of the seventh spacer element satisfy the following: 0.75≤(|SAG82|+|SAG72|) / CP7≤1.

20.

4. The optical imaging lens according to claim 1, wherein, The radius of curvature R14 of the image side of the seventh lens and the outer diameter D7s of the object side of the seventh spacer element satisfy the following condition: 1.75≤R14 / D7s≤3.

05.

5. The optical imaging lens according to claim 1, wherein, The outer diameter D0s of the object-side end face of the lens barrel, the outer diameter D0m of the image-side end face of the lens barrel, and half the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens satisfy the following condition: 0.7 < (D0m - D0s) / ImgH < 1.

25.

6. The optical imaging lens according to claim 1, wherein, The length L of the lens barrel along the optical axis and the sum of the distances between any two adjacent lenses from the first lens to the eighth lens on the optical axis, ∑AT, satisfy: 2.75≤L / ∑AT<3.

3.

7. The optical imaging lens according to any one of claims 1-6, wherein, The spacer element group further includes a first spacer element disposed on the image side of the first lens and in contact with the image side of the first lens; Wherein, the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfy: 1.35 <f1 / d1s≤1.60。 8. The optical imaging lens according to any one of claims 1-6, wherein, The spacer group further includes a first spacer element disposed on the image side of the first lens and in contact with the image side of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side of the second lens. Wherein, the spacing T12 between the first lens and the second lens on the optical axis, the spacing T23 between the second lens and the third lens on the optical axis, and the distance EP12 between the first spacer element and the second spacer element along the optical axis satisfy: 3.05 <EP12 / (T12+T23)<4.8。 9. The optical imaging lens according to any one of claims 1-6, wherein, The spacer element group further includes a second spacer element disposed on the image-side surface of the second lens and in contact with the image-side surface of the second lens; Wherein, the radius of curvature R4 of the image side of the second lens, the refractive index N2 of the second lens, and the outer diameter D2s of the object side of the second spacer element satisfy: 1.55≤R4×N2 / D2s<2.

5.

10. The optical imaging lens according to any one of claims 1-6, wherein, The spacer group further includes a second spacer element disposed on the image-side surface of the second lens and in contact with the image-side surface of the second lens, and a third spacer element disposed on the image-side surface of the third lens and in contact with the image-side surface of the third lens. Wherein, the distance EP23 between the second spacer element and the third spacer element along the optical axis, and the center thickness CT2 and center thickness CT3 of the second lens along the optical axis, satisfy: 1.0 <EP23 / (CT2+CT3)≤1.15。 11. The optical imaging lens according to any one of claims 1-6, wherein, The spacer element group further includes a third spacer element disposed on the image-side surface of the third lens and in contact with the image-side surface of the third lens; Wherein, the radius of curvature R6 of the image-side surface of the third lens, the refractive index N3 of the third lens, and the outer diameter D3s of the object-side surface of the third spacer element satisfy: 0.75 <R6×N3 / D3s<1.05。 12. The optical imaging lens according to any one of claims 1-6, wherein, The spacer group further includes a third spacer element disposed on the image-side surface of the third lens and in contact with the image-side surface of the third lens, and a fourth spacer element disposed on the image-side surface of the fourth lens and in contact with the image-side surface of the fourth lens. Wherein, the spacing T34 between the third lens and the fourth lens on the optical axis, the distance EP34 between the third spacer element and the fourth spacer element along the optical axis, and the maximum thickness CP4 of the fourth spacer element satisfy: 1.1 <T34 / (EP34+CP4)<1.5。 13. The optical imaging lens according to any one of claims 1-6, wherein, The spacer element group further includes a fourth spacer element disposed on the image-side surface of the fourth lens and in contact with the image-side surface of the fourth lens; Wherein, the radius of curvature R9 of the object-side surface of the fifth lens, the inner diameter d4m of the image-side surface of the fourth spacer element, and the outer diameter D4m of the image-side surface of the fourth spacer element satisfy: -14.05 <R9 / (D4m-d4m)<-4.6。 14. The optical imaging lens according to any one of claims 1-6, wherein, The spacer element group further includes a fourth spacer element disposed on the image-side surface of the fourth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer element disposed on the image-side surface of the fifth lens and in contact with the image-side surface of the fifth lens. Wherein, the distance EP45 between the fourth spacer element and the fifth spacer element along the optical axis and the center thickness CT5 of the fifth lens along the optical axis satisfy: 1.5 <EP45 / CT5<2.15。 15. The optical imaging lens according to any one of claims 1-6, wherein, The spacer element group further includes a fifth spacer element disposed on the image-side surface of the fifth lens and in contact with the image-side surface of the fifth lens; Wherein, the radius of curvature R10 of the image side of the fifth lens and the outer diameter D5s of the object side of the fifth spacer element satisfy: -11.35≤R10 / D5s<-5.

1.

16. The optical imaging lens according to any one of claims 1-6, wherein, The spacer element group further includes a fifth spacer element disposed on the image-side surface of the fifth lens and in contact with the image-side surface of the fifth lens; The radius of curvature R11 of the object-side surface of the sixth lens and the outer diameter D5m of the image-side surface of the fifth spacer element satisfy: -1.35 <R11 / D5m<-0.9。 17. The optical imaging lens according to any one of claims 1-6, wherein, The object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is convex, and the image-side surface is concave. The object-side surface of the third lens is convex, and the image-side surface is concave. The object-side surface of the fourth lens is convex, and the image-side surface is also convex. The object-side surface of the fifth lens is concave, and the image-side surface is convex. The object-side surface of the sixth lens is concave, and the image-side surface is also concave. The object-side surface of the seventh lens is convex, and the image-side surface is concave; and The object-side surface of the eighth lens is convex, and the image-side surface is concave.

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