Optical imaging lens

Abstract

The utility model discloses an optical imaging lens. The optical imaging lens comprises a lens barrel, an imaging lens group and a spacing element group, wherein the imaging lens group and the spacing element group are arranged in the lens barrel; the imaging lens group comprises 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 which are sequentially arranged from the object side to the image side along the optical axis, the first lens, the fourth lens and the seventh lens have positive focal power, and the third lens, the fifth lens, the sixth lens and the eighth lens have negative focal power; the spacing element group comprises a sixth spacing element and a seventh spacing element, the sixth spacing element is arranged on the image side surface of the sixth lens and is in contact with the image side surface of the sixth lens, and the seventh spacing element is arranged on the image side surface of the seventh lens and is in contact with the image side surface of the seventh lens; wherein the number of the lenses with the focal power of the optical imaging lens is eight; the spacing distance T67 between the sixth lens and the seventh lens on the optical axis and the distance EP67 between the sixth spacing element and the seventh spacing element along the optical axis meet the following conditions: 10.3 lt; eP 67 / T67 lt; 34.8, 34.8; the curvature radius R12 of the image side surface of the sixth lens and the outer diameter D6s of the object side surface of the sixth spacing element satisfy 0.8 lt; r < 12 > / D < 6 > slt; and 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 varies.

[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 spacer elements nearby are set unreasonably, the assembly stability of the optical imaging lens will deteriorate, thus affecting the imaging quality of the optical imaging lens. Summary of the Utility Model

[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 placed inside 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, which are 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 placed on the image side surface of the sixth lens and contacts the image side surface of the sixth lens. The seventh spacer element is placed on the image side surface of the seventh lens and contacts the image side surface 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 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 < 1.95.

[0005] According to an exemplary embodiment of this application, 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 satisfy: 0.4 ≤ R15 / D7m ≤ 0.7.

[0006] According to an exemplary embodiment of the present application, the on-axis distance SAG72 between the intersection of the image side surface of the seventh lens and the optical axis to the effective radius vertex of the image side surface of the seventh lens, the on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis to the effective radius vertex 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 the present application, the curvature radius 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 the present application, the outer diameter D0s of the object-side end surface of the lens barrel, the outer diameter D0m of the image-side end surface of the lens barrel, and half the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens ImgH satisfy the following: 0.7<(D0m-D0s) / ImgH<1.25.

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

[0010] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element, which is disposed on the image side surface of the first lens and contacts 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 the following relationship: 1.35 <f1 / d1s≤1.6。

[0011] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element and a second spacer element, the first spacer element is placed on the image side surface of the first lens and contacts the image side surface of the first lens, and the second spacer element is placed on the image side surface of the second lens and contacts the image side surface of the second lens. Wherein, the spacing distance T12 between the first lens and the second lens on the optical axis, the spacing 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 satisfy: 3.05 <EP12 / (T12+T23)<4.8。

[0012] According to an exemplary embodiment of the present application, the spacer element group further includes a second spacer element, which is disposed on the image side surface of the second lens and contacts the image side surface of the second lens. The curvature radius 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 the following conditions: 1.5 <R4×N2 / D2s<2.5。

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

[0014] According to an exemplary embodiment of the present application, the spacer element group further includes a third spacer element, which is disposed on the image side surface of the third lens and contacts the image side surface of the third lens. The curvature radius 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 the present application, the spacer element group further includes a third spacer element and a fourth spacer element. The third spacer element is disposed on the image side surface of the third lens and contacts the image side surface of the third lens. The fourth spacer element is disposed on the image side surface of the fourth lens and contacts the image side surface of the fourth lens. 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 the following conditions: 1.1 <T34 / (EP34+CP4)<1.5。

[0016] According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element, which is disposed on the image side surface of the fourth lens and contacts the image side surface of the fourth lens. The curvature radius 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 the following conditions: -14.05 <R9 / (D4m-d4m)<-4.6。

[0017] According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element and a fifth spacer element, the fourth spacer element is placed on the image side surface of the fourth lens and contacts the image side surface of the fourth lens, and the fifth spacer element is placed on the image side surface of the fifth lens and contacts 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 on the optical axis satisfy: 1.5 <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 plane, but at the same time increases 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 achieved 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. 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-restrictive embodiments with reference to the following drawings. Among them:

[0023] Figure 1A and Figure 1B respectively show a parameter annotation diagram of the optical imaging lens according to an embodiment of the present application;

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

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

[0026] Figure 4A 、 Figure 4B 、 Figure 4C 、 Figure 4D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Example 1 or 2 of the present application are respectively shown;

[0027] Figure 5 1 shows a schematic structural diagram of an optical imaging lens according to Example 3 of the present application;

[0028] Figure 6 1 shows a schematic structural diagram of an optical imaging lens according to Example 4 of the present application;

[0029] Figure 7A 、 Figure 7B 、 Figure 7C 、 Figure 7D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Example 3 or 4 of the present application are respectively shown;

[0030] Figure 8 1 shows a schematic structural diagram of an optical imaging lens according to Example 5 of the present application;

[0031] Figure 9 1 shows a schematic structural diagram of an optical imaging lens according to Example 6 of the present application;

[0032] Figure 10A 、 Figure 10B 、 Figure 10C 、 Figure 10D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Example 5 or 6 of the present application are respectively shown;

[0033] Figure 11 1 shows a schematic structural diagram of an optical imaging lens according to Example 7 of the present application;

[0034] Figure 12 1 shows a schematic structural diagram of an optical imaging lens according to Example 8 of the present application;

[0035] Figure 13A 、 Figure 13B 、 Figure 13C 、 Figure 13D axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens according to Example 7 or 8 of the present application are respectively shown; and

[0036] Figure 14 A schematic diagram showing the center points and edge points of the object-side and image-side surfaces of a lens in an optical imaging lens according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] In order to better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present 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 solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0039] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0040] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, 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 the present application can be simulated using software and / or tools such as ZEMAX and CODEV. Alternatively, the optical imaging lens can be simulated using CODEV software. During simulation using such software and / or tools, the surface profile of each lens can be appropriately adjusted based on the surface profile model provided by the software and / or tool.

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

[0043] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] refer to Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 、 Figure 8 、 Figure 9 、 Figure 11 and Figure 12 In a first aspect, the present application provides an optical imaging lens. The optical imaging lens may include an imaging lens group. The imaging lens group 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 in order from the object side to the image side along the optical axis. Among the first to eighth lenses, any two adjacent lenses may be separated by a 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 optical power 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 number of lenses having optical power in the optical imaging lens may be eight.

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

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

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

[0050] In example embodiments, the object-side surface of the fourth lens may be a convex surface, and the image-side surface may be a convex surface.

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

[0052] In example embodiments, the object-side surface of the sixth lens may be a concave surface, and the image-side surface may be a concave surface.

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

[0054] In example embodiments, 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 a stop, which may be disposed between the first lens and the second lens.

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

[0057] In an exemplary embodiment, the optical imaging lens may further include a lens barrel, wherein the imaging lens group and the spacer element group are disposed within the lens barrel. The lens barrel may include an object-side end surface, an image-side end surface, an outer annular surface, and an inner annular surface. The end surface of the lens barrel closest to the object side is the object-side end surface of the lens barrel, and the end surface of the lens barrel closest to the image side is the image-side end surface of the lens barrel. In a direction perpendicular to the optical axis, the surface of the lens barrel farthest 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 trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the lens may be smaller than the outer diameter of the non-trimmed portion of the lens. When the outer peripheral surface of a lens has a trimmed portion, the outer diameter of the lens generally refers to the outer diameter of the non-trimmed portion of the lens. For example, the outer diameter of the object-side surface of a lens refers to the outer diameter of the portion of the non-trimmed portion of the lens closest to the object side, while the outer diameter of the image-side surface of a lens refers to the outer diameter of the portion of the non-trimmed portion of the lens closest to the image side.

[0059] In an exemplary embodiment, the outer circumference of at least one spacer element in the spacer element group may have a trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the spacer element may be smaller than the outer diameter of the non-trimmed portion of the spacer element. When the outer circumference of the spacer element has a trimmed portion, the outer diameter of the spacer element generally refers to the outer diameter of the non-trimmed portion of the spacer element. For example, the outer diameter of the object-side surface of the spacer element refers to the outer diameter of the portion of the non-trimmed portion of the spacer element closest to the object side, and the outer diameter of the image-side surface of the spacer element refers to the outer diameter of the portion of the non-trimmed portion of the spacer element 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. Herein, 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 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 trend can be constrained, so that the sixth lens diverges light, thereby meeting the requirements of a large image plane. However, in this case, the sixth lens is relatively sensitive, the center position of its object side is far from the center 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 distance between the sixth lens and the seventh lens on the optical axis can provide 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 overall 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 a structural sensitivity analysis table of the distance T67 between the sixth lens and the seventh lens on the optical axis. Table 2 is an optical sensitivity and overall sensitivity analysis table of the 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 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 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 distance between the sixth lens and the seventh lens on the optical axis. As Figure 14As shown, the center point of the object-side surface of the sixth lens is M61, and the edge point of the object-side surface of the sixth lens is N61; the center point of the image-side surface of the sixth lens is M62, and the edge point of the image-side surface of the sixth lens is N62; the center point of the object-side surface of the seventh lens is M71, and the edge point of the object-side surface of the seventh lens is N71; the center point of the image-side surface of the seventh lens is M72, and the edge point of the image-side surface of the seventh lens is N72.

[0063] In Table 2, the S-peak value can be the S-curve peak value of the MTF curve at an edge field of view (e.g., 0.8 field of view), and the M-peak value can be the M-curve peak value of the MTF curve at an edge 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-peak value and / or the M-peak value will change accordingly. The change in the S-peak value and / or the M-peak value can be the optical sensitivity. The comprehensive sensitivity can be the product of the structural sensitivity and the 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 comprehensive sensitivity, the better the comprehensive sensitivity.

[0064]

[0065] Table 1

[0066]

[0067] Table 2

[0068] Structural sensitivity indicates the displacement of the sixth and seventh lenses of a lens when a certain load is applied to the lens. 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, causing the spacing between the sixth and seventh lenses to change. For example, referring to Table 1, through simulation, the structural sensitivities of Lenses 1, 2, and 3 are -0.44um, -5.03um, and -4.681um, respectively. It can be seen that Lens 1 has a smaller structural sensitivity, i.e., a smaller displacement, and therefore has a superior structural sensitivity.

[0069] Optical sensitivity represents the change in the peak MTF of the peripheral field of view of the lens when the displacement of the lens is constant. Lenses 1, 2, and 3 have the same displacement. For example, referring to Table 2, through simulation, when △SP6 increases by 1um, the changes in the peak MTF of the peripheral field of view in the S direction of Lenses 1, 2, and 3 are -0.72%, -0.77%, and -0.74% respectively, and the changes in the peak MTF of the peripheral field of view in the M direction are -0.68%, -1.34%, and -1.35% respectively; when △SP6 decreases by 1um, the changes in the peak MTF of the peripheral field of view in the S direction of Lenses 1, 2, and 3 are -0.63%, -1.62%, and -0.71% respectively, and the changes in the peak MTF of the peripheral field of view in the M direction are -0.47%, -2.81%, and -2.51% respectively. It can be seen that the peak 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 MTF of the lens. For example, referring to Table 2, the comprehensive sensitivities of Lenses 1, 2, and 3 in the S direction are -0.28μm, -8.15μm, and -3.32μm respectively, and the comprehensive sensitivities in the M direction are -0.21μm, -14.13μm, and -11.75μm respectively. It can be seen that the force deformation of Lens 1 is small, and the influence of deformation on the peak 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 placed 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 constrained within an appropriate range, ensuring that light rays are refracted more greatly 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 be restricted, 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 contact the image side surface of the seventh lens. Among them, the axial distance SAG72 between the intersection 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 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 when the seventh lens and the eighth lens are assembled; at the same time, the sag of the image side surface of the seventh lens and the sag of the image side surface of the eighth lens can be constrained within a reasonable range to improve 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. The seventh spacer element may be disposed on the image side surface of the seventh lens and at least partially contact 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, thereby meeting the requirements of a large image surface; 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 to the central thickness of the seventh lens appropriate, and improving the processability and formability of the seventh lens.

[0075] In an exemplary embodiment, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, and half of the diagonal length ImgH of the effective pixel area 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 diameters of the image side end surface and the object side end surface of the lens barrel to half of the diagonal length of the effective pixel area 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, thereby 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, realizing 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 placed 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 placed 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 placed 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, 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 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 may satisfy: 1.5 < R4 × N2 / D2s < 2.5. By controlling the above conditional formula, the radius of curvature of the image side 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 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 processability 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 of the second lens and at least partially contact the image side of the second lens, and 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. Among them, the distance EP23 between the second spacer element and the third spacer element along the optical axis, 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 formula, 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 processability 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, and 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. Among them, the radius of curvature R6 of the image side of the third lens, the refractive index N3 of the third lens, and the outer diameter D3s of the object side of the third spacer element may satisfy: 0.75 < R6 × N3 / D3s < 1.05. By controlling the above conditional formula, the radius of curvature of the image side 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 of the third spacer element can also be restricted, so that the outer diameter size of the third lens is appropriate, the ratio of the outer diameter of the third lens to the central thickness is appropriate, and the processability of the third lens is improved.

[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 radius of curvature 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 radius of curvature 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 illumination and the 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, which may be placed 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 angle of the marginal field of view is 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 to ensure that the outer diameter size of the fifth lens is appropriate, improving the machinability of the fifth lens.

[0086] In an exemplary embodiment, the spacer element group may include a fifth spacer element, which may be placed 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 to ensure 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, so that the outer diameter size of the fifth lens is 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 machinability 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, both the object side and the image side of each of the first lens to the eighth lens are 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 optical power, a second lens with an 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 may include a seventh spacer element, and the seventh spacer element 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 optical 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 the light rays, constraining the light ray path of the seventh lens, and the light rays generate a greater refraction at the object side surface of the eighth lens, thereby 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 processability 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 optical power, a second lens with an 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 may include a first spacer element, and the first spacer element 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 optical 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. By 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, the effective focal length of the first lens can be constrained 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 the light rays, the inner diameter of the object side surface of the first spacer element can be kept 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, 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, which may be disposed on the image side of the fifth lens and in contact with the image side 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 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; 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 controlling the above conditional expressions, the radii of curvature of the image side of the fifth lens and the object side of the sixth lens can be constrained, 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 and the image side 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 molding 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 this example, an optical element, such as a filter, may be further disposed on the image side of the eighth lens element E8. The optical element has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object sequentially passes through surfaces S1 to S18 and is ultimately imaged on an 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 spacers can block excess light from entering the next lens during the imaging process, while also improving the support between the lens and the lens barrel, thereby enhancing the structural stability of the optical imaging lens.

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

[0103]

[0104] Table 3

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

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

[0107]

[0108] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric 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 correction coefficient for the i-th order of the aspheric surface. Table 4 lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric surface S1-S16 in Example 1.

[0109]

[0110]

[0111] Table 4

[0112] Example 2

[0113] The following reference Figure 3 The optical imaging lens according to Example 2 of the present application is described.

[0114] like Figure 3 As shown, the optical imaging lens may include a lens barrel, an imaging lens group, and a spacer group disposed within the lens barrel. The imaging lens group may include, in order 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, such as a filter, may also be disposed on the image side of the eighth lens E8. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7.

[0115] The structure of the imaging lens assembly of this embodiment is identical to that of the imaging lens assembly of Example 1. Specifically, the basic parameter table of the optical imaging lens of this embodiment is identical to Table 3, and the aspheric coefficient table is identical to Table 4. This embodiment differs from Example 1 in that the lens barrel and at least some of the elements in the spacer element group have different structural dimensions.

[0116] Figure 4A The axial chromatic aberration curve of the optical imaging lens of Example 1 or 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 4B The astigmatism curve of the optical imaging lens of Example 1 or 2 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 4C The distortion curve of the optical imaging lens of Example 1 or 2 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 4D The chromatic aberration curve of the optical imaging lens of Example 1 or 2 is shown, which represents the deviation of the different image heights on the imaging surface after the light passes through the lens. Figure 4A 、 Figure 4B 、 Figure 4C and Figure 4D It can be seen that the optical imaging lens of Example 1 or 2 can achieve good imaging quality.

[0117] Example 3

[0118] The following reference Figure 5 The optical imaging lens according to Example 3 of the present application is described.

[0119] like Figure 5 As shown, the optical imaging lens may include a lens barrel, an imaging lens group, and a spacer group disposed within the lens barrel. The imaging lens group may include, in order 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. A 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 this example, an optical element, such as a filter, may be further disposed on the image side of the eighth lens element E8. The optical element has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object sequentially passes through surfaces S1 to S18 and is ultimately imaged on an 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 spacers can block excess light from entering the next lens during the imaging process, while also improving the support between the lens and the lens barrel, thereby enhancing the structural stability of the optical imaging lens.

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

[0123]

[0124] Table 5

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

[0126] In this embodiment, both the object-side and image-side surfaces of any of the first lens element E1 through the eighth lens element E8 are aspherical surfaces. 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 Example 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 reference Figure 6 An optical imaging lens according to Example 4 of the present application is described.

[0131] like Figure 6 As shown, the optical imaging lens may include a lens barrel, an imaging lens group, and a spacer group disposed within the lens barrel. The imaging lens group may include, in order 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, such as a filter, may also be disposed on the image side of the eighth lens E8. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7.

[0132] The structure of the imaging lens assembly of this embodiment is identical to that of the imaging lens assembly of Example 3. Specifically, the basic parameter table of the optical imaging lens of this embodiment is identical to Table 5, and the aspheric coefficient table is identical to Table 6. This embodiment differs from Example 3 in that the lens barrel and at least some of the elements in the spacer element group have different structural dimensions.

[0133] Figure 7AThe axial chromatic aberration curve of the optical imaging lens of Example 3 or 4 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 7B The astigmatism curve of the optical imaging lens of Example 3 or 4 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 7C The distortion curve of the optical imaging lens of Example 3 or 4 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 7D The chromatic aberration curve of the optical imaging lens of Example 3 or 4 is shown, which represents the deviation of the different image heights on the imaging surface after the light passes through the lens. Figure 7A 、 Figure 7B 、 Figure 7C and Figure 7D It can be seen that the optical imaging lens of Example 3 or 4 can achieve good imaging quality.

[0134] Example 5

[0135] The following reference Figure 8 The optical imaging lens according to Example 5 of the present application is described.

[0136] like Figure 8 As shown, the optical imaging lens may include a lens barrel, an imaging lens group, and a spacer group disposed within the lens barrel. The imaging lens group may include, in order 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. A 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 this example, an optical element, such as a filter, may be further disposed on the image side of the eighth lens element E8. The optical element has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object sequentially passes through surfaces S1 to S18 and is ultimately imaged on an 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 spacers can block excess light from entering the next lens during the imaging process, while also improving the support between the lens and the lens barrel, thereby 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 of curvature radius, thickness / distance, and focal length are all millimeters (mm).

[0140]

[0141]

[0142] Table 7

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

[0144] In this embodiment, both the object-side and image-side surfaces of any of the first lens element E1 through the eighth lens element E8 are aspherical surfaces. Table 8 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 Example 5.

[0145]

[0146]

[0147] Table 8

[0148] Example 6

[0149] The following reference Figure 9 The optical imaging lens according to Example 6 of the present application is described.

[0150] like Figure 9As shown, the optical imaging lens may include a lens barrel, an imaging lens group, and a spacer group disposed within the lens barrel. The imaging lens group may include, in order 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, such as a filter, may also be disposed on the image side of the eighth lens E8. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7.

[0151] The structure of the imaging lens assembly of this embodiment is identical to that of the imaging lens assembly of Example 5. Specifically, the basic parameter table of the optical imaging lens of this embodiment is identical to Table 7, and the aspheric coefficient table is identical to Table 8. This embodiment differs from Example 5 in that the lens barrel and at least some of the elements in the spacer element group have different structural dimensions.

[0152] Figure 10A The axial chromatic aberration curve of the optical imaging lens of Example 5 or 6 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 10B The astigmatism curve of the optical imaging lens of Example 5 or 6 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 10C The distortion curve of the optical imaging lens of Example 5 or 6 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 10D The chromatic aberration curve of the optical imaging lens of Example 5 or 6 is shown, which represents the deviation of the different image heights on the imaging surface after the light passes through the lens. Figure 10A 、 Figure 10B 、 Figure 10C and Figure 10D It can be seen that the optical imaging lens of Example 5 or 6 can achieve good imaging quality.

[0153] Example 7

[0154] The following reference Figure 11 An optical imaging lens according to Example 7 of the present application is described.

[0155] like Figure 11 As shown, the optical imaging lens may include a lens barrel, an imaging lens group, and a spacer group disposed within the lens barrel. The imaging lens group may include, in order 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. A stop STO (not shown) may be disposed between the first lens E1 and the second lens E2.

[0156] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative focal power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative focal power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative focal power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive focal power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative focal power, with its object-side surface S15 being convex and its image-side surface S16 being concave. In this example, an optical element, such as a filter, may be further disposed on the image side of the eighth lens element E8. The optical element has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object sequentially passes through surfaces S1 to S18 and is ultimately imaged on an 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 spacers can block excess light from entering the next lens during the imaging process, while also improving the support between the lens and the lens barrel, thereby 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 of curvature radius, thickness / distance, and focal length are all millimeters (mm).

[0159]

[0160] Table 9

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

[0162] In this embodiment, both the object-side and image-side surfaces of any of the first lens element E1 through the eighth lens element 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 Example 7.

[0163]

[0164]

[0165] Table 10

[0166] Example 8

[0167] The following reference Figure 12 The optical imaging lens according to Example 8 of the present application is described.

[0168] like Figure 12 As shown, the optical imaging lens may include a lens barrel, an imaging lens group, and a spacer group disposed within the lens barrel. The imaging lens group may include, in order 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, such as a filter, may also be disposed on the image side of the eighth lens E8. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a seventh spacer P7.

[0169] The structure of the imaging lens assembly of this embodiment is identical to that of the imaging lens assembly of Example 7. Specifically, the basic parameter table of the optical imaging lens of this embodiment is identical to Table 9, and the aspheric coefficient table is identical to Table 10. This embodiment differs from Example 7 in that the lens barrel and at least some of the elements in the spacer element group have different structural dimensions.

[0170] Figure 13A The axial chromatic aberration curve of the optical imaging lens of Example 7 or 8 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 13B The astigmatism curve of the optical imaging lens of Example 7 or 8 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 13C The distortion curve of the optical imaging lens of Example 7 or 8 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 13D The chromatic aberration curve of the optical imaging lens of Example 7 or 8 is shown, which represents the deviation of the different image heights on the imaging surface after the light passes through the lens. Figure 13A 、 Figure 13B 、 Figure 13C and Figure 13D It can be seen that the optical imaging lens of Example 7 or 8 can achieve good imaging quality.

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

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

[0173]

[0174]

[0175] Table 11

[0176] Table 12 shows the values of the conditional expressions of each of Examples 1 to 8.

[0177] Conditional formula / 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] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone 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 the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned 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, comprising, arranged in order from the object side to the image side along the optical axis, a first lens having positive refractive power, a second lens having positive or negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having negative refractive power, a seventh lens having positive refractive power, and an eighth lens having negative refractive power; a spacer element group, comprising a sixth spacer element and a seventh spacer element, the sixth spacer element being disposed on and in contact with the image-side surface of the sixth lens, and the seventh spacer element being disposed on and in contact with the image-side surface of the seventh lens; as well as a 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 distance T67 between the sixth lens and the seventh lens on the optical axis and the distance EP67 between the sixth spacing element and the seventh spacing element along the optical axis satisfy: 10.3 <EP67 / T67<34.8; The curvature radius 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<1.95。 2. The optical imaging lens according to claim 1, wherein: A curvature radius R15 of the object-side surface of the eighth lens element and an outer diameter D7m of the image-side surface of the seventh spacer element satisfy the following: 0.4≤R15 / D7m≤0.

7.

3. The optical imaging lens according to claim 1, wherein: The on-axis distance SAG72 between the intersection of the image side surface of the seventh lens and the optical axis and the effective radius vertex of the image side surface of the seventh lens, the on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis and the effective radius vertex 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.

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

25.

6. The optical imaging lens according to claim 1, wherein: The sum of the length L of the lens barrel along the direction of the optical axis and the distance between any two adjacent lenses from the first lens to the eighth lens on the optical axis ΣAT satisfies: 2.7 <L / ∑AT<3.3。 7. The optical imaging lens according to any one of claims 1 to 6, wherein: The spacer element group further includes a first spacer element disposed on the image side surface of the first lens 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 of the first spacer element satisfy: 1.35 <f1 / d1s≤1.6。 8. The optical imaging lens according to any one of claims 1 to 6, wherein: The spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens, and a second spacer element disposed on and in contact with the image side surface of the second lens; The spacing distance T12 between the first lens and the second lens on the optical axis, the spacing distance T23 between the second lens and the third lens on the optical axis, and the distance EP12 between the first spacing element and the second spacing 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 to 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; The curvature radius 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。 10. The optical imaging lens according to any one of claims 1 to 6, wherein: The spacer element group further includes a second spacer element disposed on and in contact with the image side surface of the second lens, and a third spacer element disposed on and in contact with the image side surface of the third lens; The distance EP23 between the second spacer element and the third spacer element along the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy the following conditions: 1.0 <EP23 / (CT2+CT3)<1.2。 11. The optical imaging lens according to any one of claims 1 to 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; The curvature radius 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 the following conditions: 0.75 <R6×N3 / D3s<1.05。 12. The optical imaging lens according to any one of claims 1 to 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, 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; The spacing distance T34 between the third lens and the fourth lens on the optical axis, the distance EP34 between the third spacing element and the fourth spacing element along the optical axis, and the maximum thickness CP4 of the fourth spacing element satisfy the following conditions: 1.1 <T34 / (EP34+CP4)<1.5。 13. The optical imaging lens according to any one of claims 1 to 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; The curvature radius 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 to 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; 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 on the optical axis satisfy the following conditions: 1.5 <EP45 / CT5<2.15。 15. The optical imaging lens according to any one of claims 1 to 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 curvature radius 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 satisfy the following conditions: -11.4 <R10 / D5s<-5.1。 16. The optical imaging lens according to any one of claims 1 to 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 curvature radius 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 the following relationship: -1.35 <R11 / D5m<-0.9。 17. The optical imaging lens according to any one of claims 1 to 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 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 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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