Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises a lens barrel, an eight-piece lens group and a spacer group arranged in the lens barrel, the eight-piece 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 arranged in sequence from an object side to an image side along an optical axis, and the spacer group comprises a sixth spacer and a seventh spacer; wherein the length L of the lens barrel in the direction of the optical axis and half of the diagonal line length ImgH of the effective pixel area on the imaging surface of the optical imaging lens satisfy 1.0 < L / ImgH < 1.3, the center thickness CT7 of the seventh lens on the optical axis, the interval EP67 of the sixth spacer and the seventh spacer along the optical axis and the maximum thickness CP7 of the seventh spacer satisfy 1.0 < CT7 / (EP67+CP7) < 2.0, and the curvature radius R14 of the image side surface of the seventh lens, the curvature radius R15 of the object side surface of the eighth lens, the inner diameter d7s of the object side surface of the seventh spacer and the inner diameter d7m of the image side surface of the seventh spacer satisfy -4.5 < d7s / R14+d7m / R15 ≤ -4.0.

Description

Technical Field

[0001] The present application relates to the field of optical devices, and specifically to an eight-piece optical imaging lens. Background Art

[0002] With the rapid development of portable devices such as smartphones, more new requirements have been put forward for the imaging functions of portable devices such as smartphones. For example, through the optical design of the imaging lens, the imaging lens of portable devices such as smartphones is provided with a large image plane, so as to meet the requirements of wide shooting range, good imaging effect and the like.

[0003] In order to meet the characteristics of miniaturization and large image plane, the eight-piece imaging lens is usually designed into a structural form with a small front aperture and a large rear aperture. At the same time, in order to realize the assembly integrity of the imaging lens, the seventh lens presents an appearance that is thick at the center and thin at the edge, which will cause the seventh lens to be relatively sensitive during the assembly process and have a large step difference. The large step difference needs to be transitioned by a spacer. When the spacer is not properly arranged, it will affect the assembly stability of the imaging lens, thereby affecting the imaging quality of the imaging lens. Summary of the Invention

[0004] The present application provides an optical imaging lens that can at least solve or partially solve at least one problem existing in the prior art or other problems.

[0005] An aspect of the present application provides such an optical imaging lens, which includes a lens barrel, as well as an eight-piece lens group and a spacer group arranged in the lens barrel. The eight-piece lens group includes 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 sequence from the object side to the image side along the optical axis. The spacer group includes a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer disposed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens. Wherein, the length L of the lens barrel in the direction where the optical axis is located and ImgH which is half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens satisfy: 1.0<L / ImgH<1.3. The center thickness CT7 of the seventh lens on the optical axis, the interval EP67 of the sixth spacer and the seventh spacer along the optical axis, and the maximum thickness CP7 of the seventh spacer satisfy: 1.0<CT7 / (EP67+CP7)<2.0. The radius of curvature R14 of the image side surface of the seventh lens, the radius of curvature R15 of the object side surface of the eighth lens, the inner diameter d7s of the object side surface of the seventh spacer, and the inner diameter d7m of the image side surface of the seventh spacer satisfy: -4.5<d7s / R14+d7m / R15≤-4.0.

[0006] According to an exemplary embodiment of this application, a first lens has positive optical power, with its object-side surface being convex and its image-side surface being concave; a second lens has negative optical power, with its object-side surface being convex and its image-side surface being concave; a third lens has positive optical power, with its object-side surface being convex and its image-side surface being concave; a fourth lens has positive optical power, with both its object-side and image-side surfaces being convex; a fifth lens has negative optical power, with its object-side surface being concave and its image-side surface being convex; a sixth lens has negative optical power, with both its object-side and image-side surfaces being concave; a seventh lens has positive optical power, with both its object-side and image-side surfaces being convex; and an eighth lens has negative optical power, with both its object-side and image-side surfaces being concave.

[0007] According to an exemplary embodiment of this application, the axial distance SAG72 between the intersection of the image-side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image-side surface of the seventh lens satisfies -42.0 with respect to the maximum thickness CP7 of the seventh spacer. <SAG72 / CP7<-19.0。

[0008] According to an exemplary embodiment of this application, the spacing EP67 between the sixth and seventh spacers along the optical axis and the thickness ET7 at the maximum effective diameter of the seventh lens satisfy: 1.0 <EP67 / ET7<2.5。

[0009] According to an exemplary embodiment of this application, the inner diameter d7m of the image side of the seventh spacer, the outer diameter D7m of the image side of the seventh spacer, the center thickness CT8 of the eighth lens on the optical axis, and the thickness ET8 at the maximum effective diameter of the eighth lens satisfy: 1.0 < (D7m - d7m) / (ET8 + CT8) < 3.0.

[0010] According to an exemplary embodiment of this application, the axial distance SAG62 between the intersection of the image-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image-side surface of the sixth lens satisfies -9.5 with the maximum thickness CP6 of the sixth spacer. <SAG62 / CP6<-6.0。

[0011] According to an exemplary embodiment of this application, the spacer assembly further includes a fifth spacer disposed between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens, wherein the spacing EP56 between the fifth and sixth spacers along the optical axis satisfies 0.1 with the maximum effective half-aperture DT71 of the object-side surface of the seventh lens. <EP56 / DT71<0.4。

[0012] According to an exemplary embodiment of this application, the spacer assembly further includes a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, wherein the axial distance SAG61 between the intersection of the object-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object-side surface of the sixth lens satisfies -18.0 with the maximum thickness CP5 of the fifth spacer. <SAG61 / CP5<-9.0。

[0013] According to an exemplary embodiment of this application, the spacer group further includes a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, wherein the outer diameter D5m of the image side of the fifth spacer, the outer diameter D6s of the object side of the sixth spacer, and the radius of curvature R12 of the image side of the sixth lens satisfy: 0.5 < (D5m + D6s) / R12 < 1.1.

[0014] According to an exemplary embodiment of this application, the spacer assembly further includes a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, wherein the effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the spacing EP56 between the fifth and sixth spacers along the optical axis satisfy: -32.0 <f6 / (CT6+EP56)<-11.0。

[0015] According to an exemplary embodiment of this application, the spacer group further includes a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, wherein the air gap T45 between the fourth lens and the fifth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the maximum thickness CP5 of the fifth spacer and the maximum thickness CP6 of the sixth spacer satisfy: 10.0≤T45 / CP5+T56 / CP6<15.0.

[0016] According to an exemplary embodiment of this application, the spacer assembly further includes a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens. The effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens on the optical axis, and the spacing EP45 of the fourth and fifth spacers along the optical axis satisfy: -50.0 <f5 / (CT5+EP45)<-14.0。

[0017] According to an exemplary embodiment of the present application, the spacer group further includes a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, wherein the sign attributes of the curvature radii of the object side surface and the image side surface of the fifth lens are the same, and the outer diameter D4m of the image side surface of the fourth spacer, the inner diameter d5s of the object side surface of the fifth spacer, and the curvature radius R9 of the object side surface of the fifth lens satisfy: -4.0<(D4m-d5s) / R9<-0.1.

[0018] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed between the first lens and the second lens and in contact with the image side surface of the first lens, and a second spacer disposed between the second lens and the third lens and in contact with the image side surface of the second lens, wherein the distance EP01 along the optical axis between the object side end face of the lens barrel and the first spacer, the distance EP12 along the optical axis between the first spacer and the second spacer, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 3.0<EP01 / CT1+EP12 / CT2<3.5.

[0019] In some embodiments of the present application, when the optical imaging lens satisfies 1.0<L / ImgH<1.3 and 1.0<CT7 / (EP67+CP7)<2.0, the miniaturization and assembly completeness of the optical imaging lens can be ensured. However, the condition that the optical imaging lens satisfies 1.0<CT7 / (EP67+CP7)<2.0 will cause the seventh lens to present an appearance with a thick center and thin edges, making the seventh lens more sensitive during the assembly process and prone to large step differences. Therefore, controlling the curvature radius of the image side surface of the seventh lens, the curvature radius of the object side surface of the eighth lens, the inner diameter of the object side surface of the seventh spacer, and the inner diameter of the image side surface of the seventh spacer to satisfy -4.5<d7s / R14+d7m / R15≤-4.0 is beneficial to improving the assembly stability of the optical imaging lens, avoiding deformation of the seventh spacer, and thus improving the imaging quality of the optical imaging lens. Brief Description of the Drawings

[0020] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which:

[0021] Figure 1 shows a schematic diagram of parameters of an optical imaging lens according to the present application;

[0022] Figure 2 shows a schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application;

[0023] Figure 3A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown;

[0024] Figures 4A to 4D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 1 or 2 of this application are shown respectively.

[0025] Figure 5 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown;

[0026] Figure 6 A schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application is shown;

[0027] Figures 7A to 7D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 3 or 4 of this application are shown respectively.

[0028] Figure 8 A schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of this application is shown;

[0029] Figure 9 A schematic diagram of the structure of an optical imaging lens according to Embodiment 6 of this application is shown;

[0030] Figures 10A to 10D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 5 or 6 of this application are shown respectively.

[0031] Figure 11 A schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of this application is shown;

[0032] Figure 12 A schematic diagram of the structure of an optical imaging lens according to Embodiment 8 of this application is shown; and

[0033] Figures 13A to 13D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 7 or 8 of this application are shown respectively. Detailed Implementation

[0034] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0035] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0036] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0037] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0038] It should also be understood that the terms "comprising" and / or "including" as used in this specification indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of this application, the term "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0039] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] The features, principles and other aspects of this application are described in detail below.

[0042] Figure 1 This is a structural layout diagram and a schematic diagram of some parameters of an optical imaging lens according to an exemplary embodiment of this application. (Reference) Figure 1D4m represents the outer diameter of the image-side surface of the fourth spacer, d5s represents the inner diameter of the object-side surface of the fifth spacer, D5m represents the outer diameter of the image-side surface of the fifth spacer, D6s represents the outer diameter of the object-side surface of the sixth spacer, d7s represents the inner diameter of the object-side surface of the seventh spacer, d7m represents the inner diameter of the image-side surface of the seventh spacer, D7m represents the outer diameter of the image-side surface of the seventh spacer, EP01 represents the distance between the object-side end face of the lens barrel and the first spacer along the optical axis, EP12 represents the distance between the first and second spacers along the optical axis, EP45 represents the distance between the fourth and fifth spacers along the optical axis, CP5 represents the maximum thickness of the fifth spacer, EP56 represents the distance between the fifth and sixth spacers along the optical axis, CP6 represents the maximum thickness of the sixth spacer, EP67 represents the distance between the sixth and seventh spacers along the optical axis, CP7 represents the maximum thickness of the seventh spacer, and L represents the length of the lens barrel in the direction of the optical axis.

[0043] refer to Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 11 and Figure 12 The first aspect of this application provides an optical imaging lens that may include an eight-lens group, which may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object side to the image side. An air gap may exist between any two adjacent lenses, from the first lens to the eighth lens.

[0044] In an exemplary embodiment, the first lens may have positive optical power; the object-side surface of the first lens may be convex, and the image-side surface may be concave. The second lens may have negative optical power; the object-side surface of the second lens may be convex, and the image-side surface may be concave. The third lens may have positive optical power; the object-side surface of the third lens may be convex, and the image-side surface may be concave. The fourth lens may have positive optical power; both the object-side and image-side surfaces of the fourth lens may be convex. The fifth lens may have negative optical power; the object-side surface of the fifth lens may be concave, and the image-side surface may be convex. The sixth lens may have negative optical power; both the object-side and image-side surfaces of the sixth lens may be concave. The seventh lens may have positive optical power; both the object-side and image-side surfaces of the seventh lens may be convex. The eighth lens may have negative optical power; both the object-side and image-side surfaces of the eighth lens may be concave.

[0045] In an exemplary embodiment, the optical imaging lens may further include a group of spacers, which may include one or more of a first spacer, a second spacer, a third spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer. The first spacer is positioned between a first lens and a second lens and at least partially contacts the image-side surface of the first lens. The second spacer is positioned between the second lens and a third lens and at least partially contacts the image-side surface of the second lens. The third spacer is positioned between the third lens and a fourth lens and at least partially contacts the image-side surface of the third lens. The fourth spacer is positioned between the fourth lens and a fifth lens and at least partially contacts the image-side surface of the fourth lens. The fifth spacer is positioned between the fifth lens and a sixth lens and at least partially contacts the image-side surface of the fifth lens. The sixth spacer is positioned between the sixth lens and a seventh lens and at least partially contacts the image-side surface of the sixth lens. The seventh spacer is positioned between the seventh lens and an eighth lens and at least partially contacts the image-side surface of the seventh lens. Proper use of spacers can effectively mitigate stray light risks, reduce interference with image quality, and thus improve the imaging quality of the optical imaging lens.

[0046] In an exemplary embodiment, the optical imaging lens may further include a lens barrel, an eight-element lens group, and a spacer group disposed within the lens barrel. The plane of the lens barrel closest to the object side and perpendicular to the optical axis is the object-side end face of the lens barrel, and the plane of the lens barrel closest to the image side and perpendicular to the optical axis is the image-side end face of the lens barrel. The axial distance between the object-side end face and the image-side end face of the lens barrel is the length of the lens barrel in the direction of the optical axis.

[0047] In an exemplary embodiment, the length L of the lens barrel in the direction of the optical axis and ImgH, which is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, may satisfy: 1.0<L / ImgH<1.3. The central thickness CT7 of the seventh lens on the optical axis, the spacing EP67 of the sixth spacer and the seventh spacer along the optical axis, and the maximum thickness CP7 of the seventh spacer may satisfy: 1.0<CT7 / (EP67+CP7)<2.0. The curvature radius R14 of the image side surface of the seventh lens, the curvature radius R15 of the object side surface of the eighth lens, the inner diameter d7s of the object side surface of the seventh spacer, and the inner diameter d7m of the image side surface of the seventh spacer may satisfy: -4.5<d7s / R14+d7m / R15≤-4.0. When the optical imaging lens satisfies 1.0<L / ImgH<1.3 and 1.0<CT7 / (EP67+CP7)<2.0, the miniaturization and assembly completeness of the optical imaging lens can be ensured. However, the condition that the optical imaging lens satisfies 1.0<CT7 / (EP67+CP7)<2.0 will cause the seventh lens to have an appearance with a thick center and thin edges, making the seventh lens relatively sensitive during the assembly process and prone to large step differences. Therefore, by controlling the curvature radius of the image side surface of the seventh lens, the curvature radius of the object side surface of the eighth lens, the inner diameter of the object side surface of the seventh spacer, and the inner diameter of the image side surface of the seventh spacer to satisfy -4.5<d7s / R14+d7m / R15≤-4.0, it is beneficial to improve the assembly stability of the optical imaging lens, avoid deformation of the seventh spacer, and thus improve the imaging quality of the optical imaging lens.

[0048] The table below shows the sensitivity between the seventh lens and the eighth lens when the optical imaging lens satisfies d7s / R14+d7m / R15=-4.5, d7s / R14+d7m / R15=-4.17, and d7s / R14+d7m / R15=-3.9.

[0049]

[0050] As can be seen from the above table, when the optical imaging lens satisfies 1.0<L / ImgH<1.3 and 1.0<CT7 / (EP67+CP7)<2.0, when d7s / R14+d7m / R15=-4.5, the sensitivity sp7 between the seventh lens and the eighth lens is -5.00; when d7s / R14+d7m / R15=-4.17, the sensitivity sp7 between the seventh lens and the eighth lens is 2.10; when d7s / R14+d7m / R15=-3.9, the sensitivity sp7 between the seventh lens and the eighth lens is 5.00. It can be seen that when d7s / R14+d7m / R15 is in the range of -4.5 to -4.0, the sensitivity between the seventh lens and the eighth lens is relatively low, while when d7s / R14+d7m / R15 is less than or equal to -4.5 or greater than -4.0, the sensitivity between the seventh lens and the eighth lens is relatively high. Therefore, in the present application, by making d7s / R14+d7m / R15 fall within the range of -4.5 to -4.0, it is beneficial to reduce the sensitivity between the seventh lens and the eighth lens, thereby improving the assembly stability and imaging quality of the optical imaging lens.

[0051] In an exemplary embodiment, the image-side surface of the seventh lens has no inflection point, and the on-axis distance SAG72 from the intersection of the image-side surface of the seventh lens and the optical axis to the vertex of the effective radius of the image-side surface of the seventh lens and the maximum thickness CP7 of the seventh spacer can satisfy: -42.0<SAG72 / CP7<-19.0. By constraining the ratio of the on-axis distance from the intersection of the image-side surface of the seventh lens and the optical axis to the vertex of the effective radius of the image-side surface of the seventh lens to the maximum thickness of the seventh spacer within a reasonable range, it is beneficial to improve the assembly stability of the optical imaging lens and avoid collision caused by the too close distance between the seventh lens and the eighth lens.

[0052] In an exemplary embodiment, the distance EP56 along the optical axis between the fifth spacer and the sixth spacer and the maximum effective half-caliber DT71 of the object-side surface of the seventh lens can satisfy: 0.1<EP56 / DT71<0.4. By constraining the ratio of the distance along the optical axis between the fifth spacer and the sixth spacer to the maximum effective half-caliber of the object-side surface of the seventh lens within a reasonable range, the distance along the optical axis between the fifth spacer and the sixth spacer can be effectively controlled, so as to effectively adjust the chief ray angle of the optical imaging lens, and improve the relative brightness and image plane clarity of the optical imaging lens.

[0053] In an exemplary embodiment, the spacing EP67 of the sixth spacer and the seventh spacer along the optical axis and the thickness ET7 of the seventh lens at the maximum effective diameter may satisfy: 1.0<EP67 / ET7<2.5. By constraining the ratio of the spacing of the sixth spacer and the seventh spacer along the optical axis to the thickness of the seventh lens at the maximum effective diameter within a reasonable range, the uniformity of the wall thickness of the seventh lens can be effectively ensured, the molding stability of the seventh lens is guaranteed, and the quality is improved accordingly.

[0054] In an exemplary embodiment, the inner diameter d7m of the image side of the seventh spacer, the outer diameter D7m of the image side of the seventh spacer, the center thickness CT8 of the eighth lens on the optical axis, and the thickness ET8 of the eighth lens at the maximum effective diameter may satisfy: 1.0<(D7m-d7m) / (ET8+CT8)<3.0. By constraining the ratio of the difference between the inner and outer diameters of the image side of the seventh spacer to the sum of the thickness of the eighth lens at the maximum effective diameter and the center thickness within a reasonable range, the problem that the seventh spacer is prone to deformation during the assembly process due to an excessively large size can be structurally avoided, while the uniformity of the wall thickness of the eighth lens can also be ensured, thereby effectively improving the overall quality of the optical imaging lens.

[0055] In an exemplary embodiment, the on-axis distance SAG62 between the intersection of the image side of the sixth lens and the optical axis and the vertex of the effective radius of the image side of the sixth lens and the maximum thickness CP6 of the sixth spacer may satisfy: -9.5<SAG62 / CP6<-6.0. By constraining the ratio of the on-axis distance between the intersection of the image side of the sixth lens and the optical axis and the vertex of the effective radius of the image side of the sixth lens to the maximum thickness of the sixth spacer within a reasonable range, the intensity of ghost images generated by reflection from the image side of the sixth lens and the object side of the seventh lens when light passes through the lenses can be reduced.

[0056] In an exemplary embodiment, the on-axis distance SAG61 between the intersection of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens and the maximum thickness CP5 of the fifth spacer may satisfy: -18.0<SAG61 / CP5<-9.0. By constraining the ratio of the on-axis distance between the intersection of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens to the maximum thickness of the fifth spacer within a reasonable range, the intensity of ghost images generated by reflection from the image side of the fifth lens and the object side of the sixth lens when light passes through the lenses can be reduced.

[0057] In an exemplary embodiment, the outer diameter D5m of the image side of the fifth spacer, the outer diameter D6s of the object side of the sixth spacer, and the radius of curvature R12 of the image side of the sixth lens may satisfy: 0.5<(D5m+D6s) / R12<1.1. By constraining the ratio of the sum of the outer diameters of the image side of the fifth spacer and the object side of the sixth spacer to the radius of curvature of the image side of the sixth lens within a reasonable range, the stability of the assembly gap of the lens group can be ensured.

[0058] In an exemplary embodiment, the effective focal length f6 of the sixth lens, the central thickness CT6 of the sixth lens on the optical axis, and the separation EP56 of the fifth spacer and the sixth spacer along the optical axis may satisfy: -32.0<f6 / (CT6+EP56)<-11.0. By controlling the mutual relationship among the effective focal length of the sixth lens, the central thickness of the sixth lens on the optical axis, and the separation of the fifth spacer and the sixth spacer along the optical axis, the overall curvature of the sixth lens can be structurally controlled, so as to further control the separation dimension of the fifth spacer and the sixth spacer along the optical axis, and effectively avoid the risk of molding weld marks caused by excessive curvature of the sixth lens and the deformation of the sixth lens during assembly.

[0059] In an exemplary embodiment, the air interval T45 of the fourth lens and the fifth lens on the optical axis, the air interval T56 of the fifth lens and the sixth lens on the optical axis, the maximum thickness CP5 of the fifth spacer and the maximum thickness CP6 of the sixth spacer may satisfy: 10.0≤T45 / CP5+T56 / CP6<15.0. By constraining the sum of the ratio of the air interval of the fourth lens and the fifth lens on the optical axis to the maximum thickness of the fifth spacer and the ratio of the air interval of the fifth lens and the sixth lens on the optical axis to the maximum thickness of the sixth spacer within a reasonable range, the uniformity of the wall thickness of the lenses and the stray light stability of the optical imaging lens can be ensured.

[0060] In an exemplary embodiment, the effective focal length f5 of the fifth lens, the central thickness CT5 of the fifth lens on the optical axis, and the separation EP45 of the fourth spacer and the fifth spacer along the optical axis may satisfy: -50.0<f5 / (CT5+EP45)<-14.0. By controlling the mutual relationship among the effective focal length of the fifth lens, the central thickness of the fifth lens on the optical axis, and the separation of the fourth spacer and the fifth spacer along the optical axis, the overall curvature of the fifth lens can be structurally controlled, so as to further control the separation dimension of the fourth spacer and the fifth spacer along the optical axis, and effectively avoid the risk of molding weld marks caused by excessive curvature of the fifth lens and the deformation of the fifth lens during assembly.

[0061] In an exemplary embodiment, the sign attributes of the curvature radii of the object side surface and the image side surface of the fifth lens are the same, and the outer diameter D4m of the image side surface of the fourth spacer, the inner diameter d5s of the object side surface of the fifth spacer, and the curvature radius R9 of the object side surface of the fifth lens may satisfy: -4.0<(D4m-d5s) / R9<-0.1. In an example, -0.4<(D4m-d5s) / R9<-0.1. By constraining the ratio of the difference between the outer diameter of the image side surface of the fourth spacer and the inner diameter of the object side surface of the fifth spacer to the curvature radius of the object side surface of the fifth lens within a reasonable range, the stability of the lens assembly gap is ensured.

[0062] In an exemplary embodiment, the distance EP01 along the optical axis between the object side end surface of the lens barrel and the first spacer, the distance EP12 along the optical axis between the first spacer and the second spacer, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis may satisfy: 3.0<EP01 / CT1+EP12 / CT2<3.5. By constraining the sum of the ratio of the distance along the optical axis between the object side end surface of the lens barrel and the first spacer to the center thickness of the first lens on the optical axis, and the ratio of the distance along the optical axis between the first spacer and the second spacer to the center thickness of the second lens on the optical axis within a reasonable range, the size of the optical imaging lens can be effectively reduced, which is also beneficial to adjusting the structure of the optical imaging lens and lowering the difficulty of lens processing and assembly.

[0063] In an exemplary embodiment, the optical imaging lens further comprises a stop disposed between the object side and the first lens.

[0064] The optical imaging lens according to the above embodiments of the present application may employ eight lenses and at least one spacer. By reasonably distributing the parameters of each lens and each spacer, miniaturization and large image plane of the optical imaging lens can be realized, the stray light phenomenon of the optical imaging lens is improved, and the assembly stability and imaging quality of the optical imaging lens are enhanced.

[0065] In the embodiments of the present application, at least one of the surfaces of each lens among the first lens to the eighth lens is an aspherical surface. The aspherical lens is characterized in that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, and has the advantages of improving distortion aberration and astigmatism aberration. After the aspherical lens is adopted, the aberration occurring during imaging can be eliminated as much as possible, and then the imaging quality is improved. Optionally, the object side surface and the image side surface of each of the first lens to the eighth lens are aspherical surfaces.

[0066] A second aspect of the present application provides such an optical imaging lens, which includes a lens barrel, and an eight-piece lens group and a spacer group disposed in the lens barrel. The eight-piece lens group includes 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 sequence from an object side to an image side along an optical axis. The spacer group includes a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, and a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens.

[0067] Wherein, the length L of the lens barrel in the direction of the optical axis and half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens can satisfy: 1.0<L / ImgH<1.3, and the spacing EP56 of the fifth spacer and the sixth spacer along the optical axis and the maximum effective half-caliber DT71 of the object-side surface of the seventh lens can satisfy: 0.1<EP56 / DT71<0.4. By constraining the ratio of the length of the lens barrel in the direction of the optical axis to half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens within a reasonable range, the miniaturization of the optical imaging lens can be ensured. At the same time, by constraining the ratio of the spacing of the fifth spacer and the sixth spacer along the optical axis to the maximum effective half-caliber of the object-side surface of the seventh lens within a reasonable range, the spacing of the fifth spacer and the sixth spacer along the optical axis can also be effectively controlled, so as to effectively adjust the chief ray angle of the optical imaging lens, and improve the relative brightness and image surface definition of the optical imaging lens.

[0068] A third aspect of the present application provides such an optical imaging lens, which includes a lens barrel, and an eight-piece lens group and a spacer group disposed in the lens barrel. The eight-piece lens group includes 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 sequence from an object side to an image side along an optical axis. The spacer group includes a seventh spacer disposed between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens.

[0069] Wherein, the length L of the lens barrel in the direction of the optical axis and ImgH, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, may satisfy: 1.0<L / ImgH<1.3. The inner diameter d7m of the image side of the seventh spacer, the outer diameter D7m of the image side of the seventh spacer, the center thickness CT8 of the eighth lens on the optical axis, and the thickness ET8 of the eighth lens at the maximum effective diameter may satisfy: 1.0<(D7m-d7m) / (ET8+CT8)<3.0. By constraining the ratio of the length of the lens barrel in the direction of the optical axis to half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens within a reasonable range, the miniaturization of the optical imaging lens can be ensured. At the same time, by constraining the ratio of the difference between the inner and outer diameters of the image side of the seventh spacer to the sum of the thickness at the maximum effective diameter and the center thickness of the eighth lens within a reasonable range, the problem that the seventh spacer is prone to deformation during the assembly process due to an excessively large size can be structurally avoided, and the uniformity of the wall thickness of the eighth lens can also be ensured, thereby effectively improving the overall quality of the optical imaging lens.

[0070] A fourth aspect of the present application provides such an optical imaging lens, which includes a lens barrel, and an eight-lens group and a spacer group disposed inside the lens barrel. The eight-lens group includes 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 sequence from the object side to the image side along the optical axis. The spacer group includes a seventh spacer disposed between the seventh lens and the eighth lens and in contact with the image side of the seventh lens.

[0071] Wherein, the length L of the lens barrel in the direction of the optical axis and ImgH, half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens, may satisfy: 1.0<L / ImgH<1.3; the image side of the seventh lens has no inflection point, and the axial distance SAG72 between the intersection point of the image side of the seventh lens and the optical axis to the vertex of the effective radius of the image side of the seventh lens and the maximum thickness CP7 of the seventh spacer may satisfy: -42.0<SAG72 / CP7<-19.0. By constraining the ratio of the length of the lens barrel in the direction of the optical axis to half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens within a reasonable range, the miniaturization of the optical imaging lens can be ensured. At the same time, by constraining the ratio of the axial distance from the intersection point of the image side of the seventh lens and the optical axis to the vertex of the effective radius of the image side of the seventh lens to the maximum thickness of the seventh spacer within a reasonable range, it is beneficial to improve the assembly stability of the optical imaging lens and avoid collision caused by the excessively close distance between the seventh lens and the eighth lens.

[0072] However, those skilled in the art will understand that, without departing from the technical solutions claimed in this application, the number of lenses and spacers constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification.

[0073] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the optical imaging lens applicable to the above-described embodiments.

[0074] Example 1

[0075] The following is for reference Figure 2 Describes an optical imaging lens according to Embodiment 1 of this application.

[0076] like Figure 2 As shown, the optical imaging lens 100 includes a lens barrel and an eight-element lens group and a spacer group disposed within the lens barrel. The eight-element lens group, from the object side to the image side, includes: 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 can be disposed between the object side and the first lens E1. The spacer group includes 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. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging lens.

[0077] 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 positive 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 convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. The filter has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0078] Table 1 shows the basic parameters of the optical imaging lens of Example 1, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0079]

[0080] Table 1

[0081] In this embodiment, the total effective focal length f of the optical imaging lens is 4.78 mm, half the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging lens is 4.25 mm, the axial distance SAG61 between the intersection of the object-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object-side surface of the sixth lens is -0.19 mm, the axial distance SAG62 between the intersection of the image-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image-side surface of the sixth lens is -0.19 mm, and the object-side surface of the seventh lens... The axial distance SAG71 between the intersection of the optical axis and the point on the object side of the seventh lens and the effective radius vertex of the seventh lens is 0.13 mm. The axial distance SAG72 between the intersection of the image side of the seventh lens and the optical axis and the effective radius vertex of the image side of the seventh lens is -0.45 mm. The maximum effective half-aperture DT71 of the object side of the seventh lens is 3.08 mm. The thickness ET7 at the maximum effective diameter of the seventh lens is 0.30 mm. The thickness ET8 at the maximum effective diameter of the eighth lens is 0.90 mm.

[0082] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0083]

[0084] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A16, A26, A36, A47, A68, A166 that can be used for the aspherical surfaces S1-S16 in Example 1. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0085] S1 3.0084E-02 -1.7816E-03 -6.0212E-03 -4.7986E-03 -2.6256E-03 -1.0456E-03 -3.2576E-04 S2 -2.5949E-02 -4.2127E-03 -7.9535E-03 -3.2028E-03 -2.1207E-04 4.7075E-04 2.7972E-04 S3 3.9669E-04 1.9173E-02 -7.6527E-03 -4.1902E-03 -1.2593E-03 -1.6716E-04 1.3273E-04 S4 7.5974E-02 2.9039E-02 1.8562E-03 -1.2418E-03 -1.1573E-03 -6.4125E-04 -1.9722E-04 S5 -6.0426E-02 1.7112E-02 7.3092E-03 7.7639E-04 -7.0646E-05 6.2684E-05 1.4197E-04 S6 -6.8860E-02 2.1090E-02 1.3575E-02 1.8955E-03 -1.2519E-04 -2.1301E-04 1.6508E-04 S7 -3.3755E-01 -4.2735E-03 1.4420E-02 2.2313E-03 -5.7521E-04 5.3941E-05 4.9792E-06 S8 -3.4393E-01 7.9679E-03 3.5378E-02 2.4026E-03 3.8761E-05 -5.7433E-04 1.0425E-04 S9 1.0242E-01 1.7820E-02 -1.9039E-02 -1.2539E-02 1.3909E-03 -2.3478E-03 2.3715E-03 S10 -4.3761E-01 1.4788E-01 -6.7792E-02 -1.4612E-02 2.7933E-02 -2.6302E-03 3.2279E-04 S11 -3.1611E-01 3.8962E-03 -2.6016E-02 -2.8998E-02 4.1780E-02 7.4786E-03 3.9693E-03 S12 -6.3135E-01 1.2078E-01 -1.0483E-01 3.0623E-02 7.3383E-03 1.0758E-02 8.3806E-03 S13 -4.2237E+00 1.1089E+00 -4.5213E-01 1.4602E-01 -4.4806E-02 2.6714E-02 1.3483E-03 S14 2.0001E+00 -3.6535E-01 1.8571E-01 -6.0063E-02 2.4208E-02 -5.8270E-03 1.6721E-03 S15 1.6627E+00 -2.0772E-01 -9.2817E-02 2.8107E-02 -1.0547E-02 1.1518E-02 4.5445E-03 S16 -1.6890E+00 3.0882E-01 -1.7913E-02 8.6345E-03 -1.6406E-02 3.7775E-03 1.1110E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -4.8092E-05 -9.2386E-06 -1.9158E-06 -4.1137E-07 -8.3461E-08 0.0000E+00 0.0000E+00 S2 2.7703E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 4.0361E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.1399E-05 -9.8743E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 1.6608E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 1.1347E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 9.8817E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 4.6719E-05 6.7763E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 9.1149E-05 1.4369E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 7.5809E-06 9.0558E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 -3.7194E-04 -1.6103E-05 4.0591E-06 2.0227E-06 6.1311E-07 0.0000E+00 0.0000E+00 S15 5.1285E-04 7.9112E-05 1.2641E-05 1.8278E-06 3.0058E-07 5.2030E-08 0.0000E+00 S16 3.1697E-05 1.1764E-06 4.4359E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0086] Table 2

[0087] Example 2

[0088] The following is for reference Figure 3 Describes an optical imaging lens according to Embodiment 2 of this application.

[0089] like Figure 3 As shown, the optical imaging lens 100 includes a lens barrel and an eight-element lens group and a spacer group disposed within the lens barrel. The eight-element lens group, from the object side to the image side, includes: 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 can be disposed between the object side and the first lens E1. The spacer group includes 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. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging lens.

[0090] The lens structure in this embodiment is the same as that in Embodiment 1. Specifically, the basic parameter table of the optical imaging lens in this embodiment is the same as Table 1, and the aspherical coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as D4m, d5s, D5m, D6s, d7s, d7m, D7m, EP01, EP12, EP45, CP5, EP56, CP6, EP67, CP7, and L are different.

[0091] Figure 4A The on-axis chromatic aberration curves of the optical imaging lenses of Examples 1 and 2 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 4B The astigmatism curves of the optical imaging lenses of Examples 1 and 2 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 4C The distortion curves of the optical imaging lenses of Examples 1 and 2 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 4D The magnification chromatic aberration curves of the optical imaging lenses of Examples 1 and 2 are shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 4A to 4D It can be seen that the optical imaging lenses given in Examples 1 and 2 can achieve good imaging quality.

[0092] Example 3

[0093] The following is for reference Figure 5 Describes an optical imaging lens according to Embodiment 3 of this application.

[0094] like Figure 5 As shown, the optical imaging lens 300 includes a lens barrel and an eight-element lens group and a spacer group disposed within the lens barrel. The eight-element lens group, from the object side to the image side, includes: 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 can be disposed between the object side and the first lens E1. The spacer group includes 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. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging lens.

[0095] 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 positive 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 convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. The filter has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0096] Table 3 shows the basic parameters of the optical imaging lens of Example 3, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0097]

[0098] Table 3

[0099] In this embodiment, the total effective focal length f of the optical imaging lens is 6.63 mm, half the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging lens is 5.64 mm, the axial distance SAG61 between the intersection of the object-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object-side surface of the sixth lens is -0.30 mm, the axial distance SAG62 between the intersection of the image-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image-side surface of the sixth lens is -0.17 mm, and the object-side surface of the seventh lens... The axial distance SAG71 between the intersection of the optical axis and the point on the object side of the seventh lens and the effective radius vertex of the seventh lens is 0.05 mm. The axial distance SAG72 between the intersection of the image side of the seventh lens and the optical axis and the effective radius vertex of the image side of the seventh lens is -0.73 mm. The maximum effective half-aperture DT71 of the object side of the seventh lens is 3.69 mm. The thickness ET7 at the maximum effective diameter of the seventh lens is 0.48 mm. The thickness ET8 at the maximum effective diameter of the eighth lens is 1.40 mm.

[0100] In this embodiment, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the eighth lens E8, are aspherical. Table 4 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical surface S1-S16 in Embodiment 3. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0101]

[0102]

[0103] Table 4

[0104] Example 4

[0105] The following is for reference Figure 6 The optical imaging lens according to Embodiment 4 of this application is described.

[0106] like Figure 6As shown, the optical imaging lens 400 includes a lens barrel and an eight-element lens group and a spacer group disposed within the lens barrel. The eight-element lens group, from the object side to the image side, includes: 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 can be disposed between the object side and the first lens E1. The spacer group includes 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. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging lens.

[0107] The lens structure in this embodiment is the same as that in Embodiment 3. Specifically, the basic parameter table of the optical imaging lens in this embodiment is the same as Table 3, and the aspherical coefficient table is the same as Table 4. The difference between this embodiment and Embodiment 3 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as D4m, d5s, D5m, D6s, d7s, d7m, D7m, EP01, EP12, EP45, CP5, EP56, CP6, EP67, CP7, and L are different.

[0108] Figure 7A The on-axis chromatic aberration curves of the optical imaging lenses of Examples 3 and 4 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 7B The astigmatism curves of the optical imaging lenses of Examples 3 and 4 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 7C The distortion curves of the optical imaging lenses in Examples 3 and 4 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 7D The magnification chromatic aberration curves of the optical imaging lenses of Examples 3 and 4 are shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 7A to 7D It can be seen that the optical imaging lenses given in Examples 3 and 4 can achieve good imaging quality.

[0109] Example 5

[0110] The following is for reference Figure 8 Describes an optical imaging lens according to Embodiment 5 of this application.

[0111] like Figure 8As shown, the optical imaging lens 500 includes a lens barrel and an eight-element lens group and a spacer group disposed within the lens barrel. The eight-element lens group, from the object side to the image side, includes: 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 can be disposed between the object side and the first lens E1. The spacer group includes 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. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging lens.

[0112] 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 positive 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 convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. The filter has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0113] Table 5 shows the basic parameters of the optical imaging lens of Example 5, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0114]

[0115]

[0116] Table 5

[0117] In this embodiment, the total effective focal length f of the optical imaging lens is 5.43 mm, half the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging lens is 5.30 mm, the axial distance SAG61 between the intersection of the object-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object-side surface of the sixth lens is -0.31 mm, the axial distance SAG62 between the intersection of the image-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image-side surface of the sixth lens is -0.17 mm, and the object-side surface of the seventh lens... The axial distance SAG71 between the intersection of the optical axis and the point on the object side of the seventh lens and the effective radius vertex of the seventh lens is -0.30 mm. The axial distance SAG72 between the intersection of the image side of the seventh lens and the optical axis and the effective radius vertex of the image side of the seventh lens is -0.82 mm. The maximum effective half-aperture DT71 of the object side of the seventh lens is 2.82 mm. The thickness ET7 at the maximum effective diameter of the seventh lens is 0.30 mm. The thickness ET8 at the maximum effective diameter of the eighth lens is 0.32 mm.

[0118] In this embodiment, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the eighth lens E8, are aspherical. Table 6 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical surfaces S1-S16 in Embodiment 5. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0119]

[0120]

[0121] Table 6

[0122] Example 6

[0123] The following is for reference Figure 9 Describes an optical imaging lens according to Embodiment 6 of this application.

[0124] like Figure 9As shown, the optical imaging lens 600 includes a lens barrel and an eight-element lens group and a spacer group disposed within the lens barrel. The eight-element lens group, from the object side to the image side, includes: 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 can be disposed between the object side and the first lens E1. The spacer group includes 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. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging lens.

[0125] The lens structure in this embodiment is the same as that in Embodiment 5. Specifically, the basic parameter table of the optical imaging lens in this embodiment is the same as Table 5, and the aspherical coefficient table is the same as Table 6. The difference between this embodiment and Embodiment 5 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as D4m, d5s, D5m, D6s, d7s, d7m, D7m, EP01, EP12, EP45, CP5, EP56, CP6, EP67, CP7, and L are different.

[0126] Figure 10A The on-axis chromatic aberration curves of the optical imaging lenses of Embodiments 5 and 6 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 10B The astigmatism curves of the optical imaging lenses of Examples 5 and 6 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 10C The distortion curves of the optical imaging lenses of Examples 5 and 6 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 10D The magnification chromatic aberration curves of the optical imaging lenses of Examples 5 and 6 are shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 10A to 10D It can be seen that the optical imaging lenses given in Examples 5 and 6 can achieve good imaging quality.

[0127] Example 7

[0128] The following is for reference Figure 11 Describes an optical imaging lens according to Embodiment 7 of this application.

[0129] like Figure 11As shown, the optical imaging lens 700 includes a lens barrel and an eight-element lens group and a spacer group disposed within the lens barrel. The eight-element lens group, from the object side to the image side, includes: 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 can be disposed between the object side and the first lens E1. The spacer group includes 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. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging lens.

[0130] 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 positive 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 convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. The filter has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0131] Table 7 shows the basic parameters of the optical imaging lens of Example 7, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0132]

[0133] Table 7

[0134] In this embodiment, the total effective focal length f of the optical imaging lens is 4.34 mm, half the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging lens is 4.24 mm, the axial distance SAG61 between the intersection of the object-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object-side surface of the sixth lens is -0.34 mm, the axial distance SAG62 between the intersection of the image-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image-side surface of the sixth lens is -0.13 mm, and the object-side surface of the seventh lens... The axial distance SAG71 between the intersection of the optical axis and the point on the object side of the seventh lens and the effective radius vertex of the seventh lens is -0.11 mm. The axial distance SAG72 between the intersection of the image side of the seventh lens and the optical axis and the effective radius vertex of the image side of the seventh lens is -0.38 mm. The maximum effective half-aperture DT71 of the object side of the seventh lens is 2.85 mm. The thickness ET7 at the maximum effective diameter of the seventh lens is 0.30 mm. The thickness ET8 at the maximum effective diameter of the eighth lens is 0.87 mm.

[0135] In this embodiment, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the eighth lens E8, are aspherical. Table 8 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical surfaces S1-S16 in Embodiment 7. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0136] S1 6.1818E-03 3.3381E-03 -1.2071E-04 5.6721E-05 -1.5322E-04 2.0548E-04 2.4924E-04 S2 -1.1065E-02 -1.3371E-03 -2.5857E-03 -7.3153E-04 -1.7038E-05 -1.7494E-05 1.4384E-05 S3 -3.1592E-02 1.9183E-03 -1.3374E-03 -6.2960E-04 2.2454E-04 -7.6994E-05 4.7124E-07 S4 9.7980E-03 1.3755E-02 1.3785E-03 3.5742E-04 3.5318E-04 -2.0078E-05 -8.9382E-06 S5 -5.2236E-02 6.7345E-03 5.2270E-03 1.1858E-03 6.5523E-05 -1.5938E-04 6.3061E-05 S6 -7.3271E-02 4.7555E-03 9.2615E-03 2.7593E-03 6.4540E-05 -3.2595E-04 4.7287E-05 S7 -2.6007E-01 -8.8779E-03 1.4306E-02 2.2816E-03 -1.9958E-03 -2.0734E-03 -3.5646E-04 S8 -2.4806E-01 -6.7896E-03 2.9812E-02 -6.4750E-04 -2.2031E-04 -8.3377E-04 4.5979E-05 S9 2.8401E-02 1.2214E-02 1.4269E-03 -3.4703E-03 4.6552E-03 1.3515E-03 -2.3753E-03 S10 -3.9526E-01 9.0113E-02 9.3236E-03 -1.8999E-02 -2.9452E-03 1.4246E-03 1.0005E-05 S11 -2.7018E-01 4.1891E-03 4.3046E-02 -7.4534E-03 9.6149E-04 -9.3291E-03 7.9757E-04 S12 -3.8493E-01 1.0127E-01 -3.9836E-02 1.0706E-02 9.6285E-03 -6.3180E-03 2.9700E-03 S13 -1.5233E+00 3.2064E-01 -3.6690E-02 1.4434E-02 -5.8605E-03 3.6384E-03 6.6818E-04 S14 8.2786E-01 -6.7528E-02 4.5418E-02 1.3674E-02 -3.3584E-03 1.3833E-03 3.3988E-03 S15 1.4122E+00 3.2353E-02 -1.1706E-01 4.8793E-02 -1.3786E-02 -2.0966E-03 1.4373E-03 S16 -9.4488E-01 2.6267E-01 -3.9553E-02 1.3410E-02 -1.1449E-02 8.8584E-03 1.4388E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -8.2424E-08 3.2418E-10 -3.8422E-09 6.7378E-10 -7.0142E-11 0.0000E+00 0.0000E+00 S2 5.6023E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 9.8163E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -2.4511E-07 -2.9191E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 6.8076E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 6.4696E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 2.0256E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 8.8471E-07 9.2410E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 1.7338E-06 1.9890E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 1.7638E-09 9.7826E-12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S14 -1.9094E-07 -4.0700E-08 7.1946E-09 -9.4215E-10 4.7177E-11 0.0000E+00 0.0000E+00 S15 -1.7142E-03 1.4528E-06 1.9884E-07 2.1503E-08 -1.2747E-09 8.0598E-10 0.0000E+00 S16 1.5531E-06 4.0214E-08 1.4083E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0137] Table 8

[0138] Example 8

[0139] The following is for reference Figure 12 Describes an optical imaging lens according to Embodiment 8 of this application.

[0140] like Figure 12As shown, the optical imaging lens 800 includes a lens barrel and an eight-element lens group and a spacer group disposed within the lens barrel. The eight-element lens group, from the object side to the image side, includes: 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 can be disposed between the object side and the first lens E1. The spacer group includes 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. The spacers can block excess light during the imaging process from entering the next lens, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging lens.

[0141] The lens structure in this embodiment is the same as that in Embodiment 7. Specifically, the basic parameter table of the optical imaging lens in this embodiment is the same as Table 7, and the aspherical coefficient table is the same as Table 8. The difference between this embodiment and Embodiment 7 lies in the structural dimensions of the lens barrel, the first spacer P1, the second spacer P2, the fourth spacer P4, the fifth spacer P5, the sixth spacer P6, and the seventh spacer P7. For example, parameters such as D4m, d5s, D5m, D6s, d7s, d7m, D7m, EP01, EP12, EP45, CP5, EP56, CP6, EP67, CP7, and L are different.

[0142] Figure 13A The on-axis chromatic aberration curves of the optical imaging lenses of Embodiments 7 and 8 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 13B The astigmatism curves of the optical imaging lenses of Examples 7 and 8 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 13C The distortion curves of the optical imaging lenses of Examples 7 and 8 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 13D The magnification chromatic aberration curves of the optical imaging lenses of Examples 7 and 8 are shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 13A to 13D It can be seen that the optical imaging lenses given in Examples 7 and 8 can achieve good imaging quality.

[0143] Table 9 shows the values ​​of parameters D4m, d5s, D5m, D6s, d7s, d7m, D7m, EP01, EP12, EP45, CP5, EP56, CP6, EP67, CP7, and L for each embodiment in Examples 1 to 8. These parameters can be calculated according to... Figure 1 The measurements were obtained using the annotation method shown, and the units of the parameters listed in Table 9 are all in mm.

[0144] D4m 5.90 5.90 8.62 7.62 6.42 5.76 6.26 6.26 d5s 4.74 4.74 5.45 5.45 4.39 4.39 4.22 4.22 D5m 6.30 6.30 8.86 8.26 6.66 6.66 6.76 5.53 D6s 7.10 7.10 9.10 9.10 8.10 8.10 7.26 7.26 d7s 6.51 6.51 7.95 7.95 6.82 6.82 6.26 6.26 d7m 6.51 6.51 7.95 7.95 6.82 6.82 6.26 6.26 D7m 8.30 8.30 10.00 10.00 8.60 8.60 7.76 7.76 EP01 0.88 0.88 0.91 0.91 1.11 1.11 1.07 1.07 EP12 0.58 0.54 0.68 0.68 0.61 0.60 0.60 0.61 EP45 0.49 0.44 0.52 0.52 0.32 0.32 0.21 0.21 EP56 0.40 0.40 0.86 0.86 0.53 0.53 0.84 0.85 EP67 0.72 0.72 0.63 0.63 0.41 0.41 0.48 0.48 CP5 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 CP6 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 CP7 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 L 5.45 5.45 6.70 6.70 5.80 5.79 5.35 5.35

[0145] Table 9

[0146] Table 10 shows the values ​​of the conditional expressions for each of the embodiments in Examples 1 to 8.

[0147]

[0148]

[0149] Table 10

[0150] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0151] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that, include: An eight-element lens group, consisting of the following elements sequentially along the optical axis from the object side to the image side: The first lens with positive optical power has a convex object side and a concave image side. A second lens with negative optical power has a convex object side and a concave image side. A third lens with positive optical power has a convex object-side surface and a concave image-side surface; The fourth lens with positive optical power has a convex object-side surface and a convex image-side surface; The fifth lens with negative optical power has a concave object side and a convex image side. The sixth lens has negative optical power, with both the object-side and image-side surfaces being concave. The seventh lens with positive optical power has a convex object-side surface and a convex image-side surface. The eighth lens with negative optical power has a concave object side and a concave image side. A spacer assembly includes a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer. The fourth spacer is positioned between the fourth lens and the fifth lens and contacts the image-side surface of the fourth lens. The fifth spacer is positioned between the fifth lens and the sixth lens and contacts the image-side surface of the fifth lens. The sixth spacer is positioned between the sixth lens and the seventh lens and contacts the image-side surface of the sixth lens. The seventh spacer is positioned between the seventh lens and the eighth lens and contacts the image-side surface of the seventh lens. The lens barrel, the eight-element lens group, and the spacer group are placed inside the lens barrel. The optical imaging lens has eight lenses with optical power. The length L of the lens barrel along the optical axis and half the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens satisfy the following condition: 1.09 ≤ L / ImgH < 1.

3. The center thickness CT7 of the seventh lens on the optical axis, the spacing EP67 between the sixth and seventh spacers along the optical axis, and the maximum thickness CP7 of the seventh spacer satisfy: 1.19 ≤ CT7 / (EP67+CP7) ≤ 1.

94. The radius of curvature R14 of the image-side surface of the seventh lens, the radius of curvature R15 of the object-side surface of the eighth lens, the inner diameter d7s of the object-side surface of the seventh spacer, and the inner diameter d7m of the image-side surface of the seventh spacer satisfy: -4.17≤d7s / R14+d7m / R15≤-4.

0. The outer diameter D4m of the image side of the fourth spacer, the inner diameter d5s of the object side of the fifth spacer, and the radius of curvature R9 of the object side of the fifth lens satisfy: -0.39≤(D4m-d5s) / R9<-0.

1.

2. The optical imaging lens according to claim 1, characterized in that, 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 satisfies the following condition with respect to the maximum thickness CP7 of the seventh spacer: -41.12≤SAG72 / CP7≤-19.

19.

3. The optical imaging lens according to claim 1, characterized in that, The spacing EP67 between the sixth and seventh spacers along the optical axis and the thickness ET7 at the maximum effective diameter of the seventh lens satisfy the following condition: 1.31≤EP67 / ET7≤2.

40.

4. The optical imaging lens according to claim 1, characterized in that, The inner diameter d7m of the image side of the seventh spacer, the outer diameter D7m of the image side of the seventh spacer, the center thickness CT8 of the eighth lens on the optical axis, and the thickness ET8 at the maximum effective diameter of the eighth lens satisfy: 1.06≤(D7m-d7m) / (ET8+CT8)≤2.

87.

5. The optical imaging lens according to claim 1, characterized in that, The axial distance SAG62 between the intersection of the image-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image-side surface of the sixth lens satisfies the following condition with respect to the maximum thickness CP6 of the sixth spacer: -9.5 < SAG62 / CP6 ≤ -6.

48.

6. The optical imaging lens according to any one of claims 1-5, characterized in that, The spacing EP56 between the fifth and sixth spacers along the optical axis and the maximum effective half-aperture DT71 of the object side of the seventh lens satisfy the following condition: 0.1 < EP56 / DT71 ≤ 0.

30.

7. The optical imaging lens according to any one of claims 1-5, characterized in that, The axial distance SAG61 between the intersection of the object-side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object-side surface of the sixth lens satisfies the following condition with the maximum thickness CP5 of the fifth spacer: -17.13≤SAG61 / CP5≤-9.

58.

8. The optical imaging lens according to any one of claims 1-5, characterized in that, The outer diameter D5m of the image side of the fifth spacer, the outer diameter D6s of the object side of the sixth spacer, and the radius of curvature R12 of the image side of the sixth lens satisfy: 0.57≤(D5m+D6s) / R12≤1.

05.

9. The optical imaging lens according to any one of claims 1-5, characterized in that, The effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the spacing EP56 of the fifth and sixth spacers along the optical axis satisfy: -31.08≤f6 / (CT6+EP56)≤-11.

94.

10. The optical imaging lens according to any one of claims 1-5, characterized in that, The air gap T45 between the fourth and fifth lenses on the optical axis, the air gap T56 between the fifth and sixth lenses on the optical axis, the maximum thickness CP5 of the fifth spacer and the maximum thickness CP6 of the sixth spacer satisfy: 10.0≤T45 / CP5+T56 / CP6≤14.

62.

11. The optical imaging lens according to any one of claims 1-5, characterized in that, The effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens on the optical axis, and the spacing EP45 of the fourth and fifth spacers along the optical axis satisfy: -46.16≤f5 / (CT5+EP45)≤-14.

71.

12. The optical imaging lens according to any one of claims 1-5, characterized in that, The spacer assembly further includes a first spacer disposed between the first lens and the second lens and in contact with the image-side surface of the first lens, and a second spacer disposed between the second lens and the third lens and in contact with the image-side surface of the second lens. Wherein, the distance EP01 between the object-side end face of the lens barrel and the first spacer along the optical axis, the distance EP12 between the first spacer and the second spacer along the optical axis, the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: 3.22≤EP01 / CT1+EP12 / CT2≤3.40.

Images