Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises a lens barrel, a lens set and a plurality of spacer elements arranged in the lens barrel, wherein the lens set comprises, in sequence from the object side to the image side along the optical axis, a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with negative refractive power, a seventh lens with positive refractive power and an eighth lens with negative refractive power, and a spacing distance is arranged between any two adjacent lenses; wherein the radius of curvature R12 of the image side surface of the sixth lens, the radius of curvature R15 of the object side surface of the eighth lens, the spacing distance EP67 of the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis direction, the central thickness CT6 of the sixth lens on the optical axis, the central thickness CT7 of the seventh lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis satisfy the following condition: -5.0 < R12 / (CT6+CT8+EP67)+R15 / (CT7+EP67) < -2.0.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical imaging lens. Background Technology

[0002] As people's demand for imaging lenses increases, the requirements for lens assembly and molding also increase. While studying imaging quality, the diversification of eight lens elements can lead to the production of various non-standard lenses, making it impossible to achieve effective lens molding. Therefore, ensuring the feasibility of lens molding process, rationally designing secondary auxiliary components, and achieving a compact layout of lens structure have become essential research for the stable production of high-quality lens structures.

[0003] Therefore, for eight-element optical imaging lenses, due to the large number of lenses, the rear lens is prone to irregularities, making assembly stability and optical imaging quality more difficult to control. How to reasonably arrange the lenses and spacers to meet the optical parameter requirements while shortening the overall lens height, achieving a smaller size, and balancing the distortion caused by the lenses remains one of the hot research topics for those skilled in the art. Summary of the Invention

[0004] The first aspect of this application provides an optical imaging lens comprising: a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel, wherein the lens group comprises, along the optical axis from the object side to the image side, a first lens having negative optical power, a second lens having positive optical power, a third lens having positive optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, a sixth lens having negative optical power, a seventh lens having positive optical power, and an eighth lens having negative optical power, wherein any two adjacent lenses are spaced apart; and the plurality of spacers comprises: a sixth spacer disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens, a seventh spacer disposed on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens, and a spacer disposed on the image side of the seventh lens. An eighth fixing element is located on the image side of the eighth lens and is at least partially in contact with the image side of the eighth lens; wherein the distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis is less than or equal to the distance EP78 between the image side of the seventh spacer element and the object side of the eighth fixing element along the optical axis; the center thickness of the seventh lens on the optical axis is greater than the center thickness of the other lenses on the optical axis; and the radius of curvature R12 of the image side of the sixth lens, the radius of curvature R15 of the object side of the eighth lens, the distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis, the center thickness CT6 of the sixth lens on the optical axis, the center thickness CT7 of the seventh lens on the optical axis, and the center thickness CT8 of the eighth lens on the optical axis satisfy: -5.0 <R12 / (CT6+CT8+EP67)+R15 / (CT7+EP67)<-2.0。

[0005] A second aspect of this application provides an optical imaging lens comprising: a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel, wherein the lens group comprises, along the optical axis from the object side to the image side, a first lens having negative optical power, a second lens having positive optical power, a third lens having positive optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, a sixth lens having negative optical power, a seventh lens having positive optical power, and an eighth lens having negative optical power, wherein any two adjacent lenses are spaced apart; and the plurality of spacers comprises: a sixth spacer disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens, a seventh spacer disposed on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens, and a spacer disposed on the image side of the seventh lens. An eighth fixed element that is at least partially in contact with the image side of the eighth lens; wherein the distance EP67 between the image side of the sixth spacer and the object side of the seventh spacer along the optical axis is less than or equal to the distance EP78 between the image side of the seventh spacer and the object side of the eighth fixed element along the optical axis; the center thickness of the seventh lens on the optical axis is greater than the center thickness of the other lenses on the optical axis; and the dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens, the radius of curvature R14 of the image side of the seventh lens, the radius of curvature R15 of the object side of the eighth lens, the inner diameter d7m of the image side of the seventh spacer and the inner diameter d8m of the image side of the eighth fixed element satisfy: (V7×R14+V8×R15) / (d7m+d8m)<-20.0.

[0006] A third aspect of this application provides an optical imaging lens comprising: a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel, wherein the lens group comprises, along the optical axis from the object side to the image side, a first lens having negative optical power, a second lens having positive optical power, a third lens having positive optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, a sixth lens having negative optical power, a seventh lens having positive optical power, and an eighth lens having negative optical power, wherein any two adjacent lenses are spaced apart; and the plurality of spacers comprising: a sixth spacer element disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens, a seventh spacer element disposed on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens, and an eighth fixed element disposed on the image side of the eighth lens and at least partially in contact with the image side surface of the eighth lens; wherein the sixth spacer element... The distance EP67 between the image side of the seventh lens and the object side of the seventh spacer element along the optical axis is less than or equal to the distance EP78 between the image side of the seventh spacer element and the object side of the eighth fixed element along the optical axis; the center thickness of the seventh lens on the optical axis is greater than the center thickness of the other lenses on the optical axis; and the radius of curvature R13 of the object side of the seventh lens, the radius of curvature R14 of the image side of the seventh lens, the radius of curvature R15 of the object side of the eighth lens, the radius of curvature R16 of the image side of the eighth lens, the refractive index N7 of the seventh lens, the refractive index N8 of the eighth lens, the distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis, and the distance EP78 between the image side of the seventh spacer element and the object side of the eighth fixed element along the optical axis satisfy: 0 < [(R13-R14)×N7-(R15-R16)×N8] / (EP78+EP67) < 25.0.

[0007] In one embodiment, the refractive index N6 of the sixth lens, the refractive index N7 of the seventh lens, the radius of curvature R12 of the image-side surface of the sixth lens, the radius of curvature R13 of the object-side surface of the seventh lens, the spacing EP67 between the image-side surface of the sixth spacer and the object-side surface of the seventh spacer along the optical axis, and the air gap T67 between the sixth and seventh lenses on the optical axis satisfy: -100.0 < (N6 + N7) × (R12 - R13) / (EP67 + T67) < 0.

[0008] In one embodiment, the dispersion coefficient V6 of the sixth lens, the dispersion coefficient V7 of the seventh lens, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the inner diameter d6m of the image side of the sixth spacer element, and the inner diameter d7s of the object side of the seventh spacer element satisfy: -20.0 < (V6×f6 + V7×f7) / (d6m + d7s) < 5.0.

[0009] In one embodiment, the sum of the center thicknesses of the sixth and eighth lenses along the optical axis is less than the center thickness of the seventh lens along the optical axis; the combined focal length f78 of the seventh and eighth lenses, the air gap T78 between the seventh and eighth lenses along the optical axis, the center thickness CT8 of the eighth lens along the optical axis, and the distance EP78 between the image-side surface of the seventh spacer element and the object-side surface of the eighth fixed element along the optical axis satisfy: 5.0 <f78 / (T78+CT8+EP78)<25.0。

[0010] In one embodiment, the plurality of spacers further includes: a fifth spacer, disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens; wherein the spacing distance EP56 between the image side of the fifth spacer and the object side of the sixth spacer along the optical axis, the air gap T56 between the fifth and sixth lenses on the optical axis, the dispersion coefficient V5 of the fifth lens, the dispersion coefficient V6 of the sixth lens, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: -10.0<(EP56+T56)×(V5+V6) / (f5-f6)<0.

[0011] In one embodiment, the dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens, 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 d7m of the image-side surface of the seventh spacer element, and the inner diameter d8m of the image-side surface of the eighth fixed element satisfy: (V7×R14+V8×R15) / (d7m+d8m)<-20.0.

[0012] In one embodiment, the radius of curvature R13 of the object side of the seventh lens, the radius of curvature R14 of the image side of the seventh lens, the radius of curvature R15 of the object side of the eighth lens, the radius of curvature R16 of the image side of the eighth lens, the refractive index N7 of the seventh lens, the refractive index N8 of the eighth lens, the distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis, and the distance EP78 between the image side of the seventh spacer element and the object side of the eighth fixed element along the optical axis satisfy: 0 < [(R13-R14)×N7-(R15-R16)×N8] / (EP78+EP67) < 25.0.

[0013] In one embodiment, the plurality of spacer elements further includes: a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; and a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; wherein the distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis, the dispersion coefficient V3 of the third lens, the dispersion coefficient V4 of the fourth lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: 0 <EP34×(V3+V4) / (f3+f4)<10.0。

[0014] In one embodiment, the plurality of spacer elements further includes: a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens; a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens; and a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens; wherein the inner diameter d3m of the image side of the third spacer element, the inner diameter d4m of the image side of the fourth spacer element, the inner diameter d5m of the image side of the fifth spacer element, the combined focal length f34 of the third lens and the fourth lens, and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0 < (d3m + d4m) / f34 + (d4m + d5m) / f45 < 5.0.

[0015] In one embodiment, the plurality of spacer elements further includes: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side of the second lens; a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens; and a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens; wherein the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the distance EP23 between the image side of the second spacer element and the object side of the third spacer element along the optical axis, the distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis, and the maximum thickness CP3 of the third spacer element along the optical axis satisfy: -20.0 < (R5 + R6) / (EP23 + CP3) + (R7 + R8) / (EP34 + CP3) < 1.0.

[0016] In one embodiment, the inner diameter d0m of the image-side end face of the lens barrel, the outer diameter D8m of the image-side surface of the eighth fixing element, the radius of curvature R15 of the object-side surface of the eighth lens, and the radius of curvature R16 of the image-side surface of the eighth lens satisfy: 0 < (d0m + D8m) / (R15 + R16) < 5.0.

[0017] In one embodiment, the radius of curvature R13 of the object-side surface of the seventh lens, the radius of curvature R14 of the image-side surface of the seventh lens, the inner diameter d6m of the image-side surface of the sixth spacer element, the outer diameter D6m of the image-side surface of the sixth spacer element, the inner diameter d7s of the object-side surface of the seventh spacer element, and the outer diameter D7s of the object-side surface of the seventh spacer element satisfy: 3.0 <R13 / (D6m-d6m)-R14 / (D7s-d7s)<15.0。

[0018] In one embodiment, the maximum height L of the lens barrel along the optical axis, the effective focal length f of the optical imaging lens, and the maximum field of view FOV of the optical imaging lens satisfy: L / [f×tan(FOV / 2)]<1.8.

[0019] In one embodiment, the plurality of spacers further includes: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; and a second auxiliary spacer element disposed on the image side of the second spacer element and at least partially in contact with the image side surface of the second spacer element; wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the maximum thickness CP2b of the second auxiliary spacer element along the optical axis satisfy: -50.0 < (f1-f2) / (CP2b+T12+CT2) < -20.0.

[0020] In one embodiment, the plurality of spacer elements further includes: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side of the second lens; a second auxiliary spacer element disposed on the image side of the second spacer element and at least partially in contact with the image side of the second spacer element; a second auxiliary spacer element disposed on the image side of the second auxiliary spacer element and at least partially in contact with the image side of the second auxiliary spacer element; and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side of the third lens; wherein the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d2cm of the image side of the second auxiliary spacer element, and the inner diameter d3m of the image side of the third spacer element satisfy: 20.0 < (f2 + f3) / d2cm + (f2 + f3) / d3m < 30.0.

[0021] In one embodiment, the plurality of spacer elements are made of at least one of plastic or metal.

[0022] The optical imaging lens provided in this application includes eight lenses and multiple spacer elements. By controlling the distance EP67 between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis to be less than or equal to the distance EP78 between the image-side surface of the seventh spacer element and the object-side surface of the eighth fixed element along the optical axis, and by reasonably controlling the parameter relationship between the radius of curvature of the image-side surface of the sixth lens, the radius of curvature of the object-side surface of the eighth lens, the center thickness of the sixth, seventh, and eighth lenses along the optical axis, and the distance between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis, the distance of light passing through the distance between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis can be reduced. This allows the sixth, seventh, and eighth lenses of the lens to be arranged and structured more compactly, thereby shortening the overall height of the lens and enabling the lens to achieve a smaller size while meeting optical parameter requirements. At the same time, it can also balance the distortion generated by the front lens and ensure better image quality. Attached Figure Description

[0023] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0024] Figure 1 A structural layout diagram and schematic diagram of some parameters of an optical imaging lens according to this application are shown;

[0025] Figures 2A to 2C A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown;

[0026] Figures 3A to 3D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 1 of this application are shown respectively.

[0027] Figures 4A to 4C A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown;

[0028] Figures 5A to 5D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 2 of this application are shown respectively.

[0029] Figures 6A to 6C A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown;

[0030] 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 of this application are shown respectively. Detailed Implementation

[0031] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] 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.

[0033] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0034] 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.

[0035] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0036] 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.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. For example, the lens group, lens barrel, and spacer element in the various embodiments of this application can be arbitrarily combined, and it is not limited to the lens group in one embodiment being combined only with the lens barrel, spacer element, etc. of that embodiment.

[0038] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Figure 1 This diagram illustrates the structural layout and schematic diagram of some parameters of an optical imaging lens according to this application. Those skilled in the art will understand that some lens parameters commonly used in the art, such as the center thickness CT1 of the first lens on the optical axis, are not shown. Figure 1 As shown in the figure, Figure 1 The present application only exemplarily illustrates some parameters of the lens barrel and spacer element of an optical imaging lens to facilitate a better understanding of the invention. Figure 1 As shown, d2cm is the inner diameter of the image-side surface of the second auxiliary element, d3m is the inner diameter of the image-side surface of the third spacer element, d4m is the inner diameter of the image-side surface of the fourth spacer element, D6m is the outer diameter of the image-side surface of the sixth spacer element, CP2b is the maximum thickness of the second auxiliary spacer element along the optical axis, EP67 is the distance between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis, EP78 is the distance between the image-side surface of the seventh spacer element and the object-side surface of the eighth fixing element along the optical axis, and L is the maximum height of the lens barrel along the optical axis.

[0039] An optical imaging lens according to an exemplary embodiment of this application includes a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel. The 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 sequentially along the optical axis from the object side to the image side. Any two adjacent lenses among the first lens to the eighth lens may have a spacer distance.

[0040] In an exemplary embodiment, the plurality of spacer elements may include at least one 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, a seventh spacer element, and an eighth fixing element; wherein, the first spacer element is disposed on the image side of the first lens and at least partially in contact with the image side of the first lens, the second spacer element is disposed on the image side of the second lens and at least partially in contact with the image side of the second lens, the third spacer element is disposed on the image side of the third lens and at least partially in contact with the image side of the third lens, the fourth spacer element is disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens, the fifth spacer element is disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens, the sixth spacer element is disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens, the seventh spacer element is disposed on the image side of the seventh lens and at least partially in contact with the image side of the seventh lens, and the eighth fixing element is disposed on the image side of the eighth lens and at least partially in contact with the image side of the eighth lens.

[0041] In an exemplary embodiment, the plurality of spacers may further include auxiliary spacers. Exemplarily, the plurality of spacers may also include a second auxiliary spacer and a second auxiliary spacer. The second auxiliary spacer is positioned on the image side of the second spacer and at least partially contacts the image side of the second spacer. The second auxiliary spacer is positioned on the image side of the second auxiliary spacer and at least partially contacts the image side of the second auxiliary spacer. It should be understood that this application does not specifically limit the number of spacers; any number of spacers may be included between any two lenses, and the entire optical imaging lens may also include any number of spacers. Spacers help the optical imaging lens intercept excess reflective light paths, reducing stray light and ghosting. Adding auxiliary support between the spacers and the lens barrel helps improve problems such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0042] In an exemplary embodiment, the distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis is less than or equal to the distance EP78 between the image side of the seventh spacer element and the object side of the eighth fixing element along the optical axis.

[0043] In an exemplary embodiment, an optical imaging lens according to the present application includes: a lens barrel, a lens group, and a plurality of spacer elements disposed within the lens barrel. Among them, the lens group sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive 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. There is a spacing distance between any two adjacent lenses; and the plurality of spacer elements include: a sixth spacer element disposed on the image side of the sixth lens and at least partially contacting the image side surface of the sixth lens, a seventh spacer element disposed on the image side of the seventh lens and at least partially contacting the image side surface of the seventh lens, and an eighth spacer fixing element disposed on the image side of the eighth lens and at least partially contacting the image side surface of the eighth lens; where the spacing distance EP67 along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element is less than or equal to the spacing distance EP78 along the optical axis between the image side surface of the seventh spacer element and the object side surface of the eighth fixing element; the central thickness of the seventh lens on the optical axis is greater than the central thicknesses of the remaining lenses on the optical axis; the optical imaging lens according to the present application can satisfy: -5.0 < R12 / (CT6 + CT8 + EP67) + R15 / (CT7 + EP67) < -2.0, where R12 is the curvature radius of the image side surface of the sixth lens, R15 is the curvature radius of the object side surface of the eighth lens, EP67 is the spacing distance along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, CT6 is the central thickness of the sixth lens on the optical axis, CT7 is the central thickness of the seventh lens on the optical axis, and CT8 is the central thickness of the eighth lens on the optical axis. By controlling the spacing distance EP67 along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element to be less than or equal to the spacing distance EP78 along the optical axis between the image side surface of the seventh spacer element and the object side surface of the eighth fixing element, and reasonably controlling the parameter relationships among the curvature radius of the image side surface of the sixth lens, the curvature radius of the object side surface of the eighth lens, the central thicknesses of the sixth lens, the seventh lens, and the eighth lens on the optical axis, and the spacing distance EP67 along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, the distance that light passes through along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element can be reduced, making the arrangement and structure of the sixth lens, the seventh lens, and the eighth lens of the lens more compact, thereby shortening the total height of the lens and making the lens smaller in size while meeting the optical parameter requirements; at the same time, by controlling the central thicknesses of the sixth lens, the seventh lens, and the eighth lens on the optical axis, the distortion generated by the front lens can be balanced, ensuring good imaging quality.

[0044] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -100.0 < (N6 + N7) × (R12 - R13) / (EP67 + T67) < 0, where N6 is the refractive index of the sixth lens, N7 is the refractive index of the seventh lens, R12 is the radius of curvature of the image-side surface of the sixth lens, R13 is the radius of curvature of the object-side surface of the seventh lens, EP67 is the distance between the image-side surface of the sixth spacer element and the object-side surface of the seventh spacer element along the optical axis, and T67 is the air gap between the sixth and seventh lenses on the optical axis. More specifically, the optical imaging lens according to this application further satisfies: -75.0 < (N6 + N7) × (R12 - R13) / (EP67 + T67) < -20.0. Satisfying -100.0 < (N6 + N7) × (R12 - R13) / (EP67 + T67) < 0, by constraining the refractive indices of the sixth and seventh lenses, the radius of curvature of the image side of the sixth lens and the radius of curvature of the object side of the seventh lens can be controlled, thereby making the imaging lens structure compact. Controlling the distance along the optical axis between the image side of the sixth spacer element and the object side of the seventh spacer element, as well as the air gap between the sixth and seventh lenses on the optical axis, can ensure the compactness of the lens structure while reducing the sensitivity of the rear lens to the optical system.

[0045] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -20.0 < (V6×f6 + V7×f7) / (d6m + d7s) < 5.0, where V6 is the dispersion coefficient of the sixth lens, V7 is the dispersion coefficient of the seventh lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, d6m is the inner diameter of the image-side surface of the sixth spacer element, and d7s is the inner diameter of the object-side surface of the seventh spacer element. By controlling the dispersion coefficients and effective focal lengths of the sixth and seventh lenses, it is beneficial to increase the image height while improving the overall imaging quality of the system. Reasonably setting the inner diameter of the image-side surface of the sixth spacer element and the inner diameter of the object-side surface of the seventh spacer element can block stray light generated by the light path reflected from the edge mechanism of the effective diameter of the object-side surface of the sixth and seventh lenses and reaching the interior of the lens, thereby improving the imaging quality.

[0046] In an exemplary embodiment, among the first to eighth lenses, the center thickness of the seventh lens on the optical axis is greater than the center thickness of the other lenses on the optical axis, and the sum of the center thicknesses of the sixth and eighth lenses on the optical axis is less than the center thickness of the seventh lens on the optical axis.

[0047] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 5.0 < f78 / (T78 + CT8 + EP78) < 25.0, where f78 is the combined focal length of the seventh lens and the eighth lens, T78 is the air gap between the seventh lens and the eighth lens on the optical axis, CT8 is the central thickness of the eighth lens on the optical axis, and EP78 is the distance between the image side of the seventh spacer element and the object side of the eighth fixed element along the optical axis. By constraining the combined focal length of the seventh lens and the eighth lens, the present application can balance the aberration brought by the front-end lenses and obtain better imaging quality. When T78, CT8, and EP78 satisfy the above formula, the optical imaging lens can have better imaging quality while having a compact structure arrangement, meeting the adjustment of the lens forming process and making the lens easier to process.

[0048] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: -10.0 < (EP56 + T56)×(V5 + V6) / (f5 - f6) < 0, where EP56 is the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, V5 is the dispersion coefficient of the fifth lens, V6 is the dispersion coefficient of the sixth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. By controlling the ratio of the dispersion coefficients of the fifth lens and the sixth lens to the effective focal lengths of the fifth lens and the sixth lens, the present application can control the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis, facilitating the arrangement of the structures of the fifth lens and the sixth lens and enabling stable lens forming.

[0049] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: (V7×R14 + V8×R15) / (d7m + d8m) < -20.0, where V7 is the dispersion coefficient of the seventh lens, V8 is the dispersion coefficient of the eighth lens, R14 is the radius of curvature of the image side of the seventh lens, R15 is the radius of curvature of the object side of the eighth lens, d7m is the inner diameter of the image side of the seventh spacer element, and d8m is the inner diameter of the image side of the eighth fixed element. More specifically, the optical imaging lens according to the present application further satisfies: -30.0 < (V7×R14 + V8×R15) / (d7m + d8m) < -20.0. By controlling the dispersion coefficients of the seventh lens and the eighth lens and the radii of curvature of the seventh lens and the eighth lens, the present application can reduce the inner diameter of the image side of the seventh spacer element and the inner diameter of the object side of the eighth fixed element, which is beneficial to blocking the stray light generated by the internal reflection of the light path in the mechanism of the eighth lens from reaching the inside of the lens and improving the imaging quality.

[0050] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0 < [(R13 - R14) × N7 - (R15 - R16) × N8] / (EP78 + EP67) < 25.0, where R13 is the radius of curvature of the object side surface of the seventh lens, R14 is the radius of curvature of the image side surface of the seventh lens, R15 is the radius of curvature of the object side surface of the eighth lens, R16 is the radius of curvature of the image side surface of the eighth lens, N7 is the refractive index of the seventh lens, N8 is the refractive index of the eighth lens, EP67 is the distance along the optical axis between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element, and EP78 is the distance along the optical axis between the image side surface of the seventh spacer element and the object side surface of the eighth fixed element. More specifically, the optical imaging lens according to the present application may further satisfy: 10.0 < [(R13 - R14) × N7 - (R15 - R16) × N8] / (EP78 + EP67) < 22.0. By controlling R13, R14, N7, R15, R16, and N8 in the present application, it is beneficial to improve the adjustability of the seventh lens and the eighth lens in terms of structure while ensuring that the light passing amount of the optical system meets the optical requirements, and reduce the sensitivity of the seventh lens and the eighth lens in the system. When EP78 and EP67 satisfy the above formula, it can ensure that the lens structure is compact and is beneficial to the stable molding of the lens.

[0051] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0 < EP34 × (V3 + V4) / (f3 + f4) < 10.0, where EP34 is the distance along the optical axis between the image side surface of the third spacer element and the object side surface of the fourth spacer element, V3 is the dispersion coefficient of the third lens, V4 is the dispersion coefficient of the fourth lens, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens. By controlling the ratio of the dispersion coefficients of the third lens and the fourth lens to the effective focal lengths of the third lens and the fourth lens in the present application, the distance along the optical axis between the image side surface of the third spacer element and the object side surface of the fourth spacer element can be controlled, enabling the third lens to be compactly arranged in the structure, which is beneficial to the stability of the lens molding.

[0052] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 0 < (d3m + d4m) / f34 + (d4m + d5m) / f45 < 5.0, where d3m is the inner diameter of the image-side surface of the third spacer element, d4m is the inner diameter of the image-side surface of the fourth spacer element, d5m is the inner diameter of the image-side surface of the fifth spacer element, f34 is the combined focal length of the third and fourth lenses, and f45 is the combined focal length of the fourth and fifth lenses. By adjusting the combined focal length of the third and fourth lenses, and in conjunction with adjusting the combined focal length of the fourth and fifth lenses, a smaller value can be obtained for the inner diameters of the image-side surfaces of the third, fourth, and fifth spacers. This allows for a more compact structure of the optical imaging lens and avoids stray light generated by total internal reflection within the third, fourth, and fifth lens mechanisms.

[0053] In an exemplary embodiment, the optical imaging lens according to this application can satisfy: -20.0<(R5+R6) / (EP23+CP3)+(R7+R8) / (EP34+CP3)<1.0, where R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, EP23 is the distance between the image side of the second spacer element and the object side of the third spacer element along the optical axis, EP34 is the distance between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis, and CP3 is the maximum thickness of the third spacer element along the optical axis. By controlling the curvature radii of the object side and image side of the third lens, and the curvature radii of the object side and image side of the fourth lens, the distances along the optical axis between the side side of the second spacer element and the object side of the third spacer element, as well as the distances along the optical axis between the image side of the third spacer element and the object side of the fourth spacer element, can be controlled. This makes the structure of the third lens compact, ensures the strength of the lens forming, and avoids problems such as lens quality degradation caused by assembly deformation.

[0054] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 0 < (d0m + D8m) / (R15 + R16) < 5.0, where d0m is the inner diameter of the image-side end face of the lens barrel, D8m is the outer diameter of the image-side face of the eighth fixing element, R15 is the curvature radius of the object-side face of the eighth lens, and R16 is the curvature radius of the image-side face of the eighth lens. Satisfying 0 < (d0m + D8m) / (R15 + R16) < 5.0, controlling the curvature radii of the object-side face and the image-side face of the eighth lens to compensate for the spherical aberration generated by the lens, and controlling the outer diameter of the image-side face of the eighth fixing element and the inner diameter of the image-side end face of the lens barrel, so that there is a uniformly distributed space for each lens structure in the optical imaging lens, thereby improving the assembly stability in production.

[0055] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: 3.0 < R13 / (D6m - d6m) - R14 / (D7s - d7s) < 15.0, where R13 is the curvature radius of the object-side face of the seventh lens, R14 is the curvature radius of the image-side face of the seventh lens, d6m is the inner diameter of the image-side face of the sixth spacer element, D6m is the outer diameter of the image-side face of the sixth spacer element, d7s is the inner diameter of the object-side face of the seventh spacer element, and D7s is the outer diameter of the object-side face of the seventh spacer element. Satisfying 3.0 < R13 / (D6m - d6m) - R14 / (D7s - d7s) < 15.0, by controlling the curvature radii of the object-side face and the image-side face of the seventh lens, the outer diameter and the outer diameter of the image-side face of the sixth spacer element, and the inner diameter and the outer diameter of the object-side face of the seventh spacer element can be controlled, so as to avoid stray light generated by lens reflection in the lens when excessive light passes through the seventh lens.

[0056] In an exemplary embodiment, the optical imaging lens according to the present application can satisfy: L / [f × tan(FOV / 2)] < 1.8, where L is the maximum height of the lens barrel along the optical axis direction, f is the effective focal length of the optical imaging lens, and FOV is the maximum field angle of the optical imaging lens. Satisfying L / [f × tan(FOV / 2)] < 1.8, controlling the effective focal length and the maximum field angle of the optical imaging lens can adjust the overall height of the lens and effectively reduce the size of the imaging lens; it is beneficial to cooperate with imaging lens barrels of various sizes.

[0057] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -50.0 < (f1-f2) / (CP2b+T12+CT2) < -20.0, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, CT2 is the center thickness of the second lens on the optical axis, T12 is the air gap between the first and second lenses on the optical axis, and CP2b is the maximum thickness of the second auxiliary spacer element along the optical axis. By satisfying -50.0 < (f1-f2) / (CP2b+T12+CT2) < -20.0, and by controlling the effective focal lengths of the first and second lenses, adjusting the center thickness of the second lens on the optical axis, the air gap between the first and second lenses on the optical axis, and the maximum thickness of the second auxiliary spacer element along the optical axis, the first and second lenses meet the molding process requirements, avoiding appearance problems during molding, deformation during assembly, and resulting in poor quality.

[0058] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 20.0 < (f2 + f3) / d2cm + (f2 + f3) / d3m < 30.0, where f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, d2cm is the inner diameter of the image-side surface of the second auxiliary spacer element, and d3m is the inner diameter of the image-side surface of the third spacer element. This application, by controlling the effective focal lengths of the second and third lenses, the inner diameters of the image-side surfaces of the second and third auxiliary spacers, avoids stray light generated by reflection from the surface of the second auxiliary spacer element, thus preventing it from affecting image quality.

[0059] In an exemplary embodiment, the optical imaging lens according to this application includes: a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel, wherein the lens group sequentially includes, from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens with negative optical power, wherein any two adjacent lenses are spaced apart; and the plurality of spacers includes: a sixth spacer disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens, a seventh spacer disposed on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens, and a spacer disposed on the image side of the eighth lens. An eighth fixed element that is in at least partial contact with the image side of the mirror and the image side of the eighth lens; wherein the distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis is less than or equal to the distance EP78 between the image side of the seventh spacer element and the object side of the eighth fixed element along the optical axis; the center thickness of the seventh lens on the optical axis is greater than the center thickness of the other lenses on the optical axis; and the dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens, the radius of curvature R14 of the image side of the seventh lens, the radius of curvature R15 of the object side of the eighth lens, the inner diameter d7m of the image side of the seventh spacer element and the inner diameter d8m of the image side of the eighth fixed element satisfy: (V7×R14+V8×R15) / (d7m+d8m)<-20.0. This application controls the distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis to be less than or equal to the distance EP78 between the image side of the seventh spacer element and the object side of the eighth fixed element along the optical axis. By reasonably controlling the relationship between the dispersion coefficients of the seventh and eighth lenses, the radii of curvature of the seventh and eighth lenses, and the inner diameters of the seventh spacer element and the eighth fixed element, the inner diameters of the image side of the seventh spacer element and the object side of the eighth fixed element can be reduced. This is beneficial for blocking stray light generated by the light path reflected from the mechanism of the eighth lens and reaching the inside of the lens, thereby improving the imaging quality.

[0060] In an exemplary embodiment, the optical imaging lens according to this application includes: a lens barrel and a lens group and a plurality of spacer elements disposed within the lens barrel, wherein the lens group comprises, along the optical axis from the object side to the image side, a first lens having negative optical power, a second lens having positive optical power, a third lens having positive optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, a sixth lens having negative optical power, a seventh lens having positive optical power, and an eighth lens having negative optical power, wherein any two adjacent lenses are spaced apart; and the plurality of spacer elements include: a sixth spacer element disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens, a seventh spacer element disposed on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens, and an eighth fixing element disposed on the image side of the eighth lens and at least partially in contact with the image side surface of the eighth lens; wherein the image side of the sixth spacer element... The distance EP67 between the object-side surface of the seventh spacer and the object-side surface of the seventh spacer is less than or equal to the distance EP78 between the image-side surface of the seventh spacer and the object-side surface of the eighth fixed element along the optical axis; the center thickness of the seventh lens on the optical axis is greater than the center thickness of the other lenses on the optical axis; and the radius of curvature R13 of the object-side surface of the seventh lens, 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 radius of curvature R16 of the image-side surface of the eighth lens, the refractive index N7 of the seventh lens, the refractive index N8 of the eighth lens, the distance EP67 between the image-side surface of the sixth spacer and the object-side surface of the seventh spacer and the distance EP78 between the image-side surface of the seventh spacer and the object-side surface of the eighth fixed element along the optical axis satisfy: 0 < [(R13-R14)×N7-(R15-R16)×N8] / (EP78+EP67) < 25.0. This application controls the distance EP67 between the image side of the sixth spacer element and the object side of the seventh spacer element along the optical axis to be less than or equal to the distance EP78 between the image side of the seventh spacer element and the object side of the eighth fixed element along the optical axis. By reasonably controlling the relationship between R13, R14, N7, R15, R16, N8, EP78, and EP67, it is beneficial to improve the structural adjustability of the seventh and eighth lenses while ensuring that the light transmission of the optical system meets the optical requirements, and to reduce the sensitivity of the seventh and eighth lenses in the system. EP78 and EP67 satisfy the above formula, which can ensure a compact lens structure and facilitate stable lens forming.

[0061] In an exemplary embodiment, the multiple spacer elements are made of at least one of plastic or metal materials; that is, the multiple spacer elements can be made of any combination of one or more of plastic or metal materials. The selection and combination of plastic and metal materials provides multiple options for improving the stability of the lens during assembly. Different materials exhibit different performance in lens reliability, and the selection of multiple materials can selectively reduce costs, balance image quality, and ensure that imaging requirements are met while satisfying customer needs.

[0062] In an exemplary embodiment, the first lens may have negative optical power, the second lens may have positive optical power, the third lens may have positive 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, and the eighth lens may have negative optical power.

[0063] In embodiments of this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface; that is, at least one mirror surface from the object-side surface of the first lens to the image-side surface of the eighth lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, the object-side and image-side surfaces of all lenses from the first to the eighth lens are aspherical mirror surfaces.

[0064] In an exemplary embodiment, the optical imaging lens may further include a color filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0065] The optical imaging lens according to the above embodiments of this application can employ multiple lenses, such as the eight lenses mentioned above. By rationally allocating the optical power, surface shape, and arrangement of the spacers of each lens, the range of each lens-tube engagement is made more uniform, enhancing the light-gathering ability and improving the imaging quality of the ultra-thin, large-image-plane imaging lens. However, those skilled in the art should understand that the number of lenses constituting the optical imaging lens can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0066] 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.

[0067] Example 1

[0068] The following is for reference Figures 2A to 3D The optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 according to Embodiment 1 of this application are described. Figures 2A to 2C Schematic diagrams of the optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 according to Embodiment 1 of this application are shown respectively.

[0069] like Figures 2A to 2C As shown, optical imaging lenses 1001, 1002 and 1003 each include a lens barrel P0, lens groups E1 to E8 and multiple spacer elements P1 to P8.

[0070] like Figures 2A to 2C As shown, optical imaging lenses 1001, 1002, and 1003 employ the same lens group, which, from the object side to the image side, sequentially 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. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17 (not shown).

[0071] Table 1 shows the basic parameters of the lens groups of optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 in Embodiment 1, wherein the units of radius of curvature, thickness and effective focal length are all millimeters (mm).

[0072]

[0073]

[0074] Table 1

[0075] In Embodiment 1, 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:

[0076]

[0077] 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 each aspherical mirror S1-S16 in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0078]

[0079] Table 2

[0080] like Figures 2A to 2C As shown, optical imaging lenses 1001, 1002 and 1003 each include at least 8 spacer elements, namely, 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, a seventh spacer element P7 and an eighth fixed element P8. The first spacer element P1 is placed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is placed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is placed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is placed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is placed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth spacer element P6 is placed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is placed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens; the eighth fixing element P8 is placed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens.

[0081] like Figures 2A to 2C As shown, optical imaging lenses 1001, 1002, and 1003 all further include a second auxiliary spacer element P2b and a second auxiliary spacer element P2c. The second auxiliary spacer element P2b is located on the image side of the second spacer element and is at least partially in contact with the image side of the second spacer element, and the second auxiliary spacer element P2c is located on the image side of the second auxiliary spacer element and is at least partially in contact with the image side of the second auxiliary spacer element.

[0082] like Figure 2A and Figure 2CAs shown, the optical imaging lens 1001 and the optical imaging lens 1003 further include a first auxiliary spacing element P1b and a first auxiliary spacing element P1c. The first auxiliary spacing element P1b is located on the image side of the first spacing element and is at least partially in contact with the image side of the first spacing element, and the first auxiliary spacing element P1c is located on the image side of the first auxiliary spacing element and is at least partially in contact with the image side of the first auxiliary spacing element.

[0083] The aforementioned spacer element can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003.

[0084] Figure 3A The on-axis chromatic aberration curves of optical imaging lenses 1001, 1002 and 1003 of Embodiment 1 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3B The astigmatism curves of optical imaging lenses 1001, 1002 and 1003 of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curves of optical imaging lenses 1001, 1002 and 1003 of Embodiment 1 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 3D The magnification chromatic aberration curves of optical imaging lenses 1001, 1002, and 1003 of Embodiment 1 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 3A to 3D It can be seen that the optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 given in Example 1 can achieve good imaging quality.

[0085] Example 2

[0086] The following is for reference Figures 4A to 5D The optical imaging lens 2001, optical imaging lens 2002, and optical imaging lens 2003 according to Embodiment 2 of this application are described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figures 4A to 4C Schematic diagrams of the optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 according to Embodiment 2 of this application are shown respectively.

[0087] like Figures 4A to 4C As shown, optical imaging lenses 2001, 2002 and 2003 each include a lens barrel P0, lens groups E1 to E8 and multiple spacer elements P1 to P8.

[0088] like Figures 4A to 4C As shown, optical imaging lenses 2001, 2002, and 2003 employ the same lens group, which, from the object side to the image side, sequentially 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. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17 (not shown).

[0089] Table 3 shows the basic parameters of the lens groups of optical imaging lenses 2001, 2002 and 2003 in Embodiment 2, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 4-1 and 4-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0090]

[0091] Table 3

[0092]

[0093]

[0094] Table 4-1

[0095] Face number A18 A20 A22 A24 A26 A28 A30 S1 -2.3445E-05 1.5184E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -1.0306E-06 6.6328E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -9.7007E-06 -1.5055E-05 3.2799E-06 8.0310E-06 8.8288E-06 -4.3556E-06 -2.8194E-07 S4 9.6891E-07 -7.6172E-06 7.1541E-06 7.3288E-06 -3.6956E-06 -8.3113E-06 -7.9217E-06 S5 -4.4545E-06 -9.8697E-07 5.7719E-08 3.1574E-08 1.6269E-08 8.2133E-09 4.0474E-09 S6 -3.1795E-05 3.2426E-06 -5.1426E-08 -4.2674E-08 -1.9983E-08 -1.2104E-08 -5.9605E-09 S7 -7.7491E-06 -2.4433E-06 -6.6620E-09 -3.6898E-10 1.0106E-09 1.0519E-09 8.2367E-10 S8 -5.6195E-07 6.4819E-08 -1.5942E-07 -6.7075E-08 -8.4516E-08 -6.3288E-08 -2.9416E-08 S9 -8.3758E-06 -2.1970E-06 -1.0487E-08 -7.9132E-10 -2.1016E-10 4.3302E-10 5.0213E-10 S10 -2.0392E-05 -1.6535E-06 8.4002E-08 3.3849E-08 2.3372E-08 1.3908E-08 8.2033E-09 S11 -1.0662E-04 3.3367E-05 6.1043E-06 1.8547E-06 7.9921E-07 -1.0493E-07 4.8108E-08 S12 -2.2828E-04 2.3713E-05 -1.0129E-06 -2.1564E-07 1.5078E-07 5.5171E-07 1.9640E-07 S13 1.1905E-05 -5.5642E-06 1.6381E-05 2.5904E-06 1.3474E-05 -1.3888E-06 5.8902E-06 S14 2.8210E-05 -1.0965E-05 1.4403E-06 -1.8282E-06 5.0965E-06 6.6837E-06 -1.7668E-06 S15 4.1495E-05 1.0268E-05 3.7019E-05 -1.8462E-05 2.7748E-06 -3.6586E-06 9.9646E-06 S16 2.4480E-04 1.8127E-05 -1.3050E-05 -4.8648E-06 -1.9829E-06 2.1502E-06 1.4717E-06

[0096] Table 4-2

[0097] like Figures 4A to 4CAs shown, optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 each include at least 8 spacer elements, namely, first spacer element P1, second spacer element P2, third spacer element P3, fourth spacer element P4, fifth spacer element P5, sixth spacer element P6, seventh spacer element P7 and eighth fixed element P8. The first spacer element P1 is placed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is placed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is placed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is placed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is placed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth spacer element P6 is placed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is placed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens; the eighth fixing element P8 is placed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens.

[0098] like Figure 4A and Figure 4B As shown, both optical imaging lens 2001 and optical imaging lens 2002 also include multiple auxiliary spacing elements, such as first auxiliary spacing element P1b, first auxiliary spacing element P1c, second auxiliary spacing element P2b, second auxiliary spacing element P2c, fifth auxiliary spacing element P5b and fifth auxiliary spacing element P5c.

[0099] like Figure 4C As shown, the optical imaging lens 2003 also includes a second auxiliary spacer element P2b and a second auxiliary spacer element P2c.

[0100] The aforementioned spacer element can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging lenses 2001, 2002, and 2003.

[0101] Figure 5A The on-axis chromatic aberration curves of optical imaging lenses 2001, 2002 and 2003 of Embodiment 2 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5B The astigmatism curves of optical imaging lenses 2001, 2002 and 2003 of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5CThe distortion curves of optical imaging lenses 2001, 2002 and 2003 of Embodiment 2 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curves of optical imaging lenses 2001, 2002, and 2003 of Embodiment 2 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 5A to 5D It can be seen that the optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 given in Example 2 can achieve good imaging quality.

[0102] Example 3

[0103] The following is for reference Figures 6A to 7D The optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 according to Embodiment 3 of this application are described. Figures 6A to 6C Schematic diagrams of the optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 according to Embodiment 3 of this application are shown respectively.

[0104] like Figures 6A to 6C As shown, optical imaging lenses 3001, 3002 and 3003 each include a lens barrel P0, lens groups E1 to E8 and multiple spacer elements P1 to P8.

[0105] like Figures 6A to 6C As shown, optical imaging lenses 3001, 3002, and 3003 employ the same lens group, which, from the object side to the image side, sequentially 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. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17 (not shown).

[0106] Table 5 shows the basic parameters of the lens groups of optical imaging lenses 3001, 3002, and 3003 in Embodiment 3, wherein the units of radius of curvature, thickness, and effective focal length are millimeters (mm). Tables 6-1 and 6-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0107]

[0108] Table 5

[0109] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.0798E+00 -9.2499E-02 1.7513E-02 -2.1242E-03 1.1991E-03 -2.7786E-04 2.8246E-04 S2 7.5242E-01 -5.2363E-02 5.4593E-03 -1.2086E-03 5.8920E-04 -2.4237E-04 5.6433E-05 S3 -1.2623E-01 1.0050E-02 -1.7033E-03 5.4629E-04 -1.4130E-04 6.0686E-05 -2.2174E-05 S4 -7.5006E-01 9.8491E-02 -1.5402E-02 3.0713E-03 -6.3409E-04 1.7303E-04 -2.5946E-04 S5 -7.8874E-01 7.1500E-02 -1.8046E-02 -5.3000E-04 -8.8986E-04 -1.0032E-05 -2.3465E-04 S6 -4.5492E-01 5.4778E-02 4.4525E-03 -5.8275E-03 -3.7809E-04 2.1920E-04 3.0054E-04 S7 -1.3123E-01 1.8027E-02 5.0693E-03 -2.4103E-04 2.2132E-04 -1.0467E-04 9.0910E-05 S8 -8.8336E-02 -1.2043E-03 -2.0249E-03 2.4707E-03 9.6663E-04 1.4635E-05 -1.5769E-04 S9 -1.0460E+00 1.6000E-01 -8.3341E-03 -1.3266E-03 1.6401E-03 2.0606E-04 4.4814E-04 S10 -8.9007E-01 1.2942E-01 -6.4687E-03 -1.2885E-03 8.2770E-04 -4.4092E-04 5.1473E-04 S11 8.0342E-01 -2.2199E-01 1.1171E-02 -8.4522E-03 2.3429E-03 -1.8523E-03 1.2004E-03 S12 1.8973E+00 -4.5428E-02 9.4044E-02 2.6276E-02 1.0735E-02 3.3753E-03 4.1032E-03 S13 -7.5607E-01 1.2736E-01 -1.1254E-02 1.6493E-02 -1.4079E-03 4.9226E-04 -3.7896E-04 S14 -2.5562E-01 -9.1825E-02 6.1054E-03 5.2247E-03 5.2650E-03 3.9684E-04 -8.0235E-04 S15 -7.4042E-01 -1.4316E-02 -2.6198E-02 -8.2935E-03 -2.4292E-03 -3.4477E-04 -4.5294E-04 S16 -2.0541E+00 2.0734E-01 -5.9204E-02 1.4427E-02 -2.8165E-03 9.0270E-04 -3.3111E-04

[0110] Table 6-1

[0111]

[0112]

[0113] Table 6-2

[0114] like Figures 6A to 6C As shown, optical imaging lenses 3001, 3002 and 3003 each include at least 8 spacer elements, namely, 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, a seventh spacer element P7 and an eighth fixed element P8. The first spacer element P1 is placed on the image side of the first lens and is at least partially in contact with the image side surface of the first lens; the second spacer element P2 is placed on the image side of the second lens and is at least partially in contact with the image side surface of the second lens; the third spacer element P3 is placed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the fourth spacer element P4 is placed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the fifth spacer element P5 is placed on the image side of the fifth lens and is at least partially in contact with the image side surface of the fifth lens; the sixth spacer element P6 is placed on the image side of the sixth lens and is at least partially in contact with the image side surface of the sixth lens; the seventh spacer element P7 is placed on the image side of the seventh lens and is at least partially in contact with the image side surface of the seventh lens; the eighth fixing element P8 is placed on the image side of the eighth lens and is at least partially in contact with the image side surface of the eighth lens.

[0115] like Figure 6A As shown, the optical imaging lens 3001 also includes: a first auxiliary spacing element P1b, a first auxiliary spacing element P1c, a second auxiliary spacing element P2b, a second auxiliary spacing element P2c, a fourth auxiliary spacing element P4b, and a fourth auxiliary spacing element P4c.

[0116] like Figure 6BAs shown, the optical imaging lens 3002 also includes: a first auxiliary spacing element P1b, a first auxiliary spacing element P1c, a second auxiliary spacing element P2b, a second auxiliary spacing element P2c, a fifth auxiliary spacing element P5b, and a fifth auxiliary spacing element P5c.

[0117] like Figure 6C As shown, the optical imaging lens 3003 also includes: a second auxiliary spacing element P2b, a second auxiliary spacing element P2c, a fifth auxiliary spacing element P5b, and a fifth auxiliary spacing element P5c.

[0118] The aforementioned spacer element can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging lenses 3001, 3002, and 3003.

[0119] Figure 7A The on-axis chromatic aberration curves of optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B The astigmatism curves of optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C The distortion curves of optical imaging lenses 3001, 3002 and 3003 of Embodiment 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 7D The magnification chromatic aberration curves of optical imaging lenses 3001, 3002, and 3003 of Embodiment 3 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 7A to 7D It can be seen that the optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 given in Example 3 can achieve good imaging quality.

[0120] Table 7 shows the basic parameters of the lens group, spacer element, and lens barrel of the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002, and 3003 of Examples 1 to 3.

[0121]

[0122]

[0123] Table 7

[0124] In summary, the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Examples 1 to 3 satisfy the relationship shown in Table 8.

[0125]

[0126] Table 8

[0127] 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.

[0128] 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, Comprising: a lens barrel, and a plurality of spacer elements disposed in the lens barrel, wherein, the lens group comprises, in order from the object side to the image side along the optical axis, a first lens having negative refractive power, a second lens having positive refractive power, a third lens having positive 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, wherein any two adjacent lenses have a separation distance therebetween; and the plurality of spacer elements comprises a sixth spacer element disposed on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens, a seventh spacer element disposed on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens, and an eighth fixed element disposed on the image side of the eighth lens and at least partially in contact with the image side surface of the eighth lens; wherein the separation distance EP67 between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis is less than or equal to the separation distance EP78 between the image side surface of the seventh spacer element and the object side surface of the eighth fixed element along the optical axis; the central thickness of the seventh lens on the optical axis is greater than the central thickness of the remaining lenses on the optical axis; and the radius of curvature R12 of the image side surface of the sixth lens, the radius of curvature R15 of the object side surface of the eighth lens, the separation distance EP67 between the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis, the central thickness CT6 of the sixth lens on the optical axis, the central thickness CT7 of the seventh lens on the optical axis, and the central thickness CT8 of the eighth lens on the optical axis satisfy: -4.85 ≤ R12 / (CT6+CT8+EP67)+R15 / (CT7+EP67) ≤ -2.30; the combined focal length f78 of the seventh lens and the eighth lens, the air separation T78 of the seventh lens and the eighth lens on the optical axis, the central thickness CT8 of the eighth lens on the optical axis, and the separation distance EP78 between the image side surface of the seventh spacer element and the object side surface of the eighth fixed element along the optical axis satisfy: 9.68 ≤ f78 / (T78+CT8+EP78) ≤ 23.35; the object side surface of the first lens is concave, and the image side surface is convex; 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 sixth lens is concave, and the image side surface is convex; the object side surface of the seventh lens is convex, and the image side surface is convex; the object side surface of the eighth lens is concave, and the image side surface is concave; the number of lenses having refractive power in the optical imaging lens is eight. 2.The optical imaging lens according to claim 1, wherein, The refractive index N6 of the sixth lens, the refractive index N7 of the seventh lens, the radius of curvature R12 of the image side surface of the sixth lens, the radius of curvature R13 of the object side surface of the seventh lens, the interval distance EP67 of the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis direction, and the air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: -70.42 ≤ (N6+N7)×(R12-R13) / (EP67+T67) ≤ -20.

87. 3.The optical imaging lens according to claim 1, wherein, The dispersion coefficient V6 of the sixth lens, the dispersion coefficient V7 of the seventh lens, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, the inner diameter d6m of the image side surface of the sixth spacer element, and the inner diameter d7s of the object side surface of the seventh spacer element satisfy: -12.00 ≤ (V6×f6+V7×f7) / (d6m+d7s) ≤ 2.

03.

4. The optical imaging lens according to claim 1, wherein a sum of central thicknesses of the sixth lens and the eighth lens on the optical axis is less than a central thickness of the seventh lens on the optical axis. The plurality of spacer elements further comprises:

5. The optical imaging lens according to claim 1, characterized in that, A fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; wherein The interval distance EP56 of the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis direction, the air interval T56 of the fifth lens and the sixth lens on the optical axis, the dispersion coefficient V5 of the fifth lens, the dispersion coefficient V6 of the sixth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: -5.79 ≤ (EP56+T56)×(V5+V6) / (f5-f6) ≤ -1.

17. The dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens, 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 d7m of the image side surface of the seventh spacer element, and the inner diameter d8m of the image side surface of the eighth spacer element satisfy: -29.52 ≤ (V7×R14+V8×R15) / (d7m+d8m) ≤ -25.

06. 6.The optical imaging lens according to claim 1, wherein, The radius of curvature R13 of the object side surface of the seventh lens, 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 radius of curvature R16 of the image side surface of the eighth lens, the refractive index N7 of the seventh lens, the refractive index N8 of the eighth lens, the distance EP67 of the image side surface of the sixth spacer element and the object side surface of the seventh spacer element along the optical axis direction, and the distance EP78 of the image side surface of the seventh spacer element and the object side surface of the eighth spacer element along the optical axis direction satisfy: 11.71 ≤ [(R13-R14)×N7-(R15-R16)×N8] / (EP78+EP67) ≤ 20.

83. 7.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprises: 8.The optical imaging lens according to claim 1, wherein, A fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; wherein a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; wherein a distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction, a dispersion coefficient V3 of the third lens, a dispersion coefficient V4 of the fourth lens, an effective focal length f3 of the third lens, and an effective focal length f4 of the fourth lens satisfy: 1.99≤EP34×(V3+V4) / (f3+f4)≤4.

77. 9.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprise: a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; a fifth spacer element disposed on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; wherein an inner diameter d3m of the image side surface of the third spacer element, an inner diameter d4m of the image side surface of the fourth spacer element, an inner diameter d5m of the image side surface of the fifth spacer element, a combined focal length f34 of the third lens and the fourth lens, and a combined focal length f45 of the fourth lens and the fifth lens satisfy: 2.83≤(d3m+d4m) / f34+(d4m+d5m) / f45≤3.

05. 10.The optical imaging lens according to claim 1, wherein, The plurality of spacer elements further comprise: a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; wherein a radius of curvature R5 of the object side surface of the third lens, a radius of curvature R6 of the image side surface of the third lens, a radius of curvature R7 of the object side surface of the fourth lens, a radius of curvature R8 of the image side surface of the fourth lens, a distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction, a distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction, and a maximum thickness CP3 of the third spacer element along the optical axis direction satisfy: -12.23≤(R5+R6) / (EP23+CP3)+(R7+R8) / (EP34+CP3)≤0.

66.

11. The optical imaging lens according to claim 1, characterized in that, an inner diameter d0m of the image side end surface of the lens barrel, an outer diameter D8m of the image side surface of the eighth fixed element, a radius of curvature R15 of the object side surface of the eighth lens, and a radius of curvature R16 of the image side surface of the eighth lens satisfy: 2.41≤(d0m+D8m) / (R15+R16)≤3.

76. 12.The optical imaging lens according to claim 1, wherein, A radius of curvature R13 of an object side surface of the seventh lens, a radius of curvature R14 of an image side surface of the seventh lens, an inner diameter d6m of an image side surface of the sixth spacer element, an outer diameter D6m of the image side surface of the sixth spacer element, an inner diameter d7s of an object side surface of the seventh spacer element, and an outer diameter D7s of the object side surface of the seventh spacer element satisfy: 5.34≤R13 / (D6m-d6m)-R14 / (D7s-d7s)≤13.

24.

13. The optical imaging lens according to claim 1, characterized in that, A maximum height L of the lens barrel along the optical axis direction, an effective focal length f of the optical imaging lens, and a maximum field of view angle FOV of the optical imaging lens satisfy: 1.65≤L / [f×tan(FOV / 2)]<1.

8.

14. The optical imaging lens according to any of claims 1-9, 11-13, wherein, The plurality of spacer elements further comprise: a second spacer element disposed on an image side of the second lens and at least partially in contact with an image side surface of the second lens; a second auxiliary spacer element disposed on an image side of the second spacer element and at least partially in contact with an image side surface of the second spacer element; wherein an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, a central thickness CT2 of the second lens on the optical axis, an air separation T12 of the first lens and the second lens on the optical axis, a maximum thickness CP2b of the second auxiliary spacer element along the optical axis direction satisfy: -37.67≤(f1-f2) / (CP2b+T12+CT2)≤-33.

00.

15. The optical imaging lens according to any of claims 1-7, 11-13, wherein, The plurality of spacer elements further comprise: a second spacer element disposed on an image side of the second lens and at least partially in contact with an image side surface of the second lens; a second auxiliary spacer element disposed on an image side of the second spacer element and at least partially in contact with an image side surface of the second spacer element; a second secondary auxiliary spacer element disposed on an image side of the second auxiliary spacer element and at least partially in contact with an image side surface of the second auxiliary spacer element; and a third spacer element disposed on an image side of the third lens and at least partially in contact with an image side surface of the third lens; wherein an effective focal length f2 of the second lens, an effective focal length f3 of the third lens, an inner diameter d2cm of an image side surface of the second secondary auxiliary spacer element, and an inner diameter d3m of an image side surface of the third spacer element satisfy: 23.47≤(f2+f3) / d2cm+(f2+f3) / d3m≤28.

06.

16. The optical imaging lens according to any of claims 1-13, characterized in that, A material of the plurality of spacer elements is at least one of a plastic material or a metal material.

Images