Optical imaging lens

Abstract

The application provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens set and a spacer element set accommodated in the lens barrel; the lens set comprises, in sequence from the object side to the image side along the optical axis, 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; wherein the third lens has a negative refractive power, and both the object side surface and the image side surface of the third lens are concave; the spacer element set comprises a second spacer element arranged between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer element arranged between the third lens and the fourth lens and in contact with the image side surface of the third lens; the optical imaging lens satisfies: -0.05≤T23 / f23<0.00; 1.05d3s / d2s<1.30; and 0.20<(CP2+EP23) / d2s<0.30.

Description

Technical Field

[0001] This application relates to the field of optical device technology, and in particular to an optical imaging lens. Background Technology

[0002] With the rapid development of optical imaging lens technology, people's requirements for image quality in photography and videography are also increasing. At present, there is a wide variety of lenses available for photography and videography on the market. Among them, multi-element fixed-focus lenses have become the preferred solution for photography and videography equipment due to their advantages in image quality, portability, and durability.

[0003] However, during photography or videography, stray light can lead to loss of detail, color distortion, and even unnecessary glare or light spots, resulting in a decrease in the visual effect of the work. This is especially true in multi-element prime lenses, where the increased number of lens elements, if the shape of the lens elements and the gaps between them are not properly set, will cause light to be reflected and refracted multiple times inside the lens, exacerbating the generation of stray light and causing a decrease in the image quality of the lens. Summary of the Invention

[0004] One advantage of this application is that it provides an optical imaging lens that can solve the problem of stray light inside the lens caused by unreasonable lens shape and gap setting between lenses in traditional multi-element lenses.

[0005] On one hand, this application provides an optical imaging lens, including a lens barrel and a lens group and a spacer element group housed 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; wherein, the third lens has negative optical power, and both the object side and the image side of the third lens are concave; the spacer element group includes a second spacer element placed between the second lens and the third lens and in contact with the image side of the second lens, and a third spacer element placed between the third lens and the fourth lens and in contact with the image side of the third lens; the optical imaging lens satisfies:

[0006] -0.05≤T23 / f23<0.00;

[0007] 1.05 < d3s / d2s < 1.30; and

[0008] 0.20 < (CP2 + EP23) / d2s < 0.30;

[0009] Wherein, T23 is the air gap between the second lens and the third lens on the optical axis, f23 is the combined focal length of the second lens and the third lens, d2s is the inner diameter of the object side of the second spacer element perpendicular to the optical axis, d3s is the inner diameter of the object side of the third spacer element perpendicular to the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis, and 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.

[0010] In some embodiments of this application, the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical imaging lens satisfies:

[0011] 1.95 < d4s / DT42 < 2.15;

[0012] Wherein, d4s is the inner diameter of the object-side surface of the fourth spacer element perpendicular to the optical axis, and DT42 is the maximum effective radius of the image-side surface of the fourth lens.

[0013] In some embodiments of this application, the optical imaging lens satisfies:

[0014] 0.55<|SAG42| / |SAG41|<2.75;

[0015] Wherein, SAG42 is the displacement along the optical axis from the intersection of the image-side surface of the fourth lens and the optical axis to the non-effective diameter region of the image-side surface of the fourth lens, and SAG41 is the displacement along the optical axis from the intersection of the object-side surface of the fourth lens and the optical axis to the non-effective diameter region of the object-side surface of the fourth lens.

[0016] In some embodiments of this application, the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical imaging lens satisfies:

[0017] 0.40 < EP34 / CT4 ≤ 1.65;

[0018] Wherein, 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 CT4 is the center thickness of the fourth lens.

[0019] In some embodiments of this application, the optical imaging lens satisfies:

[0020] -0.65 < d3s / (R5+R6) < 0.20;

[0021] Wherein, d3s is the inner diameter of the plane perpendicular to the optical axis of the object side of the third spacer element, R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0022] In some embodiments of this application, the optical imaging lens satisfies:

[0023] 0.90≤EP23 / (T23+CT3)<1.35;

[0024] Wherein, 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, T23 is the air gap between the second lens and the third lens on the optical axis, and CT3 is the center thickness of the third lens.

[0025] In some embodiments of this application, the optical imaging lens satisfies:

[0026] 8.30<d2m / (DT32-DT31)<17.60;

[0027] Wherein, d2m is the inner diameter of the plane perpendicular to the optical axis of the image side of the second spacer element, DT31 is the maximum effective radius of the object side of the third lens, and DT32 is the maximum effective radius of the image side of the third lens.

[0028] In some embodiments of this application, the optical imaging lens satisfies:

[0029] -12.55<f23 / (CT2+CT3)<-4.50;

[0030] Where f23 is the combined focal length of the second lens and the third lens, CT2 is the center thickness of the second lens, and CT3 is the center thickness of the third lens.

[0031] In some embodiments of this application, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging lens satisfies:

[0032] -0.30 < d1s / R3 < 0.20;

[0033] Wherein, d1s is the inner diameter of the plane perpendicular to the optical axis of the object side of the first spacer element, and R3 is the radius of curvature of the object side of the second lens.

[0034] In some embodiments of this application, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging lens satisfies:

[0035] 0.85<(EP01+EP12) / (CT1+CT2)<1.70;

[0036] Wherein, EP01 is the distance between the object side of the lens barrel and the object side of the first spacer element along the optical axis, EP12 is the distance between the image side of the first spacer element and the object side of the second spacer element along the optical axis, CT1 is the center thickness of the first lens, and CT2 is the center thickness of the second lens.

[0037] In some embodiments of this application, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging lens satisfies:

[0038] 5.00≤EP01 / SAG11<16.50;

[0039] Wherein, EP01 is the distance between the object side surface of the lens barrel and the object side surface of the first spacer element along the optical axis, and SAG11 is the displacement along the optical axis from the intersection of the object side surface of the first lens and the optical axis to the non-effective diameter region of the object side surface of the first lens.

[0040] In some embodiments of this application, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging lens satisfies:

[0041] 6.60≤f1 / EP01<20.25;

[0042] Wherein, f1 is the effective focal length of the first lens, and EP01 is the distance between the object side surface of the lens barrel and the object side surface of the first spacer element along the optical axis.

[0043] In some embodiments of this application, the optical imaging lens satisfies:

[0044] 4.15 < D0s / DT11 < 5.35;

[0045] Wherein, D0s is the outer diameter of the object-side surface of the lens barrel perpendicular to the optical axis, and DT11 is the maximum effective radius of the object-side surface of the first lens.

[0046] In some embodiments of this application, the optical imaging lens satisfies:

[0047] 2.20 < d0m / d0s < 3.40;

[0048] Wherein, d0m is the inner diameter of the image-side plane of the lens barrel perpendicular to the optical axis, and d0s is the inner diameter of the object-side plane of the lens barrel perpendicular to the optical axis.

[0049] In summary, this application constrains the ratio of the air gap between the second and third lenses on the optical axis to the combined focal length of the second and third lenses to satisfy the relationship -0.05≤T23 / f23<0.00. This requires a certain amount of optical power and air gap between the second and third lenses. However, this will result in a larger air gap between the second and third lenses on the optical axis. Light will more easily reach the edge of the lenses when passing through these two lenses, leading to stray light and reducing the imaging quality of the optical lens, especially in high-brightness or strong light source environments.

[0050] By controlling the ratio of the inner diameter of the object-side surface of the second spacer perpendicular to the optical axis to the inner diameter of the object-side surface of the third spacer perpendicular to the optical axis, satisfying the relationship 1.05 < d3s / d2s < 1.30, and the ratio of the maximum thickness of the second spacer along the optical axis to the sum of the distances between the image-side surface of the second spacer and the object-side surface of the third spacer along the optical axis to the inner diameter of the object-side surface of the second spacer perpendicular to the optical axis, satisfying the relationship 0.20 < (CP2 + EP23) / d2s < 0.30, the inner diameter distribution between spacers and the distance between spacers can be optimized. This optimizes the propagation path of light between lenses, helps reduce multiple reflections and refractions of light inside the lens and on the spacers, thereby reducing stray light generation and ultimately achieving a stable and reliable optical path inside the lens, improving the clarity and accuracy of optical lens imaging. Attached Figure Description

[0051] Figure 1A This is a schematic diagram of the structural parameters of an optical imaging lens according to one embodiment of this application;

[0052] Figure 1B This is a schematic diagram of the optical parameters of an optical imaging lens according to one embodiment of this application;

[0053] Figure 2 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application;

[0054] Figure 3 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application;

[0055] Figure 4 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application;

[0056] Figure 5AA schematic diagram of the on-axis chromatic aberration curves of the optical imaging lenses according to the above-described embodiments one, two, and three of this application is shown.

[0057] Figure 5B A schematic diagram of the astigmatism curves of the optical imaging lenses according to the above-described Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown.

[0058] Figure 5C The diagram shows the distortion curves of the optical imaging lenses according to the above-described embodiments one, two, and three of this application.

[0059] Figure 5D A schematic diagram of the magnification chromatic aberration curves of the optical imaging lenses according to the above-described embodiments one, two, and three of this application is shown.

[0060] Figure 6 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application;

[0061] Figure 7 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of this application;

[0062] Figure 8 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment Six of this application;

[0063] Figure 9A A schematic diagram of the on-axis chromatic aberration curves of the optical imaging lenses according to Embodiments 4, 5 and 6 of this application is shown.

[0064] Figure 9B A schematic diagram of the astigmatism curves of the optical imaging lenses according to Embodiments 4, 5 and 6 of this application is shown.

[0065] Figure 9C A schematic diagram of the distortion curves of the optical imaging lenses according to Embodiments 4, 5 and 6 of this application is shown.

[0066] Figure 9D A schematic diagram of the magnification chromatic aberration curves of the optical imaging lenses according to Embodiments 4, 5 and 6 of this application is shown.

[0067] Figure 10 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment Seven of this application;

[0068] Figure 11 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 8 of this application;

[0069] Figure 12 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment Nine of this application;

[0070] Figure 13A A schematic diagram of the on-axis chromatic aberration curve of the optical imaging lens according to Embodiments 7, 8 and 9 of this application is shown.

[0071] Figure 13B A schematic diagram of the astigmatism curves of the optical imaging lenses according to Embodiments 7, 8 and 9 of this application is shown.

[0072] Figure 13C A schematic diagram of the distortion curves of the optical imaging lenses according to Embodiments 7, 8 and 9 of this application is shown.

[0073] Figure 13D A schematic diagram of the magnification chromatic aberration curves of the optical imaging lenses according to Embodiments 7, 8, and 9 of this application is shown.

[0074] Figure 14A The stray light path diagram of the optical imaging lens is shown when T23 / f23=-0.05, d3s / d2s=0.55 and (CP2+EP23) / d2s=0.15.

[0075] Figure 14B The image shows the spot pattern of the optical imaging lens when T23 / f23=-0.05, d3s / d2s=0.55, and (CP2+EP23) / d2s=0.15.

[0076] Figure 15 The spot patterns of the optical imaging lens are shown when T23 / f23=-0.05, d3s / d2s=1.27, and (CP2+EP23) / d2s=0.28 respectively.

[0077] Figure 16A The stray light path diagram of the optical imaging lens is shown when T23 / f23=-0.05, d3s / d2s=1.47 and (CP2+EP23) / d2s=0.45.

[0078] Figure 16B The image shows the light pattern of the optical imaging lens when T23 / f23=-0.05, d3s / d2s=1.47, and (CP2+EP23) / d2s=0.45. Detailed Implementation

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In this paper, 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 shape in the paraxial region can be determined according to methods commonly used in the art, such as using the sign of the R value (R refers to the radius of curvature of the paraxial region) to determine concavity or convexity. In this paper, 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. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0083] In this article, the effective diameter region of a lens refers to the part of the lens used for imaging or light transmission, while the non-effective diameter region of a lens refers to the part of the lens that does not participate in imaging or light transmission. This non-effective diameter region is mainly used to cooperate with the lens spacer element and lens barrel to fix the position of the lens in the lens.

[0084] 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.

[0085] 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 a 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.

[0086] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0087] According to one aspect of this application, such as Figure 1A and Figure 1B As shown, this application provides an optical imaging lens, including a lens barrel and a lens group and a spacer element group housed 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; wherein, the third lens has negative optical power, and both the object side and the image side of the third lens are concave; the spacer element group includes a second spacer element placed between the second lens and the third lens and in contact with the image side of the second lens, and a third spacer element placed between the third lens and the fourth lens and in contact with the image side of the third lens; the optical imaging lens satisfies:

[0088] -0.05≤T23 / f23<0.00;

[0089] 1.05 < d3s / d2s < 1.30; and

[0090] 0.20 < (CP2 + EP23) / d2s < 0.30;

[0091] Wherein, T23 is the air gap between the second lens and the third lens on the optical axis, f23 is the combined focal length of the second lens and the third lens, d2s is the inner diameter of the object side of the second spacer element perpendicular to the optical axis, d3s is the inner diameter of the object side of the third spacer element perpendicular to the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis, and 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.

[0092] It is worth noting that this application requires the optical power and air gap between the second and third lenses to be satisfied by constraining the ratio of the air gap between the second and third lenses on the optical axis to the combined focal length of the second and third lenses to meet the relationship -0.05≤T23 / f23<0.00. This will result in a larger air gap between the second and third lenses on the optical axis. When light passes through these two lenses, it will be easier to reach the edge of the lens, resulting in stray light and reducing the imaging quality of the optical lens, especially in high brightness or strong light source environments.

[0093] By controlling the ratio of the inner diameter of the object-side surface of the second spacer perpendicular to the optical axis to the inner diameter of the object-side surface of the third spacer perpendicular to the optical axis, satisfying the relationship 1.05 < d3s / d2s < 1.30, and the ratio of the maximum thickness of the second spacer along the optical axis to the sum of the distances between the image-side surface of the second spacer and the object-side surface of the third spacer along the optical axis to the inner diameter of the object-side surface of the second spacer perpendicular to the optical axis, satisfying the relationship 0.20 < (CP2 + EP23) / d2s < 0.30, the inner diameter distribution between spacers and the distance between spacers can be optimized. This optimizes the propagation path of light between lenses, helps reduce multiple reflections and refractions of light inside the lens and on the spacers, thereby reducing stray light generation and ultimately achieving a stable and reliable optical path inside the lens, improving the clarity and accuracy of optical lens imaging.

[0094] For example, Figure 14A and Figure 14B The stray light path diagram and spot diagram of the optical imaging lens are shown respectively when T23 / f23=-0.05, d3s / d2s=0.55, and (CP2+EP23) / d2s=0.15. Figure 15 The image shows the spot pattern of the optical imaging lens when T23 / f23=-0.05, d3s / d2s=1.27, and (CP2+EP23) / d2s=0.28. Figure 16A and Figure 16B The stray light path diagram and spot diagram of the optical imaging lens are shown respectively when T23 / f23=-0.05, d3s / d2s=1.47, and (CP2+EP23) / d2s=0.45. As can be seen from the figures, as... Figure 14A and Figure 14B As shown, when d3s / d2s is less than or equal to 1.05, and (CP2+EP23) / d2s is less than or equal to 0.20, the width of the annular structure of the second spacer element is too short, and the spacing between the second and third lenses is too short. This results in a large amount of light entering the third lens from the edge of the second spacer element, causing numerous stray light spots to appear in the light pattern. Therefore, the risk of stray light generation is high, which has a significant impact on image quality. Figure 15 As shown, when d3s / d2s is within the range of greater than 1.05 and less than 1.30, and (CP2+EP23) / d2s is within the range of greater than 0.2 and less than 0.3, there are only a few spots in the spot pattern, thus the risk of stray light is low and the impact on image quality is low. Figure 16A and Figure 16B As shown, when d3s / d2s is greater than or equal to 1.30 and (CP2+EP23) / d2s is greater than or equal to 0.30, the third spacer element shifts towards the image side and the spacing between the second and third lenses is too long. This results in more light being reflected and refracted by the third lens and the third spacer element, leading to a large number of stray light spots in the light spot pattern. Therefore, the risk of stray light is high and the impact on image quality is significant.

[0095] Preferably, the optical imaging lens satisfies: -0.05≤T23 / f23≤-0.02; 1.08≤d3s / d2s≤1.29; and 0.23≤(CP2+EP23) / d2s≤0.29.

[0096] According to some embodiments of this application, the spacer group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical imaging lens satisfies: 1.95 < d4s / DT42 < 2.15; where d4s is the inner diameter of the object-side surface of the fourth spacer element perpendicular to the optical axis, and DT42 is the maximum effective radius of the image-side surface of the fourth lens.

[0097] In this way, by adjusting the ratio of d4s to DT42, the aperture of the fourth lens can be controlled, which can effectively improve the stray light inside the fourth lens and the light leakage on the image side of the fourth lens. At the same time, it can also ensure that the optical imaging lens meets specific aberration requirements during the design.

[0098] Preferably, the optical imaging lens satisfies: 1.96≤d4s / DT42≤2.12.

[0099] According to some embodiments of this application, the optical imaging lens satisfies: 0.55 < |SAG42| / |SAG41| < 2.75; where SAG42 is the displacement along the optical axis from the intersection of the image-side surface of the fourth lens and the optical axis to the non-effective diameter region of the image-side surface of the fourth lens, and SAG41 is the displacement along the optical axis from the intersection of the object-side surface of the fourth lens and the optical axis to the non-effective diameter region of the object-side surface of the fourth lens.

[0100] In this way, by controlling the ratio of |SAG42| to |SAG41|, the external dimensions of the fourth lens can be optimized, which can enhance the tolerance of the fourth lens to manufacturing and assembly errors, thereby improving the stability of the entire optical imaging lens.

[0101] Preferably, the optical imaging lens satisfies: 0.56≤|SAG42| / |SAG41|≤2.74.

[0102] According to some embodiments of this application, the spacer group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical imaging lens satisfies: 0.40 < EP34 / CT4 ≤ 1.65; where EP34 is the distance between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis, and CT4 is the center thickness of the fourth lens.

[0103] By controlling the ratio of EP34 to CT4, the overall layout of the optical imaging lens can be optimized, ensuring a more rational relative positional relationship between the lenses. This avoids unnecessary interference or loss of light within the lens and also ensures structural stability and uniform stress during the assembly of the third and fourth lenses. Adjusting the ratio of EP34 to CT4 can, to some extent, control aberrations caused by lens spacing and thickness, such as field curvature and distortion, thereby further improving image quality.

[0104] Preferably, the optical imaging lens satisfies: 0.43≤EP34 / CT4≤1.65.

[0105] According to some embodiments of this application, the optical imaging lens satisfies: -0.65 < d3s / (R5+R6) < 0.20; where d3s is the inner diameter of the object-side surface of the third spacer element perpendicular to the optical axis, R5 is the radius of curvature of the object-side surface of the third lens, and R6 is the radius of curvature of the image-side surface of the third lens.

[0106] In this way, by controlling the ratio of d3s to (R5+R6), the refraction angle of light between the third lens and the third spacer element can be controlled, thereby ensuring that light can pass through the third lens in the expected manner. This optimizes the imaging performance of the optical imaging lens, reduces aberrations and distortion, and improves the forming quality of the optical imaging lens.

[0107] Preferably, the optical imaging lens satisfies: -0.62≤d3s / (R5+R6)≤0.19.

[0108] According to some embodiments of this application, the optical imaging lens satisfies: 0.90≤EP23 / (T23+CT3)<1.35; where 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, T23 is the air gap between the second lens and the third lens on the optical axis, and CT3 is the center thickness of the third lens.

[0109] In this way, by controlling the ratio of EP23 to (T23+CT3), the specific spacing between spacers, the air gap between lenses, and the lens thickness can be maintained, thus satisfying the specific lens layout and ensuring a compact and miniaturized lens design.

[0110] Preferably, the optical imaging lens satisfies: 0.90≤EP23 / (T23+CT3)≤1.33.

[0111] According to some embodiments of this application, the optical imaging lens satisfies: 8.30 < d2m / (DT32-DT31) < 17.60; where d2m is the inner diameter of the plane perpendicular to the optical axis of the image side of the second spacer element, DT31 is the maximum effective radius of the object side of the third lens, and DT32 is the maximum effective radius of the image side of the third lens.

[0112] In this way, by controlling the ratio of d2m to (DT32-DT31), the refraction angle of light entering and exiting the third lens can be controlled, which helps to ensure that the light passes through the lens in the expected way. At the same time, it also helps to ensure the performance and imaging quality of the lens, affects the state of light exiting from the second and third lenses, controls the entry of internal stray light into the lens, and avoids affecting the imaging quality of the lens.

[0113] Preferably, the optical imaging lens satisfies: 8.31≤d2m / (DT32-DT31)≤17.49.

[0114] According to some embodiments of this application, the optical imaging lens satisfies: -12.55 < f23 / (CT2+CT3) < -4.50; where f23 is the combined focal length of the second lens and the third lens, CT2 is the center thickness of the second lens, and CT3 is the center thickness of the third lens.

[0115] In this way, by controlling the ratio of f23 to (CT2+CT3), the optical performance of the combined second and third lenses can be optimized. By controlling the ratio of f23 to (CT2+CT3) within the range of greater than -12.55 and less than -4.50, it is possible to ensure that the combined second and third lenses have appropriate focal length and thickness, thereby reducing aberrations and improving image quality. It also helps to reduce the assembly step difference between the second and third lenses, ensuring the assembly stability of the second and third lenses.

[0116] Preferably, the optical imaging lens satisfies: -12.52≤f23 / (CT2+CT3)≤-4.54.

[0117] According to some embodiments of this application, the spacer group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the optical imaging lens satisfies: -0.30 < d1s / R3 < 0.20; where d1s is the inner diameter of the object side surface of the first spacer element in a plane perpendicular to the optical axis, and R3 is the radius of curvature of the object side surface of the second lens.

[0118] By controlling the ratio of d1s to R3, the relative position and size between the first spacer element and the second lens can be precisely controlled, thereby reducing aberrations, improving image quality, and enhancing contrast and sharpness, thus optimizing the overall optical performance of the lens. By controlling the ratio of d1s to R3 within a range greater than -0.30 and less than 0.20, the propagation of light can be more effectively controlled, allowing light to pass through the lens in the intended manner, resulting in better imaging.

[0119] Preferably, the optical imaging lens satisfies: -0.29≤d1s / R3≤0.16.

[0120] According to some embodiments of this application, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image side of the first lens; the optical imaging lens satisfies: 0.85 < (EP01 + EP12) / (CT1 + CT2) < 1.70; wherein, EP01 is the distance between the object side of the lens barrel and the object side of the first spacer element along the optical axis, EP12 is the distance between the image side of the first spacer element and the object side of the second spacer element along the optical axis, CT1 is the center thickness of the first lens, and CT2 is the center thickness of the second lens.

[0121] In this way, by controlling the ratio of (EP01+EP12) and (CT1+CT2), the shapes of the first and second lenses can be effectively controlled. This ensures the assembly stability of the first and second lenses, facilitates the compactness of the lens structure, and also helps to correct off-axis aberrations and improve the overall imaging quality of the lens.

[0122] Preferably, the optical imaging lens satisfies: 0.87≤(EP01+EP12) / (CT1+CT2)≤1.68.

[0123] According to some embodiments of this application, the spacer group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging lens satisfies: 5.00≤EP01 / SAG11<16.50; wherein, EP01 is the distance between the object-side surface of the lens barrel and the object-side surface of the first spacer element along the optical axis, and SAG11 is the displacement along the optical axis from the intersection of the object-side surface of the first lens and the optical axis to the non-effective diameter region of the object-side surface of the first lens.

[0124] In this way, by controlling the ratio of EP01 to SAG11, it is possible to optimize the internal structure layout of the lens while satisfying the large field of view (FOV), ensuring that the first lens does not protrude towards the object side, thereby ensuring reasonable spacing between various components of the lens and assembly stability, and also helping to reduce stray light and reflected stray light inside the first lens.

[0125] Preferably, the optical imaging lens satisfies: 5.00≤EP01 / SAG11≤16.46.

[0126] According to some embodiments of this application, the spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the optical imaging lens satisfies: 6.60≤f1 / EP01<20.25; where f1 is the effective focal length of the first lens, and EP01 is the distance between the object side surface of the lens barrel and the object side surface of the first spacer element along the optical axis.

[0127] In this way, by controlling the ratio of f1 to EP01, the optical performance of the lens can be optimized, aberrations can be reduced, and the overall structure of the lens can be designed more compactly to make the lens smaller and lighter, thereby reducing manufacturing costs while ensuring lens performance.

[0128] Preferably, the optical imaging lens satisfies: 6.60≤f1 / EP01≤20.23.

[0129] According to some embodiments of this application, the optical imaging lens satisfies: 4.15 < D0s / DT11 < 5.35; where D0s is the outer diameter of the object-side surface of the lens barrel perpendicular to the optical axis, and DT11 is the maximum effective radius of the object-side surface of the first lens.

[0130] In this way, by controlling the ratio of D0s to DT11, the outer diameter of the first lens can be effectively controlled, which helps to improve the limiting process during the production of the first lens, thereby improving the stability and reliability of the lens assembly. It also helps to reduce interference and stray light between the lens barrel and the first lens, thereby improving optical performance.

[0131] Preferably, the optical imaging lens satisfies: 4.18≤D0s / DT11≤5.33.

[0132] According to some embodiments of this application, the optical imaging lens satisfies: 2.20 < d0m / d0s < 3.40; where d0m is the inner diameter of the image-side plane of the lens barrel perpendicular to the optical axis, and d0s is the inner diameter of the object-side plane of the lens barrel perpendicular to the optical axis.

[0133] In this way, by controlling the ratio of d0m to d0s, it can be ensured that the optical imaging lens meets the requirements of a large field of view while conforming to the rationality of the lens barrel structure, ensuring the assembly step difference and assembly stability, and at the same time facilitating the assembly and adjustment of the lens barrel and other optical components.

[0134] Preferably, the optical imaging lens satisfies: 2.24≤d0m / d0s≤3.37.

[0135] It should be noted that those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of spacers constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit this. For example, as needed, the optical imaging lens may also include other numbers of spacers than those described in the above embodiments.

[0136] The following describes some specific, non-limiting embodiments of the above-described embodiments of this application in more detail with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the optical imaging lens (not shown in the figures), STO represents the surface of the aperture stop (not shown in the figures), S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the third lens E3, S6 represents the image-side plane of the third lens E3, S7 represents the object-side plane of the fourth lens E4, S8 represents the image-side plane of the fourth lens E4, and S9 represents the fifth lens E1. The object-side plane of lens E5 is defined as follows: S10 represents the image-side plane of the fifth lens E5; S11 represents the object-side plane of the sixth lens E6; S12 represents the image-side plane of the sixth lens E6; S13 represents the object-side plane of the seventh lens E7; S14 represents the image-side plane of the seventh lens E7; S15 represents the object-side plane of the eighth lens E8; S16 represents the image-side plane of the eighth lens E8; S17 can represent the object-side plane of a filter (not shown in the figure); S18 can represent the image-side plane of a filter (not shown in the figure); and S19 represents the image plane of the optical imaging lens (not shown in the figure). Furthermore, Aj represents the j-th order aspherical coefficient, where j = 4, 6, 8, 10, 12, 14, 16, 18, 20.

[0137] Example 1

[0138] like Figure 2 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0 and a lens group and a spacer element group housed within the lens barrel P0. The lens assembly includes, arranged sequentially along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The spacer element group includes a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, and a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3.

[0139] In this embodiment, the spacer group further includes a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image-side surface of the first lens E1; a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fourth auxiliary spacer P4b placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth spacer P4; and a spacer P4b placed between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5. The fifth spacer element P5 is in contact with the fifth lens E5 and the sixth lens E6, the fifth auxiliary spacer element P5b is placed between the fifth lens E5 and the sixth lens E6 and is in contact with the image side of the fifth spacer element P5, the sixth spacer element P6 is placed between the sixth lens E6 and the seventh lens E7 and is in contact with the image side of the sixth lens E6, the seventh spacer element P7 is placed between the seventh lens E7 and the eighth lens E8 and is in contact with the image side of the seventh lens E7, and the eighth spacer element P8 is placed on the image side of the eighth lens E8 and is in contact with the image side of the eighth lens E8.

[0140] In this embodiment, the first lens E1 has positive optical power, and both the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex surfaces; the second lens E2 has negative optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are convex and concave surfaces, respectively; the third lens E3 has negative optical power, and both the object-side surface S5 and the image-side surface S6 of the third lens E3 are concave surfaces; the fourth lens E4 has positive optical power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are concave and convex surfaces, respectively. The fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are concave and convex, respectively; the sixth lens E6 has positive optical power, and its object-side surface S11 and image-side surface S12 are both convex; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are both concave; the eighth lens E8 has negative optical power, and its object-side surface S15 and image-side surface S16 are both convex and concave, respectively.

[0141] In addition, Table 1 shows the basic optical parameters of the optical imaging lens of Embodiment 1, wherein the units of radius of curvature, thickness / distance and effective radius are all millimeters (mm).

[0142] Table 1: Basic Optical Parameters of the Optical Imaging Lens in Example 1

[0143]

[0144] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0145] ;

[0146] 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 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1 to S16 in Example 1.

[0147] Table 2: Aspherical coefficients of the optical imaging lens in Example 1

[0148]

[0149] Example 2

[0150] like Figure 3 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0 and a lens group and a spacer element group housed within the lens barrel P0. The lens assembly includes, arranged sequentially along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The spacer element group includes a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, and a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3.

[0151] In this embodiment, the spacer group further includes a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image-side surface of the first lens E1; a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fourth auxiliary spacer P4b placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth spacer P4; and a spacer P4b placed between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5. The fifth spacer element P5 is in contact with the fifth lens E5 and the sixth lens E6, the fifth auxiliary spacer element P5b is placed between the fifth lens E5 and the sixth lens E6 and is in contact with the image side of the fifth spacer element P5, the sixth spacer element P6 is placed between the sixth lens E6 and the seventh lens E7 and is in contact with the image side of the sixth lens E6, the seventh spacer element P7 is placed between the seventh lens E7 and the eighth lens E8 and is in contact with the image side of the seventh lens E7, and the eighth spacer element P8 is placed on the image side of the eighth lens E8 and is in contact with the image side of the eighth lens E8.

[0152] It is worth noting that, compared with Embodiment 1 above, the optical imaging lens of Embodiment 2 has the same white object structure, that is, the basic optical parameter table of the optical imaging lens of Embodiment 2 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. However, the optical imaging lens of Embodiment 2 has a different black object structure than the optical imaging lens of Embodiment 1 above, that is, the difference between Embodiment 2 and Embodiment 1 above lies in the different dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical imaging lens.

[0153] Specifically, the values ​​of various related structural parameters in this embodiment and the above embodiment one are shown in Table 8 below. Multiple black object parameters specifically include: the inner diameter d1s of the object-side surface of the first spacer element perpendicular to the optical axis; the inner diameter d2s of the object-side surface of the second spacer element perpendicular to the optical axis; the inner diameter d2m of the image-side surface of the second spacer element perpendicular to the optical axis; the inner diameter d3s of the object-side surface of the third spacer element perpendicular to the optical axis; the inner diameter d4s of the object-side surface of the fourth spacer element perpendicular to the optical axis; the inner diameter d0s of the object-side surface of the lens barrel perpendicular to the optical axis; the inner diameter d0m of the image-side surface of the lens barrel perpendicular to the optical axis; the outer diameter D0s of the object-side surface of the lens barrel perpendicular to the optical axis; and the distance EP01 between the object-side surface of the lens barrel and the object-side surface of the first spacer element along the optical axis. The following parameters are defined as follows: EP12: the distance between the image-side surface of the first spacer element and the object-side surface of the second spacer element along the optical axis; CP2: the maximum thickness of the second spacer element along the optical axis; EP23: the distance between the image-side surface of the second spacer element and the object-side surface of the third spacer element along the optical axis; EP34: the distance between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis; SAG11: the displacement along the optical axis from the intersection of the object-side surface of the first lens and the optical axis to the non-effective diameter region of the object-side surface of the first lens; SAG41: the displacement along the optical axis from the intersection of the object-side surface of the fourth lens and the optical axis to the non-effective diameter region of the object-side surface of the fourth lens; SAG42: the displacement along the optical axis from the intersection of the image-side surface of the fourth lens and the optical axis to the non-effective diameter region of the image-side surface of the fourth lens. It is understood that the units for the values ​​of each parameter shown in Table 8 are millimeters (mm), and the schematic diagrams of each parameter in the optical imaging lens structure diagram are as follows. Figure 1A , Figure 1B As shown.

[0154] Example 3

[0155] like Figure 4 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0 and a lens group and a spacer element group housed within the lens barrel P0. The lens assembly includes, arranged sequentially along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The spacer element group includes a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, and a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3.

[0156] In this embodiment, the spacer group further includes a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image-side surface of the first lens E1; a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fourth auxiliary spacer P4b placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth spacer P4; and a spacer P4b placed between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5. The fifth spacer element P5 is in contact with the fifth lens E5 and the sixth lens E6, the fifth auxiliary spacer element P5b is placed between the fifth lens E5 and the sixth lens E6 and is in contact with the image side of the fifth spacer element P5, the sixth spacer element P6 is placed between the sixth lens E6 and the seventh lens E7 and is in contact with the image side of the sixth lens E6, the seventh spacer element P7 is placed between the seventh lens E7 and the eighth lens E8 and is in contact with the image side of the seventh lens E7, and the eighth spacer element P8 is placed on the image side of the eighth lens E8 and is in contact with the image side of the eighth lens E8.

[0157] It is worth noting that, compared with Embodiment 1 above, the optical imaging lens of Embodiment 3 has the same white object structure, that is, the basic optical parameter table of the optical imaging lens of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. However, the optical imaging lens of Embodiment 3 has a different black object structure than the optical imaging lens of Embodiment 1 above. That is, the difference between Embodiment 3 and Embodiment 1 is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical imaging lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 3 are shown in Table 8 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0158] After testing, the on-axis chromatic aberration curves of the optical imaging lenses in Examples 1, 2, and 3 are as follows: Figure 5A As shown, this represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging lens; the astigmatism curves of the optical imaging lenses in Embodiments 1, 2, and 3 are shown below. Figure 5B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging lenses in Embodiments 1, 2, and 3 are as follows. Figure 5C As shown, it illustrates the distortion of the optical imaging lens at different field of view angles and its variation patterns; the magnification chromatic aberration curves of the optical imaging lenses in Examples 1, 2, and 3 are shown below. Figure 5D As shown, this illustrates the difference in magnification for different wavelengths of light during the imaging process. According to... Figure 5A , Figure 5B , Figure 5Cand Figure 5D It can be seen that the optical imaging lenses in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0159] Example 4

[0160] like Figure 6 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0 and a lens group and a spacer element group housed within the lens barrel P0. The lens assembly includes, arranged sequentially along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The spacer element group includes a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, and a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3.

[0161] In this embodiment, the spacer group further includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image-side surface of the first lens E1; a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fourth auxiliary spacer element P4b placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth spacer element P4; a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5; and a fourth auxiliary spacer element P4b placed between the fifth lens E5 and the second lens E2. The fifth auxiliary spacer element P5b is located between the six lenses E6 and in contact with the image side of the fifth spacer element P5; the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6; the seventh spacer element P7 is located between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh lens E7; the seventh auxiliary spacer element P7b is located between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh spacer element P7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side of the eighth lens E8.

[0162] In this embodiment, the first lens E1 has positive optical power, and both the object-side surface S1 and the image-side surface S2 of the first lens E1 are convex surfaces; the second lens E2 has positive optical power, and the object-side surface S3 and the image-side surface S4 of the second lens E2 are convex and concave surfaces, respectively; the third lens E3 has negative optical power, and both the object-side surface S5 and the image-side surface S6 of the third lens E3 are concave surfaces; the fourth lens E4 has positive optical power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens E4 are concave and convex surfaces, respectively. The fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are concave and convex, respectively; the sixth lens E6 has positive optical power, and its object-side surface S11 and image-side surface S12 are both convex; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are both concave; the eighth lens E8 has negative optical power, and its object-side surface S15 and image-side surface S16 are both convex and concave, respectively.

[0163] In addition, Table 3 shows the basic optical parameters of the optical imaging lens of Embodiment 4, wherein the units of radius of curvature, thickness / distance and effective radius are all millimeters (mm).

[0164] Table 3: Basic optical parameters of the optical imaging lens in Example 4

[0165]

[0166] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1 to S16 in Embodiment 4.

[0167] Table 4: Aspherical coefficients of the optical imaging lens in Example 4

[0168]

[0169] Example 5

[0170] like Figure 7As shown, in this embodiment, the optical imaging lens includes a lens barrel P0 and a lens group and a spacer element group housed within the lens barrel P0. The lens assembly includes, arranged sequentially along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The spacer element group includes a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, and a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3.

[0171] In this embodiment, the spacer group further includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image-side surface of the first lens E1; a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fourth auxiliary spacer element P4b placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth spacer element P4; a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5; and a fourth auxiliary spacer element P4b placed between the fifth lens E5 and the second lens E2. The fifth auxiliary spacer element P5b is located between the six lenses E6 and in contact with the image side of the fifth spacer element P5; the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6; the seventh spacer element P7 is located between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh lens E7; the seventh auxiliary spacer element P7b is located between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh spacer element P7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side of the eighth lens E8.

[0172] It is worth noting that, compared with Embodiment 4 above, the optical imaging lens of Embodiment 5 has the same white object structure, that is, the basic optical parameter table of the optical imaging lens of Embodiment 5 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. However, the optical imaging lens of Embodiment 5 has a different black object structure than the optical imaging lens of Embodiment 4 above. That is, the difference between Embodiment 5 and Embodiment 4 is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical imaging lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 5 are shown in Table 8 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0173] Example 6

[0174] like Figure 8 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0 and a lens group and a spacer element group housed within the lens barrel P0. The lens assembly includes, arranged sequentially along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The spacer element group includes a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, and a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3.

[0175] In this embodiment, the spacer group further includes a first spacer element P1 placed between the first lens E1 and the second lens E2 and in contact with the image-side surface of the first lens E1; a fourth spacer element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth lens E4; a fourth auxiliary spacer element P4b placed between the fourth lens E4 and the fifth lens E5 and in contact with the image-side surface of the fourth spacer element P4; a fifth spacer element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image-side surface of the fifth lens E5; and a fourth auxiliary spacer element P4b placed between the fifth lens E5 and the second lens E2. The fifth auxiliary spacer element P5b is located between the six lenses E6 and in contact with the image side of the fifth spacer element P5; the sixth spacer element P6 is located between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6; the seventh spacer element P7 is located between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh lens E7; the seventh auxiliary spacer element P7b is located between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh spacer element P7; and the eighth spacer element P8 is located on the image side of the eighth lens E8 and in contact with the image side of the eighth lens E8.

[0176] It is worth noting that, compared with Embodiment 4 above, the optical imaging lens of Embodiment 6 has the same white object structure, that is, the basic optical parameter table of the optical imaging lens of Embodiment 6 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. However, the optical imaging lens of Embodiment 6 has a different black object structure than the optical imaging lens of Embodiment 4 above. That is, the difference between Embodiment 6 and Embodiment 4 above is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical imaging lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 6 are shown in Table 8 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0177] After testing, the on-axis chromatic aberration curves of the optical imaging lenses in Examples 4, 5, and 6 are as follows: Figure 9A As shown, this represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging lens; the astigmatism curves of the optical imaging lenses in Examples 4, 5, and 6 are shown below. Figure 9B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging lenses in Examples 4, 5, and 6 are as follows. Figure 9C As shown, it illustrates the distortion of the optical imaging lens at different field of view angles and its variation patterns; the magnification chromatic aberration curves of the optical imaging lenses in Examples 4, 5, and 6 are shown below. Figure 9D As shown, this illustrates the difference in magnification for different wavelengths of light during the imaging process. According to... Figure 9A , Figure 9B , Figure 9C and Figure 9D It can be seen that the optical imaging lenses in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0178] Example 7

[0179] like Figure 10 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0 and a lens group and a spacer element group housed within the lens barrel P0. The lens assembly includes, arranged sequentially along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The spacer element group includes a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, and a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3.

[0180] In this embodiment, the spacing element group further includes a first spacing element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a third auxiliary spacing element P3b placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third spacing element P3; a fourth spacing element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth spacing element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; a sixth spacing element P6 placed between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6; a seventh spacing element P7 placed between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh lens E7; and an eighth spacing element P8 placed on the image side of the eighth lens E8 and in contact with the image side of the eighth lens E8.

[0181] In this embodiment, the first lens E1 has positive optical power, and both its object-side surface S1 and image-side surface S2 are convex. The second lens E2 has negative optical power, and its object-side surface S3 and image-side surface S4 are concave and convex, respectively. The third lens E3 has negative optical power, and both its object-side surface S5 and image-side surface S6 are concave. The fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are convex and concave, respectively. The fifth lens E5 has positive optical power, and its object-side surface S9 and image-side surface S10 are concave and convex, respectively; the sixth lens E6 has positive optical power, and its object-side surface S11 and image-side surface S12 are both convex; the seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are both concave and convex, respectively; the eighth lens E8 has negative optical power, and its object-side surface S15 and image-side surface S16 are both concave.

[0182] In addition, Table 5 shows the basic optical parameters of the optical imaging lens of Embodiment 7, wherein the units of radius of curvature, thickness / distance and effective radius are all millimeters (mm).

[0183] Table 5: Basic Optical Parameters of the Optical Imaging Lens in Example 7

[0184]

[0185] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 6 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror S1 to S16 in Embodiment 7.

[0186] Table 6: Aspherical coefficients of the optical imaging lens in Example 7

[0187]

[0188] Example 8

[0189] like Figure 11 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0 and a lens group and a spacer element group housed within the lens barrel P0. The lens assembly includes, arranged sequentially along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The spacer element group includes a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, and a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3.

[0190] In this embodiment, the spacing element group further includes a first spacing element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a third auxiliary spacing element P3b placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third spacing element P3; a fourth spacing element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth spacing element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; a sixth spacing element P6 placed between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6; a seventh spacing element P7 placed between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh lens E7; and an eighth spacing element P8 placed on the image side of the eighth lens E8 and in contact with the image side of the eighth lens E8.

[0191] It is worth noting that, compared with Embodiment 7 above, the optical imaging lens of Embodiment 8 has the same white object structure, that is, the basic optical parameter table of the optical imaging lens of Embodiment 8 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the optical imaging lens of Embodiment 8 has a different black object structure than the optical imaging lens of Embodiment 7 above. That is, the difference between Embodiment 8 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical imaging lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 8 are shown in Table 8 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0192] Example 9

[0193] like Figure 12 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0 and a lens group and a spacer element group housed within the lens barrel P0. The lens assembly includes, arranged sequentially along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The spacer element group includes a second spacer element P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2, and a third spacer element P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3.

[0194] In this embodiment, the spacing element group further includes a first spacing element P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a third auxiliary spacing element P3b placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third spacing element P3; a fourth spacing element P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth spacing element P5 placed between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; a sixth spacing element P6 placed between the sixth lens E6 and the seventh lens E7 and in contact with the image side of the sixth lens E6; a seventh spacing element P7 placed between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh lens E7; and an eighth spacing element P8 placed on the image side of the eighth lens E8 and in contact with the image side of the eighth lens E8.

[0195] It is worth noting that, compared with Embodiment 7 above, the optical imaging lens of Embodiment 9 has the same white object structure, that is, the basic optical parameter table of the optical imaging lens of Embodiment 9 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the optical imaging lens of Embodiment 9 has a different black object structure than the optical imaging lens of Embodiment 7 above. That is, the difference between Embodiment 9 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and the spacer assembly in the optical imaging lens are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 9 are shown in Table 8 below. The specific descriptions of the multiple black object parameters are the same as those in Embodiment 2 above, and will not be repeated here.

[0196] After testing, the on-axis chromatic aberration curves of the optical imaging lenses in Examples 7, 8, and 9 are as follows: Figure 13A As shown, this represents the degree of deviation of the focal point after light of different wavelengths passes through the optical imaging lens; the astigmatism curves of the optical imaging lenses in Examples 7, 8, and 9 are shown below. Figure 13B As shown, it represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curves of the optical imaging lenses in Embodiments 7, 8, and 9 are as follows. Figure 13C As shown, it illustrates the distortion of the optical imaging lens at different field of view angles and its variation patterns; the magnification chromatic aberration curves of the optical imaging lenses in Examples 7, 8, and 9 are shown below. Figure 13D As shown, this illustrates the difference in magnification for different wavelengths of light during the imaging process. According to... Figure 13A , Figure 13B , Figure 13C and Figure 13D It can be seen that the optical imaging lenses in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0197] In summary, in Embodiments 1 to 9, the effective focal length f of the optical imaging lens, the effective focal lengths f1 to f8 of the first lens E1 to the eighth lens E8 in the optical imaging lens, and the combined focal length f23 of the second lens E2 and the third lens E3 in the optical imaging lens are shown in Table 7 below.

[0198] Table 7: System Optical Parameters of Optical Imaging Lens

[0199]

[0200] Furthermore, the black object structure parameters of the optical imaging lenses in Examples 1 to 9 are specifically shown in Table 8.

[0201] Table 8: Black matter structure parameters of optical imaging lenses

[0202]

[0203] In summary, the optical imaging lenses in Examples 1 to 9 satisfy the relationships shown in Table 9, as detailed in Table 9.

[0204] Table 9: Relationships Satisfied by Optical Imaging Lenses

[0205]

[0206] It is worth mentioning that, according to one aspect of this application, one embodiment of this application further provides a camera module, which may include the aforementioned optical imaging lens and a photosensitive element, the photosensitive element being disposed on the image side of the optical imaging lens for imaging. It is understood that the photosensitive element mentioned in this application may, but is not limited to, be implemented as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) device, and this application will not elaborate further on this.

[0207] Furthermore, according to another aspect of this application, one embodiment of this application provides an electronic device that may include a camera module and a processor as described above. The camera module is communicatively connected to the processor for acquiring image data and inputting the image data into the processor for processing. It is understood that the electronic device mentioned in this application may, but is not limited to, a device such as a mobile phone equipped with the camera module, and this application will not elaborate further on this.

[0208] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0209] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical imaging lens, characterized in that: The system includes a lens barrel and a lens assembly and a spacer assembly housed within the lens barrel. The lens assembly comprises, arranged sequentially along the optical axis from the object side to the image side, 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. The lens assembly contains eight lenses with optical power. The first lens has positive optical power, and both its object-side and image-side surfaces are convex. The third lens has negative optical power, and both its object-side and image-side surfaces are concave. The fourth lens has positive optical power. The fifth lens has positive optical power, and the first... The object-side and image-side surfaces of the fifth lens are concave and convex, respectively; the sixth lens has positive optical power, and both its object-side and image-side surfaces are convex; the seventh lens has negative optical power, and its object-side surface is concave; the eighth lens has negative optical power, and its image-side surface is concave; the spacer element group includes a second spacer element placed between the second lens and the third lens and in contact with the image-side surface of the second lens, and a third spacer element placed between the third lens and the fourth lens and in contact with the image-side surface of the third lens; the optical imaging lens satisfies: -0.05≤T23 / f23<0.00; 1.05 < d3s / d2s < 1.30; and 0.20 < (CP2 + EP23) / d2s < 0.30; Wherein, T23 is the air gap between the second lens and the third lens on the optical axis, f23 is the combined focal length of the second lens and the third lens, d2s is the inner diameter of the object side of the second spacer element perpendicular to the optical axis, d3s is the inner diameter of the object side of the third spacer element perpendicular to the optical axis, CP2 is the maximum thickness of the second spacer element along the optical axis, and 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.

2. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical imaging lens satisfies: 1.95 < d4s / DT42 < 2.15; Wherein, d4s is the inner diameter of the object-side surface of the fourth spacer element perpendicular to the optical axis, and DT42 is the maximum effective radius of the image-side surface of the fourth lens.

3. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 0.55<|SAG42| / |SAG41|<2.75; Wherein, SAG42 is the displacement along the optical axis from the intersection of the image-side surface of the fourth lens and the optical axis to the non-effective diameter region of the image-side surface of the fourth lens, and SAG41 is the displacement along the optical axis from the intersection of the object-side surface of the fourth lens and the optical axis to the non-effective diameter region of the object-side surface of the fourth lens.

4. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; the optical imaging lens satisfies: 0.40 < EP34 / CT4 ≤ 1.65; Wherein, 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 CT4 is the center thickness of the fourth lens.

5. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: -0.65 < d3s / (R5+R6) < 0.20; Wherein, d3s is the inner diameter of the plane perpendicular to the optical axis of the object side of the third spacer element, R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens.

6. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 0.90≤EP23 / (T23+CT3)<1.35; Wherein, 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, T23 is the air gap between the second lens and the third lens on the optical axis, and CT3 is the center thickness of the third lens.

7. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 8.30<d2m / (DT32-DT31)<17.60; Wherein, d2m is the inner diameter of the plane perpendicular to the optical axis of the image side of the second spacer element, DT31 is the maximum effective radius of the object side of the third lens, and DT32 is the maximum effective radius of the image side of the third lens.

8. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: -12.55<f23 / (CT2+CT3)<-4.50; Where f23 is the combined focal length of the second lens and the third lens, CT2 is the center thickness of the second lens, and CT3 is the center thickness of the third lens.

9. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging lens satisfies: -0.30 < d1s / R3 < 0.20; Wherein, d1s is the inner diameter of the plane perpendicular to the optical axis of the object side of the first spacer element, and R3 is the radius of curvature of the object side of the second lens.

10. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging lens satisfies: 0.85<(EP01+EP12) / (CT1+CT2)<1.70; Wherein, EP01 is the distance between the object side of the lens barrel and the object side of the first spacer element along the optical axis, EP12 is the distance between the image side of the first spacer element and the object side of the second spacer element along the optical axis, CT1 is the center thickness of the first lens, and CT2 is the center thickness of the second lens.

11. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging lens satisfies: 5.00≤EP01 / SAG11<16.50; Wherein, EP01 is the distance between the object side surface of the lens barrel and the object side surface of the first spacer element along the optical axis, and SAG11 is the displacement along the optical axis from the intersection of the object side surface of the first lens and the optical axis to the non-effective diameter region of the object side surface of the first lens.

12. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a first spacer element disposed between the first lens and the second lens and in contact with the image-side surface of the first lens; the optical imaging lens satisfies: 6.60≤f1 / EP01<20.25; Wherein, f1 is the effective focal length of the first lens, and EP01 is the distance between the object side surface of the lens barrel and the object side surface of the first spacer element along the optical axis.

13. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 4.15 < D0s / DT11 < 5.35; Wherein, D0s is the outer diameter of the object-side surface of the lens barrel perpendicular to the optical axis, and DT11 is the maximum effective radius of the object-side surface of the first lens.

14. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies: 2.20 < d0m / d0s < 3.40; Wherein, d0m is the inner diameter of the image-side plane of the lens barrel perpendicular to the optical axis, and d0s is the inner diameter of the object-side plane of the lens barrel perpendicular to the optical axis.

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