Optical imaging lens

Abstract

The application discloses an optical imaging lens, comprising a lens barrel, a lens set and at least seven spacer elements accommodated in the lens barrel. The lens set comprises first to eighth lenses arranged in sequence from an object side to an image side along an optical axis, wherein at least one of the first to fourth lenses is a meniscus lens, and the seventh and eighth lenses have positive and negative different focal lengths. The spacer elements comprise a jth spacer element arranged on the image side of the jth lens and partially in contact with the jth lens, and a j-1th spacer element arranged on the image side of the j-1th lens and partially in contact with the j-1th lens, the j-1th spacer element and the jth spacer element satisfy the following conditions: EP(j-1) / CPj+T(j-1) / CTj>0.5, wherein j is 5, 6 or 7, EP(j-1) is the interval distance of the j-1th spacer element and the jth spacer element along the optical axis, CPj is the maximum thickness of the jth spacer element, T(j-1) is the air interval of the j-1th lens and the jth lens on the optical axis, and CTj is the central thickness of the jth lens on the optical axis.

Description

[0001] Divisional application statement

[0002] This application is a divisional application of Chinese invention patent application filed on May 13, 2022, entitled "Optical Imaging Lens" and with application number 202210523670.6. Technical Field

[0003] This application relates to the field of optical components, and more specifically, to an optical imaging lens. Background Technology

[0004] With the development of technology, portable electronic products have developed rapidly, especially mobile phones and tablets, which have become indispensable in modern life. The imaging equipment mounted on portable electronic products is also rapidly iterating with the advancement of technology, and people have increasingly higher requirements for the quality of optical imaging lenses.

[0005] For high-end imaging lenses with a large number of elements, the design and production are more difficult. They generally have the problem of being difficult to miniaturize and make ultra-thin. In addition, most products are also prone to a series of problems such as stray light, ghosting, low performance yield, poor assembly stability, low relative illumination and poor lens reliability, which affect the image quality and structural stability of the lens.

[0006] Large-sensor lenses can accommodate more pixels while maintaining the same pixel size. To meet this objective requirement, it is currently necessary to design an ultra-thin large-sensor camera lens that, compared to ordinary large-sensor lenses, has better processing feasibility, stray light conditions, assembly stability, and reliability. This would enable the lens to be ultra-thin, improve image quality, and increase performance yield, thus better meeting the application requirements of the main camera in next-generation high-end smartphones.

[0007] Therefore, further exploration and research are needed to find a more reasonable way to arrange the structure of multi-element lenses, and to control and optimize some key parameters of the lens structure such as lenses and spacers, so that the lens can have a better structure and thus improve quality issues such as lens reliability. Summary of the Invention

[0008] The present application provides an optical imaging lens. The optical imaging lens may include a lens barrel, a lens group, and at least seven spacer elements accommodated in 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 in sequence from the object side to the image side along the optical axis. Among them, at least one of the first lens to the fourth lens is a meniscus lens, and the seventh lens and the eighth lens have different positive and negative optical powers; the at least seven spacer elements include a j-th spacer element disposed on the image side of the j-th lens and partially contacting the j-th lens, and a (j - 1)-th spacer element disposed on the image side of the (j - 1)-th lens and partially contacting the (j - 1)-th lens. The optical imaging lens may satisfy: EP(j - 1) / CPj + T(j - 1) / CTj > 0.5, where Ep(j - 1) is the spacing distance of the (j - 1)-th spacer element and the j-th spacer element along the optical axis, CPj is the maximum thickness of the j-th spacer element, T(j - 1) is the air spacing between the (j - 1)-th lens and the j-th lens on the optical axis, and CTj is the central thickness of the j-th lens on the optical axis, where j is taken from 5, 6, or 7.

[0009] In one embodiment, the at least seven spacer elements include a first spacer element disposed on the image side of the first lens and partially contacting the first lens. The radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the inner diameter d1s of the object side surface of the first spacer element, and the inner diameter d1m of the image side surface of the first spacer element may satisfy: (R1 + R2) / (R2 - R1) × (d1s / d1m) > 1.0.

[0010] In one embodiment, the first lens has a positive optical power, its object side surface is convex, and its image side surface is concave; the second lens has a positive optical power, and its object side surface is convex.

[0011] In one embodiment, the at least seven spacer elements include an i-th spacer element disposed on the image side of the i-th lens and partially contacting the i-th lens. The optical imaging lens may satisfy: -100.0 < Rim / CTi + Dis / dis < 100.0, where Rim is the radius of curvature of the image side surface of the i-th lens, CTi is the central thickness of the i-th lens on the optical axis, Dis is the outer diameter of the object side surface of the i-th spacer element, and dis is the inner diameter of the object side surface of the i-th spacer element, where i is taken from 1, 2, 3, or 4.

[0012] In one embodiment, the fifth lens has a negative optical power, its object side surface is convex, and its image side surface is concave.

[0013] In one embodiment, the seventh lens has a positive optical power.

[0014] In one embodiment, the eighth lens has a negative optical power, and its object side surface is concave.

[0015] In one embodiment, the at least seven spacer elements include a j-th spacer element disposed on the image side of the j-th lens and partially contacting the j-th lens, and a (j - 1)-th spacer element disposed on the image side of the (j - 1)-th lens and partially contacting the (j - 1)-th lens. The optical imaging lens satisfies: 1.0 < EP(j - 1) / CPj + T(j - 1) / CTj < 20.0, where Ep(j - 1) is the spacing distance between the (j - 1)-th spacer element and the j-th spacer element along the optical axis, CPj is the maximum thickness of the j-th spacer element, T(j - 1) is the air spacing between the (j - 1)-th lens and the j-th lens on the optical axis, and CTj is the central thickness of the j-th lens on the optical axis, and j is taken from 5, 6, or 7.

[0016] In one embodiment, the at least seven spacer elements include: a seventh spacer element disposed between the seventh lens and the eighth lens, on the image side of the seventh lens and partially contacting the seventh lens, and an eighth spacer element disposed on the image side of the seventh spacer element.

[0017] In one embodiment, the radius of curvature R16 of the image side surface of the eighth lens, the radius of curvature R15 of the object side surface of the eighth lens, the effective focal length f8 of the eighth lens, the inner diameter d7bs of the object side surface of the eighth spacer element, and the inner diameter d7bm of the image side surface of the eighth spacer element satisfy: (R16 - R15) / f8 × (d7bs / d7bm) > 15.0.

[0018] In one embodiment, the radius of curvature R16 of the image side surface of the eighth lens, the radius of curvature R15 of the object side surface of the eighth lens, the effective focal length f8 of the eighth lens, the inner diameter d7bs of the object side surface of the eighth spacer element, and the inner diameter d7bm of the image side surface of the eighth spacer element satisfy: 20.0 < (R16 - R15) / f8 × (d7bs / d7bm) < 80.0.

[0019] In one embodiment, the outer diameter D6s of the object side of the spacer element placed on the image side of the sixth lens and in partial contact with the image side of the sixth lens, the inner diameter d6s of the object side of the spacer element placed on the image side of the sixth lens and in partial contact with the image side of the sixth lens, the spacing distance EP67 between the spacer element placed on the image side of the sixth lens and in partial contact with the image side of the sixth lens and the spacer element placed on the image side of the seventh lens and in partial contact with the image side of the seventh lens along the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis can satisfy: (D6s+d6s) / EP67+T67 / CT6>20.0.

[0020] In one embodiment, the spacing distance EP12 between the first spacer element and the spacer element located on the image side of the second lens and partially in contact with the image side surface of the second lens along the optical axis, the maximum thickness CP1 of the first spacer element, the center thickness CT1 of the first lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis can satisfy: EP12 / CP1+CT1 / T12>10.0.

[0021] In one embodiment, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, the spacing distance EP56 between the spacer element placed on the image side of the fifth lens and partially in contact with the image side surface of the fifth lens and the spacer element placed on the image side of the sixth lens and partially in contact with the image side surface of the sixth lens along the optical axis, the maximum thickness CP6 of the spacer element placed on the image side of the sixth lens and partially in contact with the image side surface of the sixth lens, the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f6 of the sixth lens can satisfy: (T56+CT6) / (EP56+CP6)×(R11 / f6)<0.

[0022] In one embodiment, the inner diameter d0m of the end face closest to the imaging side of the lens barrel, the outer diameter D0m of the end face closest to the imaging side of the lens barrel, the distance L from the end face closest to the subject side to the end face closest to the imaging side of the lens barrel, the distance TD from the object side surface of the first lens to the image side surface of the eighth lens along the optical axis, and the effective focal length f of the optical imaging lens can satisfy: (d0m+D0m) / L+TD / f>2.0.

[0023] In one embodiment, the at least seven spacer elements include flat-corner spacer elements or chamfered spacer elements, wherein the inner hole of the chamfered spacer element has a chamfer in the range of 45° to 60° on its object side or image side.

[0024] In one embodiment, the distance from the center of the effective diameter portion of the object side of the eighth lens to the rear end face of the lens barrel along the optical axis is less than the distance from the edge of the effective diameter portion of the object side of the eighth lens to the rear end face of the lens barrel along the optical axis.

[0025] In one embodiment, the at least seven spacer elements include a fifth spacer element disposed on the image side of the fifth lens and in partial contact with the fifth lens, wherein the radius of curvature R9 of the object side of the fifth lens, the radius of curvature R10 of the image side of the fifth lens, the inner diameter d5s of the object side of the fifth spacer element, and the inner diameter d5m of the image side of the fifth spacer element can satisfy: (R9×R10) / (d5s×d5m)>0.5.

[0026] This application employs an eight-element lens architecture. By rationally matching the optical power and surface shape of each lens, and by appropriately setting the spacers, ensuring that at least one spacer is designed between every two lenses, and that the inner surface of the spacer is attached to the edge of the principal ray but does not intercept it, this helps to intercept excess reflected light paths, improves the image quality of the large-image-size lens, and reduces stray light and ghosting. By setting at least one of the first to fourth lenses to be a meniscus lens, ultra-thin lenses can be achieved under good manufacturing feasibility, providing greater flexibility in the design of mobile phones and other electronic devices. By setting the seventh and eighth lenses to have opposite optical powers, relative illumination is increased, which helps to reduce the lens's refractive power and improve the image quality of the large-image-size lens. By properly controlling the lens edge thickness and the lens center thickness on the optical axis, the lens can be ensured to have good processing feasibility and the accuracy of the bearing position between the assembled lenses can be effectively guaranteed, so that the lens optical parameters meet the design requirements. In addition, it can also prevent interference between the assembled lens and the effective diameter surface of the lens in the optical axis direction, avoid lens appearance problems and performance abnormalities, and enable the fifth, sixth and seventh lenses to have a better air gap value along the optical axis direction after assembly, further improving the appearance and performance yield.

[0027] Therefore, according to the embodiments of this application, an ultra-thin large-image-size optical imaging lens can be provided. Compared with ordinary large-image-size lenses, this optical imaging lens has excellent processing feasibility, stray light state, assembly stability and reliability, etc., realizing ultra-thin lens, improving lens imaging quality, improving performance yield, and can better meet the application requirements of the main camera on the next generation of high-end smartphones. Attached Figure Description

[0028] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0029] Figure 1 A schematic diagram showing the structure and some parameters of an optical imaging lens according to an embodiment of this application is shown;

[0030] Figures 2A to 2C Schematic diagrams of the optical imaging lens according to Embodiment 1 of this application are shown in three different embodiments.

[0031] Figures 3A to 3D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 1 are shown respectively.

[0032] Figures 4A to 4C Schematic diagrams of the optical imaging lens according to Embodiment 2 of this application are shown in three different embodiments.

[0033] Figures 5A to 5D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 2 are shown respectively.

[0034] Figures 6A to 6C Schematic diagrams of the optical imaging lens according to Embodiment 3 of this application are shown in three different embodiments; and

[0035] Figures 7A to 7D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 3 are shown respectively. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The features, principles and other aspects of this application are described in detail below.

[0044] An optical imaging lens according to an exemplary embodiment of this application may include a lens barrel structure, and inside the lens barrel structure may include a plurality of lenses and a plurality of spacer elements arranged along the lens barrel from the subject side to the imaging surface side.

[0045] In an exemplary embodiment, the lens barrel may include, for example, eight lenses, arranged sequentially 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. The lens barrel may also include at least seven spacer elements, wherein at least one spacer element is a flat-angle spacer element, with the same inner diameter on both the object and image sides; at least one spacer element is a chamfered spacer element, with its inner hole having a chamfer ranging from 45° to 60° on either the object or image side. Ensuring that at least one spacer element is designed between two lenses, and that the inner diameter surface of the spacer element is attached to the edge of the principal ray but does not intercept it, helps to intercept excess reflected light paths, improves the imaging quality of large-image-size lenses, and reduces stray light and ghosting. The spacer elements are assembled sequentially with the lens barrel and lenses, ensuring assembly stability. Designing at least one flat-angle spacer element between two lenses ensures that the spacer element effectively intercepts stray light while maintaining good manufacturing feasibility, achieving high-quality imaging. Designing at least one spacer element with a chamfer of 45° or 60° between the two lenses can effectively reduce the reflection area of ​​stray light on the inner diameter surface of the spacer element, thereby achieving higher quality imaging.

[0046] In an exemplary embodiment, among the first four lenses closest to the object side of the optical imaging lens, i.e., among the first to fourth lenses, at least one lens is a meniscus lens, meaning that the object-side and image-side surfaces of at least one lens have opposite convex and concave shapes. In the exemplary embodiment, the seventh and eighth lenses have optical powers with opposite positive and negative values. A reasonable combination of surface shapes and optical powers ensures that the lens can be made ultra-thin while maintaining good manufacturing feasibility, providing greater flexibility in the design of electronic devices such as mobile phones. The first lens has a convex object-side and a concave image-side, effectively ensuring that more light enters the lens, resulting in a larger image of external objects on the chip. The seventh lens has a positive optical power, and the eighth lens has a negative optical power and a concave object-side, effectively ensuring that the main ray of the imaging system has a smaller incident angle when it strikes the image plane, increasing relative illumination and thus improving image quality.

[0047] In an exemplary embodiment, the distance from the center of the effective diameter portion of the object side of the eighth lens to the rear end face of the lens barrel along the optical axis is less than the distance from the edge of the effective diameter portion of the object side of the eighth lens to the rear end face of the lens barrel along the optical axis. This effectively ensures that the principal ray of the imaging lens has a smaller incident angle when it is incident on the image plane, increases relative illumination, helps to reduce the refractive power of the lens, and improves the imaging quality of a large image plane lens.

[0048] In an exemplary embodiment, among the plurality of spacer elements included in the optical imaging lens, the first spacer element closest to the object side is disposed on the image side of the first lens and partially contacts the image side surface of the first lens. The proper use of spacer elements between lenses can effectively reduce stray light, improve lens imaging quality, and enhance lens assembly stability, thereby improving performance yield.

[0049] In an exemplary embodiment, at least one spacer element is provided between the seventh lens and the eighth lens. Using at least one spacer element between the seventh and eighth lenses allows for effective adjustment of field curvature by adjusting the thickness of the spacer element at the field curvature-sensitive location, thereby improving performance yield.

[0050] In an exemplary embodiment, the optical imaging lens of this application can satisfy the condition (R9×R10) / (d5s×d5m)>0.5, where R9 is the radius of curvature of the object side of the fifth lens, R10 is the radius of curvature of the image side of the fifth lens, d5s is the inner diameter of the object side of the spacer element placed on the image side of the fifth lens and in partial contact with the fifth lens, and d5m is the inner diameter of the image side of the spacer element placed on the image side of the fifth lens and in partial contact with the fifth lens. By controlling the radius of curvature of the object-side surface of the fifth lens, the radius of curvature of the image-side surface of the fifth lens, and the inner diameter of the object-side surface of the spacer element placed on the image-side of the fifth lens and partially in contact with the fifth lens, and satisfying (R9×R10) / (d5s×d5m)>0.5, the principal ray has a relatively smooth optical path when passing through the first three lenses, and gradually becomes steeper when passing through the fourth, fifth, sixth, seventh, and eighth lenses. By controlling this condition, the optical parameters can be effectively controlled to improve lens reliability and image quality to a greater extent while meeting design requirements. More specifically, R9, R10, d5s, and d5m can satisfy: (R9×R10) / (d5s×d5m)>1.2.

[0051] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula (R1 + R2) / (R2 - R1)×(d1s / d1m)>1.0, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacer element (a spacer element placed on the image side of the first lens and partially contacting the image side surface of the first lens), and d1m is the inner diameter of the image side surface of the first spacer element. By controlling the curvature radius of the object side surface of the first lens, the curvature radius of the image side surface of the first lens, the inner diameter of the object side surface of the first spacer element, and the inner diameter of the image side surface of the first spacer element to satisfy (R1 + R2) / (R2 - R1)×(d1s / d1m)>1.0, the surface profiles of the object side surface and the image side surface of the lens can be effectively controlled, the lens sensitivity can be reduced, the stray light reflected from the image side of the first lens can be reduced, and the lens performance and the stray light state can be improved. More specifically, R1, R2, d1s, and d1m can satisfy: (R1 + R2) / (R2 - R1)×(d1s / d1m)>1.8.

[0052] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula -100.0 < Rim / CTi + Dis / dis < 100.0 (i = 1, 2, 3, 4), where Rim is the curvature radius of the image side surface of the i-th lens, CTi is the central thickness of the i-th lens on the optical axis, Dis is the outer diameter of the object side surface of the spacer element placed on the image side of the i-th lens and partially contacting the image side surface of the i-th lens, and dis is the inner diameter of the object side surface of the spacer element placed on the image side of the i-th lens and partially contacting the image side surface of the i-th lens. By controlling the curvature radius of the image side surface of the i-th lens, the central thickness of the i-th lens on the optical axis, the outer diameter of the object side surface of the spacer element placed on the image side of the i-th lens, and the inner diameter of the object side surface of the spacer element placed on the image side of the i-th lens to satisfy -100.0 < Rim / CTi + Dis / dis < 100.0 (i = 1, 2, 3, 4), the outer diameter sizes of the first four lenses (the first lens to the fourth lens) can be effectively controlled, so as to effectively control the ratio of the outer diameter of the lens to the central thickness of the lens on the optical axis, which is beneficial to reducing the injection molding risk of the lens. In addition, by controlling the outer diameter sizes of the first four lenses, it is beneficial to ensure the uniformity of the wall thickness of the lens barrel and reduce the risk of abnormal appearance of the lens barrel caused by uneven local wall thickness during injection molding. Controlling the ratio of Dis to dis is beneficial to reducing the stray light formed by the reflection of the optical path between the first four lenses, thereby effectively improving the imaging quality of the lens. More specifically, Rim, CTi, Dis, and dis can satisfy: -85.0 < Rim / CTi + Dis / dis < 85.0 (i = 1, 2, 3, 4).

[0053] In an exemplary embodiment, the optical imaging lens of the present application can satisfy the conditional formula EP(j - 1) / CPj + T(j - 1) / CTj > 0.5 (j = 5, 6, 7), where Ep(j - 1) is the axial spacing distance between the spacer element placed on the image side of the j - 1th lens and in partial contact with the image side surface of the j - 1th lens and the spacer element placed on the image side of the jth lens and in partial contact with the image side surface of the jth lens, CPj is the maximum thickness of the spacer element placed on the image side of the jth lens and in partial contact with the image side surface of the jth lens, T(j - 1) is the air spacing between the j - 1th lens and the jth lens on the optical axis, and CTj is the central thickness of the jth lens on the optical axis. By controlling the axial spacing distance between the spacer element placed on the image side of the j - 1th lens and in partial contact with the image side surface of the j - 1th lens and the spacer element placed on the image side of the jth lens and in partial contact with the image side surface of the jth lens, the maximum thickness of the spacer element placed on the image side of the jth lens and in partial contact with the image side surface of the jth lens, the air spacing between the j - 1th lens and the jth lens on the optical axis, and the central thickness of the jth lens on the optical axis to satisfy EP(j - 1) / CPj + T(j - 1) / CTj > 0.5 (j = 5, 6, 7), reasonably controlling the edge thickness of the lens and the central thickness of the lens on the optical axis can ensure that the lens has good processing feasibility and effectively ensure the accuracy of the bearing position between the lenses after assembly, so that the optical parameters of the lens meet the design requirements. In addition, by reasonably controlling the edge thickness of the lens and the central thickness of the lens on the optical axis, it is also possible to prevent interference between the effective diameter surfaces of the lenses in the optical axis direction after assembly, avoid the occurrence of lens appearance problems and performance abnormality problems, and improve the appearance and performance yield. Preferably, EP(j - 1), CPj, T(j - 1), and CTj can satisfy: 1.0 < EP(j - 1) / CPj + T(j - 1) / CTj < 20.0 (j = 5, 6, 7). By controlling this conditional formula, it can ensure that the lens has good processing feasibility, achieve effective control of the accuracy of the bearing position between the lenses after assembly, and prevent interference between the effective diameter surfaces of the lenses in the optical axis direction after assembly, effectively avoiding the occurrence of lens appearance problems and performance abnormality problems; it can make the fifth, sixth, and seventh lenses have a better air gap value along the optical axis direction after assembly, further improving the appearance and performance yield.

[0054] In an exemplary embodiment, two spacer elements may be included between the seventh lens and the eighth lens. One of them may be a seventh spacer element placed on the image side of the seventh lens and partially in contact with the image side surface of the seventh lens, and the other may be an eighth spacer element placed on the image side of the seventh spacer element. The spacer element (seventh spacer element) placed on the image side of the seventh lens and partially in contact with the image side surface of the seventh lens can effectively avoid the lens injection molding risk and assembly stability caused by the large structural difference between the seventh and eighth lenses, and can effectively improve lens reliability and lens formability. However, the inner diameter surface design of this spacer element is not attached to the edge of the principal ray, and cannot effectively intercept stray light reflected between the first seven lenses. Therefore, the inner diameter surface structure of the second spacer element (eighth spacer element) placed on the image side of the seventh lens and partially in contact with the seventh lens is designed to be attached to the edge of the principal ray. This design can effectively intercept stray light and improve the lens imaging quality.

[0055] In an exemplary embodiment, the optical imaging lens of this application can satisfy the condition (R16-R15) / f8×(d7bs / d7bm)>15.0, where R16 is the radius of curvature of the image side of the eighth lens, R15 is the radius of curvature of the object side of the eighth lens, f8 is the effective focal length of the eighth lens, d7bs is the inner diameter of the object side of the last spacer (eighth spacer) arranged sequentially from the object side to the image side and placed on the image side of the seventh spacer (spacer that is placed on the image side of the seventh lens and partially contacts the seventh lens), and d7bm is the inner diameter of the image side of the last spacer (eighth spacer) arranged sequentially from the object side to the image side and placed on the image side of the seventh spacer. By controlling the radius of curvature of the image side of the eighth lens, the radius of curvature of the object side of the eighth lens, the effective focal length of the eighth lens, and the inner diameter of the object side and the inner diameter of the image side of the next spacer element placed on the image side of the seventh spacer element arranged sequentially from the object side to the image side, the condition (R16-R15) / f8×(d7bs / d7bm)>15.0 can be met. The eighth lens is the lens with the largest outer diameter in the 8P large image plane lens, which has a greater molding risk and a greater risk of stray light generation. By controlling this condition, the surface shape of the eighth lens can be effectively controlled, ensuring that the surface shape curve of the image plane is smooth. The wavefront curve of the sol during injection molding is relatively smooth, without convergence and encapsulation, reducing the risk of weld lines, thereby reducing the risk of stray light and appearance problems at the weld lines. Controlling the inner diameter of the object-image side of the spacer element placed on the image side of the seventh lens and partially in contact with the seventh lens (the eighth spacer element) can effectively intercept the reflected light path and the reflection area, improving the lens imaging quality. Preferably, R16, R15, f8, d7bs, and d7bm can satisfy: 20.0 < (R16-R15) / f8×(d7bs / d7bm) < 80.0. By controlling this condition, it can be ensured that lenses with larger outer diameters have good processing feasibility, further reduce the risk of weld lines and stray light, effectively intercept reflected light paths, reduce the number of stray light spots formed on the image plane, and further improve the lens imaging quality.

[0056] In an exemplary embodiment, the optical imaging lens of this application can satisfy the condition (D6s+d6s) / EP67+T67 / CT6>20.0, where D6s is the outer diameter of the object side of the spacer element placed on the image side of the sixth lens and in partial contact with the image side of the sixth lens, d6s is the inner diameter of the object side of the spacer element placed on the image side of the sixth lens and in partial contact with the image side of the sixth lens, EP67 is the distance between the spacer element placed on the image side of the sixth lens and in partial contact with the image side of the sixth lens and the spacer element placed on the image side of the seventh lens and in partial contact with the image side of the seventh lens along the optical axis, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, and CT6 is the center thickness of the sixth lens on the optical axis. By controlling the outer diameter of the object side of the spacer element placed on the image side of the sixth lens and partially in contact with the image side of the sixth lens, the inner diameter of the object side of the spacer element placed on the image side of the sixth lens and partially in contact with the image side of the sixth lens, the spacing distance along the optical axis between the spacer element placed on the image side of the sixth lens and partially in contact with the image side of the sixth lens and the spacer element placed on the image side of the seventh lens and partially in contact with the image side of the seventh lens, and the air gap between the sixth and seventh lenses on the optical axis and the center thickness of the sixth lens on the optical axis satisfying (D6s+d6s) / EP67+T67 / CT6>20.0, the rationality of the overall structure of the large image sensor lens can be guaranteed. The distance along the optical axis from the object side of the first lens to the image side of the eighth lens is determined by the entire optical path. By controlling this conditional expression, it is helpful to further control the ratio of T67 / CT6, which can ensure that the design of the air gap in the lens is reasonable, and ensure the good formability and assembly stability of the lens. More specifically, D6s, d6s, EP67, T67, and CT6 can satisfy: (D6s+d6s) / EP67+T67 / CT6>27.0.

[0057] In an exemplary embodiment, the optical imaging lens of this application can satisfy the condition EP12 / CP1+CT1 / T12>10.0, where EP12 is the distance along the optical axis between the first spacer element and the spacer element located on the image side of the second lens and partially in contact with the image side of the second lens; CP1 is the maximum thickness of the first spacer element; CT1 is the center thickness of the first lens on the optical axis; and T12 is the air gap between the first and second lenses on the optical axis. By controlling the distance along the optical axis between the first spacer element and the spacer element located on the image side of the second lens and partially in contact with the image side of the second lens, the maximum thickness of the first spacer element, the center thickness of the first lens on the optical axis, and the air gap between the first and second lenses on the optical axis to satisfy EP12 / CP1+CT1 / T12>10.0, interference between lenses along the optical axis after assembly can be effectively avoided, reducing the difficulty of lens assembly and improving the feasibility of lens processing. More specifically, EP12, CP1, CT1, and T12 can satisfy: EP12 / CP1+CT1 / T12>14.0.

[0058] In an exemplary embodiment, the optical imaging lens of this application can satisfy the condition (T56+CT6) / (EP56+CP6)×(R11 / f6)<0, where T56 is the air gap between the fifth lens and the sixth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, EP56 is the distance along the optical axis between the spacer element placed on the image side of the fifth lens and partially in contact with the image side surface of the fifth lens and the spacer element placed on the image side of the sixth lens and partially in contact with the image side surface of the sixth lens, CP6 is the maximum thickness of the spacer element placed on the image side of the sixth lens and partially in contact with the image side surface of the sixth lens, R11 is the radius of curvature of the object side surface of the sixth lens, and f6 is the effective focal length of the sixth lens. By controlling the air gap between the fifth and sixth lenses on the optical axis, the center thickness of the sixth lens on the optical axis, the spacing distance along the optical axis between the spacer element placed on the image side of the fifth lens and partially in contact with the image side of the fifth lens, the maximum thickness of the spacer element placed on the image side of the sixth lens and partially in contact with the image side of the sixth lens, the radius of curvature of the object side of the sixth lens, and the effective focal length of the sixth lens, it is beneficial to control the incident angle of off-axis field rays on the imaging plane, increasing the matching with the photosensitive element and bandpass filter. Furthermore, it is beneficial to control the thickness ratio and surface shape of the sixth lens, ensuring good fabrication feasibility. More specifically, T56, CT6, EP56, CP6, R11, and f6 can satisfy: (T56+CT6) / (EP56+CP6)×(R11 / f6)<-1.

[0059] In an exemplary embodiment, the optical imaging lens of this application can satisfy the condition (d0m+D0m) / L+TD / f>2.0, where d0m is the inner diameter of the end face of the lens barrel closest to the imaging side, D0m is the outer diameter of the end face of the lens barrel closest to the imaging side, L is the distance from the end face of the lens barrel closest to the subject to the end face closest to the imaging side, TD is the distance along the optical axis from the object side of the first lens to the image side of the eighth lens, and f is the effective focal length of the optical imaging lens. By controlling the inner diameter of the lens barrel closest to the imaging side, the outer diameter of the lens barrel closest to the imaging side, the distance from the end face of the lens barrel closest to the subject to the end face closest to the imaging side, and the distance along the optical axis from the object side of the first lens to the image side of the eighth lens, and the effective focal length of the optical imaging lens, the size of the rear end of the large image sensor lens and the height of the lens barrel can be effectively controlled. This helps to ensure the size of the large end of the lens and the overall height of the lens barrel, contributing to the ultra-thin and miniaturized characteristics of the lens. It also helps to further control the TD / f ratio, effectively ensuring image quality. More specifically, d0m, D0m, L, TD, and f can satisfy: (d0m+D0m) / L+TD / f>3.4.

[0060] In an exemplary embodiment, the fifth lens can have negative optical power, its object-side surface can be convex, and its image-side surface can be concave. This ensures good manufacturability while effectively shortening the overall lens length, achieving the ultra-thin characteristics of a large image sensor lens. The seventh lens can have positive optical power, which helps ensure that the lens's refraction of the incident parallel beam is converging. The eighth lens can have negative optical power, and its object-side surface can be concave. A reasonable combination of optical power and surface shape can effectively reduce the lens's refractive power and improve the imaging quality of the large image sensor lens.

[0061] In an exemplary embodiment, the first lens may have positive optical power, with its object-side surface being convex and its image-side surface being concave. The convex object-side surface of the first lens helps ensure a smaller incident angle when the main ray of the imaging system strikes the image plane, effectively reducing the outer diameter of the first lens, and consequently reducing the outer diameter of the snap-fit ​​lens, thereby reducing the head size of the 8P large image-plane lens and making the lens structure more compact. The second lens may also have positive optical power, with its object-side surface being convex. A reasonable combination of optical power and surface shape can effectively increase the lens's refractive power, improve the imaging quality of the large image-plane lens, and achieve ultra-thin characteristics.

[0062] In an exemplary embodiment, the optical imaging lens of this application may include at least one aperture stop. The aperture stop can constrain the optical path and control the light intensity. The aperture stop can be disposed at an appropriate position on the optical imaging lens; for example, the aperture stop can be disposed between the object side and the first lens.

[0063] In an exemplary embodiment, the optical imaging lens may optionally include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0064] In an exemplary embodiment, the effective focal length f of the optical imaging lens can be, for example, in the range of 4.7mm to 5.5mm; the effective focal length f1 of the first lens can be, for example, in the range of 6.0mm to 6.9mm; the effective focal length f2 of the second lens can be, for example, in the range of 14.5mm to 16.4mm; the effective focal length f3 of the third lens can be, for example, in the range of -23.1mm to -11.6mm; the effective focal length f4 of the fourth lens can be, for example, in the range of 7.9mm to 10.3mm; the effective focal length f5 of the fifth lens can be, for example, in the range of -12.5mm to -10.0mm; the effective focal length f6 of the sixth lens can be, for example, in the range of 8.1mm to 9.2mm; the effective focal length f7 of the seventh lens can be, for example, in the range of 14.6mm to 32.0mm; and the effective focal length f8 of the eighth lens can be, for example, in the range of -3.1mm to -2.7mm.

[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 and surface shape of each lens, and by rationally setting each spacing element, an ultra-thin large-image-size optical imaging lens can be provided. Compared with ordinary large-image-size lenses, this optical imaging lens has excellent manufacturing feasibility, stray light conditions, and reliability, and can better meet the application requirements of the main camera on next-generation high-end smartphones.

[0066] In embodiments of this application, at least one of the mirror surfaces of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses may be an aspherical mirror surface; that is, at least one aspherical mirror surface may be included from the object-side surface of the first lens to the image-side surface of the eighth lens. 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, at least one of the object-side and image-side surfaces of each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses may be an aspherical mirror surface. Optionally, the object-side surface and image-side surface of each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses are aspherical mirror surfaces.

[0067] However, those skilled in the art will understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging lens, as well as the number of spacers, can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiment, the optical imaging lens is not limited to including eight lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0068] 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.

[0069] Example 1

[0070] The following is for reference Figures 2A to 2C as well as Figures 3A to 3D Describes an optical imaging lens according to Embodiment 1 of this application. Figures 2A to 2C Schematic diagrams of the optical imaging lens according to Embodiment 1 of this application are shown in three different embodiments.

[0071] like Figures 2A to 2C As shown, the optical imaging lens includes a lens barrel 100 and, housed within the lens barrel 100, 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 arranged sequentially along the optical axis from the object side to the image side.

[0072] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The optical imaging lens may also include a filter E9 (not shown), which may have an object-side surface S17 and an image-side surface S18. The optical imaging lens may also include an imaging surface S19 (not shown), on which light from the object may pass sequentially through the surfaces S1 to S18 and finally be imaged.

[0073] Table 1 shows the basic parameters of the optical imaging lens of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0074]

[0075] Table 1

[0076] 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:

[0077]

[0078] 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. Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6, A8, A16, A27, A18, A19 ... 10 A 12 A 14 A 16 A 18 A 20 A 22 and A 24 .

[0079]

[0080]

[0081] Table 2-1

[0082] Face number A16 A18 A20 A22 A24 S1 -8.9591E-06 4.1271E-06 -8.1524E-07 0.0000E+00 0.0000E+00 S2 -9.7789E-05 -4.8838E-05 -1.2936E-06 0.0000E+00 0.0000E+00 S3 -2.8750E-05 1.0853E-06 -4.8408E-06 0.0000E+00 0.0000E+00 S4 5.7759E-05 -6.3054E-06 3.7211E-06 0.0000E+00 0.0000E+00 S5 3.1846E-04 1.9330E-05 6.0346E-07 0.0000E+00 0.0000E+00 S6 3.0639E-05 9.1177E-06 2.6777E-06 0.0000E+00 0.0000E+00 S7 -6.1185E-07 1.5288E-05 -6.9808E-06 0.0000E+00 0.0000E+00 S8 -1.4539E-04 1.4530E-04 -3.8326E-05 0.0000E+00 0.0000E+00 S9 -3.5697E-04 1.7506E-04 -7.4464E-05 0.0000E+00 0.0000E+00 S10 -3.6215E-04 1.0863E-04 -5.4631E-05 0.0000E+00 0.0000E+00 S11 1.1383E-05 -1.2792E-05 -4.4608E-05 0.0000E+00 0.0000E+00 S12 1.3235E-03 -5.6635E-04 -2.5708E-04 9.8490E-05 0.0000E+00 S13 6.4780E-04 -1.1732E-03 3.9006E-04 2.9108E-04 -1.4523E-04 S14 5.9263E-04 -1.3947E-03 -1.2094E-03 -6.4072E-04 1.8205E-04 S15 2.5515E-04 5.3557E-04 1.5350E-04 3.0029E-04 -1.2697E-04 S16 2.8926E-03 -1.0448E-03 6.3858E-04 5.3859E-04 -2.6511E-04

[0083] Table 2-2

[0084] For example, such as Figure 2AAs shown, according to Embodiment 1-1, the optical imaging lens may further include spacer elements disposed between the lenses and housed in the lens barrel 100. For example, spacer element P1 (first spacer element) is disposed on the image side of the first lens and in contact with the image side surface of the first lens; spacer element P2 is disposed on the image side of the second lens and in contact with the image side surface of the second lens; spacer element P3 is disposed on the image side of the third lens and in contact with the image side surface of the third lens; spacer element P4 is disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; spacer element P5 is disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; spacer element P6 (sixth spacer element) is disposed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; spacer element P6b is disposed between the image side surface of the sixth spacer element P6 and the object side surface of the seventh lens; spacer element P7 (seventh spacer element) is disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens; and spacer element P7b (eighth spacer element) is disposed between the image side surface of the seventh spacer element P7 and the object side surface of the eighth lens.

[0085] In Example 1-1, the relevant parameter values ​​are shown in Table 3-1 below, where d1s is the inner diameter of the object side of the spacer element (first spacer element, P1) placed on the image side of the first lens and in partial contact with the image side of the first lens; d1m is the inner diameter of the image side of the spacer element (first spacer element, P1) placed on the image side of the first lens and in partial contact with the image side of the first lens; D1s is the outer diameter of the object side of the spacer element (first spacer element, P1) placed on the image side of the first lens and in partial contact with the image side of the first lens; d2s is the inner diameter of the object side of the spacer element (P2) placed on the image side of the second lens and in partial contact with the image side of the second lens; D2s is the outer diameter of the object side of the spacer element (P2) placed on the image side of the second lens and in partial contact with the image side of the second lens. The outer diameter of the object side of the spacer element (P2) that is in contact with the image side of the third lens; the inner diameter of the object side of the spacer element (P3) that is placed on the image side of the third lens and is in contact with the image side of the third lens; the outer diameter of the object side of the spacer element (P3) that is placed on the image side of the third lens and is in contact with the image side of the third lens; the inner diameter of the object side of the spacer element (P4) that is placed on the image side of the fourth lens and is in contact with the image side of the fourth lens; the outer diameter of the object side of the spacer element (P4) that is placed on the image side of the fourth lens and is in contact with the image side of the fourth lens; the inner diameter of the object side of the spacer element (P5) that is placed on the image side of the fifth lens and is in contact with the image side of the fifth lens. d5m is the inner diameter of the image-side surface of the spacer element (P5) placed on the image side of the fifth lens and in partial contact with the image-side surface of the fifth lens; d6s is the inner diameter of the object-side surface of the spacer element (P6) placed on the image side of the sixth lens and in partial contact with the image-side surface of the sixth lens; D6s is the outer diameter of the object-side surface of the spacer element (P6) placed on the image side of the sixth lens and in partial contact with the image-side surface of the sixth lens; EP45 is the spacing along the optical axis between the spacer element (P4) placed on the image side of the fourth lens and in partial contact with the image-side surface of the fourth lens and the spacer element (P5) placed on the image side of the fifth lens and in partial contact with the image-side surface of the fifth lens; CP5 is the center thickness of the fifth lens along the optical axis; EP56 is the thickness of the spacer element placed on the image side of the fifth lens. The spacing between the spacer element (P5) that contacts the image side of the fifth lens and the spacer element (P6) that is located on the image side of the sixth lens and contacts the image side of the sixth lens, along the optical axis; CP6 is the center thickness of the sixth lens on the optical axis; EP67 is the spacing between the spacer element (P6) that is located on the image side of the sixth lens and contacts the image side of the sixth lens and the spacer element (seventh spacer element, P7) that is located on the image side of the seventh lens and contacts the image side of the seventh lens, along the optical axis; CP7 is the center thickness of the seventh lens on the optical axis; d7bs is the inner diameter of the object side of the spacer element (eighth spacer element, P7b) located between the image side of the seventh spacer element (P7) and the object side of the eighth lens.And d7bm is the inner diameter of the image-side surface of the spacer element (eighth spacer element, P7b) placed between the image-side surface of the seventh spacer element (P7) and the object-side surface of the eighth lens. All parameters in Table 3-1 are in millimeters (mm).

[0086] d1s d1m D1s d2s D2s d3s D3s d4s D4s d5s d5m 2.380 2.380 3.112 2.440 3.332 2.540 4.600 2.860 5.000 3.240 3.240

[0087] d6s D6s EP45 CP5 EP56 CP6 EP67 CP7 d7bs d7bm 5.328 6.000 0.236 0.022 0.466 0.324 0.346 0.411 7.840 7.840

[0088] Table 3-1

[0089] For example, such as Figure 2B As shown, according to embodiments 1-2, the optical imaging lens may further include spacer elements disposed between the lenses and housed in the lens barrel 100. For example, spacer element P1 (first spacer element) is disposed on the image side of the first lens and in contact with the image side surface of the first lens; spacer element P2 is disposed on the image side of the second lens and in contact with the image side surface of the second lens; spacer element P3 is disposed on the image side of the third lens and in contact with the image side surface of the third lens; spacer element P4 is disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; spacer element P5 is disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; spacer element P6 (sixth spacer element) is disposed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; spacer element P6b is disposed between the image side surface of the sixth spacer element P6 and the object side surface of the seventh lens; spacer element P7 (seventh spacer element) is disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens; and spacer element P7b (eighth spacer element) is disposed between the image side surface of the seventh spacer element P7 and the object side surface of the eighth lens.

[0090] In Examples 1-2, the relevant parameter values ​​are shown in Table 3-2 below. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter is millimeters (mm).

[0091] d1s d1m D1s d2s D2s d3s D3s d4s D4s d5s d5m 2.412 2.380 3.112 2.472 3.332 2.576 4.600 2.896 5.000 3.284 3.240

[0092] d6s D6s EP45 CP5 EP56 CP6 EP67 CP7 d7bs d7bm 5.328 6.000 0.236 0.022 0.466 0.324 0.346 0.411 7.884 7.840

[0093] Table 3-2

[0094] For example, such as Figure 2CAs shown, according to embodiments 1-3, the optical imaging lens may further include a spacer element disposed between the lenses and housed in the lens barrel 100. For example, spacer element P1 (first spacer element) is placed on the image side of the first lens and in contact with the image side surface of the first lens; spacer element P2 is placed on the image side of the second lens and in contact with the image side surface of the second lens; spacer element P3 is placed on the image side of the third lens and in contact with the image side surface of the third lens; spacer element P4 is placed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; spacer element P5 is placed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; spacer element P6 (sixth spacer element) is placed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; spacer element P6b is placed between the image side surface of the sixth spacer element P6 and the object side surface of the seventh lens; spacer element P7 (seventh spacer element) is placed on the image side of the seventh lens and in contact with the image side surface of the seventh lens; spacer element P7b (eighth spacer element) is placed between the image side surface of the seventh spacer element P7 and the object side surface of the eighth lens; and spacer element P8 is placed on the image side of the eighth lens and in contact with the image side surface of the eighth lens.

[0095] In Examples 1-3, the relevant parameter values ​​are shown in Table 3-3 below. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter is millimeters (mm).

[0096] d1s d1m D1s d2s D2s d3s D3s d4s D4s d5s d5m 2.436 2.380 3.112 2.496 3.332 2.602 4.600 2.922 5.000 3.316 3.240

[0097] d6s D6s EP45 CP5 EP56 CP6 EP67 CP7 d7bs d7bm 5.328 6.000 0.236 0.022 0.466 0.324 0.346 0.411 7.916 7.840

[0098] Table 3-3

[0099] Figure 3A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 3B The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 3D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 3A to 3D It can be seen that the optical imaging lens given in Example 1 can achieve good imaging quality.

[0100] Example 2

[0101] The following is for reference Figures 4A to 4C as well as Figures 5A to 5DThis paper describes an optical imaging lens according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments. Figures 4A to 4C Schematic diagrams of the optical imaging lens according to Embodiment 2 of this application are shown in three different embodiments.

[0102] like Figures 4A to 4C As shown, the optical imaging lens includes a lens barrel 100 and, housed within the lens barrel 100, 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 arranged sequentially along the optical axis from the object side to the image side.

[0103] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The optical imaging lens may also include a filter E9 (not shown), which may have an object-side surface S17 and an image-side surface S18. The optical imaging lens may also include an imaging surface S19 (not shown), on which light from the object may pass sequentially through the surfaces S1 to S18 and finally be imaged.

[0104] Table 4 shows the basic parameters of the optical imaging lens of Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm). Tables 5-1 and 5-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1 to S16 in Example 2. 10 A 12 A 14 A 16 A 18 A 20 A 22 and A 24 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0105]

[0106] Table 4

[0107] Face number A4 A6 A8 A10 A12 A14 S1 3.8153E-04 1.2862E-03 2.7814E-04 8.3449E-05 -3.4511E-05 1.3508E-08 S2 -2.7648E-02 6.5367E-04 1.1406E-03 -7.2056E-05 -4.2497E-05 -7.1227E-05 S3 -8.0605E-02 1.1433E-03 1.2742E-03 -3.2191E-04 -1.6823E-04 6.7299E-06 S4 -9.8020E-02 3.2452E-03 9.6383E-04 -8.9618E-04 9.3283E-05 2.5296E-06 S5 -8.0487E-02 1.0445E-02 1.7103E-03 -6.5346E-04 1.4444E-04 -5.2478E-05 S6 -1.2193E-02 1.5202E-02 4.7569E-03 5.8212E-04 2.4579E-04 -4.3522E-05 S7 3.0662E-02 -1.8524E-02 3.1582E-03 4.6297E-04 4.7786E-04 2.2637E-05 S8 1.0226E-01 -2.4886E-02 1.4863E-03 -3.2393E-03 -2.1232E-03 -4.7190E-04 S9 -3.8444E-01 4.7714E-02 -4.4881E-03 2.0940E-04 -3.8515E-03 -3.0716E-04 S10 -6.2603E-01 6.3085E-02 -3.6216E-03 8.2839E-03 -1.4865E-03 4.2368E-04 S11 -4.4623E-01 -4.4665E-02 4.6963E-03 9.8601E-03 2.3464E-03 2.4161E-04 S12 -1.7248E-01 1.0378E-01 -7.9219E-03 -6.4788E-03 -3.8627E-03 2.1427E-03 S13 -1.8303E+00 5.4502E-01 -1.0260E-01 -1.0025E-02 7.6453E-03 -1.0692E-03 S14 -1.1701E+00 3.6130E-02 -6.9228E-03 4.5070E-03 8.8261E-03 4.7765E-03 S15 3.2750E+00 -7.7254E-01 3.1701E-01 -1.2346E-01 5.3655E-02 -1.7029E-02 S16 -1.0661E+00 -1.4822E-01 1.3009E-01 -4.4941E-02 1.3873E-02 -1.0096E-02

[0108] Table 5-1

[0109]

[0110]

[0111] Table 5-2

[0112] For example, such as Figure 4A As shown, according to Embodiment 2-1, the optical imaging lens may further include spacer elements disposed between the lenses and housed in the lens barrel 100. For example, spacer element P1 (first spacer element) is disposed on the image side of the first lens and in contact with the image side surface of the first lens; spacer element P2 is disposed on the image side of the second lens and in contact with the image side surface of the second lens; spacer element P3 is disposed on the image side of the third lens and in contact with the image side surface of the third lens; spacer element P4 is disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; spacer element P5 is disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; spacer element P6 (sixth spacer element) is disposed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; spacer element P6b is disposed between the image side surface of the sixth spacer element P6 and the object side surface of the seventh lens; spacer element P7 (seventh spacer element) is disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens; and spacer element P7b (eighth spacer element) is disposed between the image side surface of the seventh spacer element P7 and the object side surface of the eighth lens.

[0113] In Example 2-1, the relevant parameter values ​​are shown in Table 6-1 below. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter is millimeters (mm).

[0114] d1s d1m D1s d2s D2s d3s D3s d4s D4s d5s d5m 2.420 2.420 3.312 2.460 3.532 2.500 4.800 2.840 5.400 3.200 3.200

[0115] d6s D6s EP45 CP5 EP56 CP6 EP67 CP7 d7bs d7bm 5.528 6.196 0.227 0.022 0.444 0.334 0.362 0.387 7.680 7.680

[0116] Table 6-1

[0117] For example, such as Figure 4BAs shown in Embodiment 2-2, the optical imaging lens may further include spacer elements disposed between the lenses and housed in the lens barrel 100. For example, spacer element P1 (first spacer element) is disposed on the image side of the first lens and in contact with the image side surface of the first lens; spacer element P2 is disposed on the image side of the second lens and in contact with the image side surface of the second lens; spacer element P3 is disposed on the image side of the third lens and in contact with the image side surface of the third lens; spacer element P4 is disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; spacer element P5 is disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; spacer element P6 (sixth spacer element) is disposed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; spacer element P6b is disposed between the image side surface of the sixth spacer element P6 and the object side surface of the seventh lens; spacer element P7 (seventh spacer element) is disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens; and spacer element P7b (eighth spacer element) is disposed between the image side surface of the seventh spacer element P7 and the object side surface of the eighth lens.

[0118] In Example 2-2, the relevant parameter values ​​are shown in Table 6-2 below. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter is millimeters (mm).

[0119] d1s d1m D1s d2s D2s d3s D3s d4s D4s d5s d5m 2.452 2.420 3.312 2.492 3.532 2.532 4.800 2.872 5.400 3.244 3.200

[0120] d6s D6s EP45 CP5 EP56 CP6 EP67 CP7 d7bs d7bm 5.528 6.196 0.227 0.022 0.444 0.334 0.362 0.387 7.712 7.680

[0121] Table 6-2

[0122] For example, such as Figure 4CAs shown, according to embodiments 2-3, the optical imaging lens may further include spacer elements disposed between the lenses and housed in the lens barrel 100. For example, spacer element P1 (first spacer element) is placed on the image side of the first lens and in contact with the image side surface of the first lens; spacer element P2 is placed on the image side of the second lens and in contact with the image side surface of the second lens; spacer element P3 is placed on the image side of the third lens and in contact with the image side surface of the third lens; spacer element P4 is placed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; spacer element P5 is placed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; spacer element P6 (sixth spacer element) is placed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; spacer element P6b is placed between the image side surface of the sixth spacer element P6 and the object side surface of the seventh lens; spacer element P7 (seventh spacer element) is placed on the image side of the seventh lens and in contact with the image side surface of the seventh lens; spacer element P7b (eighth spacer element) is placed between the image side surface of the seventh spacer element P7 and the object side surface of the eighth lens; and spacer element P8 is placed on the image side of the eighth lens and in contact with the image side surface of the eighth lens.

[0123] In Examples 2-3, the relevant parameter values ​​are shown in Table 6-3 below. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter is millimeters (mm).

[0124] d1s d1m D1s d2s D2s d3s D3s d4s D4s d5s d5m 2.476 2.420 3.312 2.516 3.532 2.556 4.800 2.896 5.400 3.276 3.200

[0125] d6s D6s EP45 CP5 EP56 CP6 EP67 CP7 d7bs d7bm 5.528 6.196 0.227 0.022 0.444 0.334 0.362 0.387 7.736 7.680

[0126] Table 6-3

[0127] Figure 5A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 5B The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 5D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 5A to 5D It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0128] Example 3

[0129] The following is for reference Figures 6A to 6C as well as Figures 7A to 7D An optical imaging lens according to Embodiment 3 of this application is described. Figures 6A to 6C Schematic diagrams of the optical imaging lens according to Embodiment 3 of this application are shown in three different embodiments.

[0130] like Figures 6A to 6C As shown, the optical imaging lens includes a lens barrel 100 and, housed within the lens barrel 100, 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 arranged sequentially along the optical axis from the object side to the image side.

[0131] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The optical imaging lens may also include a filter E9 (not shown), which may have an object-side surface S17 and an image-side surface S18. The optical imaging lens may also include an imaging surface S19 (not shown), on which light from the object may pass sequentially through the surfaces S1 to S18 and finally be imaged.

[0132] Table 7 shows the basic parameters of the optical imaging lens of Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm). Tables 8-1 and 8-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1 to S16 in Example 3. 10 A 12 A 14 A 16 A 18 A 20 A 22 and A 24 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0133]

[0134] Table 7

[0135]

[0136]

[0137] Table 8-1

[0138] Face number A16 A18 A20 A22 A24 S1 5.9754E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -1.2632E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 5.7823E-05 6.5570E-08 0.0000E+00 0.0000E+00 0.0000E+00 S4 4.7049E-05 3.6312E-08 0.0000E+00 0.0000E+00 0.0000E+00 S5 -1.0012E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -1.3343E-05 -5.8836E-08 0.0000E+00 0.0000E+00 0.0000E+00 S7 5.8468E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 2.2548E-04 2.8077E-06 0.0000E+00 0.0000E+00 0.0000E+00 S9 4.9191E-04 6.1832E-06 1.1636E-07 0.0000E+00 0.0000E+00 S10 3.4366E-04 2.7515E-06 0.0000E+00 0.0000E+00 0.0000E+00 S11 -2.3905E-04 -1.5870E-05 -1.4941E-06 0.0000E+00 0.0000E+00 S12 -4.7051E-04 -2.6099E-05 -2.4188E-06 -2.4186E-07 0.0000E+00 S13 -7.8138E-04 -6.6641E-05 -8.4612E-06 -1.1859E-06 -1.5569E-07 S14 1.6033E-04 2.2466E-05 2.3982E-06 0.0000E+00 0.0000E+00 S15 1.0632E-03 3.0843E-05 1.5635E-06 8.9417E-08 0.0000E+00 S16 9.7298E-04 5.2317E-05 4.5362E-06 4.2270E-07 0.0000E+00

[0139] Table 8-2

[0140] For example, such as Figure 6A As shown, according to Embodiment 3-1, the optical imaging lens may further include spacer elements disposed between the lenses and housed in the lens barrel 100. For example, spacer element P1 (first spacer element) is disposed on the image side of the first lens and in contact with the image side surface of the first lens; spacer element P2 is disposed on the image side of the second lens and in contact with the image side surface of the second lens; spacer element P3 is disposed on the image side of the third lens and in contact with the image side surface of the third lens; spacer element P4 is disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; spacer element P5 is disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; spacer element P6 is disposed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; spacer element P7 (seventh spacer element) is disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens; and spacer element P7b (eighth spacer element) is disposed between the image side surface of the seventh spacer element P7 and the object side surface of the eighth lens.

[0141] In Example 3-1, the relevant parameter values ​​are shown in Table 9-1 below. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter is millimeters (mm).

[0142] d1s d1m D1s d2s D2s d3s D3s d4s D4s d5s d5m 2.720 2.720 4.720 2.680 3.928 2.600 5.000 2.860 5.200 3.460 3.460

[0143] d6s D6s EP45 CP5 EP56 CP6 EP67 CP7 d7bs d7bm 4.760 7.200 0.222 0.018 0.425 0.018 0.340 0.483 7.160 7.160

[0144] Table 9-1

[0145] For example, such as Figure 6BAs shown, according to Embodiment 3-2, the optical imaging lens may further include spacer elements disposed between the lenses and housed in the lens barrel 100. For example, spacer element P1 (first spacer element) is disposed on the image side of the first lens and in contact with the image side surface of the first lens; spacer element P2 is disposed on the image side of the second lens and in contact with the image side surface of the second lens; spacer element P3 is disposed on the image side of the third lens and in contact with the image side surface of the third lens; spacer element P4 is disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; spacer element P5 is disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; spacer element P6 is disposed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; spacer element P7 (seventh spacer element) is disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens; and spacer element P7b (eighth spacer element) is disposed between the image side surface of the seventh spacer element P7 and the object side surface of the eighth lens.

[0146] In Example 3-2, the relevant parameter values ​​are shown in Table 9-2 below. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter is millimeters (mm).

[0147] d1s d1m D1s d2s D2s d3s D3s d4s D4s d5s d5m 2.756 2.720 4.720 2.716 3.928 2.636 5.000 2.896 5.200 3.496 3.460

[0148] d6s D6s EP45 CP5 EP56 CP6 EP67 CP7 d7bs d7bm 4.796 7.200 0.222 0.018 0.425 0.018 0.340 0.483 7.196 7.160

[0149] Table 9-2

[0150] For example, such as Figure 6C As shown, according to Embodiment 3-3, the optical imaging lens may further include spacer elements disposed between the lenses and housed in the lens barrel 100. For example, spacer element P1 (first spacer element) is disposed on the image side of the first lens and in contact with the image side surface of the first lens; spacer element P2 is disposed on the image side of the second lens and in contact with the image side surface of the second lens; spacer element P3 is disposed on the image side of the third lens and in contact with the image side surface of the third lens; spacer element P4 is disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens; spacer element P5 is disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; spacer element P6 is disposed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; spacer element P7 (seventh spacer element) is disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens; spacer element P7b (eighth spacer element) is disposed between the image side surface of the seventh spacer element P7 and the object side surface of the eighth lens; and spacer element P8 is disposed on the image side of the eighth lens and in contact with the image side surface of the eighth lens.

[0151] In Example 3-3, the relevant parameter values ​​are shown in Table 9-3 below. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter is millimeters (mm).

[0152] d1s d1m D1s d2s D2s d3s D3s d4s D4s d5s d5m 2.782 2.720 4.720 2.756 3.928 2.662 5.000 2.922 5.200 3.522 3.460

[0153] d6s D6s EP45 CP5 EP56 CP6 EP67 CP7 d7bs d7bm 4.822 7.200 0.222 0.018 0.425 0.018 0.340 0.483 7.222 7.160

[0154] Table 9-3

[0155] Figure 7A The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light of different wavelengths from the convergence focal point after passing through the lens. Figure 7B The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7C The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 7D The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 7A to 7D It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0156] Furthermore, in Examples 1 to 3, the effective focal length values ​​f1 to f8 of each lens, the effective focal length f of the optical imaging lens, the distance TTL from the object side of the first lens to the imaging surface of the optical imaging lens along the optical axis, and half of the maximum field of view (Semi-FOV) of the optical imaging lens are shown in Table 10.

[0157] Parameters / Examples 1 2 3 f1(mm) 6.09 6.61 6.82 f2 (mm) 14.51 16.39 16.27 f3 (mm) -11.62 -17.06 -23.08 f4 (mm) 9.01 7.93 10.25 f5 (mm) -11.31 -10.02 -12.41 f6 (mm) 8.14 8.89 9.13 f7 (mm) 14.62 16.92 31.97 f8(mm) -2.83 -2.80 -3.00 f(mm) 4.74 4.81 5.43 TTL(mm) 5.78 5.78 5.78 Semi-FOV (°) 46.3 45.8 44.5

[0158] Table 10

[0159] Examples 1 to 3 respectively satisfy the conditions shown in Table 11.

[0160]

[0161] Table 11

[0162] This application also provides an imaging device equipped with an electronic photosensitive element for imaging. The electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) device. The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0163] 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 protection 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 concept of this application. 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. Optical imaging lenses, including: The lens barrel and the lens assembly and at least seven spacer elements housed within the lens barrel are characterized in that, The lens group comprises lenses arranged sequentially along the optical axis from the object side to the image side: The first lens with positive optical power has a convex object side and a concave image side. A second lens with positive optical power has a convex object-side surface; The third lens with negative optical power has a concave image-side surface; The fourth lens with positive optical power has a concave object side and a convex image side. The fifth lens with negative optical power has a convex object side and a concave image side. The sixth lens with positive optical power has a concave object side and a convex image side. A seventh lens with positive optical power, its object-side surface is convex; and An eighth lens with negative optical power has a concave object-side surface and a convex image-side surface; and The optical imaging lens has eight lenses with optical power. The at least seven spacer elements include a j-th spacer element disposed on the image side of the j-th lens and in partial contact with the j-th lens, and a (j-1)-th spacer element disposed on the image side of the (j-1)-th lens and in partial contact with the (j-1)-th lens, wherein the optical imaging lens satisfies: 25.15≥EP(j-1) / CPj+T(j-1) / CTj>0.5, Wherein, Ep(j-1) is the distance between the (j-1)th spacer element and the jth spacer element along the optical axis, CPj is the maximum thickness of the jth spacer element, T(j-1) is the air gap between the (j-1)th lens and the jth lens on the optical axis, and CTj is the center thickness of the jth lens on the optical axis, where j is taken from 5, 6 or 7.

2. The optical imaging lens according to claim 1, characterized in that, The at least seven spacer elements include a first spacer element disposed on the image side of the first lens and in partial contact with the first lens. The radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the inner diameter d1s of the object side of the first spacer element, and the inner diameter d1m of the image side of the first spacer element satisfy the following: 3.59≥(R1+R2) / (R2-R1)×(d1s / d1m)≥2.

63.

3. The optical imaging lens according to claim 1, characterized in that, The at least seven spacer elements include an i-th spacer element disposed on the image side of the i-th lens and in partial contact with the i-th lens, wherein the optical imaging lens satisfies: -73.17≤Rim / CTi+Dis / dis≤70.87, Wherein, Rim is the radius of curvature of the image side of the i-th lens, CTi is the center thickness of the i-th lens on the optical axis, Dis is the outer diameter of the object side of the i-th spacer element, and dis is the inner diameter of the object side of the i-th spacer element, where i is taken from 1, 2, 3 or 4.

4. The optical imaging lens according to claim 1 or 2, characterized in that, satisfy: 1.91≤EP(j-1) / CPj+T(j-1) / CTj<20.

0.

5. The optical imaging lens according to claim 1 or 2, characterized in that, The at least seven spacer elements include those disposed between the seventh lens and the eighth lens: A seventh spacer element is placed on the image side of the seventh lens and in partial contact with the seventh lens, and an eighth spacer element is placed on the image side of the seventh spacer element.

6. The optical imaging lens according to claim 5, characterized in that, The radius of curvature R16 of the image-side surface of the eighth lens, the radius of curvature R15 of the object-side surface of the eighth lens, the effective focal length f8 of the eighth lens, the inner diameter d7bs of the object-side surface of the eighth spacer element, and the inner diameter d7bm of the image-side surface of the eighth spacer element satisfy the following: 71.28≥(R16-R15) / f8×(d7bs / d7bm)>15.

0.

7. The optical imaging lens according to claim 6, characterized in that, satisfy: 36.52≤(R16-R15) / f8×(d7bs / d7bm)≤71.

28.

8. The optical imaging lens according to claim 1 or 2, characterized in that, The outer diameter D6s of the object side of the spacer element placed on the image side of the sixth lens and in partial contact with the image side of the sixth lens, the inner diameter d6s of the object side of the spacer element placed on the image side of the sixth lens and in partial contact with the image side of the sixth lens, the spacing distance EP67 between the spacer element placed on the image side of the sixth lens and in partial contact with the image side of the sixth lens and the spacer element placed on the image side of the seventh lens and in partial contact with the image side of the seventh lens along the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy the following: 37.22≥(D6s+d6s) / EP67+T67 / CT6≥33.

68.

9. The optical imaging lens according to claim 2, characterized in that, The spacing distance EP12 between the first spacer element and the spacer element located on the image side of the second lens and partially in contact with the image side surface of the second lens along the optical axis, the maximum thickness CP1 of the first spacer element, the center thickness CT1 of the first lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following: 21.60≥EP12 / CP1+CT1 / T12≥18.

14.

10. The optical imaging lens according to claim 1 or 2, characterized in that, The air gap T56 between the fifth and sixth lenses on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, the spacing distance EP56 between the spacer element placed on the image side of the fifth lens and partially in contact with the image side surface of the fifth lens and the spacer element placed on the image side of the sixth lens and partially in contact with the image side surface of the sixth lens along the optical axis, the maximum thickness CP6 of the spacer element placed on the image side of the sixth lens and partially in contact with the image side surface of the sixth lens, and the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy the following: -31.85≤(T56+CT6) / (EP56+CP6)×(R11 / f6)≤-1.

95.

11. The optical imaging lens according to claim 1 or 2, characterized in that, The inner diameter d0m of the end face closest to the imaging side of the lens barrel, the outer diameter D0m of the end face closest to the imaging side of the lens barrel, the distance L from the end face closest to the subject to the end face closest to the imaging side of the lens barrel, the distance TD from the object side surface of the first lens to the image side surface of the eighth lens along the optical axis, and the effective focal length f of the optical imaging lens satisfy the following: 5.29≥(d0m+D0m) / L+TD / f≥4.

80.

12. The optical imaging lens according to claim 1 or 2, characterized in that, The at least seven spacer elements include flat-angle spacer elements or chamfered spacer elements, wherein the inner hole of the chamfered spacer element has a chamfer in the range of 45° to 60° on its object side or image side.

13. The optical imaging lens according to claim 1 or 2, characterized in that, The distance from the center of the effective diameter portion of the object side of the eighth lens to the rear end face of the lens barrel along the optical axis is less than the distance from the edge of the effective diameter portion of the object side of the eighth lens to the rear end face of the lens barrel along the optical axis.

14. The optical imaging lens according to claim 1, characterized in that, The at least seven spacer elements include a fifth spacer element disposed on the image side of the fifth lens and in partial contact with the fifth lens. The radius of curvature R9 of the object side of the fifth lens, the radius of curvature R10 of the image side of the fifth lens, the inner diameter d5s of the object side of the fifth spacer element, and the inner diameter d5m of the image side of the fifth spacer element satisfy the following: 3.43≥(R9×R10) / (d5s×d5m)≥1.79.

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