An optical imaging lens

Abstract

The present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with optical power; a second lens with optical power; a third lens with optical power; a fourth lens with optical power, whose image side surface is concave; a fifth lens with optical power, whose object side surface is concave and whose image side surface is convex; a sixth lens with optical power, whose image side surface is concave; a seventh lens with optical power; an eighth lens with optical power, whose object side surface is concave; wherein the axial distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging lens satisfy: TTL / f<1.05. The optical imaging lens provided by the present application can maintain clear imaging capabilities for distant objects while ensuring the miniaturization of the lens, and the blurring effect of the lens shooting can be significantly improved. In addition, it is ensured that there is enough imaging light entering the optical system during night shooting to reduce the noise of the imaging picture and obtain better imaging effects.

Description

Technical Field

[0001] The present application belongs to the field of optical imaging lenses, and in particular, relates to an optical imaging lens composed of eight lenses. Background Art

[0002] With the continuous development of mobile phone lenses, large image plane, telephoto and wide angle have become the standard configuration of major manufacturers, and the actual scene use of telephoto lenses has also received more and more attention. Limited by the characteristics of telephoto lenses, the FNO of most telephoto lenses on the market is around 2.0. The blur effect during portrait shooting is relatively general, and most of them are algorithm blur, which is not as natural as the lens.

[0003] Therefore, in order to solve the above problems, this application proposes a large-aperture telephoto lens, which ensures that the lens is miniaturized, and that the actual shooting process can not only maintain clear imaging capabilities for distant objects, but also significantly improve the blur effect of the lens shooting. In addition, it ensures that there is enough imaging light entering the optical system during night shooting, reduces the noise of the imaging picture, and obtains better imaging effects.

[0004] The foregoing description is intended to provide general background information and does not necessarily constitute prior art.

[0005] Application Contents

[0006] The present application aims to provide an optical imaging lens composed of eight lenses, which ensures that the lens is miniaturized, and that the actual shooting process can not only maintain clear imaging capabilities for distant objects, but also significantly improve the blur effect of the lens shooting. In addition, it ensures that sufficient imaging light can enter the optical system during night shooting, reduces the noise of the imaging picture, and obtains better imaging effects.

[0007] The present application provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis:

[0008] a first lens having optical power;

[0009] a second lens having optical power;

[0010] a third lens having optical power;

[0011] a fourth lens element having optical power and having a concave image-side surface;

[0012] a fifth lens having optical power, wherein the object side surface is concave and the image side surface is convex;

[0013] a sixth lens having optical power and having an image side surface which is concave;

[0014] a seventh lens having optical power;

[0015] an eighth lens having optical power and having a concave object side surface;

[0016] The axial distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging lens satisfy: TTL / f<1.05.

[0017] According to one embodiment of the present application, the distance SD from the aperture to the image side of the last lens and the axial distance TTL from the object side of the first lens to the imaging surface satisfy: 0.3 <SD / TTL<0.8。

[0018] According to one embodiment of the present application, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f of the optical imaging lens satisfy: -0.7<(f1+f2) / f<-0.1.

[0019] According to one embodiment of the present application, the effective focal length f of the optical imaging lens and the effective focal length f3 of the third lens satisfy: 0.6 <f / f3<1.4。

[0020] According to one embodiment of the present application, the maximum half field angle Semi-FOV of the optical imaging lens and the effective focal length f6 of the sixth lens satisfy: -5.0 <tan(Semi-FOV)×f6<-2.0。

[0021] According to one embodiment of the present application, the composite focal length f123 of the first, second and third lenses is equal to the effective focal length f8 of the eighth lens, satisfying: -1.0 <f123 / f8<-0.4。

[0022] According to one embodiment of the present application, the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.4 <R10 / R9<1.4。

[0023] According to one embodiment of the present application, the effective focal length f of the optical imaging lens, the curvature radius R7 of the object side of the fourth lens, and the curvature radius R5 of the object side of the third lens satisfy: 0.6 <f / R7-f / R5<1.4。

[0024] According to one embodiment of the present application, the effective half-aperture DT82 of the image side of the eighth lens and half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy: 0.5 <DT82 / ImgH<1.0。

[0025] According to one embodiment of the present application, the effective half-aperture DT61 of the sixth lens object side surface and the effective half-aperture DT11 of the first lens object side surface satisfy: 0.3 <DT61 / DT11<0.8。

[0026] According to one embodiment of the present application, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy: 0.5 <CT1 / (CT2+CT3)<1.2。

[0027] According to one embodiment of the present application, the air interval T78 between the seventh lens and the eighth lens on the optical axis and the air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.2 <T78 / T67<0.8。

[0028] According to one embodiment of the present application, the center thickness CT8 of the eighth lens on the optical axis and the edge thickness ET8 of the eighth lens satisfy: 0.4 <CT8 / ET8<1.0。

[0029] According to one embodiment of the present application, the on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis to the effective radius vertex of the image side surface of the eighth lens and the on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis to the effective radius vertex of the object side surface of the eighth lens satisfy: 0.5 <SAG82 / SAG81<1.2。

[0030] According to one embodiment of the present application, the on-axis distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis to the effective radius vertex of the object side surface of the seventh lens and the center thickness CT7 of the seventh lens on the optical axis satisfy: - 1.3 <SAG71 / CT7<-0.5。

[0031] According to one embodiment of the present application, the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the Abbe number V7 of the seventh lens satisfy: 0.3<(V5-V6) / (V6-V7)<0.9.

[0032] The present application also provides an optical imaging lens, which includes, in order from the object side to the image side along the optical axis:

[0033] a first lens having an optical focal length;

[0034] a second lens having an optical focal length;

[0035] a third lens having an optical focal length;

[0036] a fourth lens having an optical focal length, wherein the object side surface is convex and the image side surface is concave;

[0037] a fifth lens having an optical focal length, wherein the object side surface is concave and the image side surface is convex;

[0038] a sixth lens having an optical focal length and a concave image-side surface;

[0039] A seventh lens having an optical focal length, and an image side surface thereof being convex;

[0040] an eighth lens having an optical focal length;

[0041] The effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy:

[0042] f / EPD<1.7.

[0043] According to one embodiment of the present application, the distance SD from the aperture to the image side of the last lens and the axial distance TTL from the object side of the first lens to the imaging surface satisfy: 0.3 <SD / TTL<0.8。

[0044] According to one embodiment of the present application, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f of the optical imaging lens satisfy: -0.7<(f1+f2) / f<-0.1.

[0045] According to one embodiment of the present application, the effective focal length f of the optical imaging lens and the effective focal length f3 of the third lens satisfy: 0.6 <f / f3<1.4。

[0046] According to one embodiment of the present application, the maximum half field angle Semi-FOV of the optical imaging lens and the effective focal length f6 of the sixth lens satisfy: -5.0 <tan(Semi-FOV)×f6<-2.0。

[0047] According to one embodiment of the present application, the composite focal length f123 of the first, second and third lenses is equal to the effective focal length f8 of the eighth lens, satisfying: -1.0 <f123 / f8<-0.4。

[0048] According to one embodiment of the present application, the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.4 <R10 / R9<1.4。

[0049] According to one embodiment of the present application, the effective focal length f of the optical imaging lens, the curvature radius R7 of the object side of the fourth lens, and the curvature radius R5 of the object side of the third lens satisfy: 0.6 <f / R7-f / R5<1.4。

[0050] According to one embodiment of the present application, the effective half-aperture DT82 of the image side of the eighth lens and half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy: 0.5 <DT82 / ImgH<1.0。

[0051] According to one embodiment of the present application, the effective half-aperture DT61 of the sixth lens object side surface and the effective half-aperture DT11 of the first lens object side surface satisfy: 0.3 <DT61 / DT11<0.8。

[0052] According to one embodiment of the present application, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy: 0.5 <CT1 / (CT2+CT3)<1.2。

[0053] According to one embodiment of the present application, the air interval T78 between the seventh lens and the eighth lens on the optical axis and the air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.2 <T78 / T67<0.8。

[0054] According to one embodiment of the present application, the center thickness CT8 of the eighth lens on the optical axis and the edge thickness ET8 of the eighth lens satisfy: 0.4 <CT8 / ET8<1.0。

[0055] According to one embodiment of the present application, the on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis to the effective radius vertex of the image side surface of the eighth lens and the on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis to the effective radius vertex of the object side surface of the eighth lens satisfy: 0.5 <SAG82 / SAG81<1.2。

[0056] According to one embodiment of the present application, the on-axis distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis to the effective radius vertex of the object side surface of the seventh lens and the center thickness CT7 of the seventh lens on the optical axis satisfy: - 1.3 <SAG71 / CT7<-0.5。

[0057] According to one embodiment of the present application, the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the Abbe number V7 of the seventh lens satisfy: 0.3<(V5-V6) / (V6-V7)<0.9.

[0058] Beneficial effects of this application:

[0059] The optical imaging lens provided in the present application includes multiple lenses, such as the first lens to the seventh lens. By controlling the lens TTL and F focal length ratio, on the one hand, the total length of the lens is not too long, the camera module is light and thin, and the appearance and feel of the mobile phone are guaranteed; on the other hand, the focal length is as long as possible to meet the magnification ratio of the telephoto lens and achieve the telephoto magnification effect of shooting. The FNO of the telephoto lens is controlled to be below 1.7. On the one hand, the depth of field is small, and a good blur effect can be directly obtained during the portrait shooting process; on the other hand, it is ensured that there is sufficient light flux and the image plane has a high illumination, so as to maintain excellent imaging quality in night shooting or in an environment with weak light energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0061] Figure 1 This is a schematic diagram of the lens group structure of Embodiment 1 of the optical imaging lens of the present application;

[0062] Figure 2a to Figure 2d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 1 of the present application;

[0063] Figure 3 This is a schematic diagram of the lens group structure of Embodiment 2 of the optical imaging lens of the present application;

[0064] Figures 4a to 4d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 2 of the present application;

[0065] Figure 5 This is a schematic diagram of the lens group structure of Embodiment 3 of the optical imaging lens of the present application;

[0066] Figures 6a to 6d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of Example 3 of the optical imaging lens of the present application;

[0067] Figure 7 This is a schematic diagram of the lens group structure of Embodiment 4 of the optical imaging lens of the present application;

[0068] Figures 8a to 8dThey are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 4 of the present application;

[0069] Fig. 9 This is a schematic diagram of the lens group structure of Embodiment 5 of the optical imaging lens of the present application;

[0070] Figures 10a to 10d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 5 of the present application;

[0071] Fig.11 This is a schematic diagram of the lens group structure of Example 6 of the optical imaging lens of the present application;

[0072] Figures 12a to 12d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 6 of the present application;

[0073] Fig.13 This is a schematic diagram of the lens assembly structure of Embodiment 7 of the optical imaging lens of the present application;

[0074] Figures 14a to 14d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging lens embodiment 7 of the present application. DETAILED DESCRIPTION

[0075] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0076] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0077] It should also be understood that the terms "comprises", "including", "having", "includes" 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0078] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0079] In the description of this application, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens.

[0080] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0081] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The features, principles and other aspects of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0082] Exemplary Embodiments

[0083] The exemplary optical imaging lens of the present application includes eight lenses, which include: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in order from the object side to the image side along the optical axis. In fact, each lens is independent of each other, and there is an air gap between each lens on the optical axis.

[0084] In this exemplary embodiment, a first lens having optical power; a second lens having optical power; a third lens having optical power; a fourth lens having optical power, whose image side surface is concave; a fifth lens having optical power, whose object side surface is concave and whose image side surface is convex; a sixth lens having optical power, whose image side surface is concave; a seventh lens having optical power; and an eighth lens having optical power, whose object side surface is concave.

[0085] Among them, the axial distance TTL from the object side of the first lens to the imaging surface and the effective focal length f of the optical imaging lens satisfy: TTL / f<1.05. By controlling the lens TTL and F focal length ratio, on the one hand, the total length of the lens is not too long, the thinness of the camera module, and the appearance and feel of the mobile phone are guaranteed; on the other hand, the focal length is as long as possible to meet the magnification ratio of the telephoto lens and achieve the telephoto magnification effect of shooting. More specifically, the axial distance TTL from the object side of the first lens to the imaging surface and the effective focal length f of the optical imaging lens satisfy: 0.98≤TTL / f≤1.00.

[0086] In this exemplary embodiment, a first lens having optical power; a second lens having optical power; a third lens having optical power; a fourth lens having optical power, whose object side surface is convex and whose image side surface is concave; a fifth lens having optical power, whose object side surface is concave and whose image side surface is convex; a sixth lens having optical power, whose image side surface is concave; a seventh lens having optical power, whose image side surface is convex; and an eighth lens having optical power.

[0087] Among them, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD<1.7. The FNO of the telephoto lens is controlled below 1.7. On the one hand, the depth of field is small, and a good blur effect can be directly obtained during portrait shooting; on the other hand, sufficient light flux is ensured, and the image plane has a high illumination, so as to maintain excellent imaging quality in night shooting or in environments with weak light energy. More specifically, the effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: 1.57≤f / EPD≤1.59.

[0088] In an exemplary embodiment of the present application, the distance SD from the aperture stop to the image side surface of the last lens and the on-axis distance TTL from the object side surface of the first lens to the imaging surface satisfy: 0.3 < SD / TTL < 0.8. Controlling the distance of the aperture stop in the entire optical system is beneficial in reducing the aperture of the front lens on one hand, avoiding various risks during the molding and assembly processes caused by an overly large lens aperture; on the other hand, it can better correct aberrations, coma, chromatic aberration, etc. of the system, improving the imaging quality of the entire optical system. More specifically, the distance SD from the aperture stop to the image side surface of the last lens and the on-axis distance TTL from the object side surface of the first lens to the imaging surface satisfy: 0.52 ≤ SD / TTL ≤ 0.57.

[0089] In an exemplary embodiment of the present application, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f of the optical imaging lens satisfy: -0.7 < (f1 + f2) / f < -0.1. Controlling the reasonable proportion of the first lens and the second lens in the entire focal length is not only beneficial for controlling the convergence of light rays to obtain a larger aperture, but also the combination of the first and second lenses is beneficial for correcting spherical aberration and coma, avoiding the sacrifice of image quality caused by excessive coma and spherical aberration with marginal apertures. More specifically, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f of the optical imaging lens satisfy: -0.52 ≤ (f1 + f2) / f < -0.31.

[0090] In an exemplary embodiment of the application, the effective focal length f of the optical imaging lens and the effective focal length f3 of the third lens satisfy: 0.6 < f / f3 < 1.4. Controlling the ratio of the focal length of the third lens in the lens focal length reasonably converges the light rays in front on one hand, which is beneficial for the miniaturization of the system; on the other hand, it effectively avoids the problem of the sensitivity of this lens caused by overly concentrated optical power, and the tolerance requirements are more in line with the existing process capability level. More specifically, the effective focal length f of the optical imaging lens and the effective focal length f3 of the third lens satisfy: 0.83 ≤ f / f3 ≤ 1.05.

[0091] In an exemplary embodiment of the present application, the maximum semi-field of view Semi-FOV of the optical imaging lens and the effective focal length f6 of the sixth lens satisfy: -5.0 < tan(Semi-FOV) × f6 < -2.0. By reasonably controlling the product of the tangent value of the semi-field of view of the lens imaging and the focal length of the sixth lens, on the one hand, it ensures the field of view of the lens and guarantees that enough pictures can be obtained during shooting; on the other hand, the sixth lens reasonably distributes the negative focal length to ensure that the optical system has a sufficiently large image plane and the corresponding field of view while being miniaturized. More specifically, the maximum semi-field of view Semi-FOV of the optical imaging lens and the effective focal length f6 of the sixth lens satisfy: -4.58 ≤ tan(Semi-FOV) × f6 ≤ -2.61.

[0092] In an exemplary embodiment of the present application, the combined focal length f123 of the first, second, and third lenses and the effective focal length f8 of the eighth lens satisfy: -1.0 < f123 / f8 < -0.4. By reasonably distributing the ratio of the first three lenses and the eighth lens, on the one hand, it better balances the aberration of the entire system and improves the imaging quality of the system; on the other hand, it reasonably controls the light path, avoids the problem of excessive sensitivity of the lens caused by too steep light, and is also beneficial to the miniaturization of the system. More specifically, the combined focal length f123 of the first, second, and third lenses and the effective focal length f8 of the eighth lens satisfy: -0.75 ≤ f123 / f8 ≤ -0.63.

[0093] In an exemplary embodiment of the present application, the radius of curvature R10 of the image side of the fifth lens and the radius of curvature R9 of the object side of the fifth lens satisfy: 0.4 < R10 / R9 < 1.4. By reasonably controlling the radius of curvature of the image side and the object side of the fifth lens, on the one hand, it is beneficial to the balance of coma and astigmatism of the optical system; on the other hand, it is beneficial to reduce the aperture of the front lens and avoid instability in assembly and molding caused by too large an aperture. More specifically, the radius of curvature R10 of the image side of the fifth lens and the radius of curvature R9 of the object side of the fifth lens satisfy: 0.64 ≤ R10 / R9 ≤ 1.13.

[0094] In an exemplary embodiment of the present application, the effective focal length f of the optical imaging lens, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R5 of the object side surface of the third lens satisfy: 0.6 < f / R7 - f / R5 < 1.4. By reasonably controlling the difference in the ratio of the curvature of the object side surface of the third lens, the curvature of the object side surface of the fourth lens, and the focal length of the lens, on the one hand, it is avoided that the R value is too large, resulting in serious bending of the lens, so that the lens sensitivity is too high and the processing difficulty is relatively large; on the other hand, the R values of the third and fourth lenses and the focal length are reasonably allocated, which has a good balancing effect on the spherical aberration of the optical system. More specifically, the effective focal length f of the optical imaging lens, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R5 of the object side surface of the third lens satisfy: 0.91 ≤ f / R7 - f / R5 ≤ 1.2.

[0095] In an exemplary embodiment of the present application, the effective semi-aperture DT82 of the image side surface of the eighth lens and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: 0.5 < DT82 / ImgH < 1.0. By reasonably controlling the ratio of the image side surface of the eighth lens to the imaging surface, the aperture of the eighth lens is restricted, the size of the rear-end structure of the lens is reduced, which is beneficial to the miniaturization of the system; the second CRA angle is controlled to better match the chip. More specifically, the effective semi-aperture DT82 of the image side surface of the eighth lens and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: 0.75 ≤ DT82 / ImgH ≤ 0.83.

[0096] In an exemplary embodiment of the present application, the effective semi-aperture DT61 of the object side surface of the sixth lens and the effective semi-aperture DT11 of the object side surface of the first lens satisfy: 0.3 < DT61 / DT11 < 0.8. By reasonably controlling the effective semi-apertures of the object side surface of the sixth lens and the object side surface of the first lens, on the one hand, the range of incident light is reasonably restricted, the light with poor edge quality is eliminated, the off-axis aberration is reduced, and the resolution of the imaging lens is effectively improved; on the other hand, it is avoided that the difference in the aperture of the lenses is too large, which will cause the problem of large step difference between the lenses and is not conducive to the stability of lens assembly. More specifically, the effective semi-aperture DT61 of the object side surface of the sixth lens and the effective semi-aperture DT11 of the object side surface of the first lens satisfy: 0.55 ≤ DT61 / DT11 ≤ 0.62.

[0097] In an exemplary embodiment of the present application, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 0.5 < CT1 / (CT2 + CT3) < 1.2. By reasonably controlling the ratio of the central thickness of the first lens to the sum of the central thicknesses of the second and third lenses, on the one hand, the processability of the lens is ensured, avoiding problems such as easy deformation during assembly due to being too thin or poor molding stress of the too thick lens. On the other hand, the thickness distribution can effectively balance the field curvature of the optical system and improve the image quality. More specifically, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 0.77 ≤ CT1 / (CT2 + CT3) ≤ 0.97.

[0098] In an exemplary embodiment of the present application, the air gap T78 between the seventh lens and the eighth lens on the optical axis and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.2 < T78 / T67 < 0.8. By restricting the ratio of the air gaps between the seventh and eighth lenses to the air gaps between the sixth and seventh lenses, the gap amount between the lenses is guaranteed, avoiding collision problems between the lenses during tests such as assembly or dropping. At the same time, it is beneficial to slow down the light deflection, and the field curvature of the lens can be adjusted to reduce the sensitivity, thereby obtaining better imaging quality. More specifically, the air gap T78 between the seventh lens and the eighth lens on the optical axis and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.43 ≤ T78 / T67 ≤ 0.65.

[0099] In an exemplary embodiment of the present application, the central thickness CT8 of the eighth lens on the optical axis and the edge thickness ET8 of the eighth lens satisfy: 0.4 < CT8 / ET8 < 1.0. By reasonably restricting the central thickness and the edge thickness of the eighth lens, it is ensured that the last lens is not easily deformed during the assembly process, which is very helpful for the stability of the field curvature, and the molding debugging process space is larger. It avoids the risk of stray light caused by appearance problems of the eighth lens, and at the same time, it can better balance the distortion and astigmatism of the entire system. More specifically, the central thickness CT8 of the eighth lens on the optical axis and the edge thickness ET8 of the eighth lens satisfy: 0.64 ≤ CT8 / ET8 ≤ 0.76.

[0100] In an exemplary embodiment of the present application, the axial distance SAG82 between the intersection point of the image side surface of the eighth lens and the optical axis and the vertex of the effective radius of the image side surface of the eighth lens, and the axial distance SAG81 between the intersection point of the object side surface of the eighth lens and the optical axis and the vertex of the effective radius of the object side surface of the eighth lens satisfy: 0.5 < SAG82 / SAG81 < 1.2. Reasonably restricting the sag heights of the image side surface and the object side surface of the eighth lens is beneficial to the debugging of the molding process on the one hand, avoiding abnormal demolding during mold molding, etc., which may cause surface distortion and affect the actual imaging quality; on the other hand, it ensures the stability of lens assembly and improves the yield of actual products. More specifically, the axial distance SAG82 between the intersection point of the image side surface of the eighth lens and the optical axis and the vertex of the effective radius of the image side surface of the eighth lens, and the axial distance SAG81 between the intersection point of the object side surface of the eighth lens and the optical axis and the vertex of the effective radius of the object side surface of the eighth lens satisfy: 0.77 ≤ SAG82 / SAG81 ≤ 0.94.

[0101] In an exemplary embodiment of the present application, the axial distance SAG71 between the intersection point of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, and the central thickness CT7 of the seventh lens on the optical axis satisfy: -1.3 < SAG71 / CT7 < -0.5. Reasonably controlling the ratio of the sag height of the object side surface of the seventh lens to the thickness of the seventh lens ensures the molding and assembly processes of the seventh lens, avoids problems such as appearance during molding, which may lead to stray light risks, and large deformations during assembly, which may cause system field curvature and MTF fluctuations. In addition, it converges the light rays in front, which is beneficial to smoother light ray transition and reduces the sensitivity of the system. More specifically, the axial distance SAG71 between the intersection point of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, and the central thickness CT7 of the seventh lens on the optical axis satisfy: -1.09 ≤ SAG71 / CT7 ≤ -0.71.

[0102] In an exemplary embodiment of the present application, the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the Abbe number V7 of the seventh lens satisfy: 0.3 < (V5 - V6) / (V6 - V7) < 0.9. Reasonably allocating the Abbe numbers of the fifth, sixth, and seventh lenses is beneficial to the chromatic aberration correction of the entire optical system, avoiding obvious color fringing problems during actual shooting. In addition, through reasonable material selection, a better balance is achieved between cost and performance. More specifically, the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the Abbe number V7 of the seventh lens satisfy: (V5 - V6) / (V6 - V7) = 0.56.

[0103] In this exemplary embodiment, the object side surface and the image side surface of any lens of the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0104]

[0105] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspheric surface.

[0106] In this exemplary embodiment, the optical imaging lens may further include a stop. The stop may be disposed at an appropriate position as required, for example, the stop may be disposed between the object side and the first lens. Optionally, the optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0107] The optical imaging lens according to the above embodiment of the present application may use multiple lenses, such as the above eight lenses. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the optical imaging lens has a larger imaging surface, a wide imaging range, and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0108] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side of the first lens to the image side of the seventh lens is an aspherical mirror surface. The characteristics of the aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical mirror surface. Optionally, the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all aspherical mirror surfaces.

[0109] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are used as an example in the embodiments, the optical imaging lens is not limited to including eight lenses, and the optical imaging lens may also include other numbers of lenses if necessary.

[0110] Specific embodiments of the optical imaging lens applicable to the above embodiments are further described below with reference to the accompanying drawings. Specific embodiment 1

[0112] Figure 1 Schematic diagram of the lens group structure of the optical imaging lens embodiment 1 of the present application. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0113] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is concave. The eighth lens E8 has negative focal power, and its object side surface S15 is concave, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through each of the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0114] As shown in Table 1, it is a basic parameter table of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0115]

[0116]

[0117] Table 1

[0118] As shown in Table 2, in Example 1, the total effective focal length of the optical imaging lens is f=8.49 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens is 8.49 mm, and half of the diagonal length of the effective pixel area on the imaging surface S19 is ImgH=3.52 mm.

[0119]

[0120] Table 2

[0121] The optical imaging lens in Example 1 satisfies:

[0122] TTL / f=1.00, where TTL is the axial distance from the object side of the first lens to the imaging surface, and f is the effective focal length of the optical imaging lens.

[0123] SD / TTL=0.57, where SD is the distance from the aperture to the image side of the last lens, and TTL is the axial distance from the object side of the first lens to the imaging plane.

[0124] (f1+f2) / f=-0.42, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f is the effective focal length of the optical imaging lens.

[0125] f / f3=1.00, wherein f is the effective focal length of the optical imaging lens, and f3 is the effective focal length of the third lens.

[0126] tan(Semi-FOV)×f6=-3.55, wherein Semi-FOV is the maximum half field of view angle of the optical imaging lens, and f6 is the effective focal length of the sixth lens.

[0127] f123 / f8=-0.68, wherein f123 is the combined focal length of the first, second and third lenses, and f8 is the effective focal length of the eighth lens.

[0128] R10 / R9=0.79, wherein R10 is the radius of curvature of the image side surface of the fifth lens, and R9 is the radius of curvature of the object side surface of the fifth lens.

[0129] f / R7-f / R5=1.07, wherein f is the effective focal length of the optical imaging lens, R7 is the radius of curvature of the object side of the fourth lens, and R5 is the radius of curvature of the object side of the third lens.

[0130] DT82 / ImgH=0.83, wherein DT82 is the effective semi-aperture of the image side of the eighth lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0131] DT61 / DT11=0.62, wherein DT61 is the effective semi-diameter of the object side of the sixth lens, and DT11 is the effective semi-diameter of the object side of the first lens.

[0132] CT1 / (CT2+CT3)=0.84, wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

[0133] T78 / T67=0.52, wherein T78 is the air space between the seventh lens and the eighth lens on the optical axis, and T67 is the air space between the sixth lens and the seventh lens on the optical axis.

[0134] CT8 / ET8=0.64, wherein CT8 is the center thickness of the eighth lens on the optical axis, and ET8 is the edge thickness of the eighth lens.

[0135] SAG82 / SAG81=0.77, wherein SAG82 is the on-axis distance between the intersection of the image side surface of the eighth lens and the optical axis to the vertex of the effective radius of the image side surface of the eighth lens, and SAG81 is the on-axis distance between the intersection of the object side surface of the eighth lens and the optical axis to the vertex of the effective radius of the object side surface of the eighth lens.

[0136] SAG71 / CT7=-0.71, wherein SAG71 is the on-axis distance between the intersection of the object side surface of the seventh lens and the optical axis to the vertex of the effective radius of the object side surface of the seventh lens, and CT7 is the center thickness of the seventh lens on the optical axis.

[0137] (V5-V6) / (V6-V7)=0.56, wherein V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, and V7 is the Abbe number of the seventh lens.

[0138] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 3 shows high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface S1-S16 in Example 1.

[0139]

[0140]

[0141] Table 3

[0142] Figure 2aThe axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 2b The astigmatism curve of the optical imaging lens of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 2c The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2d The magnification chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 2a to Figure 2d It can be seen from the figure that the optical imaging lens provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0144] Figure 3 Schematic diagram of the lens group structure of the optical imaging lens embodiment 2 of the present application. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0145] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is convex. The eighth lens E8 has negative focal power, and its object side surface S15 is concave, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through each of the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0146] As shown in Table 4, it is a basic parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0147]

[0148] Table 4

[0149] As shown in Table 5, in Example 2, the total effective focal length of the optical imaging lens is f=8.50 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens is 8.50 mm, and half of the diagonal length of the effective pixel area on the imaging surface S19 is ImgH=3.52 mm.

[0150]

[0151] Table 5

[0152] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface S1-S16 in Example 1.

[0153]

[0154]

[0155] Table 6

[0156] Figure 4a The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4b The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 4c The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4d The magnification chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4a to 4d It can be seen from the figure that the optical imaging lens provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0158] Figure 5 Schematic diagram of the lens group structure of the optical imaging lens embodiment 3 of the present application. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0159] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has positive focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has negative focal power, and its object side surface S15 is concave, and its image side surface S16 is convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through each of the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0160] As shown in Table 7, it is a basic parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0161]

[0162]

[0163] Table 7

[0164] As shown in Table 8, in Example 3, the total effective focal length of the optical imaging lens is f=8.51 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens is 8.51 mm, and half of the diagonal length of the effective pixel area on the imaging surface S19 is ImgH=3.50 mm.

[0165]

[0166] Table 8

[0167] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 9 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface S1-S16 in Example 1.

[0168]

[0169]

[0170] Table 9

[0171] Figure 6aThe axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6b The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6c The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6d The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 6a to 6d It can be seen from the figure that the optical imaging lens provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0173] Figure 7 Schematic diagram of the lens group structure of the optical imaging lens embodiment 4 of the present application. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0174] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has negative focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has positive focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has negative focal power, and its object side surface S15 is concave, and its image side surface S16 is convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through each of the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0175] As shown in Table 10, it is a basic parameter table of the optical imaging lens of Example 4, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0176]

[0177] Table 10

[0178] As shown in Table 11, in Example 4, the total effective focal length of the optical imaging lens is f=8.52 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens is 8.52 mm, and half of the diagonal length of the effective pixel area on the imaging surface S19 is ImgH=3.52 mm.

[0179]

[0180]

[0181] Table 11

[0182] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 12 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface S1-S16 in Example 1.

[0183] Face number A4 A6 A8 A10 A12 S1 -2.1363E-03 -6.3553E-04 3.6268E-04 -1.6177E-04 6.2315E-05 S2 2.4525E-03 9.1297E-03 -3.8114E-03 5.0190E-04 9.3816E-05 S3 -2.8623E-02 3.0444E-02 -1.5703E-02 4.4956E-03 -7.5436E-04 S4 -4.7309E-02 5.4247E-02 -3.3354E-02 1.1665E-02 -2.7498E-03 S5 -6.0127E-03 3.0747E-02 -1.8462E-02 5.5858E-03 -9.1360E-04 S6 -6.8586E-03 2.7896E-03 6.1242E-03 -4.7341E-03 1.6674E-03 S7 -6.0456E-02 -1.5597E-02 3.3827E-02 -1.4406E-02 1.4856E-03 S8 -7.8907E-02 -3.1375E-02 8.1992E-02 -6.4908E-02 2.8551E-02 S9 7.5954E-02 1.1865E-02 -1.5448E-02 -1.7220E-02 2.4570E-02 S10 1.3015E-01 2.0275E-02 -1.3996E-01 1.9104E-01 -1.7162E-01 S11 -1.3665E-02 2.6728E-02 -1.0525E-01 1.7310E-01 -1.6016E-01 S12 -8.0928E-02 1.7925E-01 -4.1538E-01 6.6652E-01 -6.8741E-01 S13 -1.5387E-02 -2.3715E-02 4.5690E-02 -6.0586E-02 5.1078E-02 S14 -2.0148E-02 1.3255E-02 -3.8522E-02 6.3210E-02 -6.6697E-02 S15 -8.6537E-02 6.4929E-02 -4.0013E-02 2.4424E-02 -1.2934E-02 S16 -9.1438E-02 6.0860E-02 -3.3018E-02 1.3856E-02 -3.0647E-03 Face number A14 A16 A18 A20 S1 -1.8294E-05 3.4989E-06 -4.1280E-07 2.7297E-08 S2 -4.7124E-05 8.1859E-06 -7.7124E-07 4.0331E-08 S3 7.6031E-05 -4.6278E-06 1.6967E-07 -3.3405E-09 S4 5.5594E-04 -1.0443E-04 1.4633E-05 -1.1913E-06 S5 1.0480E-04 -1.6261E-05 2.2970E-06 -1.3247E-07 S6 -3.5378E-04 4.7510E-05 -3.7645E-06 1.3315E-07 S7 6.7112E-04 -2.4082E-04 2.9523E-05 -1.2511E-06 S8 -7.5608E-03 1.1867E-03 -1.0061E-04 3.5029E-06 S9 -1.2678E-02 3.4057E-03 -4.7455E-04 2.7089E-05 S10 1.0561E-01 -4.1066E-02 8.9191E-03 -8.1887E-04 S11 9.2416E-02 -3.3115E-02 6.7246E-03 -5.8953E-04 S12 4.5254E-01 -1.8392E-01 4.1989E-02 -4.1119E-03 S13 -2.8201E-02 1.0041E-02 -2.2033E-03 2.6718E-04 S14 4.6904E-02 -2.2519E-02 7.4134E-03 -1.6476E-03 S15 5.1495E-03 -1.4371E-03 2.6832E-04 -3.1368E-05 S16 -7.4254E-04 9.4324E-04 -4.0788E-04 1.0697E-04

[0184] Table 12

[0185] Figure 8a The axial chromatic aberration curve of the optical imaging lens of Example 4 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 8b The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 8c The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8d The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 8a to 8d It can be seen from the figure that the optical imaging lens provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0187] Fig. 9 Schematic diagram of the lens group structure of the optical imaging lens embodiment 5 of the present application. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0188] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has positive focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has negative focal power, and its object side surface S15 is concave, and its image side surface S16 is convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through each of the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0189] As shown in Table 13, it is a basic parameter table of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0190]

[0191]

[0192] Table 13

[0193] As shown in Table 14, in Example 5, the total effective focal length of the optical imaging lens is f=8.54 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens is 8.54 mm, and half of the diagonal length of the effective pixel area on the imaging surface S19 is ImgH=3.51 mm.

[0194]

[0195] Table 14

[0196] In Example 5, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 15 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspherical mirror surfaces S1-S16 that can be used in Example 1.

[0197]

[0198]

[0199] Table 15

[0200] Fig.10aThe axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig.10b The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.10c The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.10d The magnification chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 10a to 10d It can be seen from the figure that the optical imaging lens provided in Example 5 can achieve good imaging quality. Specific embodiment 6

[0202] Fig.11 Schematic diagram of the lens group structure of the optical imaging lens embodiment 6 of the present application. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0203] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has positive focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has negative focal power, and its object side surface S15 is concave, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through each of the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0204] As shown in Table 16, it is a basic parameter table of the optical imaging lens of Example 6, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0205]

[0206] Table 16

[0207] As shown in Table 17, in Example 6, the total effective focal length of the optical imaging lens is f=8.55 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens is 8.44 mm, and half of the diagonal length of the effective pixel area on the imaging surface S19 is ImgH=3.45 mm.

[0208]

[0209] Table 17

[0210] In Example 6, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 18 shows high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface S1-S16 in Example 1.

[0211] Face number A4 A6 A8 A10 A12 S1 -2.1825E-03 -3.3611E-04 -8.5209E-06 2.8378E-05 -2.5937E-06 S2 -7.2887E-03 1.7098E-02 -8.4093E-03 2.2497E-03 -3.4109E-04 S3 -1.9380E-02 3.6688E-02 -2.1337E-02 6.1698E-03 -9.5685E-04 S4 -6.0990E-02 1.0004E-01 -6.4615E-02 2.1180E-02 -3.7096E-03 S5 -4.9506E-02 8.1902E-02 -5.2060E-02 1.7811E-02 -3.3405E-03 S6 -7.0437E-02 3.5673E-02 -5.5690E-04 -4.4650E-03 1.4769E-03 S7 -6.5625E-02 -8.7415E-02 1.2800E-01 -6.8719E-02 1.8534E-02 S8 -4.6722E-02 -3.8685E-02 4.9382E-02 -2.5011E-02 6.5622E-03 S9 1.3501E-02 2.2742E-01 -2.8816E-01 1.6774E-01 -5.1947E-02 S10 1.4602E-01 7.5365E-02 -1.8244E-01 1.2258E-01 -3.9447E-02 S11 5.0934E-02 -9.7178E-02 7.1538E-02 -3.5128E-02 1.2723E-02 S12 -6.8354E-02 4.0431E-02 -3.0027E-02 1.9283E-02 -6.7234E-03 S13 -6.4179E-03 -2.0436E-02 1.9118E-02 -1.2207E-02 4.2640E-03 S14 -7.4321E-03 -1.1379E-02 8.1269E-03 -3.9229E-03 1.0110E-03 S15 -9.4073E-02 4.3056E-02 -9.2032E-03 4.1777E-04 1.6318E-04 S16 -1.0098E-01 4.5203E-02 -1.2789E-02 2.4015E-03 -3.7634E-04 Face number A14 A16 A18 A20 S1 -1.2745E-06 3.2327E-07 -3.6061E-08 2.2047E-09 S2 2.6990E-05 -8.3264E-07 -3.1549E-09 0.0000E+00 S3 7.5429E-05 -2.2274E-06 -1.6143E-08 0.0000E+00 S4 3.2573E-04 -1.1289E-05 2.0218E-07 -2.5908E-08 S5 3.2911E-04 -1.6844E-05 9.5608E-07 -7.0643E-08 S6 -1.9649E-04 9.6741E-06 5.1003E-10 0.0000E+00 S7 -2.4647E-03 1.1923E-04 1.3940E-06 5.4400E-08 S8 -8.5411E-04 3.8545E-05 7.9016E-07 0.0000E+00 S9 8.2211E-03 -5.0658E-04 -3.5131E-06 0.0000E+00 S10 6.1202E-03 -3.4387E-04 -4.7235E-06 0.0000E+00 S11 -2.8628E-03 2.6095E-04 2.5580E-06 0.0000E+00 S12 1.0032E-03 -2.6874E-05 -9.0561E-07 0.0000E+00 S13 -7.8957E-04 6.2218E-05 -2.0988E-06 3.8133E-07 S14 -1.5030E-04 1.8786E-05 -3.8560E-06 6.8697E-07 S15 -2.1629E-05 -8.1459E-07 4.7767E-07 -9.3967E-08 S16 9.0745E-05 -3.3595E-05 1.0627E-05 -2.4431E-06

[0212] Table 18

[0213] Fig.12a The axial chromatic aberration curve of the optical imaging lens of Example 6 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 12b The astigmatism curve of the optical imaging lens of Example 6 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.12c The distortion curve of the optical imaging lens of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.12d The magnification chromatic aberration curve of the optical imaging lens of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 12a to 12d It can be seen from the figure that the optical imaging lens provided in Example 6 can achieve good imaging quality. Specific embodiment 7

[0215] Fig.13 Schematic diagram of the lens group structure of the optical imaging lens embodiment 7 of the present application. The optical imaging lens includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0216] The first lens E1 has positive focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has positive focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has negative focal power, and its object side surface S15 is concave, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through each of the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0217] As shown in Table 19, it is a basic parameter table of the optical imaging lens of Example 7, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0218]

[0219] Table 19

[0220] As shown in Table 20, in Example 7, the total effective focal length of the optical imaging lens is f=8.57 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens is 8.42 mm, and half of the diagonal length of the effective pixel area on the imaging surface S19 is ImgH=3.60 mm.

[0221]

[0222] Table 20

[0223] In Example 7, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 21 shows high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspherical mirror surfaces S1-S16 that can be used in Example 1.

[0224]

[0225]

[0226] Table 21

[0227] Fig.14aThe axial chromatic aberration curve of the optical imaging lens of Example 7 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig.14b The astigmatism curve of the optical imaging lens of Example 7 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.14c The distortion curve of the optical imaging lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.14d The magnification chromatic aberration curve of the optical imaging lens of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 14a to 14d It can be seen from the figure that the optical imaging lens provided in Example 7 can achieve good imaging quality.

[0228] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An optical imaging lens, characterized in that: The optical imaging lens has eight lenses with optical power, and the optical imaging lens includes, in order from the object side to the image side along the optical axis: A first lens having positive optical power, whose object side surface is convex; The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave; The third lens has positive power and its object side surface is convex; a fourth lens element having negative optical power, whose object side surface is convex and whose image side surface is concave; A fifth lens having negative optical power, whose object side surface is concave and image side surface is convex; a sixth lens having negative optical power, whose object side surface is convex and whose image side surface is concave; a seventh lens having positive refractive power; an eighth lens having negative optical power, whose object side surface is concave; The axial distance TTL from the object side of the first lens to the imaging surface and the effective focal length f of the optical imaging lens satisfy: 0.98≤TTL / f<1.05; The curvature radius R10 of the image side surface of the fifth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.64≤R10 / R9≤1.

13.

2. The optical imaging lens according to claim 1, wherein: The distance SD from the aperture to the image side of the last lens and the axial distance TTL from the object side of the first lens to the imaging plane satisfy: 0.52≤SD / TTL≤0.

57.

3. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f of the optical imaging lens satisfy: -0.52≤(f1+f2) / f≤-0.

31.

4. The optical imaging lens according to claim 1, wherein: The effective focal length f of the optical imaging lens and the effective focal length f3 of the third lens satisfy: 0.83≤f / f3≤1.

09.

5. The optical imaging lens according to claim 1, wherein: The maximum half field angle Semi-FOV of the optical imaging lens and the effective focal length f6 of the sixth lens satisfy: -4.58≤tan(Semi-FOV)×f6≤-2.

61.

6. The optical imaging lens according to claim 1, wherein: The combined focal length f123 of the first, second and third lenses and the effective focal length f8 of the eighth lens satisfy: -0.75≤f123 / f8≤-0.

63.

7. The optical imaging lens according to claim 1, wherein: The effective focal length f of the optical imaging lens, the curvature radius R7 of the object side of the fourth lens, and the curvature radius R5 of the object side of the third lens satisfy: 0.84≤f / R7-f / R5≤1.

2.

8. The optical imaging lens according to claim 1, wherein: The effective half-aperture DT82 of the image-side surface of the eighth lens and half the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: 0.75≤DT82 / ImgH≤0.

83.

9. The optical imaging lens according to claim 1, wherein: The effective half-aperture DT61 of the object side surface of the sixth lens and the effective half-aperture DT11 of the object side surface of the first lens satisfy: 0.55≤DT61 / DT11≤0.

62.

10. The optical imaging lens according to claim 1, wherein: The center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis satisfy: 0.77≤CT1 / (CT2+CT3)≤0.

97.

11. The optical imaging lens according to claim 1, wherein: An air interval T78 between the seventh lens and the eighth lens on the optical axis and an air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.43≤T78 / T67≤0.

65.

12. The optical imaging lens according to claim 1, wherein: A center thickness CT8 of the eighth lens on the optical axis and an edge thickness ET8 of the eighth lens satisfy: 0.64≤CT8 / ET8≤0.

76.

13. The optical imaging lens according to claim 1, wherein: The on-axis distance SAG82 between the intersection of the image side surface of the eighth lens and the optical axis to the effective radius vertex of the image side surface of the eighth lens and the on-axis distance SAG81 between the intersection of the object side surface of the eighth lens and the optical axis to the effective radius vertex of the object side surface of the eighth lens satisfy: 0.77≤SAG82 / SAG81≤0.

94.

14. The optical imaging lens according to claim 1, wherein: An axial distance SAG71 between the intersection of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy: -1.09≤SAG71 / CT7≤-0.

71.

15. The optical imaging lens according to claim 1, wherein: The Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the Abbe number V7 of the seventh lens satisfy: (V5-V6) / (V6-V7)=0.56.

Images