CN216622818U

CN216622818U - Optical imaging lens

Info

Publication number: CN216622818U
Application number: CN202122806434.9U
Authority: CN
Inventors: 唐梦娜; 吕赛锋; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2022-05-27
Anticipated expiration: 2031-11-16

Abstract

The present application provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a refractive power; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power, an object side surface of which has a convex shape, and an image side surface of which has a concave shape; a fifth lens having a refractive power, an object side surface of which has a concave shape, and an image side surface of which has a convex shape; a sixth lens having a refractive power whose image side surface has a concave shape; a seventh lens having a refractive power whose image side surface has a convex shape; an eighth lens having a refractive power; wherein, 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 application provides an optical imaging lens can keep clear imaging ability to the object of distance, and the blurring effect of camera lens shooting can obtain obviously promoting. In addition, enough imaging light rays can be ensured in night shooting, noise of imaging pictures is reduced, and a better imaging effect is obtained.

Description

Optical imaging lens

Technical Field

The application belongs to the field of optical imaging lenses, and particularly relates to an optical imaging lens consisting of eight lenses.

Background

With the continuous development of the current mobile phone lens, the large image plane, the telephoto and the wide angle become standard configurations of various manufacturers, and the more importance is paid to the use of the actual scene of the telephoto lens. On one hand, due to the characteristics of the telephoto lens, most of the FNO of the telephoto lens in the market is about 2.0, so that the total length of the lens is overlong, and the appearance and the hand feeling of the mobile phone are poor when the FNO is installed on the mobile phone; on the other hand, the blurring effect in the portrait shooting process is relatively general, most of the blurring effect is still algorithm blurring, and the effect is not as natural as the lens.

Therefore, for above-mentioned problem, this application provides a big aperture telephoto lens, guarantees on the miniaturized basis of camera lens, and the actual shooting process not only can keep clear imaging ability to the object in a distance, and the blurring effect of camera lens shooting can obtain obviously promoting moreover. In addition, enough imaging light rays can enter the optical system in night shooting, noise of imaging pictures is reduced, and a better imaging effect is obtained.

The foregoing description is provided for general background information and is not admitted to be prior art

SUMMERY OF THE UTILITY MODEL

This application aims at providing an optical imaging lens who comprises eight lenses, guarantees on the miniaturized basis of camera lens, and the actual shooting process not only can keep clear imaging ability to the object in a distance, and the blurring effect of camera lens shooting can obtain obviously promoting moreover. In addition, enough imaging light rays can enter the optical system in night shooting, noise of imaging pictures is reduced, and a better imaging effect is obtained.

The present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising:

a first lens having a refractive power;

a second lens having a refractive power;

a third lens having a refractive power;

a fourth lens having a refractive power, an object side surface of which has a convex shape, and an image side surface of which has a concave shape;

a fifth lens having a refractive power, an object side surface of which has a concave shape, and an image side surface of which has a convex shape;

a sixth lens having a refractive power whose image side surface has a concave shape;

a seventh lens having a refractive power whose image side surface has a convex shape;

an eighth lens having a refractive power;

wherein, 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。

according to one embodiment of the present application, a distance SD from a stop to an image side surface of a last lens and an on-axis distance TTL from an object side surface of the first lens to an image plane satisfy: 0.3< SD/TTL < 0.8.

According to one embodiment of the 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.

According to one 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.

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). times.f 6< -2.0.

According to an embodiment of the present application, a combined focal length f123 of the first, second, and third lenses is equal to an effective focal length f8 of the eighth lens, and satisfies: -1.0< f123/f8< -0.4.

According to one embodiment of the present application, the radius of curvature R10 of the image-side surface of the fifth lens element and the radius of curvature R9 of the object-side surface of the fifth lens element satisfy: 0.4< R10/R9< 1.4.

According to one embodiment of the 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.

According to one embodiment of the present application, the effective half aperture DT82 of the image side surface of the eighth lens element and the half ImgH of the diagonal length of the effective pixel area on the image plane satisfy: 0.5< DT82/ImgH < 1.0.

According to one embodiment of the present application, 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: 0.3< DT61/DT11< 0.8.

According to an embodiment of the present application, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.5< CT1/(CT2+ CT3) < 1.2.

According to an embodiment of the present application, an air interval T78 of the seventh and eighth lenses on the optical axis and an air interval T67 of the sixth and seventh lenses on the optical axis satisfy: 0.2< T78/T67< 0.8.

According to an embodiment of the present application, a center thickness CT8 of the eighth lens on an optical axis and an edge thickness ET8 of the eighth lens satisfy: 0.4< CT8/ET8< 1.0.

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

According to one embodiment of the present application, an on-axis distance SAG71 between an intersection point of the seventh lens object-side surface and the optical axis to an effective radius vertex of the seventh lens object-side surface and a central thickness CT7 of the seventh lens on the optical axis satisfy: -1.3 < SAG71/CT7< -0.5.

According to an 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.

The beneficial effect of this application:

the optical imaging lens provided by the application comprises a plurality of lenses, such as a first lens to a seventh lens. The ratio of TTL to F focal length of the lens is controlled, on one hand, the total lens length is not too long, the camera module is light and thin, and the appearance and the hand feeling of the mobile phone are ensured; on the other hand, the focal length is as long as possible, the magnification ratio of the telephoto lens is met, and the long-focus photographing magnification effect is achieved. The FNO of the telephoto lens is controlled to be below 1.7, so that on one hand, the depth of field is small, and a good blurring effect can be directly obtained in the portrait shooting process; on the other hand, enough luminous flux is ensured, the image plane has higher illumination, and excellent imaging quality is maintained in night shooting or an environment with weak light energy.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a lens assembly according to an embodiment 1 of the present application;

fig. 2a to 2d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to an embodiment 1 of the present application;

FIG. 3 is a schematic diagram illustrating a lens assembly according to embodiment 2 of the present application;

fig. 4a to 4d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to an embodiment 2 of the present application;

FIG. 5 is a schematic diagram illustrating a lens assembly according to embodiment 3 of the present application;

fig. 6a to 6d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to an embodiment 3 of the present application;

FIG. 7 is a schematic diagram illustrating a lens assembly according to embodiment 4 of the present application;

fig. 8a to 8d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to an embodiment 4 of the present application;

FIG. 9 is a schematic diagram illustrating a lens assembly structure of an optical imaging lens system according to embodiment 5 of the present application;

fig. 10a to 10d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an optical imaging lens according to an embodiment 5 of the present application;

FIG. 11 is a schematic diagram of a lens assembly according to embodiment 6 of the present application;

fig. 12a to 12d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of an optical imaging lens according to an embodiment 6 of the present application;

FIG. 13 is a schematic diagram illustrating a lens assembly according to example 7 of an optical imaging lens system of the present application;

fig. 14a to 14d are an axial chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, in an optical imaging lens according to example 7 of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

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

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

In the description of the present application, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position 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 concave position 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 surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. Features, principles and other aspects of the present application will be described in detail below with reference to the drawings and in conjunction with embodiments.

Exemplary embodiments

An exemplary optical imaging lens of the present application includes eight lenses, and includes, in order from an object side to an image side along an optical axis: the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein the lenses are independent from each other, and an air space is formed between the lenses on an optical axis.

In the present exemplary embodiment, a first lens having a refractive power; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power, an image side surface of which has a concave shape; a fifth lens having a refractive power, an object side surface of which has a concave shape, and an image side surface of which has a convex shape; a sixth lens having a refractive power whose image side surface has a concave shape; a seventh lens having refractive power; an eighth lens having a refractive power whose object side surface has a concave shape.

Wherein, the on-axis 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 meet the following requirements: TTL/f < 1.05. The ratio of TTL to F focal length of the lens is controlled, on one hand, the total lens length is not too long, the camera module is light and thin, and the appearance and the hand feeling of the mobile phone are ensured; on the other hand, the focal length is as long as possible, the magnification ratio of the telephoto lens is met, and the long-focus photographing magnification effect is achieved. More specifically, the on-axis distance TTL from the object-side surface of the first lens element to the imaging surface and the effective focal length f of the optical imaging lens satisfy: TTL/f is more than or equal to 0.98 and less than or equal to 1.00.

In the present exemplary embodiment, a first lens having a refractive power; a second lens having a refractive power; a third lens having a refractive power; a fourth lens having a refractive power, an object side surface of which has a convex shape, and an image side surface of which has a concave shape; a fifth lens having a refractive power, an object side surface of which has a concave shape, and an image side surface of which has a convex shape; a sixth lens having a refractive power, an image side surface of which has a concave shape; a seventh lens having a refractive power whose image side surface has a convex shape; an eighth lens having a refractive power.

Wherein, 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 to be below 1.7, so that on one hand, the depth of field is small, and a good blurring effect can be directly obtained in the portrait shooting process; on the other hand, enough luminous flux is ensured, the image plane has higher illumination, and excellent imaging quality is maintained in night shooting or an environment 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: f/EPD is more than or equal to 1.57 and less than or equal to 1.59.

In the exemplary embodiment of the present application, a distance SD from the stop to the image side surface of the last lens and an on-axis distance TTL from the object side surface of the first lens to the image plane satisfy: 0.3< SD/TTL < 0.8. The distance of the diaphragm in the whole optical system is controlled, so that the aperture of the front lens is reduced, and various risks in the forming and assembling processes caused by overlarge aperture of the lens are avoided; on the other hand, distortion, coma aberration, chromatic aberration and the like of the system can be better corrected, and the imaging quality of the whole optical system is improved. More specifically, the distance SD from the diaphragm 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 image-side surface satisfy: SD/TTL is more than or equal to 0.52 and less than or equal to 0.57.

In the 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. The first lens and the second lens are distributed reasonably under the control of the ratio of the whole focal length, so that the convergence of light rays is controlled, a larger aperture is obtained, the first lens and the second lens are matched to correct spherical aberration and coma aberration, and the image quality loss caused by the fact that the coma aberration and the edge aperture have overlarge spherical aberration is avoided. 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.

In the application exemplary embodiment, 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. The ratio of the focal length of the third lens of the lens is reasonably distributed, on one hand, the light in front is further converged, the miniaturization of the system is facilitated, on the other hand, the problem of the sensitivity of the lens caused by the over concentration of the refractive power is effectively avoided, and the tolerance requirement is 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: f/f3 is more than or equal to 0.83 and less than or equal to 1.05.

In the exemplary 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). times.f 6< -2.0. The product of the tangent value of the half field angle imaged by the lens and the focal length of the sixth lens is controlled reasonably, so that the field angle of the lens is ensured, and enough pictures can be obtained during shooting; on the other hand, the sixth lens reasonably distributes the negative focal length, so that the optical system is ensured to have a sufficiently large image plane and a corresponding field angle while being miniaturized. More specifically, 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. ltoreq. tan (Semi-FOV). times.f 6. ltoreq.2.61.

In the exemplary embodiment of the present application, the combined focal length f123 of the first, second, and third lenses is equal to the effective focal length f8 of the eighth lens, and satisfies: -1.0< f123/f8< -0.4. The ratio of the first three lenses to the eighth lens is controlled and reasonably distributed, so that on one hand, the aberration of the whole system is better balanced, and the imaging quality of the system is improved; in addition, on one hand, the light trend is reasonably controlled, the problem that the sensitivity of the lens is too high due to too steep light is avoided, and in addition, the system miniaturization is facilitated. More specifically, the combined focal length f123 of the first, second and third lenses is equal to the effective focal length f8 of the eighth lens, and satisfies the following conditions: f123/f8 is more than or equal to-0.75 and less than or equal to-0.63.

In an exemplary embodiment of the present application, a radius of curvature R10 of the image-side surface of the fifth lens and a radius of curvature R9 of the object-side surface of the fifth lens satisfy: 0.4< R10/R9< 1.4. Curvature radiuses of the image side surface and the object side surface of the fifth lens are reasonably controlled, so that balance of coma aberration and astigmatism of an optical system is facilitated; on the other hand, the aperture of the front lens is reduced, and the instability of assembly and forming caused by overlarge aperture is avoided. More specifically, the radius of curvature R10 of the image-side surface of the fifth lens element and the radius of curvature R9 of the object-side surface of the fifth lens element satisfy: R10/R9 is more than or equal to 0.64 and less than or equal to 1.13.

In the exemplary embodiment of the present application, the effective focal length f of the optical imaging lens, the radius of curvature R7 of the object-side surface of the fourth lens, and the radius of curvature R5 of the object-side surface of the third lens satisfy: 0.6< f/R7-f/R5< 1.4. The difference between the curvature of the object side surface of the third lens and the curvature of the object side surface of the fourth lens and the focal length ratio of the lens is reasonably controlled, so that the problem that the lens is seriously bent due to overlarge R value is avoided, the sensitivity of the lens is overhigh, and the processing difficulty is higher; on the other hand, the R values and the focal lengths of the third lens and the fourth lens are reasonably distributed, and the spherical aberration of the optical system is well balanced. More specifically, the effective focal length f of the optical imaging lens, the radius of curvature R7 of the object-side surface of the fourth lens, and the radius of curvature R5 of the object-side surface of the third lens satisfy: f/R7-f/R5 is more than or equal to 0.91 and less than or equal to 1.2.

In the exemplary embodiment of the present application, the effective half aperture DT82 of the image side surface of the eighth lens element and the half ImgH of the diagonal length of the effective pixel area on the image plane satisfy: 0.5< DT82/ImgH < 1.0. The ratio of the image side surface to the image surface of the eighth lens is reasonably controlled, the caliber of the eighth lens is limited, the structural size of the rear end of the lens is reduced, and the miniaturization of a system is facilitated; and the second CRA angle control is better matched with the chip. More specifically, the effective half aperture DT82 of the image side surface of the eighth lens element and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: DT82/ImgH is more than or equal to 0.75 and less than or equal to 0.83.

In the exemplary embodiment of the present application, 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: 0.3< DT61/DT11< 0.8. Through reasonable control of effective half apertures of the object side surface of the sixth lens and the object side surface of the first lens, on one hand, the range of incident light rays is reasonably limited, light rays with poor edge quality are eliminated, off-axis aberration is reduced, and the resolving power of the imaging lens is effectively improved; in addition, the problem of large section difference between lenses due to overlarge caliber difference of the lenses is avoided, and the stability of lens assembly is not facilitated. More specifically, 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: DT61/DT11 of more than or equal to 0.55 and less than or equal to 0.62.

In the exemplary embodiment of the present application, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.5< CT1/(CT2+ CT3) < 1.2. The proportion of the sum of the central thicknesses of the first lens, the third lens and the third lens is reasonably controlled, on one hand, the manufacturability of the lens is ensured, the problems that the assembly is easy to deform due to over-thinness or the molding stress of an over-thick lens is poor and the like are avoided, on the other hand, the field curvature of the optical system can be effectively balanced through thickness distribution, and the image quality is improved. 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: 0.77-0.26 percent of CT1/(CT2+ CT3) -0.97 percent of the total weight of the composition.

In the exemplary embodiment of the present application, an air interval T78 of the seventh and eighth lenses on the optical axis and an air interval T67 of the sixth and seventh lenses on the optical axis satisfy: 0.2< T78/T67< 0.8. Through restricting seventh lens, eighth lens air gap and sixth lens, seventh lens air gap ratio, guarantee clearance volume between the lens, avoid equipment or fall etc. experiment lead to appearing the collision problem between the lens, be favorable to slowing down light deflection simultaneously to the field curvature of camera lens can be adjusted, the sensitivity is reduced, and then obtains better imaging quality. More specifically, an air interval T78 of the seventh lens and the eighth lens on the optical axis and an air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: T78/T67 of 0.43 is less than or equal to 0.65.

In the exemplary embodiment of the present application, a center thickness CT8 of the eighth lens on the optical axis and an edge thickness ET8 of the eighth lens satisfy: 0.4< CT8/ET8< 1.0. The thickness and the marginal thickness in the eighth lens of reasonable restriction guarantee that last lens assembling process is difficult to warp, have very big help to the stability of field curvature to the shaping debugging process space is bigger, avoids eighth lens appearance problem to appear and leads to the parasitic light risk, and distortion and astigmatism that also can better balanced entire system simultaneously. More specifically, the central thickness CT8 of the eighth lens on the optical axis and the edge thickness ET8 of the eighth lens satisfy: CT8/ET8 is more than or equal to 0.64 and less than or equal to 0.76.

In the exemplary embodiment of the present application, an on-axis distance SAG82 between an intersection point of the eighth lens image-side surface and the optical axis and an effective radius vertex of the eighth lens image-side surface and an on-axis distance SAG81 between an intersection point of the eighth lens object-side surface and the optical axis and an effective radius vertex of the eighth lens object-side surface satisfy: 0.5< SAG82/SAG81< 1.2. The rise of the image side surface and the object side surface of the eighth lens is reasonably limited, so that the debugging of a forming process is facilitated, and the influence of surface type distortion on the actual imaging quality caused by abnormal demoulding and the like in the mould forming is avoided; in addition, the assembling stability of the lens is ensured, and the actual product yield is improved. More specifically, an on-axis distance SAG82 between an intersection point of the eighth lens image-side surface and the optical axis and an effective radius vertex of the eighth lens image-side surface and an on-axis distance SAG81 between an intersection point of the eighth lens object-side surface and the optical axis and an effective radius vertex of the eighth lens object-side surface satisfy: 0.77 is less than or equal to SAG82/SAG81 is less than or equal to 0.94.

In an exemplary embodiment of the present application, an on-axis distance SAG71 between an intersection point of the seventh lens object-side surface and the optical axis to an effective radius vertex of the seventh lens object-side surface and a center thickness CT7 of the seventh lens on the optical axis satisfy: -1.3 < SAG71/CT7< -0.5. The object side rise and the thickness ratio of the seventh lens are reasonably controlled, the forming and assembling process of the seventh lens is ensured, the field curvature and MTF fluctuation of the system caused by stray light risk and large assembling deformation due to appearance and other problems in forming are avoided, in addition, the front light is converged, the smooth transition of the light is facilitated, and the sensitivity of the system is reduced. More specifically, an on-axis distance SAG71 between an intersection point of the seventh lens object-side surface and the optical axis and an effective radius vertex of the seventh lens object-side surface and a central thickness CT7 of the seventh lens on the optical axis satisfy: -1.09 is more than or equal to SAG71/CT7 is more than or equal to-0.71.

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. The abbe numbers of the fifth lens, the sixth lens and the seventh lens are reasonably distributed, so that chromatic aberration correction of the whole optical system is facilitated, the problem of bright color development edge in the actual shooting process is avoided, and in addition, reasonable material selection is realized, and the cost and the performance are well balanced. 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.

In the present exemplary embodiment, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 are aspheric, and the profile x of each aspheric lens can be defined using, but not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.

In the present exemplary embodiment, the above-described optical imaging lens may further include a diaphragm. The stop may be disposed at an appropriate position as needed, 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 on the imaging surface.

The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above-described eight lenses. The optical imaging lens has the characteristics of large imaging image surface, wide imaging range and high imaging quality by reasonably distributing the refractive power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, and the ultrathin property of the mobile phone is ensured.

In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspheric mirror surface. Optionally, each of 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 has an object-side surface and an image-side surface which are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although eight lenses are exemplified in the embodiment, the optical imaging lens is not limited to include eight lenses, and may include other numbers of lenses if necessary.

Specific embodiments of an optical imaging lens suitable for the above-described embodiments are further described below with reference to the drawings.

Detailed description of the preferred embodiment 1

Fig. 1 is a schematic view of a lens assembly according to embodiment 1 of the present disclosure, in which the optical imaging lens includes, in order from an object side to an image side along an optical axis: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop 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 image plane S19.

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

As shown in table 1, a basic parameter table of the optical imaging lens of embodiment 1 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

TABLE 1

As shown in table 2, in embodiment 1, the total effective focal length f of the optical imaging lens is 8.50mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S19 is 8.50mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S19 is 3.52 mm.

TABLE 2

In example 1, the object-side surface and the image-side surface of any one of the first lens element E1 through the eighth lens element E8 are aspheric, and table 6 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S16 in example 1.

Flour mark	A4	A6	A8	A10	A12
						S1	-1.7954E-03	-4.2557E-04	-1.1452E-04	2.4737E-04	-1.3481E-04
S2	8.1194E-03	3.1563E-03	1.5205E-04	-1.3440E-03	6.7240E-04
						S3	-3.0474E-02	2.9253E-02	-1.2144E-02	1.5976E-03	4.2898E-04
S4	-5.3269E-02	5.3800E-02	-3.2879E-02	1.6551E-02	-8.2491E-03
						S5	8.4287E-05	1.4618E-02	-4.1992E-03	7.9560E-04	-1.0430E-03
S6	-2.6978E-03	-2.3936E-02	4.0296E-02	-2.6808E-02	1.0205E-02
						S7	-4.0850E-02	-9.6930E-02	1.4569E-01	-9.8129E-02	4.0044E-02
S8	-7.9057E-02	1.2432E-02	-1.0316E-03	8.7155E-03	-8.3590E-03
						S9	6.5113E-02	9.5861E-02	-1.7884E-01	1.4982E-01	-7.7880E-02
S10	1.4414E-01	5.3901E-03	-1.3606E-01	1.7819E-01	-1.3036E-01
						S11	3.1160E-02	-9.4375E-02	9.4602E-02	-4.5600E-02	5.2428E-03
S12	-4.3970E-02	2.2612E-02	-3.2673E-02	6.5190E-02	-6.8601E-02
						S13	-1.4743E-02	-3.3365E-03	1.8158E-03	-1.7880E-03	9.3315E-04
S14	-1.7500E-02	6.0908E-03	-1.1871E-02	1.1400E-02	-7.1881E-03
						S15	-6.0174E-02	-3.0296E-02	1.0984E-01	-1.3565E-01	1.0250E-01
S16	-6.4954E-02	-2.0010E-02	7.6072E-02	-8.5420E-02	5.9422E-02
						Flour mark	A14	A16	A18	A20
S1	3.9526E-05	-6.9174E-06	7.0801E-07	-3.8656E-08
						S2	-1.6011E-04	2.0683E-05	-1.3920E-06	3.8224E-08
S3	-1.9604E-04	3.1116E-05	-2.3345E-06	6.9177E-08
						S4	3.1989E-03	-7.9560E-04	1.1734E-04	-9.3603E-06
S5	6.5120E-04	-1.7412E-04	2.1581E-05	-1.0277E-06
						S6	-2.4169E-03	3.5231E-04	-2.8863E-05	1.0118E-06
S7	-1.0558E-02	1.7676E-03	-1.7072E-04	7.2133E-06
						S8	3.3818E-03	-7.0259E-04	7.4364E-05	-3.2333E-06
S9	2.6309E-02	-5.6171E-03	6.8842E-04	-3.6877E-05
						S10	5.9295E-02	-1.6393E-02	2.5054E-03	-1.6201E-04
S11	5.7137E-03	-3.0981E-03	6.2974E-04	-4.7128E-05
						S12	4.0793E-02	-1.3980E-02	2.5715E-03	-1.9568E-04
S13	-3.5160E-04	9.4497E-05	-1.6913E-05	1.4255E-06
						S14	2.9713E-03	-8.0655E-04	1.4058E-04	-1.4859E-05
S15	-5.1697E-02	1.7900E-02	-4.2706E-03	6.8993E-04
						S16	-2.8488E-02	9.8018E-03	-2.4643E-03	4.5439E-04

TABLE 3

Fig. 2a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2c shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 2a to 2d, the optical imaging lens according to embodiment 1 can achieve good imaging quality.

Specific example 2

Fig. 3 is a schematic view of a lens assembly according to embodiment 2 of the present application, in order from an object side to an image side along an optical axis: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop 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 image plane S19.

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

As shown in table 4, the basic parameter table of the optical imaging lens of embodiment 2 is shown, in which the units of the curvature radius, the thickness, and the focal length are all millimeters (mm).

TABLE 4

As shown in table 5, in embodiment 2, the total effective focal length f of the optical imaging lens is 8.51mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S19 is 8.51mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S19 is 3.50 mm.

TABLE 5

In example 2, the object-side surface and the image-side surface of any one of the first lens element E1 to the eighth lens element E8 are both aspheric, and table 6 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S16 in example 1.

TABLE 6

Fig. 4a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4c shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 4a to 4d, the optical imaging lens according to embodiment 2 can achieve good imaging quality.

Specific example 3

Fig. 5 is a lens assembly structure of an optical imaging lens system according to embodiment 3 of the present application, which, in order from an object side to an image side along an optical axis, includes: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop 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 image plane S19.

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

As shown in table 7, the basic parameter table of the optical imaging lens of embodiment 3 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

TABLE 7

As shown in table 8, in embodiment 3, the total effective focal length f of the optical imaging lens is 8.52mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S19 is 8.52mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S19 is 3.52 mm.

TABLE 8

In example 3, the object-side surface and the image-side surface of any one of the first lens element E1 through the eighth lens element E8 are aspheric, and table 9 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S16 in example 1.

Flour mark	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
						Flour mark	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

TABLE 9

Fig. 6a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6c shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 6a to 6d, the optical imaging lens according to embodiment 3 can achieve good imaging quality.

Specific example 4

Fig. 7 is a lens assembly structure of an optical imaging lens system according to embodiment 4 of the present application, which, in order from an object side to an image side along an optical axis, includes: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop 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 image plane S19.

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

As shown in table 10, the basic parameter table of the optical imaging lens of embodiment 4 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Watch 10

As shown in table 11, in embodiment 4, the total effective focal length f of the optical imaging lens is 8.53mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S19 is 8.53mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S19 is 3.52 mm.

TABLE 11

In example 4, the object-side surface and the image-side surface of any one of the first lens element E1 through the eighth lens element E8 are aspheric, and table 12 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S16 in example 1.

TABLE 12

Fig. 8a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8c shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 8a to 8d, the optical imaging lens according to embodiment 4 can achieve good imaging quality.

Specific example 5

Fig. 9 is a schematic view of a lens assembly in accordance with embodiment 5 of the present optical imaging lens assembly, in order from an object side to an image side along an optical axis: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop 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 image plane S19.

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

As shown in table 13, the basic parameter table of the optical imaging lens of example 5 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

Watch 13

As shown in table 14, in embodiment 5, the total effective focal length f of the optical imaging lens is 8.54mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S19 is 8.54mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S19 is 3.51 mm.

TABLE 14

In example 5, the object-side surface and the image-side surface of any one of the first lens element E1 through the eighth lens element E8 are aspheric, and table 15 shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S16 in example 1.

Flour mark	A4	A6	A8	A10	A12
						S1	-1.7045E-03	-4.9122E-04	-1.2691E-05	1.6757E-04	-9.6508E-05
S2	7.0444E-03	4.4984E-03	-9.0268E-04	-8.6269E-04	5.3458E-04
						S3	-3.1538E-02	3.1506E-02	-1.4190E-02	2.6120E-03	1.2200E-04
S4	-5.4467E-02	5.7437E-02	-3.6768E-02	1.8623E-02	-8.7909E-03
						S5	-5.7812E-04	1.7462E-02	-7.8085E-03	3.1476E-03	-1.9291E-03
S6	-2.3724E-03	-2.5463E-02	4.2754E-02	-2.8960E-02	1.1306E-02
						S7	-4.0004E-02	-9.6235E-02	1.4674E-01	-1.0172E-01	4.3150E-02
S8	-8.1829E-02	2.3762E-02	-2.5650E-02	3.6933E-02	-2.6748E-02
						S9	6.3934E-02	1.0477E-01	-2.0412E-01	1.8191E-01	-9.9968E-02
S10	1.4594E-01	2.4003E-03	-1.3448E-01	1.7841E-01	-1.3134E-01
						S11	3.1713E-02	-9.7280E-02	1.0291E-01	-5.7039E-02	1.3939E-02
S12	-4.2309E-02	2.0011E-02	-2.3520E-02	5.1387E-02	-5.7864E-02
						S13	-1.1686E-02	-1.5227E-02	2.4147E-02	-2.8554E-02	2.0973E-02
S14	-1.3375E-02	-2.5415E-04	-3.4982E-03	5.0935E-03	-4.5964E-03
						S15	-7.5469E-02	1.1154E-02	5.0648E-02	-7.3870E-02	5.7175E-02
S16	-8.2203E-02	1.8726E-02	3.3633E-02	-5.4606E-02	4.4642E-02
						Flour mark	A14	A16	A18	A20
S1	2.7991E-05	-4.7358E-06	4.5760E-07	-2.2775E-08
						S2	-1.3450E-04	1.7671E-05	-1.1889E-06	3.2291E-08
S3	-1.3745E-04	2.4218E-05	-1.8783E-06	5.6258E-08
						S4	3.2337E-03	-7.7853E-04	1.1261E-04	-8.8718E-06
S5	8.5099E-04	-2.0066E-04	2.3495E-05	-1.0853E-06
						S6	-2.7529E-03	4.1236E-04	-3.4659E-05	1.2448E-06
S7	-1.1873E-02	2.0706E-03	-2.0724E-04	9.0215E-06
						S8	1.0446E-02	-2.2852E-03	2.6539E-04	-1.2821E-05
S9	3.5148E-02	-7.6725E-03	9.4587E-04	-5.0292E-05
						S10	6.0052E-02	-1.6662E-02	2.5479E-03	-1.6408E-04
S11	1.8285E-03	-2.0785E-03	4.8210E-04	-3.7778E-05
						S12	3.6043E-02	-1.2807E-02	2.4276E-03	-1.8930E-04
S13	-9.7949E-03	2.8092E-03	-4.5291E-04	3.1590E-05
						S14	2.5907E-03	-9.3760E-04	2.1473E-04	-2.9492E-05
S15	-2.8637E-02	9.7530E-03	-2.2818E-03	3.6131E-04
						S16	-2.4159E-02	9.2653E-03	-2.5811E-03	5.2495E-04

Watch 15

Fig. 10a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10c shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 10a to 10d, the optical imaging lens according to embodiment 5 can achieve good imaging quality.

Specific example 6

Fig. 11 is a lens assembly structure of the optical imaging lens system of embodiment 7 of the present application, in order from an object side to an image side along an optical axis: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop 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 image plane S19.

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

As shown in table 16, the basic parameter table of the optical imaging lens of example 6 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).

TABLE 16

As shown in table 17, in example 6, the total effective focal length f of the optical imaging lens is 8.55mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S19 is 8.44mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S19 is 3.45 mm.

TABLE 17

In example 6, the object-side surface and the image-side surface of any one of the first lens element E1 to the eighth lens element E8 are aspheric, and table 18 shows high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S16 in example 1.

Watch 18

Fig. 12a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12b shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 6. Fig. 12c shows a distortion curve of the optical imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 6, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. As can be seen from fig. 12a to 12d, the optical imaging lens according to embodiment 6 can achieve good imaging quality.

Specific example 7

Fig. 13 is a lens assembly according to embodiment 7 of the present application, in order from an object side to an image side along an optical axis, the optical imaging lens includes: the image sensor includes a first lens E1, a second lens E2, a third lens E3, a stop 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 image plane S19.

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

As shown in table 19, the basic parameter tables of the optical imaging lens of example 7 are shown, in which the units of the radius of curvature, the thickness, and the focal length are millimeters (mm).

Watch 19

As shown in table 20, in example 7, the total effective focal length f of the optical imaging lens is 8.57mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens imaging surface S19 is 8.42mm, and the half ImgH of the diagonal length of the effective pixel region on the imaging surface S19 is 3.60 mm.

Watch 20

In example 7, the object-side surface and the image-side surface of any one of the first lens element E1 to the eighth lens element E8 are aspheric, and table 21 shows high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the respective aspheric mirror surfaces S1 to S16 in example 1.

TABLE 21

Fig. 14a shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 7, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 14b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 7. Fig. 14c shows a distortion curve of the optical imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14d shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 7, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. As can be seen from fig. 14a to 14d, the optical imaging lens according to embodiment 7 can achieve good imaging quality.

The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, improvements, equivalents, etc. that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical imaging lens, comprising, in order from an object side to an image side along an optical axis:

a first lens having a refractive power;

a second lens having a refractive power;

a third lens having a refractive power;

a fourth lens having a refractive power, an object side of which is convex in shape, and an image side of which is concave in shape;

an eighth lens having a refractive power;

wherein, 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.

2. The optical imaging lens of claim 1, wherein the distance SD from the 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 image plane satisfy: 0.3< SD/TTL < 0.8.

3. The optical imaging lens of 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: -0.7< (f1+ f2)/f < -0.1.

4. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens and the effective focal length f3 of the third lens satisfy: 0.6< f/f3< 1.4.

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: -5.0< tan (Semi-FOV). times.f 6< -2.0.

6. The optical imaging lens of claim 1, wherein the combined focal length f123 of the first, second and third lenses is equal to the effective focal length f8 of the eighth lens, and satisfies the following conditions: -1.0< f123/f8< -0.4.

7. The optical imaging lens of claim 1, wherein the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R9 of the object-side surface of the fifth lens satisfy: 0.4< R10/R9< 1.4.

8. The optical imaging lens of claim 1, wherein the effective focal length f of the optical imaging lens, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R5 of the object-side surface of the third lens satisfy: 0.6< f/R7-f/R5< 1.4.

9. The optical imaging lens of claim 1, wherein the effective half aperture DT82 of the image side surface of the eighth lens element and the half ImgH of the diagonal length of the effective pixel area on the imaging surface satisfy: 0.5< DT82/ImgH < 1.0.

10. The optical imaging lens of claim 1, wherein 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.