Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a convex surface; a second lens with positive optical power, wherein the object side surface of the second lens is a convex surface; a third lens with positive optical power; a fourth lens with negative optical power; a fifth lens with positive optical power, wherein the object side surface of the fifth lens is a convex surface; a sixth lens with positive optical power, wherein the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; and a seventh lens with negative optical power, wherein the object side surface and the image side surface of the seventh lens are both concave surfaces; wherein the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: -0.91<(R1-R2) / (R1+R2)<-0.07. The optical lens provided by the application has one or more advantages of long focal length, large aperture, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND

[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are increasingly used in intelligent driving, and vehicle optical lenses are continuously improving in the automotive industry.

[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving, which collects environmental information through various lenses combined with sensors to ensure the safety of drivers. In addition to the requirements of optical lenses for the existing ADAS system, such as light and thin shape, high pixel, high resolution and other characteristics, the optical lens is also required to clearly image under low illumination conditions, so it is necessary to develop an optical lens with good imaging effect. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with excellent imaging quality.

[0005] The technical scheme adopted by the present application is:

[0006] An optical lens, a total of seven lenses, including in order along the optical axis from the object side to the imaging surface:

[0007] The first lens with negative focal power, the object side surface is concave, and the image side surface is convex;

[0008] The second lens with positive focal power, the object side surface is convex;

[0009] The third lens with positive focal power;

[0010] The fourth lens with negative focal power;

[0011] The fifth lens with positive focal power, the object side surface is convex;

[0012] The sixth lens with positive focal power, the object side surface is convex, and the image side surface is convex;

[0013] The seventh lens with negative focal power, the object side surface and the image side surface are both concave;

[0014] Wherein, the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: -0.91<(R1-R2) / (R1+R2)<-0.07.

[0015] It is further preferred that the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.9 < TTL / f < 2.8; the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 3.1 < TTL / IH < 5.1.

[0016] It is further preferred that the real image height IH corresponding to the maximum field of view angle of the optical lens, the effective focal length f of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.01; the total track length TTL of the optical lens, the real image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 0.36 / ° < TTL / (IH / 2) / (FOV / 2) < 0.66 / °.

[0017] It is further preferred that the real image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.51 < IH / f < 0.63; the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.15 < BFL / f < 0.3.

[0018] It is further preferred that the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -45 < f1 / f < -1.7; the object side surface curvature radius R1 of the first lens and the effective focal length f of the optical lens satisfy: -1.2 < R1 / f < -0.75; the image side surface curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: -19 < R2 / f < -0.9.

[0019] It is further preferred that the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.2 < f2 / f < 2.1; the object side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: 1 < R3 / f < 30.

[0020] It is further preferred that the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.8 < f5 / f < 1.8; the object side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5 < R9 / f < 2.2.

[0021] It is further preferred that the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0.6 < f6 / f < 1.7; the object side surface curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.75 < R11 / f < 1.9; the image side surface curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: -46 < R12 / f < -1.2.

[0022] It is further preferred that the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.6 < f7 / f < -0.46; the object side surface curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: -1.2 < R13 / f < -0.35; the image side surface curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.6 < R14 / f < 168.

[0023] It is further preferred that the effective focal length f of the optical lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: 0.7 < f567 / f < 3.5.

[0024] It is further preferred that the object side surface curvature radius R11 of the sixth lens and the image side surface curvature radius R12 of the sixth lens satisfy: -0.96 < (R11+R12) / (R11-R12) < -0.18; the object side surface curvature radius R13 of the seventh lens and the image side surface curvature radius R14 of the seventh lens satisfy: -1 < (R13+R14) / (R13-R14) < 0.21.

[0025] It is further preferred that the object side surface half light entrance radius d11 of the sixth lens and the object side surface half light entrance sag Sag11 of the sixth lens satisfy: 0.07 < Sag11 / d11 < 0.21; the image side surface half light entrance radius d12 of the sixth lens and the image side surface half light entrance sag Sag12 of the sixth lens satisfy: -0.13 < Sag12 / d12 < 0.

[0026] The optical lens provided by the application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as long focal length, large aperture, high imaging quality and the like. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, wherein:

[0028] Figure 1The structural schematic diagram of the optical lens in the embodiment 1 of the present application.

[0029] Figure 2 The structural schematic diagram of the optical lens in the embodiment 2 of the present application.

[0030] Figure 3 The structural schematic diagram of the optical lens in the embodiment 3 of the present application.

[0031] Figure 4 The structural schematic diagram of the optical lens in the embodiment 4 of the present application.

[0032] Figure 5 The structural schematic diagram of the optical lens in the embodiment 5 of the present application.

[0033] Figure 6 The structural schematic diagram of the optical lens in the embodiment 6 of the present application.

[0034] Figure 7 The structural schematic diagram of the optical lens in the embodiment 7 of the present application.

[0035] Figure 8 The structural schematic diagram of the optical lens in the embodiment 8 of the present application.

[0036] Figure 9 The structural schematic diagram of the optical lens in the embodiment 9 of the present application.

[0037] Figure 10 The structural schematic diagram of the optical lens in the embodiment 10 of the present application.

[0038] Figure 11 The structural schematic diagram of the optical lens in the embodiment 11 of the present application.

[0039] Figure 12 The structural schematic diagram of the optical lens in the embodiment 12 of the present application.

[0040] Figure 13 The structural schematic diagram of the optical lens in the embodiment 13 of the present application.

[0041] Figure 14 The structural schematic diagram of the optical lens in the embodiment 14 of the present application.

[0042] Figure 15 The structural schematic diagram of the optical lens in the embodiment 15 of the present application.

[0043] Figure 16 The structural schematic diagram of the optical lens in the embodiment 16 of the present application.

[0044] Figure 17 The structural schematic diagram of the optical lens in the embodiment 17 of the present application.

[0045] Figure 18 FIG. 1 is a schematic diagram of the structure of an optical lens according to an embodiment of the present application.

[0046] Figure 19 FIG. 2 is a schematic diagram of the structure of an optical lens according to an embodiment of the present application.

[0047] Figure 20 FIG. 3 is a schematic diagram of the structure of an optical lens according to an embodiment of the present application.

[0048] Figure 21 FIG. 4 is a schematic diagram of the structure of an optical lens according to an embodiment of the present application.

[0049] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0050] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0051] It is to be noted that, in the present specification, the expressions first, second, third, etc. are used only to distinguish one feature from another feature, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0052] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0053] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0054] It should also be understood that the use of the terms "have", "has", "having", "include", "including", "comprise", "comprising", "contain" or "containing" 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. In addition, when describing the embodiments of the present application, the use of "can" means "one or more embodiments of the present application". Also, the use of the term "exemplary" is intended to present an example or an illustration.

[0055] 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.

[0056] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other if there is no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0057] The optical lens provided by the embodiments of the present application is composed of seven lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.

[0058] In some embodiments, the first lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface. The second lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which can be a concave surface or a convex surface. The third lens can have a positive focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The fourth lens can have a negative focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The fifth lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which can be a concave surface or a convex surface. The sixth lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface. The seventh lens can have a negative focal power, the object side surface and the image side surface of which are both concave surfaces.

[0059] In some embodiments, the optical lens can further include a diaphragm, which can be located between the fourth lens and the fifth lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. In addition, when the diaphragm is located between the fourth lens and the fifth lens, the diaphragm can reasonably distribute the functions of the first lens to the seventh lens, for example, the first lens, the second lens, the third lens and the fourth lens can be used to receive light to a greater extent, and the fifth lens to the seventh lens can be used to correct the function of the aberration, which is beneficial to balance the structure of the entire optical system. In addition, when the diaphragm is located between the fourth lens and the fifth lens, the correction of the diaphragm aberration is facilitated.

[0060] In some embodiments, the optical lens can further include a filter and a protective glass, which can be sequentially arranged along the optical axis between the seventh lens and the imaging surface. The filter is used to filter out the interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting the normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged, and can improve the impact resistance and scratch resistance of the optical lens, while having little effect on the imaging quality of the optical lens.

[0061] In some embodiments, the third lens and the fourth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0062] In some embodiments, the object side surface radius of curvature R1 of the first lens and the image side surface radius of curvature R2 of the first lens satisfy: -0.91<(R1-R2) / (R1+R2)<-0.07. Satisfying the above range can reduce the light deflection angle as much as possible while ensuring that the optical lens has a larger field of view, and reduces the difficulty of aberration correction from the light from the edge field of view.

[0063] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.9<TTL / f<2.8. Satisfying the above range can effectively limit the length of the lens while realizing long focus, which is beneficial to realize the miniaturization of the optical lens. More specifically, 1.95<TTL / f<2.74.

[0064] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of view of the optical lens satisfy: 3.1 < TTL / IH < 5.1. Meeting the above range ensures that, with the same total length of the lens, it has a larger image plane, can match imaging chips of larger sizes to achieve high-definition imaging, and better achieves the balance between the small total length and the large image plane of the lens. More specifically, 3.16 < TTL / IH < 5.08.

[0065] In some embodiments, the true image height IH corresponding to the maximum field angle of view of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.95 < (IH / 2) / (f × Tan(FOV / 2)) < 1.01. Meeting the above range can control the optical lens to have less distortion and improve the imaging quality.

[0066] In some embodiments, the total optical length TTL of the optical lens, the true image height IH corresponding to the maximum field angle of view of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.36 / ° < TTL / (IH / 2) / (FOV / 2) < 0.66 / °. Meeting the above range can limit the length of the optical lens under the condition of the same imaging area and the same field angle of view, and achieve miniaturization of the optical lens.

[0067] In some embodiments, the true image height IH corresponding to the maximum field angle of view of the optical lens and the effective focal length f of the optical lens satisfy: 0.51 < IH / f < 0.63. Meeting the above range can control the image height and focal length of the optical lens within a reasonable range, which helps the optical lens to have the characteristic of a large image plane and improve the imaging quality.

[0068] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.15 < BFL / f < 0.3. Meeting the above range can define that the optical lens has an appropriate back focus, facilitate the reasonable arrangement of the positions of each lens, and at the same time reduce the processing and assembly difficulty.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -45 < f1 / f < -1.7; the object-side surface curvature radius R1 of the first lens and the effective focal length f of the optical lens satisfy: -1.2 < R1 / f < -0.75; and the image-side surface curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy: -19 < R2 / f < -0.9. By setting the first lens to have a negative refractive power and a suitable surface shape, the first lens can collect as much light as possible into the rear optical system, thereby achieving a large field of view while increasing the light flux, when the above ranges are satisfied. More specifically, -44.52 < f1 / f < -1.72; -1.13 < R1 / f < -0.78; and -18.22 < R2 / f < -0.99.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.2 < f2 / f < 2.1; and the object-side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: 1 < R3 / f < 30. By setting the second lens to have a suitable positive refractive power and a suitable surface shape, the second lens can compress the height of peripheral light rays, thereby reducing the aperture of the rear lens, while balancing aberrations and improving resolution, when the above ranges are satisfied. More specifically, 1.2 < f2 / f < 2.02; and 1.03 < R3 / f < 29.13.

[0071] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.8 < f5 / f < 1.8; and the object-side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5 < R9 / f < 2.2. By setting the fifth lens to have a positive refractive power and a suitable surface shape, the fifth lens can compress light rays while correcting the field curvature and distortion of the optical lens, thereby improving the imaging quality of the optical lens, when the above ranges are satisfied. More specifically, 0.84 < f5 / f < 1.72; and 0.5 < R9 / f < 2.18.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0.6 < f6 / f < 1.7; the object-side surface curvature radius R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.75 < R11 / f < 1.9; the image-side surface curvature radius R12 of the sixth lens and the effective focal length f of the optical lens satisfy: -46 < R12 / f < -1.2. Satisfying the above ranges, the sixth lens is limited to have positive refractive power and suitable surface shape, which is beneficial to light convergence, smooth transition of light trend to the rear, reduction of the height of light incident to the rear, slowing down of the upward trend of light, avoidance of light energy loss caused by too large angle between the main light ray and the chip when the large field of view light reaches the imaging surface, improvement of the illumination of the edge field of view, and realization of short optical total length. More specifically, 0.61 < f6 / f < 1.66; 0.79 < R11 / f < 1.84; -45.53 < R12 / f < -1.22.

[0073] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.6 < f7 / f < -0.46; the object-side surface curvature radius R13 of the seventh lens and the effective focal length f of the optical lens satisfy: -1.2 < R13 / f < -0.35; the image-side surface curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: 0.6 < R14 / f < 168. Satisfying the above ranges, various aberrations generated by the front lens group can be effectively balanced, and meanwhile, the divergence degree of light can be increased, the area of light entering the imaging surface can be increased, the large target surface imaging of the lens can be realized, and the imaging quality of the optical lens can be improved. More specifically, -1.11 < R13 / f < -0.39; 0.6 < R14 / f < 167.74.

[0074] In some embodiments, the effective focal length f of the optical lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: 0.7 < f567 / f < 3.5. Satisfying the above ranges, by reasonably setting the focal length proportion of the lens group after the stop, the aberration of the lens group before the stop can be balanced, and the overall imaging quality can be improved. More specifically, 0.75 < f567 / f < 3.43.

[0075] In some embodiments, the object-side surface curvature radius R11 of the sixth lens and the image-side surface curvature radius R12 of the sixth lens satisfy: -0.96 < (R11+R12) / (R11-R12) < -0.18. Satisfying the above ranges, the light can enter the rear lens gently, the field curvature can be reduced, the off-axis point aberration can be corrected, the correction of the entire optical lens aberration can be facilitated, and the imaging quality of the optical lens can be improved.

[0076] In some embodiments, the seventh lens satisfies: -1 < (R13+R14) / (R13-R14) < 0.21, where R13 is the radius of curvature of the object-side surface of the seventh lens, and R14 is the radius of curvature of the image-side surface of the seventh lens. The seventh lens satisfies the above range, the surface type of the seventh lens is controlled, which is beneficial to increase the imaging area and the field of view of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens.

[0077] In some embodiments, the sixth lens satisfies: 0.07 < Sag11 / d11 < 0.21, where Sag11 is the sagittal height of the object-side half-field ray of the sixth lens, and d11 is the object-side half-field ray height of the sixth lens; and the sixth lens satisfies: -0.13 < Sag12 / d12 < 0, where Sag12 is the sagittal height of the image-side half-field ray of the sixth lens, and d12 is the image-side half-field ray height of the sixth lens. The sixth lens satisfies the above range, which is helpful to control the trend of the edge field of view light, and highlight the central field of view detail information of the optical lens.

[0078] In some embodiments, the optical lens satisfies: 16° < FOV / Fno < 22°, where FOV is the maximum field of view of the optical lens, and Fno is the aperture value of the optical lens. The optical lens satisfies the above range, which defines the optical lens to have a suitable field of view and aperture value, can collect light rays of a large angle and obtain good imaging quality. More specifically, 16.66° < FOV / Fno < 21.51°.

[0079] In some embodiments, the optical lens satisfies: 0.8 < IH / EPD < 1.1, where IH is the real image height corresponding to the maximum field of view of the optical lens, and EPD is the entrance pupil diameter of the optical lens. The optical lens satisfies the above range, which can increase the width of the light ray bundle entering the optical lens, so that the brightness of the optical lens at the image plane is improved to avoid dark corners. More specifically, 0.82 < IH / EPD < 1.04.

[0080] In some embodiments, the optical lens satisfies: 0.58 < ∑CT / TTL < 0.71, where TTL is the total track length of the optical lens, and ∑CT is the sum of the central thicknesses of the first lens to the seventh lens along the optical axis. The optical lens satisfies the above range, which can effectively compress the total length of the optical lens, and is beneficial to the structural design and production process of the optical lens.

[0081] In some embodiments, the optical lens satisfies: 0.75 < f3 / f < 1.2, where f is the effective focal length of the optical lens, and f3 is the focal length of the third lens. The third lens satisfies the above range, which defines the third lens to have a proper positive refractive power, and the light rays are further converged. The third lens with a positive refractive power and the fourth lens with a negative refractive power are cemented, which is beneficial to make the light rays enter the rear lens gently, can adjust the optical path difference between different fields of view, and improve the resolution. More specifically, 0.78 < f3 / f < 1.16.

[0082] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -1.1 < f4 / f < -0.4. By satisfying the above range, the fourth lens is defined to have a proper negative refractive power, the light rays emitted by the third lens can be diverged, the light rays of the edge field of view have an upward trend, the image points on the imaging surface are away from the optical axis, and the effect of matching a large chip is facilitated, a larger picture is obtained, aberration can be effectively eliminated, and the resolving power of the optical lens is improved. More specifically, -1.08 < f4 / f < -0.44.

[0083] In some embodiments, the optical lens satisfies the following conditional expressions: 10 mm < f < 16 mm; 29° < FOV < 35°; 6 mm < EPD < 10 mm; 27 mm < TTL < 32 mm; 1.5 < Fno < 1.9; 5.5 mm < IH < 10 mm; 21° < CRA < 33°; 2.3 mm < BFL < 3.3 mm. In the conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, IH represents the real image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, and BFL represents the back focal length of the optical lens. By satisfying the above range, the optical lens has one or more advantages such as a large target surface, a large aperture, and a long focal length. More specifically, 10.99 mm < f < 15.34 mm; 6.11 mm < EPD < 9.59 mm; 27.9 mm < TTL < 31.31 mm; 1.59 < Fno < 1.81; 21.3° < CRA < 32.34°; 2.38 mm < BFL < 3.25 mm; 29.9° < FOV < 34.41°; 5.9 mm < IH < 9.48 mm.

[0084] In some embodiments, the material of the lens in the optical lens provided by the present application can be glass or plastic. When the material of the lens is plastic, the production cost can be effectively reduced. When the material of the lens is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present application can adopt a full-glass lens structure, can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0085] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens of the present application adopt a spherical lens.

[0086] The present application is further described in the following embodiments. In each embodiment, the thickness, the radius of curvature and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments only, and any changes, substitutions, combinations or simplifications made without departing from the innovative points of the present application should be regarded as equivalent replacement modes, and are included in the protection scope of the present application.

[0087] Embodiment 1

[0088] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the present application. The optical lens 100 includes, in order along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0089] The first lens L1 has a negative focal power, the object side S1 thereof is a concave surface, and the image side S2 thereof is a convex surface.

[0090] The second lens L2 has a positive focal power, the object side S3 thereof is a convex surface, and the image side S4 thereof is a convex surface.

[0091] The third lens L3 has a positive focal power, and both the object side S5 and the image side S6 thereof are convex surfaces.

[0092] The fourth lens L4 has a negative focal power, the object side S6 thereof is a concave surface, and the image side S7 thereof is a concave surface.

[0093] The third lens L3 and the fourth lens L4 form a cemented lens group with a negative focal power, that is, the cemented surface of the image side of the third lens L3 and the object side of the fourth lens L4 is S6.

[0094] The fifth lens L5 has a positive focal power, and both the object side S8 and the image side S9 thereof are convex surfaces.

[0095] The sixth lens L6 has a positive focal power, the object side S10 thereof is a convex surface, and the image side S11 thereof is a convex surface.

[0096] The seventh lens L7 has negative focal power, the object side S12 is a concave surface, and the image side S13 is a concave surface;

[0097] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0098] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0099] The imaging surface S18 is a flat surface.

[0100] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are glass spherical lenses.

[0101] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1.

[0102] Table 1

[0103]

[0104] Embodiment 2

[0105] Referring to Figure 2 , which is a structure schematic diagram of the optical lens 200 provided in Embodiment 2 of the present application. Compared with Embodiment 1, the main difference is that the third lens L3 and the fourth lens L4 form a cemented lens group with positive focal power; the curvature radius, the lens thickness and other optical parameters of the surfaces of the lenses are different.

[0106] The related parameters of the lenses in the optical lens 200 in Embodiment 2 are shown in Table 2.

[0107] Table 2

[0108]

[0109]

[0110] Embodiment 3

[0111] Referring to Figure 3 , which is a structure schematic diagram of the optical lens 300 provided in Embodiment 3 of the present application. Compared with Embodiment 1, the main difference is that the third lens L3 and the fourth lens L4 form a cemented lens group with positive focal power; the curvature radius, the lens thickness and other optical parameters of the surfaces of the lenses are different.

[0112] The related parameters of the lenses in the optical lens 300 in Embodiment 3 are shown in Table 3.

[0113] Table 3

[0114]

[0115]

[0116] Example 4

[0117] Please see Figure 4 The figure shown is a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that the third lens L3 and the fourth lens L4 form a cemented lens group with positive optical power; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0118] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4.

[0119] Table 4

[0120]

[0121]

[0122] Example 5

[0123] Please see Figure 5 The figure shows a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S4 of the second lens L2 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0124] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5.

[0125] Table 5

[0126]

[0127] Example 6

[0128] Please see Figure 6 The figure shown is a schematic diagram of the structure of the optical lens 600 provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S4 of the second lens L2 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0129] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6.

[0130] Table 6

[0131]

[0132] Example 7

[0133] Please see Figure 7 The figure shown is a schematic diagram of the structure of the optical lens 700 provided in Embodiment 7 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S4 of the second lens L2 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0134] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7.

[0135] Table 7

[0136]

[0137]

[0138] Example 8

[0139] Please see Figure 8 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S4 of the second lens L2 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0140] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3.

[0141] Table 3

[0142]

[0143]

[0144] Example 9

[0145] Please see Figure 9 The figure shown is a schematic diagram of the structure of the optical lens 900 provided in Embodiment 9 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S4 of the second lens L2 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0146] The relevant parameters of each lens in the optical lens 900 in Example 9 are shown in Table 9.

[0147] Table 9

[0148]

[0149] Example 10

[0150] Please see Figure 10Figure 10 shows a structural schematic diagram of the optical lens 1000 provided in the embodiment 10 of the present application, and the main difference between this embodiment and the embodiment 1 is that the image side surface of the third lens L3 is a concave surface, the object side surface S6 of the fourth lens L4 is a convex surface, and the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0151] The related parameters of each lens in the optical lens 1000 in the embodiment 10 are shown in Table 10.

[0152] Table 10

[0153]

[0154] Embodiment 11

[0155] Please refer to Figure 11 Figure 11 shows a structural schematic diagram of the optical lens 1100 provided in the embodiment 11 of the present application, and the main difference between this embodiment and the embodiment 1 is that the image side surface of the third lens L3 is a concave surface, the object side surface S6 of the fourth lens L4 is a convex surface, and the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0156] The related parameters of each lens in the optical lens 1100 in the embodiment 11 are shown in Table 11.

[0157] Table 11

[0158]

[0159]

[0160] Embodiment 12

[0161] Please refer to Figure 12 Figure 12 shows a structural schematic diagram of the optical lens 1200 provided in the embodiment 12 of the present application, and the main difference between this embodiment and the embodiment 1 is that the image side surface of the third lens L3 is a concave surface, the object side surface S6 of the fourth lens L4 is a convex surface, and the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0162] The related parameters of each lens in the optical lens 1200 in the embodiment 12 are shown in Table 12.

[0163] Table 12

[0164]

[0165]

[0166] Embodiment 13

[0167] Please refer to Figure 13Figure 13 shows a structural schematic diagram of the optical lens 1300 provided in the embodiment 13 of the present application, and the main difference between this embodiment and the embodiment 1 is that the image side surface of the third lens L3 is a concave surface, the object side surface S6 of the fourth lens L4 is a convex surface, and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0168] The related parameters of each lens in the optical lens 1300 in the embodiment 13 are shown in Table 13.

[0169] Table 13

[0170]

[0171]

[0172] Embodiment 14

[0173] Please refer to Figure 14 Figure 14 shows a structural schematic diagram of the optical lens 1400 provided in the embodiment 14 of the present application, and the main difference between this embodiment and the embodiment 1 is that the image side surface of the third lens L3 is a concave surface, the object side surface S6 of the fourth lens L4 is a convex surface, and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0174] The related parameters of each lens in the optical lens 1400 in the embodiment 14 are shown in Table 14.

[0175] Table 14

[0176]

[0177] Embodiment 15

[0178] Please refer to Figure 15 Figure 15 shows a structural schematic diagram of the optical lens 1500 provided in the embodiment 15 of the present application, and the main difference between this embodiment and the embodiment 1 is that the object side surface S5 of the third lens L3 is a concave surface, the image side surface S7 of the fourth lens L4 is a convex surface, and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0179] The related parameters of each lens in the optical lens 1500 in the embodiment 15 are shown in Table 15.

[0180] Table 15

[0181]

[0182] Embodiment 16

[0183] Please refer to Figure 16Figure 16 shows a structural schematic diagram of the optical lens 1600 provided in the embodiment 16 of the present application, compared with the embodiment 1, the main difference lies in that the object side S5 of the third lens L3 is a concave surface; the image side S7 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0184] The related parameters of each lens in the optical lens 1600 in the embodiment 16 are shown in Table 16.

[0185] Table 16

[0186]

[0187]

[0188] Embodiment 17

[0189] Please refer to Figure 17 Figure 17 shows a structural schematic diagram of the optical lens 1700 provided in the embodiment 17 of the present application, compared with the embodiment 1, the main difference lies in that the object side S5 of the third lens L3 is a concave surface; the image side S7 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0190] The related parameters of each lens in the optical lens 1700 in the embodiment 17 are shown in Table 17.

[0191] Table 17

[0192]

[0193]

[0194] Embodiment 18

[0195] Please refer to Figure 18 Figure 18 shows a structural schematic diagram of the optical lens 1800 provided in the embodiment 18 of the present application, compared with the embodiment 1, the main difference lies in that the object side S5 of the third lens L3 is a concave surface; the image side S7 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0196] The related parameters of each lens in the optical lens 1800 in the embodiment 18 are shown in Table 18.

[0197] Table 18

[0198]

[0199] Embodiment 19

[0200] Please refer to Figure 19, as shown in Figure 19 is a structural schematic diagram of the optical lens 1900 provided in the embodiment 19 of the present application. Compared with the embodiment 1, the main difference is that the image side surface S9 of the fifth lens L5 is a concave surface; the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0201] The related parameters of each lens in the optical lens 1900 in the embodiment 19 are shown in Table 19.

[0202] Table 19

[0203]

[0204] Embodiment 20

[0205] Please refer to Figure 20 , as shown in Figure 20 is a structural schematic diagram of the optical lens 2000 provided in the embodiment 20 of the present application. Compared with the embodiment 1, the main difference is that the image side surface S9 of the fifth lens L5 is a concave surface; the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0206] The related parameters of each lens in the optical lens 2000 in the embodiment 20 are shown in Table 20.

[0207] Table 20

[0208]

[0209]

[0210] Embodiment 21

[0211] Please refer to Figure 13 , as shown in Figure 21 is a structural schematic diagram of the optical lens 2100 provided in the embodiment 21 of the present application. Compared with the embodiment 1, the main difference is that the image side surface S9 of the fifth lens L5 is a concave surface; the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0212] The related parameters of each lens in the optical lens 2100 in the embodiment 21 are shown in Table 21.

[0213] Table 21

[0214]

[0215]

[0216] Please refer to Table 22-1 and Table 22-2, which are the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in each embodiment.

[0217] Table 22-1

[0218]

[0219]

[0220] Table 22-2

[0221]

[0222]

[0223] In summary of the above embodiments, the optical lens provided by the present application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as long focal length, large aperture, high imaging quality, etc.

[0224] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0225] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens comprising seven lenses, characterized in that, It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with negative optical power, whose object side is concave and whose image side is convex; A second lens with positive optical power, whose object side is convex; A third lens with positive optical power; A fourth lens with negative optical power; A fifth lens with positive optical power, whose object side is convex; A sixth lens with positive optical power, whose object side is convex and whose image side is convex; A seventh lens with negative optical power, whose object side and image side are both concave; Wherein, the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: -0.91 < (R1 - R2) / (R1 + R2) < -0.07; The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.9 < TTL / f < 2.8; The total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 3.1 < TTL / IH < 5.

1.

2. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.95 < TTL / f < 2.74; The total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 3.16 < TTL / IH < 5.

08.

3. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.95 < (IH / 2) / (f×Tan(FOV / 2)) < 1.0l; The total optical length TTL of the optical lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.36 / ° < TTL / (IH / 2) / (FOV / 2) < 0.66 / °.

4. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.51 < IH / f < 0.63; The effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.15 < BFL / f < 0.

3.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -45 < f1 / f < -1.7; The curvature radius R1 of the object side of the first lens and the effective focal length f of the optical lens satisfy: -1.2 < R1 / f < -0.75; The curvature radius R2 of the image side of the first lens and the effective focal length f of the optical lens satisfy: -19 < R2 / f < -0.

9.

6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.2 < f2 / f < 2.1; The curvature radius R3 of the object side of the second lens and the effective focal length f of the optical lens satisfy: 1 < R3 / f < 30.

7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.8 < f5 / f < 1.8; the radius of curvature R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5 < R9 / f < 2.

2.

8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0.6 < f6 / f < 1.7; the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 0.75 < R11 / f < 1.9; the radius of curvature R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -46 < R12 / f < -1.

2.

9. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -0.6 < f7 / f < -0.46; the radius of curvature R13 of the object side surface of the seventh lens and the effective focal length f of the optical lens satisfy: -1.2 < R13 / f < -0.35; the radius of curvature R14 of the image side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 0.6 < R14 / f < 168.

10. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the combined focal length f567 of the fifth lens, the sixth lens and the seventh lens satisfy: 0.7 < f567 / f < 3.

5.

11. The optical lens according to claim 1, characterized in that, The radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -0.96 < (R11 + R12) / (R11 - R12) < -0.18; the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: -1 < (R13 + R14) / (R13 - R14) < 0.

21.

12. The optical lens according to claim 1, characterized in that, The clear aperture semi-diameter d11 of the object side surface of the sixth lens and the sagitta Sag11 of the clear aperture of the object side surface of the sixth lens satisfy: 0.07 < Sag11 / d11 < 0.21; the clear aperture semi-diameter d12 of the image side surface of the sixth lens and the sagitta Sag12 of the clear aperture of the image side surface of the sixth lens satisfy: -0.13 < Sag12 / d12 < 0.

Images