Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an imaging surface along an optical axis, the second lens has positive focal power; the third lens has positive focal power; the fourth lens has positive focal power; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; the sixth lens has positive focal power; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; wherein the effective focal length f of the optical lens and the curvature radius R14 of the image side surface of the seventh lens meet the formula: R14 / flt; 3.6, 3.6; the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy 0.3 lt; (R9-R10) / (R9 + R10) lt; 1. According to the optical lens provided by the invention, through reasonable configuration of the surface types of the lenses and reasonable matching of the focal power, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved.

Description

TECHNICAL FIELD

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

[0002] With the increasing demand for driving experience, vehicle application type optical lenses are increasingly used in intelligent driving, and vehicle optical lenses are playing an increasingly important role 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. The lenses of the existing ADAS system need a long focal length in long-distance imaging, but a long focal length will result in a long total length of the lens, which is not conducive to the miniaturization of the lens. At the same time, such lenses also need to have good imaging quality in the dark or weak light environment. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages such as long focal length, high resolution and high imaging quality.

[0005] The present application provides an optical lens, which has a total of seven lenses, and includes, in order along the optical axis from the object side to the imaging surface:

[0006] a first lens with negative refractive power;

[0007] a second lens with positive refractive power;

[0008] a third lens with positive refractive power;

[0009] a fourth lens with positive refractive power;

[0010] a fifth lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave;

[0011] a sixth lens with positive refractive power;

[0012] a seventh lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is convex;

[0013] wherein the effective focal length f of the optical lens and the image side surface curvature radius R14 of the seventh lens satisfy: R14 / f<-3.6;

[0014] the object side surface curvature radius R9 of the fifth lens and the image side surface curvature radius R10 of the fifth lens satisfy: 0.3<(R9-R10) / (R9+R10)<1.

[0015] It is further preferred that a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 12.2°<FOV / Fno<15.3°.

[0016] It is further preferred that a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 12.2°<FOV / Fno<15.3°.

[0017] It is further preferred that a maximum field of view FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 12.2°<FOV / Fno<15.3°.

[0018] It is further preferred that an effective focal length f of the optical lens and a combined focal length f34567 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.7<f34567 / f<1.7.

[0019] It is further preferred that an effective focal length f of the optical lens and a radius of curvature R9 of an object side surface of the fifth lens satisfy: R9 / f>2.3.

[0020] It is further preferred that a focal length f5 of the fifth lens and a radius of curvature R9 of an object side surface of the fifth lens satisfy: R9 / f5<-3.1.

[0021] It is further preferred that a focal length f7 of the seventh lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: R14 / f7>2.8.

[0022] It is further preferred that a radius of curvature R13 of an object side surface of the fifth lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: -1<(R13-R14) / (R13+R14)<-0.6.

[0023] It is further preferred that a sagittal height Sag9 of an object side surface of the fifth lens and a half-diameter d9 of an object side surface of the fifth lens satisfy: 0<Sag9 / d9<0.1; a sagittal height Sag14 of an image side surface of the seventh lens and a half-diameter d14 of an image side surface of the seventh lens satisfy: -0.3<Sag14 / d14<0.2.

[0024] The optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of optical power, so that the lens has one or more advantages of long focal length, miniaturization, high resolution, and high imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0026] Figure 1 A schematic diagram of the optical lens of Example 1 of the present application.

[0027] Figure 2 A F-Tanθ distortion curve of the optical lens of Example 1 of the present application.

[0028] Figure 3 A MTF curve of the optical lens of Example 1 of the present application.

[0029] Figure 4 A schematic diagram of the optical lens of Example 2 of the present application.

[0030] Figure 5 A F-Tanθ distortion curve of the optical lens of Example 2 of the present application.

[0031] Figure 6 A MTF curve of the optical lens of Example 2 of the present application.

[0032] Figure 7 A schematic diagram of the optical lens of Example 3 of the present application.

[0033] Figure 8 A F-Tanθ distortion curve of the optical lens of Example 3 of the present application.

[0034] Figure 9 A MTF curve of the optical lens of Example 3 of the present application.

[0035] Figure 10 A schematic diagram of the optical lens of Example 4 of the present application.

[0036] Figure 11 A F-Tanθ distortion curve of the optical lens of Example 4 of the present application.

[0037] Figure 12 A MTF curve of the optical lens of Example 4 of the present application.

[0038] Figure 13 A schematic diagram of the optical lens of Example 5 of the present application.

[0039] Figure 14 A F-Tanθ distortion curve of the optical lens of Example 5 of the present application.

[0040] Figure 15 A MTF curve of the optical lens of Example 5 of the present application.

[0041] Figure 16 Structure diagram of optical lens in embodiment 6 of the present application.

[0042] Figure 17 F-Tanθ distortion curve diagram of optical lens in embodiment 6 of the present application.

[0043] Figure 18 MTF curve diagram of optical lens in embodiment 6 of the present application.

[0044] Figure 19 Structure diagram of optical lens in embodiment 7 of the present application.

[0045] Figure 20 F-Tanθ distortion curve diagram of optical lens in embodiment 7 of the present application.

[0046] Figure 21 MTF curve diagram of optical lens in embodiment 7 of the present application.

[0047] Figure 22 Structure diagram of optical lens in embodiment 8 of the present application.

[0048] Figure 23 F-Tanθ distortion curve diagram of optical lens in embodiment 8 of the present application.

[0049] Figure 24 MTF curve diagram of optical lens in embodiment 8 of the present application.

[0050] Figure 25 Structure diagram of optical lens in embodiment 9 of the present application.

[0051] Figure 26 F-Tanθ distortion curve diagram of optical lens in embodiment 9 of the present application.

[0052] Figure 27 MTF curve diagram of optical lens in embodiment 9 of the present application.

[0053] Figure 28 Structure diagram of optical lens in embodiment 10 of the present application.

[0054] Figure 29 F-Tanθ distortion curve diagram of optical lens in embodiment 10 of the present application.

[0055] Figure 30 MTF curve diagram of optical lens in embodiment 10 of the present application.

[0056] Figure 31 Structure diagram of optical lens in embodiment 11 of the present application.

[0057] Figure 32F-Tanθ distortion curve diagram of the optical lens in embodiment 11 of the present application.

[0058] Figure 33 MTF curve diagram of the optical lens in embodiment 11 of the present application.

[0059] Figure 34 Structure schematic diagram of the optical lens in embodiment 12 of the present application.

[0060] Figure 35 F-Tanθ distortion curve diagram of the optical lens in embodiment 12 of the present application.

[0061] Figure 36 MTF curve diagram of the optical lens in embodiment 12 of the present application.

[0062] Figure 37 Structure schematic diagram of the optical lens in embodiment 13 of the present application.

[0063] Figure 38 F-Tanθ distortion curve diagram of the optical lens in embodiment 13 of the present application.

[0064] Figure 39 MTF curve diagram of the optical lens in embodiment 13 of the present application.

[0065] Figure 40 Structure schematic diagram of the optical lens in embodiment 14 of the present application.

[0066] Figure 41 F-Tanθ distortion curve diagram of the optical lens in embodiment 14 of the present application.

[0067] Figure 42 MTF curve diagram of the optical lens in embodiment 14 of the present application.

[0068] Figure 43 Structure schematic diagram of the optical lens in embodiment 15 of the present application.

[0069] Figure 44 F-Tanθ distortion curve diagram of the optical lens in embodiment 15 of the present application.

[0070] Figure 45 MTF curve diagram of the optical lens in embodiment 15 of the present application.

[0071] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0072] For a better understanding of the present application, various aspects of the present application will be presented in more detail by referring to the attached drawings. It should be understood that these detailed descriptions are merely descriptive of the embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0073] It should be noted that the expressions first, second, third and the like in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as a second lens or a third lens without departing from the teachings of the present application.

[0074] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake 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.

[0075] In this 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.

[0076] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", 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. Furthermore, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0077] 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 should also be understood that the terms 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.

[0078] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0079] The optical lens provided by the embodiment of the present application comprises 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.

[0080] The first lens can have a negative focal power, and the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof can be a concave surface or a convex surface. The second lens can have a positive focal power, and the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof can be a concave surface or a convex surface. The third lens can have a positive focal power, and the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof can be a concave surface or a convex surface. The fourth lens can have a positive focal power, and the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof can be a concave surface or a convex surface. The fifth lens can have a negative focal power, and the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface. The sixth lens can have a positive focal power, and the object side surface thereof can be a concave surface or a convex surface, and the image side surface thereof can be a concave surface or a convex surface. The seventh lens can have a negative focal power, and the object side surface thereof is a concave surface, and the image side surface thereof is a convex surface.

[0081] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the second lens and the third 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 second lens and the third lens, the diaphragm can reasonably distribute the functions of the first lens to the seventh lens, for example, the first lens and the second lens can be used to receive light to a greater extent, and the third lens to the seventh lens can be used for the function of correcting aberration, which is conducive to balancing the structure of the entire optical system. In addition, when the diaphragm is located between the second lens and the third lens, the diaphragm aberration can be corrected.

[0082] In some embodiments, the optical lens can further comprise a filter and a protective glass, which are sequentially arranged along the optical axis between the seventh lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting 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.

[0083] In some embodiments, the effective focal length f of the optical lens and the image side surface curvature radius R14 of the seventh lens satisfy: R14 / f<-3.6. Satisfying the above range limits the shape of the image side surface of the seventh lens, which is helpful to control the astigmatism and realize the high-pixel characteristics of the optical lens. More specifically, -12<R14 / f<-4.

[0084] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 0.3 < (R9-R10) / (R9+R10) < 1. Satisfying the above range reasonably limits the shape of the object side surface and the image side surface of the fifth lens, so that the fifth lens has a proper surface shape, and the aberration of the optical lens can be effectively corrected. More specifically, 0.7 < (R9-R10) / (R9+R10) < 1.

[0085] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 12.2° < FOV / Fno < 15.3°. Satisfying the above range limits the optical lens to have a proper field of view and aperture value, so that the optical lens can collect light rays of a large angle and obtain good imaging quality. More specifically, 13.7° < FOV / Fno < 14.5°.

[0086] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.2 < IH / EPD < 1.9. Satisfying the above range enables the optical lens to satisfy the conditions of large image surface and large aperture, while also satisfying that the edge field of view has sufficient image surface brightness to prevent the occurrence of dark corner phenomenon, thereby improving the imaging quality. More specifically, 1.3 < IH / EPD < 1.6.

[0087] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the radian θ of the maximum half field of view of the optical lens satisfy: 14.9 mm < (IH / 2) / θ < 23.8 mm. Satisfying the above range enables the optical lens to have a large image surface characteristic and realize high-definition imaging. More specifically, 16.5 mm < (IH / 2) / θ < 21.4 mm.

[0088] In some embodiments, the effective focal length f of the optical lens and the combined focal length f34567 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.7 < f34567 / f < 1.7. Satisfying the above range limits the lens group after the stop of the optical lens to have a proper focal length, so that the aberration generated by the lens group before the stop can be effectively corrected, and the imaging quality of the optical lens is improved. More specifically, 0.8 < f34567 / f < 1.6.

[0089] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R9 on the object side of the fifth lens satisfy: R9 / f>2.3. The effective focal length f of the optical lens and the radius of curvature R10 on the image side of the fifth lens satisfy: 0.3

[0090] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R13 on the object side of the seventh lens satisfy: -1.7

[0091] In some embodiments, the focal length f5 of the fifth lens and the radius of curvature R9 on the object side of the fifth lens satisfy: R9 / f5<-3.1. The focal length f5 of the fifth lens and the radius of curvature R10 on the image side of the fifth lens satisfy: -0.9

[0092] In some embodiments, the focal length f7 of the seventh lens and the radius of curvature R13 on the object side of the seventh lens satisfy: 0.4

[0093] In some embodiments, the radius of curvature R13 on the object side of the seventh lens and the radius of curvature R14 on the image side of the seventh lens satisfy: -1

[0094] In some embodiments, the sagittal height of the half field of the object side of the fifth lens Sagg and the half field of the object side of the fifth lens d9 satisfy: 0 < Sagg / d9 < 0.1; the sagittal height of the half field of the image side of the seventh lens Sagl4 and the half field of the image side of the seventh lens d14 satisfy: -0.3 < Sagl4 / d14 < 0.2. Satisfying the above range can effectively improve various aberrations of the edge field of view of the optical lens, and improve the imaging quality of the edge field of view of the optical lens. More specifically, 0 < Sagg / d9 < 0.06; -0.22 < Sagl4 / d14 < 0.12.

[0095] In some embodiments, the effective focal length f of the optical lens and the total track length TTL satisfy: 1.3 < TTL / f < 2.2. Satisfying the above range is conducive to limiting the total length of the lens while better realizing the long focal performance of the system. More specifically, the effective focal length f of the optical lens and the total track length TTL satisfy: 1.5 < TTL / f < 2.2.

[0096] In some embodiments, 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: 2.3 < TTL / IH < 3.9. Satisfying the above condition is conducive to realizing the balance between the small volume and the large image surface of the optical lens, so that the lens has a smaller total length while having higher resolution. More specifically, 2.5 < TTL / IH < 3.7.

[0097] In some embodiments, the effective focal length f of the optical lens and the maximum field of view angle FOV and the real image height IH corresponding to the maximum field of view angle satisfy: 0.9 < (IH / 2) / (f x tan(FOV / 2)) < 1.1. Satisfying the above range can control the size of distortion and improve the imaging quality of the optical lens. More specifically, 0.95 < (IH / 2) / (f x tan(FOV / 2)) < 1.05.

[0098] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.1 < BFL / f < 0.2. Satisfying the above range limits the optical lens to have a suitable back focus, facilitates reasonable arrangement of the positions of the lenses, and reduces the difficulty of processing and assembly.

[0099] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -11.3 < f1 / f < -1.2. Satisfying the above range limits the first lens to have an appropriate negative focal length, which is helpful for the optical lens to collect large-angle light, is helpful for controlling distortion and reducing field curvature, and thus improves the geometric precision of the imaging surface. More specifically, -10.1 < f1 / f < -1.6.

[0100] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.7 < f2 / f < 4.8. Satisfying the above range, the second lens is defined to have appropriate positive refractive power, which is conducive to the convergence of light rays, makes the divergent light rays entering the system from the front smoothly enter the rear optical system, and the light ray trend is more gentle, optimizes aberration, and improves resolution. More specifically, 2.1 < f2 / f < 4.5.

[0101] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.4 < f3 / f < 1.5. Satisfying the above range, the third lens is defined to have appropriate positive refractive power, which can effectively correct the aberration generated at the front end of the lens, and improve the imaging quality of the lens. More specifically, 0.7 < f3 / f < 1.3.

[0102] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.8 < f4 / f < 3.6. Satisfying the above range, the fourth lens is defined to have appropriate positive refractive power, which is helpful for the light ray trend to be stable and improve the imaging quality. More specifically, 1.1 < f4 / f < 3.3.

[0103] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -0.9 < f5 / f < -0.2. Satisfying the above range, the fifth lens is defined to have appropriate negative refractive power, which is helpful for increasing the imaging area and improving the imaging quality. More specifically, -0.8 < f5 / f < -0.6.

[0104] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 1.1 < f6 / f < 3.5. Satisfying the above range, the sixth lens is defined to have appropriate positive refractive power, which is helpful for reducing the aberration of the optical lens. More specifically, 1.5 < f6 / f < 3.1.

[0105] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -3.4 < f7 / f < -0.6. Satisfying the above range, the seventh lens is defined to have appropriate negative refractive power, which is conducive to increasing the imaging area of the optical lens, and at the same time can optimize the chromatic aberration of the optical lens and improve the imaging quality of the optical lens. More specifically, -3 < f7 / f < -0.9.

[0106] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 1.6 < TTL / ∑CT < 2.6. Satisfying the above range, the total optical length of the optical lens and the sum of the thicknesses of the lenses are reasonably configured, which is helpful for realizing high pixel characteristics and improving the imaging quality of the optical lens. More specifically, 1.6 < TTL / ∑CT < 2.4.

[0107] In some embodiments, the fourth lens and the fifth lens can be bonded to form a bonded lens, which can effectively correct chromatic aberration of the optical lens, reduce sensitivity of the optical lens to decentration, balance aberration of the optical lens, and improve imaging quality of the optical lens; and can also reduce assembly sensitivity of the optical lens, thereby reducing processing difficulty of the optical lens and improving assembly yield of the optical lens.

[0108] In some embodiments, the optical lens satisfies the condition formula: 16.5mm<f<20.7mm, 32.8°<FOV<34.6°, 6.8mm<EPD<8.6mm, 31.4mm<TTL<36.1mm, 2.3<Fno<2.5, 9.2mm<IH<13mm, 16.3°<CRA<33.5°, 2.2mm<BFL<3.2mm, wherein f represents an effective focal length of the optical lens, FOV represents a maximum field of view angle of the optical lens, EPD represents an entrance pupil diameter of the optical lens, TTL represents an optical total length of the optical lens, Fno represents an aperture value of the optical lens, IH represents a real image height corresponding to the maximum field of view angle of the optical lens, CRA represents a chief ray incidence angle at the maximum image height of the optical lens, and BFL represents a back focal length of the optical lens. Satisfying the above condition indicates that the optical lens provided in the embodiments has at least the characteristics of long focal length and large image surface.

[0109] In some embodiments, the lens material in the optical lens provided in the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material 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 in the present application can adopt a full-glass lens structure, which can reduce dispersion, effectively correct chromatic aberration of the optical lens, and improve imaging quality.

[0110] 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 second lens, the third lens, and the seventh lens in the optical lens provided in the present application can adopt an aspherical lens, and the first lens, the fourth lens, the fifth lens, and the sixth lens can adopt a spherical lens.

[0111] In various embodiments of the present application, when the lens adopts an aspherical lens, each aspherical surface shape of the optical lens satisfies the following equation:

[0112]

[0113] wherein z is the distance of the curved surface to the vertex of the curved surface in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the coefficient of the quadratic curved surface, and B, C, D, E and F are the coefficients of the fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order curved surface respectively.

[0114] The application will be 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 merely the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any change, substitution, combination or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and all are included in the protection scope of the application.

[0115] Embodiment 1

[0116] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in the embodiment 1 of the application, and the optical lens comprises, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0117] The first lens L1 has negative focal power, and the object side S1 and the image side S2 of the first lens L1 are both concave surfaces;

[0118] The second lens L2 has positive focal power, and the object side S3 and the image side S4 of the second lens L2 are both convex surfaces;

[0119] The third lens L3 has positive focal power, and the object side S5 and the image side S6 of the third lens L3 are both convex surfaces;

[0120] The fourth lens L4 has positive focal power, and the object side S7 of the fourth lens L4 is a convex surface and the image side S8 is a concave surface;

[0121] The fifth lens L5 has negative focal power, and the object side S8 of the fifth lens L5 is a convex surface and the image side S9 is a concave surface;

[0122] The fourth lens L4 and the fifth lens L5 are combined as a cemented lens group, and the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8;

[0123] The sixth lens L6 has positive focal power, and the object side S10 of the sixth lens L6 is a concave surface and the image side S11 is a convex surface;

[0124] The seventh lens L7 has negative focal power, and the object side S12 of the seventh lens L7 is a concave surface and the image side S13 is a convex surface;

[0125] The object side S14 and the image side S15 of the filter G1 are both planar surfaces;

[0126] The object side S16 and the image side S17 of the protective glass G2 are both planar surfaces;

[0127] The imaging surface S18 is a planar surface.

[0128] The first lens L1, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are glass spherical lenses; the second lens L2, the third lens L3 and the seventh lens L7 are glass aspherical lenses.

[0129] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0130] Table 1-1

[0131]

[0132]

[0133] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0134] Table 1-2

[0135] Surface number K B C D E F S3 -1.22E+01 -9.19E-05 3.88E-07 -1.25E-09 7.08E-11 8.83E-13 S4 -1.84E+02 -1.30E-04 1.66E-06 -2.06E-08 3.66E-10 -1.09E-12 S5 -6.59E+00 2.26E-04 -4.37E-06 7.49E-08 -9.08E-10 2.75E-12 S6 -7.98E+00 -1.83E-04 1.87E-06 -1.46E-08 -1.79E-11 -1.23E-12 S12 -1.81E+01 -1.95E-03 5.93E-05 -2.43E-06 6.23E-08 -8.37E-10 S13 2.00E+02 -5.00E-04 -2.26E-06 1.72E-08 -2.97E-09 3.09E-11

[0136] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in FIGS. Figure 2 、 Figure 3 .

[0137] Figure 2 The F-Tanθ distortion curve of Embodiment 1 is shown, which represents the F-Tanθ distortion of light rays at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within 0-2%, the image compression in the edge angle region is relatively flat, and the clarity of the unfolded image is effectively improved.

[0138] Figure 3 The MTF (Modulation Transfer Function) curve of Embodiment 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the present embodiment is above 0.2 within the full field of view, and within the range of 0-300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low and high frequency cases.

[0139] Embodiment 2

[0140] Please refer to Figure 4 , which is a structural schematic diagram of the optical lens provided in Embodiment 2 of the present application. Compared with Embodiment 1, the main difference is that the object side S1 of the first lens L1 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0141] The related parameters of each lens in the optical lens in Embodiment 2 are shown in Table 2-1.

[0142] Table 2-1

[0143]

[0144] The surface type parameters of the aspherical lens of the optical lens in Embodiment 2 are shown in Table 2-2.

[0145] Table 2-2

[0146]

[0147]

[0148] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 5 , Figure 6 respectively.

[0149] As can be seen from Figure 5 , the F-Tanθ distortion of the optical lens is controlled within 0-2%, and the image compression in the edge angle region is relatively flat, effectively improving the clarity of the expanded image.

[0150] As can be seen from Figure 6 , the MTF value of this embodiment is above 0.28 in the full field of view, and in the range of 0-300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency conditions.

[0151] Embodiment 3

[0152] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens provided in Embodiment 3 of the present application. Compared with Embodiment 1, the main difference is that the image side S2 of the first lens L1 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0153] The related parameters of each lens in the optical lens in Embodiment 3 are shown in Table 3-1.

[0154] Table 3-1

[0155]

[0156]

[0157] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 3 are shown in Table 3-2.

[0158] Table 3-2

[0159] Surface number K B C D E F S3 -5.41E+01 -1.00E-04 4.11E-07 -5.05E-09 1.40E-10 1.61E-13 S4 -2.00E+02 -1.32E-04 1.18E-06 -1.67E-08 3.49E-10 -1.53E-12 S5 -5.83E+00 2.33E-04 -4.76E-06 6.46E-08 -6.29E-10 -6.58E-12 S6 -8.83E+00 -1.77E-04 1.62E-06 -2.73E-08 2.13E-10 -8.42E-12 S12 -1.31E+01 -1.90E-03 5.95E-05 -2.50E-06 6.80E-08 -9.77E-10 S13 2.00E+02 -4.64E-04 -3.88E-06 1.23E-07 -6.50E-09 8.78E-11

[0160] In the present embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 8 , Figure 9 respectively.

[0161] As can be seen from Figure 5 , the F-Tanθ distortion of the optical lens is controlled within ±1%, and the image compression in the edge angle region is relatively gentle, effectively improving the definition of the expanded image.

[0162] As can be seen from Figure 6 , the MTF value of the present embodiment is above 0.25 in the full field of view, and in the range of 0-300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0163] Embodiment 4

[0164] Please refer to Figure 10 , which is a structural schematic diagram of the optical lens provided in Embodiment 4 of the present application. Compared with Embodiment 1, the main difference is that the object side S1 of the first lens L1 is a convex surface; the image side S4 of the second lens L2 is a concave surface; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0165] The related parameters of each lens in the optical lens in Embodiment 4 are shown in Table 4-1.

[0166] Table 4-1

[0167]

[0168]

[0169] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 4 are shown in Table 4-2.

[0170] Table 4-2

[0171] Surface number K B C D E F S3 -2.76E+01 -1.07E-04 -6.80E-07 -1.64E-08 2.17E-10 2.29E-13 S4 -2.00E+02 -1.60E-04 3.42E-07 -2.65E-08 4.36E-10 -1.58E-12 S5 -5.45E+00 2.33E-04 -4.98E-06 4.64E-08 -5.99E-11 -3.09E-11 S6 -8.90E+00 -1.78E-04 1.12E-06 -2.92E-08 2.72E-10 -2.58E-11 S12 -9.61E+00 -1.87E-03 5.56E-05 -2.50E-06 7.69E-08 -1.32E-09 S13 2.00E+02 -4.19E-04 -8.06E-06 2.03E-07 -8.52E-09 8.29E-11

[0172] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 11 , Figure 12 respectively.

[0173] As can be seen from Figure 11 , the F-Tanθ distortion of the optical lens is controlled within ±1%, and the image compression in the edge angle region is relatively gentle, effectively improving the definition of the unfolded image.

[0174] As can be seen from Figure 12 , the MTF value of the embodiment is above 0.25 in the full field of view, and in the range of 0-300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency conditions.

[0175] Embodiment 5

[0176] Please refer to Figure 13 , which is a structural schematic diagram of the optical lens provided in the embodiment 5 of the application, and the main difference between the embodiment and the embodiment 1 is that: the image side S2 of the first lens L1 is a convex surface; the object side S3 of the second lens L2 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0177] The related parameters of each lens in the optical lens in the embodiment 5 are shown in Table 5-1.

[0178] Table 5-1

[0179]

[0180]

[0181] The surface type parameters of the aspherical lens of the optical lens in the embodiment 5 are shown in Table 5-2.

[0182] Table 5-2

[0183] Surface number K B C D E F S3 1.92E+02 -7.71E-05 1.10E-06 -1.42E-09 1.12E-10 5.79E-13 S4 -3.95E+01 -1.45E-04 1.97E-06 -1.16E-08 1.86E-10 6.40E-13 S5 -5.21E+00 2.35E-04 -5.42E-06 4.93E-08 -7.72E-11 -2.53E-11 S6 -8.66E+00 -1.89E-04 1.08E-06 -4.27E-08 5.93E-10 -2.07E-11 S12 -1.18E+01 -1.89E-03 4.97E-05 -2.76E-06 9.91E-08 -2.04E-09 S13 2.00E+02 -5.45E-04 -1.15E-05 6.92E-08 -3.07E-09 -1.29E-11

[0184] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 14 , Figure 15 respectively.

[0185] As can be seen from Figure 14 , the F-Tanθ distortion of the optical lens is controlled within ±2%, and the image compression in the edge angle region is relatively gentle, effectively improving the definition of the unfolded image.

[0186] As can be seen from Figure 15As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0187] Example 6

[0188] Please see Figure 16 The figure shows a schematic diagram of the optical lens provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image-side surface S2 of the first lens L1 is convex and the image-side surface S6 of the third lens L3 is concave. The optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0189] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0190] Table 6-1

[0191]

[0192] The surface profile parameters of the aspherical lens in Example 6 are shown in Table 6-2.

[0193] Table 6-2

[0194]

[0195]

[0196] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 23 , Figure 24 As shown.

[0197] from Figure 23 As can be seen, the F-Tanθ distortion of the optical lens is controlled within ±3%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0198] from Figure 24 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0199] Example 7

[0200] Please see Figure 19The figure shows a schematic diagram of the optical lens provided in Embodiment 7 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side S2 of the first lens L1 is a convex surface; the object side S3 of the second lens L2 is a concave surface; the object side S5 of the third lens L3 is a concave surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0201] The relevant parameters of each lens in the optical lens of Example 7 are shown in Table 7-1.

[0202] Table 7-1

[0203]

[0204]

[0205] The surface profile parameters of the aspherical lens in Example 7 are shown in Table 7-2.

[0206] Table 7-2

[0207] Surface number K B C D E F S3 2.00E+02 -1.57E-04 -1.24E-06 -2.92E-09 4.99E-11 -1.07E-11 S4 -6.25E+01 -1.09E-04 2.09E-06 -3.42E-08 1.82E-10 -9.63E-12 S5 -2.00E+02 2.81E-04 -4.20E-06 1.04E-07 4.77E-10 -3.03E-11 S6 -4.21E+00 -2.49E-04 2.23E-06 -3.00E-09 1.52E-09 -2.02E-11 S12 -1.91E+01 -1.51E-03 6.48E-05 -3.09E-06 8.90E-08 -1.17E-09 S13 2.00E+02 5.84E-05 -1.27E-05 -4.28E-08 2.93E-09 -5.55E-11

[0208] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 20 , Figure 21 As shown.

[0209] from Figure 20 As can be seen, the F-Tanθ distortion of the optical lens is controlled within ±2%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0210] from Figure 21 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0211] Example 8

[0212] Please see Figure 22 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 8 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side S2 of the first lens L1 is a convex surface; the object side S3 of the second lens L2 is a concave surface; the object side S10 of the sixth lens L6 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0213] The relevant parameters of each lens in the optical lens of Example 8 are shown in Table 8-1.

[0214] Table 8-1

[0215]

[0216]

[0217] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 8 are shown in Table 8-2.

[0218] Table 8-2

[0219] Surface number K B C D E F S3 2.00E+02 -7.74E-05 9.98E-07 7.95E-09 -1.20E-11 3.09E-13 S4 -4.29E+01 -1.49E-04 2.00E-06 -7.50E-09 1.87E-10 -8.42E-13 S5 -4.27E+00 2.43E-04 -6.08E-06 1.38E-08 1.19E-09 -6.37E-11 S6 -9.21E+00 -2.09E-04 2.53E-07 -5.97E-08 9.78E-10 -3.74E-11 S12 -1.30E+01 -1.62E-03 4.89E-05 -2.73E-06 1.00E-07 -2.66E-09 S13 2.00E+02 -6.96E-04 -1.51E-05 -2.75E-08 -3.54E-09 -2.06E-10

[0220] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 23 , Figure 24 respectively.

[0221] As can be seen from Figure 23 , the F-Tanθ distortion of the optical lens is controlled within-5% to 0, the image compression in the edge angle region is relatively gentle, and the definition of the expanded image is effectively improved.

[0222] As can be seen from Figure 24 , the MTF value of this embodiment is above 0.2 in the full field of view, and in the range of 0-300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency conditions.

[0223] Embodiment 9

[0224] Please refer to Figure 25 , which is a structural schematic diagram of the optical lens provided in Embodiment 9 of the present application. Compared with Embodiment 1, the main difference is that: the image side S2 of the first lens L1 is a convex surface; the object side S3 of the second lens L2 is a concave surface; the object side S10 of the sixth lens L6 is a convex surface; the image side S11 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0225] The related parameters of each lens in the optical lens in Embodiment 9 are shown in Table 9-1.

[0226] Table 9-1

[0227]

[0228] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 9 are shown in Table 9-2.

[0229] Table 9-2

[0230] Surface number K B C D E F S3 2.00E+02 -7.69E-05 1.26E-06 1.04E-08 -4.84E-11 8.64E-13 S4 -4.58E+01 -1.43E-04 2.24E-06 -6.41E-09 2.07E-10 -5.64E-13 S5 -4.27E+00 2.42E-04 -5.83E-06 1.85E-08 1.30E-09 -6.23E-11 S6 -8.51E+00 -2.06E-04 4.77E-07 -5.24E-08 1.10E-09 -4.01E-11 S12 -1.71E+01 -1.98E-03 3.40E-05 -2.57E-06 1.08E-07 -3.88E-09 S13 1.17E+02 -1.16E-03 -1.16E-05 -3.08E-08 -1.04E-08 -2.53E-10

[0231] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 26 , Figure 27 respectively. As can be seen from Figure 26 , the F-Tanθ distortion of the optical lens is controlled within-3%~0, the image compression in the edge angle region is relatively gentle, and the definition of the unfolded image is effectively improved.

[0232] As can be seen from Figure 27 , the MTF value of the embodiment is above 0.3 in the full field of view, and the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view in the range of 0~300lp / mm, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0233] Embodiment 10

[0234] Please refer to Figure 28 , which is a structural schematic diagram of the optical lens provided in the embodiment 10 of the present application. Compared with the embodiment 1, the main difference is that: the image side S2 of the first lens L1 is a convex surface; the image side S4 of the second lens L2 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0235] The related parameters of each lens in the optical lens in the embodiment 10 are shown in Table 10-1.

[0236] Table 10-1

[0237]

[0238] The surface type parameters of the aspherical lens of the optical lens in the embodiment 10 are shown in Table 10-2.

[0239] Table 10-2

[0240] Surface number K B C D E F S3 -2.52E+01 -8.57E-05 8.87E-07 -2.04E-08 4.19E-10 -1.76E-12 S4 -1.37E+02 -1.39E-04 1.76E-06 -2.77E-08 4.91E-10 -1.84E-12 S5 -5.46E+00 2.39E-04 -5.24E-06 5.57E-08 1.21E-10 -2.10E-11 S6 -8.60E+00 -1.82E-04 1.44E-06 -2.56E-08 2.63E-10 -1.15E-11 S12 -1.36E+01 -1.82E-03 5.66E-05 -2.36E-06 6.54E-08 -1.04E-09 S13 2.00E+02 -5.99E-04 -2.50E-07 7.20E-08 -7.55E-09 1.05E-10

[0241] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 29 , Figure 30 respectively.

[0242] As can be seen from Figure 29 , the F-Tanθ distortion of the optical lens is controlled within ±2%, the image compression in the edge angle region is relatively gentle, and the definition of the unfolded image is effectively improved.

[0243] As can be seen from Figure 30It can be seen from the figure that the MTF value of the embodiment is above 0.2 in the full field of view, and in the range of 0-300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0244] Embodiment 11

[0245] Please refer to Figure 31 , which is a structural schematic diagram of the optical lens provided in Embodiment 11 of the application. Compared with Embodiment 1, the main difference is that the image side S2 of the first lens L1 is a convex surface; the object side S3 of the second lens L2 is a concave surface; the object side S5 of the third lens L3 is a concave surface; the object side S10 of the sixth lens L6 is a convex surface; the image side S11 of the sixth lens L6 is a concave surface; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0246] The related parameters of each lens in the optical lens in Embodiment 11 are shown in Table 11-1.

[0247] Table 11-1

[0248]

[0249]

[0250] The surface type parameters of the aspherical lens of the optical lens in Embodiment 11 are shown in Table 11-2.

[0251] Table 11-2

[0252] Surface number K B C D E F S3 2.00E+02 -9.23E-05 1.66E-06 -8.13E-09 8.66E-10 -1.04E-11 S4 -6.61E+01 -7.42E-05 3.79E-06 2.74E-09 -1.22E-11 1.02E-11 S5 1.74E+02 2.83E-04 -5.21E-06 7.85E-08 2.97E-09 1.21E-10 S6 -5.31E+00 -2.97E-04 3.65E-07 1.47E-08 4.90E-09 5.27E-11 S12 -1.64E+02 9.38E-05 3.66E-05 -2.67E-06 8.05E-08 -9.74E-10 S13 2.00E+02 1.40E-03 -1.92E-05 -1.60E-07 1.67E-08 -2.54E-10

[0253] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 32 , Figure 33 respectively.

[0254] It can be seen from Figure 32 that the F-Tanθ distortion of the optical lens is controlled within 0-4%, the image compression in the edge angle region is relatively flat, and the clarity of the unfolded image is effectively improved.

[0255] It can be seen from Figure 33 that the MTF value of the embodiment is above 0.19 in the full field of view, and in the range of 0-300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0256] Embodiment 12

[0257] Please refer to Figure 34 , which is a structural schematic diagram of the optical lens provided in Embodiment 12 of the present application. Compared with Embodiment 1, the main difference is that the image side S2 of the first lens L1 is a convex surface; the object side S10 of the sixth lens L6 is a convex surface; and the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0258] The related parameters of each lens in the optical lens in Embodiment 12 are shown in Table 12-1.

[0259] Table 12-1

[0260]

[0261]

[0262] The surface type parameters of the aspherical lens of the optical lens in Embodiment 12 are shown in Table 12-2.

[0263] Table 12-2

[0264] Surface number K B C D E F S3 -3.69E+01 -9.69E-05 8.32E-07 -1.37E-08 4.19E-10 -3.48E-12 S4 1.98E+02 -1.44E-04 1.71E-06 -2.52E-08 6.25E-10 -5.45E-12 S5 -4.07E+00 2.63E-04 -6.94E-06 1.42E-08 2.68E-09 -1.08E-10 S6 -9.28E+00 -2.01E-04 -8.25E-07 -1.48E-08 3.01E-10 -4.31E-11 S12 -9.13E+00 -1.66E-03 6.84E-05 -2.95E-06 7.75E-08 -1.54E-09 S13 2.00E+02 -7.80E-04 9.04E-06 -1.75E-07 -1.78E-08 2.91E-10

[0265] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 35 , Figure 36 respectively.

[0266] As can be seen from Figure 35 , the F-Tanθ distortion of the optical lens is controlled within -4% to 0, the image compression in the edge angle region is relatively gentle, and the clarity of the unfolded image is effectively improved.

[0267] As can be seen from Figure 36 , the MTF value of this embodiment is above 0.25 in the full field of view, and in the range of 0-300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency conditions.

[0268] Embodiment 13

[0269] Please refer to Figure 37 , which is a structural schematic diagram of the optical lens provided in Embodiment 13 of the present application. Compared with Embodiment 1, the main difference is that the fourth lens L4 and the fifth lens L5 are not cemented lenses; the image side S2 of the first lens L1 is a convex surface; the image side S4 of the second lens L2 is a concave surface; the object side S7 of the fourth lens L4 is a concave surface; the image side S8 of the fourth lens L4 is a convex surface; the object side S11 of the sixth lens L6 is a convex surface; the image side S12 of the sixth lens L6 is a concave surface; and the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0270] The related parameters of the lenses in the optical lens in Embodiment 13 are shown in Table 13-1.

[0271] Table 13-1

[0272]

[0273] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 13 are shown in Table 13-2.

[0274] Table 13-2

[0275]

[0276]

[0277] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figs. Figure 38 , Figure 39

[0278] As can be seen from Figs. Figure 38 , the F-Tanθ distortion of the optical lens is controlled within -2%~0, the image compression in the edge angle region is relatively gentle, and the definition of the expanded image is effectively improved.

[0279] As can be seen from Figs. Figure 39 , the MTF value of this embodiment is above 0.3 in the full field of view, and in the range of 0~300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0280] Embodiment 14

[0281] Please refer to Fig. Figure 40 , which is a structural schematic diagram of the optical lens provided in Embodiment 14 of the present application. Compared with Embodiment 1, the main difference is that: the fourth lens L4 and the fifth lens L5 are not cemented lenses; the image side surface S2 of the first lens L1 is a convex surface; the image side surface S4 of the second lens L2 is a concave surface; the image side surface S8 of the fourth lens L4 is a convex surface; the object side surface S11 of the sixth lens L6 is a convex surface; the image side surface S12 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0282] The related parameters of the lenses in the optical lens in Embodiment 14 are shown in Table 14-1.

[0283] Table 14-1

[0284] ​

[0285]

[0286] The surface profile parameters of the aspherical lens in the optical lens of Example 14 are shown in Table 14-2.

[0287] Table 14-2

[0288] Surface number K B C D E F S3 3.55E+00 -8.95E-05 2.42E-07 -6.02E-09 7.91E-11 -2.71E-13 S4 2.00E+02 -1.03E-04 1.51E-06 -1.89E-08 2.81E-10 -1.31E-12 S5 -4.77E+00 2.37E-04 -6.35E-06 5.62E-08 -3.73E-10 -2.46E-11 S6 -9.87E+00 -1.71E-04 7.00E-08 -5.81E-08 2.00E-09 -5.89E-11 S13 -1.27E+01 -3.07E-03 1.08E-04 -2.70E-06 3.42E-08 -2.25E-10 S14 2.00E+02 -1.58E-03 4.71E-05 -3.40E-07 -1.88E-08 3.93E-10

[0289] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 41 , Figure 42 As shown.

[0290] from Figure 41 As can be seen, the F-Tanθ distortion of the optical lens is controlled within ±1%, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0291] from Figure 42 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 300 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0292] Example 15

[0293] Please see Figure 43 The diagram shows a schematic of the optical lens provided in Embodiment 15 of the present invention. The main differences between this embodiment and Embodiment 1 are: the fourth lens L4 and the fifth lens L5 are not cemented lenses; the image-side surface S2 of the first lens L1 is convex; the image-side surface S4 of the second lens L2 is concave; the object-side surface S11 of the sixth lens L6 is convex; the image-side surface S12 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0294] The relevant parameters of each lens in the optical lens of Example 15 are shown in Table 15-1.

[0295] Table 15-1

[0296]

[0297]

[0298] The surface profile parameters of the aspherical lens in the optical lens of Example 15 are shown in Table 15-2.

[0299] Table 15-2

[0300] Surface number K B C D E F S3 3.40E+00 -8.98E-05 2.63E-07 -5.10E-09 8.48E-11 -7.20E-15 S4 2.00E+02 -9.69E-05 1.43E-06 -1.82E-08 3.25E-10 -9.88E-13 S5 -5.74E+00 2.21E-04 -5.58E-06 6.63E-08 -3.82E-10 -1.36E-11 S6 -9.81E+00 -1.75E-04 5.05E-07 -4.58E-08 2.15E-09 -5.25E-11 S13 -1.15E+01 -2.57E-03 8.79E-05 -2.65E-06 5.02E-08 -8.27E-10 S14 1.89E+02 -1.27E-03 3.38E-05 -3.01E-07 -1.69E-08 3.34E-10

[0301] In the present embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in FIGS. Figure 44 Figure 45

[0302] As can be seen from FIG. Figure 44 , the F-Tanθ distortion of the optical lens is controlled within ±1%, and the image compression in the edge angle region is relatively gentle, effectively improving the definition of the expanded image.

[0303] As can be seen from FIG. Figure 45 , the MTF value of the present embodiment is above 0.3 in the full field of view, and in the range of 0-300 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0304] Please refer to Table 16-1 and Table 16-2, which are the optical properties 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 chief ray angle CRA at the maximum image height, the maximum field of view angle FOV, and the numerical values corresponding to each conditional expression in each embodiment.

[0305] Table 16-1

[0306]

[0307]

[0308] Table 16-2

[0309]

[0310] In summary of the above embodiments, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of optical power, so that the lens has one or more advantages of long focal length, miniaturization, high resolution, and high imaging quality.

[0311] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" 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 described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. ​​

[0312] The above embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope 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, which 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, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, comprises successively: a first lens with negative refractive power; a second lens with positive refractive power; a third lens with positive refractive power; a fourth lens with positive refractive power; a fifth lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a sixth lens with positive refractive power; a seventh lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is convex; wherein the effective focal length f of the optical lens and the image side surface curvature radius R14 of the seventh lens satisfy: R14 / f<-3.6; the object side surface curvature radius R9 of the fifth lens and the image side surface curvature radius R10 of the fifth lens satisfy: 0.3<(R9-R10) / (R9+R10)<1.

2. The optical lens of claim 1, wherein, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 12.2°<FOV / Fno<15.3°.

3. The optical lens of claim 1, wherein, the real image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.2<IH / EPD<1.

9.

4. The optical lens of claim 1, wherein, the real image height IH corresponding to the maximum field of view of the optical lens and the radian θ of the maximum half field of view of the optical lens satisfy: 14.9mm<(IH / 2) / θ<23.8mm.

5. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the combined focal length f34567 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.7<f34567 / f<1.

7.

6. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the object side surface curvature radius R9 of the fifth lens satisfy: R9 / f>2.

3.

7. The optical lens of claim 1, wherein, the focal length f5 of the fifth lens and the object side surface curvature radius R9 of the fifth lens satisfy: R9 / f5<-3.

1.

8. The optical lens of claim 1, wherein, the focal length f7 of the seventh lens and the image side surface curvature radius R14 of the seventh lens satisfy: R14 / f7>2.

8.

9. The optical lens of claim 1, wherein, 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.

6.

10. The optical lens of claim 1, wherein, the object side surface sagittal height Sag9 of the fifth lens and the object side surface half-diameter of light d9 of the fifth lens satisfy: 0<Sag9 / d9<0.1; the image side surface sagittal height Sag14 of the seventh lens and the image side surface half-diameter of light d14 of the seventh lens satisfy: -0.3<Sag14 / d14<0.2.

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