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 object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has negative focal power; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; the seventh lens has negative focal power; wherein the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens meet the following formula:-1lt; (R7-R8) / (R7 + R8) lt; and-0.3. 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, 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 used more and more in intelligent driving, and the position of vehicle optical lenses in the automobile industry is continuously improved.

[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 focal power;

[0007] a second lens with positive focal power;

[0008] a third lens with positive focal power;

[0009] a fourth lens with positive focal power, whose object side surface is convex and whose image side surface is concave;

[0010] a fifth lens with negative focal power;

[0011] a sixth lens with positive focal power, whose object side surface is concave and whose image side surface is convex;

[0012] a seventh lens with negative focal power;

[0013] wherein the object side surface curvature radius R7 of the fourth lens and the image side surface curvature radius R8 of the fourth lens satisfy: -1<(R7-R8) / (R7+R8)<-0.3.

[0014] Further preferably, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 12.4°<FOV / Fno<15.8°.

[0015] It is further preferred that a real image height IH corresponding to a maximum field angle of the optical lens satisfies 1.3 < IH / EPD < 1.6, wherein EPD is an entrance pupil diameter of the optical lens.

[0016] It is further preferred that the real image height IH corresponding to the maximum field angle of the optical lens satisfies 14.9 mm < (IH / 2) / 0 < 22.8 mm, wherein 0 is an arc of a maximum half field angle of the optical lens.

[0017] It is further preferred that an effective focal length f of the optical lens satisfies R8 / f > 2.4, wherein R8 is an image-side surface radius of curvature of the fourth lens.

[0018] It is further preferred that the effective focal length f of the optical lens satisfies R11 / f < -1.4, wherein R11 is an object-side surface radius of curvature of the sixth lens.

[0019] It is further preferred that a focal length f4 of the fourth lens satisfies 1.5 < R8 / f4 < 4.7, wherein R8 is the image-side surface radius of curvature of the fourth lens.

[0020] It is further preferred that a focal length f6 of the sixth lens satisfies f6 / R11 < -0.4, wherein R11 is the object-side surface radius of curvature of the sixth lens.

[0021] It is further preferred that the object-side surface radius of curvature R11 of the sixth lens satisfies -0.1 < (R11-R12) / (R11+R12) < 0.7, wherein R12 is an image-side surface radius of curvature of the sixth lens.

[0022] It is further preferred that an image-side surface sagittal height Sag8 of the fourth lens satisfies 0 < Sag8 / d8 < 0.1, wherein d8 is an image-side surface diameter of the fourth lens; and an object-side surface sagittal height Sag11 of the sixth lens satisfies -0.1 < Sag11 / d11 < 0, wherein d11 is an image-side surface diameter of the sixth lens.

[0023] 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

[0024] 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:

[0025] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0026] Figure 2 F-Tanθ distortion curve diagram of the optical lens in the embodiment 1 of the present application.

[0027] Figure 3 MTF curve diagram of the optical lens in the embodiment 1 of the present application.

[0028] Figure 4 Structure schematic diagram of the optical lens in the embodiment 2 of the present application.

[0029] Figure 5 F-Tanθ distortion curve diagram of the optical lens in the embodiment 2 of the present application.

[0030] Figure 6 MTF curve diagram of the optical lens in the embodiment 2 of the present application.

[0031] Figure 7 Structure schematic diagram of the optical lens in the embodiment 3 of the present application.

[0032] Figure 8 F-Tanθ distortion curve diagram of the optical lens in the embodiment 3 of the present application.

[0033] Figure 9 MTF curve diagram of the optical lens in the embodiment 3 of the present application.

[0034] Figure 10 Structure schematic diagram of the optical lens in the embodiment 4 of the present application.

[0035] Figure 11 F-Tanθ distortion curve diagram of the optical lens in the embodiment 4 of the present application.

[0036] Figure 12 MTF curve diagram of the optical lens in the embodiment 4 of the present application.

[0037] Figure 13 Structure schematic diagram of the optical lens in the embodiment 5 of the present application.

[0038] Figure 14 F-Tanθ distortion curve diagram of the optical lens in the embodiment 5 of the present application.

[0039] Figure 15 MTF curve diagram of the optical lens in the embodiment 5 of the present application.

[0040] Figure 16 Structure schematic diagram of the optical lens in the embodiment 6 of the present application.

[0041] Figure 17 F-Tanθ distortion curve diagram of the optical lens in the embodiment 6 of the present application.

[0042] Figure 18 MTF curve of the optical lens in the embodiment 6 of the present application.

[0043] Figure 19 schematic structural diagram of the optical lens in the embodiment 7 of the present application.

[0044] Figure 20 F-Tanθ distortion curve of the optical lens in the embodiment 7 of the present application.

[0045] Figure 21 MTF curve of the optical lens in the embodiment 7 of the present application.

[0046] Figure 22 schematic structural diagram of the optical lens in the embodiment 8 of the present application.

[0047] Figure 23 F-Tanθ distortion curve of the optical lens in the embodiment 8 of the present application.

[0048] Figure 24 MTF curve of the optical lens in the embodiment 8 of the present application.

[0049] Figure 25 schematic structural diagram of the optical lens in the embodiment 9 of the present application.

[0050] Figure 26 F-Tanθ distortion curve of the optical lens in the embodiment 9 of the present application.

[0051] Figure 27 MTF curve of the optical lens in the embodiment 9 of the present application.

[0052] Figure 28 schematic structural diagram of the optical lens in the embodiment 10 of the present application.

[0053] Figure 29 F-Tanθ distortion curve of the optical lens in the embodiment 10 of the present application.

[0054] Figure 30 MTF curve of the optical lens in the embodiment 10 of the present application.

[0055] Figure 31 schematic structural diagram of the optical lens in the embodiment 11 of the present application.

[0056] Figure 32 F-Tanθ distortion curve of the optical lens in the embodiment 11 of the present application.

[0057] Figure 33 MTF curve of the optical lens in the embodiment 11 of the present application.

[0058] Figure 34A structure diagram of an optical lens in Embodiment 12 of the present application.

[0059] Figure 35 A F-Tanθ distortion curve diagram of the optical lens in Embodiment 12 of the present application.

[0060] Figure 36 An MTF curve diagram of the optical lens in Embodiment 12 of the present application.

[0061] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0062] 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 the detailed description is only a description of embodiments of the present application and does not limit the scope of the present application in any way. 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.

[0063] It should be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate 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.

[0064] 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.

[0065] In this context, 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.

[0066] It should also be understood that the words "comprise," "comprising," "include," "including," and / or "has," "having," 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 word "may" is used to mean "one or more embodiments of the present application." Also, the word "example" is used to mean "serving as an example, instance, or illustration." Thus, for example, when the word "example" is used in conjunction with "embodiment of the present application," the disclosure is not to be construed as being limited to that embodiment.

[0067] 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 overly literal or overly formal sense unless expressly so defined herein.

[0068] 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.

[0069] The optical lens provided by the embodiments 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.

[0070] The first lens can have a negative focal power, and the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex. The second lens can have a positive focal power, and the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex. The third lens can have a positive focal power, and the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex. The fourth lens can have a positive focal power, and the object side surface thereof is convex, and the image side surface thereof is concave. The fifth lens can have a negative focal power, and the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex. The sixth lens can have a positive focal power, and the object side surface thereof is concave, and the image side surface thereof is convex. The seventh lens can have a negative focal power, and the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex.

[0071] In some embodiments, the optical lens can further include 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 aberrations, 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 correction is facilitated.

[0072] In some embodiments, the optical lens can further include a filter and a protective glass, which are sequentially arranged between the seventh lens and the imaging surface along the optical axis. The filter is used to filter out interference light to prevent 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.

[0073] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -1 < (R7-R8) / (R7+R8) < -0.3. Satisfying the above range reasonably limits the shape of the object side surface and the image side surface of the fourth lens, which can control the fourth lens to have an appropriate surface type, reduce the generation of high-order aberrations, and reduce the difficulty of distortion correction of subsequent lenses. More specifically, -0.8 < (R7-R8) / (R7+R8) < -0.5.

[0074] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 12.4° < FOV / Fno < 15.8°. Satisfying the above range limits the optical lens to have a suitable field of view and aperture value, which can collect light at a large angle and obtain good imaging quality. More specifically, 13.7° < FOV / Fno < 14.5°.

[0075] 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: 1.3 < IH / EPD < 1.6. Satisfying the above range enables the optical lens to satisfy a large image surface, a large aperture, and sufficient image surface brightness in the edge field of view to prevent dark corner phenomenon, thereby improving the imaging quality. More specifically, 1.4 < IH / EPD < 1.6.

[0076] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the radian θ of the maximum half field angle of the optical lens satisfy: 14.9mm<(IH / 2) / θ<22.8mm. Satisfying the above range, the large image surface characteristic of the lens can be achieved, and high-definition imaging of the lens is achieved. More specifically, 16.5mm<(IH / 2) / θ<22mm.

[0077] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.4<R7 / f<1.5. The effective focal length f of the optical lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: R8 / f>2.4. Satisfying the above range, the shape of the object side surface and the image side surface of the fourth lens is reasonably limited, which is conducive to reducing the distortion generated by the front end lens, while reducing the difficulty of distortion correction of the rear end lens. More specifically, 0.53<R7 / f<1.37; 2.6<R8 / f<10.7.

[0078] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: R11 / f<-1.4. The effective focal length f of the optical lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -2.4<R12 / f<-0.6. Satisfying the above range, the shape of the object side surface and the image side surface of the sixth lens is reasonably limited, which is conducive to the correction of the aberration of the optical lens. More specifically, -5<R11 / f<-1.4; -2.2<R12 / f<-0.6.

[0079] In some embodiments, the focal length f4 of the fourth lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.3<R7 / f4<0.6. The focal length f4 of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 1.5<R8 / f4<4.7. Satisfying the above range, the ratio of the radius of curvature of the object side surface and the image side surface of the fourth lens to the focal length of the fourth lens is reasonably controlled, which is helpful to further optimize the astigmatism and field curvature, and reduce the difficulty of high-order aberration correction of the subsequent lens. More specifically, 0.4<R7 / f4<0.6; 1.6<R8 / f4<4.4.

[0080] In some embodiments, the focal length f6 of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: f6 / R11<-0.4. The focal length f6 of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: f6 / R12<-1.6. Satisfying the above range, by adjusting the surface shape of the object side surface and the image side surface of the sixth lens, it is conducive to strengthening the correction of high-order aberration. More specifically, f6 / R11<-0.49; f6 / R12<-1.8.

[0081] In some embodiments, the sixth lens has a radius of curvature R11 on the object side and a radius of curvature R12 on the image side, and the following condition is met: -0.1 < (R11-R12) / (R11+R12) < 0.7. By adjusting the radii of curvature of the object side and the image side of the sixth lens to meet the above range, the correction of high-order aberrations can be enhanced. More specifically, -0.1 < (R11-R12) / (R11+R12) < 0.6.

[0082] In some embodiments, the fourth lens has a sagittal height Sag8 of the half-field radius of the image side and a half-field radius d8 of the image side, and the following condition is met: 0 < Sag8 / d8 < 0.1; the sixth lens has a sagittal height Sag11 of the half-field radius of the object side and a half-field radius d11 of the image side, and the following condition is met: -0.1 < Sag11 / d11 < 0. By meeting the above ranges, various aberrations at the edge of the field of view of the optical lens can be effectively improved, and the imaging quality at the edge of the field of view of the optical lens can be improved. More specifically, 0 < Sag8 / d8 < 0.05; -0.09 < Sag11 / d11 < -0.01.

[0083] In some embodiments, the optical lens has an effective focal length f and an overall optical length TTL, and the following condition is met: 1.3 < TTL / f < 2.4. By meeting the above range, the overall length of the lens can be limited, and the long-focus performance of the system can be better achieved. More specifically, the optical lens has an effective focal length f and an overall optical length TTL, and the following condition is met: 1.5 < TTL / f < 2.3.

[0084] In some embodiments, the optical lens has an overall optical length TTL and a real image height IH corresponding to a maximum field of view angle, and the following condition is met: 2.2 < TTL / IH < 3.8. By meeting the above condition, a balance between a small volume and a large image surface of the optical lens can be achieved, so that the lens has a smaller overall length and a higher resolution. More specifically, 2.5 < TTL / IH < 3.6.

[0085] In some embodiments, the optical lens has an effective focal length f, a maximum field of view angle FOV, and a real image height IH corresponding to the maximum field of view angle, and the following condition is met: 0.9 < (IH / 2) / (f x tan(FOV / 2)) < 1.1. By meeting the above range, the size of distortion can be controlled, and the imaging quality of the optical lens can be improved. More specifically, 0.96 < (IH / 2) / (f x tan(FOV / 2)) < 1.06.

[0086] In some embodiments, the optical lens has an effective focal length f and a back focal length BFL, and the following condition is met: 0.1 < BFL / f < 0.2. By meeting the above range, the optical lens has a suitable back focus, the positions of the lenses can be reasonably arranged, and the difficulty of processing and assembly can be reduced. More specifically, 0.1 < BFL / f < 0.17.

[0087] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -6.2 < f1 / f < -1.3. Satisfying the above range, the first lens is defined to have appropriate negative refractive power, which helps the optical lens to collect large-angle light rays, helps to control distortion and reduce field curvature, thereby improving the geometric accuracy of the imaging surface. More specifically, -5.8 < f1 / f < -1.6.

[0088] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.8 < f2 / f < 7.3. 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, the light ray trend is more gentle, optimizes the aberration, and improves the resolution. More specifically, 2.1 < f2 / f < 6.8.

[0089] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.6 < f3 / f < 1.3. 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 < 1.2.

[0090] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.9 < f4 / f < 2.9. Satisfying the above range, the fourth lens is defined to have appropriate positive refractive power, which helps to make the light ray trend stable and improve the imaging quality. More specifically, 1.1 < f4 / f < 2.8.

[0091] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -2.3 < f5 / f < -0.4. Satisfying the above range, the fifth lens is defined to have appropriate negative refractive power, which helps to increase the imaging area and improve the imaging quality. More specifically, -2 < f5 / f < -0.6.

[0092] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f > 1.4. Satisfying the above range, the sixth lens is defined to have appropriate positive refractive power, which helps to reduce the aberration of the optical lens. More specifically, f6 / f > 1.5.

[0093] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -2.9 < f7 / f < -0.4. 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, -2.6 < f7 / f < -0.6.

[0094] 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 < 1.5. Satisfying the above range, the lens group after the stop of the optical lens has a suitable focal length, which can effectively correct the aberration generated by the lens group before the stop, and improve the imaging quality of the optical lens. More specifically, 0.8 < f34567 / f < 1.4.

[0095] In some embodiments, the total optical length TTL of the optical lens and the sum of the central thicknesses of the first lens to the seventh lens along the optical axis respectively ∑CT satisfy: 1.7 < TTL / ∑CT < 2.6. Satisfying the above range, reasonably configuring the total optical length of the optical lens and the sum of the thicknesses of the lenses helps to realize high-pixel characteristics and improve the imaging quality of the optical lens. More specifically, 1.7 < TTL / ∑CT < 2.4.

[0096] In some embodiments, the fourth lens and the fifth lens can be cemented to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to eccentricity, 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.

[0097] In some embodiments, the optical lens satisfies the condition: 15.8mm < f < 20.7mm, 32.8° < FOV < 34.6°, 6.5mm < EPD < 8.6mm, 31.4mm < TTL < 36.1mm, 2.3 < Fno < 2.5, 9.8mm < IH < 13mm, 15.1° < CRA < 29.6°, 2.2mm < BFL < 2.5mm, wherein 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 incidence angle at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments has at least the characteristics of long focal length and large image surface.

[0098] In some embodiments, the lens material in the optical lens provided by 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 characteristics of the glass. The optical lens provided by the present application can adopt a full-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0099] 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 the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving the miniaturization of the lens. More specifically, the second lens, the third lens, and the seventh lens in the optical lens provided by 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.

[0100] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0101]

[0102] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0103] The present application will be further described in the following embodiments. In various embodiments, 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.

[0104] Embodiment 1

[0105] Please refer to Figure 1 , which is a structure schematic diagram of the optical lens provided in the embodiment 1 of the present application. The optical lens sequentially includes 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 along the optical axis from the object side to the imaging surface.

[0106] The first lens L1 has negative focal power, and both the object side S1 and the image side S2 are concave surfaces.

[0107] The second lens L2 has positive focal power, and both the object side S3 and the image side S4 are convex surfaces.

[0108] The third lens L3 has positive focal power, and both the object side S5 and the image side S6 are convex surfaces.

[0109] The fourth lens L4 has positive focal power, and the object side S7 is a convex surface and the image side S8 is a concave surface.

[0110] The fifth lens L5 has negative focal power, and the object side S8 is a convex surface and the image side S9 is a concave surface.

[0111] 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.

[0112] The sixth lens L6 has positive focal power, and the object side S10 is a concave surface and the image side S11 is a convex surface.

[0113] The seventh lens L7 has negative focal power, and the object side S12 is a concave surface and the image side S13 is a convex surface.

[0114] The object side S14 and the image side S15 of the filter G1 are both flat surfaces.

[0115] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces.

[0116] The imaging surface S18 is a flat surface.

[0117] The first lens L1, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are glass spherical lenses, and the second lens L2, the third lens L3, and the seventh lens L7 are glass aspherical lenses.

[0118] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0119] Table 1-1

[0120]

[0121] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0122] Table 1-2

[0123] Face 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

[0124] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in FIGS. 1-1 and 1-2, respectively.Figure 2 , Figure 3 as shown in FIG. 2.

[0125] Figure 2 FIG. 1 shows the F-Tanθ distortion curve of the optical lens of the embodiment 1, which represents the F-Tanθ distortion of light rays at different image heights on the imaging plane, 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%, and the image compression in the edge angle region is relatively flat, effectively improving the clarity of the expanded image.

[0126] Figure 3 FIG. 1 shows the MTF (Modulation Transfer Function) curve of the optical lens of the embodiment 1, which represents the imaging modulation degree of the lens at different spatial frequencies in 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 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 both low and high frequency cases.

[0127] Embodiment 2

[0128] Please refer to Figure 4 , which is a structural schematic diagram of the optical lens provided in the embodiment 2 of the present application. Compared with the 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.

[0129] The related parameters of each lens in the optical lens in the embodiment 2 are shown in Table 2-1.

[0130] Table 2-1

[0131]

[0132]

[0133] The surface type parameters of the aspheric lens of the optical lens in the embodiment 2 are shown in Table 2-2.

[0134] Table 2-2

[0135] Face number K B C D E F S3 -9.57E+01 -1.08E-04 9.18E-08 -1.01E-08 1.58E-10 6.80E-13 S4 -2.00E+02 -1.28E-04 1.10E-06 -2.03E-08 3.42E-10 -5.44E-13 S5 -5.98E+00 2.35E-04 -4.42E-06 7.32E-08 -5.53E-10 -1.30E-11 S6 -8.05E+00 -1.82E-04 1.79E-06 -1.61E-08 3.40E-10 -1.66E-11 S12 -1.19E+01 -2.20E-03 5.53E-05 -2.43E-06 6.68E-08 -1.18E-09 S13 2.00E+02 -7.03E-04 -3.30E-06 4.23E-09 -5.63E-09 7.87E-11

[0136] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 5 , Figure 6 as shown in FIG. 2.

[0137] From Figure 5It can be seen from the F-Tanθ distortion curve of the optical lens in the embodiment that the F-Tanθ distortion of the optical lens is controlled within 0-2%, the image compression in the edge angle region is relatively gentle, and the definition of the unfolded image is effectively improved.

[0138] From Figure 6 It can be seen from the MTF curve of the optical lens in the embodiment that the MTF value of the optical lens is above 0.28 in the full field of view, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view in the range of 0-300 lp / mm, and the imaging quality and the detail resolution capability are good in the low-frequency and high-frequency cases.

[0139] Embodiment 3

[0140] Please refer to Figure 7 , which is a structure schematic diagram of the optical lens provided in the embodiment 3 of the present 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 optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0141] The related parameters of each lens in the optical lens in the embodiment 3 are shown in Table 3-1.

[0142] Table 3-1

[0143]

[0144] The surface type parameters of the aspheric lens of the optical lens in the embodiment 3 are shown in Table 3-2.

[0145] Table 3-2

[0146] Face 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

[0147] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 8 , Figure 9 respectively.

[0148] From Figure 5 It can be seen from the F-Tanθ distortion curve of the optical lens in the embodiment that the F-Tanθ distortion of the optical lens is controlled within ±1%, the image compression in the edge angle region is relatively gentle, and the definition of the unfolded image is effectively improved.

[0149] From Figure 6 It can be seen from the MTF curve of the optical lens in the embodiment that the MTF value of the optical lens is above 0.25 in the full field of view, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view in the range of 0-300 lp / mm, and the imaging quality and the detail resolution capability are good in the low-frequency and high-frequency cases.

[0150] Embodiment 4

[0151] Please refer to Figure 10The figure shows a schematic diagram of the optical lens provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 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 radius of curvature and lens thickness of each lens surface are different.

[0152] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0153] Table 4-1

[0154]

[0155] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0156] Table 4-2

[0157]

[0158]

[0159] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 11 , Figure 12 As shown.

[0160] from Figure 11 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.

[0161] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.25 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, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0162] Example 5

[0163] Please see Figure 13 The diagram shows a schematic of the optical lens provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the object-side surface S1 of the first lens L1 is convex; the object-side surface S3 of the second lens L2 is concave; the image-side surface S6 of the third lens L3 is concave; the object-side surface S12 of the seventh lens L7 is convex; the image-side surface S13 of the seventh lens L7 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0164] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0165] Table 5-1

[0166]

[0167]

[0168] The surface profile parameters of the aspherical lens of the optical lens in Example 5 are shown in Table 5-2.

[0169] Table 5-2

[0170] Face number K B C D E F S3 1.03E+02 -1.18E-04 1.94E-06 -1.57E-09 2.38E-10 -4.02E-12 S4 4.23E+01 -1.37E-04 3.48E-06 -2.31E-08 7.19E-10 -9.37E-12 S5 -2.62E+00 3.65E-04 -6.95E-06 6.94E-08 3.83E-09 -3.45E-10 S6 -2.00E+02 -2.72E-04 -8.42E-07 8.51E-08 -1.82E-09 -2.32E-10 S12 5.57E+01 -2.03E-03 -1.85E-05 -1.27E-06 -7.04E-08 3.59E-09 S13 -1.77E+01 -9.83E-04 -4.96E-05 2.14E-07 6.46E-08 -7.29E-10

[0171] In the present embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 14 , Figure 15 respectively.

[0172] 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 expanded image.

[0173] As can be seen from Figure 15 , the MTF value of the present 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 the case of low frequency and high frequency.

[0174] Example 6

[0175] Please refer to Figure 16 , which is a structural schematic diagram of the optical lens provided in Example 6 of the present application. Compared with Example 1, the main difference is that: the object side S12 of the seventh lens L7 is a convex surface; the image side S13 of the seventh lens L7 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0176] The related parameters of each lens in the optical lens in Example 6 are shown in Table 6-1.

[0177] Table 6-1

[0178]

[0179]

[0180] The surface profile parameters of the aspherical lens of the optical lens in Example 6 are shown in Table 6-2.

[0181] Table 6-2

[0182] Face number K B C D E F S3 -1.12E+01 -9.18E-05 3.68E-07 -2.65E-09 2.02E-11 1.06E-12 S4 -1.81E+02 -1.30E-04 1.67E-06 -2.15E-08 3.44E-10 -2.09E-12 S5 -6.52E+00 2.27E-04 -4.36E-06 7.42E-08 -9.52E-10 1.09E-12 S6 -7.90E+00 -1.84E-04 1.84E-06 -1.58E-08 -5.58E-11 -2.60E-12 S12 -2.00E+02 -2.03E-03 4.24E-05 -2.60E-06 6.20E-08 -8.31E-10 S13 -7.37E+01 -4.00E-04 -1.59E-05 -1.08E-07 -3.06E-09 6.45E-11

[0183] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 17 、 Figure 18 respectively.

[0184] As can be seen from Figure 17 , the F-Tanθ distortion of the optical lens is controlled within 0-6%, and the image compression in the edge angle region is relatively gentle, effectively improving the definition of the unfolded image.

[0185] As can be seen from Figure 18 , the MTF value of the embodiment is above 0.18 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 0-300 lp / mm, and has good imaging quality and good detail resolution ability in low and high frequency conditions.

[0186] Embodiment 7

[0187] Please refer to Figure 19 , which is a structural schematic diagram of the optical lens provided in the embodiment 7 of the 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, and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0188] The related parameters of each lens in the optical lens in the embodiment 7 are shown in Table 7-1.

[0189] Table 7-1

[0190]

[0191] The surface type parameters of the aspherical lens of the optical lens in the embodiment 7 are shown in Table 7-2.

[0192] Table 7-2

[0193] Face 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

[0194] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 20 、 Figure 21 respectively. As can be seen from Figure 20 , 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.

[0195] As can be seen from Figure 21As 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.

[0196] Example 8

[0197] Please see Figure 22 The figure shows a schematic diagram 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 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.

[0198] The relevant parameters of each lens in the optical lens of Example 8 are shown in Table 8-1.

[0199] Table 8-1

[0200]

[0201] The surface profile parameters of the aspherical lens in Example 8 are shown in Table 8-2.

[0202] Table 8-2

[0203] Face number K B C D E F S3 2.00E+02 -6.15E-05 2.57E-06 -6.30E-09 -2.26E-10 7.09E-12 S4 5.97E+01 -2.00E-04 6.55E-06 -9.04E-09 -2.24E-09 6.09E-11 S5 -3.53E+00 3.20E-04 -5.45E-06 8.83E-08 2.05E-09 -4.11E-11 S6 1.95E+02 -1.22E-04 1.17E-07 -5.37E-08 5.80E-09 -9.12E-11 S12 -7.75E+00 -2.75E-03 2.90E-05 -1.34E-06 3.24E-08 -1.85E-09 S13 2.00E+02 -1.79E-03 1.52E-06 4.53E-08 -8.58E-09 2.85E-11

[0204] 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.

[0205] 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.

[0206] 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.

[0207] Example 9

[0208] Please see Figure 25The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 9 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.

[0209] The relevant parameters of each lens in the optical lens of Example 9 are shown in Table 9-1.

[0210] Table 9-1

[0211]

[0212]

[0213] The surface profile parameters of the aspherical lens in the optical lens of Example 9 are shown in Table 9-2.

[0214] Table 9-2

[0215] Face 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

[0216] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 26 , Figure 27 As shown.

[0217] from Figure 26 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.

[0218] from Figure 27 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.

[0219] Example 10

[0220] Please see Figure 28 The figure shows a schematic diagram of the optical lens provided in Embodiment 10 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, the object side surface S3 of the second lens L2 is concave, and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0221] The relevant parameters of each lens in the optical lens of Example 10 are shown in Table 10-1.

[0222] Table 10-1

[0223]

[0224]

[0225] The surface profile parameters of the aspherical lens in the optical lens of Example 10 are shown in Table 10-2.

[0226] Table 10-2

[0227] Face 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

[0228] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 29 , Figure 30 As shown.

[0229] from Figure 29 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.

[0230] from Figure 30 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.

[0231] Example 11

[0232] Please see Figure 31 The figure shows a schematic diagram of the optical lens provided in Embodiment 11 of the present invention. The main difference between this embodiment and Embodiment 1 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 convex; the image-side surface S4 of the second lens L2 is concave; the object-side surface S9 of the fifth lens L5 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0233] The relevant parameters of each lens in the optical lens of Example 11 are shown in Table 11-1.

[0234] Table 11-1

[0235]

[0236] The surface profile parameters of the aspherical lens in the optical lens of Example 14 are shown in Table 14-2.

[0237] Table 14-2

[0238]

[0239]

[0240] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 32 , Figure 33 As shown.

[0241] from Figure 32 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.

[0242] from Figure 33 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, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0243] Example 12

[0244] Please see Figure 34 The diagram shows a schematic of the optical lens provided in Embodiment 12 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 object-side surface S1 of the first lens L1 is convex; the image-side surface S4 of the second lens L2 is concave; the object-side surface S9 of the fifth lens L5 is concave; the image-side surface S10 of the fifth lens L5 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0245] The relevant parameters of each lens in the optical lens of Example 12 are shown in Table 12-1.

[0246] Table 12-1

[0247]

[0248]

[0249] The surface profile parameters of the aspherical lens in the optical lens of Example 12 are shown in Table 12-2.

[0250] Table 12-2

[0251] Face number K B C D E F S3 3.33E+00 -8.80E-05 -3.01E-07 -2.19E-08 4.44E-10 -3.46E-12 S4 1.75E+02 -4.01E-05 8.81E-08 -3.72E-08 9.27E-10 -8.32E-12 S5 -4.39E+00 2.67E-04 -6.39E-06 -5.83E-08 2.80E-09 -2.43E-10 S6 -5.79E+00 -2.40E-04 -1.55E-06 -1.20E-07 1.09E-09 -1.24E-10 S13 -4.55E+00 -3.21E-03 1.08E-04 -1.75E-06 4.07E-08 -2.29E-09 S14 3.37E+01 -7.77E-04 4.46E-05 4.08E-08 -2.89E-08 6.83E-10

[0252] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 35 , Figure 36 As shown.

[0253] from Figure 35It can be seen that 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.

[0254] From Figure 36 It can be seen 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 ability in low frequency and high frequency.

[0255] Please refer to Table 13-1 and Table 13-2, 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.

[0256] Table 13-1

[0257]

[0258]

[0259] Table 13-2

[0260]

[0261]

[0262] 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.

[0263] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction 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.

[0264] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not 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, without departing from the concept of the present application, several modifications and improvements can be made, which are all within 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 surface along the optical axis, the optical lens comprises in sequence: 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, the object side surface of which is convex, and the image side surface of which is concave; a fifth lens with negative refractive power; a sixth lens with positive refractive power, the object side surface of which is concave, and the image side surface of which is convex; a seventh lens with negative refractive power; wherein the object side surface curvature radius R7 of the fourth lens and the image side surface curvature radius R8 of the fourth lens satisfy: -1<(R7-R8) / (R7+R8)<-0.

3.

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: 12.4°<FOV / Fno<15.8°.

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: 1.3<IH / EPD<1.

6.

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<22.8mm.

5. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the image side surface curvature radius R8 of the fourth lens satisfy: R8 / f>2.

4.

6. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the object side surface curvature radius R11 of the sixth lens satisfy: R11 / f<-1.

4.

7. The optical lens of claim 1, wherein, The focal length f4 of the fourth lens and the image side surface curvature radius R8 of the fourth lens satisfy: 1.5<R8 / f4<4.

7.

8. The optical lens of claim 1, wherein, The focal length f6 of the sixth lens and the object side surface curvature radius R11 of the sixth lens satisfy: f6 / R11<-0.

4.

9. The optical lens of claim 1, wherein, The object side surface curvature radius R11 of the sixth lens and the image side surface curvature radius R12 of the sixth lens satisfy: -0.1<(R11-R12) / (R11+R12)<0.

7.

10. The optical lens of claim 1, wherein, The image side surface sagittal height Sag8 of the fourth lens and the image side surface half-diameter d8 of the fourth lens satisfy: 0<Sag8 / d8<0.1; the object side surface sagittal height Sag11 of the sixth lens and the image side surface half-diameter d11 of the sixth lens satisfy: -0.1<Sag11 / d11<0.

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