Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface, the second lens has positive focal power; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has negative focal power; 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; -1.8,-20,-20; the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens meet the formula:-0.8 lt; (R1-R2) / (R1 + R2) lt; 0. 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 focal power, the object side surface of which is concave, and the image side surface of which is convex;

[0007] a second lens with positive focal power;

[0008] a third lens with positive focal power;

[0009] a fourth lens with positive focal power;

[0010] a fifth lens with negative focal power;

[0011] a sixth lens with positive focal power;

[0012] a seventh lens with negative focal 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<-1.8;

[0014] the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: -0.8<(R1-R2) / (R1+R2)<0.

[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: 12.4°<FOV / Fno<15.6°.

[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: 12.4°<FOV / Fno<15.6°.

[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: 12.4°<FOV / Fno<15.6°.

[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 an image-side surface curvature radius R2 of the first lens satisfy: R2 / f<-0.7.

[0020] It is further preferred that a focal length f7 of the seventh lens and an image-side surface curvature radius R14 of the seventh lens satisfy: 2.2<R14 / f7<13.8.

[0021] It is further preferred that a focal length f7 of the seventh lens and an image-side surface curvature radius R14 of the seventh lens satisfy: 2.2<R14 / f7<13.8.

[0022] It is further preferred that an image-side surface sagittal height Sag2 of the first lens and an image-side surface half-diameter d2 of the first lens satisfy: -0.3<Sag2 / d2<0.

[0023] It is further preferred that an optical total length TTL of the optical lens and a sum ∑CT of central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 1.5<TTL / ∑CT<2.5.

[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, small size, 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] Figure 46 Structure schematic diagram of the optical lens in embodiment 16 of the present application.

[0072] Figure 47 F-Tanθ distortion curve diagram of the optical lens in embodiment 16 of the present application.

[0073] Figure 48The MTF curve diagram of the optical lens in Embodiment 16 of the present application.

[0074] Figure 49 The structural diagram of the optical lens in Embodiment 17 of the present application.

[0075] Figure 50 The F-Tanθ distortion curve diagram of the optical lens in Embodiment 17 of the present application.

[0076] Figure 51 The MTF curve diagram of the optical lens in Embodiment 17 of the present application.

[0077] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0078] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are merely descriptive of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0079] It is to be noted that, in the present specification, the expressions first, second, third, etc. are used only to distinguish one feature from another feature, and do not 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.

[0080] 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.

[0081] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0082] It should also be understood that the use of the terms "have", "has", "having", "include", "includes" and / or "including" when used in this specification, specifies the presence of stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or groups thereof. In addition, when correlating terms such as "at least one of' appear after a listing of two or more items, that term replaces the individual items in the list with all possible combinations of the individual items including single implementation of at least one of the items. Moreover, when describing the embodiments of the present application, the use of "can" means "one or more embodiments of the present application". Also, the use of the term "exemplary", is intended to present an example or an illustration.

[0083] 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 idealized or formal sense unless expressly so defined herein.

[0084] 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.

[0085] 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.

[0086] In some embodiments, the first lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface. The second lens can have a positive focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The third lens can have a positive focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The fourth lens can have a positive focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The fifth lens can have a negative focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The sixth lens can have a positive focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface. The seventh lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface.

[0087] 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.

[0088] 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.

[0089] 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 <-1.8. Satisfying the above range defines the shape of the image side surface of the seventh lens, which helps to control the astigmatism and achieve high-pixel characteristics of the optical lens. More specifically, -12 < R14 / f < -1.9.

[0090] In some embodiments, the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: -0.8 < (R1-R2) / (R1+R2) < 0. Satisfying the above range can simultaneously reduce the angle between the incident light and the object side surface of the first lens, which serves the purpose of effectively reducing the working aperture of the first lens, and avoids the aperture of the rear end lens of the optical lens being too large due to light divergence. More specifically, -0.72 < (R1-R2) / (R1+R2) < -0.07.

[0091] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 12.4° < FOV / Fno < 15.6°. Satisfying the above range defines the optical lens to have a suitable field of view angle and aperture value, which can collect light at a large angle and obtain good imaging quality. More specifically, 13.7° < FOV / Fno < 14.5°.

[0092] In some embodiments, a real image height IH corresponding to a maximum field angle of the optical lens and an entrance pupil diameter EPD of the optical lens satisfy: 1.2 < IH / EPD < 1.7. Satisfying the above range allows the optical lens to satisfy a large image surface, a large aperture, and sufficient image surface brightness in an edge field of view, thereby preventing a dark corner phenomenon and improving imaging quality. More specifically, 1.3 < IH / EPD < 1.6.

[0093] In some embodiments, a real image height IH corresponding to a maximum field angle of the optical lens and an arc θ of a maximum half field angle of the optical lens satisfy: 16 mm < (IH / 2) / θ < 22 mm. Satisfying the above range allows the optical lens to have a large image surface and high-definition imaging. More specifically, 16.5 mm < (IH / 2) / θ < 20.3 mm.

[0094] In some embodiments, 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. Satisfying the above range allows the lens group after the stop of the optical lens to have a suitable focal length, which can effectively correct aberrations generated by the lens group before the stop and improve imaging quality of the optical lens. More specifically, 0.8 < f34567 / f < 1.6.

[0095] In some embodiments, an effective focal length f of the optical lens and a curvature radius R1 of the object side surface of the first lens satisfy: -2.3 < R1 / f < -0.7; and the effective focal length f of the optical lens and a curvature radius R2 of the image side surface of the first lens satisfy: R2 / f < -0.7. Satisfying the above conditions allows the light entering the first lens to have appropriate incident and exit angles by reasonably setting the surface shape of the first lens, which is conducive to reducing the outer diameter of the lens and maintaining the miniaturization of the system. More specifically, -2.1 < R1 / f < -0.7; -12 < R2 / f < -0.7.

[0096] In some embodiments, a focal length f7 of the seventh lens and a curvature radius R13 of the object side surface of the seventh lens satisfy: 0.4 < R13 / f7 < 0.6; and the focal length f7 of the seventh lens and a curvature radius R14 of the image side surface of the seventh lens satisfy: 2.2 < R14 / f7 < 13.8. Satisfying the above range allows the seventh lens to be a meniscus lens, which has a characteristic of correcting field curvature and is conducive to correcting aberrations of the entire optical lens. More specifically, 0.46 < R13 / f7 < 0.57; 2.23 < R14 / f7 < 12.67.

[0097] In some embodiments, the seventh lens has a radius of curvature R13 on the object side and a radius of curvature R14 on the image side, and the following condition is established: -1 < (R13-R14) / (R13+R14) < -0.6. The above condition reasonably limits the shape of the object side and the image side of the seventh lens, and can control the seventh lens to have a proper surface shape, effectively improve the field curvature and aberration, and improve the imaging quality. More specifically, -0.92 < (R13-R14) / (R13+R14) < -0.67.

[0098] In some embodiments, the first lens has a sagittal height Sag2 of the half-field radius of the image side and a half-field radius d2 of the image side, and the following condition is established: -0.3 < Sag2 / d2 < 0. The above condition controls the relationship between the sagittal height and the half-field radius of the image side of the first lens, which helps to control the light path and reduce the generation of aberration. More specifically, -0.2 < Sag2 / d2 < 0.

[0099] In some embodiments, the optical total 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 respectively satisfy: 1.5 < TTL / ∑CT < 2.5. The above condition reasonably configures the optical total length of the optical lens and the sum of the thicknesses of the lenses, which helps to achieve high-pixel characteristics and improve the imaging quality of the optical lens. More specifically, 1.5 < TTL / ∑CT < 2.4.

[0100] In some embodiments, the effective focal length f of the optical lens and the optical total length TTL satisfy: 1.3 < TTL / f < 2.2. The above condition helps to limit the total length of the lens while better achieving the long-focus performance of the system. More specifically, the effective focal length f of the optical lens and the optical total length TTL satisfy: 1.5 < TTL / f < 2.2.

[0101] In some embodiments, the optical total length TTL of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 2.3 < TTL / IH < 3.9. The above condition helps to achieve a balance between the small volume and the large image 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.

[0102] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view satisfy: 0.9 < (IH / 2) / (f x tan(FOV / 2)) < 1.1. The above condition 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.

[0103] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.11 < BFL / f < 0.2. Satisfying the above range, the optical lens is limited to have a suitable back focus, the positions of the lenses are reasonably arranged, and the processing and assembling difficulty is reduced.

[0104] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -11.1 < f1 / f < -1.5. Satisfying the above range, the first lens is limited to have a suitable negative focal length, which is helpful for the optical lens to collect large-angle light, control distortion and reduce field curvature, thereby improving the geometric accuracy of the imaging surface. More specifically, -10.1 < f1 / f < -1.6.

[0105] 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 < 4.9. Satisfying the above range, the second lens is limited to have a suitable positive focal length, which is conducive to the convergence of light, makes the divergent light entering the system from the front smoothly enter the rear optical system, the light trend is more gentle, the aberration is optimized, and the resolution is improved. More specifically, 1.9 < f2 / f < 4.5.

[0106] 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 < 1.4. Satisfying the above range, the third lens is limited to have a suitable positive focal length, 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.

[0107] 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 < 3.5. Satisfying the above range, the fourth lens is limited to have a suitable positive focal length, which is helpful for the light trend to be stable and improve the imaging quality. More specifically, 0.9 < f4 / f < 3.3.

[0108] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.3 < f5 / f < -0.5. Satisfying the above range, the fifth lens is limited to have a suitable negative focal length, which is helpful for increasing the imaging area and improving the imaging quality. More specifically, -1.2 < f5 / f < -0.5.

[0109] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 1.2 < f6 / f < 25.3. Satisfying the above range, the sixth lens is limited to have a suitable positive focal length, which is helpful for reducing the aberration of the optical lens. More specifically, 1.3 < f6 / f < 24.3.

[0110] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -3.2 < f7 / f < -0.6. Satisfying the above range, the seventh lens is defined to have a proper negative refractive power, which is beneficial to increase the imaging area of the optical lens, while the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens is improved. More specifically, -3 < f7 / f < -0.7.

[0111] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R13 of the object side surface of the seventh lens satisfy: -1.7 < R13 / f < -0.2. Satisfying the above range, the shape of the object side surface of the seventh lens is defined, which is helpful to reasonably control the light path, reduce the field curvature, and improve the imaging quality of the optical lens. More specifically, -1.6 < R13 / f < -0.3.

[0112] In some embodiments, the focal length f1 of the first lens and the radius of curvature R1 of the object side surface of the first lens satisfy: 0 < R1 / f1 < 0.7; and the focal length f1 of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 0 < R2 / f1 < 4.2. Satisfying the above range, by reasonably setting the surface shape of the first lens, the light entering the system can be effectively increased, and the imaging quality in bright and dark environments can be improved. More specifically, 0.06 < R1 / f1 < 0.67; 0.08 < R2 / f1 < 3.92.

[0113] 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 decentration, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; and 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.

[0114] In some embodiments, the optical lens satisfies the conditions: 16.6 mm < f < 19.9 mm, 32.8° < FOV < 34.6°, 6.9 mm < EPD < 8.3 mm, 31.4 mm < TTL < 36.1 mm, 2.3 < Fno < 2.5, 9.8 mm < IH < 12 mm, 16.3° < CRA < 33.5°, and 2.2 mm < BFL < 3.5 mm, where 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 incident angle of the chief ray 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 in the embodiments has at least the characteristics of long focal length and large image surface.

[0115] 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 itself. 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.

[0116] 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.

[0117] 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:

[0118]

[0119] 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.

[0120] 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 methods, and are included in the protection scope of the present application.

[0121] Embodiment 1

[0122] 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.

[0123] The first lens L1 has negative focal power, the object side S1 is a concave surface, and the image side S2 is a convex surface.

[0124] The second lens L2 has positive focal power, the object side S3 and the image side S4 are both convex surfaces.

[0125] The third lens L3 has positive focal power, the object side S5 and the image side S6 are both convex surfaces.

[0126] The fourth lens L4 has positive focal power, the object side S7 is a convex surface, and the image side S8 is a concave surface.

[0127] The fifth lens L5 has negative focal power, the object side S8 is a convex surface, and the image side S9 is a concave surface.

[0128] 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.

[0129] The sixth lens L6 has positive focal power, the object side S10 is a concave surface, and the image side S11 is a convex surface.

[0130] The seventh lens L7 has negative focal power, the object side S12 is a concave surface, and the image side S13 is a convex surface.

[0131] The object side S14 and the image side S15 of the filter G1 are both flat surfaces.

[0132] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces.

[0133] The imaging surface S18 is a flat surface.

[0134] 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.

[0135] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0136] Table 1-1

[0137]

[0138]

[0139] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0140] Table 1-2

[0141] Surface Number K B C D E F S3 -2.78E+01 -8.99E-05 1.04E-06 -1.72E-08 4.65E-10 -1.45E-12 S4 -2.00E+02 -1.33E-04 1.80E-06 -2.50E-08 5.33E-10 -1.55E-12 S5 -5.59E+00 2.37E-04 -5.21E-06 5.29E-08 -3.88E-11 -2.10E-11 S6 -8.77E+00 -1.84E-04 1.25E-06 -2.81E-08 2.38E-10 -1.32E-11 S12 -1.21E+01 -1.89E-03 5.62E-05 -2.36E-06 6.48E-08 -1.06E-09 S13 2.00E+02 -5.93E-04 -2.41E-06 6.40E-08 -7.37E-09 8.84E-11

[0142] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 2 , Figure 3 As shown.

[0143] Figure 2 The F-Tanθ distortion curve of Example 1 is shown, which represents the F-Tanθ distortion of light at different image heights on the imaging plane. The horizontal axis represents F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within ±1%, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image.

[0144] Figure 3 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of this example is above 0.2 throughout the entire field of view. Within the range of 0–300 lp / mm, the MTF curve decreases smoothly and uniformly from the center to the edge of the field of view, exhibiting good imaging quality and good detail resolution at both low and high frequencies.

[0145] Example 2

[0146] Please see Figure 4 The figure shows a schematic diagram of the optical lens provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side S4 of the second lens L2 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0147] The relevant parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0148] Table 2-1

[0149]

[0150] The surface profile parameters of the aspherical lens in Example 2 are shown in Table 2-2.

[0151] Table 2-2

[0152] 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

[0153] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 5 , Figure 6 As shown.

[0154] from Figure 5It can be seen from the F-Tanθ distortion curve of the optical lens that 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.

[0155] From Figure 6 It can be seen from the F-Tanθ distortion curve of the optical lens that 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.

[0156] Embodiment 3

[0157] 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 of the present embodiment is that 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 image side S11 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0158] The related parameters of each lens in the optical lens in Embodiment 3 are shown in Table 3-1.

[0159] Table 3-1

[0160]

[0161]

[0162] The surface type parameters of the aspherical lens of the optical lens in Embodiment 3 are shown in Table 3-2.

[0163] Table 3-2

[0164] Surface Number K B C D E F S3 2.43E+01 -6.19E-05 2.65E-06 -6.45E-09 4.39E-10 -1.01E-12 S4 -3.67E+01 -1.05E-04 2.95E-06 -1.52E-09 1.72E-10 4.02E-12 S5 -3.98E+00 2.69E-04 -5.27E-06 4.25E-08 -4.85E-10 -1.60E-11 S6 -1.13E+01 -1.75E-04 5.53E-07 -5.95E-08 1.68E-09 -4.68E-11 S12 -1.29E+01 -2.38E-03 4.62E-05 -2.09E-06 7.55E-08 -2.25E-09 S13 2.00E+02 -1.63E-03 2.26E-05 -5.71E-07 6.27E-09 -1.86E-10

[0165] 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.

[0166] From Figure 8 It can be seen from the F-Tanθ distortion curve of the optical lens that 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.

[0167] From Figure 9 It can be seen from the F-Tanθ distortion curve of the optical lens that 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.

[0168] Embodiment 4

[0169] 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 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, and the image side S11 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0170] The related parameters of each lens in the optical lens in Embodiment 4 are shown in Table 4-1.

[0171] Table 4-1

[0172]

[0173]

[0174] The surface type parameters of the aspherical lens of the optical lens in Embodiment 4 are shown in Table 4-2.

[0175] Table 4-2

[0176] 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

[0177] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 11 , Figure 12 respectively.

[0178] As can be seen from Figure 11 , the F-Tanθ distortion of the optical lens is controlled within 0-4%, and the image compression in the edge angle region is relatively flat, effectively improving the clarity of the expanded image.

[0179] As can be seen from Figure 12 , the MTF value of this 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 ability in low and high frequency conditions.

[0180] Embodiment 5

[0181] Please refer to Figure 13 , which is a structural schematic diagram of the optical lens provided in Embodiment 5 of the present application. Compared with Embodiment 1, the main difference is that the object side S10 of the sixth lens L6 is a convex surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0182] The related parameters of each lens in the optical lens in Embodiment 5 are shown in Table 5-1.

[0183] Table 5-1

[0184]

[0185] The surface type parameters of the aspheric lens of the optical lens in Embodiment 5 are shown in Table 5-2.

[0186] Table 5-2

[0187] 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

[0188] 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.

[0189] As can be seen from Figure 14 , the F-Tanθ distortion of the optical lens is controlled within-4%~0, the image compression in the edge angle region is relatively gentle, and the definition of the expanded image is effectively improved.

[0190] As can be seen from Figure 15 , the MTF value of the present embodiment is above 0.25 in the full field of view, and in the range of 0~300lp / 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.

[0191] Embodiment 6

[0192] Please refer to Figure 16 , which is a structural schematic diagram of the optical lens provided in Embodiment 6 of the present application, and the main difference between the present embodiment and Embodiment 1 is that: the image side surface S8 of the fourth lens L4 is a convex surface; the object side surface S8 of the fifth lens L5 is a concave surface; the object side surface S10 of the sixth lens L6 is a convex surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0193] The related parameters of each lens in the optical lens in Embodiment 6 are shown in Table 6-1.

[0194] Table 6-1

[0195]

[0196]

[0197] The surface type parameters of the aspheric lens of the optical lens in Embodiment 6 are shown in Table 6-2.

[0198] Table 6-2

[0199] Surface Number K B C D E F S3 -4.62E+00 -8.37E-05 2.62E-07 3.17E-09 9.86E-11 -8.54E-13 S4 -3.38E+01 -1.40E-04 2.04E-06 -1.84E-08 3.39E-10 -1.99E-12 S5 -1.14E+01 1.89E-04 -4.20E-06 8.33E-08 -8.87E-10 3.08E-12 S6 -1.13E+01 -1.85E-04 9.91E-07 -8.12E-09 6.73E-11 -9.87E-13 S12 -5.38E+00 -1.72E-03 6.70E-05 -2.43E-06 4.84E-08 -3.59E-10 S13 -3.40E+01 -3.61E-04 1.15E-05 -4.11E-07 4.31E-09 3.52E-11

[0200] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 17 , Figure 18 respectively.

[0201] As can be seen from Figure 17 , the F-Tanθ distortion of the optical lens is controlled within-3% to 0, the image compression in the edge angle region is relatively gentle, and the definition of the unfolded image is effectively improved.

[0202] As can be seen from Figure 18 , 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 the case of low frequency and high frequency.

[0203] Embodiment 7

[0204] Please refer to Figure 19 , which is a structural schematic diagram of the optical lens provided in the embodiment 7 of the application, and the main difference between the embodiment and the embodiment 1 is that 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 curvature radius and the lens thickness of each lens surface are different.

[0205] The related parameters of each lens in the optical lens in the embodiment 7 are shown in Table 7-1.

[0206] Table 7-1

[0207]

[0208]

[0209] The surface type parameters of the aspherical lens of the optical lens in the embodiment 7 are shown in Table 7-2.

[0210] Table 7-2

[0211] 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

[0212] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 20 , Figure 21 respectively.

[0213] As can be seen from Figure 20 , 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.

[0214] As can be seen from Figure 21 , the MTF value of the optical lens provided in 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 the imaging quality and the detail resolution capability are good in both low frequency and high frequency cases.

[0215] Embodiment 8

[0216] Please refer to Figure 22 , which is a structural schematic diagram of the optical lens provided in the embodiment 8 of the present application, and the main difference between the embodiment and the embodiment 1 is that 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 curvature radius and the lens thickness of each lens surface are different.

[0217] The related parameters of each lens in the optical lens in the embodiment 8 are shown in Table 8-1.

[0218] Table 8-1

[0219]

[0220]

[0221] The surface type parameters of the aspherical lens of the optical lens in the embodiment 8 are shown in Table 8-2.

[0222] Table 8-2

[0223] 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

[0224] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 23 and Figure 24 respectively.

[0225] 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 unfolded image is effectively improved.

[0226] As can be seen from Figure 24 , the MTF value of the optical lens provided in 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 the imaging quality and the detail resolution capability are good in both low frequency and high frequency cases.

[0227] Embodiment 9

[0228] Please refer to Figure 25The figure shows a schematic diagram of the optical lens provided in Embodiment 9 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S3 of the second lens L2 is concave; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0229] The relevant parameters of each lens in the optical lens of Example 9 are shown in Table 9-1.

[0230] Table 9-1

[0231]

[0232] The surface profile parameters of the aspherical lens in the optical lens of Example 9 are shown in Table 9-2.

[0233] Table 9-2

[0234]

[0235]

[0236] 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.

[0237] 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.

[0238] 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.

[0239] Example 10

[0240] 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 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.

[0241] The relevant parameters of each lens in the optical lens of Example 10 are shown in Table 10-1.

[0242] Table 10-1

[0243]

[0244]

[0245] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 10 are shown in Table 10-2.

[0246] Table 10-2

[0247] Surface 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

[0248] In the present embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 29 , Figure 30 respectively.

[0249] As can be seen from Figure 29 , the F-Tanθ distortion of the optical lens is controlled within -3% to 1%, the image compression in the edge angle region is relatively gentle, and the definition of the expanded image is effectively improved.

[0250] As can be seen from Figure 30 , the MTF value of the present embodiment is above 0.42 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.

[0251] Embodiment 11

[0252] Please refer to Figure 31 , which is a structural schematic diagram of the optical lens provided in Embodiment 11 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 S4 of the second lens L2 is a concave surface; the object side surface S7 of the fourth lens L4 is a concave surface; the image side surface S8 of the fourth lens L4 is a convex surface; the object side surface S9 of the fifth lens is a concave 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.

[0253] The related parameters of each lens in the optical lens in Embodiment 11 are shown in Table 11-1.

[0254] Table 11-1

[0255]

[0256]

[0257] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 11 are shown in Table 11-2.

[0258] Table 11-2

[0259] Surface Number K B C D E F S3 3.88E+00 -8.45E-05 3.60E-07 -5.06E-09 7.44E-11 -1.76E-13 S4 1.92E+01 -1.04E-04 1.60E-06 -1.81E-08 2.78E-10 -1.16E-12 S5 -5.14E+00 2.23E-04 -6.53E-06 5.45E-08 7.58E-11 -3.04E-11 S6 -1.22E+01 -1.63E-04 2.48E-07 -4.88E-08 1.51E-09 -4.45E-11 S13 -8.24E+00 -2.52E-03 1.03E-04 -2.62E-06 3.83E-08 -4.03E-10 S14 2.00E+02 -1.23E-03 5.04E-05 -4.44E-07 -1.79E-08 4.03E-10

[0260] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 32 、 Figure 33 respectively.

[0261] As shown in Figure 32 , the F-Tanθ distortion of the optical lens is controlled within-2% to 0, the image compression in the edge angle region is relatively gentle, and the definition of the expanded image is effectively improved.

[0262] As shown in Figure 33 , 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 0-300 lp / mm, and the imaging quality and the detail resolution capability are good in the low frequency and high frequency cases.

[0263] Embodiment 12

[0264] Please refer to Figure 34 , which is a structural schematic diagram of the optical lens provided in the embodiment 12 of the present application. Compared with the embodiment 1, the main difference is that the fourth lens L4 and the fifth lens L5 are not cemented lenses; 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 S9 of the fifth lens L5 is a concave surface; the image side S10 of the fifth lens L5 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; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0265] The related parameters of each lens in the optical lens in the embodiment 12 are shown in Table 12-1.

[0266] Table 12-1

[0267]

[0268] The surface type parameters of the aspherical lens of the optical lens in the embodiment 12 are shown in Table 12-2.

[0269] Table 12-2

[0270]

[0271]

[0272] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown inFigure 35 , Figure 36 As shown.

[0273] from Figure 35 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.

[0274] from Figure 36 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.

[0275] Example 13

[0276] Please see Figure 37 The diagram shows a schematic of the optical lens provided in Embodiment 13 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 S8 of the fourth lens L4 is convex; the object-side surface S9 of the fifth lens L5 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.

[0277] The relevant parameters of each lens in the optical lens of Example 13 are shown in Table 13-1.

[0278] Table 13-1

[0279]

[0280]

[0281] The surface profile parameters of the aspherical lens in the optical lens of Example 13 are shown in Table 13-2.

[0282] Table 13-2

[0283] Surface Number K B C D E F S3 3.49E+00 -8.72E-05 2.52E-07 -1.50E-08 -2.84E-12 1.74E-12 S4 -2.00E+02 -6.92E-05 7.95E-07 -2.75E-08 2.82E-10 -2.85E-13 S5 -4.78E+00 2.51E-04 -5.72E-06 3.73E-08 -6.46E-10 -3.61E-11 S6 -8.12E+00 -2.01E-04 -7.02E-07 -3.49E-08 -3.05E-10 -1.82E-11 S13 -9.18E+00 -2.74E-03 9.37E-05 -2.80E-06 4.18E-08 -9.00E-11 S14 1.13E+02 -7.58E-04 2.35E-05 -2.66E-07 -7.49E-09 2.08E-10

[0284] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 38 , Figure 39 As shown.

[0285] from Figure 38 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.

[0286] fromFigure 39 As can be seen from ,

[0287] Example 14

[0288] Please refer to Figure 40 , which is a structural schematic diagram of the optical lens provided in the embodiment 14 of the present application. Compared with the embodiment 1, the main difference of the embodiment 1 is that the fourth lens L4 and the fifth lens L5 are not cemented lenses; the image side S4 of the second lens L2 is a concave surface; the object side S9 of the fifth lens L5 is a concave surface; and the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0289] The related parameters of each lens in the optical lens in the embodiment 14 are shown in Table 14-1.

[0290] Table 14-1

[0291]

[0292]

[0293] The surface type parameters of the aspherical lens of the optical lens in the embodiment 14 are shown in Table 14-2.

[0294] Table 14-2

[0295] Surface Number K B C D E F S3 3.87E+00 -7.61E-05 -2.74E-07 -2.21E-08 4.45E-10 -4.14E-12 S4 1.89E+02 -4.62E-05 1.25E-07 -3.74E-08 8.73E-10 -8.74E-12 S5 -4.57E+00 2.67E-04 -6.22E-06 -4.71E-08 3.78E-09 -1.73E-10 S6 -6.58E+00 -2.25E-04 -8.69E-07 -9.75E-08 2.02E-09 -9.16E-11 S13 -6.51E+00 -2.77E-03 8.78E-05 -2.72E-06 3.83E-08 -1.35E-10 S14 2.00E+02 -7.55E-04 1.76E-05 1.45E-07 -2.31E-08 4.85E-10

[0296] In the embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 41 , Figure 42 respectively.

[0297] As can be seen from Figure 41 , the F-Tanθ distortion of the optical lens is controlled within ±1%, and the image compression in the edge angle region is relatively flat, which effectively improves the definition of the unfolded image.

[0298] As can be seen from Figure 42 , 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 the case of low frequency and high frequency.

[0299] Example 15

[0300] Please refer to Figure 43, as shown is a structural schematic view of the optical lens provided in embodiment 15 of the present application, 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 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; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0301] The related parameters of each lens in the optical lens in embodiment 15 are shown in table 15-1.

[0302] Table 15-1

[0303]

[0304] The surface type parameters of the aspherical lens of the optical lens in embodiment 15 are shown in table 15-2.

[0305] Table 15-2

[0306]

[0307]

[0308] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 44 , Figure 45 respectively.

[0309] As can be seen from Figure 44 , the F-Tanθ distortion of the optical lens is controlled within-2%~0, the image compression in the edge angle region is relatively flat, and the definition of the unfolded image is effectively improved.

[0310] As can be seen from Figure 45 , the MTF value of this embodiment is above 0.3 in the full field of view, and in the range of 0~300lp / 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.

[0311] Embodiment 16

[0312] Please refer to Figure 46The diagram shows a schematic of the optical lens provided in Embodiment 16 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 S4 of the second lens L2 is concave; the image-side surface S8 of the fourth lens L4 is convex; 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.

[0313] The relevant parameters of each lens in the optical lens of Example 16 are shown in Table 16-1.

[0314] Table 16-1

[0315]

[0316]

[0317] The surface profile parameters of the aspherical lens in the optical lens of Example 16 are shown in Table 16-2.

[0318] Table 16-2

[0319] 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

[0320] In this embodiment, the F-Tanθ distortion curve and MTF curve of the optical lens are respectively as follows: Figure 47 , Figure 48 As shown.

[0321] from Figure 47 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.

[0322] from Figure 48 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.

[0323] Example 17

[0324] Please see Figure 49 The figure shows a schematic diagram of the optical lens provided in Embodiment 17 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 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.

[0325] The related parameters of each lens in the optical lens in embodiment 17 are shown in Table 17-1.

[0326] Table 17-1

[0327]

[0328]

[0329] The surface type parameters of the aspherical lens of the optical lens in embodiment 17 are shown in Table 17-2.

[0330] Table 17-2

[0331] 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

[0332] In this embodiment, the F-Tanθ distortion curve and the MTF curve of the optical lens are shown in Figure 49 、 Figure 50 respectively.

[0333] As can be seen from Figure 50 , the F-Tanθ distortion of the optical lens is controlled within ±1%, and the image compression in the edge angle region is relatively flat, effectively improving the clarity of the unfolded image.

[0334] As can be seen from Figure 51 , 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 low and high frequency conditions.

[0335] Please refer to Table 18-1 and Table 18-2 for 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 of incidence CRA at the maximum image height, the maximum field of view angle FOV, and the numerical values corresponding to each condition in each embodiment.

[0336] Table 18-1

[0337]

[0338] Table 18-2

[0339]

[0340]

[0341] In summary, 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 reasonably configuring each lens surface and reasonably matching the optical power, so that the lens has one or more advantages of long focal length, miniaturization, high resolution, and high imaging quality.

[0342] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean 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.

[0343] The above-described 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 those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An optical lens comprising seven lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: The first lens with negative optical power has a concave object side and a convex image side. A second lens with positive optical power; A third lens with positive optical power; A fourth lens with positive optical power; A fifth lens with negative optical power; A sixth lens with positive optical power; The seventh lens with negative optical power has a concave object side and a convex image side. Wherein, the effective focal length f of the optical lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: R14 / f < -1.8; The object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy: -0.8<(R1-R2) / (R1+R2)<0.

2. The optical lens according to claim 1, characterized in that, The maximum field of view (FOV) of the optical lens and the aperture value (Fno) of the optical lens satisfy: 12.4° <FOV / Fno<15.6°。 3. The optical lens according to claim 1, characterized in that, The true 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<1.7。 4. The optical lens according to claim 1, characterized in that, The true 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: 16mm < (IH / 2) / θ < 22mm.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the combined focal length f34567 of the third lens, fourth lens, fifth lens, sixth lens and seventh lens satisfy: 0.7 <f34567 / f<1.7。 6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the radius of curvature R2 of the image side surface of the first lens satisfy the condition: R2 / f < -0.

7.

7. The optical lens according to claim 1, characterized in that, The focal length f7 of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: 2.2 <R14 / f7<13.8。 8. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R13 and the image-side radius of curvature R14 of the seventh lens satisfy the following condition: -1 < (R13 - R14) / (R13 + R14) < -0.

6.

9. The optical lens according to claim 1, characterized in that, The image-side aperture half-aperture sagitta Sag2 of the first lens satisfies -0.3 with respect to the image-side aperture half-aperture d2 of the first lens. <Sag2 / d2<0。 10. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the sum of the center thicknesses along the optical axis of the first lens to the seventh lens, ∑CT, satisfy: 1.5 <TTL / ∑CT<2.5。

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