Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a convex surface and the image side surface of the first lens is a concave surface; a second lens with negative optical power, wherein the object side surface of the second lens is a concave surface and the image side surface of the second lens is a convex surface; a third lens with positive optical power, wherein the object side surface of the third lens is a concave surface and the image side surface of the third lens is a convex surface; a fourth lens with negative optical power, wherein the object side surface of the fourth lens is a concave surface and the image side surface of the fourth lens is a convex surface; a fifth lens with positive optical power, wherein the object side surface of the fifth lens is a convex surface and the image side surface of the fifth lens is a convex surface; a sixth lens with negative optical power, wherein the object side surface of the sixth lens is a concave surface and the image side surface of the sixth lens is a concave surface; and a seventh lens with positive optical power, wherein the object side surface of the seventh lens is a convex surface. The optical lens provided by the application has one or more advantages such as a large target surface, a large aperture, an ultra-wide angle and the like.

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. In addition to the requirements of optical lenses for the existing ADAS system, such as light and thin shape, high pixel, high resolution and other characteristics, the optical lens is also required to be able to clearly image under low illumination conditions, so it is necessary to develop an optical lens with good imaging effect. SUMMARY

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

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

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

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

[0008] The second lens with negative focal power, the object side surface is concave, and the image side surface is convex;

[0009] The third lens with positive focal power, the object side surface is concave, and the image side surface is convex;

[0010] The fourth lens with negative focal power, the object side surface is concave, and the image side surface is convex;

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

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

[0013] The seventh lens with positive focal power, the object side surface is convex;

[0014] Wherein, the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: 0.7<(R5-R6) / (R5+R6)<1.

[0015] Further preferably, a real image height IH corresponding to a maximum field of view angle of the optical lens, an effective focal length f of the optical lens and a maximum field of view angle FOV of the optical lens satisfy: 0.4 < (IH / 2) / (f x Tan(FOV / 2)) < 0.55; a combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2 < f4567 / f < 18.

[0016] Further preferably, a maximum field of view angle FOV of the optical lens and an aperture value Fno of the optical lens satisfy: 72° < FOV / Fno < 81°; a real image height IH corresponding to a maximum field of view angle of the optical lens and an entrance pupil diameter EPD of the optical lens satisfy: 3.9 < IH / EPD < 4.4.

[0017] Further preferably, a real image height IH corresponding to a maximum field of view angle of the optical lens and an effective focal length f of the optical lens satisfy: 2.3 < IH / f < 2.4; a back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 1.2 < BFL / f < 1.5.

[0018] Further preferably, a focal length f2 of the second lens and an effective focal length f of the optical lens satisfy: -141 < f2 / f < -11; an object side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: -3.3 < R3 / f < -2.2; an image side surface curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -5.1 < R4 / f < -2.7.

[0019] Further preferably, a focal length f3 of the third lens and an effective focal length f of the optical lens satisfy: 1.8 < f3 / f < 6.5; an object side surface curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: -87 < R5 / f < -9; an image side surface curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: -6 < R6 / f < -1.

[0020] Further preferably, a focal length f4 of the fourth lens and an effective focal length f of the optical lens satisfy: -181 < f4 / f < -9.5; an object side surface curvature radius R7 of the fourth lens and the effective focal length f of the optical lens satisfy: -4.8 < R7 / f < -0.75; an image side surface curvature radius R8 of the fourth lens and the effective focal length f of the optical lens satisfy: -10 < R8 / f < -0.8.

[0021] It is further preferred that the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: -0.3 < (R3-R4) / (R3+R4) < -0.1; and the object side surface curvature radius R7 of the fourth lens and the image side surface curvature radius R8 of the fourth lens satisfy: -0.5 < (R7-R8) / (R7+R8) < 0.

[0022] It is further preferred that the image side surface half field radius sag4 of the second lens and the image side surface half field radius d4 of the second lens satisfy: -0.23 < sag4 / d4 < -0.09; and the object side surface half field radius sag5 of the third lens and the object side surface half field radius d5 of the third lens satisfy: -0.14 < sag5 / d5 < 0.

[0023] It is further preferred that the object side surface curvature radius R3 of the second lens, the image side surface curvature radius R4 of the second lens and the central thickness CT2 of the second lens satisfy: 0.3 < (R3+CT2) / R4 < 0.5; and the object side surface curvature radius R5 of the third lens, the image side surface curvature radius R6 of the third lens and the central thickness CT3 of the third lens satisfy: 7 < (R5+CT3) / R6 < 23.

[0024] The optical lens provided by the present application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages such as a large target surface, a large aperture, an ultra-wide angle, etc. BRIEF DESCRIPTION OF DRAWINGS

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

[0026] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0027] Figure 2 FIG. 2 is an F-Tan(Theta) distortion curve diagram of the optical lens according to the embodiment 1 of the present application.

[0028] Figure 3 FIG. 3 is an MTF curve diagram of the optical lens according to the embodiment 1 of the present application.

[0029] Figure 4 FIG. 4 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0030] Figure 5 FIG. 5 is an F-Tan(Theta) distortion curve diagram of the optical lens according to the embodiment 2 of the present application.

[0031] Figure 6 MTF curve of the optical lens in embodiment 2 of the present application.

[0032] Figure 7 Structure diagram of the optical lens in embodiment 3 of the present application.

[0033] Figure 8 F-Tan(Theta) distortion curve of the optical lens in embodiment 3 of the present application.

[0034] Figure 9 MTF curve of the optical lens in embodiment 3 of the present application.

[0035] Figure 10 Structure diagram of the optical lens in embodiment 4 of the present application.

[0036] Figure 11 F-Tan(Theta) distortion curve of the optical lens in embodiment 4 of the present application.

[0037] Figure 12 MTF curve of the optical lens in embodiment 4 of the present application.

[0038] Figure 13 Structure diagram of the optical lens in embodiment 5 of the present application.

[0039] Figure 14 F-Tan(Theta) distortion curve of the optical lens in embodiment 5 of the present application.

[0040] Figure 15 MTF curve of the optical lens in embodiment 5 of the present application.

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

[0042] Figure 17 F-Tan(Theta) distortion curve of the optical lens in embodiment 6 of the present application.

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

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

[0045] Figure 20 F-Tan(Theta) distortion curve of the optical lens in embodiment 7 of the present application.

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

[0047] Figure 22 The structural diagram of the optical lens in Embodiment 8 of the present application.

[0048] Figure 23 The F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 8 of the present application.

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

[0050] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0051] 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.

[0052] It is to be noted that, in the present specification, the expressions first, second, third, etc. are used only to distinguish one feature from another feature, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0053] 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 strictly to scale.

[0054] 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.

[0055] 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 referring to a list of items, e.g., such as "at least one of X, Y, and Z" the phrases "at least one of" is used to indicate that X, Y, and / or Z can be included in the list, but not only X, Y, and / or Z. Further, when describing 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.

[0056] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0057] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0058] 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.

[0059] In some embodiments, the first lens can have a negative focal power, the object side surface thereof can be a convex surface, and the image side surface thereof can be a concave surface. The second lens can have a negative focal power, the object side surface thereof can be a concave surface, and the image side surface thereof can be a convex surface. The third lens can have a positive focal power, the object side surface thereof can be a concave surface, and the image side surface thereof can be a convex surface. The fourth lens can have a negative focal power, the object side surface thereof can be a concave surface, and the image side surface thereof can be a convex surface. The fifth lens can have a positive focal power, the object side surface thereof can be a convex surface, and the image side surface thereof can be a convex surface. The sixth lens can have a negative focal power, the object side surface thereof can be a concave surface, and the image side surface thereof can be a concave surface. The seventh lens can have a positive focal power, the object side surface thereof can be a convex surface, and the image side surface thereof can be a concave surface or a convex surface.

[0060] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the third lens and the fourth lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. When the diaphragm is located between the third lens and the fourth lens, the correction of the diaphragm aberration is facilitated.

[0061] In some embodiments, the optical lens can further include a filter and a protective glass arranged in sequence between the seventh lens and the imaging surface along the optical axis. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass serves to protect 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.

[0062] In some embodiments, the fifth lens and the sixth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; 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.

[0063] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.7 < (R5-R6) / (R5+R6) < 1. Satisfying the above range reduces the correction difficulty of the subsequent lens spherical aberration and chromatic aberration; at the same time, it is beneficial to the smoothness of the light path, and as many edge field beams as possible are transmitted to the rear end of the optical lens to improve the relative luminance of the optical lens. More specifically: 0.75 < (R5-R6) / (R5+R6) < 0.93.

[0064] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.4 < (IH / 2) / (f x Tan(FOV / 2)) < 0.55; the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2 < f4567 / f < 18. Satisfying the above range can control the optical lens to have small distortion and improve the imaging quality of the optical lens. At the same time, the rear lens group has appropriate positive refractive power, which can effectively transmit more light beams to the imaging surface, further improving the imaging quality. More specifically: 0.42 < (IH / 2) / (f x Tan(FOV / 2)) < 0.53; 2.03 < f4567 / f < 17.7.

[0065] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 72° < FOV / Fno < 81°; 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: 3.9 < IH / EPD < 4.4. Satisfying the above range, the ratio of the field of view and the aperture value is reasonably limited, which can collect light rays of a large angle and obtain good imaging quality. At the same time, reasonably limiting the ratio of the image height and the entrance pupil diameter is beneficial to increase the light throughput, so that the brightness of the peripheral field of view and the central field of view is more uniform. More specifically: 72.96° < FOV / Fno < 80.01°; 3.95 < IH / EPD < 4.4.

[0066] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2.3 < IH / f < 2.4; the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 1.2 < BFL / f < 1.5. Satisfying the above range, the image height and the focal length of the optical lens are reasonably controlled within a reasonable range, which helps the optical lens to have a large image surface characteristic. At the same time, limiting the optical lens to have a suitable back focus facilitates the reasonable arrangement of the positions of the lenses, while reducing the processing and assembly difficulty. More specifically: 2.3 < IH / f < 2.39; 1.23 < BFL / f < 1.47.

[0067] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -141 < f2 / f < -11; the object side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: -3.3 < R3 / f < -2.2; the image side surface curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -5.1 < R4 / f < -2.7. Satisfying the above range, by reasonably limiting the relative proportion of the focal power of the second lens and the surface shape thereof, it is beneficial to realize a larger light intake and increase the relative luminance. More specifically: -140.3 < f2 / f < -11.7; -3.2 < R3 / f < -2.23; -5.04 < R4 / f < -2.76.

[0068] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.8 < f3 / f < 6.5; the radius of curvature R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: -87 < R5 / f < -9; the radius of curvature R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: -6 < R6 / f < -1. By reasonably limiting the power ratio and the surface shape of the third lens, the aberration generated at the front end of the lens can be effectively corrected, and the imaging quality of the lens is improved. More specifically, 1.8 < f3 / f < 6.31; -86.75 < R5 / f < -9.94; -5.84 < R6 / f < -1.07.

[0069] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -181 < f4 / f < -9.5; the radius of curvature R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: -4.8 < R7 / f < -0.75; the radius of curvature R8 of the image side surface of the fourth lens and the effective focal length f of the optical lens satisfy: -10 < R8 / f < -0.8. By reasonably limiting the power ratio and the surface shape of the fourth lens, the imaging area is increased, and the imaging quality is improved. More specifically, -180.2 < f4 / f < -9.67; -4.74 < R7 / f < -0.79; -9.95 < R8 / f < -0.84.

[0070] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -0.3 < (R3-R4) / (R3+R4) < -0.1; the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -0.5 < (R7-R8) / (R7+R8) < 0. By controlling the surface shape of the second lens and the fourth lens to satisfy the above range, the aberration of the optical lens can be effectively corrected. More specifically, -0.27 < (R3-R4) / (R3+R4) < -0.1; -0.45 < (R7-R8) / (R7+R8) < -0.02.

[0071] In some embodiments, the sagittal height Sag4 of the image side surface of the second lens and the half-diameter d4 of the image side surface of the second lens satisfy: -0.23 < Sag4 / d4 < -0.09; the sagittal height Sag5 of the object side surface of the third lens and the half-diameter d5 of the object side surface of the third lens satisfy: -0.14 < Sag5 / d5 < 0. By satisfying the above range, the light path can be controlled, and the detail information of the central field of view of the optical lens is highlighted.

[0072] In some embodiments, the object-side surface curvature radius R3 of the second lens, the image-side surface curvature radius R4 of the second lens and the central thickness CT2 of the second lens satisfy: 0.3<(R3+CT2) / R4<0.5; the object-side surface curvature radius R5 of the third lens, the image-side surface curvature radius R6 of the third lens and the central thickness CT3 of the third lens satisfy: 7<(R5+CT3) / R6<23. Satisfying the above ranges, the curvature radius and the central thickness jointly affect the shape of the lens, control the shape of the second lens and the third lens within a reasonable range, can reduce the correction difficulty of the edge field distortion, control the distortion within a reasonable range, and is beneficial to improve the yield of manufacturing the lens. More specifically: 0.31<(R3+CT2) / R4<0.47; 7.37<(R5+CT3) / R6<22.71.

[0073] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 7.2<TTL / f<8.3. Satisfying the above range is beneficial to limit the total length of the lens and realize miniaturization. More specifically: 7.21<TTL / f<8.23.

[0074] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 3<TTL / IH<3.5. Satisfying the above range ensures that when the lens is used for wide-angle shooting, the total length is still within a reasonable range. More specifically: 3.07<TTL / IH<3.47.

[0075] In some embodiments, the sum ΣCT of the central thicknesses of the first lens to the seventh lens along the optical axis and the total optical length TTL of the optical lens satisfy: 0.45<ΣCT / TTL<0.65. Satisfying the above range controls the total optical length of the optical lens and the sum of the central thicknesses of the lenses within a reasonable range, which is helpful to realize high-pixel characteristics and improve the imaging quality of the optical lens. More specifically: 0.48<ΣCT / TTL<0.6.

[0076] In some embodiments, the sum ΣCT of the central thicknesses of the first lens to the seventh lens along the optical axis and the effective focal length f of the optical lens satisfy: 3.5<ΣCT / f<5. Satisfying the above range controls the effective focal length of the optical lens and the sum of the central thicknesses of the lenses within a reasonable range, making the lens more compact. More specifically: 3.54<ΣCT / f<4.9.

[0077] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.5 < f1 / f < -1.9. Satisfying the above range, the first lens is defined to have proper negative refractive power, has a diverging effect on the light passing therethrough, and is beneficial to realize a small front end diameter. More specifically: -2.44 < f1 / f < -1.94.

[0078] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1 < f5 / f < 2.1. Satisfying the above range, the fifth lens is defined to have proper positive refractive power, which is beneficial to light convergence. And the cooperation of the fifth lens with positive refractive power and the sixth lens with negative refractive power can adjust the optical path difference between different fields of view, improve resolution, is beneficial to make the light enter the rear lens gently, further reduce the field curvature, and correct the off-axis point aberration of the optical lens. More specifically: 1.02 < f5 / f < 2.01.

[0079] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.5 < f6 / f < -0.9. Satisfying the above range, the sixth lens is defined to have proper negative refractive power, which can diverge the light emitted by the fifth lens, make the light of the edge field have an upward trend, is beneficial to make the image points on the imaging surface away from the optical axis, to realize the effect of matching with a large chip, and obtain a larger picture. More specifically: -1.48 < f6 / f < -0.94.

[0080] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 2 < f7 / f < 3.9. Satisfying the above range, the seventh lens is defined to have proper positive refractive power, which is beneficial to light convergence, makes the light trend transition to the rear smoothly, reduces the height of the light incident to the rear, slows down the upward trend of the light, is beneficial to improve the illumination of the edge field, and realizes a short total optical length. More specifically: 2.03 < f7 / f < 3.81.

[0081] In some embodiments, the optical lens satisfies the following conditional expressions: 3.8mm < f < 4.1mm; 132° < FOV < 140°; 2mm < EPD < 2.4mm; 28mm < TTL < 33mm; 1.65 < Fno < 1.9; 9mm < IH < 9.5mm; 16° < CRA < 25°; 4.5mm < BFL < 6mm. In the above conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, IH represents the real image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray angle of incidence at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. The optical lens satisfies the above ranges and has one or more advantages such as a large target surface, a large aperture, an ultra-wide angle, and the like. More specifically, 3.88mm < f < 4.01mm; 132.9° < FOV < 139.1°; 2.1mm < EPD < 2.35mm; 28.4mm < TTL < 32.1mm; 1.69 < Fno < 1.86; 9.24mm < IH < 9.26mm; 16.09° < CRA < 24.01°; 4.81mm < BFL < 5.81mm.

[0082] 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.

[0083] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the fourth lens and the seventh lens of the present application adopt an aspherical lens, the first lens, the second lens, the fifth lens, and the sixth lens adopt a spherical lens, and the third lens adopts an aspherical lens or a spherical lens.

[0084] In various embodiments of the present application, when the lens adopts an aspherical lens, each aspherical surface shape of the optical lens satisfies the following equation:

[0085]

[0086] Wherein, z is the distance of the curved surface and the curved surface vertex in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the curved surface vertex, K is the quadratic curved surface coefficient, B, C, D, E, F are the fourth order, sixth order, eighth order, tenth order, twelfth order curved surface coefficients respectively.

[0087] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, 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 the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0088] Embodiment 1

[0089] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application, the optical lens 100 includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0090] The first lens L1 has a negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;

[0091] The second lens L2 has a negative focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;

[0092] The third lens L3 has a positive focal power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface;

[0093] The fourth lens L4 has a negative focal power, the object side surface S7 is a concave surface, and the image side surface S8 is a convex surface;

[0094] The fifth lens L5 has a positive focal power, the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface;

[0095] The sixth lens L6 has a negative focal power, the object side surface S10 is a concave surface, and the image side surface S11 is a concave surface;

[0096] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface of the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0097] The seventh lens L7 has a positive focal power, the object side surface S12 is a convex surface, and the image side surface S13 is a concave surface;

[0098] The object-side surface S14 and the image-side surface S15 of filter G1 are both planar.

[0099] The object side S16 and the image side S17 of the protective glass G2 are both flat.

[0100] The imaging plane S18 is a plane.

[0101] The third lens L3, the fourth lens L4, and the seventh lens L7 are glass aspherical lenses, while the first lens L1, the second lens L2, the fifth lens L5, and the sixth lens L6 are glass spherical lenses.

[0102] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0103] Table 1-1

[0104]

[0105] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0106] Table 1-2

[0107]

[0108]

[0109] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 As shown.

[0110] Figure 2 The F-Tan (Theta) distortion curve of Example 1 is shown, which represents the distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the distortion of the optical lens is controlled within -50% to 0%, indicating that the optical lens 100 can effectively correct distortion.

[0111] 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.

[0112] Example 2

[0113] Please see Figure 4 The figure shown is a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0114] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0115] Table 2-1

[0116]

[0117]

[0118] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0119] Table 2-2

[0120] Figure 5 K B C D E F S5 -8.07E+01 -8.54E-04 8.69E-06 3.19E-07 5.65E-08 -1.64E-09 S6 -5.78E+00 -4.21E-04 -2.32E-05 1.13E-05 -8.22E-07 2.97E-08 S7 -1.71E+02 -4.05E-04 9.06E-07 -1.82E-05 2.46E-06 -1.31E-07 S8 1.26E+02 -4.35E-03 2.01E-04 -1.67E-05 1.18E-06 -5.29E-08 S12 -1.97E-01 -1.30E-03 4.21E-05 2.88E-06 1.29E-07 -1.65E-09 S13 5.78E+00 1.33E-04 1.07E-05 8.84E-06 -2.98E-07 2.27E-08

[0121] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 5 As shown. From Figure 6 As can be seen, the distortion of optical lens 200 is controlled within -55% to 0%, indicating that optical lens 200 can effectively correct distortion. From Figure 7 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.

[0122] Example 3

[0123] Please see Figure 8 The figure shown is a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0124] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0125] Table 3-1

[0126]

[0127]

[0128] The surface profile parameters of the aspherical lenses of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0129] Table 3-2

[0130] Figure 9 K B C D E F S5 6.27E+01 -9.92E-04 3.64E-07 3.91E-07 3.91E-08 -5.87E-10 S6 -4.65E+00 -9.17E-04 2.58E-05 2.21E-06 -1.67E-07 5.58E-09 S7 -1.99E+02 6.27E-04 -8.56E-05 -2.81E-06 7.93E-07 -4.61E-08 S8 4.80E+01 -2.22E-03 1.36E-05 4.96E-06 -3.14E-07 3.53E-09 S12 -4.21E-01 -1.96E-03 5.00E-05 -1.23E-06 4.63E-07 -7.64E-09 S13 1.80E+01 -7.59E-04 -1.33E-05 5.95E-06 -1.53E-07 1.74E-08

[0131] In the present embodiment, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens 300 are shown in Figure 8 , Figure 9 respectively. As can be seen from Figure 10 , the distortion of the optical lens is controlled within -60%~0%, which indicates that the optical lens 300 can correct distortion well. As can be seen from Figure 11 , the MTF value of the present embodiment is above 0.2 within the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view within the range of 0~300 lp / mm, which has good imaging quality and good detail resolution ability in both low frequency and high frequency cases.

[0132] Embodiment 4

[0133] Please refer to Figure 12 , which is a structural schematic diagram of the optical lens 400 provided in Embodiment 4 of the present application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radii of curvature of the surfaces of the lenses and the thicknesses of the lenses are different.

[0134] The related parameters of the lenses in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0135] Table 4-1

[0136]

[0137] The surface profile parameters of the aspherical lenses of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0138] Table 4-2

[0139] Figure 11 K B C D E F S5 -2.00E+02 -1.54E-03 -1.49E-05 4.02E-07 1.83E-07 -5.11E-09 S6 -5.83E+00 -1.48E-03 4.62E-05 6.04E-06 -5.50E-07 2.19E-08 S7 -1.05E+02 1.14E-03 -3.95E-05 -6.48E-06 2.42E-06 -9.39E-08 S8 8.11E+01 -2.59E-03 5.51E-05 1.17E-05 -8.24E-07 7.05E-08 S12 -5.35E+00 -2.38E-06 1.34E-05 -1.41E-06 6.34E-07 -1.40E-08 S13 -5.50E+01 8.78E-04 -3.73E-05 8.02E-06 -1.19E-07 1.88E-08

[0140] In the present embodiment, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens 400 are shown in Figure 12 , Figure 13 respectively. As can be seen from Figure 14 , the distortion of the optical lens 400 is controlled within -55%~0%, which indicates that the optical lens 400 can correct distortion well. As can be seen from Figure 15As can be seen, the MTF value of this embodiment is above 0.1 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.

[0141] Example 5

[0142] Please see Figure 14 The figure shows a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side S13 of the seventh lens L7 is a convex surface; the third lens L3 is a glass spherical lens; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0143] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0144] Table 5-1

[0145]

[0146] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0147] Table 5-2

[0148]

[0149]

[0150] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 500 are shown as follows: Figure 15 , Figure 16 As shown. From Figure 17 As can be seen, the distortion of optical lens 500 is controlled within -55% to 0%, indicating that optical lens 500 can effectively correct distortion. From... Figure 18 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 160 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.

[0151] Example 6

[0152] Please see Figure 17The figure shows a schematic diagram of the structure of the optical lens 600 provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side surface S13 of the seventh lens L7 is a convex surface; the third lens L3 is a glass spherical lens; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0153] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0154] Table 6-1

[0155]

[0156]

[0157] The surface profile parameters of the aspherical lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0158] Table 6-2

[0159] Figure 18 K B C D E F S7 -5.07E-01 5.32E-03 3.23E-04 -1.04E-05 8.97E-07 -8.65E-08 S8 -2.15E+00 3.72E-04 3.24E-04 -4.17E-06 8.60E-08 -2.73E-08 S12 -6.90E-01 1.15E-03 -1.03E-04 8.96E-06 -3.69E-07 6.11E-09 S13 3.03E-01 1.04E-03 -1.41E-05 6.09E-06 -3.72E-07 1.33E-08

[0160] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 600 are respectively as follows: Figure 19 , Figure 20 As shown. From Figure 21 As can be seen, the distortion of optical lens 600 is controlled within -60% to 0%, indicating that optical lens 600 can effectively correct distortion. From Figure 20 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 160 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.

[0161] Example 7

[0162] Please see Figure 21 The figure shown is a schematic diagram of the structure of the optical lens 700 provided in Embodiment 7 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side surface S13 of the seventh lens L7 is a convex surface; the third lens L3 is a glass spherical lens; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0163] The relevant parameters of each lens in the optical lens 700 in Example 7 are shown in Table 7-1.

[0164] Table 7-1

[0165]

[0166]

[0167] The surface profile parameters of the aspherical lens of the optical lens 700 in Example 7 are shown in Table 7-2.

[0168] Table 7-2

[0169] Figure 22 K B C D E F S7 -7.13E-03 5.63E-03 1.95E-04 -6.96E-06 1.06E-06 -5.06E-08 S8 -2.83E+00 4.52E-04 1.95E-04 -6.61E-06 3.91E-07 -2.18E-08 S12 -2.62E-01 7.41E-04 -7.41E-05 6.23E-06 -2.38E-07 3.63E-09 S13 -1.24E+00 7.01E-04 -1.83E-05 6.20E-06 -3.71E-07 1.26E-08

[0170] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 700 are shown as follows: Figure 23 , Figure 24 As shown. From Figure 23 As can be seen, the distortion of the optical lens 700 is controlled within -60% to 0%, indicating that the optical lens 700 can effectively correct distortion. From... Figure 24 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 160 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.

[0171] Example 8

[0172] Please see ​ The figure shown is a schematic diagram of the structure of the optical lens 800 provided in Embodiment 8 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the image side S13 of the seventh lens L7 is a convex surface; the third lens L3 is a glass spherical lens; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0173] The relevant parameters of each lens in the optical lens 800 in Example 8 are shown in Table 8-1.

[0174] Table 8-1

[0175]

[0176]

[0177] The surface profile parameters of the aspherical lens of the optical lens 800 in Example 8 are shown in Table 8-2.

[0178] Table 8-2

[0179] ​ K B C D E F S7 -5.31E-01 7.11E-03 2.32E-04 3.77E-05 -7.42E-06 3.58E-07 S8 -2.99E+00 -5.76E-04 5.40E-04 5.56E-06 -3.57E-06 1.76E-07 S12 -1.14E+00 1.36E-03 -1.02E-04 1.17E-05 -5.85E-07 1.12E-08 S13 -4.23E-01 9.65E-04 -1.94E-05 8.54E-06 -5.69E-07 2.24E-08

[0180] In this embodiment, the F-Tan (Theta) distortion curve and MTF curve of the optical lens 800 are respectively as follows: ​ , ​ As shown. From ​As can be seen, the distortion of the optical lens 800 is controlled within -55%~0%, which indicates that the optical lens 800 can well correct the distortion.

[0181] From ​ As can be seen, the MTF value of the embodiment is above 0.3 within the full field of view, and the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view within the range of 0~160 lp / mm, and has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0182] Please refer to Table 9 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 chief ray angle of incidence CRA at the maximum image height, the real image height IH corresponding to the maximum field of view, the maximum field of view FOV, the entrance pupil diameter EPD, the back focal length BFL, and the numerical value corresponding to each conditional expression in each embodiment.

[0183] Table 9

[0184]

[0185]

[0186]

[0187] In summary of the above embodiments, the optical lens provided by the present application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as large target surface, large aperture, ultra-wide angle, etc.

[0188] 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.

[0189] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. An optical lens, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a second lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a third lens with positive refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fourth lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fifth lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a sixth lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface; a seventh lens with positive refractive power, the object side surface of which is a convex surface; wherein the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: 0.7 < (R5-R6) / (R5+R6) < 1; the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.4 < (IH / 2) / (f*Tan(FOV / 2)) < 0.55; and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2 < f4567 / f < 18.

2. The optical lens of claim 1, wherein, The object side surface curvature radius R5 of the third lens and the image side surface curvature radius R6 of the third lens satisfy: 0.75 < (R5-R6) / (R5+R6) < 0.93; the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.42 < (IH / 2) / (f*Tan(FOV / 2)) < 0.53; and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2.03 < f4567 / f < 17.

7.

3. The optical lens of claim 1, wherein, The maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 72° < FOV / Fno < 81°; the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.9 < IH / EPD < 4.

4.

4. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.3 < IH / f < 2.4; and the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 1.2 < BFL / f < 1.

5.

5. The optical lens of claim 1, wherein, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -141 < f2 / f < -11; the object side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: -3.3 < R3 / f < -2.2; and the image side surface curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -5.1 < R4 / f < -2.

7.

6. The optical lens of claim 1, wherein, A focal length f3 of the third lens and an effective focal length f of the optical lens satisfy: 1.8 < f3 / f < 6.5; a radius of curvature R5 on an object side of the third lens and the effective focal length f of the optical lens satisfy: -87 < R5 / f < -9; and a radius of curvature R6 on an image side of the third lens and the effective focal length f of the optical lens satisfy: -6 < R6 / f < -1.

7. The optical lens of claim 1, wherein, A focal length f4 of the fourth lens and an effective focal length f of the optical lens satisfy: -181 < f4 / f < -9.5; a radius of curvature R7 on an object side of the fourth lens and the effective focal length f of the optical lens satisfy: -4.8 < R7 / f < -0.75; and a radius of curvature R8 on an image side of the fourth lens and the effective focal length f of the optical lens satisfy: -10 < R8 / f < -0.

8.

8. The optical lens of claim 1, wherein, A radius of curvature R3 on an object side of the second lens and a radius of curvature R4 on an image side of the second lens satisfy: -0.3 < (R3-R4) / (R3+R4) < -0.1; and a radius of curvature R7 on an object side of the fourth lens and a radius of curvature R8 on an image side of the fourth lens satisfy: -0.5 < (R7-R8) / (R7+R8) < 0.

9. The optical lens of claim 1, wherein, A sagittal height Sag4 of a half radius of light passage on an image side of the second lens and a half radius of light passage d4 of the second lens satisfy: -0.23 < Sag4 / d4 < -0.09; and a sagittal height Sag5 of a half radius of light passage on an object side of the third lens and a half radius of light passage d5 of the third lens satisfy: -0.14 < Sag5 / d5 < 0.

10. The optical lens of claim 1, wherein, A radius of curvature R3 on an object side of the second lens, a radius of curvature R4 on an image side of the second lens, and a central thickness CT2 of the second lens satisfy: 0.3 < (R3+CT2) / R4 < 0.5; and a radius of curvature R5 on an object side of the third lens, a radius of curvature R6 on an image side of the third lens, and a central thickness CT3 of the third lens satisfy: 7 < (R5+CT3) / R6 < 23.

Images