Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence from an object side to an imaging surface along an optical axis, 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 image side surface of the second lens is a concave surface; a third lens with positive optical power, wherein the object side surface of the third lens is a convex surface; a fourth lens with negative optical power, wherein the image side surface of the fourth lens is a concave surface; a fifth lens with positive optical power, wherein the object side surface and the image side surface of the fifth lens are both convex surfaces; a sixth lens with positive optical power, wherein the object side surface of the sixth lens is a convex surface; and a seventh lens with positive optical power. The optical lens provided by the application improves the imaging quality of the optical lens, reduces aberration and improves the imaging quality of the optical lens through reasonable configuration of the surface type of each lens and reasonable matching of optical power.

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] The panoramic surround view system sets up multiple surround view cameras around the vehicle, which can cover all the field of view ranges around the vehicle. The view angles of the multiple cameras are fused into a 360-degree overhead view of the vehicle body, and finally displayed on the screen of the center console, so that the driver can clearly check whether there are obstacles around the vehicle and understand the relative position and distance of the obstacles, helping the driver to easily park the vehicle. Not only is it very intuitive, but also there is no blind spot, which can improve the driver's comfortable control of the vehicle parking or passing through complex roads, effectively reducing the occurrence of accidents such as scratching, collision, and sinking.

[0004] At present, the surround view camera lens generally uses a wide-angle lens, which has the problems of large aberration, large field curvature, poor imaging quality, etc., and is difficult to meet the user's needs. SUMMARY

[0005] 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.

[0006] 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:

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

[0008] a second lens with negative focal power, whose image side surface is concave;

[0009] a third lens with positive focal power, whose object side surface is convex;

[0010] a fourth lens with negative focal power, whose image side surface is concave;

[0011] a fifth lens with positive focal power, whose object side surface and image side surface are both convex;

[0012] a sixth lens with positive focal power, whose object side surface is convex;

[0013] a seventh lens with positive focal power.

[0014] Further preferably, the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: 0.5<(R3+R4) / (R3-R4)<3.0.

[0015] It is further preferred that 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: -6.0 < (R5+R6) / (R5-R6) < 57.0.

[0016] It is further preferred that the total track length TTL of the optical lens and the effective focal length f satisfy: 8.5 < TTL / f < 10.0.

[0017] It is further preferred that the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy: 2.8 < TTL / IH < 3.5.

[0018] It is further preferred that the effective focal length f of the optical lens and the radian θ of the maximum half field of view angle and the real image height IH corresponding to the maximum field of view angle satisfy: 0.8 < (IH / 2) / (f x θ) < 1.0.

[0019] It is further preferred that the maximum field of view angle FOV of the optical lens and the aperture value FNO satisfy: 85° < FOV / FNO < 130°.

[0020] It is further preferred that the real image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD satisfy: 4.0 < IH / EPD < 6.0.

[0021] It is further preferred that the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -7.5 < f1 / f < -2.5.

[0022] It is further preferred that the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4.0 < f2 / f < -2.0.

[0023] The optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of optical power. BRIEF DESCRIPTION OF DRAWINGS

[0024] 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:

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

[0026] Figure 2 FIG. 2 is a field curvature curve diagram of the optical lens according to the embodiment of the present application.

[0027] Figure 3F-Theta distortion curve of the optical lens in Embodiment 1 of the present application.

[0028] Figure 4 Relative illumination curve of the optical lens in Embodiment 1 of the present application.

[0029] Figure 5 MTF curve of the optical lens in Embodiment 1 of the present application.

[0030] Figure 6 Axial aberration curve of the optical lens in Embodiment 1 of the present application.

[0031] Figure 7 Vignetting curve of the optical lens in Embodiment 1 of the present application.

[0032] Figure 8 Structure diagram of the optical lens in Embodiment 2 of the present application.

[0033] Figure 9 Curvature of field curve of the optical lens in Embodiment 2 of the present application.

[0034] Figure 10 F-Theta distortion curve of the optical lens in Embodiment 2 of the present application.

[0035] Figure 11 Relative illumination curve of the optical lens in Embodiment 2 of the present application.

[0036] Figure 12 MTF curve of the optical lens in Embodiment 2 of the present application.

[0037] Figure 13 Axial aberration curve of the optical lens in Embodiment 2 of the present application.

[0038] Figure 14 Vignetting curve of the optical lens in Embodiment 2 of the present application.

[0039] Figure 15 Structure diagram of the optical lens in Embodiment 3 of the present application.

[0040] Figure 16 Curvature of field curve of the optical lens in Embodiment 3 of the present application.

[0041] Figure 17 F-Theta distortion curve of the optical lens in Embodiment 3 of the present application.

[0042] Figure 18 Relative illumination curve of the optical lens in Embodiment 3 of the present application.

[0043] Figure 19 MTF curve of the optical lens in Embodiment 3 of the present application.

[0044] Figure 20 Axial aberration curve of the optical lens in embodiment 3 of the present application.

[0045] Figure 21 Vignetting curve of the optical lens in embodiment 3 of the present application.

[0046] Figure 22 Structure diagram of the optical lens in embodiment 4 of the present application.

[0047] Figure 23 Curvature of field curve of the optical lens in embodiment 4 of the present application.

[0048] Figure 24 F-Theta distortion curve of the optical lens in embodiment 4 of the present application.

[0049] Figure 25 Relative illumination curve of the optical lens in embodiment 4 of the present application.

[0050] Figure 26 MTF curve of the optical lens in embodiment 4 of the present application.

[0051] Figure 27 Axial aberration curve of the optical lens in embodiment 4 of the present application.

[0052] Figure 28 Vignetting curve of the optical lens in embodiment 4 of the present application.

[0053] Figure 29 Structure diagram of the optical lens in embodiment 5 of the present application.

[0054] Figure 30 Curvature of field curve of the optical lens in embodiment 5 of the present application.

[0055] Figure 31 F-Theta distortion curve of the optical lens in embodiment 5 of the present application.

[0056] Figure 32 Relative illumination curve of the optical lens in embodiment 5 of the present application.

[0057] Figure 33 MTF curve of the optical lens in embodiment 5 of the present application.

[0058] Figure 34 Axial aberration curve of the optical lens in embodiment 5 of the present application.

[0059] Figure 35 Vignetting curve of the optical lens in embodiment 5 of the present application.

[0060] Figure 36 Structure diagram of the optical lens in Embodiment 6 of the present application.

[0061] Figure 37 Field curvature curve of the optical lens in Embodiment 6 of the present application.

[0062] Figure 38 F-Theta distortion curve of the optical lens in Embodiment 6 of the present application.

[0063] Figure 39 Relative illumination curve of the optical lens in Embodiment 6 of the present application.

[0064] Figure 40 MTF curve of the optical lens in Embodiment 6 of the present application.

[0065] Figure 41 Axial aberration curve of the optical lens in Embodiment 6 of the present application.

[0066] Figure 42 Vignetting curve of the optical lens in Embodiment 6 of the present application.

[0067] Figure 43 Structure diagram of the optical lens in Embodiment 7 of the present application.

[0068] Figure 44 Field curvature curve of the optical lens in Embodiment 7 of the present application.

[0069] Figure 45 F-Theta distortion curve of the optical lens in Embodiment 7 of the present application.

[0070] Figure 46 Relative illumination curve of the optical lens in Embodiment 7 of the present application.

[0071] Figure 47 MTF curve of the optical lens in Embodiment 7 of the present application.

[0072] Figure 48 Axial aberration curve of the optical lens in Embodiment 7 of the present application.

[0073] Figure 49 Vignetting curve of the optical lens in Embodiment 7 of the present application.

[0074] Figure 50 Structure diagram of the optical lens in Embodiment 8 of the present application.

[0075] Figure 51 Field curvature curve of the optical lens in Embodiment 8 of the present application.

[0076] Figure 52F-Theta distortion curve of the optical lens in Embodiment 8 of the present application.

[0077] Figure 53 Relative illumination curve of the optical lens in Embodiment 8 of the present application.

[0078] Figure 54 MTF curve of the optical lens in Embodiment 8 of the present application.

[0079] Figure 55 Axial chromatic aberration curve of the optical lens in Embodiment 8 of the present application.

[0080] Figure 56 Vignetting curve of the optical lens in Embodiment 8 of the present application.

[0081] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0082] 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 understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0083] It is to be noted that the expressions first, second, third, etc. in the present specification are merely used 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.

[0084] In the drawings, the thickness, size, and shape of lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of a spherical surface or an aspherical surface shown in the drawings is shown by way of example. That is, the shape of a spherical surface or an aspherical surface is not limited to the shape of a spherical surface or an aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0085] 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.

[0086] It should also be understood that the words "comprise," "comprising," "include," "including," and / or "has," "having," when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when terms such as "at least one of" are used, this is meant to instill an inclusionary meaning, as opposed to an exclusive one. 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 terminology "example" or "exemplary" is intended to mean an example or instance, rather than an ideal.

[0087] 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.

[0088] It should be noted that the embodiments in the present application and the features in the embodiments 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 the embodiments.

[0089] The optical lens of the embodiment of the present application comprises, in order from the object side to the imaging surface along the optical axis, a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a filter, and a protective glass.

[0090] In some embodiments, the first lens can have a negative focal power, which is conducive to reducing the angle of incidence of the incident light, thereby effectively sharing the large field of view on the object side. The object side of the first lens is convex, and the image side is concave, which is conducive to collecting as much edge field of view light as possible into the rear optical lens, thereby realizing large-angle light collection.

[0091] In some embodiments, the second lens can have a negative focal power, which can share the negative focal power of the front end of the lens, thereby reducing the excessive deflection of light caused by the excessive concentration of the focal power of the first lens, and reducing the difficulty of correcting the chromatic aberration of the optical lens. The image side of the second lens is concave, which is conducive to converging the outgoing light, avoiding excessive size of the lens outer diameter.

[0092] In some embodiments, the third lens can have a positive focal power, which is conducive to improving the light convergence ability of the optical lens. The object side of the third lens is convex, which is conducive to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.

[0093] In some embodiments, the fourth lens can have a negative focal power, and the image side surface thereof is concave, which is beneficial to reduce the light deflection angle, to make the light trend transition smoothly, and to improve the imaging quality of the optical lens.

[0094] In some embodiments, the fifth lens can have a positive focal power, and both the object side surface and the image side surface thereof are convex, which is beneficial to improve the light converging ability of the optical lens, to balance the aberrations of the optical lens, and to improve the imaging quality of the optical lens.

[0095] In some embodiments, the sixth lens can have a positive focal power, and the object side surface thereof is convex, which is beneficial to improve the light converging ability of the optical lens, to balance various aberrations generated by the optical lens, and to improve the imaging quality of the optical lens.

[0096] In some embodiments, the seventh lens can have a positive focal power, which is beneficial to suppress the angle of the edge field of view incident on the imaging surface, to effectively deliver more light beams to the imaging surface, and to improve the imaging quality of the optical lens.

[0097] In some embodiments, the object side surface radius of curvature R3 of the second lens and the image side surface radius of curvature R4 of the second lens satisfy: 0.5<(R3+R4) / (R3-R4)<3.0. Satisfying the above range can effectively receive the outgoing light from the image side surface of the first lens, and improve the relative luminance of the optical lens.

[0098] In some embodiments, the object side surface radius of curvature R5 of the third lens and the image side surface radius of curvature R6 of the third lens satisfy: -6.0<(R5+R6) / (R5-R6)<57.0. Satisfying the above range can reduce the light deflection angle, and the light trend is more stable.

[0099] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f satisfy: 8.5<TTL / f<10.0. Satisfying the above range ensures sufficient space to adjust the lens structure and optimizes the imaging effect.

[0100] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy: 2.8<TTL / IH<3.5. Satisfying the above range can effectively balance the demand for image height and miniaturization of the optical lens.

[0101] In some embodiments, the effective focal length f of the optical lens, the radian θ of the maximum half field of view angle, and the real image height IH corresponding to the maximum field of view angle satisfy: 0.8<(IH / 2) / (f x θ)<1.0. Satisfying the above range is beneficial to control the smooth change of the edge distortion of the optical lens, and facilitates the restoration through the software algorithm later.

[0102] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 85°<FOV / FNO<130°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the realization of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of edge field of view, thereby also conducive to obtaining more scene information.

[0103] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 85°<FOV / FNO<130°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the realization of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of edge field of view, thereby also conducive to obtaining more scene information.

[0104] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 85°<FOV / FNO<130°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the realization of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of edge field of view, thereby also conducive to obtaining more scene information.

[0105] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 85°<FOV / FNO<130°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the realization of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of edge field of view, thereby also conducive to obtaining more scene information.

[0106] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 85°<FOV / FNO<130°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the realization of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of edge field of view, thereby also conducive to obtaining more scene information.

[0107] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 85°<FOV / FNO<130°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the realization of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of edge field of view, thereby also conducive to obtaining more scene information.

[0108] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 85°<FOV / FNO<130°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the realization of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of edge field of view, thereby also conducive to obtaining more scene information.

[0109] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -8.5 < f4 / f < -1.5. Satisfying the above range can make the fourth lens have appropriate negative refractive power, which is conducive to reducing the light deflection angle, making the light trend transition smoothly, and improving the imaging quality of the optical lens.

[0110] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 1.5 < f5 / f < 4.0. Satisfying the above range can make the fifth lens have appropriate positive refractive power, which is conducive to improving the light converging ability of the optical lens, and balancing various aberrations generated by the optical lens, and improving the imaging quality of the optical lens.

[0111] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2.8 < f6 / f < 6.0. Satisfying the above range can make the sixth lens have appropriate positive refractive power, which is conducive to improving the light converging ability of the optical lens, and balancing various aberrations generated by the optical lens, and improving the imaging quality of the optical lens.

[0112] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 5.0 < f7 / f < 50.0. Satisfying the above range can make the seventh lens have appropriate positive refractive power, which is conducive to suppressing the angle of the edge field of view incident on the imaging surface, effectively transmitting more light beams to the imaging surface, and improving the imaging quality of the optical lens.

[0113] In some embodiments, the maximum field of view angle FOV of the optical lens satisfies: 175° < FOV < 205°. Satisfying the above range can realize that the optical lens has a large field of view angle.

[0114] In some embodiments, the aperture value FNO of the optical lens satisfies: 1.5 < FNO < 2.1. Satisfying the above range is conducive to realizing the large aperture characteristics of the lens, increasing the light quantity, and improving the imaging effect of the lens in a dark environment.

[0115] 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: 2.0 < R1 / R2 < 8.5. Satisfying the above range is conducive to realizing the wide-angle characteristics, so as to obtain more scene information and meet the needs of wide-range detection of the optical lens.

[0116] In some embodiments, the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: -27.5 < R3 / R4 < 8.5. Satisfying the above range can balance the aberrations generated by the second lens itself, thereby improving the imaging quality of the lens.

[0117] In some embodiments, the radius of curvature R1 of the object side surface of the first lens satisfies 5.5 < R1 / f, and the radius of curvature R2 of the image side surface of the first lens satisfies R2 / f < 2.6, where f is the effective focal length of the optical lens. The above ranges are beneficial to achieve the ultra-wide-angle characteristic, so as to obtain more scene information and meet the requirement of wide-range detection of the optical lens.

[0118] In some embodiments, the total length TTL of the optical lens satisfies 0.3 < ∑CT / TTL < 0.6, where ∑CT is the sum of the central thicknesses of the first lens to the seventh lens along the optical axis. The above ranges are beneficial to the structural design and production process of the optical lens.

[0119] In some embodiments, the central thickness CT3 of the third lens along the optical axis satisfies 0.4 < CT3 / f < 2.0, where f is the effective focal length of the optical lens. The above ranges are beneficial to improve the field curvature of the ultra-wide-angle lens by setting the thickness of the third lens, reduce the difficulty of lens aberration optimization, and thus improve the imaging quality of the lens.

[0120] 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. In addition, the cemented lens can reduce the assembly sensitivity of the optical lens, thereby reducing the difficulty of the production process of the optical lens and improving the assembly yield of the optical lens.

[0121] In some embodiments, the seventh lens can adopt the surface type of an aspherical lens to improve the resolution quality.

[0122] In order to make the system have better optical performance, an aspherical lens is adopted in the lens, and each aspherical surface of the optical lens satisfies the following equation:

[0123]

[0124] 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, A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0125] 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.

[0126] Embodiment 1

[0127] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in the embodiment 1 of the application, the optical lens 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.

[0128] The first lens L1 has negative optical power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;

[0129] The second lens L2 has negative optical power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;

[0130] The third lens L3 has positive optical power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface;

[0131] The diaphragm ST;

[0132] The fourth lens L4 has negative optical power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface;

[0133] The fifth lens L5 has positive optical power, the object side surface S8 and the image side surface S9 are both convex surfaces;

[0134] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface of the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;

[0135] The sixth lens L6 has positive optical power, the object side surface S10 and the image side surface S11 are both convex surfaces;

[0136] The seventh lens L7 has positive optical power, the object side surface S12 is a concave surface, and the image side surface S13 is a convex surface;

[0137] The object side surface S14 and the image side surface S15 of the filter G1 are both flat surfaces;

[0138] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0139] The imaging surface S18 is a plane.

[0140] The related parameters of each lens in the optical lens in Embodiment 1 are shown in Table 1-1.

[0141] Table 1-1

[0142]

[0143]

[0144] The surface type parameters of the aspherical lens of the optical lens in Embodiment 1 are shown in Table 1-2.

[0145] Table 1-2

[0146] Figure 2 K A B C D E F S12 -1.00E+02 0.00E+00 -2.41E-03 1.81E-04 -2.86E-05 1.89E-06 -4.05E-08 S13 -1.00E+02 0.00E+00 -2.62E-03 3.19E-04 -3.21E-05 1.79E-06 -3.23E-08

[0147] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and transverse aberration curve of the optical lens are shown in FIGS. Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 2

[0148] Figure 3 The field curvature curve of Embodiment 1 is shown, which represents the curvature of the meridional image surface and sagittal image surface of light rays of different wavelengths, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.09mm-0.05mm, which shows that the optical lens can well correct the field curvature.

[0149] Figure 4 The F-Theta distortion curve of Embodiment 1 is shown, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -10%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0150] Figure 5 The relative illumination curve of Embodiment 1 is shown, which represents the relative illumination value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, which shows that the optical lens has good relative illumination.

[0151] ​Figure 6 The MTF (Modulation Transfer Function) curve of the optical lens of the embodiment 1 is shown, which represents the imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0152] Figure 7 The axial aberration curve of the optical lens of the embodiment 1 is shown, which represents the aberration of the optical axis at the imaging surface at each wavelength, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within-5 μm-20 μm, which shows that the optical lens can better correct the axial aberration.

[0153] Figure 8 The curve of the axial aberration of the optical lens of the embodiment 1 is shown, which represents the color difference of different image heights on the imaging surface at each wavelength relative to the center wavelength (0.55 μm), the horizontal axis represents the axial aberration value (unit: μm) of each wavelength relative to the center wavelength, and the vertical axis represents the normalized field of view angle. It can be seen from the figure that the axial aberration of the longest wavelength and the shortest wavelength is controlled within-4 μm-6 μm, which shows that the optical lens can very well correct the color difference of the edge field of view and the secondary spectrum of the entire image surface.

[0154] Embodiment 2

[0155] Please refer to Figure 9 , which is a structural schematic diagram of the optical lens provided in the embodiment 2 of the present application, and compared with the embodiment 1, the main difference is that the curvature radius, lens thickness and other optical parameters of each lens surface are different.

[0156] The related parameters of each lens in the optical lens in the embodiment 2 are shown in Table 2-1.

[0157] Table 2-1

[0158]

[0159]

[0160] The surface type parameters of the aspherical lens of the optical lens in the embodiment 2 are shown in Table 2-2.

[0161] Table 2-2

[0162] Figure 10 K A B C D E F S12 -1.00E+02 0.00E+00 -1.45E-02 1.78E-03 -1.33E-04 5.52E-06 -9.80E-08 S13 -2.45E+01 0.00E+00 -1.18E-02 1.48E-03 -9.27E-05 3.38E-06 -5.29E-08

[0163] In the present embodiment, the field curvature curve, the F-Theta distortion curve, the relative illumination curve, the MTF curve, the axial aberration curve, and the transverse aberration curve of the optical lens are shown in FIGS. 1-4, respectively. Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 9 、 Figure 10

[0164] Figure 11 The field curvature curve of Example 2 is shown, which represents the curvature of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.05mm-0.1mm, which shows that the optical lens can well correct the field curvature.

[0165] Figure 12 The F-Theta distortion curve of Example 2 is shown, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -10%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0166] Figure 13 The relative illumination curve of Example 2 is shown, which represents the relative illumination value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, which shows that the optical lens has good relative illumination.

[0167] Figure 14 The MTF (Modulation Transfer Function) curve of Example 2 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the present embodiment is above 0.3 within the full field of view, and within the range of 0-160lp / 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 cases.

[0168] Figure 15 ​The axial aberration curve of the embodiment 2 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the shift of the axial aberration is controlled within -10 μm-50 μm, which shows that the optical lens can better correct the axial aberration.

[0169] Figure 16 The curve of the embodiment 2 is shown, which represents the color difference of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.55 μm), the horizontal axis represents the color difference value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial aberration of the longest wavelength and the shortest wavelength is controlled within -5 μm-6 μm, which shows that the optical lens can very well correct the color difference of the edge field and the secondary spectrum of the entire image plane.

[0170] Embodiment 3

[0171] Please refer to Figure 17 , which is a structural schematic diagram of the optical lens provided in the embodiment 3 of the present application, which comprises, along the optical axis from the object side to the imaging plane, a first lens L1, a second lens L2, a third lens L3, a stop 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.

[0172] The first lens L1 has a negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface;

[0173] The second lens L2 has a negative focal power, and the object side S3 and the image side S4 are both concave surfaces;

[0174] The third lens L3 has a positive focal power, and the object side S5 and the image side S6 are both convex surfaces;

[0175] The stop ST;

[0176] The fourth lens L4 has a negative focal power, and the object side S7 and the image side S8 are both concave surfaces;

[0177] The fifth lens L5 has a positive focal power, and the object side S9 and the image side S10 are both convex surfaces;

[0178] The sixth lens L6 has a positive focal power, and the object side S11 and the image side S12 are both convex surfaces;

[0179] The seventh lens L7 has a positive focal power, and the object side S13 is a convex surface and the image side S14 is a concave surface;

[0180] The object side S15 and the image side S16 of the filter G1 are both flat surfaces;

[0181] The object side S17 and the image side S18 of the protective glass G2 are both planar;

[0182] The imaging surface S19 is planar.

[0183] The related parameters of each lens in the optical lens in Embodiment 3 are shown in Table 3-1.

[0184] Table 3-1

[0185]

[0186]

[0187] The surface type parameters of the aspherical lens of the optical lens in Embodiment 3 are shown in Table 3-2.

[0188] Table 3-2

[0189] Figure 18 K A B C D E F S13 -6.79E+00 0.00E+00 -2.09E-03 -1.97E-04 -5.58E-06 1.12E-06 -2.81E-08 S14 -3.00E+01 0.00E+00 1.81E-03 -5.73E-04 3.73E-05 -1.02E-06 1.02E-08

[0190] In this embodiment, the field curvature curve, the F-Theta distortion curve, the relative illumination curve, the MTF curve, the axial aberration curve, and the transverse chromatic aberration curve of the optical lens are shown in FIGS. Figure 19 、 Figure 20 、 Figure 21 、 Figure 16 、 Figure 17 、 Figure 18 respectively.

[0191] Figure 19 The field curvature curve of Embodiment 3 is shown, which represents the curvature degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.1mm-0.05mm, which shows that the optical lens can well correct the field curvature.

[0192] Figure 20 The F-Theta distortion curve of Embodiment 3 is shown, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -9%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0193] Figure 21The relative luminance curve of the embodiment 3 is shown, which represents the relative luminance values of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative luminance (unit: %). As can be seen from the figure, the relative luminance value of the optical lens is still greater than 50% at the maximum half field angle, which indicates that the optical lens has good relative luminance.

[0194] Figure 22 The MTF (modulation transfer function) curve of the embodiment 3 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.4 within the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0195] Figure 23 The axial aberration curve of the embodiment 3 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-10 μm-10 μm, which indicates that the optical lens can better correct the axial aberration.

[0196] Figure 24 The axial aberration curve of the embodiment 3 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-10 μm-10 μm, which indicates that the optical lens can better correct the axial aberration.

[0197] Embodiment 4

[0198] Please refer to Figure 25 , which is a structural schematic diagram of the optical lens provided in the embodiment 4 of the present application, which comprises, 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 stop 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.

[0199] The first lens L1 has a negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface;

[0200] The second lens L2 has a negative focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface;

[0201] The third lens L3 has positive refractive power, the object side S5 is a convex surface, and the image side S6 is a concave surface;

[0202] The diaphragm ST;

[0203] The fourth lens L4 has negative refractive power, the object side S7 is a convex surface, and the image side S8 is a concave surface;

[0204] The fifth lens L5 has positive refractive power, the object side S8 and the image side S9 are both convex surfaces;

[0205] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8;

[0206] The sixth lens L6 has positive refractive power, the object side S10 and the image side S11 are both convex surfaces; the seventh lens L7 has positive refractive power, the object side S12 and the image side S13 are both convex surfaces; the object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0207] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0208] The imaging surface S18 is a flat surface.

[0209] The related parameters of the lenses in the optical lens in Embodiment 4 are shown in Table 4-1.

[0210] Table 4-1

[0211]

[0212] The surface type parameters of the aspherical lens of the optical lens in Embodiment 4 are shown in Table 4-2.

[0213] Table 4-2

[0214]

[0215]

[0216] In this embodiment, the field curvature curve, the F-Theta distortion curve, the relative luminance curve, the MTF curve, the axial aberration curve, and the off-axis chromatic aberration curve of the optical lens are shown in FIGS. Figure 26 、 Figure 27 、 Figure 28 、 Figure 23 、 Figure 24 、 Figure 25

[0217] Figure 26 ​The field curvature curve of embodiment 4 is shown, which represents the curvature of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.12mm~0.05mm, which shows that the optical lens can well correct the field curvature.

[0218] Figure 27 The F-Theta distortion curve of embodiment 4 is shown, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -10%~0, the image compression in the edge angle region is relatively flat, and the clarity of the unfolded image is effectively improved.

[0219] Figure 28 The relative luminance curve of embodiment 4 is shown, which represents the relative luminance value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative luminance (unit: %). As can be seen from the figure, the relative luminance value of the optical lens is still greater than 50% at the maximum half field angle, which shows that the optical lens has good relative luminance.

[0220] Figure 29 The MTF (Modulation Transfer Function) curve of embodiment 4 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.4 within the full field of view, and within the range of 0~160lp / 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.

[0221] Figure 30 The axial aberration curve of embodiment 4 is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within -10μm~20μm, which shows that the optical lens can well correct the axial aberration.

[0222] Figure 31The vertical color aberration curve of embodiment 4 is shown, which represents the color aberration of each wavelength at different image heights on the imaging surface relative to the central wavelength (0.55 μm), the horizontal axis represents the vertical color aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the vertical color aberration of the longest wavelength and the shortest wavelength is controlled within -4 μm ~ 6 μm, which indicates that the optical lens can well correct the color aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0223] Embodiment 5

[0224] Please refer to Figure 32 , which is a structural schematic diagram of the optical lens provided in embodiment 5 of the present application, which comprises, in order from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a stop 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.

[0225] The first lens L1 has a negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface;

[0226] The second lens L2 has a negative focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface;

[0227] The third lens L3 has a positive focal power, the object side S5 is a convex surface, and the image side S6 is a concave surface;

[0228] The stop ST;

[0229] The fourth lens L4 has a negative focal power, the object side S7 is a convex surface, and the image side S8 is a concave surface;

[0230] The fifth lens L5 has a positive focal power, the object side S8 and the image side S9 are both convex surfaces;

[0231] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8;

[0232] The sixth lens L6 has a positive focal power, the object side S10 and the image side S11 are both convex surfaces;

[0233] The seventh lens L7 has a positive focal power, the object side S12 is a convex surface, and the image side S13 is a concave surface;

[0234] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0235] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0236] The imaging surface S18 is a flat surface.

[0237] The related parameters of each lens in the optical lens in embodiment 5 are shown in table 5-1.

[0238] Table 5-1

[0239]

[0240]

[0241] The surface type parameters of the aspherical lens of the optical lens in embodiment 5 are shown in table 5-2.

[0242] Table 5-2

[0243] Figure 33 K A B C D E F S12 5.21E+00 0.00E+00 -2.02E-03 -1.04E-04 3.27E-06 -1.11E-06 4.85E-08 S13 1.00E+02 0.00E+00 -8.25E-04 -3.16E-05 -1.06E-05 6.20E-07 -6.57E-09

[0244] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens are shown in FIGS. 5-1 to 5-6, respectively. Figure 34 、 Figure 35 、 Figure 30 、 Figure 31 、 Figure 32 、 Figure 33

[0245] Figure 34 The field curvature curve of embodiment 5 is shown, which represents the curvature of meridional image surface and sagittal image surface of light rays of different wavelengths, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.09mm~0.05mm, which shows that the optical lens can well correct the field curvature.

[0246] Figure 35 The F-Theta distortion curve of embodiment 5 is shown, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -4%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0247] Figure 36 The relative illumination curve of embodiment 5 is shown, which represents the relative illumination value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 50% at the maximum half field angle, which shows that the optical lens has good relative illumination.

[0248] Figure 37 ​The MTF (Modulation Transfer Function) curve of the embodiment 5 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0249] Figure 38 The axial aberration curve of the embodiment 5 is shown, which represents the aberration of the optical axis at the imaging surface at each wavelength, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the shift amount of the axial aberration is controlled within-5 μm-25 μm, which indicates that the optical lens can better correct the axial aberration.

[0250] Figure 39 The curve of the embodiment 5 is shown, which represents the color difference of different image heights on the imaging surface at each wavelength relative to the center wavelength (0.55 μm), the horizontal axis represents the vertical color difference value (unit: μm) of each wavelength relative to the center wavelength, and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical color difference of the longest wavelength and the shortest wavelength is controlled within-3 μm-6 μm, which indicates that the optical lens can very well correct the color difference of the edge field of view and the secondary spectrum of the entire image surface.

[0251] Embodiment 6

[0252] Please refer to Figure 40 , which is a structural schematic diagram of the optical lens provided in the embodiment 6 of the present application, which comprises, 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 stop 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.

[0253] The first lens L1 has a negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface;

[0254] The second lens L2 has a negative focal power, and the object side S3 and the image side S4 are both concave surfaces;

[0255] The third lens L3 has a positive focal power, the object side S5 is a convex surface, and the image side S6 is a concave surface;

[0256] The stop ST;

[0257] The fourth lens L4 has a negative focal power, the object side S7 is a convex surface, and the image side S8 is a concave surface;

[0258] The fifth lens L5 has positive refractive power, and both the object side S8 and the image side S9 are convex surfaces;

[0259] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8;

[0260] The sixth lens L6 has positive refractive power, and the object side S10 is a convex surface, and the image side S11 is a concave surface;

[0261] The seventh lens L7 has positive refractive power, and the object side S12 is a convex surface, and the image side S13 is a concave surface;

[0262] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0263] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0264] The imaging surface S18 is a flat surface.

[0265] The related parameters of the lenses in the optical lens in Embodiment 6 are shown in Table 6-1.

[0266] Table 6-1

[0267]

[0268]

[0269] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 6 are shown in Table 6-2.

[0270] Table 6-2

[0271] Figure 41 K A B C D E F S12 -4.47E-01 0.00E+00 -1.41E-03 -1.57E-04 1.81E-05 -2.25E-06 7.69E-08 S13 1.00E+02 0.00E+00 -9.96E-04 -7.65E-05 -4.74E-08 -2.22E-07 1.65E-08

[0272] In this embodiment, the field curvature curve, the F-Theta distortion curve, the relative luminance curve, the MTF curve, the axial aberration curve, and the transverse chromatic aberration curve of the optical lens are shown in FIGS. Figure 42 、 Figure 37 、 Figure 38 、 Figure 39 、 Figure 40 、 Figure 41

[0273] Figure 42 The field curvature curve of Embodiment 6 is shown, which represents the curvature of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.04mm~0.12mm, which shows that the optical lens can well correct the field curvature. ​

[0274] Figure 43 F-Theta distortion curve of embodiment 6 is shown, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging plane, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -7%~0, the image compression in the edge angle region is relatively gentle, and the clarity of the expanded image is effectively improved.

[0275] Figure 44 The relative illumination curve of embodiment 6 is shown, which represents the relative illumination value of different field angles on the imaging plane, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 40% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0276] Figure 45 The MTF (Modulation Transfer Function) curve of embodiment 6 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.3 within the full field of view, and in the range of 0~160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution ability in low and high frequency conditions.

[0277] Figure 46 The axial aberration curve of embodiment 6 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within -5μm~20μm, indicating that the optical lens can better correct the axial aberration.

[0278] Figure 47 The sagittal chromatic aberration curve of embodiment 6 is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.55μm), the horizontal axis represents the sagittal chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2μm~4μm, indicating that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0279] Embodiment 7

[0280] Please refer to Figure 48Figure 7 shows a structural schematic diagram of an optical lens provided in Embodiment 7 of the present application. Compared with Embodiment 3, the main difference is that the radius of curvature, lens thickness and other optical parameters of the lens surface are different.

[0281] The related parameters of the lenses in the optical lens in Embodiment 7 are shown in Table 7-1.

[0282] Table 7-1

[0283]

[0284]

[0285] The surface type parameters of the aspherical lens of the optical lens in Embodiment 7 are shown in Table 7-2.

[0286] Table 7-2

[0287] Figure 44 K A B C D E F S13 -5.93E-01 0.00E+00 -1.33E-03 7.83E-05 -4.17E-05 2.93E-06 -6.26E-08 S14 -2.13E+00 0.00E+00 8.43E-04 1.17E-05 -3.65E-05 3.12E-06 -7.48E-08

[0288] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve and transverse chromatic aberration curve of the optical lens are shown in Figures Figure 45 、 Figure 46 、 Figure 47 、 Figure 48 、 Figure 49 、 Figure 50 respectively.

[0289] Figure 51 Figure 7 shows the field curvature curve of Embodiment 7, which represents the curvature of the meridional image surface and sagittal image surface of light rays of different wavelengths, and the horizontal axis represents the offset (unit: mm) and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.1mm-0.12mm, which indicates that the optical lens can well correct the field curvature.

[0290] Figure 52 Figure 7 shows the F-Theta distortion curve of Embodiment 7, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, and the horizontal axis represents the F-Theta distortion (unit: %) and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -7%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0291] Figure 53The relative luminance curve of the embodiment 7 is shown, which represents the relative luminance values of different field angles on the imaging plane, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative luminance (unit: %). As can be seen from the figure, the relative luminance value of the optical lens is still greater than 40% at the maximum half field angle, which indicates that the optical lens has good relative luminance.

[0292] Figure 54 The MTF (modulation transfer function) curve of the embodiment 7 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.3 within the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0293] Figure 55 The axial aberration curve of the embodiment 7 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-20 μm-10 μm, which indicates that the optical lens can better correct the axial aberration.

[0294] Figure 56 The axial aberration curve of the embodiment 7 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-20 μm-10 μm, which indicates that the optical lens can better correct the axial aberration.

[0295] Embodiment 8

[0296] Please refer to Figure 51 , which is a structural schematic diagram of the optical lens provided in the embodiment 8 of the present application. Compared with the embodiment 3, the main difference between the embodiment 8 and the embodiment 3 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0297] The related parameters of each lens in the optical lens in the embodiment 8 are shown in Table 8-1.

[0298] Table 8-1

[0299]

[0300]

[0301] The surface parameters of the aspherical lens of the optical lens in Embodiment 8 are shown in Table 8-2.

[0302] Table 8-2

[0303] Figure 52 K A B C D E F S13 1.74E+00 0.00E+00 -2.21E-03 1.84E-05 -4.13E-05 3.23E-06 -7.62E-08 S14 2.79E+00 0.00E+00 2.19E-04 -7.97E-05 -2.65E-05 2.77E-06 -7.08E-08

[0304] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and transverse aberration curve of the optical lens are shown in FIGS. 8-2, 8-3, 8-4, 8-5, 8-6, and 8-7, respectively. Figure 53 Figure 54 Figure 55 Figure 56 ​ ​

[0305] ​ FIG. 8-2 shows the field curvature curve of Embodiment 8, which represents the curvature of the meridional image surface and sagittal image surface of light rays of different wavelengths, with the horizontal axis representing the offset (unit: mm) and the vertical axis representing the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.08 mm-0.08 mm, which indicates that the optical lens can well correct the field curvature.

[0306] ​ FIG. 8-3 shows the F-Theta distortion curve of Embodiment 8, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, with the horizontal axis representing the F-Theta distortion (unit: %) and the vertical axis representing the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -6%-0, and the image compression in the edge angle region is relatively flat, which effectively improves the clarity of the expanded image.

[0307] ​ FIG. 8-4 shows the relative illumination curve of Embodiment 8, which represents the relative illumination value of different field angles on the imaging surface, with the horizontal axis representing the half field angle (unit: °) and the vertical axis representing the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 40% at the maximum half field angle, which indicates that the optical lens has good relative illumination.

[0308] ​ FIG. 8-5 shows the MTF (Modulation Transfer Function) curve of Embodiment 8, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, with the horizontal axis representing the spatial frequency (unit: lp / mm) and the vertical axis representing the MTF value. As can be seen from the figure, the MTF value of this embodiment is above 0.3 within the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, which has good imaging quality and good detail resolution ability in both low and high frequency cases. ​​​​​​

[0309] ​ Figure 8 shows the axial aberration curve of the optical lens of Example 8, which represents the aberration of the optical axis at the imaging plane at each wavelength, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the shift of the axial aberration is controlled within -20 μm ~ 15 μm, which indicates that the optical lens can correct the axial aberration well.

[0310] ​ Figure 9 shows the sagittal chromatic aberration curve of the optical lens of Example 8, which represents the chromatic aberration at different image heights on the imaging plane at each wavelength relative to the central wavelength (0.55 μm), the horizontal axis represents the sagittal chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -6 μm ~ 6 μm, which indicates that the optical lens can correct the chromatic aberration of the edge field and the secondary spectrum of the entire image plane very well.

[0311] Table 9 shows the optical properties of the above-mentioned embodiments, including the effective focal length f, the total track length TTL, the aperture value FNO, the real image height IH, and the maximum field angle FOV of the optical lens, and the numerical values corresponding to each conditional expression in the embodiments.

[0312] Table 9

[0313]

[0314]

[0315] In summary of the above embodiments, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces the aberration, and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of the optical power.

[0316] 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 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.

[0317] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, whose object side surface is a convex surface and whose image side surface is a concave surface; a second lens with negative refractive power, whose image side surface is a concave surface; a third lens with positive refractive power, whose object side surface is a convex surface; a fourth lens with negative refractive power, whose image side surface is a concave surface; a fifth lens with positive refractive power, whose object side surface and image side surface are both convex surfaces; a sixth lens with positive refractive power, whose object side surface is a convex surface; a seventh lens with positive refractive power; a maximum field of view FOV of the optical lens and an aperture value FNO satisfy: 85°<FOV / FNO<130°; an effective focal length f of the optical lens and a focal length f7 of the seventh lens satisfy: 5.0<f7 / f<50.

0.

2. The optical lens of claim 1, wherein, a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 0.5<(R3+R4) / (R3-R4)<3.

0.

3. The optical lens of claim 1, wherein, a curvature radius R5 of the object side surface of the third lens and a curvature radius R6 of the image side surface of the third lens satisfy: -6.0<(R5+R6) / (R5-R6)<57.

0.

4. The optical lens of claim 1, wherein, an optical total track length TTL of the optical lens and the effective focal length f satisfy: 8.5<TTL / f<10.

0.

5. The optical lens of claim 1, wherein, an optical total track length TTL of the optical lens and a real image height IH corresponding to the maximum field of view angle satisfy: 2.8<TTL / IH<3.

5.

6. The optical lens of claim 1, wherein, the effective focal length f of the optical lens, an arc θ of the maximum half field of view angle, and a real image height IH corresponding to the maximum field of view angle satisfy: 0.8<(IH / 2) / (f×θ)<1.

0.

7. The optical lens of claim 1, wherein, an optical back focal length BFL of the optical lens and the effective focal length f satisfy: 1.0<BFL / f<2.

0.

8. The optical lens of claim 1, wherein, a real image height IH corresponding to the maximum field of view angle of the optical lens and an entrance pupil diameter EPD satisfy: 4.0<IH / EPD<6.

0.

9. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: -7.5<f1 / f<-2.

5.

10. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and a focal length f2 of the second lens satisfy: -4.0<f2 / f<-2.0.

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