Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses arranged along an optical axis from an object side to an imaging surface in sequence: a first lens with negative focal 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 focal power; a third lens with positive focal power; a diaphragm; a fourth lens with positive focal power, the object side surface and the image side surface of which are both convex surfaces; a fifth lens with positive focal power, the object side surface and the image side surface of which are both convex surfaces; a sixth lens with negative focal power, the object side surface and the image side surface of which are both concave surfaces; and a seventh lens with positive focal power, the object side surface of which is a concave surface and the image side surface of which is a convex surface; wherein the effective focal length f of the optical lens, the maximum field of view FOV and the real image height IH corresponding to the maximum field of view FOV satisfy the condition: 0.85<(IH / 2) / (f*tan(FOV / 2))<0.95. The optical lens has high resolving power, good imaging quality and clear edge field of view imaging through reasonable configuration of the surface shapes of the lenses and reasonable matching of the focal powers.

Description

TECHNICAL FIELD

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

[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are used more and more in intelligent driving, and the position of vehicle optical lenses in the automobile industry is continuously improved.

[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving, which collects environmental information through various lenses combined with sensors to ensure the safety of drivers. The surround view lens of the existing ADAS system has poor imaging quality at the edge of the field of view, and cannot clearly distinguish obstacles. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens which has the advantage of good edge field of view imaging effect.

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

[0006] The first lens has negative focal power, the object side surface is convex, and the image side surface is concave;

[0007] The second lens has negative focal power;

[0008] The third lens has positive focal power;

[0009] The stop;

[0010] The fourth lens has positive focal power, both the object side surface and the image side surface are convex;

[0011] The fifth lens has positive focal power, both the object side surface and the image side surface are convex;

[0012] The sixth lens has negative focal power, both the object side surface and the image side surface are concave;

[0013] The seventh lens has positive focal power, the object side surface is concave, and the image side surface is convex;

[0014] The effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view FOV satisfy: 0.85<(IH / 2) / (fxtan(FOV / 2))<0.95.

[0015] Further preferably, the real image height IH corresponding to the maximum field of view FOV and the real image height IHθ corresponding to the half field of view angle satisfy: 0.42<IHθ / IH<0.48.

[0016] It is further preferred that the total track length TTL of the optical lens and the effective focal length f satisfy: 6.0 < TTL / f < 8.0.

[0017] It is further preferred that the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 40 < FOV / FNO < 55.

[0018] It is further preferred that the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 1.7 < IH / f < 1.8.

[0019] It is further preferred that the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view and the clear aperture D1 of the first lens object side satisfy: 1.5 < D1 / IH / tan(FOV / 2) < 1.9.

[0020] It is further preferred that the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side satisfy: -0.8 < R7 / R8 < -0.6.

[0021] It is further preferred that the curvature radius R 13 of the object side of the seventh lens and the curvature radius R 14 of the image side satisfy: 1.0 < R 13 / R 14 < 2.5.

[0022] It is further preferred that the sagittal height Sag7 of the object side clear aperture half of the fourth lens and the object side clear aperture half d7 of the fourth lens satisfy: 0.2 < Sag7 / d7 < 0.4.

[0023] It is further preferred that the sagittal height Sag8 of the image side clear aperture half of the fourth lens and the image side clear aperture half d8 of the fourth lens satisfy: -0.2 < Sag8 / d8 < -0.05.

[0024] It is further preferred that the sagittal height Sag 13 of the object side clear aperture half of the seventh lens and the object side clear aperture half d 13 of the seventh lens satisfy: -0.4 < Sag 13 / d 13 < -0.1.

[0025] It is further preferred that the sagittal height Sag 14 of the image side clear aperture half of the seventh lens and the image side clear aperture half d 14 of the seventh lens satisfy: -0.4 < Sag 14 / d 14 < -0.1.

[0026] The optical lens provided by the present application has high resolving power and good imaging quality by reasonable configuration of each lens surface and reasonable matching of optical power. BRIEF DESCRIPTION OF DRAWINGS

[0027] 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:

[0028] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0029] Figure 2 FIG. 2 is a field curvature curve of the optical lens according to the embodiment of the present application.

[0030] Figure 3 FIG. 3 is an F-Tanθ distortion curve of the optical lens according to the embodiment of the present application.

[0031] Figure 4 FIG. 4 is a relative luminance curve of the optical lens according to the embodiment of the present application.

[0032] Figure 5 FIG. 5 is an MTF curve of the optical lens according to the embodiment of the present application.

[0033] Figure 6 FIG. 6 is an axial aberration curve of the optical lens according to the embodiment of the present application.

[0034] Figure 7 FIG. 7 is a lateral chromatic aberration curve of the optical lens according to the embodiment of the present application.

[0035] Figure 8 FIG. 8 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0036] Figure 9 FIG. 9 is a field curvature curve of the optical lens according to the embodiment of the present application.

[0037] Figure 10 FIG. 10 is an F-Tanθ distortion curve of the optical lens according to the embodiment of the present application.

[0038] Figure 11 FIG. 11 is a relative luminance curve of the optical lens according to the embodiment of the present application.

[0039] Figure 12 FIG. 12 is an MTF curve of the optical lens according to the embodiment of the present application.

[0040] Figure 13 FIG. 13 is an axial aberration curve of the optical lens according to the embodiment of the present application.

[0041] Figure 14The vertical axis chromatic aberration curve of the optical lens in the embodiment 2 of the present application.

[0042] Figure 15 The structural schematic diagram of the optical lens in the embodiment 3 of the present application.

[0043] Figure 16 The field curvature curve of the optical lens in the embodiment 3 of the present application.

[0044] Figure 17 The F-Tanθ distortion curve of the optical lens in the embodiment 3 of the present application.

[0045] Figure 18 The relative luminance curve of the optical lens in the embodiment 3 of the present application.

[0046] Figure 19 The MTF curve of the optical lens in the embodiment 3 of the present application.

[0047] Figure 20 The axial aberration curve of the optical lens in the embodiment 3 of the present application.

[0048] Figure 21 The vertical axis chromatic aberration curve of the optical lens in the embodiment 3 of the present application.

[0049] Figure 22 The structural schematic diagram of the optical lens in the embodiment 4 of the present application.

[0050] Figure 23 The field curvature curve of the optical lens in the embodiment 4 of the present application.

[0051] Figure 24 The F-Tanθ distortion curve of the optical lens in the embodiment 4 of the present application.

[0052] Figure 25 The relative luminance curve of the optical lens in the embodiment 4 of the present application.

[0053] Figure 26 The MTF curve of the optical lens in the embodiment 4 of the present application.

[0054] Figure 27 The axial aberration curve of the optical lens in the embodiment 4 of the present application.

[0055] Figure 28 The vertical axis chromatic aberration curve of the optical lens in the embodiment 4 of the present application.

[0056] Figure 29 The structural schematic diagram of the optical lens in the embodiment 5 of the present application.

[0057] Figure 30 The field curvature curve of the optical lens in the embodiment 5 of the present application.

[0058] Figure 31 F-Tan Theta Distortion curve of the optical lens according to Embodiment 5 of the present application.

[0059] Figure 32 Relative Illumination curve of the optical lens according to Embodiment 5 of the present application.

[0060] Figure 33 MTF curve of the optical lens according to Embodiment 5 of the present application.

[0061] Figure 34 Axial Distortion curve of the optical lens according to Embodiment 5 of the present application.

[0062] Figure 35 Vignetting curve of the optical lens according to Embodiment 5 of the present application.

[0063] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION

[0064] For a better understanding of the present application, various aspects of the present application will be described in relation to the annexed drawings. It is stressed that these detailed descriptions are only descriptions of embodiments of the present application and are not meant in any way to limit the scope of the present application. Throughout the description, 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.

[0065] It is noted that, in this specification, the expressions first, second, third, etc. are merely used to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0066] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0067] In this specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0068] It should also be understood that the use of the terms "including", "including having", "having", "containing", and / or "containing having" when used in this specification intends that existence of stated features, elements and / or components but does not exclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when phrases such as "at least one of" appear after a listing of items, the phrase is intended to be interpreted to mean that any of the listed items can be present, individually or in combination, and that the combinations are also part of the disclosure. Furthermore, when describing embodiments of the present application, the use of "may" 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.

[0069] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0070] 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 combination with the embodiments.

[0071] The optical lens according to the embodiments of the present application sequentially comprises, along the optical axis from the object side to the image side: 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.

[0072] In some embodiments, the first lens can have a negative focal power, the object side surface of which is convex, and the image side surface of which is concave; the second lens can have a negative focal power; the third lens can have a positive focal power; the fourth lens can have a positive focal power, both the object side surface and the image side surface of which are convex; the fifth lens can have a positive focal power, both the object side surface and the image side surface of which are convex; the sixth lens can have a negative focal power, both the object side surface and the image side surface of which are concave; and the seventh lens can have a positive focal power, the object side surface of which is concave, and the image side surface of which is convex.

[0073] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.0 < f1 / f < -1.5. Satisfying the above requirement can make the first lens have a proper negative focal power, which is conducive to reducing the inclination angle of the incident light, thereby reducing the difficulty of correcting various aberrations of the optical lens.

[0074] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -22.0 < f2 / f < -2.0. Satisfying the above requirement, the second lens can have appropriate negative refractive power, share the negative refractive power of the front end of the optical lens, thereby avoiding excessive deflection of light caused by the first lens, and reducing the difficulty of chromatic aberration correction of the optical lens.

[0075] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 3.0 < f3 / f < 10.0. Satisfying the above requirement, the third lens can have appropriate positive refractive power, reduce the light deflection angle while converging light, smoothly transition the light trend, balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.

[0076] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < f4 / f < 2.5. Satisfying the above requirement, the fourth lens can have appropriate positive refractive power, reduce the light deflection angle while converging light, smoothly transition the light trend, balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.

[0077] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5 < f5 / f < 2.0. Satisfying the above requirement, the fifth lens can have appropriate positive refractive power, reduce the light deflection angle while converging light, smoothly transition the light trend, balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.

[0078] 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 < -0.5. Satisfying the above requirement, the sixth lens can have appropriate negative refractive power, increase the imaging area of the optical lens, and optimize the chromatic aberration of the optical lens to improve the imaging quality of the optical lens.

[0079] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 5.0 < f7 / f < 10.0. Satisfying the above range, the seventh lens can have appropriate positive refractive power, improve the light converging ability of the optical lens, and shorten the total length of the optical lens. At the same time, the spherical aberration of the optical lens is also optimized, and the imaging quality of the optical lens is improved.

[0080] In some embodiments, the fifth lens and the sixth lens can be cemented together to form a cemented lens, which can effectively correct chromatic aberration of the optical lens, reduce sensitivity of the optical lens to decentration, balance aberration of the optical lens, and improve imaging quality of the optical lens; and can also reduce assembly sensitivity of the optical lens, thereby reducing process difficulty of the optical lens and improving assembly yield of the optical lens.

[0081] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view FOV satisfy: 0.85<(IH / 2) / (fxtan(FOV / 2))<0.95. Satisfying the above requirement indicates that optical distortion of the optical lens is better controlled, resolution of the optical lens is improved, special distortion specifications are reached, edge field of view occupies a larger proportion in the entire imaging picture, and edge imaging of the field of view is clearer.

[0082] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the real image height IHθ corresponding to the half field of view satisfy: 0.42<IHθ / IH<0.48. Satisfying the above requirement reaches special distortion specifications, ensures that the edge field of view occupies a larger proportion in the entire imaging picture, and makes the edge imaging of the field of view clearer.

[0083] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f satisfy: 6.0<TTL / f<8.0. Satisfying the above requirement ensures that there is enough space to adjust the lens structure and optimize the imaging effect.

[0084] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 40<FOV / FNO<55. Satisfying the above requirement makes the aperture value match the field of view. This is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, conducive to the optical lens obtaining more scene information, meeting the demand for large-range detection, and implementation of the large-aperture feature being conducive to improving the problem that the relative brightness of the edge field of view decreases rapidly, thereby also being conducive to obtaining more scene information.

[0085] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface satisfy: -0.8<R7 / R8<-0.6. Satisfying the above requirement can reduce various aberrations generated by the fourth lens itself and improve the imaging quality of the optical lens.

[0086] In some embodiments, the curvature radius R 13 of the object side surface of the seventh lens and the curvature radius R 14 of the image side surface satisfy: 1.0<R 13 / R 14<2.5. The above requirements can reduce various aberrations generated by the seventh lens itself, improve the imaging quality of the optical lens, and ensure the meniscus shape to form special distortion and improve the imaging effect at the edge of the field of view.

[0087] In some embodiments, the second lens, the fourth lens, and the seventh lens can all adopt the surface shape of an aspherical lens to improve the resolution quality.

[0088] In some embodiments, the sagittal height of the object-side half light entrance aperture of the fourth lens Sag7 and the object-side half light entrance aperture d7 of the fourth lens satisfy 0.2 < Sag7 / d7 < 0.4, and the sagittal height of the image-side half light entrance aperture of the fourth lens Sag8 and the image-side half light entrance aperture d8 of the fourth lens satisfy -0.2 < Sag8 / d8 < -0.05. The above requirements can optimize various aberrations and improve the imaging quality of the optical lens.

[0089] In some embodiments, the sagittal height of the object-side half light entrance aperture of the seventh lens Sag 13 and the object-side half light entrance aperture d 13 of the seventh lens satisfy -0.4 < Sag 13 / d 13 < -0.1. The sagittal height of the image-side half light entrance aperture of the seventh lens Sag 14 and the image-side half light entrance aperture d 14 of the seventh lens satisfy -0.4 < Sag 14 / d 14 < -0.1. The above requirements can ensure the meniscus shape of the seventh lens to form special distortion and improve the imaging effect at the edge of the field of view.

[0090] In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view angle satisfy 1.7 < IH / f < 1.8. The above range can realize large image surface characteristics and improve the imaging quality of the optical lens.

[0091] In some embodiments, the maximum field of view angle FOV of the optical lens, the real image height IH corresponding to the maximum field of view angle, and the light entrance aperture D1 of the object-side surface of the first lens satisfy 1.5 < D1 / IH / tan(FOV / 2) < 1.9. The above range can ensure the balance between the size of the optical lens and the large field of view angle and large image surface.

[0092] To make the system have better optical performance, multiple aspherical lenses are used in the lens, and the shape of each aspherical surface of the optical lens satisfies the following equation:

[0093]

[0094] 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, A, B, C, D, E, F are the second order, fourth order, sixth order, eighth order, tenth order, twelfth order curved surface coefficients respectively.

[0095] 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 change, substitution, combination or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and all are included in the protection scope of the application.

[0096] Embodiment 1

[0097] Please refer to Figure 1 , which is the structural schematic diagram of the optical lens provided in the embodiment 1 of the application, the optical lens comprises in sequence from the object side to the imaging surface along the optical axis: the first lens L1, the second lens L2, the third lens L3, the diaphragm ST, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the filter G1 and the protective glass G2.

[0098] The first lens L1 has negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface;

[0099] The second lens L2 has negative focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface;

[0100] The third lens L3 has positive focal power, the object side S5 is a concave surface, and the image side S6 is a convex surface;

[0101] The diaphragm ST;

[0102] The fourth lens L4 has positive focal power, the object side S7 and the image side S8 are both convex surfaces;

[0103] The fifth lens L5 has positive focal power, the object side S9 and the image side S10 are both convex surfaces;

[0104] The sixth lens L6 has negative focal power, the object side S10 and the image side S11 are both concave surfaces;

[0105] The fifth lens L5 and the sixth lens L6 constitute a cemented lens group, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens L6 is S10;

[0106] The seventh lens L7 has positive focal power, the object side S12 is a concave surface, and the image side S13 is a convex surface;

[0107] The object side S14 and the image side S15 of the filter G1 are both planar;

[0108] The object side S16 and the image side S17 of the protective glass G2 are both planar;

[0109] The imaging surface S18 is planar.

[0110] The related parameters of each lens in the optical lens in Embodiment 1 are shown in Table 1-1.

[0111] Table 1-1

[0112]

[0113] The surface type parameters of the aspherical lens of the optical lens in Embodiment 1 are shown in Table 1-2.

[0114] Table 1-2

[0115] Surface number K A B C D E F S3 -2.16E+00 0.00E+00 3.66E-04 -1.01E-05 7.13E-07 -2.66E-08 5.36E-10 S4 -7.86E+00 0.00E+00 6.15E-06 3.20E-06 1.18E-08 -9.81E-11 -5.70E-11 S7 -3.09E-01 0.00E+00 5.87E-04 -7.30E-07 1.62E-06 -1.21E-07 4.33E-09 S8 -5.23E-01 0.00E+00 7.88E-04 -1.54E-05 2.78E-06 -2.13E-07 7.37E-09 S12 1.07E+00 0.00E+00 2.38E-03 3.08E-05 -8.82E-06 4.06E-07 -4.36E-09 S13 -2.32E+00 0.00E+00 8.67E-04 2.96E-05 -3.78E-06 5.20E-08 2.04E-09

[0116] In this embodiment, the field curvature curve, the F-Tanθ 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 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7

[0117] Figure 2 The field curvature curve of Embodiment 1 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: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.02mm~0.05mm, which shows that the optical lens can well correct the field curvature.

[0118] Figure 3 The F-Tanθ distortion curve of Embodiment 1 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within-10%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0119] Figure 4 ​The relative luminance curve of the embodiment 1 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 60% at the maximum half field angle, which indicates that the optical lens has good relative luminance.

[0120] Figure 5 The MTF (modulation transfer function) curve of the embodiment 1 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 ability in the case of low frequency and high frequency.

[0121] Figure 6 The axial aberration curve of the embodiment 1 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 shift amount of the axial aberration is controlled within-26 μm-15 μm, which indicates that the optical lens can better correct the axial aberration.

[0122] Figure 7 The axial aberration curve of the embodiment 1 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 shift amount of the axial aberration is controlled within-26 μm-15 μm, which indicates that the optical lens can better correct the axial aberration.

[0123] Embodiment 2

[0124] Please refer to Figure 8 , which is a structural schematic diagram of the optical lens provided in the embodiment 2 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.

[0125] 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;

[0126] The second lens L2 has a negative focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface;

[0127] The third lens L3 has positive refractive power, and both the object side S5 and the image side S6 are convex surfaces;

[0128] The diaphragm ST;

[0129] The fourth lens L4 has positive refractive power, and both the object side S7 and the image side S8 are convex surfaces;

[0130] The fifth lens L5 has positive refractive power, and both the object side S9 and the image side S10 are convex surfaces;

[0131] The sixth lens L6 has negative refractive power, and both the object side S10 and the image side S11 are concave surfaces;

[0132] The fifth lens L5 and the sixth lens L6 constitute a cemented lens group, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens L6 is S10;

[0133] The seventh lens L7 has positive refractive power, and the object side S12 is a concave surface, and the image side S13 is a convex surface;

[0134] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0135] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0136] The imaging surface S18 is a flat surface.

[0137] The related parameters of the lenses in the optical lens in Embodiment 2 are shown in Table 2-1.

[0138] Table 2-1

[0139]

[0140]

[0141] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 2 are shown in Table 2-2.

[0142] Table 2-2

[0143] Surface number K A B C D E F S3 -1.67E+00 0.00E+00 4.19E-04 -7.82E-06 4.17E-07 -1.41E-08 2.37E-10 S4 -8.13E+00 0.00E+00 6.77E-05 4.81E-06 -3.79E-08 -2.33E-11 -7.85E-13 S7 -4.81E-01 0.00E+00 5.38E-04 -1.05E-05 1.82E-06 -1.20E-07 8.98E-10 S8 4.91E-02 0.00E+00 7.25E-04 -2.59E-05 2.43E-06 -2.08E-07 3.09E-09 S12 5.78E-01 0.00E+00 1.78E-03 3.06E-05 -1.20E-05 5.87E-07 -2.18E-08 S13 -2.23E+00 0.00E+00 1.02E-04 8.85E-06 -3.14E-06 1.01E-08 1.86E-09

[0144] In this embodiment, the field curvature curve, the F-Tanθ 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 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14

[0145] ​Figure 9 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 -0.03mm~0.05mm, which shows that the optical lens can well correct the field curvature.

[0146] Figure 10 The F-Tanθ distortion curve of Example 2 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within -10%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0147] Figure 11 The relative luminance curve of Example 2 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 60% at the maximum half field angle, which shows that the optical lens has good relative luminance.

[0148] Figure 12 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 0.4 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.

[0149] Figure 13 The axial aberration curve of Example 2 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 -20μm~10μm, which shows that the optical lens can well correct the axial aberration.

[0150] Figure 14The vertical axis represents the value of the vertical color aberration of each wavelength relative to the central wavelength (0.55 μm) (unit: μm), and the horizontal 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 -1 μm-6 μm, which indicates that the optical lens can correct the color aberration of the edge field and the secondary spectrum of the whole image plane very well.

[0151] Embodiment 3

[0152] Referring to Figure 15 , which is a structural schematic diagram of the optical lens provided in Embodiment 3 of the present application. The optical lens 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 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.

[0153] 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;

[0154] The second lens L2 has a negative focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface;

[0155] 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;

[0156] The diaphragm ST;

[0157] The fourth lens L4 has a positive focal power, and both the object side S7 and the image side S8 are convex surfaces;

[0158] The fifth lens L5 has a positive focal power, and both the object side S9 and the image side S10 are convex surfaces;

[0159] The sixth lens L6 has a negative focal power, and both the object side S10 and the image side S11 are concave surfaces;

[0160] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens L6 is S10;

[0161] The seventh lens L7 has a positive focal power, the object side S12 is a concave surface, and the image side S13 is a convex surface;

[0162] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0163] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0164] The imaging plane S18 is a flat surface.

[0165] The related parameters of each lens in the optical lens in embodiment 3 are shown in Table 3-1.

[0166] Table 3-1

[0167]

[0168]

[0169] The surface type parameters of the aspherical lens of the optical lens in embodiment 3 are shown in Table 3-2.

[0170] Table 3-2

[0171] Surface number K A B C D E F S3 -1.61E+00 0.00E+00 5.46E-04 -3.52E-06 5.68E-07 -1.61E-08 -1.00E-10 S4 -8.21E+00 0.00E+00 1.26E-04 1.49E-05 -1.12E-06 7.82E-08 -2.28E-09 S7 -1.10E+00 0.00E+00 5.71E-04 4.36E-05 -2.15E-06 4.27E-07 -1.53E-08 S8 -5.30E+00 0.00E+00 3.21E-04 2.65E-05 9.58E-06 -7.87E-07 5.21E-08 S12 -3.02E+01 0.00E+00 -2.20E-03 -9.73E-05 5.65E-06 -9.41E-07 3.80E-08 S13 8.71E-01 0.00E+00 -6.44E-04 -6.64E-05 4.12E-06 -3.05E-07 1.18E-08

[0172] In this embodiment, the field curvature curve, F-Tanθ distortion curve, relative illumination curve, MTF curve, axial aberration curve and transverse chromatic aberration curve of the optical lens are shown in FIGS. 3-1 to 3-6 respectively. Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21

[0173] Figure 16 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 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-0.03mm~0.05mm, which shows that the optical lens can well correct the field curvature.

[0174] Figure 17 The F-Tanθ distortion curve of embodiment 3 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ 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.

[0175] Figure 18 The relative illumination curve of embodiment 3 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: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 60% at the maximum half field angle, which shows that the optical lens has good relative illumination.

[0176] Figure 19 ​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. 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.

[0177] Figure 20 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. It can be seen from the figure that the shift amount of the axial aberration is controlled within ±20 μm, which indicates that the optical lens can better correct the axial aberration.

[0178] Figure 21 The 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. It can be seen from the figure that the shift amount of the axial aberration is controlled within ±20 μm, which indicates that the optical lens can better correct the axial aberration.

[0179] Embodiment 4

[0180] Please refer to Figure 22 , 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.

[0181] 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;

[0182] The second lens L2 has a negative focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface;

[0183] 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;

[0184] The stop ST;

[0185] The fourth lens L4 has a positive focal power, and the object side S7 and the image side S8 are both convex surfaces;

[0186] The fifth lens L5 has positive refractive power, and both the object side S9 and the image side S10 are convex surfaces;

[0187] The sixth lens L6 has negative refractive power, and both the object side S10 and the image side S11 are concave surfaces;

[0188] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens L6 is S10;

[0189] The seventh lens L7 has positive refractive power, and the object side S12 is a concave surface, and the image side S13 is a convex surface;

[0190] Both the object side S14 and the image side S15 of the filter G1 are flat surfaces;

[0191] Both the object side S16 and the image side S17 of the protective glass G2 are flat surfaces;

[0192] The imaging surface S18 is a flat surface.

[0193] The related parameters of each lens in the optical lens in Embodiment 4 are shown in Table 4-1.

[0194] Table 4-1

[0195]

[0196] The surface type parameters of the aspherical lens of the optical lens in Embodiment 4 are shown in Table 4-2.

[0197] Table 4-2

[0198] Surface number K A B C D E F S3 -2.04E+00 0.00E+00 6.38E-04 -7.74E-07 2.42E-07 -2.88E-09 -1.84E-10 S4 -1.16E+01 0.00E+00 2.19E-04 2.07E-05 -1.24E-06 6.39E-08 -1.42E-09 S7 -1.23E+00 0.00E+00 4.60E-04 3.26E-05 -4.10E-06 4.57E-07 -1.36E-08 S8 -4.36E+00 0.00E+00 1.04E-04 -6.90E-06 9.44E-06 -7.73E-07 3.33E-08 S12 -1.97E+01 0.00E+00 -2.34E-03 -1.05E-04 4.33E-06 -9.00E-07 5.24E-08 S13 5.85E+00 0.00E+00 -1.27E-03 -5.80E-05 4.43E-06 -3.44E-07 1.67E-08

[0199] In this embodiment, the field curvature curve, F-Tanθ distortion curve, relative luminance curve, MTF curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens are shown in FIGS. Figure 23 、 Figure 24 、 Figure 25 、 Figure 26 、 Figure 27 、 Figure 28

[0200] Figure 23 The field curvature curve of Embodiment 4 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: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which shows that the optical lens can well correct the field curvature.

[0201] Figure 24 ​F-Tanθ distortion curve of embodiment 4 is shown, which represents F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging plane, the horizontal axis represents F-Tanθ distortion (unit: %), and the vertical axis represents half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within -11%~0, the image compression in the edge angle region is relatively gentle, and the clarity of the expanded image is effectively improved.

[0202] Figure 25 The relative illumination curve of embodiment 4 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 60% at the maximum half field angle, which indicates that the optical lens has good relative illumination.

[0203] Figure 26 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 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.

[0204] Figure 27 The axial aberration curve of embodiment 4 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 -15 μm~30 μm, which indicates that the optical lens can better correct the axial aberration.

[0205] Figure 28 The vertical axis chromatic aberration curve of embodiment 4 is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging plane relative to the center wavelength (0.55 μm), the horizontal axis represents the vertical axis chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within 0~9 μm, which indicates 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.

[0206] Embodiment 5

[0207] Please refer to Figure 29Figure 5 shows a structural schematic diagram of an optical lens provided in Embodiment 5 of the present application, which comprises, along an optical axis from an object side to an 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.

[0208] The first lens L1 has a negative focal power, and its object side S1 is a convex surface and its image side S2 is a concave surface.

[0209] The second lens L2 has a negative focal power, and its object side S3 is a convex surface and its image side S4 is a concave surface.

[0210] The third lens L3 has a positive focal power, and its object side S5 and its image side S6 are both convex surfaces.

[0211] The stop ST.

[0212] The fourth lens L4 has a positive focal power, and its object side S7 and its image side S8 are both convex surfaces.

[0213] The fifth lens L5 has a positive focal power, and its object side S9 and its image side S10 are both convex surfaces.

[0214] The sixth lens L6 has a negative focal power, and its object side S10 and its image side S11 are both concave surfaces.

[0215] The fifth lens L5 and the sixth lens L6 form a cemented lens group, and the cemented surface S10 is formed by the image side of the fifth lens L5 and the object side of the sixth lens L6.

[0216] The seventh lens L7 has a positive focal power, and its object side S12 is a concave surface and its image side S13 is a convex surface.

[0217] The object side S14 and the image side S15 of the filter G1 are both flat surfaces.

[0218] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces.

[0219] The imaging plane S18 is a flat surface.

[0220] The related parameters of the lenses in the optical lens in Embodiment 5 are shown in Table 5-1.

[0221] Table 5-1

[0222]

[0223] The surface type parameters of the aspheric lenses in the optical lens in Embodiment 5 are shown in Table 5-2.

[0224] Table 5-2

[0225] Surface number K A B C D E F S3 4.50E+01 0.00E+00 4.57E-04 -5.76E-05 2.63E-06 -6.70E-08 6.74E-10 S4 -4.77E+00 0.00E+00 2.92E-03 -1.79E-04 7.40E-06 -2.00E-07 2.36E-09 S7 -3.62E+00 0.00E+00 8.39E-04 5.04E-06 -3.32E-07 2.23E-08 -1.22E-10 S8 -5.38E+00 0.00E+00 2.98E-04 -7.50E-06 2.17E-06 -1.11E-07 3.03E-09 S12 -3.55E+01 0.00E+00 -8.11E-04 -2.94E-05 1.58E-07 -1.14E-07 4.19E-09 S13 -4.60E+01 0.00E+00 -6.33E-04 4.05E-06 -9.34E-07 -2.47E-09 8.30E-10

[0226] In the present embodiment, the field curvature curve, F-Tanθ distortion curve, relative illumination curve, MTF curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens are shown in FIGS. 1-5, respectively. Figure 30 、 Figure 31 、 Figure 32 、 Figure 33 、 Figure 34 、 Figure 35

[0227] Figure 30 The field curvature curve of Example 5 is shown, which represents the curvature of light rays of different wavelengths on the meridional image surface and 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 -0.05 mm-0.03 mm, which shows that the optical lens can well correct the field curvature.

[0228] Figure 31 The F-Tanθ distortion curve of Example 5 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within -13%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0229] Figure 32 The relative illumination curve of Example 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 70% at the maximum half field angle, which shows that the optical lens has good relative illumination.

[0230] Figure 33 The MTF (Modulation Transfer Function) curve of Example 5 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 0.4 within the full field of view, and within 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, and has good imaging quality and good detail resolution ability in low and high frequency cases.

[0231] Figure 34 ​Fig. 6 shows the axial aberration curve of the optical lens of Example 5, 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 -25 μm ~ 20 μm, which indicates that the optical lens can correct the axial aberration well.

[0232] Figure 35 Fig. 7 shows the sagittal chromatic aberration curve of the optical lens of Example 5, which represents the chromatic aberration of each wavelength at different image heights on the imaging plane 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 -3 μm ~ 9 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.

[0233] Referring to Table 6, the optical properties of the above-mentioned embodiments are shown, including the effective focal length f, the total optical 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 each embodiment.

[0234] Table 6

[0235]

[0236]

[0237] In summary of the above embodiments, the optical lens provided by the present application has high resolving power and good imaging quality by reasonable configuration of each lens surface and reasonable matching of optical power, and improves the imaging quality of the edge field, so that the edge field imaging is clear.

[0238] 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.

[0239] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging surface along the optical axis, there are 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; a third lens with positive refractive power; a diaphragm; a fourth lens with positive refractive power, whose object side surface and image side surface are both convex surfaces; a fifth lens with positive refractive power, whose object side surface and image side surface are both convex surfaces; a sixth lens with negative refractive power, whose object side surface and image side surface are both concave surfaces; a seventh lens with positive refractive power, whose object side surface is a concave surface and whose image side surface is a convex surface; The effective focal length f of the optical lens, the maximum field of view FOV and the real image height IH corresponding to the maximum field of view FOV satisfy: 0.85<(IH / 2) / (f×tan(FOV / 2))<0.

95. The total optical length TTL of the optical lens and the effective focal length f satisfy: 6.0<TTL / f<8.

0.

2. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field of view FOV and the real image height IHθ corresponding to the half field of view angle satisfy: 0.42<IHθ / IH<0.

48.

3. The optical lens of claim 1, wherein, The maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 40<FOV / FNO<55.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view FOV satisfy: 1.7<IH / f<1.

8.

5. The optical lens of claim 1, wherein, The maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view FOV and the clear aperture D1 of the object side surface of the first lens satisfy: 1.5<D1 / IH / tan(FOV / 2)<1.

9.

6. The optical lens of claim 1, wherein, The curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -0.8<R7 / R8<-0.

6.

7. The optical lens of claim 1, wherein, A radius of curvature R of an object side surface of the seventh lens 13 A radius of curvature R of an image side surface 14 1.0 < R 13 / R 14 < 2.

5.

8. The optical lens of claim 1, wherein, The sagittal height Sag7 of the object side surface of the fourth lens and the half clear aperture d7 of the object side surface of the fourth lens satisfy: 0.2<Sag7 / d7<0.4; the sagittal height Sag8 of the image side surface of the fourth lens and the half clear aperture d8 of the image side surface of the fourth lens satisfy: -0.2<Sag8 / d8<-0.

05.

9. The optical lens of claim 1, wherein, Sag of the seventh lens on the object side 13 d of the seventh lens on the object side 13 -0.4 < Sag 13 / d < 0.4 13 -0.1; Sag of the seventh lens on the image side 14 d of the seventh lens on the image side 14 -0.4 < Sag 14 / d < 0.4 14 -0.1.

Images