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 negative optical power; a fourth lens with positive optical power, wherein the object side surface and the image side surface of the fourth lens are both convex surfaces; a diaphragm; a fifth lens with negative optical power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; 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, wherein the object side surface of the seventh lens is a convex surface; and the image side surface curvature radius R8 of the fourth lens and the object side surface curvature radius R9 of the fifth lens satisfy: -7 < R8 / R9 < -1.6. 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 increasing demand for driving experience, vehicle-mounted application optical lenses are increasingly used in intelligent driving, and vehicle-mounted optical lenses are playing an increasingly important role in the automotive industry.

[0003] The panoramic surround view system sets up multiple surround view cameras around the vehicle that can cover all the field of view ranges around the vehicle, fuses the angles of view of the multiple cameras into a 360-degree overhead view of the vehicle body, and finally displays on the screen of the center console to allow the driver to 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 it also has no blind spots, which can improve the driver's comfortable control of the vehicle parking or passing through complex roads, effectively reducing the occurrence of scratching, collision, sinking and other accidents.

[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 and the like, and is difficult to meet the user's demand. 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 sequentially includes, 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 negative focal power;

[0010] a fourth lens with positive focal power, whose object side surface and image side surface are both convex;

[0011] a stop;

[0012] a fifth lens with negative focal power, whose object side surface is convex and whose image side surface is concave;

[0013] a sixth lens with positive focal power, whose object side surface is convex;

[0014] a seventh lens with positive focal power, whose object side surface is convex;

[0015] The image-side curvature radius R8 of the fourth lens and the object-side curvature radius R9 of the fifth lens satisfy: -7 < R8 / R9 < -1.6.

[0016] Further preferably, the combined focal length f of the first lens to the fourth lens satisfies: 2.0 < |f 14 and the combined focal length f of the fifth lens to the seventh lens satisfies: 2.0 < |f 57 | < 6.0. 14 57 | < 6.0.

[0017] Further preferably, the total track length TTL of the optical lens and the effective focal length f satisfy: 10.0 < TTL / f < 13.0.

[0018] Further preferably, the effective focal length f of the optical lens, the radian of the maximum half field angle θ, and the real image height IH corresponding to the maximum field angle satisfy: 0.9 < (IH / 2) / (f x θ) < 1.0.

[0019] Further preferably, the maximum field angle FOV of the optical lens and the aperture value FNO satisfy: 105° < FOV / FNO < 140°.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.0 < f1 / f < -2.5.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4.0 < f2 / f < -2.5.

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.0 < f4 / f < 5.0.

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -6.0 < f5 / f < -3.0.

[0024] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.0 < f6 / f < 2.5.

[0025] 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

[0026] 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:

[0027] ​Figure 1 Structure diagram of the optical lens in Embodiment 1 of the present application.

[0028] Figure 2 Field curvature curve of the optical lens in Embodiment 1 of the present application.

[0029] Figure 3 F-Theta distortion curve of the optical lens in Embodiment 1 of the present application.

[0030] Figure 4 Relative illumination curve of the optical lens in Embodiment 1 of the present application.

[0031] Figure 5 MTF curve of the optical lens in Embodiment 1 of the present application.

[0032] Figure 6 Axial aberration curve of the optical lens in Embodiment 1 of the present application.

[0033] Figure 7 Vignetting curve of the optical lens in Embodiment 1 of the present application.

[0034] Figure 8 Structure diagram of the optical lens in Embodiment 2 of the present application.

[0035] Figure 9 Field curvature curve of the optical lens in Embodiment 2 of the present application.

[0036] Figure 10 F-Theta distortion curve of the optical lens in Embodiment 2 of the present application.

[0037] Figure 11 Relative illumination curve of the optical lens in Embodiment 2 of the present application.

[0038] Figure 12 MTF curve of the optical lens in Embodiment 2 of the present application.

[0039] Figure 13 Axial aberration curve of the optical lens in Embodiment 2 of the present application.

[0040] Figure 14 Vignetting curve of the optical lens in Embodiment 2 of the present application.

[0041] Figure 15 Structure diagram of the optical lens in Embodiment 3 of the present application.

[0042] Figure 16 Field curvature curve of the optical lens in Embodiment 3 of the present application.

[0043] Figure 17F-Theta distortion curve of the optical lens in Embodiment 3 of the present application.

[0044] Figure 18 Relative illumination curve of the optical lens in Embodiment 3 of the present application.

[0045] Figure 19 MTF curve of the optical lens in Embodiment 3 of the present application.

[0046] Figure 20 Axial aberration curve of the optical lens in Embodiment 3 of the present application.

[0047] Figure 21 Transverse chromatic aberration curve of the optical lens in Embodiment 3 of the present application.

[0048] Figure 22 Structure diagram of the optical lens in Embodiment 4 of the present application.

[0049] Figure 23 Curvature of field curve of the optical lens in Embodiment 4 of the present application.

[0050] Figure 24 F-Theta distortion curve of the optical lens in Embodiment 4 of the present application.

[0051] Figure 25 Relative illumination curve of the optical lens in Embodiment 4 of the present application.

[0052] Figure 26 MTF curve of the optical lens in Embodiment 4 of the present application.

[0053] Figure 27 Axial aberration curve of the optical lens in Embodiment 4 of the present application.

[0054] Figure 28 Transverse chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

[0055] Figure 29 Structure diagram of the optical lens in Embodiment 5 of the present application.

[0056] Figure 30 Curvature of field curve of the optical lens in Embodiment 5 of the present application.

[0057] Figure 31 F-Theta distortion curve of the optical lens in Embodiment 5 of the present application.

[0058] Figure 32 Relative illumination curve of the optical lens in Embodiment 5 of the present application.

[0059] Figure 33 MTF curve of the optical lens in Embodiment 5 of the present application.

[0060] Figure 34 Axial aberration curve of the optical lens in the embodiment 5 of the present application.

[0061] Figure 35 Axial aberration curve of the optical lens in the embodiment 5 of the present application.

[0062] Figure 36 Structure diagram of the optical lens in the embodiment 6 of the present application.

[0063] Figure 37 Field curvature curve of the optical lens in the embodiment 6 of the present application.

[0064] Figure 38 F-Theta distortion curve of the optical lens in the embodiment 6 of the present application.

[0065] Figure 39 Relative illumination curve of the optical lens in the embodiment 6 of the present application.

[0066] Figure 40 MTF curve of the optical lens in the embodiment 6 of the present application.

[0067] Figure 41 Axial aberration curve of the optical lens in the embodiment 6 of the present application.

[0068] Figure 42 Axial aberration curve of the optical lens in the embodiment 6 of the present application.

[0069] Figure 43 Structure diagram of the optical lens in the embodiment 7 of the present application.

[0070] Figure 44 Field curvature curve of the optical lens in the embodiment 7 of the present application.

[0071] Figure 45 F-Theta distortion curve of the optical lens in the embodiment 7 of the present application.

[0072] Figure 46 Relative illumination curve of the optical lens in the embodiment 7 of the present application.

[0073] Figure 47 MTF curve of the optical lens in the embodiment 7 of the present application.

[0074] Figure 48 Axial aberration curve of the optical lens in the embodiment 7 of the present application.

[0075] Figure 49 Axial aberration curve of the optical lens in the embodiment 7 of the present application.

[0076] Figure 50 A structure diagram of an optical lens according to an embodiment of the present application.

[0077] Figure 51 A field curvature graph of the optical lens according to the embodiment of the present application.

[0078] Figure 52 An F-Theta distortion graph of the optical lens according to the embodiment of the present application.

[0079] Figure 53 A relative luminance graph of the optical lens according to the embodiment of the present application.

[0080] Figure 54 An MTF graph of the optical lens according to the embodiment of the present application.

[0081] Figure 55 An axial aberration graph of the optical lens according to the embodiment of the present application.

[0082] Figure 56 A transverse chromatic aberration graph of the optical lens according to the embodiment of the present application.

[0083] The following detailed description will further describe the present application with reference to the above-described drawings. DETAILED DESCRIPTION

[0084] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that the detailed description is only a description of embodiments of the present application and 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.

[0085] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation of 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.

[0086] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the shape of the spherical surface or the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0087] In the present disclosure, 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 imaging plane is referred to as the image side surface of the lens.

[0088] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", 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 descriptive terms such as "at least one of' appear in a list of items, the phrase modifies the entire list of items and does not modify the individual items of the list. Furthermore, when describing embodiments of the present application, the word "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0089] 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.

[0090] 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.

[0091] The optical lens of the embodiments of the present application comprises, in order from the object side to the imaging plane along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, a filter, and a protective glass.

[0092] In some embodiments, the first lens can have a negative focal power, which is beneficial for reducing the angle of incidence of the incident light, thereby effectively sharing the large field of view on the object side. The object side surface of the first lens is convex, and the image side surface is concave, which is beneficial for collecting as much edge field of view light as possible into the rear optical lens, thereby realizing large-angle light collection.

[0093] In some embodiments, the second lens can have a negative focal power, and the image side surface thereof is concave, 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 chromatic aberration correction of the optical lens.

[0094] In some embodiments, the third lens may have a negative optical power, which is beneficial to reducing the light deflection angle, enabling the light to transition smoothly, and improving the imaging quality of the optical lens.

[0095] In some embodiments, the fourth lens may have a positive optical power, which is beneficial to improving the light converging ability of the optical lens. Both the object side and the image side of the fourth lens are convex surfaces, which is beneficial to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.

[0096] In some embodiments, the fifth lens may have a negative optical power, which is beneficial to increasing the imaging area of the optical lens and improving the imaging quality of the optical lens. The object side of the fifth lens is a convex surface, and the image side is a concave surface, which can optimize the chromatic aberration of the optical lens and improve the imaging quality of the optical lens.

[0097] In some embodiments, the sixth lens may have a positive optical power, and its object side is a convex surface, which is beneficial to improving the light converging ability of the optical lens, balancing various aberrations generated by the optical lens, and improving the imaging quality of the optical lens.

[0098] In some embodiments, the seventh lens may have a positive optical power, and its object side is a convex surface; it is beneficial to suppressing the angle of the marginal field incident on the imaging surface, effectively transmitting more light beams to the imaging surface, and improving the imaging quality of the optical lens.

[0099] In some embodiments, the radius of curvature R8 of the image side of the fourth lens and the radius of curvature R9 of the object side of the fifth lens satisfy: -7 < R8 / R9 < -1.6. Meeting the above range, by controlling the radii of curvature of the lenses before and after the aperture, the stray light of the optical lens can be effectively controlled, the formation of ghost images can be reduced, and the imaging quality of the optical lens can be improved.

[0100] In some embodiments, the combined focal length f of the first lens to the fourth lens 14 and the combined focal length f of the fifth lens to the seventh lens 57 satisfy: 2.0 < |f 14 / f 57 | < 6.0. Meeting the above range can reduce the light deflection angle before the aperture and reduce the off-axis aberration correction pressure of the rear lens group.

[0101] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f satisfy: 10.0 < TTL / f < 13.0. Meeting the above range ensures that there is enough space to adjust the lens structure and optimize the imaging effect.

[0102] In some embodiments, the effective focal length f of the optical lens, the radian θ of the maximum half field angle, and the real image height IH corresponding to the maximum field angle satisfy: 0.9 < (IH / 2) / (f x θ) < 1.0. Satisfying the above range indicates that the F-Theta distortion of the optical lens is well controlled, and the resolution of the optical lens is improved.

[0103] In some embodiments, the maximum field angle FOV of the optical lens and the aperture value FNO satisfy: 105° < FOV / FNO < 140°. Satisfying the above range is conducive to expanding the field angle 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 implementation of large aperture characteristics is 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.

[0104] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.0 < f1 / f < -2.5. Satisfying the above range can make the first lens have appropriate negative focal power, which is conducive to reducing the inclination angle of the incident light, and is conducive to collecting as much edge field of view light as possible into the rear optical lens, thereby realizing large-angle light collection.

[0105] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4.0 < f2 / f < -2.5. Satisfying the above range can make the second lens have appropriate 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 chromatic aberration correction of the optical lens.

[0106] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f < -30.0. Satisfying the above range is conducive to reducing the light deflection angle, making the light trend transition smoothly, and improving the imaging quality of the optical lens.

[0107] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.0 < f4 / f < 5.0. Satisfying the above range can make the fourth lens have appropriate positive focal power, which is conducive to improving the light convergence ability of the optical lens. It is conducive to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.

[0108] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -6.0 < f5 / f < -3.0. Satisfying the above range can make the fifth lens have appropriate negative focal power, which is conducive to increasing the imaging area of the optical lens, and can optimize the chromatic aberration of the optical lens and improve the imaging quality of the optical lens.

[0109] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.0 < f6 / f < 2.5. Satisfying the above range can make the sixth lens have appropriate positive refractive power, which is conducive to improving the light converging capability of the optical lens, balancing various aberrations generated by the optical lens, 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 f7 of the seventh lens satisfy: 3.0 < f7 / f < 7.0. 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.

[0111] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 0.4 < ∑CT / TTL < 0.7. Satisfying the above range is conducive to the structural design and production process of the optical lens.

[0112] In some embodiments, the effective focal length f of the optical lens and the central thickness CT3 of the third lens along the optical axis satisfy: 0.7 < CT3 / f < 3.7. Satisfying the above range can improve the field curvature of the ultra-wide-angle lens by setting a thicker third lens, reduce the difficulty of lens aberration optimization, and thus improve the lens imaging quality.

[0113] 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: 3.0 < TTL / IH < 4.0. Satisfying the above range can effectively balance the demand for image height and miniaturization of the optical lens.

[0114] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD satisfy: 4.5 < IH / EPD < 7.5. Satisfying the above range can increase the width of the light beam incident on the optical lens, so that the brightness of the optical lens at the image surface is improved to avoid dark corners.

[0115] 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: 2.5 < IH / f < 4.0. Satisfying the above range is conducive to balancing the size of the field of view angle and the size of the F-Theta distortion of the optical lens, and improving the imaging quality of the optical lens.

[0116] In some embodiments, the optical back focal length BFL of the optical lens and the effective focal length f satisfy: 0.6 < BFL / f < 1.6. Satisfying the above range can balance between good imaging quality and easy-to-assemble optical back focal length, ensure the imaging quality of the optical lens, avoid interference between the lens and other elements, and reduce the assembly process difficulty of the camera module.

[0117] In some embodiments, the fifth lens and the sixth lens can be cemented to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; and can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0118] In some embodiments, the seventh lens can adopt a surface type of aspheric lens to improve the resolution quality.

[0119] In order to make the system have better optical performance, aspheric lenses are used in the lens, and each aspheric surface shape of the optical lens satisfies the following equation:

[0120]

[0121] Wherein, z is the distance of the curved surface and 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.

[0122] The application will be further described in the following embodiments. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the 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 methods, and are included in the protection scope of the application.

[0123] Embodiment 1

[0124] Please refer to Figure 1 , which is a structure schematic diagram of the optical lens provided in the embodiment 1 of the application, and the optical lens sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2 along the optical axis from the object side to the imaging surface.

[0125] The first lens L1 has negative refractive power, the object side S1 is convex, and the image side S2 is concave;

[0126] The second lens L2 has negative refractive power, the object side S3 and the image side S4 are both concave;

[0127] The third lens L3 has negative refractive power, the object side S5 is convex, and the image side S6 is concave;

[0128] The fourth lens L4 has positive refractive power, the object side S7 and the image side S8 are both convex;

[0129] The stop ST;

[0130] The fifth lens L5 has negative refractive power, the object side S9 is convex, and the image side S10 is concave;

[0131] The sixth lens L6 has positive refractive power, the object side S10 is convex, and the image side S11 is concave;

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

[0133] The seventh lens L7 has positive refractive power, the object side S12 and the image side S13 are both convex;

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

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

[0136] The imaging surface S18 is flat.

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

[0138] Table 1-1

[0139]

[0140]

[0141] The surface type parameters of the aspherical lens of the optical lens in Embodiment 1 are shown in Table 1-2.

[0142] Table 1-2

[0143] Figure 2 K A B C D E F S12 -2.00E+02 0.00E+00 2.34E-04 -1.82E-03 2.89E-04 -3.73E-05 1.54E-06 S13 1.82E+01 0.00E+00 -1.69E-03 -3.94E-04 5.63E-05 -5.53E-06 2.37E-07

[0144] 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 off-axis chromatic aberration curve of the optical lens are respectively as shown inFigure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 2

[0145] Figure 3 The field curvature curve of Example 1 is shown, which represents the bending 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 -0.03mm~0.04mm, which shows that the optical lens can well correct the field curvature.

[0146] Figure 4 The F-Theta distortion curve of Example 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 -6%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0147] Figure 5 The relative luminance curve of Example 1 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 6 The MTF (Modulation Transfer Function) curve of Example 1 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 frequency and high frequency conditions.

[0149] Figure 7 The axial aberration curve of Example 1 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 -6μm~9μm, which shows that the optical lens can well correct the axial aberration.

[0150] Figure 8 ​The diagram shows the transverse chromatic aberration curves for Example 1, representing the chromatic aberration of each wavelength relative to the center wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value (unit: μm) of each wavelength relative to the center wavelength, and the vertical axis represents the normalized field of view. As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±3 μm, indicating that the optical lens can excellently correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0151] Example 2

[0152] Please see Figure 9 The figure shown is a schematic diagram of the optical lens provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0153] The relevant parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0154] Table 2-1

[0155]

[0156] The surface profile parameters of the aspherical lens in Example 2 are shown in Table 2-2.

[0157] Table 2-2

[0158] Figure 10 K A B C D E F S12 -1.24E+01 0.00E+00 4.51E-04 -1.68E-03 4.69E-04 -8.18E-05 4.83E-06 S13 -3.06E+00 0.00E+00 -2.06E-05 -1.06E-03 2.24E-04 -2.92E-05 1.29E-06

[0159] 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 respectively as follows: Figure 11 , Figure 12 , Figure 13 , Figure 14 , Figure 9 , Figure 10 As shown.

[0160] Figure 11 The field curvature curve of Example 2 is shown, which represents the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within -0.12 mm to 0.09 mm, indicating that the optical lens can effectively correct the field curvature.

[0161] Figure 12The F-Theta distortion curve of the embodiment 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 -9%~0, the image compression in the edge angle region is relatively gentle, and the clarity of the expanded image is effectively improved.

[0162] Figure 13 The relative illumination curve of the embodiment 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, indicating that the optical lens has good relative illumination.

[0163] Figure 14 The MTF (Modulation Transfer Function) curve of the embodiment 2 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 ability in low and high frequency cases.

[0164] Figure 15 The axial aberration curve of the embodiment 2 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 -9μm~15μm, indicating that the optical lens can better correct the axial aberration.

[0165] Figure 16 The sagittal chromatic aberration curve of the embodiment 2 is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging surface relative to the center wavelength (0.55μm), the horizontal axis represents the sagittal 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 sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm~3μm, 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 surface.

[0166] Embodiment 3

[0167] Please refer to Figure 17 , which is a structural schematic diagram of the optical lens provided in the embodiment 3 of the present application, and compared with the embodiment 1, the main difference is that the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0168] The related parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0169] Table 3-1

[0170]

[0171] The surface type parameters of the aspherical lens of the optical lens in Example 3 are shown in Table 3-2.

[0172] Table 3-2

[0173] Figure 18 K A B C D E F S12 -2.00E+02 0.00E+00 3.54E-03 -3.40E-03 6.93E-04 -9.83E-05 4.43E-06 S13 7.90E-02 0.00E+00 -1.28E-03 -6.91E-04 1.15E-04 -1.34E-05 5.80E-07

[0174] 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. 11-14, respectively. Figure 19 、 Figure 20 、 Figure 21 、 Figure 16 、 Figure 17 、 Figure 18

[0175] Figure 19 The field curvature curve of Example 3 is shown, which represents the curvature of the meridional image surface and the 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 -0.03mm~0.06mm, which shows that the optical lens can well correct the field curvature.

[0176] Figure 20 The F-Theta distortion curve of Example 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: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -8%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0177] Figure 21 The relative illumination curve of Example 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: %). 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.

[0178] 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. 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 capability in the case of low frequency and high frequency.

[0179] 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. It can be seen from the figure that the shift amount of the axial aberration is controlled within-15 μm-10 μm, which indicates that the optical lens can better correct the axial aberration.

[0180] Figure 24 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-15 μm-10 μm, which indicates that the optical lens can better correct the axial aberration.

[0181] Embodiment 4

[0182] 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 fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0183] 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;

[0184] The second lens L2 has a negative focal power, and the object side S3 and the image side S4 are both concave surfaces;

[0185] The third lens L3 has a negative focal power, the object side S5 is a convex surface, and the image side S6 is a concave surface;

[0186] The fourth lens L4 has a positive focal power, and the object side S7 and the image side S8 are both convex surfaces;

[0187] The stop ST;

[0188] The fifth lens L5 has negative refractive power, the object side S9 is a convex surface, and the image side S10 is a concave surface;

[0189] The sixth lens L6 has positive refractive power, the object side S10 and the image side S11 are both convex surfaces;

[0190] 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;

[0191] The seventh lens L7 has positive refractive power, the object side S12 and the image side S13 are both convex surfaces;

[0192] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0193] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0194] The imaging surface S18 is a flat surface.

[0195] The related parameters of each lens in the optical lens in Embodiment 4 are shown in Table 4-1.

[0196] Table 4-1

[0197]

[0198]

[0199] The surface type parameters of the aspherical lens of the optical lens in Embodiment 4 are shown in Table 4-2.

[0200] Table 4-2

[0201] Figure 26 K A B C D E F S12 -2.27E+01 0.00E+00 -4.54E-03 -9.27E-04 2.43E-04 -5.56E-05 5.01E-06 S13 -2.78E+00 0.00E+00 -3.91E-04 -1.24E-03 2.63E-04 -2.95E-05 1.38E-06

[0202] 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 27 、 Figure 28 、 Figure 23 、 Figure 24 、 Figure 25 、 Figure 26

[0203] Figure 27 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-0.06mm-0.09mm, which shows that the optical lens can well correct the field curvature. ​

[0204] Figure 28 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 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 -4%~0, the image compression in the edge angle region is relatively gentle, and the clarity of the expanded image is effectively improved.

[0205] Figure 29 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 40% at the maximum half field angle, which indicates that the optical lens has good relative illumination.

[0206] Figure 30 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 0.3 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.

[0207] Figure 31 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 ±15μm, which indicates that the optical lens can better correct the axial aberration.

[0208] Figure 32 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 ±15μm, which indicates that the optical lens can better correct the axial aberration.

[0209] Embodiment 5

[0210] Please refer to Figure 33Figure 5 shows a structural schematic diagram of the optical lens provided in Embodiment 5 of the present application, which differs from Embodiment 1 mainly in that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0211] The related parameters of each lens in the optical lens in Embodiment 5 are shown in Table 5-1.

[0212] Table 5-1

[0213]

[0214] The surface type parameters of the aspherical lens of the optical lens in Embodiment 5 are shown in Table 5-2.

[0215] Table 5-2

[0216] Figure 34 K A B C D E F S12 -6.30E+00 0.00E+00 -2.06E-03 -5.98E-05 -5.19E-05 5.84E-06 -3.82E-07 S13 1.65E+02 0.00E+00 -3.59E-04 -4.45E-04 3.79E-05 -2.62E-06 7.40E-08

[0217] 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 Figures Figure 35 、 Figure 30 、 Figure 31 、 Figure 32 、 Figure 33 、 Figure 34 respectively.

[0218] Figure 35 Figure 5 shows the field curvature curve of Embodiment 5, 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: °). As can be seen from the figure, the field curvature of the meridional image surface and sagittal image surface is controlled within -0.09mm-0.06mm, which indicates that the optical lens can well correct the field curvature.

[0219] Figure 36 Figure 5 shows the F-Theta distortion curve of Embodiment 5, 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 -8%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0220] Figure 37 Figure 5 shows the relative illumination curve of Embodiment 5, 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 indicates that the optical lens has good relative illumination.

[0221] Figure 38 The MTF (Modulation Transfer Function) curve of the optical lens of 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. As can be seen from the figure, the MTF value of the embodiment is above 0.3 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 capability in low and high frequency cases.

[0222] Figure 39 The axial aberration curve of 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. As can be seen from the figure, the offset of the axial aberration is controlled within ±10 μm, which shows that the optical lens can better correct the axial aberration.

[0223] Figure 40 The curve of the optical lens of 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 of view angle. As can be seen from the figure, the vertical color difference of the longest wavelength and the shortest wavelength is controlled within -2 μm-5 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.

[0224] Embodiment 6

[0225] Please refer to Figure 41 , which is a structural schematic diagram of the optical lens provided in embodiment 6 of the present application, compared with embodiment 1, the main difference is that the curvature radius, lens thickness and other optical parameters of each lens surface are different.

[0226] The related parameters of each lens in the optical lens in embodiment 6 are shown in Table 6-1.

[0227] Table 6-1

[0228]

[0229] The surface type parameters of the aspherical lens of the optical lens in embodiment 6 are shown in Table 6-2.

[0230] Table 6-2

[0231] Figure 42 K A B C D E F S12 -2.00E+02 0.00E+00 -1.18E-03 -9.12E-04 6.32E-05 -5.92E-06 -3.96E-07 S13 4.73E-02 0.00E+00 -1.63E-03 -3.57E-04 3.98E-05 -3.49E-06 1.25E-07

[0232] 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 37 、 Figure 38 、 Figure 39 、 Figure 40 、 Figure 41 、 Figure 42 .

[0233] Figure 43 FIG. 6 shows the field curvature curve of Example 6, 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 -0.03 mm-0.06 mm, which shows that the optical lens can well correct the field curvature.

[0234] Figure 44 FIG. 7 shows the F-Theta distortion curve of Example 6, 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 -8%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0235] Figure 45 FIG. 8 shows the relative illumination curve of Example 6, 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.

[0236] Figure 46 FIG. 9 shows the MTF (Modulation Transfer Function) curve of Example 6, which represents the imaging modulation degree of the lens at different spatial frequencies in each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the present 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 of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency conditions.

[0237] Figure 47The axial aberration curve of the 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 shift of the axial aberration is controlled within ±10 μm, which shows that the optical lens can correct the axial aberration well.

[0238] Figure 48 The curve of the axial aberration of the 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 shift of the axial aberration is controlled within ±10 μm, which shows that the optical lens can correct the axial aberration well.

[0239] Embodiment 7

[0240] Please refer to Figure 44 , which is a structural schematic diagram of the optical lens provided in the embodiment 7 of the present application, and 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 fourth lens L4, a diaphragm ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0241] 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;

[0242] 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;

[0243] The third lens L3 has a negative focal power, the object side S5 is a convex surface, and the image side S6 is a concave surface;

[0244] The fourth lens L4 has a positive focal power, and the object side S7 and the image side S8 are both convex surfaces;

[0245] The diaphragm ST;

[0246] The fifth lens L5 has a negative focal power, the object side S9 is a convex surface, and the image side S10 is a concave surface;

[0247] The sixth lens L6 has a positive focal power, and the object side S10 and the image side S11 are both convex surfaces;

[0248] 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;

[0249] The seventh lens L7 has positive refractive power, the object side S12 is a convex surface, and the image side S13 is a concave surface;

[0250] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0251] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0252] The imaging surface S18 is a flat surface.

[0253] The related parameters of each lens in the optical lens in Embodiment 7 are shown in Table 7-1.

[0254] Table 7-1

[0255]

[0256]

[0257] The surface type parameters of the aspherical lens of the optical lens in Embodiment 7 are shown in Table 7-2.

[0258] Table 7-2

[0259] Figure 45 K A B C D E F S12 -1.21E+01 0.00E+00 4.91E-03 -6.61E-04 2.91E-05 -4.24E-07 -7.90E-08 S13 -3.04E+00 0.00E+00 1.36E-03 -2.22E-04 -4.27E-06 1.82E-08 8.02E-09

[0260] 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 46 、 Figure 47 、 Figure 48 、 Figure 49 、 Figure 50 、 Figure 51

[0261] Figure 52 The field curvature curve of Embodiment 7 is shown, which represents the curvature of the meridional image surface and the 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-0.08mm~0.04mm, which shows that the optical lens can well correct the field curvature.

[0262] Figure 53 The F-Theta distortion curve of Embodiment 7 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-9%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved. ​

[0263] Figure 54 The relative luminance curve of the embodiment 7 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: %). It can be seen from the figure that the relative luminance value of the optical lens is still greater than 80% at the maximum half field angle, which indicates that the optical lens has good relative luminance.

[0264] Figure 55 The MTF (modulation transfer function) curve of the embodiment 7 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. It can be seen from the figure that 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 the case of low frequency and high frequency.

[0265] 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 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-10 μm-15 μm, which indicates that the optical lens can better correct the axial aberration.

[0266] Figure 51 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 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-10 μm-15 μm, which indicates that the optical lens can better correct the axial aberration.

[0267] Embodiment 8

[0268] Please refer to Figure 52 , which is a structural schematic diagram of the optical lens provided in the embodiment 8 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 fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0269] 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;

[0270] The second lens L2 has a negative focal power, and the object side S3 and the image side S4 are both concave surfaces;

[0271] The third lens L3 has negative focal power, the object side S5 is concave, and the image side S6 is convex;

[0272] The fourth lens L4 has positive focal power, the object side S7 and the image side S8 are both convex;

[0273] The stop ST;

[0274] The fifth lens L5 has negative focal power, the object side S9 is convex, and the image side S10 is concave;

[0275] The sixth lens L6 has positive focal power, the object side S10 is convex, and the image side S11 is concave;

[0276] 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;

[0277] The seventh lens L7 has positive focal power, the object side S12 and the image side S13 are both convex;

[0278] The object side S14 and the image side S15 of the filter G1 are both flat;

[0279] The object side S16 and the image side S17 of the protective glass G2 are both flat;

[0280] The imaging surface S18 is flat.

[0281] The related parameters of the lenses in the optical lens in Embodiment 8 are shown in Table 8-1.

[0282] Table 8-1

[0283]

[0284]

[0285] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 8 are shown in Table 8-2.

[0286] Table 8-2

[0287] Figure 53 K A B C D E F S12 2.61E+01 0.00E+00 -2.12E-03 -1.82E-04 5.07E-05 -6.57E-06 3.36E-07 S13 -6.28E+00 0.00E+00 -5.69E-05 -2.45E-04 4.67E-05 -3.48E-06 9.95E-08

[0288] 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 54 、 Figure 55 、 Figure 56 、 ​ 、 ​ 、 ​ , respectively.

[0289] ​ The field curvature curve of Example 8 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~0.15mm, which shows that the optical lens can well correct the field curvature.

[0290] ​ The F-Theta distortion curve of Example 8 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 -6%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0291] ​ The relative luminance curve of Example 8 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.

[0292] ​ The MTF (Modulation Transfer Function) curve of Example 8 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 conditions.

[0293] ​ The axial aberration curve of Example 8 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~15μm, which shows that the optical lens can well correct the axial aberration.

[0294] ​The vertical color aberration curve of embodiment 8 is shown, which represents the color 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 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, which shows that the optical lens can well correct the color aberration of the edge field and the secondary spectrum of the entire image plane.

[0295] Referring to Table 9, the optical characteristics 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 the embodiments.

[0296] Table 9

[0297]

[0298]

[0299] 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.

[0300] 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.

[0301] The above-described embodiments only express several embodiments of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens comprising seven lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: The first lens with negative optical power has a convex object side and a concave image side. A second lens with negative optical power has a concave image-side surface; A third lens with negative optical power; The fourth lens with positive optical power has convex surfaces on both its object side and image side. Aperture; The fifth lens with negative optical power has a convex object side and a concave image side. The sixth lens has positive optical power and its object side is convex. The seventh lens, which has positive optical power, has a convex object-side surface; The image-side surface curvature radius R8 of the fourth lens and the object-side surface curvature radius R9 of the fifth lens satisfy: -7 <R8 / R9<-1.6; The effective focal length f of the optical lens, the radian of the maximum half field of view θ, and the true image height IH corresponding to the maximum field of view satisfy: 0.9 < (IH / 2) / (f×θ) < 1.0; The maximum field of view (FOV) and aperture value (FNO) of the optical lens satisfy: 105° <FOV / FNO<140°; The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.0 <f1 / f<-2.5。 2. The optical lens according to claim 1, characterized in that, The combined focal length f of the first to fourth lenses 14 The combined focal length f with the fifth to seventh lenses 57 Satisfy: 2.0 < |f 14 / f 57 | <6.

0.

3. The optical lens according to claim 1, characterized in that, The total optical length (TTL) and effective focal length (f) of the optical lens satisfy: 10.0 <TTL / f<13.0。 4. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 3.0 <f7 / f<7.0。 5. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD satisfy: 4.5 <IH / EPD<7.5。 6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 2.5 <IH / f<4.0。 7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4.0 <f2 / f<-2.5。 8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.0 <f4 / f<5.0。 9. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -6.0 <f5 / f<-3.0。 10. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.0 <f6 / f<2.5。

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