Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative optical power, wherein the object side surface and the image side surface of the second lens are both concave surfaces; 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 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 and the image side surface of the seventh lens are both convex surfaces; the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: |(R3-R4) / (R3+R4)|>3.0. 4) 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 by reasonably configuring the surface type of each lens and reasonably matching the optical power.

Description

TECHNICAL FIELD

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

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

[0003] The panoramic surround view system sets up multiple surround view cameras around the vehicle, which can cover all the field of view ranges around the vehicle. The view angles of the multiple cameras are fused into a 360-degree overhead view of the vehicle body, and finally displayed on the screen of the center console, so that the driver can clearly check whether there are obstacles around the vehicle and understand the relative position and distance of the obstacles, helping the driver to easily park the vehicle. Not only is it very intuitive, but also there is no blind spot, which can improve the driver's comfortable control of the vehicle parking or passing through complex roads, effectively reducing the occurrence of accidents such as scratching, collision, and sinking.

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

[0005] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of excellent imaging quality.

[0006] The present application provides an optical lens, which has seven lenses, and includes, in order along the optical axis from the object side to the imaging surface:

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

[0008] The second lens has negative focal power, and both the object side surface and the image side surface are concave;

[0009] The third lens has negative focal power;

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

[0011] The fifth lens has negative focal power, the object side surface is convex, and the image side surface is concave;

[0012] The sixth lens has positive focal power, and the object side surface is convex;

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

[0014] The object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: |(R3-R4) / (R3+R4)|<0.5.4) |>3.0.

[0015] Further preferably, the optical total track length TTL of the optical lens and the effective focal length f satisfy: 10.0 < TTL / f < 13.0.

[0016] 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.

[0017] Further preferably, the maximum field angle FOV of the optical lens and the aperture value FNO satisfy: 110° < FOV / FNO < 140°.

[0018] Further preferably, the optical total track length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis respectively satisfy: 0.4 < ∑CT / TTL < 0.7.

[0019] 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.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -3.5 < f2 / f < -2.5.

[0021] 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.

[0022] 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.

[0023] 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 < 2.0.

[0024] The optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of optical power. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0027] Figure 2The field curvature curve of the optical lens in the embodiment 1 of the present application.

[0028] Figure 3 The F-Theta distortion curve of the optical lens in the embodiment 1 of the present application.

[0029] Figure 4 The relative illumination curve of the optical lens in the embodiment 1 of the present application.

[0030] Figure 5 The MTF curve of the optical lens in the embodiment 1 of the present application.

[0031] Figure 6 The axial aberration curve of the optical lens in the embodiment 1 of the present application.

[0032] Figure 7 The transverse chromatic aberration curve of the optical lens in the embodiment 1 of the present application.

[0033] Figure 8 The structure diagram of the optical lens in the embodiment 2 of the present application.

[0034] Figure 9 The field curvature curve of the optical lens in the embodiment 2 of the present application.

[0035] Figure 10 The F-Theta distortion curve of the optical lens in the embodiment 2 of the present application.

[0036] Figure 11 The relative illumination curve of the optical lens in the embodiment 2 of the present application.

[0037] Figure 12 The MTF curve of the optical lens in the embodiment 2 of the present application.

[0038] Figure 13 The axial aberration curve of the optical lens in the embodiment 2 of the present application.

[0039] Figure 14 The transverse chromatic aberration curve of the optical lens in the embodiment 2 of the present application.

[0040] Figure 15 The structure diagram of the optical lens in the embodiment 3 of the present application.

[0041] Figure 16 The field curvature curve of the optical lens in the embodiment 3 of the present application.

[0042] Figure 17 The F-Theta distortion curve of the optical lens in the embodiment 3 of the present application.

[0043] Figure 18 The relative illumination curve of the optical lens in the embodiment 3 of the present application.

[0044] Figure 19 MTF curve of the optical lens in embodiment 3 of the present application.

[0045] Figure 20 Axial aberration curve of the optical lens in embodiment 3 of the present application.

[0046] Figure 21 Vignetting curve of the optical lens in embodiment 3 of the present application.

[0047] Figure 22 Structure diagram of the optical lens in embodiment 4 of the present application.

[0048] Figure 23 Curvature of field curve of the optical lens in embodiment 4 of the present application.

[0049] Figure 24 F-Theta distortion curve of the optical lens in embodiment 4 of the present application.

[0050] Figure 25 Relative illumination curve of the optical lens in embodiment 4 of the present application.

[0051] Figure 26 MTF curve of the optical lens in embodiment 4 of the present application.

[0052] Figure 27 Axial aberration curve of the optical lens in embodiment 4 of the present application.

[0053] Figure 28 Vignetting curve of the optical lens in embodiment 4 of the present application.

[0054] Figure 29 Structure diagram of the optical lens in embodiment 5 of the present application.

[0055] Figure 30 Curvature of field curve of the optical lens in embodiment 5 of the present application.

[0056] Figure 31 F-Theta distortion curve of the optical lens in embodiment 5 of the present application.

[0057] Figure 32 Relative illumination curve of the optical lens in embodiment 5 of the present application.

[0058] Figure 33 MTF curve of the optical lens in embodiment 5 of the present application.

[0059] Figure 34 Axial aberration curve of the optical lens in embodiment 5 of the present application.

[0060] Figure 35 Figure 6 is a graph of the lateral chromatic aberration curve of the optical lens of Example 5 of the present application.

[0061] The following detailed description will further describe the present application with reference to the above figures. DETAILED DESCRIPTION

[0062] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It is to be noted that the detailed description is only descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. 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.

[0063] It is to be noted that the expressions first, second, third, etc. are used in this specification only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0064] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0065] 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.

[0066] It is also to be understood that the use of the terms "include", "includes", "including", "comprise", "comprises", "comprising", "have", "has", "having", or "contains" or "containing", when used in this specification, indicates the presence of the 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 describing the embodiments of the present application, the use of "may" indicates that one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

[0067] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0068] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0069] The optical lens of the embodiment of the present application comprises, in order along the optical axis from the object side to the imaging surface: 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.

[0070] In some embodiments, the first lens can have a negative focal power, which is conducive to reducing the inclination angle of the incident light, thereby effectively sharing the large field of view on the object side. The object side of the first lens is convex, and the image side is concave, which is conducive to collecting as much edge field of view light as possible into the rear optical lens, thereby realizing large-angle light collection.

[0071] In some embodiments, the second lens can have a negative focal power, and both the object side and the image side thereof are concave; it can share the negative focal power of the front end of the lens, thereby reducing the excessive folding of light caused by the focal power of the first lens, and reducing the difficulty of chromatic aberration correction of the optical lens.

[0072] In some embodiments, the third lens can have a negative focal power, which is conducive to reducing the light folding angle, allowing the light to transition smoothly, and improving the imaging quality of the optical lens.

[0073] In some embodiments, the fourth lens can have a positive focal power, which is conducive to improving the light converging ability of the optical lens. Both the object side and the image side of the fourth lens are convex, which is conducive to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.

[0074] In some embodiments, the fifth lens can have a negative focal power, which is conducive 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 convex, and the image side is concave, which can optimize the chromatic aberration of the optical lens and improve the imaging quality of the optical lens.

[0075] In some embodiments, the sixth lens can have a positive focal power, and the object side thereof is convex, which is conducive to improving the light converging ability of the optical lens and balancing various aberrations generated by the optical lens, thereby improving the imaging quality of the optical lens.

[0076] In some embodiments, the seventh lens can have positive refractive power, and both the object side surface and the image side surface thereof are convex, which is beneficial to suppress the angle of the edge field of view incident on the imaging surface, effectively transfer more light beams to the imaging surface, and improve the imaging quality of the optical lens.

[0077] In some embodiments, the object side surface radius of curvature R3 of the second lens and the image side surface radius of curvature R4 of the second lens satisfy: |(R3-R4) / (R3+R4)|<0.3. Satisfying the above range helps to ensure that the second lens has sufficient refractive power to match the first lens with stronger negative refractive power, thereby correcting the aberration of the wide-angle lens. 4) |>3.0. Satisfying the above range helps to ensure that the second lens has sufficient refractive power to match the first lens with stronger negative refractive power, thereby correcting the aberration of the wide-angle lens.

[0078] In some embodiments, the total track length TTL of the optical lens and the effective focal length f satisfy: 10.0<TTL / f<13.0. Satisfying the above range ensures sufficient space for adjusting the lens structure and optimizing the imaging effect.

[0079] In some embodiments, the effective focal length f of the optical lens, the radian of the maximum half field of view θ, and the real image height IH corresponding to the maximum field of view 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 better controlled, and the resolving power of the optical lens is improved.

[0080] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 110°<FOV / FNO<140°. Satisfying the above range is beneficial to expand the field of view of the optical lens and increase the aperture of the optical lens, which is beneficial to the optical lens to obtain more scene information, meet the needs of wide-range detection, and the implementation of the large-aperture feature is beneficial to improve the problem that the relative brightness of the edge field of view decreases rapidly, thereby also being beneficial to obtain more scene information.

[0081] In some embodiments, the total track 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 beneficial to the structural design and production process of the optical lens.

[0082] 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 refractive power, which is beneficial to reduce the inclination angle of the incident light, and is beneficial to collect as much edge field of view light as possible into the rear optical lens, and realize large-angle light collection.

[0083] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -3.5 < f2 / f < -2.5. Satisfying the above range, the second lens can have appropriate negative refractive power, can share the negative refractive power of the front end of the lens, thereby reducing the excessive deflection of light caused by the excessive concentration of the refractive power of the first lens, and reducing the difficulty of chromatic aberration correction of the optical lens.

[0084] 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, the fourth lens can have appropriate positive refractive power, which is beneficial to improve the light converging ability of the optical lens, and is beneficial to balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.

[0085] 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, the fifth lens can have appropriate negative refractive power, which is beneficial to increase the imaging area of the optical lens, can optimize the chromatic aberration of the optical lens, and improve the imaging quality of the optical lens.

[0086] 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 < 2.0. Satisfying the above range, the sixth lens can have appropriate positive refractive power, which is beneficial to improve the light converging ability of the optical lens, and is beneficial to balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.

[0087] 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 < 6.0. Satisfying the above range, the seventh lens can have appropriate positive refractive power, which is beneficial to suppress the angle of the edge field of view incident on the imaging surface, effectively transfer more light beams to the imaging surface, and improve the imaging quality of the optical lens.

[0088] In some embodiments, the focal length f1 of the first lens of the optical lens and the focal length f2 of the second lens satisfy: 1.0 < f1 / f2 < 1.3. Satisfying the above range, the second lens can have a smaller focal length, as far as possible to reduce the pressure of the first lens on the deflection of light, and improve the imaging quality of the optical lens.

[0089] 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 < 3.5. Satisfying the above range, by setting a thicker third lens, the field curvature of the ultra-wide-angle lens can be improved, the difficulty of lens aberration optimization is reduced, and the imaging quality of the lens is improved.

[0090] In some embodiments, the optical total length TTL of the optical lens and the real image height IH corresponding to the maximum field of view 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.

[0091] 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 < 7.0. Satisfying the above range can increase the width of the light beam entering the optical lens, so that the brightness of the optical lens at the image plane is improved to avoid dark corners.

[0092] 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 can help balance the size of the field of view angle and the size of the F-Theta distortion of the optical lens, and improve the imaging quality of the optical lens.

[0093] 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 help balance the good imaging quality and the easy-to-assemble optical back focal length 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.

[0094] In some embodiments, the fifth lens and the sixth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens. In addition, the glued lens 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.

[0095] In some embodiments, the seventh lens can adopt a surface type of aspheric lens to improve the resolution quality.

[0096] In order to make the system have better optical performance, aspheric lenses are used in the lens. The shape of each aspheric surface of the optical lens satisfies the following equation:

[0097]

[0098] 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, F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0099] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0100] Embodiment 1

[0101] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in the embodiment 1 of the application, the optical lens includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a third lens L3, a 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.

[0102] The first lens L1 has negative optical power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;

[0103] The second lens L2 has negative optical power, the object side surface S3 and the image side surface S4 are both concave surfaces;

[0104] The third lens L3 has negative optical power, the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface;

[0105] The fourth lens L4 has positive optical power, the object side surface S7 and the image side surface S8 are both convex surfaces;

[0106] The diaphragm ST;

[0107] The fifth lens L5 has negative optical power, the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;

[0108] The sixth lens L6 has positive optical power, the object side surface S10 is a convex surface, and the image side surface S11 is a concave surface;

[0109] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface of the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0110] The seventh lens L7 has positive optical power, the object side surface S12 and the image side surface S13 are both convex surfaces;

[0111] The object side surface S14 and the image side surface S15 of the filter G1 are both flat surfaces;

[0112] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0113] The imaging surface S18 is a plane.

[0114] The related parameters of each lens in the optical lens in Embodiment 1 are shown in Table 1-1.

[0115] Table 1-1

[0116]

[0117]

[0118] The surface type parameters of the aspherical lens of the optical lens in Embodiment 1 are shown in Table 1-2.

[0119] Table 1-2

[0120] Surface number 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

[0121] 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. 1-1 to 1-6, respectively. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7

[0122] Figure 2 The field curvature curve of Embodiment 1 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~0.04mm, which shows that the optical lens can well correct the field curvature.

[0123] Figure 3 The F-Theta distortion curve of Embodiment 1 is shown, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -6%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0124] Figure 4 The relative illumination curve of Embodiment 1 is shown, which represents the relative illumination value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 60% at the maximum half field angle, which shows that the optical lens has good relative illumination.

[0125] ​Figure 5 The MTF (Modulation Transfer Function) curve of the optical lens of Example 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 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 field of view, and has good imaging quality and good detail resolution capability in both low and high frequency cases.

[0126] Figure 6 The axial aberration curve of the optical lens of Example 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 of the axial aberration is controlled within-6 μm-9 μm, which shows that the optical lens can better correct the axial aberration.

[0127] Figure 7 The curve of the optical lens of Example 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 of the axial aberration is controlled within-6 μm-9 μm, which shows that the optical lens can better correct the axial aberration.

[0128] Example 2

[0129] Please refer to Figure 8 , which is a structural schematic diagram of the optical lens provided in Example 2 of the present application. Compared with Example 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0130] The related parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0131] Table 2-1

[0132]

[0133] The surface type parameters of the aspherical lens of the optical lens in Example 2 are shown in Table 2-2.

[0134] Table 2-2

[0135] Surface number 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

[0136] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve and axial aberration curve of the optical lens are shown inFigure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14

[0137] 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 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~0.06mm, which shows that the optical lens can well correct the field curvature.

[0138] Figure 10 The F-Theta distortion curve of Example 2 is shown, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -8%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0139] 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 50% at the maximum half field angle, which shows that the optical lens has good relative luminance.

[0140] 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 frequency and high frequency conditions.

[0141] 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 -15μm~10μm, which shows that the optical lens can well correct the axial aberration.

[0142] Figure 14 ​The vertical color aberration curve of the embodiment 2 is shown, which represents the color aberration of each wavelength at different image heights on the imaging surface relative to the central wavelength (0.55 μm), the horizontal axis represents the vertical color aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical color aberration of the longest wavelength and the shortest wavelength is controlled within -1 μm-4 μm, which indicates that the optical lens can well correct the color aberration of the edge field and the secondary spectrum of the entire image surface.

[0143] Embodiment 3

[0144] Referring to Figure 15 , which is a structural schematic diagram of the optical lens provided in the embodiment 3 of the present application, the optical lens sequentially 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.

[0145] 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;

[0146] The second lens L2 has a negative focal power, and the object side S3 and the image side S4 are both concave surfaces;

[0147] 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;

[0148] The fourth lens L4 has a positive focal power, and the object side S7 and the image side S8 are both convex surfaces;

[0149] The stop ST;

[0150] 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;

[0151] The sixth lens L6 has a positive focal power, and the object side S10 and the image side S11 are both convex surfaces;

[0152] 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;

[0153] The seventh lens L7 has a positive focal power, and the object side S12 and the image side S13 are both convex surfaces;

[0154] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0155] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0156] The imaging surface S18 is a flat surface.

[0157] The related parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0158] Table 3-1

[0159]

[0160]

[0161] The surface type parameters of the aspherical lens of the optical lens in Example 3 are shown in Table 3-2.

[0162] Table 3-2

[0163] Surface number 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

[0164] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens are shown in FIGS. Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21

[0165] Figure 16 The field curvature curve of Example 3 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 -0.06mm~0.09mm, which shows that the optical lens can well correct the field curvature.

[0166] Figure 17 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 -4%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0167] Figure 18 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 40% at the maximum half field angle, which shows that the optical lens has good relative illumination.

[0168] Figure 19 ​The MTF (Modulation Transfer Function) curve of the optical lens of embodiment 3 is shown, which represents the imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. 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 the case of low frequency and high frequency.

[0169] Figure 20 The axial aberration curve of embodiment 3 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 ±15 μm, which shows that the optical lens can better correct the axial aberration.

[0170] Figure 21 The curve of the axial aberration of embodiment 3 is shown, which represents the color difference of different image heights on the imaging surface at each wavelength relative to the center wavelength (0.55 μm), the horizontal axis represents the axial aberration value (unit: μm) of each wavelength relative to the center wavelength, and the vertical axis represents the normalized field of view angle. As can be seen from the figure, the axial aberration of the longest wavelength and the shortest wavelength is controlled within -6 μm-8 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.

[0171] Embodiment 4

[0172] Please refer to Figure 22 , which is a structural schematic diagram of the optical lens provided in embodiment 4 of the present application. Compared with embodiment 1, the main difference of the embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0173] The related parameters of each lens in the optical lens in embodiment 4 are shown in Table 4-1.

[0174] Table 4-1

[0175]

[0176]

[0177] The surface type parameters of the aspherical lens of the optical lens in embodiment 4 are shown in Table 4-2.

[0178] Table 4-2

[0179] Surface number 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

[0180] 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. 1-5, respectively. Figure 23 , Figure 24 , Figure 25 , Figure 26 , Figure 27 , Figure 28 .

[0181] Figure 23 FIG. 6 shows the field curvature curve of Example 4, which represents the curvature of light rays of different wavelengths at the sagittal image plane and the tangential image plane, 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 sagittal image plane and the tangential image plane is controlled within -0.09 mm-0.06 mm, which indicates that the optical lens can well correct the field curvature.

[0182] Figure 24 FIG. 7 shows the F-Theta distortion curve of Example 4, 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 -8%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0183] Figure 25 FIG. 8 shows the relative illumination curve of Example 4, which represents the relative illumination value at 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 50% at the maximum half field angle, which indicates that the optical lens has good relative illumination.

[0184] Figure 26 FIG. 9 shows the MTF (Modulation Transfer Function) curve of Example 4, 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 0-160 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 both low frequency and high frequency cases.

[0185] Figure 27The 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 shift of the axial aberration is controlled within ±10 μm, which shows that the optical lens can well correct the axial aberration.

[0186] Figure 28 The curve of the axial aberration of embodiment 4 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 axial 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 axial aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm-5 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.

[0187] Embodiment 5

[0188] Please refer to Figure 29 , which is a structural schematic diagram of the optical lens provided in embodiment 5 of the present application, which comprises, along the optical axis from the object side to the imaging plane, a first lens L1, a second lens L2, a third lens L3, a 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.

[0189] 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;

[0190] The second lens L2 has a negative focal power, and the object side S3 and the image side S4 are both concave surfaces;

[0191] The third lens L3 has a negative focal power, the object side S5 is a concave surface, and the image side S6 is a convex surface;

[0192] The fourth lens L4 has a positive focal power, and the object side S7 and the image side S8 are both convex surfaces;

[0193] The stop ST;

[0194] 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;

[0195] The sixth lens L6 has a positive focal power, the object side S10 is a convex surface, and the image side S11 is a concave surface;

[0196] 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;

[0197] The seventh lens L7 has positive refractive power, and both the object side S12 and the image side S13 are convex surfaces;

[0198] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0199] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0200] The imaging surface S18 is a flat surface.

[0201] The related parameters of each lens in the optical lens in Embodiment 5 are shown in Table 5-1.

[0202] Table 5-1

[0203]

[0204]

[0205] The surface type parameters of the aspherical lens of the optical lens in Embodiment 5 are shown in Table 5-2.

[0206] Table 5-2

[0207] Surface number 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

[0208] In this embodiment, the field curvature curve, the F-Theta distortion curve, the relative illumination curve, the MTF curve, the axial aberration curve, and the transverse chromatic aberration curve of the optical lens are shown in FIGS. Figure 30 、 Figure 31 、 Figure 32 、 Figure 33 、 Figure 34 、 Figure 35

[0209] Figure 30 The field curvature curve of Embodiment 5 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-0.05mm~0.15mm, which shows that the optical lens can well correct the field curvature.

[0210] Figure 31 The F-Theta distortion curve of Embodiment 5 is shown, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within-6%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved. ​

[0211] Figure 32 The relative illumination curve of embodiment 5 is shown, which represents the relative illumination values of different field angles on the imaging plane, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative 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, indicating that the optical lens has good relative illumination.

[0212] Figure 33 The MTF (Modulation Transfer Function) curve of embodiment 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 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.

[0213] Figure 34 The axial aberration curve of embodiment 5 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the shift of the axial aberration is controlled within-20 μm-15 μm, indicating that the optical lens can better correct the axial aberration.

[0214] Figure 35 The axial aberration curve of embodiment 5 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the shift of the axial aberration is controlled within-20 μm-15 μm, indicating that the optical lens can better correct the axial aberration.

[0215] Please refer to Table 6, the optical properties corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value FNO, the real image height IH, and the maximum field of view FOV of the optical lens, and the numerical values corresponding to each conditional expression in each embodiment.

[0216] Table 6

[0217]

[0218]

[0219] In summary, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by reasonable configuration of each lens surface and reasonable matching of optical power.

[0220] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0221] The above-described embodiments only express several implementation manners of the present application, and the description is relatively 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 those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, whose object side surface is a convex surface and whose image side surface is a concave surface; a second lens with negative refractive power, whose object side surface and image side surface are both concave surfaces; a third lens with negative refractive power; a fourth lens with positive refractive power, whose object side surface and image side surface are both convex surfaces; a fifth lens with negative refractive power, whose object side surface is a convex surface and whose image side surface is a concave surface; a sixth lens with positive refractive power, whose object side surface is a convex surface; a seventh lens with positive refractive power, whose object side surface and image side surface are both convex surfaces; The object side curvature radius R3 of the second lens and the image side curvature radius R4 of the second lens satisfy: 7.79 ≥ |(R3-R4) / (R3+R 4) |>3.0; The maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 110°<FOV / FNO<140°.

2. The optical lens of claim 1, wherein, The total optical length TTL of the optical lens and the effective focal length f satisfy: 10.0<TTL / f<13.

0.

3. The optical lens of claim 1, wherein, The effective focal length f of the optical lens, the radian θ of the maximum half field of view, and the real image height IH corresponding to the maximum field of view satisfy: 0.9<(IH / 2) / (f×θ)<1.

0.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 3.0<f7 / f<6.

0.

5. The optical lens of claim 1, wherein, 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.

6. The optical lens of claim 1, wherein, 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.

7. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -3.5<f2 / f<-2.

5.

8. The optical lens of claim 1, wherein, 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 of claim 1, wherein, 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 of claim 1, wherein, The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.0<f6 / f<2.0.

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