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 is a convex surface and the image side surface is a concave surface; a second lens with negative optical power, wherein the object side surface and the image side surface are both concave surfaces; a third lens with positive optical power, wherein the object side surface and the image side surface are both convex surfaces; a fourth lens with negative optical power, wherein the object side surface is a convex surface and the image side surface is a concave surface; a fifth lens with positive optical power, wherein the object side surface and the image side surface are both convex surfaces; a sixth lens with positive optical power, wherein the object side surface and the image side surface are both convex surfaces; and a seventh lens with negative optical power; and the maximum field of view FOV of the optical lens satisfies FOV>190°. The optical lens has a large field of view, high resolving power, good imaging quality and clear edge field of view imaging through reasonable configuration of the surface shapes of the lenses and reasonable matching of the optical powers.

Description

TECHNICAL FIELD

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

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

[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving, which collects environmental information through various lenses combined with sensors to ensure the safety of drivers. After the imaging surface of the existing ADAS system is collected, a certain degree of cropping is performed, and the field of view of the final picture is about 70% to 80% of the field of view of the lens, so the imaging quality of the edge field of view of the lens is required to be low during the design process. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of large field of view and good edge field of view imaging effect.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is:

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

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

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

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

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

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

[0012] The sixth lens with positive focal power, both the object side surface and the image side surface are convex;

[0013] The seventh lens with negative focal power;

[0014] The maximum field of view FOV of the optical lens satisfies: FOV>190°;

[0015] The real image height IH corresponding to the effective focal length f and the maximum field of view angle of the optical lens and the radian θ of the maximum half field of view angle satisfy: (IH / 2) / (f*theta) >= 1.3.

[0016] Further preferably, the real image height IH corresponding to the maximum field of view angle of the optical lens and the real image height IHtheta corresponding to the central half field of view angle satisfy: IHtheta / IH < 0.48.

[0017] Further preferably, the effective focal length f and the optical back focal length BFL of the optical lens satisfy: BFL / f > 1.5.

[0018] Further preferably, the effective focal length f and the focal length f1 of the first lens satisfy: f1 / f < -5.5.

[0019] Further preferably, the effective focal length f and the focal length f7 of the seventh lens satisfy: f7 / f < -4.5.

[0020] Further preferably, the object side surface radius of curvature R5 of the third lens and the central thickness CT3 of the third lens along the optical axis satisfy: 0.5 < R5 / CT3 < 1.2.

[0021] Further preferably, the object side surface sagittal height Sag3 of the second lens and the object side surface half diameter d3 of the second lens satisfy: -0.1 < Sag3 / d3 < 0.

[0022] Further preferably, the image side surface sagittal height Sag4 of the second lens and the image side surface half diameter d4 of the second lens satisfy: 0.5 < Sag4 / d4 < 0.9.

[0023] Further preferably, the object side surface sagittal height Sag7 of the fourth lens and the object side surface half diameter d7 of the fourth lens satisfy: Sag7 / d7 < 0.1.

[0024] Further preferably, the total 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: ∑CT / TTL > 0.6.

[0025] The optical lens provided by the present application has a large field of view angle and high resolving power by reasonable configuration of each lens surface and reasonable matching of optical power, and has good imaging quality and clear edge field of view imaging. 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 Vignetting curve of the optical lens in Embodiment 3 of the present application.

[0048] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0049] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] It is to be noted that the expressions first, second, third, etc. in the present specification are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0051] 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 or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0052] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0053] It should also be understood that the use of the terms "including", "including having", "having", "containing", and / or "containing having" when used in this specification intends that existence of stated features, elements and / or components but does not exclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0054] 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.

[0055] 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.

[0056] The optical lens according to the embodiments of the present application sequentially comprises, along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a filter.

[0057] In some embodiments, the first lens can have a negative focal power, the object side surface of which is convex, and the image side surface of which is concave. The second lens can have a negative focal power, both the object side surface and the image side surface of which are concave. The third lens can have a positive focal power, both the object side surface and the image side surface of which are convex. The fourth lens can have a negative focal power, the object side surface of which is convex, and the image side surface of which is concave. The fifth lens can have a positive focal power, both the object side surface and the image side surface of which are convex. The sixth lens can have a positive focal power, both the object side surface and the image side surface of which are convex. The seventh lens can have a negative focal power.

[0058] In some embodiments, the maximum field of view FOV of the optical lens satisfies: FOV>190°. The effective focal length f of the optical lens, the real image height IH corresponding to the maximum field of view, and the radian θ of the maximum half field of view satisfy: (IH / 2) / (f x θ)≥1.3. Simultaneously satisfying the above ranges is conducive to realizing the ultra-wide-angle characteristics of the optical lens, and can effectively improve the proportion of the edge field of view of the optical lens in the entire image plane, thereby improving the angular resolution of the edge field of view.

[0059] In some embodiments, the optical total track length TTL of the optical lens and the effective focal length f satisfy: 15.0 < TTL / f < 20.0. Satisfying the above range ensures sufficient space for adjusting the lens structure and optimizing the imaging effect.

[0060] 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: 9.0 < IH / EPD < 9.5. 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.

[0061] 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: 4.0 < IH / f < 5.0. Satisfying the above range helps to balance the size of the field of view angle and the size of the F-Theta distortion of the optical lens, thereby improving the imaging quality of the optical lens.

[0062] In some embodiments, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: BFL / f > 1.5. Satisfying the above range is conducive to the assembly of the module, and prolonging the back focus is conducive to reducing the energy of ghost images caused by the center reflection of the lens and the filter.

[0063] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the real image height IH0 corresponding to the central half field of view angle satisfy: IH0 / IH < 0.48. Satisfying the above range can highlight the proportion of the edge field of view imaging range in the entire imaging range, and compared with lenses of the same field of view angle, the proportion of the edge field of view imaging range in the entire imaging range is larger when matching a chip of the same size, thereby obtaining more detailed information.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: f1 / f < -5.5. Satisfying the above range is conducive to reducing the deflection angle of the light rays in the edge field of view of the optical lens, so that the incident light rays are as flat as possible, thereby reducing the correction pressure of the subsequent lens on the off-axis aberration, thereby achieving the purpose of improving the resolution of the edge field of view angle.

[0065] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -3.0 < f2 / f < -2.0. Satisfying the above requirement can make the second lens have appropriate negative focal power, share the negative focal power of the front end of the optical lens, thereby helping to avoid excessive deflection of light rays caused by excessive concentration of the focal power of the first lens, and reducing the difficulty of chromatic aberration correction of the optical lens.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: f7 / f <-4.5. Satisfying the above range is conducive to reducing the refraction angle of the edge field of view light of the optical lens, reducing the angle of incidence of the chief ray to the imaging surface, and improving the photosensitive performance of the photosensitive element, thereby improving the imaging quality of the optical lens.

[0067] In some embodiments, the effective focal length f of the optical lens and the combined focal length f13 of the first lens, the second lens and the third lens satisfy: -20.0 < f13 / f < -12.0. Satisfying the above range is conducive to light divergence, so that the optical lens can have a larger field of view, while the depth of field of the optical lens can be reduced to make the imaging quality of the edge field of view easier to improve.

[0068] In some embodiments, the object side surface radius of curvature R11 of the sixth lens and the image side surface radius of curvature R12 of the sixth lens satisfy: 1.1 < (R11-R12) / (R11+R12) < 10.0. Satisfying the above range is conducive to controlling the trend of the edge field of view light, so that the optical lens can highlight the proportion of the edge field of view imaging range in the entire imaging range.

[0069] In some embodiments, the object side surface radius of curvature R5 of the third lens and the central thickness CT3 of the third lens along the optical axis satisfy: 0.5 < R5 / CT3 < 1.2. Satisfying the above range is conducive to the smooth trend of light, especially the light of the edge field of view, which can better correct aberration and improve the imaging quality of the optical lens.

[0070] In some embodiments, the object side surface radius of curvature R11 of the sixth lens and the central thickness CT6 of the sixth lens along the optical axis satisfy: 1.5 < R11 / CT6 < 30.0. Satisfying the above range can reduce the deviation of the incidence angle and the exit angle of light of different fields of view, so that the light transits smoothly, thereby reducing the sensitivity.

[0071] In some embodiments, the object side surface half radius sag height Sag3 of the second lens and the object side surface half radius d3 of the second lens satisfy: -0.1 < Sag3 / d3 < 0. Satisfying the above range is conducive to controlling the small object side surface opening angle of the second lens, ensuring that the incident light from the second lens is relatively smooth, thereby reducing the tolerance sensitivity of the optical lens.

[0072] In some embodiments, the image side surface half radius sag height Sag4 of the second lens and the image side surface half radius d4 of the second lens satisfy: 0.5 < Sag4 / d4 < 0.9. Satisfying the above range is conducive to controlling the large image side surface opening angle of the second lens, making the light of each field of view show a divergent trend, and making the central light and the edge light of each field of view distinct, which is conducive to correcting the aberration of the central light and the edge light of each field of view and realizing high resolution.

[0073] In some embodiments, the sagittal height of the half-aperture radius Sag7 of the object side surface of the fourth lens satisfies Sag7 / d7<0.1, where d7 is the half-aperture radius of the object side surface of the fourth lens. The satisfaction of the above range can reduce the opening angle of the object side surface of the fourth lens, help to change the reflection path of the object side surface of the fourth lens and the chip protective glass, change the optical path, and reduce the interference of ghosting.

[0074] In some embodiments, the sum CT of the central thicknesses of the first lens to the seventh lens along the optical axis respectively satisfies ∑CT / TTL>0.6. The satisfaction of the above range is conducive to the compact structure of the optical lens and the realization of miniaturization.

[0075] In some embodiments, the fourth lens and the fifth 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.

[0076] In order to make the system have better optical performance, a plurality of aspheric lenses are used in the lens, and each aspheric surface shape of the optical lens satisfies the following equation:

[0077]

[0078] 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 curved surface coefficients, respectively.

[0079] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, and 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 preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments. Any change, replacement, combination, or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and should be included in the protection scope of the application.

[0080] Embodiment 1

[0081] Please refer to Figure 1 , which is a structural schematic diagram of an 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 stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0082] The first lens L1 has negative refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;

[0083] The second lens L2 has negative refractive power, the object side surface S3 and the image side surface S4 are both concave surfaces;

[0084] The third lens L3 has positive refractive power, the object side surface S5 and the image side surface S6 are both convex surfaces;

[0085] The stop ST;

[0086] The fourth lens L4 has negative refractive power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface;

[0087] The fifth lens L5 has positive refractive power, the object side surface S8 and the image side surface S9 are both convex surfaces;

[0088] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface of the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;

[0089] The sixth lens L6 has positive refractive power, the object side surface S10 and the image side surface S11 are both convex surfaces;

[0090] The seventh lens L7 has negative refractive power, the object side surface S12 is a convex surface, and the image side surface S13 is a concave surface;

[0091] The object side surface S14 and the image side surface S15 of the filter G1 are both flat surfaces;

[0092] The imaging surface S16 is a flat surface.

[0093] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0094] Table 1-1

[0095]

[0096]

[0097] The surface type parameters of the aspherical lens of the optical lens in Embodiment 1 are shown in Table 1-2.

[0098] Table 1-2

[0099] Surface number K A B C D E F S3 4.96E+01 0.00E+00 3.81E-02 -1.74E-02 3.63E-03 -3.75E-04 1.58E-05 S4 -1.45E+00 0.00E+00 8.99E-02 -8.17E-02 3.59E-02 -7.52E-03 5.98E-04 S7 -8.32E+00 0.00E+00 -9.50E-03 -7.42E-02 4.64E-02 1.32E-01 -2.11E-01 S8 -8.50E-01 0.00E+00 -1.03E-01 -6.16E-02 7.71E-02 -4.00E-02 5.96E-05 S9 -6.00E+01 0.00E+00 -2.09E-01 1.39E-01 -9.67E-02 3.56E-02 -5.19E-03 S10 4.15E+01 0.00E+00 -5.40E-02 -1.91E-02 6.00E-03 -1.06E-03 -2.89E-03 S11 -3.52E+00 0.00E+00 4.22E-03 -8.86E-03 -3.95E-03 1.80E-04 -1.15E-04 S12 -1.29E+00 0.00E+00 4.73E-02 -2.15E-02 -4.24E-03 2.29E-03 -6.27E-04 S13 3.48E-01 0.00E+00 7.51E-02 -3.73E-02 -3.27E-04 1.84E-03 -3.28E-04

[0100] 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 respectively as shown in Figure 2 、 Figure 3 ,Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 as shown in FIG. 6.

[0101] Figure 2 FIG. 6 shows the field curvature curve of the optical lens of Example 1, which represents the curvature of light rays of different wavelengths on 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 -0.04mm~0.12mm, which indicates that the optical lens can well correct the field curvature.

[0102] Figure 3 FIG. 7 shows the F-Theta distortion curve of the optical lens of Example 1, 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 0~40%, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0103] Figure 4 FIG. 8 shows the relative illumination curve of the optical lens of Example 1, 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 50% at the maximum half field angle, which indicates that the optical lens has good relative illumination.

[0104] Figure 5 FIG. 9 shows the MTF (Modulation Transfer Function) curve of the optical lens of Example 1, which represents the imaging modulation degree of the lens at different spatial frequencies, the horizontal axis represents the field angle (unit: °), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the edge field of the present embodiment is greater than 0.3 at a spatial frequency of 120lp / mm, which indicates that the optical lens maintains good imaging quality and good detail resolution capability at the edge field.

[0105] Figure 6 FIG. 10 shows the axial aberration curve of the optical lens of Example 1, 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 -25μm~5μm, which indicates that the optical lens can well correct the axial aberration.

[0106] Figure 7The vertical axis represents the value of the vertical chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) (unit: μm), and the longitudinal axis represents the normalized field of view. As can be seen from the figure, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm-2 μm, which indicates that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0107] Embodiment 2

[0108] Referring to Figure 8 , a structural schematic diagram of an optical lens provided in Embodiment 2 of the present application is shown, and the optical lens of the present embodiment is substantially the same as that of Embodiment 1, with the difference mainly being that the optical parameters such as the curvature radius, aspheric coefficient, thickness, etc. of each lens surface are different.

[0109] The related parameters of each lens in the optical lens in Embodiment 2 are shown in Table 2-1.

[0110] Table 2-1

[0111]

[0112]

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

[0114] Table 2-2

[0115] Surface number K A B C D E F S3 5.00E+01 0.00E+00 4.41E-02 -1.79E-02 3.58E-03 -3.68E-04 1.56E-05 S4 -1.21E+00 0.00E+00 8.91E-02 -8.26E-02 3.57E-02 -7.65E-03 6.38E-04 S7 -1.84E+01 0.00E+00 -1.15E-02 -5.04E-02 1.45E-02 1.56E-01 -2.20E-01 S8 -6.50E-01 0.00E+00 -4.65E-02 -9.76E-02 7.03E-02 -2.84E-02 -5.42E-03 S9 -4.90E+01 0.00E+00 -1.70E-01 1.38E-01 -9.06E-02 4.11E-02 -7.56E-03 S10 3.06E+01 0.00E+00 -1.33E-02 3.96E-03 5.48E-03 -1.18E-03 1.73E-05 S11 -6.24E+00 0.00E+00 8.65E-03 -4.90E-03 -3.83E-03 4.69E-04 4.91E-04 S12 3.60E+00 0.00E+00 6.62E-02 -4.62E-02 -6.22E-03 5.44E-03 -1.66E-03 S13 1.40E+00 0.00E+00 9.83E-02 -5.73E-02 1.14E-03 3.00E-03 -5.44E-04

[0116] In the present embodiment, the field curvature curve, F-Theta distortion curve, relative luminance curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown in Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 respectively.

[0117] Figure 9 The field curvature curve of Embodiment 2 is shown, which indicates 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 longitudinal axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.06 mm-0.1 mm, which indicates that the optical lens can well correct the field curvature.

[0118] Figure 10The F-Theta distortion curve of 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 0-40%, and the image compression in the edge angle region is relatively flat, effectively improving the clarity of the expanded image.

[0119] Figure 11 The relative illumination curve of 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.

[0120] Figure 12 The MTF (Modulation Transfer Function) curve of embodiment 2 is shown, which represents the lens imaging modulation at different spatial frequencies for each field angle. The horizontal axis represents the field angle (unit: °), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the edge field of the present embodiment is greater than 0.3 at a spatial frequency of 120 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution capability at the edge field.

[0121] Figure 13 The axial aberration curve of embodiment 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 -30 μm-5 μm, indicating that the optical lens can better correct the axial aberration.

[0122] Figure 14 The axial aberration curve of embodiment 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 -30 μm-5 μm, indicating that the optical lens can better correct the axial aberration.

[0123] Embodiment 3

[0124] Please refer to Figure 15Fig. 3 is a structural schematic diagram of an optical lens provided in Embodiment 3 of the present application, and the optical lens of the present embodiment is substantially the same as that of Embodiment 1, except that the object side S12 of the seventh lens L7 is a concave surface, the image side S13 of the seventh lens L7 is a convex surface, and the optical parameters such as the curvature radius, asphericity coefficient and thickness of each lens surface are different.

[0125] The related parameters of each lens in the optical lens of Embodiment 3 are shown in Table 3-1.

[0126] Table 3-1

[0127]

[0128]

[0129] The surface type parameters of the aspheric lenses of the optical lens of Embodiment 3 are shown in Table 3-2.

[0130] Table 3-2

[0131] Surface number K A B C D E F S3 5.00E+01 0.00E+00 7.63E-03 -1.38E-03 1.21E-04 -5.53E-06 1.08E-07 S4 -2.53E+00 0.00E+00 4.85E-02 -1.09E-02 1.19E-03 -4.01E-05 -1.74E-06 S7 3.92E+00 0.00E+00 -1.61E-02 -4.62E-04 7.48E-03 -1.47E-02 7.56E-03 S8 -3.03E+00 0.00E+00 2.95E-02 2.64E-02 -3.45E-02 1.39E-02 -1.45E-03 S9 1.92E+01 0.00E+00 -6.11E-02 1.91E-02 -6.68E-03 1.49E-03 -1.13E-04 S10 -1.23E+01 0.00E+00 -2.08E-02 -5.14E-03 1.35E-04 -1.68E-04 3.68E-05 S11 -4.53E+00 0.00E+00 -9.75E-03 -1.05E-03 -1.89E-04 2.86E-06 2.06E-07 S12 -5.28E+00 0.00E+00 7.37E-03 -1.15E-04 -3.93E-04 2.94E-05 -4.55E-06 S13 -4.89E+01 0.00E+00 1.83E-02 -2.73E-03 -6.34E-06 1.36E-05 -6.98E-07

[0132] In the present 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. 3-1, 3-2, 3-3, 3-4, 3-5 and 3-6, respectively. Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21

[0133] Figure 16 Fig. 3-1 shows the field curvature curve of Embodiment 3, which represents the curvature degree of light rays of different wavelengths on the meridional image surface and sagittal image surface, and the horizontal axis represents the offset (unit: mm) and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and sagittal image surface is controlled within -0.12 mm-0.05 mm, which indicates that the optical lens can well correct the field curvature.

[0134] Figure 17 Fig. 3-2 shows the F-Theta distortion curve of Embodiment 3, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, and the horizontal axis represents the F-Theta distortion (unit: %) and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within 0-35%, and the image compression in the edge angle region is relatively flat, which effectively improves the definition of the expanded image.

[0135] Figure 18 ​The relative illumination curves for Example 3 are shown, representing the relative illumination values ​​at different field-of-view 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, indicating that the optical lens has good relative illumination.

[0136] Figure 19 The MTF (Modulation Transfer Function) curve of Example 3 is shown, which represents the lens imaging modulation at different spatial frequencies and field of view angles. The horizontal axis represents the field of view angle (unit: °), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the edge field of view in this example is greater than 0.28 at a spatial frequency of 120 lp / mm, indicating that the optical lens maintains good imaging quality and good detail resolution at the edge field of view.

[0137] Figure 20 The axial aberration curve of Example 3 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 axial aberration offset is controlled within -30μm to 5μm, indicating that the optical lens can correct axial aberration well.

[0138] Figure 21 The diagram shows the transverse chromatic aberration curves for Example 3, 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 of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the diagram, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -2 μm to 2 μm, indicating that the optical lens can effectively correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0139] Please refer to Table 4 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value FNO, true image height IH, principal ray incident angle CRA, and maximum field of view FOV of the optical lens, as well as the values ​​corresponding to each conditional expression in each embodiment.

[0140] Table 4

[0141]

[0142]

[0143] In summary, the optical lens provided by the present invention, through the reasonable configuration of the surface shapes of each lens and the reasonable matching of optical power, enables the lens to have a large field of view and high resolution, has good imaging quality, improves the imaging quality at the edge of the field of view, and makes the edge field of view clear.

[0144] 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0145] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for those of ordinary skill 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 in sequence from an object side to an image plane along an optical axis, characterized by: a first lens with negative refractive power, a convex object side surface and a concave image side surface; a second lens with negative refractive power, both object side surface and image side surface being concave; a third lens with positive refractive power, both object side surface and image side surface being convex; a fourth lens with negative refractive power, a convex object side surface and a concave image side surface; a fifth lens with positive refractive power, both object side surface and image side surface being convex; a sixth lens with positive refractive power, both object side surface and image side surface being convex; a seventh lens with negative refractive power; a maximum field of view FOV of the optical lens satisfies: 202°≥FOV>190°; an effective focal length f, a real image height IH corresponding to the maximum field of view and an arc θ of the maximum half field of view of the optical lens satisfy: 1.32 ≥ (IH / 2) / (f x θ) ≥ 1.3; An effective focal length f of the optical lens and a focal length f7 of the seventh lens satisfy: -125.88 ≤ f7 / f < -4.

5.

2. The optical lens of claim 1, wherein, A real image height IH corresponding to a maximum field angle of the optical lens and a real image height IHθ corresponding to a central half field angle satisfy: 0.44 ≤ IHθ / IH < 0.

48.

3. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and an optical back focal length BFL satisfy: 2.25 ≥ BFL / f > 1.

5.

4. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: -6.17 ≤ f1 / f < -5.

5.

5. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a combined focal length f13 of the first lens, the second lens and the third lens satisfy: -20.0 < f13 / f < -12.

0.

6. The optical lens of claim 1, wherein, A radius of curvature R5 of an object side surface of the third lens and a central thickness CT3 of the third lens along the optical axis satisfy: 0.5 < R5 / CT3 < 1.

2.

7. The optical lens of claim 1, wherein, A half-field radius sag3 of the object side surface of the second lens and a half-field radius d3 of the object side surface of the second lens satisfy: -0.1 < sag3 / d3 < 0.

8. The optical lens of claim 1, wherein, A half-field radius sag4 of the image side surface of the second lens and a half-field radius d4 of the image side surface of the second lens satisfy: 0.5 < sag4 / d4 < 0.

9.

9. The optical lens of claim 1, wherein, A half-field radius sag7 of the object side surface of the fourth lens and a half-field radius d7 of the object side surface of the fourth lens satisfy: 0.05 ≤ sag7 / d7 < 0.

1.

10. The optical lens of claim 1, wherein, An optical total length TTL of the optical lens and a sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 0.66 ≥ ∑CT / TTL > 0.

6. ​

Images