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 positive refractive power; a second lens with positive refractive power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens with positive refractive power, the object side surface and the image side surface of the third lens are both convex surfaces; a fourth lens with refractive power; a fifth lens with refractive power, the image side surface of the fifth lens is a concave surface; a sixth lens with positive refractive power, the object side surface of the sixth lens is a convex surface; and a seventh lens with refractive power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface; and the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: |(R1+R2) / (R1‑R2)|>10. The optical lens provided by the application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens through reasonable configuration of each lens surface type and reasonable matching of refractive power.

Description

TECHNICAL FIELD

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

[0002] With the increasing demand for driving experience, vehicle application type optical lenses are increasingly used in intelligent driving, and vehicle optical lenses are playing an increasingly important role in the automotive industry.

[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving, which collects environmental information through various lenses combined with sensors to ensure the safety of drivers. The lenses of the existing ADAS system need a longer focal length in long-distance imaging, but a longer focal length will result in a longer total length of the lens, which is not conducive to the miniaturization of the lens. At the same time, such lenses need a larger aperture to have good imaging quality in the dark or weak light environment. Therefore, it is necessary to develop an optical lens with long focal length, small size, low cost, high resolution, and can be used in weak light and harsh environment. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of long focal length, small size, low cost, high resolution, and can be used in weak light and harsh environment.

[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] A first lens with positive refractive power;

[0008] A second lens with positive refractive power, the object side is concave, and the image side is convex;

[0009] A third lens with positive refractive power, both the object side and the image side are convex;

[0010] A fourth lens with refractive power;

[0011] A fifth lens with refractive power, the image side is concave;

[0012] A sixth lens with positive refractive power, the object side is convex;

[0013] A seventh lens with refractive power, the object side is convex, and the image side is concave;

[0014] The object-side surface curvature radius R1 of the first lens and the image-side surface curvature radius R2 of the first lens satisfy: |(R1+R2) / (R1-R2)|>10.0.

[0015] Further preferably, the object-side surface curvature radius R3 of the second lens and the image-side surface curvature radius R4 of the second lens satisfy: (R3+R4) / (R3-R4)>5.0.

[0016] Further preferably, the total track length TTL of the optical lens and the effective focal length f satisfy: 1.5<TTL / f<2.5.

[0017] Further preferably, the effective focal length f of the optical lens, the maximum field of view FOV and the real image height ih corresponding to the maximum half field of view angle satisfy: 0.9<ih / (f*tan(FOV / 2))<1.1.

[0018] Further preferably, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 12.0°<FOV / FNO<25.0°.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: f1 / f>3.0.

[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<8.0.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.5<f3 / f<2.0.

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -0.5<f4 / f<1.1.

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.6<f5 / f<1.6.

[0024] The optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, improves the imaging quality of the optical lens, and realizes the effects of long focal length, small size, low cost, high resolution, and use in weak light and harsh environments. 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 Structure diagram of the optical lens in Embodiment 1 of the present application.

[0027] Figure 2 Field curvature curve of the optical lens in Embodiment 1 of the present application.

[0028] Figure 3 F-Tanθ distortion curve of the optical lens in Embodiment 1 of the present application.

[0029] Figure 4 Relative luminance curve of the optical lens in Embodiment 1 of the present application.

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

[0031] Figure 6 Axial aberration curve of the optical lens in Embodiment 1 of the present application.

[0032] Figure 7 Vignetting curve of the optical lens in Embodiment 1 of the present application.

[0033] Figure 8 Structure diagram of the optical lens in Embodiment 2 of the present application.

[0034] Figure 9 Field curvature curve of the optical lens in Embodiment 2 of the present application.

[0035] Figure 10 F-Tanθ distortion curve of the optical lens in Embodiment 2 of the present application.

[0036] Figure 11 Relative luminance curve of the optical lens in Embodiment 2 of the present application.

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

[0038] Figure 13 Axial aberration curve of the optical lens in Embodiment 2 of the present application.

[0039] Figure 14 Vignetting curve of the optical lens in Embodiment 2 of the present application.

[0040] Figure 15 Structure diagram of the optical lens in Embodiment 3 of the present application.

[0041] Figure 16 Field curvature curve of the optical lens in Embodiment 3 of the present application.

[0042] Figure 17F-Tanθ distortion curve of the optical lens in Embodiment 3 of the present application.

[0043] Figure 18 Relative illumination curve of the optical lens in 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-Tanθ 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-Tanθ 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 chromatic aberration curve of the optical lens in the embodiment 5 of the present application.

[0060] Figure 35 Axial chromatic aberration curve of the optical lens in the embodiment 5 of the present application.

[0061] Figure 36 Structure diagram of the optical lens in the embodiment 6 of the present application.

[0062] Figure 37 Curvature of field curve of the optical lens in the embodiment 6 of the present application.

[0063] Figure 38 F-Tanθ distortion curve of the optical lens in the embodiment 6 of the present application.

[0064] Figure 39 Relative luminance curve of the optical lens in the embodiment 6 of the present application.

[0065] Figure 40 MTF curve of the optical lens in the embodiment 6 of the present application.

[0066] Figure 41 Axial chromatic aberration curve of the optical lens in the embodiment 6 of the present application.

[0067] Figure 42 Axial chromatic aberration curve of the optical lens in the embodiment 6 of the present application.

[0068] Figure 43 Structure diagram of the optical lens in the embodiment 7 of the present application.

[0069] Figure 44 Curvature of field curve of the optical lens in the embodiment 7 of the present application.

[0070] Figure 45 F-Tanθ distortion curve of the optical lens in the embodiment 7 of the present application.

[0071] Figure 46 Relative luminance curve of the optical lens in the embodiment 7 of the present application.

[0072] Figure 47 MTF curve of the optical lens in the embodiment 7 of the present application.

[0073] Figure 48 Axial chromatic aberration curve of the optical lens in the embodiment 7 of the present application.

[0074] Figure 49 Axial chromatic aberration curve of the optical lens in the embodiment 7 of the present application.

[0075] The following detailed description will further explain the present application with reference to the accompanying drawings. DETAILED DESCRIPTION

[0076] For a better understanding of the present application, various aspects of the present application will be described in relation to the annexed drawings. It is stressed that these descriptions are only illustrative of embodiments of the present application and are not meant to limit the scope of the present application in any way. Throughout the present description, like reference numerals are used to refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0077] It is noted that, in this specification, the terms first, second, third, etc. are used merely to distinguish one feature from another, without implying any limitation on the features. Thus, the first lens discussed below can also be referred to as a second lens or a third lens, without departing from the teachings of the present application.

[0078] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for ease 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.

[0079] 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.

[0080] It is also to be understood that the use of the terms "including", "comprising", "having" and / or "containing" when used in this specification, particularly in the claims, means that there are no restrictions on the presence of one or more other features, elements, components, and / or combinations thereof. In addition, the use of the term "at least one" when used in this specification, particularly in the claims, means that there is one or more of the listed features, elements, components, and / or combinations thereof. Furthermore, the use of the term "about" when used in this specification, particularly in the claims, means that there are no restrictions on the values of the elements, and that the values of the elements can vary by more than 10% of the value. In addition, when describing the embodiments of the present application, the use of "may" means that one or more embodiments of the present application. Also, the term "exemplary" is intended to mean an example or illustration.

[0081] 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 overly idealized or formal sense unless expressly so defined herein.

[0082] 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 accompanying drawings and in conjunction with the embodiments.

[0083] 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 diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a filter and a protective glass.

[0084] In some embodiments, the first lens can have positive refractive power. The second lens can have positive refractive power, with the object side being concave and the image side being convex. The third lens can have positive refractive power, with both the object side and the image side being convex. The fourth lens can have refractive power. The fifth lens can have refractive power, with the image side being concave. The sixth lens can have positive refractive power, with the object side being convex. The seventh lens can have refractive power, with the object side being convex and the image side being concave.

[0085] In some embodiments, the object side curvature radius R1 of the first lens and the image side curvature radius R2 of the first lens satisfy: |(R1+R2) / (R1-R2)|>10.0. By satisfying the above range, the adoption of a meniscus lens can control the direction of light, increase the depth of field, reduce spherical aberration, correct coma, increase light utilization, and improve stability.

[0086] In some embodiments, the object side curvature radius R3 of the second lens and the image side curvature radius R4 of the second lens satisfy: (R3+R4) / (R3-R4)>5.0. By satisfying the above range, the adoption of a meniscus lens can further control the smoothness of the light path, making the light more concentrated, while reducing the spherical aberration of the optical lens and improving the imaging quality of the optical lens.

[0087] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f satisfy: 1.5<TTL / f<2.5. By satisfying the above range, it is beneficial to achieve a balance between small volume and long focal length of the optical lens, so that the lens has a longer field of view distance while having a smaller volume.

[0088] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV and the real image height ih corresponding to the maximum half field of view satisfy: 0.9 < ih / (f*tan(FOV / 2)) < 1.1. Satisfying the above range can reduce the distortion of the image edge, improve the overall image quality, reduce the difficulty of post-image processing, reduce the influence of temperature drift, and improve the stability and reliability of the optical lens.

[0089] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO satisfy: 12.0° < FOV / FNO < 25.0°. Satisfying the above range increases the amount of light entering the optical lens, improves night imaging quality and reduces noise, and has a greater depth of field, which can clearly capture distant targets.

[0090] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: f1 / f > 3.0. Satisfying the above range makes the first lens have positive focal power, which can improve the edge field light collection capability while reducing the working aperture of the first lens.

[0091] 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 < 8.0. Satisfying the above range makes the second lens have appropriate positive focal power, which is conducive to converging light while reducing the light deflection angle, allowing the light to smoothly transition, and improving the imaging quality of the optical lens.

[0092] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.5 < f3 / f < 2.0. Satisfying the above range makes the third lens have appropriate positive focal power, which is conducive to converging light while reducing the light deflection angle, allowing the light to smoothly transition, and improving the imaging quality of the optical lens.

[0093] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -0.5 < f4 / f < 1.1. Satisfying the above range makes the fourth lens have appropriate focal power, allowing the light to smoothly transition, and improving the imaging quality of the optical lens.

[0094] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.6 < f5 / f < 1.6. Satisfying the above range makes the fifth lens have appropriate focal power, allowing the light to smoothly transition, and improving the imaging quality of the optical lens.

[0095] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0.5 < f6 / f < 6.5. Satisfying the above range makes the sixth lens have proper positive refractive power, is beneficial to the smooth transition of light rays, corrects various aberrations of the optical lens, and improves the imaging quality of the optical lens.

[0096] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -2.0 < f7 / f < 3.0. Satisfying the above range makes the seventh lens have proper refractive power, is beneficial to the smooth transition of light rays, corrects various aberrations of the optical lens, and improves the imaging quality of the optical lens.

[0097] In some embodiments, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: BFL / f > 0.25. Satisfying the above range can reduce the interference of aberrations such as aberration and coma, improve the resolution and clarity of imaging, and improve the stability of the optical lens.

[0098] In some embodiments, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: f12 / f > 1.6. Satisfying the above range can suppress the divergence angle of the light beam, make the light beam more concentrated, improve the resolution and contrast of the optical system, and reduce the spherical aberration of the optical lens and improve the imaging quality of the optical lens.

[0099] In some embodiments, the effective focal length f of the optical lens and the combined focal length f36 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy: f36 / f > 1.0. Satisfying the above range can control the propagation direction of the light rays, make the light rays better transmitted to the imaging surface, improve the relative luminance and resolution of the optical lens, increase the depth of field of the optical lens, make the objects near the imaging surface clearer, and improve the imaging quality of the optical lens.

[0100] 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 eccentric sensitivity of the optical lens, balance the aberration of the optical lens, improve the imaging quality of the optical lens, reduce the assembly sensitivity of the optical lens, and further reduce the processing difficulty of the optical lens and improve the assembly yield of the optical lens.

[0101] In order to make the system have better optical performance, aspherical lenses are used in the lens, and the shape of each aspherical surface of the optical lens satisfies the following equation:

[0102]

[0103] 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 of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic curved surface coefficient, A, B, C, D, E, F are the second order, fourth order, sixth order, eighth order, tenth order, and twelfth order curved surface coefficients respectively.

[0104] 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 merely the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any change, substitution, combination or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and all are included in the protection scope of the application.

[0105] Embodiment 1

[0106] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in the embodiment 1 of the application, and the optical lens comprises, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0107] The first lens L1 has positive focal power, the object side S1 is a concave surface, and the image side S2 is a convex surface;

[0108] The second lens L2 has positive focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface;

[0109] The diaphragm ST;

[0110] The third lens L3 has positive focal power, the object side S5 and the image side S6 are both convex surfaces;

[0111] The fourth lens L4 has negative focal power, the object side S7 and the image side S8 are both concave surfaces;

[0112] The fifth lens L5 has positive focal power, the object side S8 is a convex surface, and the image side S9 is a concave surface;

[0113] The fourth lens L4 and the fifth lens L5 form a cemented lens group, and the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8;

[0114] The sixth lens L6 has positive focal power, the object side S10 and the image side S11 are both convex surfaces;

[0115] The seventh lens L7 has negative focal power, the object side S12 is a convex surface, and the image side S13 is a concave surface;

[0116] The object side S14 and the image side S15 of the filter G1 are both planar;

[0117] The object side S16 and the image side S17 of the protective glass G2 are both planar;

[0118] The imaging surface S18 is planar.

[0119] The related parameters of each lens in the optical lens in Embodiment 1 are shown in Table 1-1.

[0120] Table 1-1

[0121]

[0122]

[0123] The surface type parameters of the aspherical lens of the optical lens in Embodiment 1 are shown in Table 1-2.

[0124] Table 1-2

[0125] Figure 2 K A B C D E F S1 1.11E-01 0.00E+00 -5.09E-05 4.66E-06 4.12E-08 -6.48E-10 8.73E-13 S2 -2.18E+00 0.00E+00 -2.32E-05 1.90E-06 2.54E-08 9.51E-11 -3.39E-12 S5 1.25E+00 0.00E+00 1.84E-04 -2.03E-06 -1.49E-08 4.29E-10 -7.36E-12 S6 2.71E-01 0.00E+00 -9.24E-06 1.30E-06 8.47E-09 -9.52E-10 1.20E-11 S12 1.03E+03 0.00E+00 -2.05E-03 2.81E-05 1.62E-07 -4.11E-08 9.06E-10 S13 -5.34E+00 0.00E+00 -2.21E-04 1.13E-06 6.48E-07 -2.54E-08 3.57E-10

[0126] In this embodiment, the field curvature curve, the F-Tanθ distortion curve, the relative luminance curve, the MTF curve, the axial aberration curve, and the transverse chromatic aberration curve of the optical lens are shown in FIGS. Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 2

[0127] Figure 3 The field curvature curve of Embodiment 1 is shown, which represents the curvature of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.06 mm-0.03 mm, which shows that the optical lens can well correct the field curvature.

[0128] Figure 4 The F-Tanθ distortion curve of Embodiment 1 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within 3%, the image compression in the edge angle region is relatively flat, and the clarity of the unfolded image is effectively improved.

[0129] Figure 5 ​The relative luminance curve of the embodiment 1 is shown, which represents the relative luminance values of different field angles on the imaging plane, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative luminance (unit: %). As can be seen from the figure, the relative luminance value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has good relative luminance.

[0130] Figure 6 The MTF (modulation transfer function) curve of the embodiment 1 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.5 within the full field of view, and the MTF curve uniformly and smoothly decreases from the center to the edge field of view within the range of 0-160 lp / mm, which has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0131] Figure 7 The axial aberration curve of the embodiment 1 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-15 μm-10 μm, which indicates that the optical lens can better correct the axial aberration.

[0132] Figure 8 The axial aberration curve of the embodiment 1 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-15 μm-10 μm, which indicates that the optical lens can better correct the axial aberration.

[0133] Embodiment 2

[0134] Please refer to Figure 9 , which is a structural schematic diagram of the optical lens provided in the embodiment 2 of the present application, and the optical lens of the embodiment is substantially the same as that of the embodiment 1, and the main difference is that the optical parameters such as the curvature radius, the aspheric coefficient, and the thickness of each lens surface are different.

[0135] The related parameters of each lens in the optical lens in the embodiment 2 are shown in Table 2-1.

[0136] Table 2-1

[0137]

[0138] The surface parameters of the aspherical lens of the optical lens in Embodiment 2 are shown in Table 2-2.

[0139] Table 2-2

[0140] Figure 10 K A B C D E F S1 1.26E-01 0.00E+00 -5.09E-05 4.55E-06 4.32E-08 -5.67E-10 -3.46E-12 S2 -2.15E+00 0.00E+00 -2.70E-05 1.94E-06 2.68E-08 4.08E-11 -5.19E-12 S5 1.26E+00 0.00E+00 1.89E-04 -2.04E-06 -2.28E-08 2.83E-10 -1.01E-11 S6 4.79E-01 0.00E+00 -1.22E-05 1.10E-06 7.24E-10 -1.33E-09 1.84E-11 S12 5.41E+03 0.00E+00 -2.13E-03 2.69E-05 -8.71E-08 -4.51E-08 1.76E-09 S13 -6.16E+00 0.00E+00 -4.93E-04 -3.02E-06 5.01E-07 -3.02E-08 1.05E-09

[0141] In this embodiment, the field curvature curve, F-Tanθ distortion curve, relative illumination curve, MTF curve, axial aberration curve, and transverse aberration curve of the optical lens are shown in FIGS. Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 9 、 Figure 10

[0142] Figure 11 The field curvature curve of Embodiment 2 is shown, which represents the curvature of the meridional image surface and sagittal image surface of light rays of different wavelengths, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.1 mm-0.02 mm, which shows that the optical lens can well correct the field curvature.

[0143] Figure 12 The F-Tanθ distortion curve of Embodiment 2 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within 1%, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0144] Figure 13 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 80% at the maximum half field angle, which shows that the optical lens has good relative illumination.

[0145] Figure 14 The MTF (Modulation Transfer Function) curve of Embodiment 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 this embodiment is above 0.4 within the full field of view, and within the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low and high frequency cases. ​

[0146] Figure 15 The axial aberration curve of the optical lens of Example 2 is shown in FIG. 2, 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 ±10 μm, which indicates that the optical lens can correct the axial aberration well.

[0147] Figure 16 The sagittal chromatic aberration curve of the optical lens of Example 2 is shown in FIG. 3, which represents the chromatic aberration of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.55 μm), the horizontal axis represents the sagittal chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1 μm~2 μm, which indicates that the optical lens can correct the chromatic aberration of the edge field and the secondary spectrum of the entire image plane very well.

[0148] Example 3

[0149] Referring to FIG. 4, which shows a structural schematic diagram of the optical lens provided in Example 3 of the present application, the optical lens of the present embodiment is substantially the same as that of Example 1, and the difference mainly lies in that the optical parameters such as the curvature radius, asphericity coefficient, thickness, etc. of each lens surface are different. Figure 17 The related parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.

[0150] Table 3-1

[0151]

[0152] The surface type parameters of the aspheric lenses of the optical lens of Example 3 are shown in Table 3-2.

[0153] Table 3-2

[0154]

[0155]

[0156] In the present embodiment, the field curvature curve, F-Tanθ distortion curve, relative luminance curve, MTF curve, axial aberration curve, and sagittal chromatic aberration curve of the optical lens are shown in FIGS. 5, 6, 7, 8, 9, and 10, respectively.

[0157] Figure 18 Figure 19 Figure 20 Figure 21 Figure 16 Figure 17

[0158] Figure 18 ​​​​​​​The field curvature curve of embodiment 3 is shown, which represents the curvature of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.04mm~ -0.02mm, which shows that the optical lens can well correct the field curvature.

[0159] Figure 19 The F-Tanθ distortion curve of embodiment 3 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within 1%, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0160] Figure 20 The relative luminance curve of embodiment 3 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 70% at the maximum half field angle, which shows that the optical lens has good relative luminance.

[0161] Figure 21 The MTF (Modulation Transfer Function) curve of embodiment 3 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.4 within the full field of view, and within the range of 0~160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low frequency and high frequency conditions.

[0162] Figure 22 The axial aberration curve of embodiment 3 is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within -10μm~12μm, which shows that the optical lens can well correct the axial aberration.

[0163] Figure 23The vertical color aberration curve of the embodiment 3 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, 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.

[0164] Embodiment 4

[0165] Please refer to Figure 24 , which is a structural schematic diagram of the optical lens provided in the embodiment 4 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 diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0166] The first lens L1 has positive focal power, the object side S1 is a concave surface, and the image side S2 is a convex surface;

[0167] The second lens L2 has positive focal power, the object side S3 is a concave surface, and the image side S4 is a convex surface;

[0168] The diaphragm ST;

[0169] The third lens L3 has positive focal power, the object side S5 and the image side S6 are both convex surfaces;

[0170] The fourth lens L4 has positive focal power, the object side S7 and the image side S8 are both convex surfaces;

[0171] The fifth lens L5 has negative focal power, the object side S8 and the image side S9 are both concave surfaces;

[0172] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8;

[0173] The sixth lens L6 has positive focal power, the object side S10 is a convex surface, and the image side S11 is a concave surface;

[0174] The seventh lens L7 has positive focal power, the object side S12 is a convex surface, and the image side S13 is a concave surface;

[0175] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0176] The object side S16 and the image side S17 of the protective glass G2 are both flat surfaces;

[0177] The imaging surface S18 is a flat surface.

[0178] The related parameters of each lens in the optical lens in embodiment 4 are shown in table 4-1.

[0179] Table 4-1

[0180]

[0181]

[0182] The surface type parameters of the aspherical lens of the optical lens in embodiment 4 are shown in table 4-2.

[0183] Table 4-2

[0184] Figure 25 K A B C D E F S1 6.38E-01 0.00E+00 7.27E-06 3.31E-06 2.99E-08 -1.01E-09 5.28E-12 S2 -1.98E+00 0.00E+00 6.87E-05 3.13E-06 1.12E-08 -1.65E-10 -1.19E-12 S5 4.82E+01 0.00E+00 3.25E-05 6.08E-08 -1.55E-08 4.93E-10 -6.41E-12 S6 -2.08E-01 0.00E+00 -7.23E-05 -4.15E-07 4.93E-08 -9.62E-10 8.32E-12 S12 -1.51E+00 0.00E+00 -1.03E-05 -2.26E-06 1.75E-07 -6.03E-09 8.83E-11 S13 -6.80E-02 0.00E+00 -5.67E-06 -4.47E-07 2.84E-08 9.73E-10 2.53E-11

[0185] In this embodiment, the field curvature curve, F-Tanθ distortion curve, relative illumination curve, MTF curve, axial aberration curve and transverse chromatic aberration curve of the optical lens are shown in FIGS. 4-1 to 4-6 respectively. Figure 26 、 Figure 27 、 Figure 28 、 Figure 23 、 Figure 24 、 Figure 25

[0186] Figure 26 FIG. 4-1 shows the field curvature curve of embodiment 4, which represents the curvature degree of the meridional image surface and sagittal image surface of light rays with different wavelengths, 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 -0.04mm~0.01mm, which indicates that the optical lens can well correct the field curvature.

[0187] Figure 27 FIG. 4-2 shows the F-Tanθ distortion curve of embodiment 4, which represents the F-Tanθ distortion of light rays with different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -0.6%~0, the image compression in the edge angle region is relatively flat, and the clarity of the unfolded image is effectively improved.

[0188] Figure 28 FIG. 4-3 shows the relative illumination curve of embodiment 4, which represents the relative illumination value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 75% at the maximum half field angle, which indicates that the optical lens has good relative illumination.

[0189] Figure 29 ​The MTF (Modulation Transfer Function) curve of the embodiment 4 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of the embodiment is above 0.5 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0190] Figure 30 The axial aberration curve of the embodiment 4 is shown, which represents the aberration of the optical axis at the imaging surface at each wavelength, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the shift amount of the axial aberration is controlled within-5 μm-15 μm, which shows that the optical lens can better correct the axial aberration.

[0191] Figure 31 The curve of the embodiment 4 is shown, which represents the color difference of different image heights on the imaging surface at each wavelength relative to the center wavelength (0.55 μm), the horizontal axis represents the vertical color difference value (unit: μm) of each wavelength relative to the center wavelength, and the vertical axis represents the normalized field of view angle. It can be seen from the figure that the vertical color difference of the longest wavelength and the shortest wavelength is controlled within 0-2 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.

[0192] Embodiment 5

[0193] Please refer to Figure 32 , which is a structural schematic diagram of the optical lens provided in the embodiment 5 of the present application, and the optical lens of the embodiment is substantially the same as that of the embodiment 4, and the main difference is that the optical parameters such as the curvature radius, the aspheric coefficient, and the thickness of each lens surface are different.

[0194] The related parameters of each lens in the optical lens in the embodiment 5 are shown in Table 5-1.

[0195] Table 5-1

[0196]

[0197]

[0198] The surface type parameters of the aspheric lens of the optical lens in the embodiment 5 are shown in Table 5-2.

[0199] Table 5-2

[0200] Figure 33 K A B C D E F S1 5.38E-01 0.00E+00 1.99E-05 3.27E-06 3.05E-08 -1.01E-09 5.58E-12 S2 -2.08E+00 0.00E+00 7.15E-05 3.15E-06 1.01E-08 -1.25E-10 -1.12E-12 S5 4.64E+01 0.00E+00 3.36E-05 8.67E-08 -1.66E-08 5.20E-10 -4.93E-12 S6 -2.60E-01 0.00E+00 -7.11E-05 -4.86E-07 5.12E-08 -9.34E-10 8.51E-12 S12 -1.45E+00 0.00E+00 -4.18E-06 -2.22E-06 1.82E-07 -5.76E-09 7.38E-11 S13 -9.63E-02 0.00E+00 -9.85E-06 4.67E-07 2.82E-08 -2.89E-10 5.81E-11

[0201] In the present embodiment, the field curvature curve, the F-Tanθ 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. 1-5, respectively. Figure 34 , Figure 35 , Figure 30 , Figure 31 , Figure 32 , Figure 33 .

[0202] Figure 34 FIG. 1 shows the field curvature curve of Example 5, which indicates the curvature of light rays of different wavelengths on the sagittal image surface and the tangential 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 sagittal image surface and the tangential image surface is controlled within -0.04 mm-0, which indicates that the optical lens can well correct the field curvature.

[0203] Figure 35 FIG. 2 shows the F-Tanθ distortion curve of Example 5, which indicates the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within -0.8%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0204] Figure 36 FIG. 3 shows the relative illumination curve of Example 5, which indicates 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 80% at the maximum half field angle, which indicates that the optical lens has good relative illumination.

[0205] Figure 37 FIG. 4 shows the MTF (modulation transfer function) curve of Example 5, which indicates 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 0.5 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.

[0206] Figure 38The axial aberration curve of the optical lens of embodiment 5 is shown in the figure, 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.

[0207] Figure 39 The curve of the axial aberration of the optical lens of embodiment 5 is shown in the figure, 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 0-2 μm, which shows that the optical lens can well correct the color aberration of the edge field and the secondary spectrum of the whole image plane.

[0208] Embodiment 6

[0209] Please refer to Figure 40 , which is a structural schematic diagram of the optical lens provided in embodiment 6 of the present application. The optical lens of the present embodiment is substantially the same as that of embodiment 4, and the difference mainly lies in that the optical parameters such as the curvature radius, asphericity coefficient and thickness of each lens surface are different.

[0210] The related parameters of each lens in the optical lens of embodiment 6 are shown in Table 6-1.

[0211] Table 6-1

[0212]

[0213]

[0214] The surface type parameters of the aspheric lenses of the optical lens of embodiment 6 are shown in Table 6-2.

[0215] Table 6-2

[0216] Figure 41 K A B C D E F S1 6.01E-01 0.00E+00 9.45E-06 3.35E-06 2.83E-08 -1.00E-09 5.78E-12 S2 -2.12E+00 0.00E+00 7.14E-05 3.05E-06 1.36E-08 -1.09E-10 -5.84E-13 S5 5.02E+01 0.00E+00 2.47E-05 1.44E-07 -1.50E-08 4.81E-10 -6.05E-12 S6 -7.40E-01 0.00E+00 -6.49E-05 -4.44E-07 4.72E-08 -9.66E-10 1.04E-11 S12 -1.08E+00 0.00E+00 5.29E-05 -8.08E-07 8.41E-08 -4.54E-09 9.16E-11 S13 6.20E-01 0.00E+00 1.33E-04 -1.93E-06 1.05E-07 -8.67E-09 2.73E-10

[0217] In the present embodiment, the field curvature curve, F-Tanθ distortion curve, relative luminance curve, MTF curve, axial aberration curve and axial aberration curve of the optical lens are shown in Figure 42 、 Figure 37 、 Figure 38 、 Figure 39 、 Figure 40 、 Figure 41 respectively.

[0218] Figure 42The field curvature curve of embodiment 6 is shown, which represents the curvature of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.04mm~0.02mm, which shows that the optical lens can well correct the field curvature.

[0219] Figure 43 The F-Tanθ distortion curve of embodiment 6 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within -0.2%~0.4%, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0220] Figure 44 The relative luminance curve of embodiment 6 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 70% at the maximum half field angle, which shows that the optical lens has good relative luminance.

[0221] Figure 45 The MTF (Modulation Transfer Function) curve of embodiment 6 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.5 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.

[0222] Figure 46 The axial aberration curve of embodiment 6 is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within -10μm~18μm, which shows that the optical lens can well correct the axial aberration.

[0223] Figure 47The vertical color aberration curve of embodiment 6 is shown, which represents the color aberration of each wavelength at different image heights on the imaging surface relative to the central wavelength (0.55 μm), the horizontal axis represents the vertical color aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the vertical color aberration of the longest wavelength and the shortest wavelength is controlled within -1 μm ~ 2 μm, which indicates that the optical lens can very well correct the color aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0224] Embodiment 7

[0225] Please refer to Figure 48 , which is a structural schematic diagram of the optical lens provided in embodiment 7 of the present application. The optical lens of the present embodiment is substantially the same as that of embodiment 4, and the main difference is that the object side S1 of the first lens L1 is a convex surface, the image side S2 of the first lens L1 is a concave surface, and the optical parameters such as the curvature radius, aspheric coefficient, thickness, etc. of each lens surface are different.

[0226] The related parameters of each lens in the optical lens of embodiment 7 are shown in Table 7-1.

[0227] Table 7-1

[0228]

[0229]

[0230] The surface type parameters of the aspheric lens of the optical lens in embodiment 7 are shown in Table 7-2.

[0231] Table 7-2

[0232] Figure 49 K A B C D E F S1 -1.32E+00 0.00E+00 -5.09E-05 -2.81E-06 -1.34E-08 -1.83E-10 3.15E-12 S2 4.24E-01 0.00E+00 -1.97E-05 -3.00E-06 -1.61E-08 -5.62E-11 1.40E-11 S5 4.69E+01 0.00E+00 1.64E-05 4.24E-07 -1.01E-08 8.74E-10 2.56E-11 S6 -1.41E+00 0.00E+00 -5.16E-05 -3.81E-07 6.38E-08 -6.97E-10 1.58E-12 S12 -7.39E-01 0.00E+00 1.16E-04 3.68E-06 -2.14E-08 2.49E-09 -3.04E-11 S13 1.29E+00 0.00E+00 1.36E-04 3.37E-06 1.14E-07 1.33E-08 -1.92E-10

[0233] In the present embodiment, the field curvature curve, F-Tanθ distortion curve, relative luminance curve, MTF curve, axial aberration curve, and vertical color aberration curve of the optical lens are shown in Figure 44 , Figure 45 , Figure 46 , Figure 47 , Figure 48 , Figure 49 .

[0234] ​ The field curvature curve of embodiment 7 is shown, which represents the curvature degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.02 mm ~ 0.08 mm, which indicates that the optical lens can well correct the field curvature.

[0235] ​ The F-Tanθ distortion curve of Example 7 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within -0.5%~2%, and the image compression in the edge angle region is relatively gentle, effectively improving the clarity of the expanded image.

[0236] ​ The relative illumination curve of Example 7 is shown, which represents the relative illumination value of different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 60% at the maximum half field angle, indicating that the optical lens has good relative illumination.

[0237] ​ The MTF (Modulation Transfer Function) curve of Example 7 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the present embodiment is above 0.5 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 both low and high frequency cases.

[0238] ​ The axial aberration curve of Example 7 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within -20μm~10μm, indicating that the optical lens can better correct the axial aberration.

[0239] ​ The sagittal chromatic aberration curve of Example 7 is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.55μm). The horizontal axis represents the sagittal chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm~2μm, indicating that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0240] Please refer to Table 8 for the optical characteristics of the above-mentioned embodiments, including the effective focal length f, the total track length TTL, the aperture value FNO, the real image height ih corresponding to the maximum half field angle, the chief ray angle CRA, the maximum field of view FOV of the optical lens, and the numerical value corresponding to each conditional expression in the embodiments.

[0241] Table 8

[0242]

[0243]

[0244] In summary of the above embodiments, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, improves the imaging quality of the optical lens, and realizes the effects of long focal length, small size, low cost, high resolution, and use in weak light and harsh environments by reasonable configuration of each lens surface and reasonable matching of optical power.

[0245] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0246] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens comprising seven lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: A first lens with positive optical power; A second lens with positive optical power has a concave object side and a convex image side. A third lens with positive optical power has convex surfaces on both its object side and image side. A fourth lens with optical power; The fifth lens, which has optical power, has a concave image-side surface; The sixth lens has positive optical power and its object side is convex. The seventh lens, which has optical power, has a convex object side and a concave image side. The optical power of the fourth lens and the seventh lens are of the same sign, and are opposite to the optical power of the fifth lens. The object-side radius of curvature R1 and the image-side radius of curvature R2 of the first lens satisfy: 10.0 < |(R1+R2) / (R1-R2)| ≤ 239.

59.

2. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R3 and the image-side radius of curvature R4 of the second lens satisfy: 5.0 < (R3 + R4) / (R3 - R4) ≤ 34.

71.

3. The optical lens according to claim 1, characterized in that, The total optical length (TTL) and effective focal length (f) of the optical lens satisfy: 1.5 <TTL / f<2.5。 4. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the true image height ih corresponding to the maximum field of view (FOV) and maximum half field of view satisfy: 0.9 <ih / (f×tan(FOV / 2))<1.1。 5. The optical lens according to claim 1, characterized in that, The maximum field of view (FOV) and aperture value (FNO) of the optical lens satisfy: 12.0° <FOV / FNO<25.0°。 6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy the following condition: 3.0 < f1 / f ≤ 144.

07.

7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 3.5 <f2 / f<8.0。 8. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.5 <f3 / f<2.0。 9. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -0.5 <f4 / f<1.1。 10. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.6 <f5 / f<1.6。

Images