Optical lens
By combining six lenses and using an aspherical lens design, and optimizing optical parameters, the miniaturization problem and low-light imaging problem of automotive optical lenses in long-distance imaging have been solved, achieving high resolution and improved stability.
Patent Information
- Application Number
- CN202311717739.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-14
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2043-12-14
AI Technical Summary
Existing automotive optical lenses have long focal lengths for long-distance imaging, resulting in a long overall lens length, which is not conducive to miniaturization. At the same time, their imaging quality is insufficient in low light or harsh environments.
A six-lens structure is adopted, including a combination of negative and positive optical power lenses. Parameters such as the total optical length and focal length ratio, lens curvature radius and thickness are optimized. Combined with aspherical lenses, the imaging lens is designed to correct aberrations and improve image quality.
It achieves miniaturization of long focal length lenses, improves image quality and imaging capabilities in low light and harsh environments, reduces noise interference and aberration effects, and enhances stability and reliability.
Smart Images
Figure CN117631219B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND
[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are used more and more in intelligent driving, and the position of vehicle optical lenses in the automobile industry is continuously improved.
[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving, which collects environmental information through various lenses combined with sensors to ensure the safety of drivers. The existing front-view lens of ADAS system needs 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 night 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 six 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 positive focal power, the object side surface is convex, and the image side surface is 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, both the object side surface and the image side surface are concave;
[0011] The fifth lens with positive focal power, the object side surface is concave, and the image side surface is convex;
[0012] The sixth lens with negative focal power, the object side surface is convex, and the image side surface is concave;
[0013] The optical total length TTL and the effective focal length f of the optical lens satisfy: TTL / f < 1.65.
[0014] It is further preferred that the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy (R1+R2) / (R1-R2)>10.0.
[0015] It is further preferred that the total track length TTL of the optical lens and the sum CT of the central thicknesses of the first lens to the sixth lens along the optical axis respectively satisfy ∑CT / TTL>0.55.
[0016] It is further preferred that the total track length TTL of the optical lens and the central thickness CT6 of the sixth lens along the optical axis satisfy CT6 / TTL>0.15.
[0017] It is further preferred that the effective focal length f of the optical lens and the real image height ih corresponding to the maximum field of view angle FOV and the maximum half field of view angle satisfy 0.9<ih / (fxtan(FOV / 2))<1.1.
[0018] It is further preferred that the maximum field of view angle FOV of the optical lens and the aperture value FNO satisfy 12.0°<FOV / FNO<22.0°.
[0019] It is further preferred that the effective focal length f of the optical lens and the optical back focal length BFL satisfy BFL / f>0.2.
[0020] It is further preferred that the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy f1 / f<-10.0.
[0021] It is further preferred that the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy 1.4<f2 / f<1.6.
[0022] It is further preferred that the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy 0.8<f3 / f<1.0.
[0023] 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
[0024] 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:
[0025] Figure 1 FIG. 1 is a structure schematic diagram of an optical lens according to an embodiment of the present application.
[0026] Figure 2 Field curvature curve of the optical lens in Embodiment 1 of the present application.
[0027] Figure 3 F-Tanθ distortion curve of the optical lens in Embodiment 1 of the present application.
[0028] Figure 4 Relative luminance curve of the optical lens in Embodiment 1 of the present application.
[0029] Figure 5 MTF curve of the optical lens in Embodiment 1 of the present application.
[0030] Figure 6 Axial aberration curve of the optical lens in Embodiment 1 of the present application.
[0031] Figure 7 Vignetting curve of the optical lens in Embodiment 1 of the present application.
[0032] Figure 8 Structure diagram of the optical lens in Embodiment 2 of the present application.
[0033] Figure 9 Field curvature curve of the optical lens in Embodiment 2 of the present application.
[0034] Figure 10 F-Tanθ distortion curve of the optical lens in Embodiment 2 of the present application.
[0035] Figure 11 Relative luminance curve of the optical lens in Embodiment 2 of the present application.
[0036] Figure 12 MTF curve of the optical lens in Embodiment 2 of the present application.
[0037] Figure 13 Axial aberration curve of the optical lens in Embodiment 2 of the present application.
[0038] Figure 14 Vignetting curve of the optical lens in Embodiment 2 of the present application.
[0039] Figure 15 Structure diagram of the optical lens in Embodiment 3 of the present application.
[0040] Figure 16 Field curvature curve of the optical lens in Embodiment 3 of the present application.
[0041] Figure 17 F-Tanθ distortion curve of the optical lens in Embodiment 3 of the present application.
[0042] Figure 18Relative illuminance curve of the optical lens in Embodiment 3 of the present application.
[0043] Figure 19 MTF curve of the optical lens in Embodiment 3 of the present application.
[0044] Figure 20 Axial aberration curve of the optical lens in Embodiment 3 of the present application.
[0045] Figure 21 Vignetting curve of the optical lens in Embodiment 3 of the present application.
[0046] Figure 22 Structure diagram of the optical lens in Embodiment 4 of the present application.
[0047] Figure 23 Curvature of field curve of the optical lens in Embodiment 4 of the present application.
[0048] Figure 24 F-Tanθ distortion curve of the optical lens in Embodiment 4 of the present application.
[0049] Figure 25 Relative illuminance curve of the optical lens in Embodiment 4 of the present application.
[0050] Figure 26 MTF curve of the optical lens in Embodiment 4 of the present application.
[0051] Figure 27 Axial aberration curve of the optical lens in Embodiment 4 of the present application.
[0052] Figure 28 Vignetting curve of the optical lens in Embodiment 4 of the present application.
[0053] Figure 29 Structure diagram of the optical lens in Embodiment 5 of the present application.
[0054] Figure 30 Curvature of field curve of the optical lens in Embodiment 5 of the present application.
[0055] Figure 31 F-Tanθ distortion curve of the optical lens in Embodiment 5 of the present application.
[0056] Figure 32 Relative illuminance curve of the optical lens in Embodiment 5 of the present application.
[0057] Figure 33 MTF curve of the optical lens in Embodiment 5 of the present application.
[0058] Figure 34 Axial aberration curve of the optical lens in Embodiment 5 of the present application.
[0059] Figure 35 A graph of the sagittal chromatic aberration curve of the optical lens in Embodiment 5 of the present application.
[0060] Figure 36 A schematic view of the structure of the optical lens in Embodiment 6 of the present application.
[0061] Figure 37 A graph of the field curvature curve of the optical lens in Embodiment 6 of the present application.
[0062] Figure 38 An F-Tanθ distortion curve of the optical lens in Embodiment 6 of the present application.
[0063] Figure 39 A graph of the relative illuminance curve of the optical lens in Embodiment 6 of the present application.
[0064] Figure 40 A graph of the MTF curve of the optical lens in Embodiment 6 of the present application.
[0065] Figure 41 A graph of the axial aberration curve of the optical lens in Embodiment 6 of the present application.
[0066] Figure 42 A graph of the sagittal chromatic aberration curve of the optical lens in Embodiment 6 of the present application.
[0067] The following detailed description will further describe the present application with reference to the above-described drawings. DETAILED DESCRIPTION
[0068] For a better understanding of the present application, various aspects of the present application will be described in relation to the drawings. It is to be understood that these detailed descriptions are merely descriptive of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.
[0069] It is to be noted that the expressions first, second, third and the like in the present specification are used only to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.
[0070] 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.
[0071] In the present disclosure, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.
[0072] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "may" means one or more embodiments of the present application. Also, the word "exemplary" is intended to mean an example or an illustration.
[0073] 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.
[0074] 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.
[0075] The optical lens of the embodiments of the present application comprises, in order from the object side to the image plane along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a filter, and a protective glass. A diaphragm can be arranged between the first lens and the second lens, or between the second lens and the third lens, or between the object side and the first lens.
[0076] 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 positive focal power, the object side surface of which is convex, and the image side surface of which is 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, both the object side surface and the image side surface of which are concave. The fifth lens can have a positive focal power, the object side surface of which is concave, and the image side surface of which is convex. The sixth lens can have a negative focal power, the object side surface of which is convex, and the image side surface of which is concave.
[0077] In some embodiments, the optical total length TTL of the optical lens and the effective focal length f satisfy: TTL / f < 1.65. Satisfying the above range can effectively limit the length of the optical lens, and is conducive to realizing the miniaturization of the optical lens.
[0078] In some embodiments, the object-side surface radius of curvature R1 of the first lens and the image-side surface radius of curvature R2 of the first lens satisfy: (R1+R2) / (R1-R2) > 10.0. Satisfying the above range, the first lens adopts a meniscus lens to control the direction of light, increase the depth of field, reduce spherical aberration, correct coma, increase light utilization, and improve stability.
[0079] In some embodiments, the optical total length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis satisfy: ∑CT / TTL > 0.55. Satisfying the above range can increase the focal length of the optical lens, and can receive a more distant or wider range of scenes.
[0080] In some embodiments, the optical total length TTL of the optical lens and the central thickness CT6 of the sixth lens along the optical axis satisfy: CT6 / TTL > 0.15. Satisfying the above range can correct spherical aberration and coma, improve the clarity and contrast of the image; has strong light convergence ability, improves the relative luminance of the optical lens, increases the light utilization, and reduces noise interference.
[0081] 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 FOV and the maximum half field of view angle satisfy: 0.9 < ih / (f x 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.
[0082] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value FNO satisfy: 12.0° < FOV / FNO < 22.0°. Satisfying the above range can increase the amount of light of the optical lens, improve the night imaging quality and reduce noise; has a greater depth of field, and can clearly shoot a long-distance target.
[0083] In some embodiments, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: BFL / f > 0.2. 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.
[0084] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f <-10.0. Satisfying the above range can make the first lens have a negative refractive power, reduce the influence of the distortion generated by the first lens itself on the overall distortion of the optical lens, reduce the difficulty of correcting the distortion by the rear lens, and help to reduce the angle of the incident light and inhibit the occurrence of high-order aberrations.
[0085] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.4 < f2 / f < 1.6. Satisfying the above range can make the second lens have a proper positive refractive power, the light ray has a smooth trend, and the aberration caused by the negative refractive power of the first lens can be balanced, that is, the edge aberration of the optical lens can be corrected, and the imaging resolution is improved.
[0086] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.8 < f3 / f < 1.0. Satisfying the above range can make the third lens have a proper positive refractive power, converge the light rays while reducing the light deflection angle, and improve the imaging quality of the optical lens.
[0087] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -0.8 < f4 / f < -0.6. Satisfying the above range can make the fourth lens have a proper negative refractive power, help to increase the imaging area, and improve the imaging quality of the optical lens.
[0088] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.9 < f5 / f < 1.1. Satisfying the above range can make the fifth lens have a proper positive refractive power, converge the light rays while reducing the light deflection angle, make the light ray have a smooth trend, balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.
[0089] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.6 < f6 / f < -1.0. Satisfying the above range can make the sixth lens have a proper negative refractive power, increase the image height, optimize the chromatic aberration of the optical lens, and improve the imaging quality of the optical lens.
[0090] In some embodiments, the third lens and the fourth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to eccentricity, 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.
[0091] In order to make the system have better optical performance, aspherical lenses are adopted in the lens, and the shape of each aspherical surface of the optical lens satisfies the following equation:
[0092]
[0093] 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 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.
[0094] 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 the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any change, replacement, combination or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement mode, and all are included in the protection scope of the application.
[0095] Embodiment 1
[0096] 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 diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1 and a protective glass G2.
[0097] The first lens L1 has negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;
[0098] The diaphragm ST;
[0099] The second lens L2 has positive focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;
[0100] The third lens L3 has positive focal power, and the object side surface S5 and the image side surface S6 are both convex surfaces;
[0101] The fourth lens L4 has negative focal power, and the object side surface S6 and the image side surface S7 are both concave surfaces;
[0102] The third lens L3 and the fourth lens L4 form a cemented lens group, that is, the cemented surface of the image side surface of the third lens L3 and the object side surface of the fourth lens L4 is S6;
[0103] The fifth lens L5 has positive focal power, the object side surface S8 is a concave surface, and the image side surface S9 is a convex surface;
[0104] The sixth lens L6 has negative refractive power, the object side S10 is a convex surface, and the image side S11 is a concave surface;
[0105] The object side S12 and the image side S13 of the filter G1 are both flat surfaces;
[0106] The object side S14 and the image side S15 of the protective glass G2 are both flat surfaces;
[0107] The imaging surface S16 is a flat surface.
[0108] The related parameters of each lens in the optical lens in Embodiment 1 are shown in Table 1-1.
[0109] Table 1-1
[0110]
[0111] The surface type parameters of the aspherical lens of the optical lens in Embodiment 1 are shown in Table 1-2.
[0112] Table 1-2
[0113] Surface number K A B C D E F S1 -2.03E+00 0.00E+00 7.80E-05 -1.74E-06 3.65E-09 -1.55E-09 4.53E-11 S2 -2.00E+00 0.00E+00 -1.94E-04 -1.29E-06 -7.94E-08 -7.58E-10 1.14E-10 S3 -2.11E-02 0.00E+00 -5.31E-04 -3.50E-06 -1.14E-07 -1.84E-09 2.05E-10 S4 2.33E+01 0.00E+00 -2.23E-04 -7.35E-06 -3.45E-08 8.33E-10 6.13E-11 S8 5.00E+01 0.00E+00 2.66E-04 -5.15E-06 -3.47E-08 -9.09E-10 -8.93E-13 S9 -4.79E+00 0.00E+00 1.81E-04 -2.54E-06 -8.41E-08 -6.12E-10 8.35E-12 S10 -8.36E+00 0.00E+00 -6.99E-05 -7.58E-07 -1.46E-08 5.60E-11 1.98E-11 S11 -5.75E+00 0.00E+00 6.85E-05 -9.92E-07 3.33E-08 4.57E-10 4.35E-11
[0114] In this embodiment, the field curvature curve, the F-Tanθ distortion curve, the relative luminance curve, the MTF curve, the axial aberration curve, and the transverse chromatic aberration curve of the optical lens are shown in FIGS. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7
[0115] Figure 2 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-0.06mm-0.02mm, which shows that the optical lens can well correct the field curvature.
[0116] Figure 3 The F-Tanθ distortion curve of Embodiment 1 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within 1.5%, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.
[0117] Figure 4 The relative luminance curve of the embodiment 1 is shown, which represents the relative luminance values of different field angles on the imaging 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 80% at the maximum half field angle, which indicates that the optical lens has good relative luminance.
[0118] Figure 5 The MTF (modulation transfer function) curve of the embodiment 1 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.5 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 capability in the case of low frequency and high frequency.
[0119] Figure 6 The axial aberration curve of the embodiment 1 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging 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-20 μm-12 μm, which indicates that the optical lens can better correct the axial aberration.
[0120] 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-20 μm-12 μm, which indicates that the optical lens can better correct the axial aberration.
[0121] Embodiment 2
[0122] Please refer to Figure 8 , 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, asphericity coefficient and thickness of each lens surface are different.
[0123] The related parameters of each lens in the optical lens in the embodiment 2 are shown in Table 2-1.
[0124] Table 2-1
[0125]
[0126]
[0127] The surface parameters of the aspherical lens of the optical lens in Example 2 are shown in Table 2-2.
[0128] Table 2-2
[0129] Surface number K A B C D E F S1 -2.02E+00 0.00E+00 7.80E-05 -1.75E-06 3.53E-09 -1.54E-09 4.64E-11 S2 -2.00E+00 0.00E+00 -1.94E-04 -1.26E-06 -7.87E-08 -7.65E-10 1.12E-10 S3 -2.70E-02 0.00E+00 -5.32E-04 -3.55E-06 -1.15E-07 -1.87E-09 2.04E-10 S4 2.33E+01 0.00E+00 -2.21E-04 -7.31E-06 -3.50E-08 7.86E-10 6.05E-11 S8 4.39E+02 0.00E+00 2.63E-04 -4.88E-06 -2.29E-08 -7.09E-10 -2.10E-12 S9 -4.75E+00 0.00E+00 1.80E-04 -2.55E-06 -8.21E-08 -4.90E-10 1.17E-11 S10 -7.88E+00 0.00E+00 -6.66E-05 -8.37E-07 -1.93E-08 -8.36E-11 1.85E-11 S11 -5.89E+00 0.00E+00 2.52E-05 -1.49E-06 4.86E-08 9.05E-10 2.69E-11
[0130] 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. 2-1 to 2-6, respectively. Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14
[0131] Figure 9 FIG. 2-1 shows the field curvature curve of Example 2, 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 -0.04 mm ~ 0.02 mm, which indicates that the optical lens can well correct the field curvature.
[0132] Figure 10 FIG. 2-2 shows the F-Tanθ distortion curve of Example 2, 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% ~ 0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.
[0133] Figure 11 FIG. 2-3 shows the relative illumination curve of Example 2, 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 indicates that the optical lens has good relative illumination.
[0134] Figure 12 FIG. 2-4 shows the MTF (Modulation Transfer Function) curve of Example 2, 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 in the range of 0 ~ 160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low frequency and high frequency cases.
[0135] Figure 13 The axial aberration curve of the optical lens of Example 2 is shown in FIG. 2, which represents the aberration of the optical axis at the imaging plane at each wavelength, and 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 ~ 25 μm, which indicates that the optical lens can well correct the axial aberration.
[0136] Figure 14 The axial aberration curve of the optical lens of Example 2 is shown in FIG. 2, which represents the aberration of the optical axis at the imaging plane at each wavelength, and 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 ~ 25 μm, which indicates that the optical lens can well correct the axial aberration.
[0137] Example 3
[0138] Please refer to Figure 15 , which is 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 stop ST is arranged between the second lens L2 and the third lens L3, and the optical parameters such as the curvature radius, asphericity coefficient and thickness of each lens surface are different.
[0139] The related parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.
[0140] Table 3-1
[0141]
[0142]
[0143] The surface type parameters of the aspheric lenses of the optical lens of Example 3 are shown in Table 3-2.
[0144] Table 3-2
[0145] Surface number K A B C D E F S1 -2.02E+00 0.00E+00 7.85E-05 -1.73E-06 3.71E-09 -1.53E-09 4.76E-11 S2 -2.00E+00 0.00E+00 -1.94E-04 -1.28E-06 -7.85E-08 -7.41E-10 1.12E-10 S3 -2.31E-02 0.00E+00 -5.32E-04 -3.58E-06 -1.19E-07 -2.09E-09 1.97E-10 S4 2.33E+01 0.00E+00 -2.22E-04 -7.25E-06 -2.80E-08 8.30E-10 3.64E-12 S8 5.09E+02 0.00E+00 2.62E-04 -4.47E-06 5.09E-09 -3.14E-10 -4.83E-11 S9 -4.81E+00 0.00E+00 1.82E-04 -2.59E-06 -8.54E-08 -4.27E-10 2.67E-11 S10 -8.18E+00 0.00E+00 -7.13E-05 -9.91E-07 -2.17E-08 -6.51E-11 2.02E-11 S11 -5.48E+00 0.00E+00 6.05E-05 -3.62E-07 7.93E-08 7.48E-10 1.17E-11
[0146] In the present embodiment, the field curvature curve, F-Tanθ distortion curve, relative luminance curve, MTF curve, axial aberration curve and transverse aberration curve of the optical lens are shown in FIGS. 8, 9, 10, 11, 12 and 13, respectively. Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21
[0147] Figure 16 The field curvature curve of Example 3 is shown, which represents the curvature of light rays of different wavelengths on the meridional image surface and 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.
[0148] Figure 17 The F-Tanθ distortion curve of Example 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 2%, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.
[0149] Figure 18 The relative luminance curve of Example 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.
[0150] Figure 19 The MTF (Modulation Transfer Function) curve of Example 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 present 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.
[0151] 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 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 -5μm~15μm, which shows that the optical lens can well correct the axial aberration.
[0152] Figure 21The vertical color aberration curve of embodiment 3 is shown, which represents the color aberration of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.55 μm), the horizontal axis represents the vertical color aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the vertical color aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, which shows that the optical lens can well correct the color aberration of the edge field of view and the secondary spectrum of the entire image plane.
[0153] Embodiment 4
[0154] Referring to Figure 22 , a structural schematic diagram of the optical lens provided in embodiment 4 of the present application is shown, and the optical lens of the present embodiment is substantially the same as that of embodiment 1, and the main difference is that the stop ST is arranged between the second lens L2 and the third lens L3, and the optical parameters such as the curvature radius, aspheric coefficient and thickness of each lens surface are different.
[0155] The related parameters of each lens in the optical lens in embodiment 4 are shown in Table 4-1.
[0156] Table 4-1
[0157]
[0158]
[0159] The surface type parameters of the aspheric lens of the optical lens in embodiment 4 are shown in Table 4-2.
[0160] Table 4-2
[0161] Surface number K A B C D E F S1 -2.03E+00 0.00E+00 7.79E-05 -1.70E-06 3.15E-09 -1.56E-09 5.44E-11 S2 -1.99E+00 0.00E+00 -1.94E-04 -1.43E-06 -7.94E-08 -2.88E-10 1.31E-10 S3 -1.79E-02 0.00E+00 -5.31E-04 -3.58E-06 -1.10E-07 -1.29E-09 2.10E-10 S4 2.30E+01 0.00E+00 -2.28E-04 -7.09E-06 -6.84E-09 1.34E-09 -3.39E-11 S8 1.13E+03 0.00E+00 2.62E-04 -5.51E-06 -1.99E-08 -3.24E-10 -2.88E-11 S9 -4.96E+00 0.00E+00 1.87E-04 -2.60E-06 -9.48E-08 -9.55E-10 -1.50E-11 S10 -7.81E+00 0.00E+00 -5.92E-05 -1.36E-07 -2.37E-08 -1.12E-09 1.89E-12 S11 -5.55E+00 0.00E+00 7.75E-05 1.99E-07 6.31E-08 -4.79E-10 -1.20E-11
[0162] 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 23 , Figure 24 , Figure 25 , Figure 26 , Figure 27 , Figure 28 respectively.
[0163] Figure 23 The field curvature curve of embodiment 4 is shown, which represents the bending degree of light rays of different wavelengths on the meridional image plane and the sagittal 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 meridional image plane and the sagittal image plane is controlled within -0.04 mm-0.02 mm, which shows that the optical lens can well correct the field curvature.
[0164] Figure 24The F-Tanθ distortion curve of embodiment 4 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 3.5%, and the image compression in the edge angle region is relatively gentle, effectively improving the clarity of the expanded image.
[0165] Figure 25 The relative illumination curve of embodiment 4 is shown, which represents the relative illumination values of different field angles on the imaging plane. The horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 80% at the maximum half field angle, indicating that the optical lens has good relative illumination.
[0166] Figure 26 The MTF (Modulation Transfer Function) curve of embodiment 4 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.5 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 low and high frequency conditions.
[0167] Figure 27 The axial aberration curve of embodiment 4 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within -5 μm-15 μm, indicating that the optical lens can better correct the axial aberration.
[0168] Figure 28 The sagittal chromatic aberration curve of embodiment 4 is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.55 μm). The horizontal axis represents the sagittal chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -3 μm-5 μm, 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.
[0169] Embodiment 5
[0170] Please refer to Figure 29The figure shows a schematic diagram of the optical lens provided in Embodiment 5 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the aperture stop ST is set in front of the first lens L1, and the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.
[0171] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.
[0172] Table 5-1
[0173]
[0174]
[0175] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.
[0176] Table 5-2
[0177] Surface number K A B C D E F S1 -2.03E+00 0.00E+00 7.67E-05 -1.76E-06 7.63E-09 -1.13E-09 4.93E-11 S2 -2.00E+00 0.00E+00 -1.98E-04 -1.30E-06 -5.77E-08 2.38E-11 1.24E-10 S3 -1.11E-02 0.00E+00 -5.30E-04 -3.50E-06 -1.09E-07 -1.39E-09 2.25E-10 S4 2.42E+01 0.00E+00 -2.34E-04 -7.52E-06 -4.96E-08 8.51E-10 7.28E-11 S8 2.13E+03 0.00E+00 2.42E-04 -6.08E-06 -6.58E-08 -1.66E-09 -1.30E-11 S9 -5.27E+00 0.00E+00 2.02E-04 -2.62E-06 -1.21E-07 -1.43E-09 3.35E-12 S10 -6.87E+00 0.00E+00 -4.58E-05 4.28E-07 6.42E-09 -6.86E-10 -1.45E-12 S11 -5.67E+00 0.00E+00 3.19E-05 1.63E-06 1.03E-07 2.67E-11 -2.39E-11
[0178] 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 respectively as follows: Figure 30 , Figure 31 , Figure 32 , Figure 33 , Figure 34 , Figure 35 As shown.
[0179] Figure 30 The field curvature curve of Example 5 is shown, which represents the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within -0.04 mm to 0.05 mm, indicating that the optical lens can effectively correct the field curvature.
[0180] Figure 31 The F-Tanθ distortion curve of Example 5 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is controlled within -1% to 2%, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image.
[0181] Figure 32The relative luminance curve of the embodiment 5 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.
[0182] Figure 33 The MTF (modulation transfer function) curve of the embodiment 5 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.5 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 capability in the case of low frequency and high frequency.
[0183] Figure 34 The axial aberration curve of the embodiment 5 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-5 μm-12 μm, which indicates that the optical lens can better correct the axial aberration.
[0184] Figure 35 The axial aberration curve of the embodiment 5 is shown, which represents the axial aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-5 μm-12 μm, which indicates that the optical lens can better correct the axial aberration.
[0185] Embodiment 6
[0186] Please refer to Figure 36 , which is a structural schematic diagram of the optical lens provided in the embodiment 6 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 diaphragm ST is arranged before the first lens L1, and the optical parameters such as the curvature radius, asphericity coefficient and thickness of each lens surface are different.
[0187] The related parameters of each lens in the optical lens in the embodiment 6 are shown in Table 6-1.
[0188] Table 6-1
[0189]
[0190]
[0191] The surface parameters of the aspherical lens of the optical lens in Example 6 are shown in Table 6-2.
[0192] Table 6-2
[0193] Surface number K A B C D E F S1 -2.02E+00 0.00E+00 8.12E-05 -1.50E-06 1.16E-08 -1.32E-09 5.95E-11 S2 -2.02E+00 0.00E+00 -1.98E-04 -1.10E-06 -5.56E-08 2.34E-10 1.16E-10 S3 -2.83E-02 0.00E+00 -5.32E-04 -3.75E-06 -1.15E-07 -1.66E-09 2.10E-10 S4 2.35E+01 0.00E+00 -2.14E-04 -7.18E-06 -4.20E-08 6.43E-10 7.31E-11 S8 7.37E+02 0.00E+00 2.53E-04 -4.70E-06 -8.46E-09 -2.14E-10 -7.61E-12 S9 -4.96E+00 0.00E+00 1.80E-04 -2.75E-06 -8.44E-08 -4.78E-10 2.10E-11 S10 -8.94E+00 0.00E+00 -7.06E-05 -8.60E-07 -2.55E-08 -1.66E-10 1.63E-11 S11 -5.45E+00 0.00E+00 -9.76E-05 -7.57E-07 1.33E-07 1.10E-09 -6.87E-11
[0194] 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. 6-1 to 6-6, respectively. Figure 37 、 Figure 38 、 Figure 39 、 Figure 40 、 Figure 41 、 Figure 42
[0195] Figure 37 The field curvature curve of Example 6 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: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.08 mm, which shows that the optical lens can well correct the field curvature.
[0196] Figure 38 The F-Tanθ distortion curve of Example 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: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -1%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.
[0197] Figure 39 The relative illumination curve of Example 6 is shown, which represents the relative illumination value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 80% at the maximum half field angle, which shows that the optical lens has good relative illumination.
[0198] Figure 40 The MTF (Modulation Transfer Function) curve of the embodiment 6 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.
[0199] Figure 41 The axial aberration curve of the embodiment 6 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-10 μm-12 μm, which indicates that the optical lens can better correct the axial aberration.
[0200] Figure 42 The curve of the embodiment 6 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 ±2 μm, which indicates 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.
[0201] Please refer to Table 7, the optical properties corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value FNO, the maximum half field angle corresponding to the real image height ih, the chief ray angle CRA, the maximum field of view FOV of the optical lens, and the numerical value corresponding to each condition in each embodiment.
[0202] Table 7
[0203]
[0204]
[0205] In summary of the above embodiments, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces the aberration, improves the imaging quality of the optical lens, realizes the effect of having long focal length, small size, low cost, high resolution, and can be used in weak light and harsh environment through the reasonable configuration of each lens surface and the reasonable matching of optical power.
[0206] 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. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0207] 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, six pieces of lenses in total, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, whose object side surface is a convex surface and whose image side surface is a concave surface; a second lens with positive refractive power, whose object side surface is a convex surface and whose image side surface is a concave surface; a third lens with positive refractive power, whose object side surface and image side surface are both convex surfaces; a fourth lens with negative refractive power, whose object side surface and image side surface are both concave surfaces; a fifth lens with positive refractive power, whose object side surface is a concave surface and whose image side surface is a convex surface; a sixth lens with negative refractive power, whose object side surface is a convex surface and whose image side surface is a concave surface; an optical total track length TTL of the optical lens and an effective focal length f satisfy: 1.56 ≤ TTL / f < 1.65; a radius of curvature R1 of the object side surface of the first lens and a radius of curvature R2 of the image side surface of the first lens satisfy: 10.00 < (R1+R2) / (R1-R2) ≤ 15.13; an optical total track length TTL of the optical lens and a central thickness CT6 of the sixth lens along the optical axis satisfy: 0.15 < CT6 / TTL ≤ 0.
19.
2. The optical lens of claim 1, wherein, a radius of curvature R1 of the object side surface of the first lens and a radius of curvature R2 of the image side surface of the first lens satisfy: 14.86 ≤ (R1+R2) / (R1-R2) ≤ 15.
13.
3. The optical lens of claim 1, wherein, an optical total track length TTL of the optical lens and a sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis respectively satisfy: ∑CT / TTL > 0.
55.
4. The optical lens of claim 1, wherein, an optical total track length TTL of the optical lens and a central thickness CT6 of the sixth lens along the optical axis satisfy: 0.16 ≤ CT6 / TTL ≤ 0.
19.
5. The optical lens of claim 1, wherein, an effective focal length f of the optical lens, a maximum field of view FOV and a real image height ih corresponding to a maximum half field of view angle satisfy: 0.9 < ih / (f x tan(FOV / 2)) < 1.
1.
6. The optical lens of claim 1, wherein, a maximum field of view FOV of the optical lens and an aperture value FNO satisfy: 12.0° < FOV / FNO < 22.0°.
7. The optical lens of claim 1, wherein, an effective focal length f of the optical lens and an optical back focal length BFL satisfy: BFL / f > 0.
2.
8. The optical lens of claim 1, wherein, a focal length f1 of the first lens and an effective focal length f of the optical lens satisfy: f1 / f < -10.
0.
9. The optical lens of claim 1, wherein, an effective focal length f of the optical lens and a focal length f2 of the second lens satisfy: 1.4 < f2 / f < 1.
6.
10. The optical lens of claim 1, wherein, an effective focal length f of the optical lens and a focal length f3 of the third lens satisfy: 0.8 < f3 / f < 1.0.
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