Optical lens

Abstract

The application provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an optical axis, and the six lenses comprise a first lens with negative optical power; a second lens with positive optical power, the object side of the second lens is a convex surface, and the image side of the second lens is a concave surface; a third lens with positive optical power, the image side of the third lens is a convex surface; a fourth lens with positive optical power, the object side of the fourth lens is a convex surface; a fifth lens with negative optical power, the image side of the fifth lens is a concave surface; and a sixth lens with negative optical power. The optical lens provided by the application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by optimizing the shape, optical power, thickness and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization and long-focus characteristics.

Description

TECHNICAL FIELD

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

[0002] In recent years, with the rapid development of automobile auxiliary driving technology, optical lenses are increasingly widely used in automobiles.

[0003] At present, higher requirements are put forward for the performance and structure of vehicle-mounted optical lenses for safety and other reasons. For example, due to the demand for updating iteration of the placement position of the lens, the installation position of the lens is limited, and the demand for miniaturization of the lens is increasingly intense. At the same time, the demand for large image surface and small aperture is also increasing, in order to realize high pixel requirements and improve the resolving power, seven, eight or more lens structures are usually selected, but this will seriously affect the miniaturization of the lens.

[0004] Therefore, how to make the optical lens realize large imaging size, small aperture, and long focal characteristics, so as to meet the performance requirements of vehicle-mounted applications, is the goal pursued by the lens in the field. SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages such as small aperture, large image surface, miniaturization, long focal characteristics, etc.

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

[0007] a first lens with negative refractive power;

[0008] a second lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave;

[0009] a third lens with positive refractive power, the image side surface of which is convex;

[0010] a fourth lens with positive refractive power, the object side surface of which is convex;

[0011] a fifth lens with negative refractive power, the image side surface of which is concave;

[0012] a sixth lens with negative refractive power.

[0013] Further preferably, the effective focal length f of the optical lens and the total optical length TTL satisfy: 1.6 < TTL / f < 2.5.

[0014] 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 field of view satisfy: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.05.

[0015] Further preferably, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.55<IH / f<0.7.

[0016] Further preferably, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2<BFL / f<0.45.

[0017] Further preferably, the real image height IH corresponding to the maximum field angle, the total track length TTL and the maximum field angle FOV of the optical lens satisfy: 53.0<180°xTTL / (IH / 2) / (FOV / 2)<80.0.

[0018] Further preferably, the sum ∑CT of the central thicknesses of the first to sixth lenses and the total track length TTL of the optical lens satisfy: 0.5<∑CT / TTL<0.85.

[0019] Further preferably, the maximum field angle FOV, the real image height IH corresponding to the maximum field angle and the entrance pupil diameter D1 of the first lens of the optical lens satisfy: 3.0<D1 / IH / tan(FOV / 2)<4.5.

[0020] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f<-1.3.

[0021] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.2<f2 / f.

[0022] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.9<f3 / f<2.4.

[0023] Further preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.8<f4 / f<1.3.

[0024] Further preferably, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.2<f5 / f<-0.5.

[0025] Further preferably, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f<-1.2.

[0026] Further preferably, the effective focal length f of the optical lens and the image-side surface curvature radius R6 of the third lens satisfy: -2.0<R6 / f<-0.5.

[0027] It is further preferred that an effective focal length f of the optical lens and a curvature radius R7 of the object side of the fourth lens satisfy: 0.5 < R7 / f < 0.9.

[0028] It is further preferred that an effective focal length f of the optical lens and a curvature radius R10 of the image side of the fifth lens satisfy: 0.4 < R10 / f < 1.3.

[0029] It is further preferred that a curvature radius R3 of the object side of the second lens and a curvature radius R4 of the image side of the second lens satisfy: -0.96 < (R3-R4) / (R3+R4) < -0.01.

[0030] The optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by optimizing the shape, optical power, thickness, and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization, long focal length, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0031] 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:

[0032] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0033] Figure 2 FIG. 2 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0034] Figure 3 FIG. 3 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0035] Figure 4 FIG. 4 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0036] Figure 5 FIG. 5 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0037] Figure 6 FIG. 6 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0038] Figure 7 FIG. 7 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0039] Figure 8 FIG. 8 is an MTF curve diagram of the optical lens according to the embodiment of the present application.

[0040] Figure 9 FIG. 9 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0041] Figure 10 MTF curve diagram of the optical lens in embodiment 5 of the present application.

[0042] Figure 11 Structure schematic diagram of the optical lens in embodiment 6 of the present application.

[0043] Figure 12 MTF curve diagram of the optical lens in embodiment 6 of the present application.

[0044] Figure 13 Structure schematic diagram of the optical lens in embodiment 7 of the present application.

[0045] Figure 14 MTF curve diagram of the optical lens in embodiment 7 of the present application.

[0046] Figure 15 Structure schematic diagram of the optical lens in embodiment 8 of the present application.

[0047] Figure 16 MTF curve diagram of the optical lens in embodiment 8 of the present application.

[0048] Figure 17 Structure schematic diagram of the optical lens in embodiment 9 of the present application.

[0049] Figure 18 MTF curve diagram of the optical lens in embodiment 9 of the present application.

[0050] Figure 19 Structure schematic diagram of the optical lens in embodiment 10 of the present application.

[0051] Figure 20 MTF curve diagram of the optical lens in embodiment 10 of the present application.

[0052] Figure 21 Structure schematic diagram of the optical lens in embodiment 11 of the present application.

[0053] Figure 22 MTF curve diagram of the optical lens in embodiment 11 of the present application.

[0054] Figure 23 Structure schematic diagram of the optical lens in embodiment 12 of the present application.

[0055] Figure 24 MTF curve diagram of the optical lens in embodiment 12 of the present application.

[0056] Figure 25 Structure schematic diagram of the optical lens in embodiment 13 of the present application.

[0057] Figure 26 MTF curve diagram of the optical lens in embodiment 13 of the present application.

[0058] Figure 27 Structure diagram of the optical lens in Embodiment 14 of the present application.

[0059] Figure 28 MTF curve diagram of the optical lens in Embodiment 14 of the present application.

[0060] Figure 29 Structure diagram of the optical lens in Embodiment 15 of the present application.

[0061] Figure 30 MTF curve diagram of the optical lens in Embodiment 15 of the present application.

[0062] Figure 31 Structure diagram of the optical lens in Embodiment 16 of the present application.

[0063] Figure 32 MTF curve diagram of the optical lens in Embodiment 16 of the present application.

[0064] Figure 33 Structure diagram of the optical lens in Embodiment 17 of the present application.

[0065] Figure 34 MTF curve diagram of the optical lens in Embodiment 17 of the present application.

[0066] Figure 35 Structure diagram of the optical lens in Embodiment 18 of the present application.

[0067] Figure 36 MTF curve diagram of the optical lens in Embodiment 18 of the present application.

[0068] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0069] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the description, like reference numerals refer to like elements. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0070] It should be noted that the expressions first, second, third, etc. in the present specification are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, 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.

[0071] 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.

[0072] In this document, the paraxial region refers to a region near the optical axis. If the 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 the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging surface is referred to as the image side surface of the lens.

[0073] 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 expressions such as "at least one of" appear after a list of items, it modifies the entire list of items and does not modify the individual items in the list. Furthermore, when describing embodiments of the present application, the word "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0074] 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.

[0075] 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 drawings and in conjunction with the embodiments.

[0076] The optical lens provided by the embodiments of the present application comprises six lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens.

[0077] In some embodiments, the first lens has a negative focal power, which is conducive to diverging light rays. Under the same field of view angle condition, the light rays emitted from the image side surface of the first lens can make the subsequent optical system have a larger light ray acceptance surface, thereby reducing the front aperture.

[0078] In some embodiments, the second lens has positive refractive power, which is conducive to converging light rays, and in combination with the first lens having negative refractive power, can reduce the total length of the optical lens and further reduce the rear aperture. The object side of the second lens is convex, and the image side is concave, which can receive the divergent light rays from the first lens and converge the divergent light rays quickly, avoid the divergent light rays from exiting the lens, reduce the loss of light energy, and make the convergent light rays smoothly enter the rear, further stabilize the light path, reduce the loss of light energy, and improve the illumination of the peripheral field of view.

[0079] In some embodiments, the third lens has positive refractive power, which is conducive to receiving the convergent light rays from the second lens, reducing the height of the light beam when incident on the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens. The image side of the third lens is convex, which can deflect the edge-of-field light rays toward the optical axis after passing through the image side of the third lens, and is conducive to reducing the rear aperture of the system.

[0080] In some embodiments, the fourth lens has positive refractive power, which is conducive to converging light rays, and in combination with the fifth lens, can effectively correct the aberration of the optical lens, improve the imaging quality, and optimize the distortion and other optical performance. The object side of the fourth lens is convex, which can compress the light rays, make them smoothly incident on the fifth lens, reduce the sensitivity of the optical lens, and enable the light rays to turn faster to reach the image plane, thereby reducing the total length of the optical lens.

[0081] In some embodiments, the fifth lens has negative refractive power, which is conducive to diverging light rays, enabling the subsequent optical system to have a larger light acceptance surface, improving the optical performance, effectively correcting various aberrations caused by the front lens, and improving the imaging quality of the optical lens. The image side of the fifth lens is concave, which can diverge the central field of view light rays, enable the light rays to reach a higher imaging position, and reduce the incidence angle of the light rays entering the chip, which helps to improve the illumination and reduce the chromatic aberration.

[0082] In some embodiments, the sixth lens has negative refractive power, which is conducive to diverging light rays, enabling the peripheral light rays and the central light rays to turn upward and reach a higher imaging position, and increasing the imaging area of the optical lens.

[0083] In some embodiments, the optical lens can further include a stop, which can be located between the first lens and the second lens. It can be understood that the stop is used to limit the amount of incoming light to change the brightness of the image. When the stop is located between the first lens and the second lens, it is conducive to effectively converging the light rays entering the optical lens, reducing the aperture of the lenses at the rear end of the optical system, and reducing the sensitivity of the optical lens. However, it should be noted that the position of the stop disclosed herein is only an example and not a limitation; in alternative embodiments, the stop can also be arranged at other positions as needed.

[0084] In some embodiments, the optical lens can further include a filter and / or a protective glass disposed between the sixth lens and the imaging surface, capable of filtering light with different wavelengths and preventing damage to the image-side elements (e.g., a chip) of the optical lens.

[0085] In some embodiments, the effective focal length f of the optical lens and the total track length TTL satisfy: 1.6 < TTL / f < 2.5. Satisfying the above range means that the optical length of the optical lens can be effectively limited, which is conducive to the miniaturization of the optical lens.

[0086] In some embodiments, the effective focal length f of the optical lens and the maximum field of view FOV and the real image height IH corresponding to the maximum field of view satisfy: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.05. Satisfying the above range means that the optical distortion of the optical lens can be controlled within a small range, which is conducive to improving the imaging quality of the optical lens.

[0087] 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 satisfy: 0.55 < IH / f < 0.7. Satisfying the above range means that the optical lens can achieve a larger imaging surface, which is conducive to improving the imaging quality of the optical lens.

[0088] In some embodiments, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2 < BFL / f < 0.45. Satisfying the above range means that the optical lens has a longer back focus, which is conducive to reducing the assembly of the interference module and improving the production yield.

[0089] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens, the total track length TTL, and the maximum field of view FOV satisfy: 53.0 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.0. Satisfying the above range can balance between large image height, long focal length, and miniaturization, and improve the imaging quality of the optical lens.

[0090] In some embodiments, the sum ∑CT of the center thicknesses of the first lens to the sixth lens and the total track length TTL of the optical lens satisfy: 0.5 < ∑CT / TTL < 0.85. Satisfying the above range is conducive to compressing the total length and volume of the optical lens and maintaining the miniaturization of the optical lens.

[0091] In some embodiments, the maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view, and the object-side light entrance aperture D1 of the first lens satisfy: 3.0 < D1 / IH / tan(FOV / 2) < 4.5. Satisfying the above range can ensure that the front aperture size of the optical lens is balanced between the field of view and the image surface, and improve the imaging quality of the optical lens.

[0092] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f <-1.3. Satisfying the above range is beneficial for diverging light rays, and the light rays exiting the first lens image side can make the subsequent optical system have a larger light ray acceptance surface under the same field of view angle condition, reducing the front aperture.

[0093] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.2 < f2 / f. Satisfying the above range is beneficial for converging light rays, and in combination with the first lens having negative refractive power, the total length of the optical lens can be reduced, and the converging effect of the light rays can further reduce the rear aperture.

[0094] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.9 < f3 / f < 2.4. Satisfying the above range is beneficial for receiving light rays converged from the second lens, reducing the height of the light beam when incident to the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens.

[0095] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.8 < f4 / f < 1.3. Satisfying the above range is beneficial for converging light rays, and in combination with the fifth lens, the aberration of the optical lens can be effectively corrected, the imaging quality is improved, and the optical performance such as distortion is optimized.

[0096] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.2 < f5 / f < -0.5. Satisfying the above range is beneficial for diverging light rays, making the subsequent optical system have a larger light ray acceptance surface, and improving the optical performance can effectively correct various aberrations caused by the front lens, improving the imaging quality of the optical lens.

[0097] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f <-1.2. Satisfying the above range is beneficial for diverging light rays, making the peripheral light rays and the central light rays turn upward to reach a higher imaging position, increasing the imaging area of the optical lens.

[0098] In some embodiments, the effective focal length f of the optical lens and the image side curvature radius R6 of the third lens satisfy: -2.0 < R6 / f < -0.5. Satisfying the above range can make the edge field of view light rays be deflected in the direction of the optical axis after passing through the image side of the third lens, which is beneficial for reducing the rear aperture of the system.

[0099] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.5 < R7 / f < 0.9. Satisfying the above range can compress the light rays, make the light rays smoothly incident to the fifth lens, reduce the sensitivity of the optical lens, and make the light rays turn faster to reach the image plane, thereby reducing the total length of the optical lens.

[0100] In some embodiments, the effective focal length f of the optical lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 0.4 < R10 / f < 1.3. Satisfying the above range can diverge the central field of view light rays, make the light rays reach a higher imaging position, and reduce the incidence angle of the light rays entering the chip, thereby improving the illumination and reducing the chromatic aberration.

[0101] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface satisfy: -0.96 < (R3-R4) / (R3+R4) < -0.01. Satisfying the above range can accept the diverging light rays from the first lens, quickly converge the diverging light rays, avoid the diverging light rays from exiting the lens, reduce the light energy loss, and make the diverging light rays smoothly enter the rear, thereby further stabilizing the light ray trend, reducing the light energy loss, and improving the illumination of the peripheral field of view.

[0102] In some embodiments, the fourth lens and the fifth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens. The glued lens can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0103] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens can be spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0104] In various embodiments of the present application, when the lens is an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0105]

[0106] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0107] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0108] Embodiment 1

[0109] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in 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 and a filter G1.

[0110] The first lens L1 has negative focal power, the object side S1 is a concave surface, and the image side S2 is a convex surface; the second lens L2 has positive focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface; the third lens L3 has positive focal power, the object side S5 and the image side S6 are both convex surfaces; the fourth lens L4 has positive focal power, the object side S7 and the image side

[0111] S8 are both convex surfaces; the fifth lens L5 has negative focal power, the object side S8 and the image side S9 are both concave surfaces, and the fourth lens L4 and the fifth lens L5 form a cemented lens, and the cemented surface is S8; the sixth lens L6 has negative focal power, the object side S10 is a convex surface, and the image side S11 is a concave surface; the object side S12 and the image side S13 of the filter G1 are both flat surfaces; and the imaging surface S14 is a flat surface.

[0112] The first lens L1, the third lens L3, the fourth lens L4 and the fifth lens L5 are glass spherical lenses; the second lens

[0113] L2 and the sixth lens L6 are glass aspherical lenses.

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

[0115] Table 1-1

[0116]

[0117] The surface type parameters of the aspherical lens of the optical lens in embodiment 1 are shown in table 1-2.

[0118] Table 1-2

[0119] Face number K A B C D E F S3 -5.19E+00 0.00E+00 0.00E+00 -5.87E-06 2.80E-07 -6.87E-09 5.63E-11 S4 1.00E+01 0.00E+00 0.00E+00 -8.34E-07 4.38E-08 -6.78E-10 3.56E-12 S10 -3.06E+00 0.00E+00 -2.82E-03 1.03E-04 -6.66E-06 2.99E-07 -4.78E-09 S11 -6.02E+00 0.00E+00 -1.57E-03 1.03E-04 -7.49E-06 3.50E-07 -5.65E-09

[0120] In the present embodiment, Figure 2 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. It can be seen from the figure that the MTF value of the present embodiment is above 0.3 in the full field of view, and in the range of 0-120 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 the case of low frequency and high frequency.

[0121] Embodiment 2

[0122] Please refer to Figure 3 , which is a structural schematic diagram of the optical lens provided in the embodiment 2 of the present application. Compared with the embodiment 1, the main difference of the present embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness 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] The surface type parameters of the aspherical lens of the optical lens in the embodiment 2 are shown in Table 2-2.

[0127] Table 2-2

[0128] Face number K A B C D E F S3 -9.02E+00 0.00E+00 0.00E+00 -6.29E-06 2.63E-07 -6.93E-09 6.51E-11 S4 -1.00E+01 0.00E+00 0.00E+00 -8.56E-07 3.96E-08 -9.82E-10 1.07E-11 S10 -3.02E+00 0.00E+00 1.60E-03 -1.20E-04 7.97E-06 -2.93E-07 4.15E-09 S11 1.01E+01 0.00E+00 2.85E-03 -1.23E-04 8.37E-06 -2.86E-07 3.93E-09

[0129] It can be seen from Figure 4 that the MTF value of the present embodiment is above 0.3 in the full field of view, and in the range of 0-120 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 the case of low frequency and high frequency.

[0130] Embodiment 3

[0131] Please refer to Figure 5 , which is a structural schematic diagram of the optical lens provided in the embodiment 3 of the present application. Compared with the embodiment 1, the main difference of the present embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0132] The related parameters of each lens in the optical lens in the embodiment 3 are shown in Table 3-1.

[0133] Table 3-1

[0134]

[0135] The surface profile parameters of the aspherical lens of the optical lens in Embodiment 3 are shown in Table 3-2.

[0136] Table 3-2

[0137] Face number K A B C D E F S3 -4.38E+00 0.00E+00 0.00E+00 -5.62E-06 2.71E-07 -7.38E-09 6.91E-11 S4 2.01E+01 0.00E+00 0.00E+00 -1.25E-06 3.86E-08 -8.49E-10 6.19E-12 S10 -9.52E-01 0.00E+00 -1.87E-03 3.45E-05 -7.28E-06 3.67E-07 -5.49E-09 S11 -7.14E-01 0.00E+00 -1.74E-03 3.00E-05 -6.49E-06 3.94E-07 -6.50E-09

[0138] It can be seen from Figure 6 that the MTF values of the present embodiment are all above 0.3 in the full field of view, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and have good imaging quality and good detail resolution ability in both low and high frequency cases.

[0139] Embodiment 4

[0140] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens provided in Embodiment 4 of the present application. Compared with Embodiment 1, the main difference of the present embodiment is that the optical parameters such as the radii of curvature of the lens surfaces and the lens thicknesses are different.

[0141] The related parameters of the lenses in the optical lens in Embodiment 4 are shown in Table 4-1.

[0142] Table 4-1

[0143]

[0144]

[0145] The surface profile parameters of the aspherical lens of the optical lens in Embodiment 4 are shown in Table 4-2.

[0146] Table 4-2

[0147] Face number K A B C D E F S3 -3.52E+00 0.00E+00 0.00E+00 -5.72E-06 2.59E-07 -7.61E-09 7.83E-11 S4 1.43E+01 0.00E+00 0.00E+00 -1.40E-06 2.54E-08 -6.60E-10 5.32E-12 S10 -2.12E+00 0.00E+00 2.60E-03 -9.93E-05 5.37E-06 -2.56E-07 4.83E-09 S11 -3.87E+00 0.00E+00 2.98E-03 -7.50E-05 6.07E-06 -3.08E-07 5.81E-09

[0148] It can be seen from Figure 8 that the MTF values of the present embodiment are all above 0.2 in the full field of view, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and have qualified imaging quality and qualified detail resolution ability in both low and high frequency cases.

[0149] Embodiment 5

[0150] Please refer to Figure 9 , which is a structural schematic diagram of the optical lens provided in Embodiment 5 of the present application. Compared with Embodiment 1, the main difference of the present embodiment is that the optical parameters such as the radii of curvature of the lens surfaces and the lens thicknesses are different.

[0151] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0152] Table 5-1

[0153]

[0154]

[0155] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.

[0156] Table 5-2

[0157]

[0158] from Figure 10 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0159] Example 6

[0160] Please see Figure 11 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 6 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0161] The relevant parameters of each lens in the optical lens of Example 6 are shown in Table 6-1.

[0162] Table 6-1

[0163]

[0164]

[0165] The surface profile parameters of the aspherical lens in the optical lens of Example 6 are shown in Table 6-2.

[0166] Table 6-2

[0167] Face number K A B C D E F S3 -5.37E+00 0.00E+00 0.00E+00 -5.80E-06 2.64E-07 -7.37E-09 7.31E-11 S4 1.19E+01 0.00E+00 0.00E+00 -7.91E-07 4.04E-08 -8.89E-10 8.18E-12 S10 -7.44E-01 0.00E+00 1.87E-03 -5.82E-05 6.74E-06 -3.40E-07 5.70E-09 S11 -5.50E+00 0.00E+00 1.67E-03 -5.41E-05 7.46E-06 -3.40E-07 5.31E-09

[0168] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0169] Example 7

[0170] Please see Figure 13 The figure shown is a schematic diagram of the structure of the optical lens provided in Embodiment 7 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0171] The relevant parameters of each lens in the optical lens of Example 7 are shown in Table 7-1.

[0172] Table 7-1

[0173]

[0174]

[0175] The surface profile parameters of the aspherical lens in Example 7 are shown in Table 7-2.

[0176] Table 7-2

[0177] Face number K A B C D E F S3 -3.39E+00 0.00E+00 0.00E+00 -5.79E-06 2.48E-07 -7.42E-09 7.54E-11 S4 1.69E+01 0.00E+00 0.00E+00 -1.43E-06 2.56E-08 -7.33E-10 6.07E-12 S10 -5.67E-01 0.00E+00 1.65E-03 -5.02E-05 6.62E-06 -3.40E-07 5.78E-09 S11 -4.84E+00 0.00E+00 1.67E-03 -5.18E-05 7.47E-06 -3.44E-07 5.46E-09

[0178] from Figure 14 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has qualified imaging quality and qualified detail resolution in both low and high frequency conditions.

[0179] Example 8

[0180] Please see Figure 15 The figure shown is a schematic diagram of the optical lens provided in Embodiment 8 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0181] The relevant parameters of each lens in the optical lens of Example 8 are shown in Table 8-1.

[0182] Table 8-1

[0183]

[0184] The surface profile parameters of the aspherical lens in Example 8 are shown in Table 8-2.

[0185] Table 8-2

[0186]

[0187]

[0188] from Figure 16It can be seen from the MTF curves in the full field of view that the MTF values of the optical lens provided in the embodiment are all above 0.3, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and the imaging quality and the detail resolution capability are good in the low frequency and high frequency cases.

[0189] Embodiment 9

[0190] Please refer to Figure 17 , which is a structural schematic diagram of the optical lens provided in the embodiment 9 of the present application, and compared with the embodiment 1, the main difference of the embodiment 9 is that the optical parameters such as the radius of curvature of the lens surface and the lens thickness are different.

[0191] The related parameters of the lenses in the optical lens in the embodiment 9 are shown in Table 9-1.

[0192] Table 9-1

[0193]

[0194] The surface type parameters of the aspheric lenses of the optical lens in the embodiment 9 are shown in Table 9-2.

[0195] Table 9-2

[0196] Face number K A B C D E F S3 -4.55E+00 0.00E+00 0.00E+00 -5.68E-06 2.70E-07 -7.37E-09 7.13E-11 S4 1.97E+01 0.00E+00 0.00E+00 -1.19E-06 4.08E-08 -8.22E-10 5.81E-12 S10 -9.02E-01 0.00E+00 -1.85E-03 3.53E-05 -7.26E-06 3.68E-07 -5.50E-09 S11 -6.85E-01 0.00E+00 -1.72E-03 3.07E-05 -6.49E-06 3.94E-07 -6.45E-09

[0197] From Figure 18 It can be seen from the MTF curves in the full field of view that the MTF values of the optical lens provided in the embodiment are all above 0.3, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and the imaging quality and the detail resolution capability are good in the low frequency and high frequency cases.

[0198] Embodiment 10

[0199] Please refer to Figure 19 , which is a structural schematic diagram of the optical lens provided in the embodiment 10 of the present application, and compared with the embodiment 1, the main difference of the embodiment 10 is that the optical parameters such as the radius of curvature of the lens surface and the lens thickness are different.

[0200] The related parameters of the lenses in the optical lens in the embodiment 10 are shown in Table 10-1.

[0201] Table 10-1

[0202]

[0203] The surface type parameters of the aspheric lenses of the optical lens in the embodiment 10 are shown in Table 10-2.

[0204] Table 10-2

[0205] Face number K A B C D E F S3 -1.63E+00 0.00E+00 0.00E+00 -2.23E-06 8.41E-08 -2.30E-09 1.97E-11 S4 4.99E+01 0.00E+00 0.00E+00 6.03E-07 -4.10E-08 8.59E-10 -7.08E-12 S10 -1.97E+01 0.00E+00 -8.75E-04 -2.21E-05 -7.69E-07 3.51E-08 1.39E-10 S11 -1.26E+01 0.00E+00 -2.30E-04 -3.39E-05 3.64E-07 2.27E-08 -1.79E-10

[0206] As can be seen from Figure 20 , the MTF value of the embodiment is above 0.2 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution ability in low frequency and high frequency cases.

[0207] Embodiment 11

[0208] Please refer to Figure 21 , which is a structural schematic diagram of the optical lens provided in the embodiment 11 of the present application, and compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0209] The related parameters of each lens in the optical lens in the embodiment 11 are shown in Table 11-1.

[0210] Table 11-1

[0211]

[0212] The surface type parameters of the aspheric lens of the optical lens in the embodiment 11 are shown in Table 11-2.

[0213] Table 11-2

[0214] Face number K A B C D E F S3 -1.15E+01 0.00E+00 0.00E+00 -1.79E-06 -2.92E-08 -1.46E-09 5.05E-11 S4 -5.00E+01 0.00E+00 0.00E+00 -1.00E-06 6.14E-08 -1.13E-09 1.34E-11 S10 -6.37E-03 0.00E+00 2.04E-05 6.81E-05 -8.66E-07 -5.81E-08 1.50E-09 S11 -2.20E+00 0.00E+00 3.91E-04 4.58E-05 1.24E-06 -1.13E-07 2.10E-09

[0215] As can be seen from Figure 22 , the MTF value of the embodiment is above 0.2 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution ability in low frequency and high frequency cases.

[0216] Embodiment 12

[0217] Please refer to Figure 23 , which is a structural schematic diagram of the optical lens provided in the embodiment 12 of the present application, and compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0218] The related parameters of each lens in the optical lens in the embodiment 12 are shown in Table 12-1.

[0219] Table 12-1

[0220]

[0221] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 12 are shown in Table 12-2.

[0222] Table 12-2

[0223] Face number K A B C D E F S3 -2.64E+00 0.00E+00 0.00E+00 -6.25E-06 -1.52E-07 2.23E-09 -2.43E-11 S4 -1.43E+00 0.00E+00 0.00E+00 -8.02E-06 2.07E-08 -2.18E-10 2.99E-11 S10 -9.32E-01 0.00E+00 -3.86E-03 6.75E-06 2.84E-06 -1.42E-08 -9.61E-10 S11 -1.70E+00 0.00E+00 -3.13E-03 3.62E-05 3.61E-06 -9.02E-08 7.58E-10

[0224] As can be seen from Figure 24 , the MTF values of the present embodiment are all above 0.4 in the full field of view, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and have good imaging quality and good detail resolution ability in both low and high frequency cases.

[0225] Embodiment 13

[0226] Referring to Figure 25 , a structural schematic diagram of the optical lens provided in Embodiment 13 of the present application is shown, and the present embodiment mainly differs from Embodiment 1 in that the optical parameters such as the radii of curvature of the surfaces of the lenses and the thicknesses of the lenses are different.

[0227] The related parameters of the lenses in the optical lens in Embodiment 13 are shown in Table 13-1.

[0228] Table 13-1

[0229]

[0230]

[0231] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 13 are shown in Table 13-2.

[0232] Table 13-2

[0233] Face number K A B C D E F S3 -1.92E+00 0.00E+00 0.00E+00 -7.91E-06 -3.05E-07 2.28E-09 -2.69E-11 S4 -5.71E-01 0.00E+00 0.00E+00 -1.14E-05 -9.69E-08 -1.42E-09 1.29E-10 S10 -1.71E+00 0.00E+00 3.36E-03 -2.24E-05 -3.88E-06 1.19E-07 -9.45E-10 S11 -2.86E+00 0.00E+00 3.99E-03 2.94E-06 -1.79E-06 1.45E-08 6.06E-10

[0234] As can be seen from Figure 26 , the MTF values of the present embodiment are all above 0.3 in the full field of view, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and have better imaging quality and better detail resolution ability in both low and high frequency cases.

[0235] Embodiment 14

[0236] Referring to Figure 27 , a structural schematic diagram of the optical lens provided in Embodiment 14 of the present application is shown, and the present embodiment mainly differs from Embodiment 1 in that the aspherical lens is arranged, and the optical parameters such as the radii of curvature of the surfaces of the lenses and the thicknesses of the lenses are different.

[0237] The related parameters of the lenses in the optical lens in Embodiment 14 are shown in Table 14-1.

[0238] Table 14-1

[0239]

[0240]

[0241] The surface type parameters of the aspheric lenses of the optical lens in Embodiment 14 are shown in Table 14-2.

[0242] Table 14-2

[0243] Face number K A B C D E F S3 -1.54E+01 0.00E+00 0.00E+00 -4.22E-06 1.24E-07 -1.12E-09 -1.35E-11 S4 -3.64E+01 0.00E+00 0.00E+00 5.47E-07 1.51E-08 1.41E-09 -1.73E-11 S10 9.28E+00 0.00E+00 -2.01E-03 1.09E-04 -4.15E-07 -8.36E-08 1.97E-09 S11 7.29E+01 0.00E+00 -1.96E-03 1.03E-04 -6.81E-07 -5.59E-08 1.26E-09

[0244] As can be seen from Figure 28 , the MTF values of this embodiment are all above 0.2 in the full field of view, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and in the low and high frequency cases, both have qualified imaging quality and qualified detail resolution capability.

[0245] Embodiment 15

[0246] Please refer to Figure 29 , which is a structural schematic diagram of the optical lens provided in Embodiment 15 of the application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radii of curvature of the lens surfaces and the lens thicknesses are different.

[0247] The related parameters of the lenses in the optical lens in Embodiment 15 are shown in Table 15-1.

[0248] Table 15-1

[0249]

[0250]

[0251] The surface type parameters of the aspheric lenses of the optical lens in Embodiment 15 are shown in Table 15-2.

[0252] Table 15-2

[0253] Face number K A B C D E F S3 -4.76E+00 0.00E+00 0.00E+00 -5.02E-06 8.57E-08 -1.77E-09 -1.11E-11 S4 5.00E+01 0.00E+00 0.00E+00 -9.94E-07 -3.22E-08 4.89E-10 -3.21E-12 S10 7.85E+00 0.00E+00 -1.39E-03 9.71E-07 -1.58E-06 8.04E-09 1.00E-09 S11 2.49E+00 0.00E+00 -1.18E-03 -1.18E-06 -1.00E-06 2.14E-08 3.49E-10

[0254] As can be seen from Figure 30 , the MTF values of this embodiment are all above 0.2 in the full field of view, and in the range of 0-120 lp / mm, the MTF curves uniformly and smoothly decrease from the center to the edge of the field of view, and in the low and high frequency cases, both have qualified imaging quality and qualified detail resolution capability.

[0255] Example 16

[0256] Please see Figure 31 The figure shown is a schematic diagram of the optical lens provided in Embodiment 16 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0257] The relevant parameters of each lens in the optical lens of Example 16 are shown in Table 16-1.

[0258] Table 16-1

[0259]

[0260]

[0261] The surface profile parameters of the aspherical lens in the optical lens of Example 16 are shown in Table 16-2.

[0262] Table 16-2

[0263] Face number K A B C D E F S3 -4.71E+00 0.00E+00 0.00E+00 -5.54E-06 6.30E-08 -2.00E-09 -1.97E-12 S4 4.65E+01 0.00E+00 0.00E+00 -1.80E-06 -5.16E-08 8.27E-10 -4.62E-12 S10 6.13E+00 0.00E+00 -1.84E-03 -2.50E-05 3.29E-06 8.24E-08 -4.11E-09 S11 5.06E+01 0.00E+00 -1.26E-03 -6.83E-06 3.53E-06 -3.61E-08 1.14E-10

[0264] from Figure 32 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0265] Example 17

[0266] Please see Figure 33 The figure shown is a schematic diagram of the optical lens provided in Embodiment 17 of the present invention. Compared with Embodiment 1, the main difference in this embodiment is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0267] The relevant parameters of each lens in the optical lens of Example 17 are shown in Table 17-1.

[0268] Table 17-1

[0269]

[0270] The surface profile parameters of the aspherical lens in the optical lens of Example 17 are shown in Table 17-2.

[0271] Table 17-2

[0272]

[0273]

[0274] It can be seen from Figure 34 The MTF value of the embodiment is above 0.2 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution capability in the case of low frequency and high frequency.

[0275] Embodiment 18

[0276] Please refer to Figure 35 , which is a structural schematic diagram of an optical lens provided in Embodiment 18 of the application. Compared with Embodiment 1, the main difference between the two embodiments is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0277] The related parameters of each lens in the optical lens in Embodiment 18 are shown in Table 18-1.

[0278] Table 18-1

[0279]

[0280] The surface type parameters of the aspherical lens of the optical lens in Embodiment 18 are shown in Table 18-2.

[0281] Table 18-2

[0282] Face number K A B C D E F S3 -4.76E-01 0.00E+00 0.00E+00 9.22E-07 -3.94E-08 7.36E-10 -4.80E-12 S4 4.78E-01 0.00E+00 0.00E+00 1.46E-06 -6.82E-08 1.42E-09 -1.04E-11 S10 6.79E+00 0.00E+00 -3.27E-03 1.44E-04 -4.31E-06 1.10E-07 -1.75E-09 S11 -6.18E+00 0.00E+00 -2.86E-03 1.51E-04 -5.01E-06 1.36E-07 -2.04E-09

[0283] It can be seen from Figure 36 The MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0-120 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 capability in the case of low frequency and high frequency.

[0284] Please refer to Table 19 for the optical properties corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH, and the maximum field of view angle FOV of the optical lens, and the numerical values corresponding to each conditional expression in each embodiment.

[0285] Table 19

[0286]

[0287] Table 19 (continued)

[0288]

[0289]

[0290] Table 19 (continued)

[0291]

[0292]

[0293] In summary of the above embodiments, the optical lens provided by the present application improves the imaging quality of the optical lens, reduces aberration, and improves the imaging quality of the optical lens by optimizing the shape, optical power, thickness, and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization, long focal length, and the like.

[0294] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0295] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, 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; a second lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a third lens with positive refractive power, the image side surface of which is convex; a fourth lens with positive refractive power, the object side surface of which is convex; a fifth lens with negative refractive power, the image side surface of which is concave; a sixth lens with negative refractive power; The effective focal length f of the optical lens and the total track length TTL satisfy: 1.6 < TTL / f < 2.

5. The object side surface curvature radius R3 and the image side surface curvature radius R4 of the second lens satisfy: -0.96 < (R3-R4) / (R3+R4) < -0.

01. The real image height IH corresponding to the maximum field angle of the optical lens, the total track length TTL and the maximum field angle FOV satisfy: 53.0 < 180°×TTL / (IH / 2) / (FOV / 2) < 80.

0.

2. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the total track length TTL satisfy: 1.76 ≤ TTL / f ≤ 2.

40.

3. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.55 < IH / f < 0.

7.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2 < BFL / f < 0.

45.

5. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle of the optical lens, the total track length TTL and the maximum field angle FOV satisfy: 55.16 ≤ 180°×TTL / (IH / 2) / (FOV / 2) ≤ 78.

66.

6. The optical lens of claim 1, wherein, The sum of the central thicknesses of the first lens to the sixth lens ∑CT and the total track length TTL of the optical lens satisfy: 0.5 < ∑CT / TTL < 0.

85.

7. The optical lens of claim 1, wherein, The maximum field angle FOV of the optical lens, the real image height IH corresponding to the maximum field angle and the object side surface clear aperture D1 of the first lens satisfy: 3.0 < D1 / IH / tan(FOV / 2) < 4.

5.

8. The optical lens of claim 1, wherein, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -5.36 ≤ f1 / f < -1.

3.

9. The optical lens of claim 1, wherein, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.2 < f2 / f ≤ 6.

72.

10. The optical lens of claim 1, wherein, The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -6.69 ≤ f6 / f < -1.

2.

11. The optical lens of claim 1, wherein, The object side surface curvature radius R3 and the image side surface curvature radius R4 of the second lens satisfy: -0.94 ≤ (R3-R4) / (R3+R4) ≤ -0.02.

Images