Optical lens

Abstract

The application provides an optical lens, which comprises six lenses in sequence along an optical axis from an object side to an imaging surface, and the six lenses comprise: a first lens with negative optical power, wherein the object side surface and the image side surface of the first lens are both concave; a second lens with positive optical power, wherein the image side surface of the second lens is convex; a third lens with positive optical power; a fourth lens with negative optical power, wherein the object side surface of the fourth lens is concave; a fifth lens with positive optical power, wherein the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; and a sixth lens with negative optical power, wherein the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex. The optical lens provided by the application has one or more advantages of low cost, high resolution, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

Description

TECHNICAL FIELD

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

[0002] In modern automotive technology, vehicle-mounted cameras play a crucial role. They include various types such as interior, rear, front, side and surround view cameras, each with its unique application scenarios. For example, rear view cameras are mainly used for reversing images, while surround view cameras provide a 360-degree panoramic view, greatly enhancing the driver's perception.

[0003] In vehicle-mounted cameras, front view cameras are the core components of ADAS (Advanced Driver Assistance System), which are usually installed on the front windshield and are mainly responsible for functions such as forward collision warning, lane departure warning and pedestrian detection. Currently, front view cameras are usually much more expensive than other types of cameras due to the involvement of complex algorithms and chip processing, which also reflects the important position of front view cameras in vehicle-mounted camera systems. With the rapid development of advanced driver assistance systems, the requirements for front view lenses are becoming higher and higher. Therefore, it is necessary to develop an optical lens with good imaging effect. SUMMARY

[0004] To solve the above problems, the purpose of the present application is to provide an optical lens with the advantages of excellent imaging quality.

[0005] 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, both the object side and the image side are concave;

[0008] The second lens with positive focal power, the image side is convex;

[0009] The third lens with positive focal power;

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

[0011] The fifth lens with positive focal power, the object side is convex, and the image side is concave;

[0012] The sixth lens with negative focal power, the object side is concave, and the image side is convex;

[0013] Wherein, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -1<(R9-R10) / (R9+R10)<0.

[0014] Further preferably, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f <-1.

[0015] Further preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.9 < f4 / f < -0.4.

[0016] Further preferably, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5 < f5 / f < 3.0.

[0017] Further preferably, the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: -5 < f3456 / f < 4.

[0018] Further preferably, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: -9.5 < R1 / f < -2.1; the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.9 < R2 / f < 13.4.

[0019] Further preferably, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 0 < R9 / R10 < 0.3.

[0020] Further preferably, the radius of curvature R9 of the object side surface of the fifth lens and the focal length f5 of the fifth lens satisfy: 0.2 < R9 / f5 < 1.1; the radius of curvature R10 of the image side surface of the fifth lens and the focal length f5 of the fifth lens satisfy: 2.2 < R10 / f5 < 24.2.

[0021] Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the radian θ of the maximum half field angle of the optical lens satisfy: 0.90 < (IH / 2) / (f x θ) < 1.00.

[0022] Further preferably, the half entrance pupil radius d9 of the object side surface of the fifth lens and the half entrance pupil sag Sag9 of the object side surface of the fifth lens satisfy: 0.1 < Sag9 / d9 < 0.8; the half entrance pupil radius d10 of the image side surface of the fifth lens and the half entrance pupil sag Sag10 of the image side surface of the fifth lens satisfy: 0 < Sag10 / d10 < 0.1.

[0023] The optical lens provided by the application adopts six lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of low cost, high resolution, high imaging quality and the like. 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 It is a structural schematic diagram of the optical lens in embodiment 1 of the application.

[0026] Figure 2 It is a field curvature curve diagram of the optical lens in embodiment 1 of the application.

[0027] Figure 3 It is an F-θ distortion curve diagram of the optical lens in embodiment 1 of the application.

[0028] Figure 4 It is an axial aberration curve diagram of the optical lens in embodiment 1 of the application.

[0029] Figure 5 It is a lateral chromatic aberration curve diagram of the optical lens in embodiment 1 of the application.

[0030] Figure 6 It is an MTF curve diagram of the optical lens in embodiment 1 of the application.

[0031] Figure 7 It is a structural schematic diagram of the optical lens in embodiment 2 of the application.

[0032] Figure 8 It is a field curvature curve diagram of the optical lens in embodiment 2 of the application.

[0033] Figure 9 It is an F-θ distortion curve diagram of the optical lens in embodiment 2 of the application.

[0034] Figure 10 It is an axial aberration curve diagram of the optical lens in embodiment 2 of the application.

[0035] Figure 11 It is a lateral chromatic aberration curve diagram of the optical lens in embodiment 2 of the application.

[0036] Figure 12 It is an MTF curve diagram of the optical lens in embodiment 2 of the application.

[0037] Figure 13 It is a structural schematic diagram of the optical lens in embodiment 3 of the application.

[0038] Figure 14 Field curvature curve diagram of the optical lens in embodiment 3 of the present application.

[0039] Figure 15 F-θ distortion curve diagram of the optical lens in embodiment 3 of the present application.

[0040] Figure 16 Axial aberration curve diagram of the optical lens in embodiment 3 of the present application.

[0041] Figure 17 Vignetting curve diagram of the optical lens in embodiment 3 of the present application.

[0042] Figure 18 MTF curve diagram of the optical lens in embodiment 3 of the present application.

[0043] Figure 19 Structure schematic diagram of the optical lens in embodiment 4 of the present application.

[0044] Figure 20 Field curvature curve diagram of the optical lens in embodiment 4 of the present application.

[0045] Figure 21 F-θ distortion curve diagram of the optical lens in embodiment 4 of the present application.

[0046] Figure 22 Axial aberration curve diagram of the optical lens in embodiment 4 of the present application.

[0047] Figure 23 Vignetting curve diagram of the optical lens in embodiment 4 of the present application.

[0048] Figure 24 MTF curve diagram of the optical lens in embodiment 4 of the present application.

[0049] Figure 25 Structure schematic diagram of the optical lens in embodiment 5 of the present application.

[0050] Figure 26 Field curvature curve diagram of the optical lens in embodiment 5 of the present application.

[0051] Figure 27 F-θ distortion curve diagram of the optical lens in embodiment 5 of the present application.

[0052] Figure 28 Axial aberration curve diagram of the optical lens in embodiment 5 of the present application.

[0053] Figure 29 Vignetting curve diagram of the optical lens in embodiment 5 of the present application.

[0054] Figure 30 MTF curve diagram of the optical lens in embodiment 5 of the present application.

[0055] Figure 31 Structure diagram of the optical lens in Embodiment 6 of the present application.

[0056] Figure 32 Field curvature curve diagram of the optical lens in Embodiment 6 of the present application.

[0057] Figure 33 F-θ distortion curve diagram of the optical lens in Embodiment 6 of the present application.

[0058] Figure 34 Axial aberration curve diagram of the optical lens in Embodiment 6 of the present application.

[0059] Figure 35 Vignetting curve diagram of the optical lens in Embodiment 6 of the present application.

[0060] Figure 36 MTF curve diagram of the optical lens in Embodiment 6 of the present application.

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

[0062] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0063] 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 on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

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

[0065] In the present disclosure, near optical axis 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 at the near optical axis. 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 at the near optical axis. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0066] It should also be understood that the use of the terms "including", "including", "having", "containing", and / or "containing", when used in this specification, means that the presence of the stated features, elements and / or components, but does not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of" appear after a list of listed features, they modify the entire list of features, not individual elements of the list. In addition, when describing embodiments of the present application, "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

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

[0068] 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.

[0069] The optical lens provided by the embodiments of the present application is composed of six lenses, which are sequentially arranged along the optical axis from the object side to the image plane as the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens.

[0070] In some embodiments, the first lens can have a negative focal power, and both the object side surface and the image side surface thereof are concave. The second lens can have a positive focal power, and the object side surface thereof is convex or concave, and the image side surface thereof is convex. The third lens can have a positive focal power, and the object side surface thereof is convex or concave, and the image side surface thereof is convex or concave. The fourth lens can have a negative focal power, and the object side surface thereof is concave, and the image side surface thereof is convex or concave. The fifth lens can have a positive focal power, and the object side surface thereof is convex, and the image side surface thereof is concave. The sixth lens can have a negative focal power, and the object side surface thereof is concave, and the image side surface thereof is convex.

[0071] In some embodiments, the second lens has positive refractive power, and its object-side surface is concave; the third lens has positive refractive power, and both its object-side surface and image-side surface are convex; and the fourth lens has negative refractive power, and its image-side surface is concave.

[0072] In some embodiments, the second lens has positive refractive power, and its object-side surface is convex; the third lens has positive refractive power, and both its object-side surface and image-side surface are convex; and the fourth lens has negative refractive power, and its image-side surface is concave.

[0073] In some embodiments, the second lens has positive refractive power, and its object-side surface is convex; the third lens has positive refractive power, and its object-side surface is convex and its image-side surface is concave; and the fourth lens has negative refractive power, and its image-side surface is concave.

[0074] In some embodiments, the second lens has positive refractive power, and its object-side surface is convex; the third lens has positive refractive power, and its object-side surface is concave and its image-side surface is convex; and the fourth lens has negative refractive power, and its image-side surface is concave.

[0075] In some embodiments, the second lens has positive refractive power, and its object-side surface is concave; the third lens has positive refractive power, and both its object-side surface and image-side surface are convex; and the fourth lens has negative refractive power, and its image-side surface is convex.

[0076] In some embodiments, the second lens has positive refractive power, and its object-side surface is convex; the third lens has positive refractive power, and both its object-side surface and image-side surface are convex; and the fourth lens has negative refractive power, and its image-side surface is concave.

[0077] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the second lens and the third lens. It can be understood that the diaphragm can be used to limit the amount of light, so as to change the brightness of the imaging. In addition, when the diaphragm is located between the second lens and the third lens, the diaphragm can reasonably distribute the functions of the first lens to the sixth lens, for example, the first lens and the second lens can be used to receive light to a greater extent, and the third lens to the sixth lens can be used to correct aberrations, which is conducive to balancing the structure of the entire optical system. In addition, when the diaphragm is located between the second lens and the third lens, the diaphragm aberration can be corrected.

[0078] In some embodiments, the optical lens can further comprise a filter and a protective glass, which can be sequentially arranged along the optical axis between the sixth lens and the imaging surface. The filter is used to filter out interference light, so as to prevent the interference light from reaching the imaging surface of the optical lens and affecting the normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged, and can improve the impact resistance and scratch resistance of the optical lens, while having little effect on the imaging quality of the optical lens.

[0079] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1 < (R9-R10) / (R9+R10) < 0. Satisfying the above range, reasonably limiting the shape of the object side surface and the image side surface of the fifth lens, the direction of light can be further controlled, the back focal length can be reduced, the imaging quality can be improved, and the light utilization rate can be increased. Preferably, -1 < (R9-R10) / (R9+R10) < -0.7.

[0080] 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. Satisfying the above range, the sixth lens has a suitable negative refractive power, which can increase the imaging area and improve the imaging quality. Preferably, -29.0 < f6 / f < -1.7.

[0081] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.9 < f4 / f < -0.4. Satisfying the above range, the fourth lens has a suitable negative refractive power, which can optimize the lens chromatic aberration and improve the imaging quality. Preferably, -1.7 < f4 / f < -0.5.

[0082] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5 < f5 / f < 3.0. Satisfying the above range, the fifth lens has a suitable positive refractive power, which can optimize the spherical aberration and achieve high-quality imaging. Preferably, 0.6 < f5 / f < 2.9.

[0083] In some embodiments, the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: -5 < f3456 / f < 4. Satisfying the above range, the refractive power of the front and rear lens groups of the optical lens is within a suitable range, which can converge light, reduce the difficulty of aberration correction of the lens, and improve the imaging quality of the optical lens. Preferably, -3.5 < f3456 / f < 2.0.

[0084] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: -9.5 < R1 / f < -2.1; the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.9 < R2 / f < 13.4. Satisfying the above range, the shape of the object side surface and the image side surface of the first lens is reasonably limited, which can reduce the adverse effects of astigmatism and field curvature on the imaging of the optical lens, and improve the imaging quality. Preferably, -9.0 < R1 / f < -2.4; 1.1 < R2 / f < 12.3.

[0085] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 0 < R9 / R10 < 0.3. By satisfying the above range, the shape of the object side surface and the image side surface of the fifth lens is reasonably limited, which can further reduce the coma and improve the imaging quality. Preferably, 0.02 < R9 / R10 < 0.17.

[0086] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the focal length f5 of the fifth lens satisfy: 0.2 < R9 / f5 < 1.1; and the radius of curvature R10 of the image side surface of the fifth lens and the focal length f5 of the fifth lens satisfy: 2.2 < R10 / f5 < 24.2. By satisfying the above range, the shape of the object side surface and the image side surface of the fifth lens is reasonably limited, which can further reduce the field curvature and improve the imaging quality. Preferably, 0.4 < R9 / f5 < 1.9; and 2.7 < R10 / f5 < 23.0.

[0087] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian θ of the maximum half field angle of the optical lens satisfy: 0.90 < (IH / 2) / (f x θ) < 1.00. By satisfying the above range, the balance between the large image surface and the high-quality imaging of the optical lens is achieved, so that the lens has a larger imaging area and higher resolution capability. Preferably, 0.91 < (IH / 2) / (f x θ) < 0.98.

[0088] In some embodiments, the half-pupil-diameter d9 of the object side surface of the fifth lens and the half-pupil-diameter sag9 of the object side surface of the fifth lens satisfy: 0.1 < sag9 / d9 < 0.8; and the half-pupil-diameter d10 of the image side surface of the fifth lens and the half-pupil-diameter sag10 of the image side surface of the fifth lens satisfy: 0 < sag10 / d10 < 0.1. By satisfying the above range, the half-pupil-diameter and the corresponding half-pupil-diameter sag of the object side surface and the image side surface of the fifth lens are reasonably limited, which can effectively control the light ray trend of the edge field of view and improve the imaging quality of the edge field of view. Preferably, 0.19 < sag9 / d9 < 0.67; and 0.01 < sag10 / d10 < 0.06.

[0089] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 3.1 < TTL / IH < 4.3. By satisfying the above range, the balance between the small volume and the large image surface of the optical lens is achieved, so that the lens has a smaller total length and higher resolution capability. Preferably, 3.4 < TTL / IH < 4.0.

[0090] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO of the optical lens satisfy: 35° < FOV / FNO < 42°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the implementation of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of the edge field of view, thereby also conducive to obtaining more scene information. Preferably, 37.3° < FOV / FNO < 39.5°.

[0091] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO of the optical lens satisfy: 35° < FOV / FNO < 42°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the implementation of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of the edge field of view, thereby also conducive to obtaining more scene information. Preferably, 37.3° < FOV / FNO < 39.5°.

[0092] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO of the optical lens satisfy: 35° < FOV / FNO < 42°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large range detection, and the implementation of large aperture characteristics is conducive to improving the problem of rapid decline of relative brightness of the edge field of view, thereby also conducive to obtaining more scene information. Preferably, 37.3° < FOV / FNO < 39.5°.

[0093] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -6.1 < f1 / f < -1.0. Satisfying the above range makes the first lens have a suitable negative refractive power, realizes large-angle light collection; at the same time, it is conducive to reducing the inclination angle of the incident light and reducing the generation of high-order aberrations. Preferably, -5.7 < f1 / f < -1.1.

[0094] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.1 < f2 / f < 10.5. Satisfying the above range makes the second lens have a suitable positive refractive power, can converge light, and make the light trend stable. Preferably, 1.2 < f2 / f < 9.4.

[0095] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f3 / f < 2.3. Satisfying the above range makes the third lens have a suitable positive refractive power, can balance the lens aberration, and improve the imaging quality. Preferably, 0.9 < f3 / f < 2.1.

[0096] In some embodiments, the fourth lens and the fifth lens form a cemented lens group, and the image-side surface of the fourth lens and the object-side surface of the fifth lens are cemented surfaces. In some embodiments, the third lens and the fourth lens form a cemented lens group, and the image-side surface of the third lens and the object-side surface of the fourth lens are cemented surfaces. The ranges above can effectively correct chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to decentration, balance aberration of the optical lens, and improve the imaging quality of the optical lens. The ranges above 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.

[0097] In some embodiments, the fourth lens and the fifth lens form a cemented lens group with negative refractive power, and the image-side surface of the fourth lens and the object-side surface of the fifth lens are cemented surfaces. The combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: -18 < f45 / f < -2. Preferably, -16.6 < f45 / f < -3.1.

[0098] In some embodiments, the third lens and the fourth lens form a cemented lens group with positive refractive power, and the image-side surface of the third lens and the object-side surface of the fourth lens are cemented surfaces. The combined focal length f34 of the third lens and the fourth lens and the effective focal length f of the optical lens satisfy: 1.4 < f34 / f < 1.8. Preferably, 1.6 < f34 / f < 1.7.

[0099] In some embodiments, the radius of curvature R9 of the object-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.3 < R9 / f < 1.5; and the radius of curvature R10 of the image-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 3.2 < R10 / f < 15.9. The ranges above reasonably limit the shape of the object-side surface and the image-side surface of the fifth lens, which can effectively reduce coma and field curvature and improve the imaging quality. Preferably, 0.4 < R9 / f < 1.3; and 3.8 < R10 / f < 15.0.

[0100] In some embodiments, the radius of curvature R11 of the object-side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -6.3 < R11 / f < -0.1; and the radius of curvature R12 of the image-side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -10.5 < R12 / f < -0.2. The ranges above reasonably limit the shape of the object-side surface and the image-side surface of the sixth lens, which can reduce astigmatism and achieve high-quality imaging. Preferably, -5.9 < R11 / f < -0.2; and -9.7 < R12 / f < -0.3.

[0101] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the focal length f1 of the first lens satisfy: 0.5 < R1 / f1 < 2.6; the radius of curvature R2 of the image side surface of the first lens and the focal length f1 of the first lens satisfy: -3.6 < R2 / f1 < -0.5. Satisfying the above ranges helps to achieve high-quality imaging. Preferably, 0.7 < R1 / f1 < 2.4; -3.4 < R2 / f1 < -0.5.

[0102] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the focal length f6 of the sixth lens satisfy: 0 < R11 / f6 < 0.9; the radius of curvature R12 of the image side surface of the sixth lens and the focal length f6 of the sixth lens satisfy: 0 < R12 / f6 < 4.8. Satisfying the above ranges helps to achieve high-quality imaging. Preferably, 0 < R11 / f6 < 0.7; 0 < R12 / f6 < 4.4.

[0103] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -1 < (R11-R12) / (R11+R12) < 0. Satisfying the above ranges reasonably limits the shape of the object side surface and the image side surface of the sixth lens, which can further reduce the spherical aberration and the field curvature, achieving high-quality imaging. Preferably, -0.8 < (R11-R12) / (R11+R12) < -0.1.

[0104] In some embodiments, the half radius of the clear aperture d1 of the object side surface of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.8 < d1 / (IH / 2) / tan(FOV / 2) < 1.4. Satisfying the above ranges reasonably limits the front aperture, the real image height, and the maximum field angle of the optical lens, which can reasonably arrange the overall geometry of the optical lens and improve its structural stability. Preferably, 0.9 < d1 / (IH / 2) / tan(FOV / 2) < 1.2.

[0105] In some embodiments, the total track length TTL of the optical lens and the sum ∑CT of the center thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy: 1.7 < TTL / ∑CT < 2.8. Satisfying the above ranges can achieve high-pixel characteristics and improve the imaging quality of the optical lens. Preferably, 1.7 < TTL / ∑CT < 2.4.

[0106] In some embodiments, the center thickness CT5 of the fifth lens and the center thickness CT4 of the fourth lens satisfy: 2.6 < CT5 / CT4 < 8.3. Satisfying the above ranges reasonably configures the center thicknesses of the fourth lens and the fifth lens, which is conducive to meeting the processability and workability requirements of the lens. Preferably, 2.9 < CT5 / CT4 < 7.8.

[0107] In some embodiments, the optical lens satisfies the following conditional expressions: 5.1mm < f < 6.3mm; 65° < FOV < 75°; 2.8mm < EPD < 3.5mm; 22mm < TTL < 27mm; 1.6 < FNO < 2.1; 5.9mm < IH < 7.4mm; 10° < CRA < 37°; BFL > 1.8mm. In the above conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, FNO represents the aperture value of the optical lens, IH represents the real image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray angle of incidence at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. Preferably, 5.6mm < f < 5.9mm; 68° < FOV < 72°; 3.0mm < EPD < 3.3mm; 23.6mm < TTL < 26.0mm; 1.7 < FNO < 2.0; 6.5mm < IH < 6.8mm; 12.9° < CRA < 34.7°; 1.9mm < BFL < 3.6mm. Satisfying the above ranges, the optical lens has at least one or more advantages of large target surface, low cost, high resolution, etc.

[0108] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an 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 achieving miniaturization of the lens. More specifically, the first lens, the third lens, the fourth lens and the fifth lens of the present application adopt a spherical lens, and the second lens and the sixth lens adopt an aspherical lens.

[0109] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0110]

[0111] 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 of 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 B, C, D, E and F are respectively the fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order surface coefficients.

[0112] 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, and any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement modes, and are included in the protection scope of the application.

[0113] Embodiment 1

[0114] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application, the optical lens 100 includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1 and a protective glass G2.

[0115] The first lens L1 has a negative focal power, and the object side surface S1 and the image side surface S2 are both concave surfaces;

[0116] The second lens L2 has a positive focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;

[0117] The third lens L3 has a positive focal power, and the object side surface S5 and the image side surface S6 are both convex surfaces;

[0118] The fourth lens L4 has a negative focal power, and the object side surface S7 and the image side surface S8 are both concave surfaces;

[0119] The fifth lens L5 has a positive focal power, the object side surface S8 is a convex surface, and the image side surface S9 is a concave surface;

[0120] The fourth lens L4 and the fifth lens L5 form a cemented lens group with a negative focal power, that is, the cemented surface of the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;

[0121] The sixth lens L6 has a negative focal power, the object side surface S10 is a concave surface, and the image side surface S11 is a convex surface;

[0122] The object side surface S12 and the image side surface S13 of the filter G1 are both flat surfaces;

[0123] The object side surface S14 and the image side surface S15 of the protective glass G2 are both flat surfaces;

[0124] The imaging surface S16 is a flat surface.

[0125] The first lens L1, the third lens L3, the fourth lens L4 and the fifth lens L5 are glass spherical lenses, and the second lens L2 and the sixth lens L6 are glass aspherical lenses.

[0126] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0127] Table 1-1

[0128]

[0129] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0130] Table 1-2

[0131] Surface number K B C D E F S3 -5.00E+01 -1.01E-03 -2.19E-05 1.93E-06 -1.43E-07 4.40E-09 S4 -1.53E+00 -6.47E-04 -3.95E-06 3.76E-07 -2.33E-08 5.08E-10 S10 5.00E+01 -9.01E-03 -1.29E-03 3.38E-04 -5.03E-05 3.07E-06 S11 1.74E+01 -6.12E-03 -7.65E-04 2.25E-04 -2.47E-05 1.16E-06

[0132] In this embodiment, the field curvature curve, the F- theta distortion curve, the axial aberration curve, the lateral aberration curve and the MTF (Modulation Transfer Function) curve of the optical lens 100 are shown in FIGS. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 respectively.

[0133] 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: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.03mm-0.06mm, which shows that the optical lens can well correct the field curvature.

[0134] Figure 3 The F- theta distortion curve of Embodiment 1 is shown, which represents the F- theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F- theta distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F- theta distortion of the optical lens is controlled within -8%-0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0135] Figure 4 The axial aberration curve of Embodiment 1 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: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -0.01mm-0.04mm, which shows that the optical lens can well correct the axial aberration.

[0136] Figure 5 A curve diagram of the sagittal chromatic aberration of Example 1 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 diagram, the sagittal chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -3 μm ~ 3 μm, which indicates that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0137] Figure 6 A curve diagram of the MTF (modulation transfer function) of Example 1 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 diagram, the MTF value of the present embodiment is above 0.35 within the entire field of view, and within the range of 0 ~ 160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, having good imaging quality and good detail resolution capability.

[0138] Example 2

[0139] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens 200 provided in Example 2 of the present application. Compared with Example 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different; and the object side S3 of the second lens L2 is a convex surface.

[0140] The related parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0141] Table 2-1

[0142]

[0143]

[0144] The surface type parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0145] Table 2-2

[0146] Surface number K B C D E F S3 -2.77E+01 -7.88E-04 -4.04E-06 7.78E-09 5.37E-09 3.26E-10 S4 6.38E-01 -3.78E-04 5.34E-06 8.87E-10 -1.06E-09 1.83E-10 S10 -1.25E+00 -1.29E-02 1.42E-04 -8.52E-05 9.36E-06 4.36E-07 S11 -4.99E+01 -8.33E-03 3.77E-04 -8.33E-06 4.25E-07 4.78E-08

[0147] In the present embodiment, the field curvature curve diagram, the F-θ distortion curve diagram, the axial aberration curve diagram, the sagittal chromatic aberration curve diagram, and the MTF (modulation transfer function) curve diagram of the optical lens 200 are shown in Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 , respectively. As can be seen from Figure 8It can be seen from the table that the field curvature of the meridional image plane and the sagittal image plane is controlled within-0.02mm~0.04mm, which indicates that the optical lens can correct the field curvature well. Figure 9 It can be seen from the table that the F-θ distortion of the optical lens is controlled within-4%~0, the image compression in the edge angle region is relatively flat, and the definition of the expanded image is effectively improved. Figure 10 It can be seen from the table that the shift amount of the axial aberration of the embodiment is controlled within-0.01mm~0.02mm, which indicates that the optical lens can correct the axial aberration well. Figure 11 It can be seen from the table that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within-1μm~3μm, which indicates that the optical lens can correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane very well. Figure 12 It can be seen from the table that the MTF value of the embodiment is above 0.5 in the full field of view, and in the range of 0~160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, which indicates that the optical lens has good imaging quality and good detail resolution capability.

[0148] Embodiment 3

[0149] Please refer to Figure 13 , which is a structural schematic diagram of the optical lens 300 provided in the embodiment 3 of the present application. 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; and the object side S3 of the second lens L2 is a convex surface; and the image side S6 of the third lens L3 is a concave surface.

[0150] The related parameters of each lens in the optical lens 300 in the embodiment 3 are shown in Table 3-1.

[0151] Table 3-1

[0152]

[0153] The surface type parameters of the aspherical lens of the optical lens 300 in the embodiment 3 are shown in Table 3-2.

[0154] Table 3-2

[0155] Surface number K B C D E F S3 2.96E+01 -4.26E-04 -5.10E-06 5.24E-07 -2.77E-08 4.59E-10 S4 -1.33E+00 -2.79E-04 -5.20E-06 7.00E-07 -3.96E-08 9.56E-10 S10 -3.20E+01 -6.28E-03 -3.28E-04 1.67E-05 -8.09E-06 5.49E-07 S11 -4.52E+01 -4.66E-03 -1.22E-04 1.57E-05 -6.81E-07 1.76E-08

[0156] In the embodiment, the field curvature curve, the F-θ distortion curve, the axial aberration curve, the transverse chromatic aberration curve and the MTF (modulation transfer function) curve of the optical lens 300 are respectively shown in Figure 14 , Figure 15 , Figure 16 , Figure 17 and Figure 18 . From Figure 14It can be seen from the table that the field curvature of the meridional image plane and the sagittal image plane is controlled within-0.01mm~0.08mm, which indicates that the optical lens can correct the field curvature well. Figure 15 It can be seen from the table that the F-θ distortion of the optical lens is controlled within-4%~0, the image compression in the edge angle region is relatively flat, and the definition of the expanded image is effectively improved. Figure 16 It can be seen from the table that the shift amount of the axial aberration of the optical lens is controlled within-0.01mm~0.02mm, which indicates that the optical lens can correct the axial aberration well. Figure 17 It can be seen from the table that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within-1μm~4μm, which indicates that the optical lens can correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane very well. Figure 18 It can be seen from the table that the MTF value of the optical lens is above 0.4 in the full field of view, and in the range of 0~160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, which indicates that the optical lens has good imaging quality and good detail resolution capability.

[0157] Embodiment 4

[0158] Please refer to Figure 19 , which is a structural schematic diagram of the optical lens 400 provided in Embodiment 4 of the present application. Compared with 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; and the object side S3 of the second lens L2 is a convex surface; and the object side S5 of the third lens L3 is a concave surface.

[0159] The related parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0160] Table 4-1

[0161]

[0162]

[0163] The surface type parameters of the aspherical lens of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0164] Table 4-2

[0165] Surface number K B C D E F S3 2.50E-01 -1.32E-03 -5.78E-05 1.41E-06 -3.69E-07 1.95E-08 S4 -3.93E+00 -5.84E-04 -4.33E-05 3.52E-06 -1.20E-07 1.01E-08 S10 1.66E-01 -1.79E-02 8.40E-05 5.44E-04 -1.09E-04 7.73E-06 S11 -4.08E+01 -1.41E-02 8.41E-04 2.13E-04 -3.99E-05 2.34E-06

[0166] In this embodiment, the field curvature curve, the F-θ distortion curve, the axial aberration curve, the transverse chromatic aberration curve and the MTF (modulation transfer function) curve of the optical lens 400 are respectively as shown in Figure 20 、 Figure 21 、 Figure 22 、 Figure 23and Figure 24 As shown. From Figure 20 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.03mm to 0.02mm, indicating that the optical lens can effectively correct field curvature. From Figure 21 As can be seen, the F-θ distortion of the optical lens is controlled within -8% to 0, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image. From Figure 22 As can be seen, the axial aberration offset in this embodiment is controlled within -0.01mm to 0.02mm, indicating that the optical lens can effectively correct axial aberration. From Figure 23 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -3μm to 3.5μm, indicating that this optical lens can excellently correct chromatic aberration at the edges of the field of view and the second-order spectrum of the entire image plane. From Figure 24 As can be seen, the MTF value of this embodiment is above 0.35 throughout the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating that the optical lens has good imaging quality and good detail resolution.

[0167] Example 5

[0168] Please see Figure 25 The diagram shows a schematic of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the image-side surface S7 of the fourth lens L4 is a convex surface; the third lens L3 and the fourth lens L4 form a cemented lens group with positive optical power, and the image-side surface S6 of the third lens L3 and the object-side surface S6 of the fourth lens L4 are cemented surfaces.

[0169] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0170] Table 5-1

[0171]

[0172]

[0173] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0174] Table 5-2

[0175] Surface number K B C D E F S3 -3.30E-01 -5.22E-04 2.25E-05 -9.11E-07 5.05E-08 -8.32E-10 S4 -1.49E+00 -3.94E-04 1.18E-05 -5.75E-07 2.23E-08 -2.98E-10 S10 -1.05E+00 9.63E-03 7.92E-03 -2.05E-03 2.05E-04 -7.89E-06 S11 -2.63E+00 -2.00E-02 1.07E-02 -1.76E-03 1.36E-04 -4.17E-06

[0176] In the embodiment, the field curvature curve, the F-theta distortion curve, the axial aberration curve, the transverse chromatic aberration curve and the MTF (Modulation Transfer Function) curve of the optical lens 500 are shown in FIGS. 1-5, respectively. Figure 26 、 Figure 27 、 Figure 28 、 Figure 29 and Figure 30 It can be seen from Figure 26 that the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.05mm-0.04mm, which indicates that the optical lens can well correct the field curvature. It can be seen from Figure 27 that the F-theta distortion of the optical lens is controlled within -8%-0, and the image compression in the edge angle region is relatively gentle, which effectively improves the definition of the expanded image. It can be seen from Figure 28 that the offset of the axial aberration in the embodiment is controlled within -0.02mm-0.03mm, which indicates that the optical lens can well correct the axial aberration. It can be seen from Figure 29 that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -3.5um-3um, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface. It can be seen from Figure 30 that the MTF value of the embodiment is above 0.25 in the full field of view, and in the range of 0-160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, which indicates that the optical lens has good imaging quality and good detail resolution capability.

[0177] Embodiment 6

[0178] Please refer to Figure 31 , which is a structural schematic diagram of the optical lens 600 provided in the embodiment 6 of the present application. Compared with the embodiment 1, the main difference lies in that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the object side S3 of the second lens L2 is a convex surface.

[0179] The related parameters of each lens in the optical lens 600 in the embodiment 6 are shown in Table 6-1.

[0180] Table 6-1

[0181]

[0182] The surface type parameters of the aspherical lens of the optical lens 600 in the embodiment 6 are shown in Table 6-2.

[0183] Table 6-2

[0184]

[0185]

[0186] In this embodiment, the field curvature curve, F-θ distortion curve, axial aberration curve, transverse chromatic aberration curve, and MTF (modulation transfer function) curve of the optical lens 600 are respectively as follows: Figure 32 , Figure 33 , Figure 34 , Figure 35 and Figure 36 As shown. From Figure 32 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.04mm to 0.06mm, indicating that the optical lens can effectively correct field curvature. From Figure 33 As can be seen, the F-θ distortion of the optical lens is controlled within -5% to 0, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image. From Figure 34 As can be seen, the axial aberration offset in this embodiment is controlled within -0.02mm to 0.03mm, indicating that the optical lens can effectively correct axial aberration. From Figure 35 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -2μm to 3μm, indicating that the optical lens can excellently correct chromatic aberration at the edges of the field of view and the second-order spectrum of the entire image plane. From Figure 36 As can be seen, the MTF value of this embodiment is above 0.35 throughout the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating that the optical lens has good imaging quality and good detail resolution.

[0187] Please refer to Table 7 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0188] Table 7

[0189]

[0190]

[0191] In summary, the optical lens provided by the present invention uses six lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as low cost, high resolution, and high imaging quality.

[0192] 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.

[0193] 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 skilled 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 surface along the optical axis, sequentially comprise: a first lens with negative refractive power, both the object side surface and the image side surface of which are concave; a second lens with positive refractive power, the image side surface of which is convex; a third lens with positive refractive power; a fourth lens with negative refractive power, the object side surface of which is concave; a fifth lens with positive refractive power, the object side surface of which is convex and the image side surface of which is concave; a sixth lens with negative refractive power, the object side surface of which is concave and the image side surface of which is convex; wherein the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1<(R9-R10) / (R9+R10)<0; the half entrance pupil diameter d9 of the object side surface of the fifth lens and the sag Sag9 of the half entrance pupil diameter of the object side surface of the fifth lens satisfy: 0.1<Sag9 / d9<0.8; and the half entrance pupil diameter d10 of the image side surface of the fifth lens and the sag Sag10 of the half entrance pupil diameter of the image side surface of the fifth lens satisfy: 0<Sag10 / d10<0.

1.

2. 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: -29.0<f6 / f<-1.

7.

3. The optical lens of claim 1, wherein, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.9<f4 / f<-0.

4.

4. The optical lens of claim 1, wherein, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.5<f5 / f<3.

0.

5. The optical lens of claim 1, wherein, the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: -5<f3456 / f<4.

6. The optical lens of claim 1, wherein, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: -9.5<R1 / f<-2.1; and the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.9<R2 / f<13.

4.

7. The optical lens of claim 1, wherein, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 0<R9 / R10<0.

3.

8. The optical lens of claim 1, wherein, the radius of curvature R9 of the object side surface of the fifth lens and the focal length f5 of the fifth lens satisfy: 0.2<R9 / f5<1.1; and the radius of curvature R10 of the image side surface of the fifth lens and the focal length f5 of the fifth lens satisfy: 2.2<R10 / f5<24.

2.

9. The optical lens of claim 1, wherein, the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the radian θ of the maximum half field angle of the optical lens satisfy: 0.90<(IH / 2) / (f×θ)<1.

00.

10. The optical lens of claim 1, wherein, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -1<(R9-R10) / (R9+R10)<-0.7; the half entrance pupil diameter d9 of the object side surface of the fifth lens and the sag Sag9 of the half entrance pupil diameter of the object side surface of the fifth lens satisfy: 0.19<Sag9 / d9<0.67; and the half entrance pupil diameter d10 of the image side surface of the fifth lens and the sag Sag10 of the half entrance pupil diameter of the image side surface of the fifth lens satisfy: 0.01<Sag10 / d10<0.06.

Images