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 comprises the following: a first lens with positive refractive power; a second lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is convex; 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; and a sixth lens with positive refractive power; at least one of the first lens, the third lens and the sixth lens is a meniscus lens. The optical lens provided by the application adopts six lenses with specific refractive power, and through specific surface shape matching and reasonable refractive power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as a large target surface, a large aperture, high imaging quality and the like.

Description

TECHNICAL FIELD

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

[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are increasingly used in intelligent driving, and vehicle optical lenses are continuously improving in the automotive industry.

[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving, which collects environmental information through various lenses combined with sensors to ensure the safety of drivers. In addition to the requirements of optical lenses for the existing ADAS system, such as light and thin shape, high pixel, high resolution and other characteristics, the optical lens is also required to clearly image under low illumination conditions, so it is necessary to develop an optical lens with good imaging effect. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with 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] a first lens with positive focal power;

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

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

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

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

[0012] a sixth lens with positive focal power;

[0013] At least one of the first lens, the third lens and the sixth lens is a concave-convex surface type.

[0014] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < TTL / f < 2.5.

[0015] It is further preferred that the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 0.95 < (IH / 2) / (f*tan(FOV / 2)) < 1.05.

[0016] It is further preferred that the real image height IH corresponding to the maximum field of view FOV of the optical lens and the effective focal length f of the optical lens satisfy: 0.6 < IH / f < 0.7.

[0017] It is further preferred that the total optical length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 70 < 180°*TTL / (IH / 2) / (FOV / 2) < 73.

[0018] It is further preferred that the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: |(R1+R2) / (R1-R2)| > 1.8.

[0019] It is further preferred that the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: (R3+R4) / (R3-R4) < -1.2.

[0020] It is further preferred that the object side surface curvature radius R11 of the sixth lens and the image side surface curvature radius R12 of the sixth lens satisfy: |(R11+R12) / (R11-R12)| > 1.8.

[0021] It is further preferred that the image side surface curvature radius R6 of the third lens and the object side surface curvature radius R7 of the fourth lens satisfy: |(R6-R7) / (R6+R7)| > 3.

[0022] It is further preferred that the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: f1 / f > 3.

[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 can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of large target surface, large aperture, 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 more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0025] Figure 1Structure diagram of the optical lens in Embodiment 1 of the present application.

[0026] Figure 2 Field curvature curve diagram of the optical lens in Embodiment 1 of the present application.

[0027] Figure 3 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 1 of the present application.

[0028] Figure 4 MTF curve diagram of the optical lens in Embodiment 1 of the present application.

[0029] Figure 5 Structure diagram of the optical lens in Embodiment 2 of the present application.

[0030] Figure 6 Field curvature curve diagram of the optical lens in Embodiment 2 of the present application.

[0031] Figure 7 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 2 of the present application.

[0032] Figure 8 MTF curve diagram of the optical lens in Embodiment 2 of the present application.

[0033] Figure 9 Structure diagram of the optical lens in Embodiment 3 of the present application.

[0034] Figure 10 Field curvature curve diagram of the optical lens in Embodiment 3 of the present application.

[0035] Figure 11 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 3 of the present application.

[0036] Figure 12 MTF curve diagram of the optical lens in Embodiment 3 of the present application.

[0037] Figure 13 Structure diagram of the optical lens in Embodiment 4 of the present application.

[0038] Figure 14 Field curvature curve diagram of the optical lens in Embodiment 4 of the present application.

[0039] Figure 15 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 4 of the present application.

[0040] Figure 16 MTF curve diagram of the optical lens in Embodiment 4 of the present application.

[0041] Figure 17Structure diagram of the optical lens in Embodiment 5 of the present application.

[0042] Figure 18 Field curvature curve diagram of the optical lens in Embodiment 5 of the present application.

[0043] Figure 19 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 5 of the present application.

[0044] Figure 20 MTF curve diagram of the optical lens in Embodiment 5 of the present application.

[0045] Figure 21 Structure diagram of the optical lens in Embodiment 6 of the present application.

[0046] Figure 22 Field curvature curve diagram of the optical lens in Embodiment 6 of the present application.

[0047] Figure 23 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 6 of the present application.

[0048] Figure 24 MTF curve diagram of the optical lens in Embodiment 6 of the present application.

[0049] Figure 25 Structure diagram of the optical lens in Embodiment 7 of the present application.

[0050] Figure 26 Field curvature curve diagram of the optical lens in Embodiment 7 of the present application.

[0051] Figure 27 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 7 of the present application.

[0052] Figure 28 MTF curve diagram of the optical lens in Embodiment 7 of the present application.

[0053] Figure 29 Structure diagram of the optical lens in Embodiment 8 of the present application.

[0054] Figure 30 Field curvature curve diagram of the optical lens in Embodiment 8 of the present application.

[0055] Figure 31 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 8 of the present application.

[0056] Figure 32 MTF curve diagram of the optical lens in Embodiment 8 of the present application.

[0057] Figure 33Structure diagram of the optical lens in Embodiment 9 of the present application.

[0058] Figure 34 Field curvature curve diagram of the optical lens in Embodiment 9 of the present application.

[0059] Figure 35 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 9 of the present application.

[0060] Figure 36 MTF curve diagram of the optical lens in Embodiment 9 of the present application.

[0061] Figure 37 Structure diagram of the optical lens in Embodiment 10 of the present application.

[0062] Figure 38 Field curvature curve diagram of the optical lens in Embodiment 10 of the present application.

[0063] Figure 39 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 10 of the present application.

[0064] Figure 40 MTF curve diagram of the optical lens in Embodiment 10 of the present application.

[0065] Figure 41 Structure diagram of the optical lens in Embodiment 11 of the present application.

[0066] Figure 42 Field curvature curve diagram of the optical lens in Embodiment 11 of the present application.

[0067] Figure 43 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 11 of the present application.

[0068] Figure 44 MTF curve diagram of the optical lens in Embodiment 11 of the present application.

[0069] Figure 45 Structure diagram of the optical lens in Embodiment 12 of the present application.

[0070] Figure 46 Field curvature curve diagram of the optical lens in Embodiment 12 of the present application.

[0071] Figure 47 F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 12 of the present application.

[0072] Figure 48 MTF curve diagram of the optical lens in Embodiment 12 of the present application.

[0073] Figure 49 A structure diagram of an optical lens according to an embodiment 13 of the present application.

[0074] Figure 50 A field curvature curve of an optical lens according to an embodiment 13 of the present application.

[0075] Figure 51 An F-Tan(Theta) distortion curve of an optical lens according to an embodiment 13 of the present application.

[0076] Figure 52 An MTF curve of an optical lens according to an embodiment 13 of the present application.

[0077] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION

[0078] 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 noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0079] It is to be noted that, in the present specification, the expressions first, second, third and the like 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.

[0080] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical 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.

[0081] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0082] 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, it modifies the entire list of features, not the individual elements in 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.

[0083] 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 the terms (such as those defined in a commonly used dictionary) 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 defined herein.

[0084] 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 combination with the embodiments.

[0085] 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.

[0086] In some embodiments, the first lens can have a positive focal power, the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex. The second lens can have a negative focal power, the object side surface thereof is concave, and the image side surface thereof is convex. The third lens can have a positive focal power, the object side surface thereof can be concave or convex, and the image side surface thereof is convex. The fourth lens can have a positive focal power, the object side surface thereof is convex, and the image side surface thereof can be concave or convex. The fifth lens can have a negative focal power, the object side surface thereof can be concave or convex, and the image side surface thereof is concave. The sixth lens can have a positive focal power, the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex. Among them, at least one lens of the first lens, the third lens and the sixth lens is a concave-convex surface type.

[0087] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the first lens and the second lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the image. When the diaphragm is located between the first lens and the second lens, the correction of the diaphragm aberration is facilitated.

[0088] In some embodiments, the optical lens can further include a filter, which can be disposed between the sixth lens and the imaging surface. The filter is used to filter out interference light, preventing the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0089] In some embodiments, the fourth lens and the fifth lens can be cemented to form a cemented lens, which can effectively correct chromatic aberration of the optical lens, reduce sensitivity of the optical lens to decentration, balance aberration of the optical lens, and improve imaging quality of the optical lens; and can also reduce assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0090] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < TTL / f < 2.5. Satisfying the above range is beneficial to limit the total length of the lens and achieve miniaturization.

[0091] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.95 < (IH / 2) / (f x tan(FOV / 2)) < 1.05. Satisfying the above range can control the optical lens to have small distortion and improve the imaging quality of the optical lens.

[0092] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 0.6 < IH / f < 0.7. Satisfying the above range controls the image height and focal length of the optical lens to be within a reasonable range, which helps the optical lens to have a large image surface and improve the imaging quality.

[0093] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.2 < BFL / f < 0.45. Satisfying the above range limits the optical lens to have a suitable back focus, facilitates reasonable arrangement of the positions of the lenses, and reduces the difficulty of processing and assembly.

[0094] In some embodiments, the total optical length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 70 < 180° x TTL / (IH / 2) / (FOV / 2) < 73. Satisfying the above range limits the length of the optical lens under the same imaging area and the same field of view, and achieves miniaturization of the optical lens.

[0095] The total optical length TTL of the optical lens and the sum of the central thicknesses of the first lens to the sixth lens along the optical axis respectively satisfy: 0.55 <∑CT / TTL<0.85. Satisfying the above range, reasonably configuring the total optical length of the optical lens and the sum of the thicknesses of the lenses, can help to realize high-pixel characteristics and improve the imaging quality of the optical lens.

[0096] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: f1 / f>3. Satisfying the above range, the light rays are converged, and the front aperture can be reduced.

[0097] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: f2 / f<-0.9. Satisfying the above range, the light rays are diverged, the central light rays and the edge light rays of each field of view are dispersed, the rear optical system has a larger light receiving surface to receive the light rays emitted from the image side of the second lens, the light receiving amount is increased, and the relative illumination is increased.

[0098] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.9<f3 / f<1.3. Satisfying the above range, the third lens has appropriate positive focal power, converges the light rays, and cooperates with the negative focal power of the second lens to further converge the light rays passing through the second lens, reduce the height of the peripheral light rays, and reduce the aperture of the rear lens.

[0099] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.8<f4 / f<1.4. Satisfying the above range, the fourth lens has appropriate positive focal power, which is beneficial to light convergence. The fourth lens with positive focal power and the fifth lens with negative focal power cooperate to adjust the optical path difference between different fields of view, improve resolution, make the light rays enter the rear lens gently, and further reduce field curvature and correct the off-axis point aberration of the optical lens.

[0100] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: f5 / f<-0.4. Satisfying the above range, the fifth lens has negative focal power, which can diverge the light rays emitted from the fourth lens, make the light rays of the edge field of view have an upward trend, and make the image points on the imaging surface away from the optical axis, which is beneficial to realize the effect of matching a large chip, obtain a larger picture, and effectively eliminate aberration and improve the resolution of the optical lens.

[0101] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: f6 / f>1.5. Satisfying the above range, the sixth lens is defined to have positive refractive power, which is beneficial to converging light rays, smoothly transitioning the light rays to the rear, reducing the height of the light rays incident to the rear, slowing down the upward trend of the light rays, avoiding the loss of light energy caused by the excessively large angle between the main light ray and the chip when the light rays of the large field of view reach the imaging surface, improving the illumination of the edge field of view, and being beneficial to realizing a short total optical length.

[0102] In some embodiments, the effective focal length f of the optical lens and the image-side surface curvature radius R10 of the fifth lens satisfy: 0.5

[0103] In some embodiments, the image-side surface curvature radius R6 of the third lens and the object-side surface curvature radius R7 of the fourth lens satisfy: |(R6-R7) / (R6+R7)|>3. Satisfying the above range, the image-side surface of the third lens and the object-side surface of the fourth lens are approximately symmetrically structured, which can converge light rays, reduce the aperture of the rear lens, and smoothly transfer the light rays collected by the front lens to the rear lens.

[0104] In some embodiments, the object-side surface curvature radius R1 of the first lens and the image-side surface curvature radius R2 of the first lens satisfy: |(R1+R2) / (R1-R2)|>1.8. Satisfying the above range, the object-side surface and the image-side surface can be close to concentric circular structure, which reduces the ability of the first lens to converge light rays and plays a role in smoothly transitioning light rays.

[0105] In some embodiments, the object-side surface curvature radius R3 of the second lens and the image-side surface curvature radius R4 of the second lens satisfy: (R3+R4) / (R3-R4)<-1.2. Satisfying the above range, the light rays passing through the first lens can be smoothly collected under a small aperture; at the same time, the second lens is set as a meniscus lens bending toward the object side, which can smoothly converge the light rays passing through the first lens to the rear lens, reduce the aperture of the front end of the lens, reduce the volume, be beneficial to the miniaturization of the optical lens, and reduce the cost.

[0106] In some embodiments, the object-side surface curvature radius R11 of the sixth lens and the image-side surface curvature radius R12 of the sixth lens satisfy: |(R11+R12) / (R11-R12)|>1.8. Satisfying the above range, the object-side surface and the image-side surface can be close to concentric circular structure, which reduces the ability of the sixth lens to converge light rays and plays a role in smoothly transitioning light rays.

[0107] In some embodiments, the optical lens satisfies the following conditional expressions: 14mm < f < 16mm; 30° < FOV < 40°; 9mm < EPD < 10mm; 34mm < TTL < 36mm; 1.5 < Fno < 1.8; 9mm < IH < 10mm; 11° < CRA < 19°; 3mm < BFL < 6.5mm. 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 incident angle at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. By satisfying the above ranges, the optical lens has one or more advantages such as large target surface, large aperture, long focal length, and the like.

[0108] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present application can adopt a full-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0109] 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 lens miniaturization. More specifically, the first lens, the second lens, the fourth lens, and the fifth lens of the present application adopt a spherical lens, and the third lens and the sixth lens adopt an aspherical lens.

[0110] 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:

[0111] ;

[0112] 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 B, C, D, E, and F are the fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0113] 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.

[0114] Embodiment 1

[0115] 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.

[0116] The first lens L1 has positive focal power, the object side S1 thereof is a concave surface, and the image side S2 thereof is a convex surface.

[0117] The second lens L2 has negative focal power, the object side S3 thereof is a concave surface, and the image side S4 thereof is a convex surface.

[0118] The third lens L3 has positive focal power, and both the object side S5 and the image side S6 thereof are convex surfaces.

[0119] The fourth lens L4 has positive focal power, and both the object side S7 and the image side S8 thereof are convex surfaces.

[0120] The fifth lens L5 has negative focal power, and both the object side S8 and the image side S9 thereof are concave surfaces.

[0121] The fourth lens L4 and the fifth lens L5 form a cemented lens group, that is, the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8.

[0122] The sixth lens L6 has positive focal power, the object side S10 thereof is a concave surface, and the image side S11 thereof is a convex surface.

[0123] The object side S12 and the image side S13 of the filter G1 are both flat surfaces.

[0124] The imaging surface S14 is a flat surface.

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

[0126] The related parameters of each lens in the optical lens in embodiment 1 are shown in Table 1-1.

[0127] Table 1-1

[0128]

[0129] The surface parameters of the aspherical lens of the optical lens in Example 1 are shown in Table 1-2.

[0130] Table 1-2

[0131]

[0132] In this embodiment, the field curvature curve, F-Tan(Theta) distortion curve and MTF curve of the optical lens are shown in Figure 2 、 Figure 3 、 Figure 4 respectively.

[0133] Figure 2 The field curvature curve of Example 1 is shown, which represents the curvature degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which shows that the optical lens can well correct the field curvature.

[0134] Figure 3 The F-Tan(Theta) distortion curve of Example 1 is shown, which represents the distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the distortion of the optical lens is controlled within ±2%, which shows that the optical lens can well correct the distortion.

[0135] Figure 4 The MTF (Modulation Transfer Function) curve 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. It can be seen from the figure that the MTF value of this embodiment is above 0.28 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.

[0136] Example 2

[0137] Please refer to Figure 5As shown in FIG. 2, which is a structural schematic diagram of the optical lens provided in Embodiment 2 of the present application, the main difference between this embodiment and Embodiment 1 is that: the object side S10 of the sixth lens L6 is a convex surface; the image side S11 of the sixth lens L6 is a concave surface; the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0138] The related parameters of each lens in the optical lens in Embodiment 2 are shown in Table 2-1.

[0139] Table 2-1

[0140]

[0141] The surface type parameters of the aspherical lens of the optical lens in Embodiment 2 are shown in Table 2-2.

[0142] Table 2-2

[0143]

[0144] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown in FIGs. 2a, 2b and 2c respectively. Figure 6 , Figure 7 , Figure 8 As can be seen from FIGs. 2a, 2b and 2c, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which indicates that the optical lens can well correct the field curvature; the distortion of the optical lens is controlled within ±1%, which indicates that the optical lens can well correct the distortion; and the MTF value of this embodiment is above 0.3 in the full field of view, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view in the range of 0-120 lp / mm, and the imaging quality and the detail resolution ability are good in the low frequency and high frequency cases. Figure 6 Figure 7 Figure 8

[0145] Embodiment 3

[0146] As shown in FIG. 3, which is a structural schematic diagram of the optical lens provided in Embodiment 3 of the present application, the main difference between this embodiment and Embodiment 1 is that: the object side S5 of the third lens L3 is a concave surface; the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different. Figure 9 The related parameters of each lens in the optical lens in Embodiment 3 are shown in Table 3-1.

[0147] Table 3-1

[0148]

[0149]

[0150] ​​​​The surface shape parameters of the aspherical lenses of the optical lens in Embodiment 3 are shown in Table 3-2.

[0151] Table 3-2

[0152]

[0153] In the present embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown in Figure 10 , Figure 11 , Figure 12 respectively. As can be seen from Figure 10 , the field curvature of the sagittal image surface and the tangential image surface is controlled within ±0.06 mm, which indicates that the optical lens can well correct the field curvature. As can be seen from Figure 11 , the distortion of the optical lens is controlled within ±2%, which indicates that the optical lens can well correct the distortion. As can be seen from Figure 12 , the MTF value of the present 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 the optical lens has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0154] Embodiment 4

[0155] Please refer to Figure 13 , 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 is that the fourth lens L4 and the fifth lens L5 are not cemented lens groups; the image side surface S8 of the fourth lens L4 is a concave surface; the object side surface S9 of the fifth lens L5 is a convex surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0156] The related parameters of each lens in the optical lens in Embodiment 4 are shown in Table 4-1.

[0157] Table 4-1

[0158]

[0159] The surface shape parameters of the aspherical lenses of the optical lens in Embodiment 4 are shown in Table 4-2.

[0160] Table 4-2

[0161]

[0162] In the present embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown in Figure 14 , Figure 15 , Figure 16 respectively. As can be seen fromFigure 14 It can be seen from the field curvature curves of the meridional image surface and the sagittal image surface in FIG. 13 that the field curvature of the optical lens is controlled within ±0.06 mm, which indicates that the optical lens can correct the field curvature well. Figure 15 It can be seen from the distortion curves of the optical lens in FIG. 14 that the distortion of the optical lens is controlled within ±2%, which indicates that the optical lens can correct the distortion well. Figure 16 It can be seen from the MTF curves of the optical lens in FIG. 15 that the MTF value of the optical lens in this embodiment is above 0.2 in the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view in the range of 0-120 lp / mm, which indicates that the optical lens has good imaging quality and good detail resolution ability in the low-frequency and high-frequency cases.

[0163] Embodiment 5

[0164] Referring to FIG. 16, which is a structural schematic diagram of an optical lens provided in Embodiment 5 of the present application, the main difference between this embodiment and Embodiment 1 is that the fourth lens L4 and the fifth lens L5 are not cemented lens groups; the image side S8 of the fourth lens L4 is a concave surface; the object side S9 of the fifth lens L5 is a convex surface; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different. Figure 17 Embodiment 5

[0165] Table 5-1

[0166]

[0167] The surface type parameters of the aspherical lens of the optical lens in Embodiment 5 are shown in Table 5-2.

[0168] Table 5-2

[0169]

[0170] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown in FIG. 17, FIG. 18 and FIG. 19, respectively.

[0171] Figure 18 Figure 19 Figure 20 Figure 18 It can be seen from the field curvature curves of the meridional image surface and the sagittal image surface in FIG. 18 that the field curvature of the optical lens is controlled within ±0.1 mm, which indicates that the optical lens can correct the field curvature well. Figure 19 It can be seen from the distortion curves of the optical lens in FIG. 19 that the distortion of the optical lens is controlled within ±2%, which indicates that the optical lens can correct the distortion well. Figure 20 ​​​​It can be seen from the above that the MTF value of the optical lens in 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 the optical lens has good imaging quality and good detail resolution capability in the low frequency and high frequency cases.

[0172] Embodiment 6

[0173] Please refer to Figure 21 , which is a structural schematic diagram of the optical lens provided in Embodiment 6 of the present application. Compared with Embodiment 1, the main difference is that the fourth lens L4 and the fifth lens L5 are not cemented lens groups; the image side S8 of the fourth lens L4 is a concave surface; the object side S9 of the fifth lens L5 is a convex surface; the object side S11 of the sixth lens L6 is a convex surface; the image side S12 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0174] The related parameters of each lens in the optical lens in Embodiment 6 are shown in Table 6-1.

[0175] Table 6-1

[0176]

[0177] The surface type parameters of the aspherical lens of the optical lens in Embodiment 6 are shown in Table 6-2.

[0178] Table 6-2

[0179]

[0180] In the embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown in Figure 22 , Figure 23 , Figure 24 respectively. It can be seen from Figure 22 that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1 mm, which indicates that the optical lens can well correct the field curvature. It can be seen from Figure 23 that the distortion of the optical lens is controlled within ±2%, which indicates that the optical lens can well correct the distortion. It can be seen from Figure 24 that the MTF value of the optical lens in 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 the optical lens has good imaging quality and good detail resolution capability in the low frequency and high frequency cases.

[0181] Embodiment 7

[0182] Please refer to Figure 25, which is a structural schematic view of the optical lens provided in Embodiment 7 of the present application. Compared with Embodiment 1, the main difference is that the fourth lens L4 and the fifth lens L5 are not cemented lens groups; the image side surface S8 of the fourth lens L4 is a concave surface; the object side surface S9 of the fifth lens L5 is a convex surface; the object side surface S11 of the sixth lens L6 is a convex surface; the image side surface S12 of the sixth lens L6 is a concave surface; and the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0183] The related parameters of each lens in the optical lens in Embodiment 7 are shown in Table 7-1.

[0184] Table 7-1

[0185]

[0186] The surface type parameters of the aspheric lens of the optical lens in Embodiment 7 are shown in Table 7-2.

[0187] Table 7-2

[0188]

[0189] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown in Figure 26 , Figure 27 , Figure 28 respectively. As can be seen from Figure 26 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1 mm, which indicates that the optical lens can well correct the field curvature. As can be seen from Figure 27 , the distortion of the optical lens is controlled within ±4%, which indicates that the optical lens can well correct the distortion. As can be seen from Figure 28 , the MTF value of this embodiment is above 0.25 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.

[0190] Embodiment 8

[0191] Please refer to Figure 29 , which is a structural schematic view of the optical lens provided in Embodiment 8 of the present application. Compared with Embodiment 1, the main difference is that the object side surface S10 of the sixth lens L6 is a convex surface; the image side surface S11 of the sixth lens L6 is a concave surface; and the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0192] The related parameters of each lens in the optical lens in Embodiment 8 are shown in Table 8-1.

[0193] Table 8-1

[0194]

[0195] The surface profile parameters of the aspherical lenses of the optical lens in Embodiment 8 are shown in Table 8-2.

[0196] Table 8-2

[0197]

[0198] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown in Figure 30 , Figure 31 , Figure 32 respectively. As can be seen from Figure 30 , the field curvature of the sagittal image surface and the tangential image surface is controlled within ±0.1 mm, which indicates that the optical lens can well correct the field curvature. As can be seen from Figure 31 , the distortion of the optical lens is controlled within ±3%, which indicates that the optical lens can well correct the distortion. As can be seen from Figure 32 , the MTF value of this 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 ability in the case of low frequency and high frequency.

[0199] Embodiment 9

[0200] Please refer to Figure 33 , which is a structural schematic diagram of the optical lens provided in Embodiment 9 of the present application. Compared with Embodiment 1, the main difference is that: the object side S1 of the first lens L1 is a convex surface; the image side S2 of the first lens L1 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0201] The related parameters of each lens in the optical lens in Embodiment 9 are shown in Table 9-1.

[0202] Table 9-1

[0203]

[0204] The surface profile parameters of the aspherical lenses of the optical lens in Embodiment 9 are shown in Table 9-2.

[0205] Table 9-2

[0206]

[0207] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown inFigure 34 , Figure 35 , Figure 36 It can be seen from Figure 34 that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.06 mm, which indicates that the optical lens can well correct the field curvature. It can be seen from Figure 35 that the distortion of the optical lens is controlled within ±1%, which indicates that the optical lens can well correct the distortion. It can be seen from Figure 36 that 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 ability in the case of low frequency and high frequency.

[0208] Embodiment 10

[0209] Please refer to Figure 37 , which is a structural schematic diagram of the optical lens provided in the embodiment 10 of the present application. Compared with the embodiment 1, the main difference is that: the object side S1 of the first lens L1 is a convex surface; the image side S2 of the first lens L1 is a concave surface; the object side S5 of the third lens L3 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0210] The related parameters of each lens in the optical lens in the embodiment 10 are shown in Table 10-1.

[0211] Table 10-1

[0212]

[0213] The surface type parameters of the aspherical lens of the optical lens in the embodiment 10 are shown in Table 10-2.

[0214] Table 10-2

[0215]

[0216] In the embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are respectively shown in Figure 38 , Figure 39 , Figure 40 It can be seen from Figure 38 that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.05 mm, which indicates that the optical lens can well correct the field curvature. It can be seen from Figure 39 that the distortion of the optical lens is controlled within ±2%, which indicates that the optical lens can well correct the distortion. It can be seen from Figure 40It can be seen from the F-Tan(Theta) distortion curve diagram in FIG. 11B that the distortion of the optical lens is controlled within ±3%, which indicates that the optical lens can correct the distortion well.

[0217] Embodiment 11

[0218] Please refer to FIG. 11A, Figure 41 which is a structural schematic diagram of an optical lens provided in Embodiment 11 of the present application. Compared with Embodiment 1, the main difference of this embodiment is that the fourth lens L4 and the fifth lens L5 are not cemented lens groups; the object side S1 of the first lens L1 is a convex surface; the image side S2 of the first lens L1 is a concave surface; the image side S8 of the fourth lens L4 is a concave surface; the object side S9 of the fifth lens L5 is a convex surface; and the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0219] The related parameters of each lens in the optical lens in Embodiment 11 are shown in Table 11-1.

[0220] Table 11-1

[0221]

[0222] The surface type parameters of the aspherical lens of the optical lens in Embodiment 11 are shown in Table 11-2.

[0223] Table 11-2

[0224]

[0225] In this embodiment, the field curvature curve diagram, the F-Tan(Theta) distortion curve diagram and the MTF curve diagram of the optical lens are shown in FIG. 11A, Figure 42 , Figure 43 , Figure 44 respectively. It can be seen from Figure 42 that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which indicates that the optical lens can correct the field curvature well. It can be seen from Figure 43 that the distortion of the optical lens is controlled within ±3%, which indicates that the optical lens can correct the distortion well. It can be seen from Figure 44 that the MTF value of this embodiment is above 0.25 within the full field of view, and the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view within the range of 0-120 lp / mm, which has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0226] Embodiment 12

[0227] Please refer to FIG. 12A, Figure 45As shown in FIG. 12, it is a structural schematic diagram of the optical lens provided in the embodiment 12 of the present application. Compared with the embodiment 1, the main difference lies in that the fourth lens L4 and the fifth lens L5 are not cemented lens groups; the object side S1 of the first lens L1 is a convex surface; the image side S2 of the first lens L1 is a concave surface; the image side S8 of the fourth lens L4 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0228] The related parameters of each lens in the optical lens in the embodiment 12 are shown in Table 12-1.

[0229] Table 12-1

[0230]

[0231] The surface type parameters of the aspheric lens of the optical lens in the embodiment 12 are shown in Table 12-2.

[0232] Table 12-2

[0233]

[0234] In the embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown in FIG. 12A, FIG. 12B and FIG. 12C respectively. Figure 46 、 Figure 47 、 Figure 48 From FIG. 12A, it can be seen that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which shows that the optical lens can well correct the field curvature. Figure 46 From FIG. 12B, it can be seen that the distortion of the optical lens is controlled within ±2%, which shows that the optical lens can well correct the distortion. Figure 47 From FIG. 12C, it can be seen that 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 is uniformly and smoothly decreased from the center to the edge of the field of view, which has good imaging quality and good detail resolution ability in the low frequency and high frequency conditions. Figure 48 Embodiment 13

[0235] As shown in FIG. 13, it is a structural schematic diagram of the optical lens provided in the embodiment 13 of the present application. Compared with the embodiment 1, the main difference lies in that the object side S1 of the first lens L1 is a convex surface; the image side S2 of the first lens L1 is a concave surface; the object side S5 of the third lens L3 is a concave surface; the object side S11 of the sixth lens L6 is a convex surface; the image side S12 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0236] Figure 49 From FIG. 13A, it can be seen that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which shows that the optical lens can well correct the field curvature.

[0237] ​The related parameters of the lenses in the optical lens in Embodiment 13 are shown in Table 13-1.

[0238] Table 13-1

[0239]

[0240] The surface shape parameters of the aspheric lenses of the optical lens in Embodiment 13 are shown in Table 13-2.

[0241] Table 13-2

[0242]

[0243] In this embodiment, the field curvature curve, F-Tan(Theta) distortion curve and MTF curve of the optical lens are shown in Figure 50 , Figure 51 , Figure 52 respectively. As can be seen from Figure 50 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which indicates that the optical lens can well correct the field curvature. As can be seen from Figure 51 , the distortion of the optical lens is controlled within ±2%, which indicates that the optical lens can well correct the distortion. As can be seen from Figure 52 , the MTF value of this embodiment is above 0.5 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 the optical lens has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0244] Please refer to Table 14, which shows the optical properties of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view, the chief ray angle CRA at the maximum image height, the maximum field of view FOV and the numerical value corresponding to each conditional expression in each embodiment.

[0245] Table 14-1

[0246]

[0247] Table 14-2

[0248]

[0249] In summary of the above embodiments, the optical lens provided by the present 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 can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as large target surface, large aperture, high imaging quality, etc.

[0250] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0251] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, six pieces of lenses in total, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with positive refractive power; a second lens with negative refractive power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens with positive refractive power, the image side surface of the third lens is a convex surface; a fourth lens with positive refractive power, the object side surface of the fourth lens is a convex surface; a fifth lens with negative refractive power, the image side surface of the fifth lens is a concave surface; a sixth lens with positive refractive power; at least one of the first lens, the third lens and the sixth lens is a meniscus lens; the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy: 22.17≥|(R1+R2) / (R1-R2)|>1.8; the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 8≥f1 / f>3; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -1.54≤f2 / f<-0.9; the effective focal length f of the optical lens satisfies: 14mm<f<16mm; the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.6<IH / f<0.

7.

2. The optical lens of claim 1, wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2<TTL / f<2.

5.

3. The optical lens of claim 1, wherein, the effective focal length f of the optical lens, the maximum field angle FOV of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.95<(IH / 2) / (f×tan(FOV / 2))<1.

05.

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

45.

5. The optical lens of claim 1, wherein, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 70<180°×TTL / (IH / 2) / (FOV / 2)<73.

6. The optical lens of claim 1, wherein, the total sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis and the total optical length TTL of the optical lens satisfy: 0.55<∑CT / TTL<0.

85.

7. The optical lens of claim 1, wherein, the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: -2.09≤(R3+R4) / (R3-R4)<-1.

2.

8. The optical lens of claim 1, wherein, the object side surface curvature radius R11 of the sixth lens and the image side surface curvature radius R12 of the sixth lens satisfy: 19.95≥|(R11+R12) / (R11-R12)|>1.

8.

9. The optical lens of claim 1, wherein, the image side surface curvature radius R6 of the third lens and the object side surface curvature radius R7 of the fourth lens satisfy: 87.63≥|(R6-R7) / (R6+R7)|>3.

10. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.9<f3 / f<1.3.

Images