Optical lens

Abstract

The application discloses 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 negative optical power, wherein the object side surface is a concave surface and the image side surface is a convex surface; a second lens with positive optical power; a third lens with positive optical power, wherein the image side surface is a convex surface; a fourth lens with positive optical power; a fifth lens with negative optical power; and a sixth lens with positive optical power, wherein the object side surface is a concave surface and the image side surface is a convex surface. The optical lens has the advantages of long focal length, miniaturization, low cost, high resolution, and at least one of normal use in weak light and harsh environment.

Description

TECHNICAL FIELD

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

[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are used more and more in intelligent driving, and the position of vehicle optical lenses in the automobile industry is continuously improved.

[0003] In the vehicle camera, the front-view camera is the core component of the ADAS (Advanced Driver Assistance System), mainly responsible for functions such as forward collision warning, lane deviation warning, and pedestrian detection. At present, the front-view camera is 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 the front-view camera in the vehicle camera system. With the rapid development of advanced driving assistance systems, the requirements for front-view lenses are also becoming higher and higher. Therefore, it is necessary to develop an optical lens with good imaging effect. SUMMARY

[0004] Therefore, the purpose of the present application is to provide an optical lens with at least one of the advantages of long focal length, miniaturization, low cost, high resolution, and normal use in weak light and harsh environments.

[0005] The present application provides an optical lens, which includes six lenses in order from the object side to the imaging surface along the optical axis: a first lens with negative focal power, the object side surface of which is concave, and the image side surface of which is convex; a second lens with positive focal power; a third lens with positive focal power, the image side surface of which is convex; a fourth lens with positive focal power; a fifth lens with negative focal power; and a sixth lens with positive focal power, the object side surface of which is concave, and the image side surface of which is convex.

[0006] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface satisfy: -0.8 < (R1-R2) / (R1+R2) < -0.1.

[0007] In some embodiments, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface satisfy: |(R11-R12) / (R11+R12)| < 0.6.

[0008] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < TTL / f < 2.5.

[0009] In some embodiments, the optical lens satisfies: 0.95 < (IH / 2) / (f*Tan(FOV / 2)) < 1.1, where IH is an image height corresponding to a maximum field of view of the optical lens, f is an effective focal length of the optical lens, and FOV is the maximum field of view of the optical lens.

[0010] In some embodiments, the optical lens satisfies: 55 < 180°*TTL / (IH / 2) / (FOV / 2) < 80, where TTL is a total track length of the optical lens, IH is an image height corresponding to a maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens.

[0011] In some embodiments, the optical lens satisfies: f1 / f < -1.2, where f1 is an effective focal length of the first lens, and f is an effective focal length of the optical lens.

[0012] In some embodiments, the optical lens satisfies: 0.9 < f6 / f, where f6 is an effective focal length of the sixth lens, and f is an effective focal length of the optical lens.

[0013] In some embodiments, the optical lens satisfies: R6 / f < -0.5, where R6 is a radius of curvature of an image side surface of the third lens, and f is an effective focal length of the optical lens.

[0014] In some embodiments, the optical lens satisfies: 3.3 < d1 / (IH / 2) / Tan(FOV / 2) < 4.7, where d1 is a half diameter of an object side surface of the first lens, IH is an image height corresponding to a maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens.

[0015] Compared with the prior art, the optical lens provided by the present application adopts six lenses with optical power, and has the advantages of long focal length, miniaturization, low cost, high resolution, and at least one of normal use in weak light and harsh environment. Especially, the object side surface of the first lens is concave, which plays a role in diverging light rays, and the light rays passing through the object side surface of the first lens can make the subsequent lenses have a larger light acceptance surface. The image side surface is convex, which converges light rays and is conducive to controlling the aperture of the rear lens, achieving miniaturization design. The object side surface of the sixth lens is concave, which can smoothly accept light rays, make the light rays emitted by the fifth lens smoothly enter the rear optical system, reduce the generation of aberration, and improve the imaging quality. The image side surface is convex, which makes the edge field of view light rays deflect towards the optical axis direction after passing through the second side surface of the sixth lens, which is conducive to reducing the system rear aperture. The shape of the sixth lens is a crescent shape, and the difference between the changes of the two surfaces is small with temperature change, which is conducive to achieving better thermal stability performance at high temperature, so that the optical lens can better meet the use requirements of vehicle-mounted lenses. BRIEF DESCRIPTION OF DRAWINGS

[0016] 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:

[0017] Figure 1 Structure diagram of the optical lens of embodiment 1 of the present application.

[0018] Figure 2 Field curvature curve diagram of the optical lens of embodiment 1 of the present application.

[0019] Figure 3 F-Tan(Theta) distortion curve diagram of the optical lens of embodiment 1 of the present application.

[0020] Figure 4 MTF curve diagram of the optical lens of embodiment 1 of the present application.

[0021] Figure 5 Structure diagram of the optical lens of embodiment 2 of the present application.

[0022] Figure 6 Field curvature curve diagram of the optical lens of embodiment 2 of the present application.

[0023] Figure 7 F-Tan(Theta) distortion curve diagram of the optical lens of embodiment 2 of the present application.

[0024] Figure 8 MTF curve diagram of the optical lens of embodiment 2 of the present application.

[0025] Figure 9 Structure diagram of the optical lens of embodiment 3 of the present application.

[0026] Figure 10 Field curvature curve diagram of the optical lens of embodiment 3 of the present application.

[0027] Figure 11 F-Tan(Theta) distortion curve diagram of the optical lens of embodiment 3 of the present application.

[0028] Figure 12 MTF curve diagram of the optical lens of embodiment 3 of the present application.

[0029] Figure 13 Structure diagram of the optical lens of embodiment 4 of the present application.

[0030] Figure 14 Field curvature curve diagram of the optical lens of embodiment 4 of the present application.

[0031] Figure 15 F-Tan(Theta) distortion curve diagram of the optical lens of embodiment 4 of the present application.

[0032] Figure 16 MTF curve diagram of the optical lens of embodiment 4 of the present application.

[0033] Figure 17 Structure diagram of the optical lens of embodiment 5 of the present application.

[0034] Figure 18 Field curvature curve diagram of the optical lens of embodiment 5 of the present application.

[0035] Figure 19 F-Tan(Theta) distortion curve diagram of the optical lens of embodiment 5 of the present application.

[0036] Figure 20 MTF curve diagram of the optical lens of embodiment 5 of the present application.

[0037] Figure 21 Structure diagram of the optical lens of embodiment 6 of the present application.

[0038] Figure 22 Field curvature curve diagram of the optical lens of embodiment 6 of the present application.

[0039] Figure 23 F-Tan(Theta) distortion curve diagram of the optical lens of embodiment 6 of the present application.

[0040] Figure 24 MTF curve diagram of the optical lens of embodiment 6 of the present application.

[0041] Figure 25 Structure diagram of the optical lens of embodiment 7 of the present application.

[0042] Figure 26 Field curvature curve diagram of the optical lens of embodiment 7 of the present application.

[0043] Figure 27 F-Tan(Theta) distortion curve diagram of the optical lens of embodiment 7 of the present application.

[0044] Figure 28 MTF curve diagram of the optical lens of embodiment 7 of the present application.

[0045] Figure 29 Structure diagram of the optical lens of embodiment 8 of the present application.

[0046] Figure 30 Field curvature curve diagram of the optical lens of embodiment 8 of the present application.

[0047] Figure 31 F-Tan(Theta) distortion curve diagram of the optical lens of embodiment 8 of the present application.

[0048] Figure 32 MTF curve diagram of the optical lens of embodiment 8 of the present application. DETAILED DESCRIPTION

[0049] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the drawings. It is to be noted that these detailed descriptions are merely descriptive of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] It should be noted that the terms first, second, third, etc. are used herein only to distinguish one feature from another, and do not denote any limitation on the features. Thus, a first lens discussed below can also be called a second lens or a third lens, without departing from the teachings of the present application.

[0051] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0052] Herein, 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 defined, 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 defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the image plane is called the image side surface of the lens.

[0053] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "may" means that one or more embodiments of the present application. Also, the word "exemplary" is intended to mean an example or an illustration.

[0054] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0055] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0056] The present application provides an optical lens, which comprises six lenses in sequence along the optical axis from the object side to the imaging surface, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, and the optical centers of the lenses are located on the same straight line.

[0057] In some embodiments, the first lens is arranged to have a negative focal power, which is beneficial for diverging light rays. Under the same field of view angle condition, the light rays emitted from the image side of the first lens can make the subsequent optical system have a larger light acceptance surface, thereby reducing the front aperture. The object side is concave, which plays a role in diverging light rays. The light rays passing through the object side of the first lens can make the subsequent lens have a larger light acceptance surface. The image side is convex, which plays a role in converging light rays, is beneficial for controlling the aperture of the rear lens, and realizes miniaturization design.

[0058] In some embodiments, the second lens is arranged to have a positive focal power, which can converge the light rays passing through the first lens and reduce the height of the light rays, thereby reducing the aperture of the optical lens and slowing down the light turning trend to make it transition smoothly. Meanwhile, the second lens can balance various aberrations generated by the front lens and improve the overall imaging quality of the optical lens.

[0059] In some embodiments, the third lens is arranged to have a positive focal power, which is beneficial for receiving the light rays converged from the second lens, reducing the height of the light beam incident to the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens. The image side is convex, which can smoothly receive the light rays, make the light rays emitted from the second lens smoothly enter the rear optical system, reduce the generation of aberration, and improve the imaging quality. The edge field of view light rays can be deflected towards the optical axis direction after passing through the second side of the third lens, which is beneficial for reducing the rear end aperture of the system.

[0060] In some embodiments, the fourth lens is arranged to have a positive focal power, which can suppress the angle of the edge field of view incident on the imaging surface, effectively deliver more light beams to the imaging surface, and improve the imaging quality.

[0061] In some embodiments, the fifth lens is arranged to have a negative focal length, and can adjust the light rays passing through the central field of view and the edge field of view of the fifth lens, especially adjust the angle of the edge field of view light rays to make the chief ray parallel to the imaging surface, so as to increase the proportion of the edge field of view in the imaging picture, enhance the imaging clarity of the edge field of view, and correct various aberrations caused by the front lens, thereby improving the overall imaging quality of the optical lens.

[0062] In some embodiments, the sixth lens is arranged to have a positive focal length, which is beneficial to receive the front light rays and improve the resolution. Further, the fifth lens receives the compressed light rays of the front positive lens, reduces the angle of the light rays, and meets the requirement of CRA. The object side surface of the sixth lens is concave, and the image side surface is convex, which can optimize the spherical aberration and improve the imaging quality.

[0063] In some embodiments, the diaphragm can be arranged between the first lens and the second lens. It can be understood that the diaphragm can be used to limit the amount of light to change the brightness of the imaging. In addition, when the diaphragm is located between the first lens and the second lens, the diaphragm can reasonably distribute the functions of the first lens to the sixth lens. For example, the first lens can be used to receive light to a greater extent, and the second lens to the sixth lens can be used to correct aberrations, which is beneficial to balance the structure of the entire optical system. In addition, when the diaphragm is located between the first lens and the second lens, the diaphragm aberration can be corrected, and the structure and focal length distribution of the front lens group and the rear lens group can be balanced.

[0064] In some embodiments, the optical lens can further include a filter arranged between the sixth lens and the imaging surface, which is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0065] In some embodiments, the effective focal length f of the optical lens satisfies 13mm < f < 16mm. Satisfying the above range is beneficial to make the optical lens have a long focal length characteristic, ensure the telephoto effect of the optical lens, and make the system have a large magnification, which has a good imaging quality for the scene in a long distance.

[0066] In some embodiments, the maximum field of view angle FOV of the optical lens satisfies 30° < FOV < 40°. Satisfying the above range is beneficial to make the optical lens have a suitable field of view angle, which can clearly capture a long distance target.

[0067] In some embodiments, the aperture value FNO of the optical lens satisfies 1.4 < FNO < 1.8. Satisfying the above range is beneficial to realize a large aperture characteristic, which can ensure the clarity of the image in a weak light environment or at night.

[0068] In some embodiments, the chief ray of the maximum field angle of the optical lens satisfies: 14° < CRA < 21°, where CRA is the incident angle of the chief ray of the maximum field angle of the optical lens on the image plane. The range satisfies the above condition, which can make the CRA of the optical lens have a larger allowable error range with the CRA of the photosensitive element of the chip, and improve the adaptability of the optical lens to the image sensor.

[0069] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < TTL / f < 2.5. The range satisfies the above condition, which can effectively compress the total length, ensure sufficient space for adjusting the lens structure, and optimize the imaging effect of the optical lens.

[0070] In some embodiments, the image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.1. The range satisfies the above condition, which can better control the distortion of the optical lens, has the characteristic of small distortion, and can improve the resolving power of the optical lens.

[0071] In some embodiments, the image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.58 < IH / f < 0.75. The range satisfies the above condition, which can ensure that the chip matches a large image, so that the optical lens has the characteristics of long focal length and large image at the same time.

[0072] In some embodiments, the optical back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.2 < BFL / f < 0.4. The range satisfies the above condition, which can balance the imaging quality and the length of the optical back focal length, which is beneficial to ensure the imaging quality of the optical lens, avoid interference between the lens and other elements, reduce the assembly process difficulty of the camera module, and improve the production yield.

[0073] In some embodiments, the total optical length TTL of the optical lens, the image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 55 < 180° x TTL / (IH / 2) / (FOV / 2) < 80. The range satisfies the above condition, which can limit the length of the optical lens under the condition of the same imaging area and the same field angle, and realize the miniaturization of the optical lens.

[0074] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis satisfy: 0.45 < ∑CT / TTL < 0.75. The range satisfies the above condition, which can compress the total length of the optical lens, so that the structure of the optical lens is more compact.

[0075] In some embodiments, the first lens has a half-aperture diameter d1, an image height IH corresponding to a maximum field angle of the optical lens, and a maximum field angle FOV of the optical lens, and the following relationship is satisfied: 3 < d1 / (IH / 2) / Tan(FOV / 2) < 4.7. Satisfying the above range can make the front aperture small while satisfying the optical lens having a suitable field angle and image height, which is conducive to the miniaturization of the optical lens.

[0076] In some embodiments, the first lens has a focal length f1 and the optical lens has an effective focal length f, and the following relationship is satisfied: f1 / f < -1.2. Satisfying the above range can make a large range of light rays enter the optical lens to obtain more picture information, and is conducive to controlling lens distortion and reducing field curvature to improve the geometric accuracy of the imaging surface. Preferably, -6 < f1 / f < -1.2.

[0077] In some embodiments, the second lens has a focal length f2 and the optical lens has an effective focal length f, and the following relationship is satisfied: 1 < f2 / f. Satisfying the above range can reduce the light deflection angle while converging the light rays to make the light ray trend transition smoothly, and can balance various aberrations generated by the front lens to improve the imaging quality of the optical lens. Preferably, 1 < f2 / f < 7.

[0078] In some embodiments, the third lens has a focal length f3 and the optical lens has an effective focal length f, and the following relationship is satisfied: 1 < f3 / f < 1.9. Satisfying the above range can reduce the light deflection angle to make the light ray trend transition smoothly, and can balance various aberrations generated by the front lens to improve the imaging quality of the optical lens.

[0079] In some embodiments, the fourth lens has a focal length f4 and the optical lens has an effective focal length f, and the following relationship is satisfied: 0.7 < f4 / f. Satisfying the above range can converge and adjust the light rays exiting from the fourth lens to slow down the turning trend and convergence degree of the light rays to make the light rays transition smoothly, and can balance various aberrations generated by the front lens to improve the overall imaging quality of the optical lens. Preferably, 0.7 < f4 / f < 4.

[0080] In some embodiments, the fifth lens has a focal length f5 and the optical lens has an effective focal length f, and the following relationship is satisfied: -1.8 < f5 / f < -0.3. Satisfying the above range can increase the imaging area, and the fourth lens and the fifth lens in combination can optimize the lens chromatic aberration to improve the imaging quality.

[0081] In some embodiments, the sixth lens has a focal length f6 and the optical lens has an effective focal length f, and the following relationship is satisfied: 0.9 < f6 / f. Satisfying the above range can optimize the spherical aberration to improve the imaging quality, and suppress the angle of the edge field of view incident on the imaging surface to effectively deliver more light beams to the imaging surface to improve the imaging quality. Preferably, 0.9 < f6 / f < 27.

[0082] In some embodiments, the radius of curvature R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: R6 / f<-0.5. Satisfying the above range, the convex surface can be directed towards the image side, converging the marginal field of view light, and improving the imaging quality of the marginal field of view. Preferably, -1.9

[0083] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface satisfy: -0.8

[0084] 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 satisfy: |(R11-R12) / (R11+R12)|<0.6. Satisfying the above range, it is helpful to control the increase of the image height of the marginal field of view, while reducing the off-axis aberration of the optical lens, and is conducive to reducing the field curvature.

[0085] 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: -1.7

[0086] In some embodiments, 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: R2 / f<-1. Satisfying the above range, the convex surface can be directed towards the image side, converging the light, which is conducive to controlling the aperture of the rear lens, and realizing miniaturization design. Preferably, -11.4

[0087] 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: -3.7

[0088] In some embodiments, 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: -3.2

[0089] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface satisfy: 0.1 < R1 / R2 < 0.9. By satisfying the above range, the first lens can be defined as a face-shaped appropriate meniscus lens, which helps to reduce the incident light ray angle, avoid excessive light power concentration to cause excessive light deflection, control the light ray trend to be smooth, and improve the imaging quality.

[0090] As an embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens can be all-glass lenses or glass-plastic hybrid lenses, both of which can achieve good imaging effects. In the present application, in order to improve the imaging quality of the lens, glass lenses are used for each lens. At the same time, at least one of the object side surface or the image side surface of the second lens and the sixth lens is aspherical. The aspherical lens has the following characteristics: from the center of the lens to the periphery of the lens, the curvature is continuously changed, which is different from the spherical lens with constant curvature from the center of the lens to the periphery of the lens. The aspherical lens has better curvature radius characteristics and has the advantages of improving the distortion aberration and improving the astigmatism aberration.

[0091] In order to make the system have better optical performance, multiple aspherical lenses are used in the lens, and the shape of each aspherical surface of the optical lens satisfies the following equation:

[0092]

[0093] Wherein, z is the distance of the curved surface to 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, A, B, C, D, E and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order curved surface coefficients, respectively.

[0094] The present 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 preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the present application should be regarded as equivalent replacement methods, and are included in the protection scope of the present application.

[0095] Embodiment 1

[0096] Please refer to Figure 1 , which is a structure schematic diagram of the optical lens provided in the embodiment 1 of the present application. The optical lens comprises, along the optical axis from the object side to the imaging surface S14, a first lens L1, a stop 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.

[0097] The first lens L1 is a spherical lens with negative focal length, the object side S1 of the first lens is a concave surface, and the image side S2 of the first lens is a convex surface; the second lens L2 is an aspherical lens with positive focal length, the object side S3 of the second lens is a convex surface, and the image side S4 of the second lens is a convex surface; the third lens L3 is a spherical lens with positive focal length, the object side S5 of the third lens is a concave surface, and the image side S6 of the third lens is a convex surface; the fourth lens L4 is a spherical lens with positive focal length, the object side S7 of the fourth lens is a convex surface, and the image side of the fourth lens is a concave surface; the fifth lens L5 is a spherical lens with negative focal length, the object side of the fifth lens is a convex surface, and the image side S9 of the fifth lens is a concave surface, and the fourth lens L4 and the fifth lens L5 form a cemented lens, the cemented surface of which is S8; the sixth lens L6 is an aspherical lens with positive focal length, the object side S10 of the sixth lens is a concave surface, and the image side S11 of the sixth lens is a convex surface; the object side S12 and the image side S13 of the filter G1 are both planes.

[0098] Specifically, the design parameters of each lens of the optical lens provided in the embodiment are shown in Table 1-1.

[0099] Table 1-1

[0100]

[0101] The surface type coefficients of each aspherical surface of the optical lens in the embodiment are shown in Table 1-2.

[0102] Table 1-2

[0103] Surface Number K A B C S3 -1.89E+00 0.00E+00 0.00E+00 -8.77E-08 S4 -4.16E+01 0.00E+00 0.00E+00 4.13E-06 S10 7.12E+01 0.00E+00 5.15E-05 -3.22E-05 S11 4.16E+01 0.00E+00 5.62E-04 -8.00E-05 Surface Number D E F S3 -5.19E-08 -2.07E-10 -1.26E-11 S4 -4.73E-08 -1.87E-09 2.01E-11 S10 -2.18E-06 1.66E-07 -8.18E-09 S11 2.83E-06 -1.43E-07 2.74E-09

[0104] Figure 2 The field curvature curve of Example 1 is shown, which represents the bending degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.06mm~0.06mm, which shows that the optical lens can well correct the field curvature.

[0105] Figure 3 The distortion curve of Example 1 is shown, which represents the F-Tan(Theta) distortion of different field angles on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the distortion value is controlled within 0~1.2%, which shows that the optical lens has small distortion, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0106] Figure 4A modulation transfer function (MTF) curve of the embodiment 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 the embodiment is above 0.4 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0107] Embodiment 2

[0108] Please refer to Figure 5 , which is a structural schematic diagram of the optical lens provided by the embodiment 2 of the present application. The optical lens of the embodiment is substantially the same as the embodiment 1 described above, and the difference lies in that the curvature radius of each lens surface, the thickness of each lens, and the aspheric surface coefficient and other parameters are different.

[0109] Specifically, the design parameters of each lens of the optical lens provided by the embodiment are shown in Table 2-1.

[0110] Table 2-1

[0111]

[0112]

[0113] The aspheric surface coefficients of the optical lens in the embodiment are shown in Table 2-2.

[0114] Table 2-2

[0115] Surface Number K A B C S3 -3.77E+00 0.00E+00 0.00E+00 -1.36E-06 S4 5.83E+00 0.00E+00 0.00E+00 -3.56E-06 S10 5.55E+01 0.00E+00 -1.06E-03 -3.51E-05 S11 8.00E+01 0.00E+00 -3.07E-04 -2.47E-05 Surface Number D E F S3 -3.50E-07 8.73E-09 -1.28E-10 S4 -1.57E-07 2.92E-09 -1.58E-11 S10 6.86E-07 -2.42E-07 8.19E-09 S11 1.05E-06 -7.66E-08 2.93E-09

[0116] Figure 6 to Figure 8 The field curvature curve, the distortion curve, and the modulation transfer function (MTF) curve of the embodiment 2 are shown respectively. It can be seen from the figures that the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.12 mm-0.03 mm, which indicates that the optical lens can well correct the field curvature; the distortion value is controlled within 0-1.6%, which indicates that the optical lens has small distortion; the MTF value of the optical lens is above 0.35 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0117] Embodiment 3

[0118] Please refer to Figure 9Figure 3 shows a structural schematic diagram of an optical lens according to an embodiment of the present application, and the optical lens of this embodiment is substantially the same as that of the above-mentioned embodiment 1, except that the curvature radius of each lens surface, the thickness of each lens, the aspheric surface coefficient of each lens and the like are different.

[0119] Specifically, the design parameters of each lens of the optical lens according to this embodiment are shown in Table 3-1.

[0120] Table 3-1

[0121]

[0122]

[0123] The aspheric surface coefficients of each aspheric surface of the optical lens according to this embodiment are shown in Table 3-2.

[0124] Table 3-2

[0125] Surface Number K A B C S3 3.95E+01 0.00E+00 0.00E+00 -2.17E-05 S4 -3.18E+00 0.00E+00 0.00E+00 -1.40E-05 S11 -6.79E+00 0.00E+00 4.65E-04 1.74E-04 S12 -8.21E-01 0.00E+00 1.95E-03 6.15E-05 Surface Number D E F S3 1.64E-06 -3.77E-08 4.34E-10 S4 1.21E-06 -2.84E-08 4.01E-10 S11 -1.25E-05 3.72E-07 -5.33E-09 S12 -4.51E-06 5.69E-08 -1.51E-09

[0126] Figure 10 to Figure 12 The field curvature curve, the distortion curve and the modulation transfer function (MTF) curve of the optical lens according to this embodiment are shown in Figures 3-1, 3-2 and 3-3, respectively. As can be seen from the figures, the field curvature of the meridional image surface and the sagittal image surface is controlled within 0.05mm-0.2mm, which indicates that the optical lens can well correct the field curvature; the distortion value is controlled within 0-9%, which indicates that the optical lens has small distortion; the MTF value of the optical lens is above 0.2 within the full field of view, and within the range of 0-120lp / 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 both low frequency and high frequency cases.

[0127] Embodiment 4

[0128] Please refer to Figure 13 Figure 4 shows a structural schematic diagram of an optical lens according to an embodiment of the present application, and the optical lens of this embodiment is substantially the same as that of the above-mentioned embodiment 1, except that the fourth lens has negative focal power, and the curvature radius of each lens surface, the thickness of each lens, the aspheric surface coefficient of each lens and the like are different.

[0129] Specifically, the design parameters of each lens of the optical lens according to this embodiment are shown in Table 4-1.

[0130] Table 4-1

[0131]

[0132] The aspheric surface coefficients of each aspheric surface of the optical lens according to this embodiment are shown in Table 4-2.

[0133] Table 4-2

[0134] Surface Number K A B C S3 5.17E+01 0.00E+00 0.00E+00 -1.15E-05 S4 -1.81E+00 0.00E+00 0.00E+00 -2.85E-06 S11 -2.52E-01 0.00E+00 9.37E-04 1.67E-04 S12 -4.98E-01 0.00E+00 1.38E-03 1.06E-04 Surface Number D E F S3 8.60E-07 -2.07E-08 2.25E-10 S4 2.45E-07 -4.27E-09 4.64E-11 S11 -1.19E-05 3.93E-07 -5.54E-09 S12 -5.04E-06 8.99E-08 -2.75E-10

[0135] Figure 14 to Figure 16 The field curvature curve, distortion curve, and modulation transfer function (MTF) curve of Example 4 are shown respectively. As can be seen from the figures, the field curvature of the meridional and sagittal image planes is controlled within 0.05mm to 0.2mm, indicating that the optical lens can effectively correct field curvature; the distortion value is controlled within the range of 0% to 6%, indicating that the optical lens has low distortion; the MTF value of the optical lens is above 0.25 throughout the entire field of view, and within the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and good detail resolution at both low and high frequencies.

[0136] Example 5

[0137] Please see Figure 17 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 5 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1 above, except that the curvature radius of each lens surface, the thickness of each lens, the aspherical coefficient of each lens and other parameters are different.

[0138] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 5-1.

[0139] Table 5-1

[0140]

[0141] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 5-2.

[0142] Table 5-2

[0143] Surface Number K A B C S3 5.01E+01 0.00E+00 0.00E+00 -9.35E-06 S4 -2.21E+00 0.00E+00 0.00E+00 -1.03E-06 S11 -8.06E+01 0.00E+00 1.12E-03 6.83E-05 S12 -3.61E-01 0.00E+00 1.71E-03 2.57E-05 Surface Number D E F S3 6.89E-07 -1.68E-08 1.68E-10 S4 1.54E-07 -2.66E-09 2.83E-11 S11 -4.92E-06 1.65E-07 -2.23E-09 S12 -2.15E-06 3.77E-08 -6.43E-10

[0144] Figure 17 to Figure 20 The field curvature curve, distortion curve, and modulation transfer function (MTF) curve of Example 5 are shown respectively. As can be seen from the figures, the field curvature of the meridional and sagittal image planes is controlled within 0.05 mm to 0.2 mm, indicating that the optical lens can effectively correct field curvature; the distortion value is controlled within the range of 0 to 5%, indicating that the optical lens has low distortion; the MTF value of the optical lens is above 0.25 throughout the entire field of view, and within the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and good detail resolution at both low and high frequencies.

[0145] Example 6

[0146] Please see Figure 21 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 6 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1 above, except that the curvature radius of each lens surface, the thickness of each lens, the aspherical coefficient of each lens and other parameters are different.

[0147] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 6-1.

[0148] Table 6-1

[0149]

[0150] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 6-2.

[0151] Table 6-2

[0152] Surface Number K A B C S3 4.04E+01 0.00E+00 0.00E+00 3.50E-06 S4 -1.88E+01 0.00E+00 0.00E+00 2.16E-06 S11 -5.44E-01 0.00E+00 4.59E-03 5.09E-05 S12 -3.87E-01 0.00E+00 4.14E-03 -4.47E-06 Surface Number D E F S3 -9.13E-08 2.73E-09 -2.11E-11 S4 7.49E-08 -1.65E-09 3.03E-11 S11 -2.24E-06 -5.26E-08 6.94E-09 S12 2.25E-06 -1.63E-07 4.91E-09

[0153] Figure 22 to Figure 24 The field curvature curve, distortion curve, and modulation transfer function (MTF) curve of Example 6 are shown respectively. As can be seen from the figures, the field curvature of the meridional and sagittal image planes is controlled within -0.1 mm to 0.05 mm, indicating that the optical lens can effectively correct field curvature; the distortion value is controlled within the range of 0 to 2.5%, indicating that the optical lens has low distortion; the MTF value of the optical lens is above 0.2 throughout the entire field of view, and within the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, demonstrating good imaging quality and good detail resolution at both low and high frequencies.

[0154] Example 7

[0155] Please see Figure 25 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 7 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1 above, except that the curvature radius of each lens surface, the thickness of each lens, the aspherical coefficient of each lens and other parameters are different.

[0156] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 7-1.

[0157] Table 7-1

[0158]

[0159] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 7-2.

[0160] Table 7-2

[0161]

[0162]

[0163] Figure 26 to Figure 28 The field curvature curve, the distortion curve and the modulation transfer function (MTF) curve of the optical lens of Example 7 are shown respectively. It can be seen from the figures that the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.05mm~0.1mm, which indicates that the optical lens can correct the field curvature well; the distortion value is controlled within 0~2%, which indicates that the optical lens has small distortion; the MTF value of the optical lens is above 0.2 within the full field of view, and within the range of 0~120lp / mm, the MTF curve is uniformly and smoothly decreased 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.

[0164] Example 8

[0165] Please refer to Figure 29 , which is a structural schematic diagram of the optical lens provided by Example 8 of the present application. The optical lens of the present embodiment is substantially the same as that of Example 1 described above, and the difference lies in that the curvature radius of each lens surface, the thickness of each lens, the aspheric surface coefficient and other parameters are different.

[0166] Specifically, the design parameters of each lens of the optical lens provided by the present embodiment are shown in Table 8-1.

[0167] Table 8-1

[0168]

[0169] The aspheric surface coefficients of the optical lens in the present embodiment are shown in Table 8-2.

[0170] Table 8-2

[0171]

[0172]

[0173] Figure 30 to Figure 32The field curvature curve, the distortion curve and the modulation transfer function (MTF) curve of the optical lens of embodiment 8 are shown respectively. As can be seen from the figures, the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.05mm~0.05mm, which indicates that the optical lens can correct the field curvature well; the distortion value is controlled within 0~2%, which indicates that the optical lens has small distortion; the MTF value of the optical lens is above 0.4 within the full field of view, and within the range of 0~120lp / mm, the MTF curve is uniformly and smoothly decreased 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.

[0174] Please refer to Table 9, which shows the optical properties of the optical lens corresponding to the above-mentioned 8 embodiments, including the effective focal length f, the maximum field of view FOV, the pupil diameter EPD, the total optical length TTL, the aperture value FNO, the image height IH corresponding to the maximum field of view, the chief ray angle CRA, the optical back focal length BFL, and the numerical value corresponding to each conditional expression in each embodiment.

[0175] Table 9

[0176]

[0177]

[0178] Table 9 (continued)

[0179] Parameters and Conditional Expressions Example 5 Example 6 Example 7 Example 8 f (mm) 14.46 14.70 14.87 14.73 FOV (°) 35.00 35.00 35.00 35.00 EPD (mm) 9.04 9.19 9.29 9.21 TTL (mm) 33.83 34.61 31.19 32.28 FNO 1.60 1.60 1.60 1.60 IH (mm) 9.51 9.41 9.50 9.45 CRA (°) 17.73 16.04 16.14 17.11 BFL (mm) 3.50 3.47 4.55 3.49 TTL / f 2.34 2.36 2.10 2.19 (IH / 2) / (f x Tan(FOV / 2)) 1.04 1.02 1.01 1.02 IH / f 0.66 0.64 0.64 0.64 BFL / f 0.24 0.24 0.31 0.24 180° x TTL / (IH / 2) / (FOV / 2) 73.18 75.65 67.56 70.27 ∑CT / TTL 0.65 0.69 0.62 0.63 d1 / (IH / 2) / Tan(FOV / 2) 3.90 3.75 3.33 4.41 f1 / f -3.34 -1.33 -2.05 -3.19 f2 / f 1.53 2.01 6.73 2.39 f3 / f 1.30 1.30 1.39 1.22 f4 / f 2.73 1.17 0.83 0.92 f5 / f -0.51 -1.60 -0.68 -0.49 f6 / f 1.35 25.31 23.73 15.00 R6 / f -1.08 -1.76 -1.39 -0.81 (R1-R2) / (R1+R2) -0.24 -0.73 -0.34 -0.58 (R11-R12) / (R11+R12) 0.58 -0.10 0.07 0.09 R1 / f -0.72 -0.80 -0.61 -1.40 R2 / f -1.18 -5.12 -1.25 -5.27 R11 / f -2.43 -0.23 -2.76 -2.44 R12 / f -0.64 -0.28 -2.38 -2.03 R1 / R2 0.61 0.16 0.49 0.27

[0180] In summary, the optical lens in the embodiments of the present application adopts six lenses with optical power, and by reasonably allocating the optical power of each lens, reasonably matching the surface shape of each lens, reasonably setting the thickness of each lens and the distance between each lens, reasonably setting the position of the aperture, and setting the optical lens to have small distortion, the balance of long focal length (the maximum value of f is 14.87mm), large aperture (the minimum value of FNO is 1.60) and high pixels can be achieved, so as to meet the use requirements of the vehicle-mounted lens.

[0181] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0182] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope 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, the optical lens comprises: a first lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a second lens with positive refractive power; a third lens with positive refractive power, the image side surface of which is a convex surface; a fourth lens with positive refractive power; a fifth lens with negative refractive power; a sixth lens with positive refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; The optical total length TTL of the optical lens, the image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 55 < 180°×TTL / (IH / 2) / (FOV / 2) < 80. The curvature radius R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -3.7 < R11 / f < -0.

2. The curvature radius R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -3.2 < R12 / f < -0.

2.

2. The optical lens of claim 1, wherein, The curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface satisfy: -0.8 < (R1-R2) / (R1+R2) < -0.

1.

3. The optical lens of claim 1, wherein, The curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface satisfy: |(R11-R12) / (R11+R12)| < 0.

6.

4. The optical lens of claim 1, wherein, The optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < TTL / f < 2.

5.

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

1.

6. The optical lens of claim 1, wherein, The optical total length TTL of the optical lens, the image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 60.52 ≤ 180°×TTL / (IH / 2) / (FOV / 2) ≤ 75.

65. The curvature radius R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -3.39 ≤ R11 / f ≤ -0.

23. The curvature radius R12 of the image side surface of the sixth lens and the effective focal length f of the optical lens satisfy: -2.91 ≤ R12 / f ≤ -0.

28.

7. The optical lens of claim 1, wherein, The effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -6 < f1 / f < -1.

2.

8. The optical lens of claim 1, wherein, The effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.9 < f6 / f < 27.

9. The optical lens of claim 1, wherein, The curvature radius R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: -1.9 < R6 / f < -0.

5.

10. The optical lens of claim 1, wherein, The half light passing radius d1 of the object side surface of the first lens, the image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 3 < d1 / (IH / 2) / Tan(FOV / 2) < 4.7.

Images