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

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 forward collision warning, lane deviation warning and pedestrian detection functions. 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 getting 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, normal use in weak light and harsh environment.

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

[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) < -0.4.

[0007] In some embodiments, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface satisfy: -0.85 < (R9-R10) / (R9+R10) < -0.65.

[0008] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 < TTL / f < 2.5.

[0009] In some embodiments, the optical lens satisfies: 0.95 < (IH / 2) / (f*Tan(FOV / 2)) < 1.05, where IH is the image height corresponding to the maximum field angle of the optical lens, f is the effective focal length of the optical lens, and FOV is the maximum field angle of the optical lens.

[0010] In some embodiments, the optical lens satisfies: 50 < 180°*TTL / (IH / 2) / (FOV / 2) < 80, where TTL is the total optical length of the optical lens, IH is the image height corresponding to the maximum field angle of the optical lens, and FOV is the maximum field angle of the optical lens.

[0011] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.0 < f1 / f < -1.2.

[0012] In some embodiments, the effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: f5 / f < -1.

[0013] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.5 < R5 / f.

[0014] In some embodiments, the object side surface of the sixth lens is concave, and the image side surface is convex; or the object side surface of the sixth lens is convex, and the image side surface is concave.

[0015] Compared with the prior art, the optical lens provided by the present application adopts six lenses with optical power, and has at least one of the advantages of long focal length, miniaturization, low cost, high resolution, normal use in weak light and harsh environment, etc. through specific surface shape setting and reasonable optical power distribution. In particular, 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 to achieve miniaturization design. The object side surface of the fifth lens is concave, which can smoothly accept light rays, make the light rays emitted by the fourth 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 deviate towards the optical axis direction after passing through the second side surface of the fifth lens, which is conducive to reducing the system rear aperture. The shape of the fifth 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 1Structure 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. DETAILED DESCRIPTION

[0033] 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 accompanying 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.

[0034] 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, the first lens discussed below can also be referred to as a second lens or a third lens without departing from the teachings of the present application.

[0035] 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.

[0036] 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 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.

[0037] It should also be understood that the terms "comprises", "comprising", "includes", "including", "has", "having" and / or "contains", 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. Furthermore, as used herein, the term "and / or" means any one of the associated listed items or a combination of any of the associated listed items. In addition, when describing embodiments of the present application, the use of "may" means one or more embodiments of the present application. Also, the term "exemplary" is intended to mean an example or an illustration.

[0038] 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.

[0039] 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.

[0040] The present application provides an optical lens, which comprises six lenses, and sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens along an optical axis from an object side to an imaging surface, and the optical centers of the lenses are located on the same line.

[0041] In some embodiments, the first lens is arranged to have a negative focal power, which is beneficial to diverging light rays. Under the same field of view angle, 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.

[0042] 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 ray 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.

[0043] In some embodiments, the third lens is arranged to have a positive focal power, which is beneficial to 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 object side of the third lens is convex, and 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 after passing through the second side of the third lens, which is beneficial to reducing the rear end aperture of the system.

[0044] In some embodiments, the fourth lens is arranged to have a positive focal power, which is beneficial to converging light rays and can effectively correct the aberration of the optical lens, improve the imaging quality, and optimize the optical performance such as distortion, in cooperation with the fifth lens. The object side of the fourth lens is convex, 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.

[0045] In some embodiments, the fifth lens is arranged to have a negative focal power, which is beneficial for diverging light rays, so that the subsequent optical system has a larger light acceptance, and the optical performance can effectively correct various aberrations caused by the front lens, and the imaging quality of the optical lens is improved; the object side is concave, and the image side is convex, which 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 incident on the imaging surface so that the chief ray is parallel to the imaging surface, so that the proportion of the edge field of view in the imaging picture can be increased, the imaging clarity of the edge field of view is enhanced, and various aberrations caused by the front lens can be corrected, and the overall imaging quality of the optical lens is improved.

[0046] In some embodiments, the sixth lens is arranged to have a positive focal power, which is beneficial for receiving the front end light, improving the resolution, further, the fifth lens receives the compressed light of the front end positive lens, reduces the light angle, meets the requirement of CRA; and can optimize the spherical aberration and improve the imaging quality. Further, the object side of the sixth lens is convex, and the image side is concave; or the object side of the sixth lens is concave, and the image side is convex; which can effectively suppress the angle of the edge field of view incident on the imaging surface, and more light beams can be effectively transmitted to the imaging surface, and the imaging quality is improved.

[0047] 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 for the function of correcting aberration, which is beneficial to balance the structure of the whole optical system. In addition, when the diaphragm is located between the first lens and the second lens, the diaphragm aberration correction and the balance of the structure and focal length distribution of the front lens group and the rear lens group are facilitated.

[0048] 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.

[0049] In some embodiments, the effective focal length f of the optical lens satisfies: 13mm < f < 17mm. Satisfying the above range is beneficial for the optical lens to have a long focal characteristic, which can ensure the telephoto effect of the optical lens, so that the system has a larger magnification, and has a better imaging quality for the scene in a relatively far field of view.

[0050] In some embodiments, the maximum field of view angle of the optical lens satisfies: 30° < FOV < 40°. Satisfying the above range is beneficial for the optical lens to have a suitable field of view angle, which can clearly shoot a target at a long distance.

[0051] In some embodiments, the optical lens satisfies: 1.4 < FNO < 1.8. Satisfying the above range is conducive to achieving a large aperture characteristic, and ensuring a clear image in a low-light environment or at night.

[0052] In some embodiments, the optical lens satisfies: 14° < CRA < 21°. Satisfying the above range can make the CRA of the optical lens have a larger allowable error range with the CRA of the photosensitive element of the chip, thereby improving the adaptation capability of the optical lens to the image sensor.

[0053] In some embodiments, the optical lens satisfies: 1.5 < TTL / f < 2.5. Satisfying the above range can effectively compress the total length, ensure sufficient space for adjusting the lens structure, and optimize the imaging effect of the optical lens.

[0054] In some embodiments, the optical lens satisfies: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.05. Satisfying the above range can make the distortion of the optical lens be better controlled, have a small distortion characteristic, and improve the resolving power of the optical lens.

[0055] In some embodiments, the optical lens satisfies: 0.58 < IH / f < 0.7. Satisfying the above range can ensure matching a chip with a large image surface, so that the optical lens has the characteristics of long focal length and large image surface.

[0056] In some embodiments, the optical lens satisfies: 0.2 < BFL / f < 0.4. Satisfying the above range can balance the imaging quality and the length of the optical back focal length, which is conducive to ensuring the imaging quality of the optical lens, avoiding interference between the lens and other elements, reducing the assembly process difficulty of the camera module, and improving the production yield.

[0057] In some embodiments, the optical lens satisfies: 50 < 180° x TTL / (IH / 2) / (FOV / 2) < 80. Satisfying the above range can limit the length of the optical lens under the condition of the same imaging area and the same field of view, thereby realizing miniaturization of the optical lens.

[0058] In some embodiments, the total length of the optical lens TTL and the sum of the central thicknesses of the first lens to the sixth lens along the optical axis respectively ∑CT satisfy: 0.55 < ∑CT / TTL < 0.75. Satisfying the above range, the total length of the optical lens can be compressed, so that the structure of the optical lens is more compact.

[0059] In some embodiments, the first lens has a light passing half aperture d1, the image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 3.3 < d1 / (IH / 2) / Tan(FOV / 2) < 4. Satisfying the above range, the front aperture can be small while the optical lens has a suitable field of view and image height, which is beneficial to the miniaturization of the optical lens.

[0060] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2 < f1 / f < -1.2. Satisfying the above range, a wide range of light rays can enter the optical lens to obtain more picture information, and it is also helpful to control lens distortion and reduce field curvature to improve the geometric accuracy of the imaging surface.

[0061] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.9 < f2 / f. Satisfying the above range, the light rays can be converged while the light ray deflection angle is reduced to make the light ray trend transition smoothly, and various aberrations generated by the front lens can be balanced to improve the imaging quality of the optical lens. Preferably, 1.9 < f2 / f < 6.8.

[0062] In some embodiments, the effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.9 < f3 / f < 1.6. Satisfying the above range, the light ray deflection angle can be reduced to make the light ray trend transition smoothly, and various aberrations generated by the front lens can be balanced to improve the imaging quality of the optical lens.

[0063] In some embodiments, the effective focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1 < f4 / f. Satisfying the above range, the light rays exiting from the fourth lens can be converged and adjusted to slow down the turning trend and convergence degree of the light rays to make the light rays transition smoothly, and various aberrations generated by the front lens can be balanced to improve the overall imaging quality of the optical lens. Preferably, 1 < f4 / f < 1.3.

[0064] In some embodiments, the effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: f5 / f < -1. Satisfying the above range, the imaging area can be increased, and the fourth lens and the fifth lens can be matched to optimize the lens chromatic aberration and improve the imaging quality. Preferably, -1.8 < f5 / f < -1.

[0065] In some embodiments, the effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 7.5 < f6 / f. Satisfying the above range can optimize the spherical aberration, improve the imaging quality, and suppress the angle of the edge field of view incident on the imaging surface, effectively transfer more light beams to the imaging surface, and improve the imaging quality. Preferably, 7.5 < f6 / f < 26.

[0066] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.5 < R5 / f. Satisfying the above range can make the convex surface face the object side, converge the edge field of view light, and improve the edge field of view imaging quality. Preferably, 0.5 < R5 / f < 1.2.

[0067] 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) < -0.4. Satisfying the above range is conducive to smooth transition of light to the rear, collects more light into the lens, realizes small aperture and short total length, and improves the resolving power.

[0068] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface satisfy: 1 < |(R5-R6) / (R5+R6)|. Satisfying the above range is helpful to control the edge field of view light beam trend to increase the image height, while reducing the off-axis aberration of the optical lens. Preferably, 1 < |(R5-R6) / (R5+R6)| < 10.

[0069] In some embodiments, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface satisfy: -0.85 < (R9-R10) / (R9+R10) < -0.65. Satisfying the above range is conducive to reducing the field curvature, and reducing the difficulty of field curvature correction of the subsequent lens, and improving the imaging quality.

[0070] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: -0.9 < R1 / f < -0.6. Satisfying the above range can make the concave surface face the object side, play a role in diverging light, and the light passing through the object side surface of the first lens can make the subsequent lens have a larger light acceptance surface.

[0071] In some embodiments, the curvature radius R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: R2 / f < -1.8. Satisfying the above range can make the convex surface face the image side, converge the light, and be conducive to controlling the aperture of the rear lens, and realizing miniaturization design. Preferably, -5.7 < R2 / f < -1.8.

[0072] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -1.3 < R9 / f < -0.6. Satisfying the above range can make the concave surface face the object side, smoothly receive the light, make the light emitted by the fourth lens smoothly enter the rear optical system, reduce the generation of aberration, and improve the imaging quality.

[0073] In some embodiments, the radius of curvature R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: -7.5 < R10 / f < -6. Satisfying the above range can make the convex surface face the image side, make the edge field of view light deviate towards the optical axis direction after passing through the second side surface of the fifth lens, and be conducive to reducing the system rear aperture.

[0074] 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: 0.7 < R11 / R12 < 1.2. Satisfying the above range can define the sixth lens as a properly curved meniscus lens, which is helpful to control the smoothness of the light, suppress the angle of the edge field of view incident on the imaging surface, and effectively transmit more light beams to the imaging surface, thereby improving the imaging quality.

[0075] 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 this application, in order to improve the imaging quality of the lens, each lens is a glass 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 an aspherical surface. 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.

[0076] 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:

[0077]

[0078] wherein z is the distance of the curved surface from the vertex of the curved surface in the optical axis direction, h is the distance of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and 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.

[0079] 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.

[0080] Embodiment 1

[0081] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in the embodiment 1 of the application, the optical lens includes, along the optical axis from the object side to the imaging surface S15, 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 in sequence.

[0082] Among them, the first lens L1 is a spherical lens with negative focal power, 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 power, the object side S3 of the second lens is a convex surface, and the image side S4 of the second lens is a concave surface; the third lens L3 is a spherical lens with positive focal power, the object side S5 of the third lens is a convex 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 power, the object side S7 of the fourth lens is a convex surface, and the image side S8 of the fourth lens is a concave surface; the fifth lens L5 is a spherical lens with negative focal power, the object side S9 of the fifth lens is a concave surface, and the image side S10 of the fifth lens is a convex surface; the sixth lens L6 is an aspherical lens with positive focal power, the object side S11 of the sixth lens is a convex surface, and the image side S12 of the sixth lens is a concave surface; the object side S13 and the image side S14 of the filter G1 are both flat surfaces.

[0083] Specifically, the design parameters of each lens of the optical lens provided in the embodiment are shown in Table 1-1.

[0084] Table 1-1

[0085]

[0086] The surface type coefficients of each aspherical surface of the optical lens in the embodiment are shown in Table 1-2.

[0087] Table 1-2

[0088]

[0089]

[0090] Figure 2 The field curvature curve of the embodiment 1 is shown, which represents the bending degree of the meridional image surface and the sagittal image surface of the light rays of different wavelengths, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.1mm~0.1mm, which shows that the optical lens can well correct the field curvature.

[0091] Figure 3 The distortion curve of the embodiment 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 -0.5%~0.5%, 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 unfolded image is effectively improved.

[0092] Figure 4 The 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. As can be seen from the figure, the MTF value of the embodiment 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 field of view, and has good imaging quality and good detail resolution ability in low frequency and high frequency conditions.

[0093] Embodiment 2

[0094] 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 above-mentioned embodiment 1, 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.

[0095] Specifically, the design parameters of each lens of the optical lens provided by the embodiment are shown in Table 2-1.

[0096] Table 2-1

[0097]

[0098]

[0099] The surface type coefficients of each aspheric surface of the optical lens in the embodiment are shown in Table 2-2.

[0100] Table 2-2

[0101] Face No. K A B C S3 -4.74E+01 0.00E+00 0.00E+00 2.36E-06 S4 -4.68E+00 0.00E+00 0.00E+00 1.03E-07 S11 -2.47E-01 0.00E+00 -6.22E-04 -7.70E-05 S12 -1.85E-01 0.00E+00 -1.09E-04 -1.27E-04 Face No. D E F S3 -1.01E-07 2.61E-09 -2.52E-11 S4 2.51E-08 -7.31E-10 9.16E-12 S11 -2.23E-06 8.47E-08 -6.57E-10 S12 -4.37E-06 3.36E-07 -6.47E-09

[0102] Figure 6 to Figure 8 The field curvature curve, the distortion curve and the modulation transfer function (MTF) curve of the optical lens of the embodiment 2 are shown respectively. As shown in 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 0-1%, 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 the low frequency and high frequency conditions.

[0103] Embodiment 3

[0104] Please refer to Figure 9 , which is a structural schematic diagram of the optical lens provided by the embodiment 3 of the present application. The optical lens of the embodiment is substantially the same as the optical lens of the above-mentioned embodiment 1, 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.

[0105] Specifically, the design parameters of each lens of the optical lens provided by the embodiment are shown in Table 3-1.

[0106] Table 3-1

[0107]

[0108]

[0109] The aspheric surface coefficients of the optical lens in the embodiment are shown in Table 3-2.

[0110] Table 3-2

[0111] Face No. K A B C S3 5.01E+01 0.00E+00 0.00E+00 2.93E-06 S4 9.09E-01 0.00E+00 0.00E+00 4.43E-07 S11 -2.60E-01 0.00E+00 -4.74E-04 -5.25E-05 S12 -3.90E-01 0.00E+00 2.56E-04 -8.61E-05 Face No. D E F S3 -8.58E-08 2.71E-09 -2.64E-11 S4 3.58E-08 -6.84E-10 9.89E-12 S11 -3.53E-06 9.56E-08 -9.30E-10 S12 -6.03E-06 2.89E-07 -3.84E-09

[0112] Figure 10 to Figure 12 The field curvature curve, the distortion curve and the modulation transfer function (MTF) curve of the optical lens of the embodiment 3 are shown respectively. As shown in the figures, 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-0.5%-0.5%, which indicates that the optical lens has small distortion; the MTF value of the optical lens is above 0.3 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 the low frequency and high frequency conditions.

[0113] Embodiment 4

[0114] Referring to Figure 13 , a structural schematic diagram of an optical lens provided by Embodiment 4 of the present application is shown. The optical lens of the present embodiment is substantially the same as that of Embodiment 1 described above, except that the fourth lens has a negative focal power, and the curvature radius of each lens surface, the thickness of each lens, the aspheric surface coefficients of each lens, and the like are different.

[0115] Specifically, the design parameters of each lens of the optical lens provided by the present embodiment are shown in Table 4-1.

[0116] Table 4-1

[0117]

[0118]

[0119] The aspheric surface coefficients of each lens of the optical lens in the present embodiment are shown in Table 4-2.

[0120] Table 4-2

[0121] Face No. 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 Face No. 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

[0122] Figure 14 to Figure 16 The field curvature curve, the distortion curve, and the modulation transfer function (MTF) curve of Embodiment 4 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 -0.1mm-0.05mm, which indicates that the optical lens can correct the field curvature well; the distortion value is controlled within 0-2.5%, 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.

[0123] Referring to Table 5, the optical properties corresponding to the optical lenses provided in the above four embodiments are shown, 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 of incidence CRA, the optical back focal length BFL, and the numerical values corresponding to each conditional expression in each embodiment.

[0124] Table 5

[0125] Parameter and Condition Formula Example 1 Example 2 Example 3 Example 4 f (mm) 15.02 14.83 14.96 14.70 FOV (°) 35.00 35.00 35.00 35.00 EPD (mm) 9.39 9.27 9.35 9.19 TTL (mm) 24.37 29.01 28.57 34.61 FNO 1.60 1.60 1.60 1.60 IH (mm) 9.42 9.40 9.43 9.41 CRA (°) 19.23 19.00 18.80 16.04 BFL (mm) 4.53 5.22 5.66 3.47 TTL / f 1.62 1.96 1.91 2.36 (IH / 2) / (f x Tan(FOV / 2)) 0.99 1.00 1.00 1.02 IH / f 0.63 0.63 0.63 0.64 BFL / f 0.30 0.35 0.38 0.24 180° x TTL / (IH / 2) / (FOV / 2) 53.21 63.51 62.34 75.65 ∑CT / TTL 0.57 0.63 0.66 0.69 d1 / (IH / 2) / Tan(FOV / 2) 3.49 3.57 3.49 3.75 f1 / f -1.55 -1.82 -1.89 -1.33 f2 / f 6.66 4.79 4.65 2.01 f3 / f 1.07 1.43 1.49 1.30 f4 / f 1.10 1.17 1.07 1.17 f5 / f -1.04 -1.25 -1.19 -1.60 f6 / f 8.02 25.08 24.87 25.31 R5 / f 1.05 0.67 0.69 0.83 (R1-R2) / (R1+R2) -0.58 -0.57 -0.48 -0.73 (R5-R6) / (R5+R6) 9.01 -1.06 -1.02 -2.81 (R9-R10) / (R9+R10) -0.81 -0.79 -0.80 -0.72 R1 / f -0.70 -0.78 -0.72 -0.80 R2 / f -2.68 -2.87 -2.06 -5.12 R9 / f -0.70 -0.80 -0.76 -1.13 R10 / f -6.66 -6.74 -6.69 -6.80 R11 / R12 1.01 1.09 1.09 0.81

[0126] In summary, the optical lens in the embodiment of the present application adopts six lenses with optical power, and by reasonably distributing 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, long focal length (fmax is 15.02mm), large aperture (FNOmin is 1.60) and high pixel balance can be achieved, so as to meet the use requirements of the vehicle-mounted lens.

[0127] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0128] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all 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, sequentially include from the object side to the imaging plane along the optical axis: 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 object side surface of which is a convex surface and the image side surface of which is a convex surface; a fourth lens with positive refractive power, the object side surface of which is a convex surface; a fifth 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 sixth lens with positive refractive power; the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -0.85 < (R9-R10) / (R9+R10) < -0.65; the optical total 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: 50 < 180°×TTL / (IH / 2) / (FOV / 2) < 80.

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

4.

3. The optical lens of claim 1, wherein, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -0.81 ≤ (R9-R10) / (R9+R10) ≤ -0.

72.

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: 1.5 < TTL / f < 2.

5.

5. The optical lens of claim 1, wherein, 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×Tan(FOV / 2)) < 1.

05.

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 angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 53.21 ≤ 180°×TTL / (IH / 2) / (FOV / 2) ≤ 75.

65.

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: -2.0 < f1 / f < -1.

2.

8. The optical lens of claim 1, wherein, the effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.8 < f5 / f < -1.

9. The optical lens of claim 1, wherein, the radius of curvature R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.5 < R5 / f < 1.

2.

10. The optical lens of claim 1, wherein, the object side surface of the sixth lens is a concave surface and the image side surface of the sixth lens is a convex surface, or the object side surface of the sixth lens is a convex surface and the image side surface of the sixth lens is a concave surface.

Images