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 concave surface; a second lens with positive optical power, wherein the object side surface is a convex surface; a third lens with positive optical power, wherein the object side surface is a convex surface; a fourth lens with positive optical power, wherein the object side surface is a convex surface and the image side surface is a concave surface; a fifth lens with negative optical power, wherein the image side surface is a concave 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 six lenses, and includes, 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 concave; a second lens with positive focal power, the object side surface of which is convex; a third lens with positive focal power, the object side surface of which is convex; a fourth lens with positive focal power, the object side surface of which is convex, and the image side surface of which is concave; a fifth lens with negative focal power, the image side surface of which is concave; 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: 1.2 < |(R1-R2) / (R1+R2)|.

[0007] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface satisfy: -0.95 < (R7-R8) / (R7+R8) < -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: 1.5 < TTL / f < 2.5.

[0009] In some embodiments, the optical lens satisfies: 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.1, where IH is an image height corresponding to a maximum field angle of the optical lens, f is an 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: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80, where TTL is an overall optical length of the optical lens, IH is an image height corresponding to a maximum field angle of the optical lens, and FOV is the maximum field angle of the optical lens.

[0011] In some embodiments, the optical lens satisfies: f1 / f < -0.7, 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: 0.7 < f4 / f < 1.2, where f4 is an effective focal length of the fourth lens, and f is an effective focal length of the optical lens.

[0013] In some embodiments, the optical lens satisfies: 0.6 < R5 / f, where R5 is a radius of curvature of an object 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: 0.2 < R10 / f < 0.7, where R10 is a radius of curvature of an image side surface of the fifth lens, and f is an effective focal length 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 at least one of the advantages of long focal length, miniaturization, low cost, high resolution, and normal use in weak light and harsh environment by specific surface shape setting and reasonable optical power distribution. In particular, the object side surface of the first lens is concave, and the image side surface is concave, which can reduce the effective working aperture of the first lens, and avoid the aperture of the rear lens of the optical lens being too large due to excessive divergence of light. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0017] Figure 1 FIG. 1 is a structural diagram of an optical lens according to an embodiment of the present application.

[0018] Figure 2 FIG. 2 is a field curvature curve of the optical lens according to the embodiment of the present application.

[0019] Figure 3 FIG. 3 is an F-Tan(Theta) distortion curve of the optical lens according to the embodiment of the present application.

[0020] Figure 4MTF curve of the optical lens in Embodiment 1 of the present application.

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

[0022] Figure 6 Curvature of field curve of the optical lens in Embodiment 2 of the present application.

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

[0024] Figure 8 MTF curve of the optical lens in Embodiment 2 of the present application.

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

[0026] Figure 10 Curvature of field curve of the optical lens in Embodiment 3 of the present application.

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

[0028] Figure 12 MTF curve of the optical lens in Embodiment 3 of the present application.

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

[0030] Figure 14 Curvature of field curve of the optical lens in Embodiment 4 of the present application.

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

[0032] Figure 16 MTF curve of the optical lens in Embodiment 4 of the present application.

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

[0034] Figure 18 Curvature of field curve of the optical lens in Embodiment 5 of the present application.

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

[0036] Figure 20A field curvature curve graph for the optical lens of Embodiment 5 of the present application.

[0037] Figure 21 A structure diagram of the optical lens of Embodiment 6 of the present application.

[0038] Figure 22 A field curvature curve graph for the optical lens of Embodiment 6 of the present application.

[0039] Figure 23 An F-Tan(Theta) distortion curve graph for the optical lens of Embodiment 6 of the present application.

[0040] Figure 24 An MTF curve graph for the optical lens of Embodiment 6 of the present application.

[0041] Figure 25 A structure diagram of the optical lens of Embodiment 7 of the present application.

[0042] Figure 26 A field curvature curve graph for the optical lens of Embodiment 7 of the present application.

[0043] Figure 27 An F-Tan(Theta) distortion curve graph for the optical lens of Embodiment 7 of the present application.

[0044] Figure 28 An MTF curve graph for the optical lens of Embodiment 7 of the present application. DETAILED DESCRIPTION

[0045] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only examples of embodiments of the present application and are not intended in any way to restrict the scope of the present application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens, without departing from the teachings of the present application.

[0047] In the drawings, the thickness, size, and shape of lenses have been exaggerated slightly for the sake of explanation. Specifically, the shape of a spherical surface or an aspherical surface shown in the drawings is shown by way of example. That is, the shape of a spherical surface or an aspherical surface is not limited to the shape of a spherical surface or an aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0048] In the present disclosure, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side surface of the lens.

[0049] 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 terms such as "at least one of", "one or more of", or "at least an embodiment" are used in the discussion of embodiments of the application, a set of one or more (e.g., 1, 2, 3, 4, or 5 or more) embodiments of the application are presented as examples. Not all combinations of features in the implementation of the application are presented as examples; however, one of ordinary skill in the art will recognize that the concepts described herein can be carried out in a variety of ways, including those specifically described herein and / or combinations of those specific embodiments.

[0050] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0051] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0052] The present application provides an optical lens, which includes six lenses in sequence from an object side to an imaging plane along an optical axis, 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.

[0053] In some embodiments, the first lens is configured to have a negative focal power, which is beneficial for diverging light rays. Under the same field of view angle, the light rays emitted from the image side surface of the first lens can provide a larger light acceptance for the subsequent optical system, thereby reducing the front aperture. The object side surface is concave, and the image side surface is concave, which can reduce the effective working aperture of the first lens and avoid the aperture of the lens at the rear of the optical lens being too large due to excessive divergence of the light rays.

[0054] In some embodiments, the second lens is arranged to have positive refractive power, which is conducive to converging light rays, and is matched with the first lens having negative refractive power, so as to reduce the total length of the optical lens and further reduce the rear aperture; the object side is convex, which can converge the light rays passing through the first lens and reduce the height of the light rays, so as to reduce the aperture of the optical lens, slow down the turning trend of the light rays, balance various aberrations generated by the front lens, and improve the overall imaging quality of the optical lens.

[0055] In some embodiments, the third lens is arranged to have positive refractive power, which is conducive to receiving the light rays converged by the second lens, reducing the height of the light beams incident on the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens; the object side is convex, which can smoothly receive the light rays, so that the light rays emitted by the second lens smoothly enter the rear optical system, reduce the generation of aberrations, 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 conducive to reducing the rear aperture of the system.

[0056] In some embodiments, the fourth lens is arranged to have positive refractive power, which is conducive to converging light rays, and is matched with the fifth lens, so as to effectively correct the aberration of the optical lens, improve the imaging quality, and optimize the optical performance such as distortion; the object side is convex, and the image side is concave, which can 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.

[0057] In some embodiments, the fifth lens is arranged to have negative refractive power, which is conducive to diverging light rays, so that the subsequent optical system has a larger light beam receiving surface, improves the optical performance, effectively corrects various aberrations brought by the front lens, and improves the imaging quality of the optical lens; the image side is concave, 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 rays incident on the imaging surface, so that the chief ray is parallel to the imaging surface, thereby improving the proportion of the edge field of view in the imaging picture, enhancing the imaging clarity of the edge field of view, and correcting various aberrations brought by the front lens, and improving the overall imaging quality of the optical lens.

[0058] In some embodiments, the sixth lens is arranged to have positive refractive power, which is conducive to receiving the front end light rays and improving the resolution. Further, the fifth lens receives the light rays compressed by the front end positive lens, reduces the angle of the light rays, meets the requirement of CRA, and can optimize the spherical aberration and improve the imaging quality.

[0059] In some embodiments, a 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 image. 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 the function of aberration, which is conducive to balancing the structure of the entire optical system. In addition, when the diaphragm is located between the first lens and the second lens, it is convenient to correct the diaphragm aberration and balance the structure and focal length distribution of the front lens group and the rear lens group.

[0060] In some embodiments, the optical lens can further include a filter arranged between the sixth lens and the imaging surface, to filter out interference light and prevent the interference light from reaching the imaging surface of the optical lens to affect normal imaging.

[0061] In some embodiments, the effective focal length f of the optical lens satisfies: 12mm < f < 17mm. Satisfying the above range is conducive to making the optical lens have a long focal length characteristic, ensuring the telephoto effect of the optical lens, and making the system have a larger magnification, which has a better imaging quality for the scene in a larger distance.

[0062] In some embodiments, the maximum field angle FOV of the optical lens satisfies: 30° < FOV < 40°. Satisfying the above range is conducive to making the optical lens have a suitable field angle, which can clearly capture a target at a distance.

[0063] In some embodiments, the aperture value FNO of the optical lens satisfies: 1.4 < FNO < 1.8. Satisfying the above range is conducive to realizing a large aperture characteristic, which can also ensure the clarity of the image in a weak light environment or at night.

[0064] In some embodiments, the maximum field angle chief ray angle CRA of 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 chip light sensing element, which improves the adaptation ability of the optical lens to the image sensor.

[0065] 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. Satisfying the above range can effectively compress the total length, ensure sufficient space to adjust the lens structure, and optimize the imaging effect of the optical lens.

[0066] 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. Satisfying the above range can better control the distortion of the optical lens, have the characteristic of small distortion, and improve the resolving power of the optical lens.

[0067] 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: 0.6 < IH / f < 0.75. Satisfying the above range can ensure that the chip matches a large image surface, so that the optical lens has the characteristics of long focal length and large image surface.

[0068] 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. Satisfying the above range can balance the optical back focal length between good imaging quality and ease of assembly, which is conducive to ensuring the imaging quality of the optical lens while avoiding interference between the lens and other elements, reducing the assembly process difficulty of the camera module, and improving the production yield.

[0069] 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: 45 < 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 angle, and realize the miniaturization of the optical lens.

[0070] 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: 0.5 < ∑CT / TTL < 0.8. Satisfying the above range can compress the total length of the optical lens, so that the structure of the optical lens is more compact.

[0071] In some embodiments, the half-light entrance radius d1 of the object side of the first 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: 2.9 < d1 / (IH / 2) / Tan(FOV / 2) < 4.3. Satisfying the above range can make the front aperture small under the condition that the optical lens has a suitable field angle and image height, which is conducive to the miniaturization of the optical lens.

[0072] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f <-0.7. Satisfying the above range, a large range of light rays can enter the optical lens, more image information can be obtained, and the lens distortion and field curvature can be controlled, and the geometric precision of the imaging surface can be improved. Preferably, -2.5

[0073] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.7

[0074] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1

[0075] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.7

[0076] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -0.8

[0077] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 1.7

[0078] In some embodiments, the curvature radius R3 of the object side of the second lens and the effective focal length f of the optical lens satisfy: 0.5

[0079] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 0.6 < R5 / f. Satisfying the above range, the convex surface can be directed to the object side, converging the marginal field of view light, and improving the imaging quality of the marginal field of view. Preferably, 0.6 < R5 / f < 7.

[0080] In some embodiments, the curvature radius R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 0.2 < R10 / f < 0.7. Satisfying the above range, the concave surface can be directed to the image side, converging the marginal field of view angle light, and improving the relative luminance of the optical lens.

[0081] 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: 1.2 < |(R1-R2) / (R1+R2)|. Satisfying the above range, the light is smoothly transitioned to the rear, more light is collected into the lens, the small aperture and short total length are realized, and the resolving power is improved. Preferably, 1.2 < |(R1-R2) / (R1+R2)| < 17.3.

[0082] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface satisfy: -0.95 < (R7-R8) / (R7+R8) < -0.6. Satisfying the above range, the trend of the marginal field of view light beam is controlled to increase the image height, while the off-axis aberration of the optical lens is reduced, and the field curvature is reduced.

[0083] 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: -1.8 < R1 / f < -0.9. Satisfying the above range, the concave surface can be directed to the object side, playing a role of 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.

[0084] 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: 0.9 < R2 / f. Satisfying the above range, the concave surface can be directed to the image side, playing a role of diverging light, and being beneficial to increasing the lens imaging area and improving the imaging quality. Preferably, 0.9 < R2 / f < 11.1.

[0085] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 0.4 < R7 / f < 0.65. Satisfying the above range, the convex surface can be directed to the object side, so that the light emitted by the third lens can smoothly enter the fourth lens, more light can be collected, the imaging surface detail quality can be improved, the generation of aberration can be reduced, and the imaging quality can be improved.

[0086] In some embodiments, the curvature radius R8 of the image side surface of the fourth lens and the effective focal length f of the optical lens satisfy: 3 < R8 / f. Satisfying the above range, the concave surface can be directed to the image side, and the edge field light rays can be deflected to the direction of the optical axis after passing through the second side surface of the fourth lens, which is beneficial to reducing the system back aperture. Preferably, 3 < R8 / f < 8.3.

[0087] 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, 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.

[0088] 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:

[0089]

[0090] 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.

[0091] The present application will be further described in the following embodiments. In each embodiment, the thickness, the curvature radius 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.

[0092] Embodiment 1

[0093] 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.

[0094] 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 concave 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 convex surface, and the image side S6 of the third lens is a concave 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 S8 of the fourth lens is a concave surface; the fifth lens L5 is a spherical lens with negative focal length, the object side S9 of the fifth lens is a concave surface, and the image side S10 of the fifth lens is a concave surface; the sixth lens L6 is an aspherical lens with positive focal length, the object side S11 of the sixth lens is a convex surface, and the image side S12 of the sixth lens is a convex surface; and the object side S13 and the image side S14 of the filter G1 are both flat surfaces.

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

[0096] Table 1-1

[0097]

[0098] The surface type coefficients of each aspherical surface of the optical lens in the embodiment are shown in Table 1-2.

[0099] Table 1-2

[0100]

[0101]

[0102] Figure 2 The field curvature curve of the embodiment 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-0.05mm~0.1mm, which shows that the optical lens can well correct the field curvature.

[0103] 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 0~2%, 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.

[0104] 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 0.25 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0105] Embodiment 2

[0106] 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 of each lens are different.

[0107] Specifically, the design parameters of each lens of the optical lens provided by the embodiment are shown in Table 2-1.

[0108] Table 2-1

[0109]

[0110]

[0111] The aspheric surface coefficients of the optical lens in the embodiment are shown in Table 2-2.

[0112] Table 2-2

[0113] Face No. K A B C S3 6.01E-01 0.00E+00 -3.56E-04 -4.45E-06 S4 2.59E+00 0.00E+00 7.42E-05 1.00E-06 S11 -1.32E+38 0.00E+00 -7.53E-04 -8.27E-05 S12 1.44E+01 0.00E+00 -1.53E-04 -1.26E-04 Face No. D E F S3 -8.87E-08 2.26E-09 -1.77E-10 S4 -3.21E-07 1.46E-08 -3.61E-10 S11 -3.49E-06 5.44E-07 -4.15E-08 S12 7.57E-06 -4.46E-07 8.06E-09

[0114] 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-0.05 mm-0.1 mm, which indicates that the optical lens can well correct the field curvature; the distortion value is controlled within 0-8%, which indicates that the optical lens has small distortion; the MTF value of the optical lens is above 0.2 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0115] Embodiment 3

[0116] Please refer to Figure 9Figure 3 shows a structural schematic diagram of an optical lens according to an embodiment of the present application. 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.

[0117] Specifically, the design parameters of each lens of the optical lens according to this embodiment are shown in Table 3-1.

[0118] Table 3-1

[0119]

[0120]

[0121] The aspheric surface coefficients of each aspheric surface of the optical lens in this embodiment are shown in Table 3-2.

[0122] Table 3-2

[0123] Face No. K A B C S3 7.43E-01 0.00E+00 -2.25E-04 8.81E-06 S4 4.14E+01 0.00E+00 2.68E-04 -1.62E-06 S11 4.09E+02 0.00E+00 9.60E-05 -8.83E-05 S12 2.63E+01 0.00E+00 5.41E-04 -1.01E-04 Face No. D E F S3 -6.83E-07 2.20E-08 -2.82E-10 S4 1.62E-07 -4.47E-09 5.87E-11 S11 4.86E-06 -3.36E-07 1.95E-09 S12 6.58E-06 -4.37E-07 9.09E-09

[0124] Figure 10 to Figure 12 The field curvature curve, the distortion curve, and the modulation transfer function (MTF) curve of the optical lens of embodiment 3 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 -0.1 mm-0.1 mm, which indicates that the optical lens can well correct the field curvature; the distortion value is controlled within 0-4%, 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 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and the optical lens has good imaging quality and good detail resolution ability in both low-frequency and high-frequency cases.

[0125] Embodiment 4

[0126] Please refer to Figure 13 Figure 4 shows a structural schematic diagram of an optical lens according to an embodiment of the present application. 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.

[0127] Specifically, the design parameters of each lens of the optical lens according to this embodiment are shown in Table 4-1.

[0128] Table 4-1

[0129]

[0130] The aspheric surface coefficients of each aspheric surface of the optical lens in this embodiment are shown in Table 4-2.

[0131] Table 4-2

[0132] Face No. K A B C S3 -6.96E-01 0.00E+00 0.00E+00 -4.63E-07 S4 5.00E+01 0.00E+00 0.00E+00 -2.68E-06 S11 -6.13E+00 0.00E+00 -5.92E-05 -2.44E-05 S12 -4.00E+00 0.00E+00 -2.31E-04 1.85E-05 Face No. D E F S3 -8.76E-08 2.78E-09 -5.18E-11 S4 8.03E-09 -2.54E-10 -1.54E-11 S11 -8.02E-07 1.12E-08 5.45E-10 S12 -4.67E-06 2.19E-07 -3.16E-09

[0133] 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 0.05mm, indicating that the optical lens can effectively correct field curvature; the distortion value is controlled within the range of -0.8% to 0, 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.

[0134] Example 5

[0135] 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.

[0136] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 5-1.

[0137] Table 5-1

[0138]

[0139] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 5-2.

[0140] Table 5-2

[0141] Face No. K A B C S3 -8.87E-01 0.00E+00 0.00E+00 -6.29E-07 S4 5.00E+01 0.00E+00 0.00E+00 -2.75E-06 S11 -6.74E+00 0.00E+00 2.12E-05 -2.42E-05 S12 -3.99E+00 0.00E+00 -2.66E-04 1.70E-05 Face No. D E F S3 -9.43E-08 2.60E-09 -5.06E-11 S4 -1.66E-09 -2.58E-10 -1.56E-11 S11 -1.05E-06 3.70E-09 9.18E-10 S12 -4.76E-06 2.16E-07 -2.91E-09

[0142] 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 -0.05mm to 0.05mm, indicating that the optical lens can effectively correct field curvature; the distortion value is controlled within the range of -1% to 0, 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.

[0143] Example 6

[0144] 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.

[0145] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 6-1.

[0146] Table 6-1

[0147]

[0148] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 6-2.

[0149] Table 6-2

[0150] Face No. K A B C S3 -8.27E-01 0.00E+00 0.00E+00 -4.79E-07 S4 5.00E+01 0.00E+00 0.00E+00 -2.62E-06 S11 -7.73E+00 0.00E+00 -1.56E-04 -2.59E-05 S12 -4.90E+00 0.00E+00 -3.54E-04 1.96E-05 Face No. D E F S3 -8.88E-08 2.74E-09 -5.05E-11 S4 8.55E-09 -2.32E-10 -1.65E-11 S11 -7.09E-07 1.58E-08 3.26E-10 S12 -4.54E-06 2.15E-07 -3.24E-09

[0151] 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 -0.05mm to 0.05mm, indicating that the optical lens can effectively correct field curvature; the distortion value is controlled within the range of -0.8% to 0, 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.

[0152] Example 7

[0153] 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.

[0154] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 7-1.

[0155] Table 7-1

[0156]

[0157] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 7-2.

[0158] Table 7-2

[0159]

[0160]

[0161] Figure 26 to Figure 28 The field curvature curve, the distortion curve and the modulation transfer function (MTF) curve of the embodiment 7 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 0~6%, 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.

[0162] Please refer to Table 8, which shows the optical characteristics corresponding to the optical lens provided in the above 7 embodiments respectively, 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.

[0163] Table 8

[0164]

[0165]

[0166] Table 8 (continued)

[0167] Parameters and conditional expressions Example 5 Example 6 Example 7 f (mm) 15.06 15.08 14.49 FOV (°) 35.00 35.00 35.00 EPD (mm) 9.41 9.43 9.06 TTL (mm) 31.78 32.36 32.99 FNO 1.60 1.60 1.60 IH (mm) 9.43 9.43 9.65 CRA (°) 19.04 19.01 18.96 BFL (mm) 2.32 2.32 2.25 TTL / f 2.11 2.15 2.28 (IH / 2) / (f x Tan(FOV / 2)) 0.99 0.99 1.06 IH / f 0.63 0.63 0.67 BFL / f 0.29 0.27 0.28 180° x TTL / (IH / 2) / (FOV / 2) 69.33 70.56 70.35 ∑CT / TTL 0.61 0.61 0.71 d1 / (IH / 2) / Tan(FOV / 2) 3.97 3.91 4.08 f1 / f -2.19 -2.10 -2.08 f2 / f 1.66 1.68 1.83 f3 / f 1.95 1.60 1.22 f4 / f 1.05 1.05 1.04 f5 / f -0.66 -0.58 -0.44 f6 / f 3.41 4.43 1.98 R3 / f 0.85 0.83 0.85 R5 / f 0.79 0.85 1.47 R10 / f 0.46 0.49 0.42 (R1-R2) / (R1+R2) -1.47 -1.36 -1.37 (R7-R8) / (R7+R8) -0.72 -0.83 -0.85 R1 / f -1.65 -1.53 -1.52 R2 / f 8.64 10.06 9.79 R7 / f 0.54 0.57 0.57 R8 / f 3.34 6.17 6.90

[0168] 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 15.08mm), 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.

[0169] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0170] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An optical lens, six pieces of lenses in total, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface; a second lens with positive refractive power, the object side surface of which is a convex surface; a third lens with positive refractive power, the object 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, and the image side surface of which is a concave surface; a fifth lens with negative refractive power, the image side surface of which is a concave surface; a sixth lens with positive refractive power; a radius of curvature R7 of the object side surface of the fourth lens and a radius of curvature R8 of the image side surface of the fourth lens satisfy: -0.95 < (R7-R8) / (R7+R8) < -0.6; an optical total length TTL of the optical lens, an image height IH corresponding to a maximum field of view of the optical lens, and a maximum field of view FOV of the optical lens satisfy: 45 < 180°×TTL / (IH / 2) / (FOV / 2) < 80; a radius of curvature R1 of the object side surface of the first lens and a radius of curvature R2 of the image side surface of the first lens satisfy: 1.2 < |(R1-R2) / (R1+R2)| < 17.

3.

2. The optical lens of claim 1, wherein, a radius of curvature R1 of the object side surface of the first lens and a radius of curvature R2 of the image side surface of the first lens satisfy: 1.34 ≤ |(R1-R2) / (R1+R2)| ≤ 15.

8.

3. The optical lens of claim 1, wherein, a radius of curvature R7 of the object side surface of the fourth lens and a radius of curvature R8 of the image side surface of the fourth lens satisfy: -0.89 ≤ (R7-R8) / (R7+R8) ≤ -0.

72.

4. The optical lens of claim 1, wherein, an optical total length TTL of the optical lens and an effective focal length f of the optical lens satisfy: 1.5 < TTL / f < 2.

5.

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

1.

6. The optical lens of claim 1, wherein, an optical total length TTL of the optical lens, an image height IH corresponding to a maximum field of view of the optical lens, and a maximum field of view FOV of the optical lens satisfy: 50.04 ≤ 180°×TTL / (IH / 2) / (FOV / 2) ≤ 71.

01.

7. The optical lens of claim 1, wherein, an effective focal length f1 of the first lens and an effective focal length f of the optical lens satisfy: -2.5 < f1 / f < -0.

7.

8. The optical lens of claim 1, wherein, an effective focal length f4 of the fourth lens and an effective focal length f of the optical lens satisfy: 0.7 < f4 / f < 1.

2.

9. The optical lens of claim 1, wherein, a radius of curvature R5 of the object side surface of the third lens and an effective focal length f of the optical lens satisfy: 0.6 < R5 / f < 7.

10. The optical lens of claim 1, wherein, a radius of curvature R10 of the image side surface of the fifth lens and an effective focal length f of the optical lens satisfy: 0.2 < R10 / f < 0.7.

Images