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 and the image side surface is a concave 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 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] This invention relates to the field of imaging lens technology, and in particular to an optical lens. Background Technology

[0002] As people's demands for driving experience continue to increase, automotive optical lenses are being used more and more in intelligent driving, and the status of automotive optical lenses in the automotive industry is constantly rising.

[0003] In automotive cameras, the forward-facing camera is a core component of ADAS (Advanced Driver Assistance Systems), primarily responsible for functions such as forward collision warning, lane departure warning, and pedestrian detection. Currently, due to the complex algorithms and chip processing involved, forward-facing cameras are typically much more expensive than other types of cameras, reflecting their crucial role in automotive camera systems. With the rapid development of advanced driver assistance systems, the requirements for forward-facing lenses are also increasing. Therefore, there is a need to develop an optical lens with high imaging quality. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide an optical lens that has the advantages of at least one of the following: long focal length, miniaturization, low cost, high resolution, and normal use in low light and harsh environments.

[0005] This invention provides an optical lens comprising six lenses, arranged sequentially along the optical axis from the object side to the imaging plane: a first lens with negative optical power, the object side of which is concave and the image side of which is concave; a second lens with positive optical power, the object side of which is convex; a third lens with positive optical power, the object side of which is convex and the image side of which is concave; a fourth lens with positive optical power, the object side of which is convex; a fifth lens with negative optical power, the image side of which is concave; and a sixth lens with positive optical power.

[0006] In some embodiments, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side satisfy: 1.2 < |(R1-R2) / (R1+R2)|.

[0007] In some implementations, the radius of curvature R5 of the object side of the third lens and the radius of curvature R6 of the image side satisfy: -0.9 < (R5-R6) / (R5+R6) < -0.2.

[0008] In some implementations, the total optical length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy the condition: 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 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: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80, where TTL is the total track 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: f1 / f < -1.

[0012] In some embodiments, the effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.5 < f3 / f.

[0013] In some embodiments, the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: 0.5 < R3 / f < 0.9.

[0014] 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 < 0.6.

[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 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 more readily appreciated 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 20MTF curve plot for the optical lens in Example 5 of the present application.

[0037] Figure 21 Structure schematic diagram for the optical lens of Example 6 of the present application.

[0038] Figure 22 Field curve plot for the optical lens of Example 6 of the present application.

[0039] Figure 23 F-Tan(Theta) distortion curve plot for the optical lens in Example 6 of the present application.

[0040] Figure 24 MTF curve plot for the optical lens in Example 6 of the present application.

[0041] Figure 25 Structure schematic diagram for the optical lens of Example 7 of the present application.

[0042] Figure 26 Field curve plot for the optical lens of Example 7 of the present application.

[0043] Figure 27 F-Tan(Theta) distortion curve plot for the optical lens in Example 7 of the present application.

[0044] Figure 28 MTF curve plot for the optical lens in Example 7 of the present application.

[0045] Figure 29 Structure schematic diagram for the optical lens of Example 8 of the present application.

[0046] Figure 30 Field curve plot for the optical lens of Example 8 of the present application.

[0047] Figure 31 F-Tan(Theta) distortion curve plot for the optical lens in Example 8 of the present application.

[0048] Figure 32 MTF curve plot for the optical lens in Example 8 of the present application. DETAILED DESCRIPTION

[0049] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is only a description of embodiments of the present application and is not intended in any way to limit 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.

[0050] It should be noted that the terms first, second, third, etc. in the present specification are used 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.

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

[0052] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

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

[0054] Unless otherwise defined, all terms used in this specification, including technical and scientific terms, 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.

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

[0056] The optical lens comprises six lenses, 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 optical centers of the lenses are located on the same line.

[0057] In some embodiments, the first lens is arranged to have a negative focal length, and is beneficial to diverging light rays. Under the same field of view angle condition, the light rays emitted from the image side of the first lens can make the subsequent optical system have a larger light ray acceptance surface, and reduce the front aperture.

[0058] In some embodiments, the second lens is arranged to have a positive focal length, and is beneficial to converging light rays. In combination with the first lens having a negative focal length, the total length of the optical lens can be reduced, and the converging effect of the light rays can further reduce the rear aperture. The object side of the second lens is a convex surface, which can converge the light rays passing through the first lens and reduce the height of the light rays, 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.

[0059] In some embodiments, the third lens is arranged to have a positive focal length, and is beneficial to receiving the light rays converged from the second lens, reduce the height of the light beam incident to the object side of the fourth lens, and reduce the aperture of the object side of the fourth lens. The object side of the third lens is a convex surface, and the image side is a concave surface, 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 to the direction of the optical axis after passing through the second side of the third lens, which is beneficial to reducing the rear aperture of the system.

[0060] In some embodiments, the fourth lens is arranged to have a positive focal length, and is beneficial to converging light rays. In combination with the fifth lens, the aberration of the optical lens can be effectively corrected, the imaging quality can be improved, and the optical performance such as distortion can be optimized. The object side of the fourth lens is a convex surface, which can suppress the angle of the edge field of view incident to the imaging surface, effectively transfer more light beams to the imaging surface, and improve the imaging quality.

[0061] In some embodiments, the fifth lens is configured to have a negative focal length, which is beneficial for diverging light rays, allowing the subsequent optical system to have a larger light acceptance, improving optical performance, and effectively correcting various aberrations caused by the front lens, thereby improving the imaging quality of the optical lens.

[0062] In some embodiments, the sixth lens is configured to have a positive focal length, which is beneficial for receiving light rays from the front end, improving resolution, and further, the fifth lens receives light rays compressed by the front end positive lens, reduces the angle of light rays, and meets the requirements of CRA; and can optimize spherical aberration and improve imaging quality.

[0063] In some embodiments, the diaphragm can be disposed 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 aberrations, which is beneficial to balance the structure of the entire optical system. In addition, when the diaphragm is located between the first lens and the second lens, the diaphragm aberration can be corrected, and the structure and focal length distribution of the front lens group and the rear lens group can be balanced.

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

[0065] In some embodiments, the effective focal length f of the optical lens satisfies: 13mm < f < 17mm. Satisfying the above range is beneficial for the optical lens to have a long focal length feature, which can ensure the telephoto effect of the optical lens, and the system has a large magnification, which has good imaging quality for the scene in a relatively far field of view.

[0066] 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 capture a target at a long distance.

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

[0068] In some embodiments, the incident angle of the chief ray of the maximum field angle of the optical lens on the image plane is CRA, and CRA 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, and improve the adaptation ability of the optical lens to the image sensor.

[0069] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy 1.5 < 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.

[0070] In some embodiments, the image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy 0.95 < (IH / 2) / (f x Tan(FOV / 2)) < 1.1. 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.

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

[0072] In some embodiments, the optical back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy 0.2 < BFL / f < 0.4. 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.

[0073] In some embodiments, the total optical length TTL of the optical lens, the image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy 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 miniaturization of the optical lens.

[0074] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis satisfy 0.5 < ∑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.

[0075] In some embodiments, the first lens has a half entrance pupil diameter d1, 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, and the following relationship is satisfied: 3 < d1 / (IH / 2) / Tan(FOV / 2) < 4.8. Satisfying the above range can make the front aperture small while satisfying the optical lens having a suitable field of view and image height, which is conducive to the miniaturization of the optical lens.

[0076] In some embodiments, the first lens has a focal length f1 and the optical lens has an effective focal length f, and the following relationship is satisfied: f1 / f < -1. Satisfying the above range can make a large range of light rays enter the optical lens to obtain more image information, and is conducive to controlling lens distortion and reducing field curvature to improve the geometric accuracy of the imaging surface. Preferably, -2.7 < f1 / f < -1.

[0077] In some embodiments, the second lens has a focal length f2 and the optical lens has an effective focal length f, and the following relationship is satisfied: 0.8 < f2 / f < 1.8. Satisfying the above range can reduce the light deflection angle while converging the light rays to make the light ray trend transition smoothly, and can balance various aberrations generated by the front lens to improve the imaging quality of the optical lens.

[0078] In some embodiments, the third lens has a focal length f3 and the optical lens has an effective focal length f, and the following relationship is satisfied: 1.5 < f3 / f. Satisfying the above range can reduce the light deflection angle to make the light ray trend transition smoothly, and can balance various aberrations generated by the front lens to improve the imaging quality of the optical lens. Preferably, 1.5 < f3 / f < 7.1.

[0079] In some embodiments, the fourth lens has a focal length f4 and the optical lens has an effective focal length f, and the following relationship is satisfied: 0.4 < f4 / f < 1.2. Satisfying the above range can converge and adjust the light rays exiting from the fourth lens to slow down the turning trend and convergence degree of the light rays to make the light rays transition smoothly, and can balance various aberrations generated by the front lens to improve the overall imaging quality of the optical lens.

[0080] In some embodiments, the fifth lens has a focal length f5 and the optical lens has an effective focal length f, and the following relationship is satisfied: -0.8 < f5 / f < -0.1. Satisfying the above range can increase the imaging area, and the fourth lens and the fifth lens can be matched to optimize the lens chromatic aberration and improve the imaging quality.

[0081] In some embodiments, the sixth lens has a focal length f6 and the optical lens has an effective focal length f, and the following relationship is satisfied: 1.2 < f6 / f. Satisfying the above range can optimize the spherical aberration to improve the imaging quality, and suppress the angle of the edge field of view incident on the imaging surface to effectively transmit more light beams to the imaging surface to improve the imaging quality. Preferably, 1.2 < f6 / f < 4.9.

[0082] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: 0.5 < R3 / f < 0.9. Satisfying the above range, the convex surface can be directed to the object side, converging the marginal field of view light, improving the imaging quality of the marginal field of view.

[0083] In some embodiments, the radius of curvature 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 < 0.9. Satisfying the above range, the convex surface can be directed to the object side, converging the marginal field of view light, improving the imaging quality of the marginal field of view.

[0084] 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: 0.2 < R10 / f < 0.6. Satisfying the above range, the concave surface can be directed to the image side, converging the marginal field of view angle light, improving the relative illumination of the optical lens.

[0085] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface satisfy: 1.2 < |(R1-R2) / (R1+R2)|. Satisfying the above range, it is beneficial for the light to smoothly transition to the rear, collecting more light into the lens, achieving small aperture and short total length while improving resolution capability. Preferably, 1.2 < |(R1-R2) / (R1+R2)| < 18.

[0086] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface satisfy: -0.9 < (R5-R6) / (R5+R6) < -0.2. Satisfying the above range, it is helpful to control the increase of the image height of the marginal field of view light beam, while reducing the off-axis aberration of the optical lens, and is beneficial to reduce the field curvature.

[0087] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: R1 / f < -0.75. 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. Preferably, -6.8 < R1 / f < -0.75.

[0088] In some embodiments, the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 1 < R2 / f. Satisfying the above range, the concave surface can be directed to the image side, playing a role of diverging light, which is beneficial to increase the imaging area of the lens and improve the imaging quality. Preferably, 1 < R2 / f < 9.5.

[0089] 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: 0.7 < R5 / f < 3.1. Satisfying the above range, the convex surface can be oriented towards the object side, the light rays emitted by the second lens can smoothly enter the third lens, more light rays can be collected, the detail quality of the imaging surface can be improved, the generation of aberration can be reduced, and the imaging quality can be improved.

[0090] In some embodiments, the radius of curvature R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: 2.3 < R6 / f. Satisfying the above range, the concave surface can be oriented towards the image side, the edge field of view light rays can be deflected towards the optical axis direction after passing through the second side surface of the third lens, and the system back aperture can be reduced. Preferably, 2.3 < R6 / f < 8.

[0091] As an embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens can be all-glass lenses or glass-plastic hybrid lenses, both of which can achieve good imaging effects. In the present application, in order to improve the imaging quality of the lens, glass lenses are used for each lens. Meanwhile, at least one of the object side surface or the image side surface of the second lens and the sixth lens is an aspheric surface. The aspheric 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 aspheric lens has better curvature radius characteristics and has the advantages of improving the distortion aberration and improving the astigmatism aberration.

[0092] In order to make the system have better optical performance, multiple aspheric lenses are used in the lens, and the shape of each aspheric surface of the optical lens satisfies the following equation:

[0093]

[0094] wherein z is the distance of the curved surface to the vertex of the curved surface in the optical axis direction, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients, respectively.

[0095] The present application is further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments only, and any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present application should be regarded as equivalent replacement modes, and are included in the protection scope of the present application.

[0096] Embodiment 1

[0097] Please refer to Figure 1 Figure 1 shows a structural schematic diagram of an optical lens provided in Embodiment 1 of the present application, which comprises, along the optical axis from the object side to the imaging surface S14, 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.

[0098] 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 concave 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 concave surface; the fourth lens L4 is a spherical lens with positive focal power, the object side S7 of the fourth lens is a concave surface, and the image side of the fourth lens is a convex surface; the fifth lens L5 is a spherical lens with negative focal power, the object side of the fifth lens is a concave surface, and the image side S9 of the fifth lens is a concave surface, and the fourth lens L4 and the fifth lens L5 form a cemented lens, and the cemented surface is S8; the sixth lens L6 is an aspherical lens with positive focal power, the object side S10 of the sixth lens is a convex surface, and the image side S11 of the sixth lens is a convex surface; the object side S12 and the image side S13 of the filter G1 are both flat surfaces.

[0099] Specifically, the design parameters of each lens of the optical lens provided in the embodiment are shown in Table 1-1.

[0100] Table 1-1

[0101]

[0102] The surface type coefficients of each aspherical surface of the optical lens in the embodiment are shown in Table 1-2.

[0103] Table 1-2

[0104] Face number K A B C S3 -3.26E-01 0.00E+00 -4.86E-05 1.62E-06 S4 5.00E+01 0.00E+00 2.15E-04 -1.23E-06 S10 -2.70E+07 0.00E+00 -1.18E-03 -6.08E-05 S11 -1.37E+01 0.00E+00 -6.95E-04 -1.84E-05 Face number D E F S3 -6.60E-08 1.60E-09 -1.09E-11 S4 2.61E-07 -7.80E-09 1.34E-10 S10 3.98E-07 -1.56E-07 -4.49E-09 S11 -8.26E-07 4.36E-08 -5.00E-10

[0105] Figure 2 The field curvature curve of 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-0.2mm-0.05mm, which indicates that the optical lens can well correct the field curvature.

[0106] Figure 3The 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: °). It can be seen from the figure that the distortion value is controlled in the range of 0-4.5%, which indicates that the optical lens has small distortion, the image compression in the edge angle area is relatively flat, and the clarity of the expanded image is effectively improved.

[0107] 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. It can be seen from the figure that the MTF value of the embodiment is above 0.2 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0108] Embodiment 2

[0109] 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 aspherical surface coefficient and other parameters are different.

[0110] Specifically, the design parameters of each lens of the optical lens provided by the embodiment are shown in Table 2-1.

[0111] Table 2-1

[0112]

[0113]

[0114] The surface type coefficients of each aspherical surface of the optical lens in the embodiment are shown in Table 2-2.

[0115] Table 2-2

[0116] Face number K A B C S3 1.21E+00 0.00E+00 -1.79E-04 2.01E-06 S4 -1.82E+00 0.00E+00 1.77E-04 2.27E-06 S10 -9.81E+39 0.00E+00 1.85E-03 -3.06E-05 S11 -2.91E+01 0.00E+00 1.55E-03 -3.50E-05 Face number D E F S3 -1.82E-07 5.47E-09 -7.98E-11 S4 -2.81E-08 2.15E-09 -5.77E-12 S10 6.80E-06 -4.17E-07 1.09E-08 S11 9.30E-06 -5.97E-07 1.56E-08

[0117] Figure 6 to Figure 8The 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~0.1mm, 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 0.3 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 low frequency and high frequency conditions.

[0118] Embodiment 3

[0119] 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.

[0120] Specifically, the design parameters of each lens of the optical lens provided by the embodiment are shown in Table 3-1.

[0121] Table 3-1

[0122]

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

[0124] Table 3-2

[0125] Face number K A B C S3 1.43E+00 0.00E+00 -2.58E-04 7.82E-07 S4 -6.39E-01 0.00E+00 1.16E-04 1.03E-06 S10 -8.71E+03 0.00E+00 -2.95E-04 -6.55E-06 S11 -8.00E+01 0.00E+00 -2.35E-04 -4.36E-06 Face number D E F S3 -1.55E-07 3.88E-09 -6.34E-11 S4 -2.86E-08 1.26E-09 -1.06E-11 S10 -2.89E-06 1.10E-07 -5.87E-09 S11 -1.35E-06 2.46E-09 7.32E-10

[0126] 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 0~4%, 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 0~120lp / 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 low frequency and high frequency conditions.

[0127] Embodiment 4

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

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

[0130] Table 4-1

[0131]

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

[0133] Table 4-2

[0134] Face number K A B C S3 8.51E-01 0.00E+00 -3.25E-04 -3.68E-06 S4 -6.84E-01 0.00E+00 1.07E-04 -7.05E-07 S11 -4.05E+38 0.00E+00 -1.07E-03 -9.69E-05 S12 4.80E+00 0.00E+00 -4.66E-04 -1.10E-04 Face number D E F S3 -6.31E-08 -3.89E-10 -5.70E-11 S4 1.02E-07 -2.77E-09 4.70E-11 S11 -2.83E-06 5.04E-07 -4.45E-08 S12 5.81E-06 -3.41E-07 6.10E-09

[0135] 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 -0.05 mm-0.1 mm, which indicates that the optical lens can well correct the field curvature; the distortion value is controlled within 0-2%, which indicates that the optical lens has small distortion; the MTF value of the optical lens is above 0.25 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 the case of low frequency and high frequency.

[0136] Embodiment 5

[0137] Please refer to Figure 17 Figure 5 shows a structural schematic diagram of an optical lens according to an embodiment of the present application, and the optical lens of this embodiment is substantially the same as the optical lens of the above-mentioned embodiment 1, except that the radius of curvature of each lens surface, the thickness of each lens, the aspheric surface coefficients of each lens, and the like are different.

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

[0139] Table 5-1

[0140]

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

[0142] Table 5-2

[0143] Face number K A B C S3 -9.75E-01 0.00E+00 0.00E+00 3.31E-07 S4 5.00E+01 0.00E+00 0.00E+00 -2.65E-06 S11 1.14E+00 0.00E+00 -9.08E-04 -5.34E-05 S12 8.42E-02 0.00E+00 -5.30E-04 -2.88E-05 Face number D E F S3 -9.72E-08 2.34E-09 -3.92E-11 S4 3.87E-08 -1.17E-09 -4.13E-12 S11 3.24E-06 -2.14E-07 4.75E-09 S12 -1.85E-07 9.76E-09 3.70E-10

[0144] Figure 17 to Figure 20 The field curvature curve, the distortion curve and the modulation transfer function (MTF) curve of the optical lens of the embodiment 5 are shown respectively. As shown in the figures, the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.1mm-0.05mm, which indicates that the optical lens can correct the field curvature well; the distortion value is controlled within-1.2%-0, 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.

[0145] Embodiment 6

[0146] Please refer to Figure 21 , which is a structural schematic diagram of the optical lens provided by the embodiment 6 of the present application. The optical lens of the present 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, the aspheric surface coefficient and other parameters are different.

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

[0148] Table 6-1

[0149]

[0150] The aspheric surface coefficient of each aspheric surface of the optical lens in the present embodiment is shown in Table 6-2.

[0151] Table 6-2

[0152]

[0153]

[0154] Figure 22 to Figure 24 The field curvature curve, the distortion curve and the modulation transfer function (MTF) curve of the optical lens of the embodiment 6 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-0.8%-0, 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.

[0155] Embodiment 7

[0156] 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.

[0157] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 7-1.

[0158] Table 7-1

[0159]

[0160] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 7-2.

[0161] Table 7-2

[0162]

[0163]

[0164] Figure 26 to Figure 28 The field curvature curve, distortion curve, and modulation transfer function (MTF) curve of Example 7 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.

[0165] Example 8

[0166] Please see Figure 29 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 8 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.

[0167] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 8-1.

[0168] Table 8-1

[0169]

[0170] The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in Table 8-2.

[0171] Table 8-2

[0172] Face number K A B C S3 -4.28E-01 0.00E+00 0.00E+00 -1.66E-06 S4 5.01E+01 0.00E+00 0.00E+00 5.76E-06 S11 5.66E+01 0.00E+00 -1.77E-03 2.43E-05 S12 -8.04E+01 0.00E+00 -2.22E-03 1.08E-04 Face number D E F S3 1.19E-07 -3.98E-09 4.51E-11 S4 -5.58E-07 1.96E-08 -3.16E-10 S11 -2.09E-05 1.71E-06 -8.42E-08 S12 -8.75E-06 3.32E-07 -4.85E-09

[0173] Figure 30 to Figure 32 The field curvature curve, the distortion curve and the modulation transfer function (MTF) curve of the optical lens of Example 8 are shown in FIGS. 8-2, 8-3 and 8-4, 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~0.1mm, 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 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.

[0174] Referring to Table 9, the optical properties corresponding to the optical lenses provided in the above eight examples 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 CRA, the optical back focal length BFL, and the numerical values corresponding to each conditional expression in each example.

[0175] Table 9

[0176]

[0177]

[0178] Table 9 (continued)

[0179]

[0180]

[0181] 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 15.09mm), 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.

[0182] 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.

[0183] 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, there are sequentially arranged: 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, and the image side surface of which is a concave 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 image side surface of which is a concave surface; a sixth lens with positive refractive power; 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)|; an image height IH corresponding to a maximum field angle of the optical lens, an effective focal length f of the optical lens, and a maximum field angle FOV of the optical lens satisfy: 0.95 < (IH / 2) / (f*Tan(FOV / 2)) < 1.

1.

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: 1.2 < |(R1-R2) / (R1+R2)| < 18.

3. The optical lens of claim 1, wherein, a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R6 of the image side surface of the third lens satisfy: -0.9 < (R5-R6) / (R5+R6) < -0.

2.

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 angle of the optical lens, an effective focal length f of the optical lens, and a maximum field angle FOV of the optical lens satisfy: 0.99 ≤ (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 angle of the optical lens, and a maximum field angle FOV of the optical lens satisfy: 45 < 180°*TTL / (IH / 2) / (FOV / 2) < 80.

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: -2.7 < f1 / f < -1.

8. The optical lens of claim 1, wherein, an effective focal length f3 of the third lens and an effective focal length f of the optical lens satisfy: 1.5 < f3 / f < 7.

1.

9. The optical lens of claim 1, wherein, a radius of curvature R3 of the object side surface of the second lens and an effective focal length f of the optical lens satisfy: 0.5 < R3 / f < 0.

9.

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 < 0.6.

Images