Optical lens and electronic equipment

Abstract

The invention provides an optical lens and electronic equipment. The optical lens is composed of six lenses. The optical lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the first side to the second side along the optical axis. The optical lens meets the condition that T56 / R10 is larger than or equal to-0.42 and smaller than or equal to-0.25, T56 is the air interval between the fifth lens and the sixth lens on the optical axis, and R10 is the curvature radius of the second side face of the fifth lens. According to the invention, the problems of large field angle, miniaturization, low cost, small CRA, high imaging quality and high collimation performance of an optical lens in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an optical lens and an electronic device. Background Art

[0002] In recent years, with the development of technology, the demand for optical lenses in daily life has been increasing, and optical lenses have been applied to more and more scenarios. For example, in the automotive autonomous driving assistance system, the emerging autonomous driving technology has extremely high requirements for the vehicle's ability to perceive the surrounding environment. LiDAR is a key device for detecting information around the vehicle, and the optical lens mounted on the LiDAR is a key component for the ability to perceive the surrounding environment.

[0003] With the rapid development of the automotive autonomous driving assistance system, the optical lens mounted on the LiDAR is developing towards miniaturization and high performance. At the same time, with the increasing safety requirements of the automotive driving assistance system, in order to obtain more accurate signal detection, it is usually required that the optical lens has high collimation performance to ensure the concentration of the laser emission energy. Currently, optical lenses usually adopt the scheme of increasing the aspherical mirror surface to ensure the collimation performance. However, the volume of such lenses is relatively large, the cost is high, and the chief ray angle (CRA) is large, which is not conducive to realizing the collimation emission of the laser.

[0004] That is to say, there is a problem in the prior art that it is difficult to balance a large field of view angle, miniaturization, low cost, small CRA, high imaging quality, and high collimation performance in an optical lens. Summary of the Invention

[0005] The main object of the present invention is to provide an optical lens and an electronic device to solve the problem in the prior art that it is difficult to balance a large field of view angle, miniaturization, low cost, small CRA, high imaging quality, and high collimation performance in an optical lens.

[0006] To achieve the above object, according to one aspect of the present invention, an optical lens is provided. The optical lens is composed of six lenses. Along the optical axis, the optical lens sequentially includes from the first side to the second side: a first lens having a negative focal power, the first side surface of the first lens being convex and the second side surface being concave; a second lens having a negative focal power, the first side surface of the second lens being convex and the second side surface being concave; a third lens having a negative focal power, the first side surface of the third lens being convex and the second side surface being concave; a fourth lens having a positive focal power, the first side surface of the fourth lens being convex and the second side surface being convex; a fifth lens having a positive focal power, the second side surface of the fifth lens being convex; a sixth lens having a positive focal power, the first side surface of the sixth lens being convex. The optical lens satisfies: -0.42 ≤ T56 / R10 ≤ -0.25, where T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and R10 is the curvature radius of the second side surface of the fifth lens.

[0007] Further, the first side surface of the fifth lens is concave.

[0008] Further, the first side surface of the fifth lens is convex.

[0009] Further, the first side surface of the fifth lens is flat.

[0010] Further, the second side surface of the sixth lens is concave.

[0011] Further, the second side surface of the sixth lens is convex.

[0012] Further, the second side surface of the sixth lens is flat.

[0013] Further, the third lens and the fourth lens form a cemented lens.

[0014] Further, the optical lens satisfies: 0.34 ≤ F / H ≤ 0.42, where F is the effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens.

[0015] Further, the optical lens satisfies: -12 ≤ F3 / F ≤ -5, where F3 is the effective focal length of the third lens, and F is the effective focal length of the optical lens.

[0016] Further, the optical lens satisfies: 0.8 ≤ (CT3 + CT4) / F4 ≤ 1.3, where CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and F4 is the effective focal length of the fourth lens.

[0017] Further, the optical lens satisfies: 0.8 ≤ F1 / F2 ≤ 1.4, where F1 is the effective focal length of the first lens and F2 is the effective focal length of the second lens.

[0018] Further, the optical lens satisfies: -3.5 ≤ F1 / F ≤ -2.3, where F1 is the effective focal length of the first lens and F is the effective focal length of the optical lens.

[0019] Further, the optical lens satisfies: -3.5 ≤ F2 / F ≤ -2.3, where F2 is the effective focal length of the second lens and F is the effective focal length of the optical lens.

[0020] Further, the optical lens satisfies: 1.8 ≤ F4 / F ≤ 2.8, where F4 is the effective focal length of the fourth lens and F is the effective focal length of the optical lens.

[0021] Further, the optical lens satisfies: 2.2 ≤ F34 / F ≤ 5.5, where F34 is the combined focal length of the third lens and the fourth lens, and F is the effective focal length of the optical lens.

[0022] Further, the optical lens satisfies: 3 ≤ F5 / F ≤ 10, where F5 is the effective focal length of the fifth lens and F is the effective focal length of the optical lens.

[0023] Further, the optical lens satisfies: 3.8 ≤ F6 / F ≤ 7, where F6 is the effective focal length of the sixth lens and F is the effective focal length of the optical lens.

[0024] Further, the optical lens satisfies: 2 ≤ F6 / T56 ≤ 4.8, where F6 is the effective focal length of the sixth lens and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0025] Further, the optical lens satisfies: 0.18 ≤ d34 / F5 ≤ 0.65, where d34 is the distance on the optical axis between the first side surface of the third lens and the second side surface of the fourth lens, and F5 is the effective focal length of the fifth lens.

[0026] Further, the optical lens satisfies: 3 ≤ d34 / T45 ≤ 100, where d34 is the distance on the optical axis between the first side surface of the third lens and the second side surface of the fourth lens, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0027] Furthermore, the optical lens satisfies at least one of the following relational expressions: 10 ≤ TTL / F ≤ 12, 0.02 ≤ TTL / H / FOV ≤ 0.03, 1.7 ≤ TTL / DMAX ≤ 2.2, 0.46 ≤ (F×θ) / D ≤ 0.57, 0.01 ≤ D / H / FOV ≤ 0.015, 0.9 ≤ D / H / F ≤ 1.1, 0.1 ≤ BFL / TTL ≤ 0.18, 0.13 ≤ F / ENPD / D ≤ 0.18, and 0.09 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 0.12; where TTL is the overall optical length of the optical lens, F is the effective focal length of the optical lens, FOV is the maximum field of view angle of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, DMAX is the maximum aperture of the optical lens, θ is the radian value corresponding to the maximum field of view angle of the optical lens, D is the aperture corresponding to the maximum field of view angle of the optical lens on the first side of the first lens, BFL is the back focal length of the optical lens, and ENPD is the entrance pupil diameter of the optical lens.

[0028] Furthermore, the optical lens satisfies at least one of the following relational expressions: -1.8 ≤ R8 / R7 ≤ -0.8, 0.65 ≤ F5 / F6 ≤ 1.85, -7.8 ≤ R10 / F ≤ -3, 3.3 ≤ R1 / R2 ≤ 5.5, -0.25 ≤ SAG10 / (D10 / 2) ≤ -0.05, 0.14 ≤ SAG11 / (D11 / 2) ≤ 0.41, 0 ≤ TAN(CRA)×BFL ≤ 0.2, -1.6 ≤ R5 / F2 ≤ -0.75, and 4 ≤ d34 / T45 ≤ 74; where R1 is the radius of curvature of the first side of the first lens, R2 is the radius of curvature of the second side of the first lens, R5 is the radius of curvature of the first side of the third lens, R7 is the radius of curvature of the first side of the fourth lens, R8 is the radius of curvature of the second side of the fourth lens, R10 is the radius of curvature of the second side of the fifth lens, F is the effective focal length of the optical lens, F2 is the effective focal length of the second lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, BFL is the back focal length of the optical lens, SAG10 is the sag of the second side of the fifth lens, SAG11 is the sag of the first side of the sixth lens, D10 is the aperture corresponding to the maximum field of view angle of the optical lens on the second side of the fifth lens, D11 is the aperture corresponding to the maximum field of view angle of the optical lens on the first side of the sixth lens, CRA is the incident angle of the chief ray of the maximum field of view of the optical lens on the imaging surface, d34 is the distance between the first side of the third lens and the second side of the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0029] Further, the optical lens satisfies at least one of the following relationships: 10.6 ≤ TTL / F ≤ 11.5, 0.023 ≤ TTL / H / FOV ≤ 0.026, 1.8 ≤ TTL / DMAX ≤ 2.1, 0.49 ≤ (F×θ) / D ≤ 0.55, 0.012 ≤ D / H / FOV ≤ 0.014, 0.94 ≤ D / H / F ≤ 1.05, 0.12 ≤ BFL / TTL ≤ 0.17, 0.35 ≤ F / H ≤ 0.4, 0.14 ≤ F / ENPD / D ≤ 0.17, 0.1 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 0.11, -0.4 ≤ T56 / R10 ≤ -0.28, -11 ≤ F3 / F ≤ -7, -1.55 ≤ R8 / R7 ≤ -0.95, 0.9 ≤ (CT3 + CT4) / F4 ≤ 1.2, 0.9 ≤ F1 / F2 ≤ 1.3, -3.3 ≤ F1 / F ≤ -2.5, -3.3 ≤ F2 / F ≤ -2.5, 2 ≤ F4 / F ≤ 2.6, 3 ≤ F34 / F ≤ 5, 4.2 ≤ F5 / F ≤ 8.5, 4.5 ≤ F6 / F ≤ 6.2, 0.9 ≤ F5 / F6 ≤ 1.7, 2.4 ≤ F6 / T56 ≤ 4.1, -7 ≤ R10 / F ≤ -3.5, 3.8 ≤ R1 / R2 ≤ 5, -0.21 ≤ SAG10 / (D10 / 2) ≤ -0.09, 0.19 ≤ SAG11 / (D11 / 2) ≤ 0.36, 0.01 ≤ TAN(CRA)×BFL ≤ 0.16, 0.25 ≤ d34 / F5 ≤ 0.54, 5 ≤ d34 / T45 ≤ 64 and -1.4 ≤ R5 / F2 ≤ -0.9; wherein, FOV is the maximum field of view angle of the optical lens, θ is the radian value corresponding to the maximum field of view angle of the optical lens, CRA is the incident angle of the chief ray of the maximum field of view of the optical lens on the imaging surface, F is the effective focal length of the optical lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, F34 is the combined focal length of the third lens and the fourth lens, BFL is the back focal length of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, TTL is the overall optical length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, DMAX is the maximum clear aperture of the optical lens, D is the clear aperture corresponding to the maximum field of view angle of the optical lens on the first side surface of the first lens, D10 is the clear aperture corresponding to the maximum field of view angle of the optical lens on the second side surface of the fifth lens, D11 is the clear aperture corresponding to the maximum field of view angle of the optical lens on the first side surface of the sixth lens, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, R5 is the radius of curvature of the first side surface of the third lens, R7 is the radius of curvature of the first side surface of the fourth lens, R8 is the radius of curvature of the second side surface of the fourth lens, R10 is the radius of curvature of the second side surface of the fifth lens, CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, SAG10 is the sagitta of the second side surface of the fifth lens, SAG11 is the sagitta of the first side surface of the sixth lens, d34 is the distance between the first side surface of the third lens and the second side surface of the fourth lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0030] According to another aspect of the present invention, there is provided an electronic device, including the above optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0031] The present application provides a six-piece optical lens. The first lens, the second lens, and the third lens are set to have negative optical power and are convex-concave in shape, which can collect light at large angles, ensure the light transmission amount, and adjust the light trend to improve the imaging performance of the peripheral field of view. The fourth lens is set to have positive optical power, and both the first side and the second side are convex surfaces, which can cooperate with the first three lenses with negative optical power to correct aberrations. The optical power of the fifth lens is set to be positive, and the second side is convex, which can further correct aberrations and at the same time compress the front beam to ensure the small aperture of the sixth lens, which is beneficial to achieving a small CRA. The optical power of the sixth lens is set to be positive, and the first side is convex, which further converges the light and helps to achieve a small CRA. At the same time, T56 / R10 is constrained within the range of -0.42 to -0.25, so that the second side of the fifth lens is more convex, and the front light is quickly converged and adjusted through the second side of the fifth lens. With the relatively large air gap between the fifth lens and the sixth lens, it is ensured that the intersection height position of the chief ray of each field of view on the first side of the sixth lens is close to the corresponding image height. Maintaining a relatively large air gap can make the chief rays of each field of view nearly parallel to the optical axis, thereby ensuring a high reception efficiency and imaging quality of the imaging surface, and finally achieving a wide-angle field of view, a small CRA, and a high imaging quality of the optical lens. Especially for an optical lens applied to lidar emission, a high emission collimation performance can be achieved, so that the collimation degree of the optical lens can be less than 0.4°, that is, the average value of the angles by which all the emitted light rays deviate from the optical axis direction is less than 0.4°. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figures 1 to 14 Cross-sectional views of the optical lenses of Embodiment 1 to Embodiment 14 of the present invention are respectively shown;

[0034] Figures 15 to 28 MTF curves of the optical lenses of Embodiment 1 to Embodiment 14 of the present invention are respectively shown;

[0035] Figure 29 A light transmission diagram of the optical lens of Comparative Example 1 is shown;

[0036] Figure 30 An MTF curve of the optical lens of Comparative Example 1 is shown.

[0037] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0038] STO, diaphragm; L1, the first lens; S1, the first side surface of the first lens; S2, the second side surface of the first lens; L2, the second lens; S3, the first side surface of the second lens; S4, the second side surface of the second lens; L3, the third lens; S5, the first side surface of the third lens; S6, the second side surface of the third lens; L4, the fourth lens; S7, the first side surface of the fourth lens; S8, the second side surface of the fourth lens; L5, the fifth lens; S9, the first side surface of the fifth lens; S10, the second side surface of the fifth lens; L6, the sixth lens; S11, the first side surface of the sixth lens; S12, the second side surface of the sixth lens; IMA, imaging surface. Detailed implementation manners

[0039] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0040] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0041] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravitational directions of the components themselves; similarly, for the sake of easy understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components themselves, but the above orientation terms do not limit the present invention.

[0042] It should be noted that in this specification, the expressions of the first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0043] In the drawings, for the sake of convenience of illustration, the thickness, dimensions and shapes of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0044] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closer to the object side is called the first side of the lens, and the surface of each lens closer to the image side is called the second side of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, and the positive or negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge whether it is convex or concave. For the first side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the second side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0045] In an exemplary embodiment, the optical lens provided by the present application can be used as a light receiving lens or a light emitting lens, where: A light receiving lens is usually used to collect light rays from the object-side space, and the collected light rays are used to form detection information, including but not limited to imaging, laser point cloud, etc.; A light emitting lens is usually used to transmit the light rays from the light emitting element to the object-side space. According to the function of the light rays, the light rays transmitted to the object-side space can be divided into projection light rays for forming a projection image or detection light rays for detecting target object information, etc.

[0046] It can be understood that when the optical lens provided by the present application is used as a light receiving lens such as a camera lens, a lidar receiving end lens, a microscope lens, or a telescope lens, the "first side" involved in this text can refer to the object side, and the "second side" can refer to the image side (such as the side close to the photoelectric sensor or the retina), that is, the light rays from the object can be imaged on the image side. For example, it is used for camera lenses of devices such as vehicle-mounted cameras, infrared cameras, drone cameras, night vision cameras, and security surveillance cameras. When the optical lens provided by the present application is used as a projection lens or a lidar transmitting end lens, the "first side" involved in this text can refer to the object side, and the "second side" can refer to the light source side.

[0047] In some possible embodiments, the optical lens provided by the present application can also undertake both the light receiving function and the light emitting function at the same time. For example, the optical lens provided by the present application is used in a lidar system with a shared light emitting and receiving optical path, and the optical lens undertakes the functions of emitting laser and receiving radar echo beams at the same time. Another example is that the optical lens provided by the present application is used in a system integrating optical communication and radar, and the optical lens undertakes the functions of emitting modulated optical signals and receiving radar echo beams at the same time.

[0048] To solve the problem in the prior art that it is difficult to balance a large field of view angle, miniaturization, low cost, small CRA, high imaging quality, and high collimation performance in an optical lens, the present invention provides an optical lens and an electronic device.

[0049] In some alternative embodiments, refer to Figures 1 to 28 , the optical lens includes six lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. These six lenses are arranged in sequence along the optical axis from the first side to the second side.

[0050] In some alternative embodiments, the first lens has a negative optical power. The first side of the first lens is convex, and the second side of the first lens is concave. The first lens in the optical lens is closest to the first side. Setting it to have a negative optical power and setting the first side of the first lens to be convex is beneficial for converging the light beam, reducing the diameter of the received light beam, thereby reducing the size of the subsequent lenses, and ultimately facilitating the miniaturization of the optical lens and reducing the manufacturing cost. At the same time, the second side of the first lens is designed to be concave, making the overall shape of the first lens a meniscus with the concave side facing the second side. This can make the light enter the subsequent optical system smoothly, thereby slowing down the trend of the marginal light rays, being beneficial for reducing the incident angle of the chief rays in each field of view, and improving the imaging quality of the optical lens.

[0051] In some alternative embodiments, the second lens has a negative optical power. The first side of the second lens is convex, and the second side of the second lens is concave. The second lens having a negative optical power and the first side of the second lens being convex enables the second lens to slightly converge the light beam diffused by the first lens, adjust the trend of the light rays, and also helps to reduce the aperture of the subsequent third lens to sixth lens, thereby achieving low cost. At the same time, the second side of the second lens is concave, having the same shape as the first lens, making both the first lens and the second lens large-aperture lenses, which is then beneficial for the light collection of the wide-angle field of view, thereby adjusting the trend of the marginal light beam and ensuring that the optical lens has a large field of view angle.

[0052] In some alternative embodiments, the third lens has a negative optical power. The first side of the third lens is convex, and the second side of the third lens is concave. Setting the third lens to have a negative optical power and the first side to be convex can slightly converge the light beam that has been diffused by the front first lens and second lens, adjust the trend of the light rays to be slightly gentle, thereby alleviating the resolution pressure on the second side of the third lens and the subsequent fourth lens to sixth lens for the marginal field of view. The second side of the third lens is set to be concave to further adjust and expand the light beam, enabling the light beams in each field of view to enter the subsequent fourth lens to sixth lens in a slightly expanded state, ensuring high imaging quality for the marginal field of view. Specifically, when the optical lens is applied to the laser radar transmitting end, the third lens can provide high large-field-of-view angle collimation performance.

[0053] In some alternative embodiments, the fourth lens has a positive optical power. The first side of the fourth lens is convex, and the second side of the fourth lens is convex. Setting the fourth lens to have a positive optical power, and both the first side and the second side of the fourth lens being convex, compensates for the optical power with the first three lenses having negative optical powers, achieving an equilibrium of optical power. The design of the first lens, the second lens, and the third lens having negative optical powers is beneficial for expanding the field of view angle of the optical lens. Moreover, since both the first side and the second side of the fourth lens are convex, the light beams diffused by the first three lenses with negative optical powers are converged, initiating the converging imaging process of the optical lens.

[0054] In some alternative embodiments, the third lens and the fourth lens are cemented to form a cemented lens. The combination of the positive and negative optical powers of the fourth lens and the third lens can smoothly transition the light rays transmitted from the front to the rear optical system, enabling full correction of various aberrations in the optical lens. In particular, it has a good adjustment effect on the spherical aberration of the central field of view and the coma aberration of the large field of view, which is beneficial for improving the imaging quality of the optical lens. As an intermediate transition, the cemented lens can balance the distribution of the front group optical power, prevent the optical lens from being overly elongated, is conducive to achieving a more compact axial total length, conforms to the industry trend of the lidar module pursuing miniaturization, and is beneficial for achieving excellent performance of large field of view emission and high collimation emission.

[0055] In some alternative embodiments, the fifth lens has a positive optical power. The first side of the fifth lens is concave, and the second side of the fifth lens is convex. Setting the fifth lens to have a positive optical power and the first side of the fifth lens being concave can smooth the light ray trend, which is beneficial for correcting the aberration of the edge field of view and thus improving the imaging performance of the optical lens. At the same time, the convex second side of the fifth lens can compress the front light beam, ensuring that the aperture of the sixth lens is smaller, and making the intersection height position of the chief ray of each field of view with the first side of the sixth lens close to the corresponding image height, which is beneficial for achieving a small CRA. Optionally, for an optical lens applied to lidar emission, the above design can significantly improve the emission collimation performance.

[0056] In some alternative embodiments, the fifth lens has a positive optical power. The first side of the fifth lens is convex, and the second side of the fifth lens is convex. Setting the fifth lens to have a positive optical power and cooperating with the fourth lens can perform a second converging adjustment on the light beam, reducing the resolution pressure of the fourth lens. At the same time, both sides of the fifth lens are convex, which is beneficial for gently converging and collecting the front light beam, improving the imaging quality of the optical lens, and reducing the aperture of the rear sixth lens, thereby achieving miniaturization. Optionally, for an optical lens applied to lidar emission, the above design can achieve the development trend of high-quality collimation performance and miniaturization.

[0057] In some alternative embodiments, the fifth lens has a positive optical power. The first side of the fifth lens is a flat surface, and the second side of the fifth lens is a convex surface. By setting the fifth lens to have a positive optical power and the first side of the fifth lens to be a flat surface, while smoothing the light path, the processability of the fifth lens is improved and the assembly difficulty is reduced. The second side of the fifth lens is a convex surface, which can compress the front beam, thereby ensuring that the aperture of the subsequent sixth lens is smaller and guaranteeing the miniaturization of the optical lens.

[0058] In some alternative embodiments, the sixth lens has a positive optical power. The first side of the sixth lens is a convex surface, and the second side of the sixth lens is a concave surface. By setting the sixth lens to have a positive optical power and the first side to be a convex surface, it cooperates with the front fourth and fifth lenses to perform a third effective convergence and focusing on the already converged beam, and then transmits the beam to the second side of the sixth lens for final image resolution. The second side of the sixth lens is a concave surface. At this time, the shape of the sixth lens is a meniscus facing the second side, which can effectively ease the light path after passing through the fourth and fifth lenses, contributing to achieving a small CRA and high imaging quality of the optical lens.

[0059] In some alternative embodiments, the sixth lens has a positive optical power. The first side of the sixth lens is a convex surface, and the second side of the sixth lens is a convex surface. By setting the sixth lens to have a positive optical power and both sides to be convex surfaces, the sixth lens has a strong positive refractive power, thereby effectively converging the beam to the imaging surface. Since the effective focal length of the sixth lens is relatively small, it forms a good complement with the third, fourth, and fifth lenses in the front transition lens group. Therefore, the sixth lens performs the final aberration correction to ensure high imaging quality of the optical lens.

[0060] In some alternative embodiments, the sixth lens has a positive optical power. The first side of the sixth lens is a convex surface, and the second side of the sixth lens is a flat surface. By setting the sixth lens to have a positive optical power and the first side to be a convex surface, it cooperates with the front fourth and fifth lenses to further converge the beam and transmit it to the second side of the sixth lens for final image resolution. The second side of the sixth lens is a flat surface, which helps to smooth the light path and at the same time reduces the sensitivity of the sixth lens to ensure imaging quality.

[0061] In some alternative embodiments, the optical lens satisfies: -0.42 ≤ T56 / R10 ≤ -0.25, where T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and R10 is the radius of curvature of the second surface of the fifth lens. By restricting -0.42 ≤ T56 / R10 ≤ -0.25, the second surface of the fifth lens is made relatively convex, and the light rays in the front are quickly converged and adjusted through the second surface of the fifth lens. Together with the relatively large air gap between the fifth lens and the sixth lens, it is ensured that the intersection height position of the chief ray of each field of view on the first surface of the sixth lens is close to the corresponding image height. Maintaining a relatively large air gap can make the chief rays of each field of view nearly parallel to the optical axis, thereby ensuring a high reception efficiency and imaging quality on the imaging surface while restricting the volume of the optical lens. Finally, a wide field of view, a small CRA, and a high imaging quality of the optical lens are achieved, such that the collimation degree of the optical lens can be less than 0.4°, that is, the average value of the angles by which all the outgoing light rays deviate from the optical axis direction is less than 0.4°. In particular, for an optical lens applied to lidar emission, a high emission collimation performance can be achieved. Preferably, the optical lens can further satisfy -0.4 ≤ T56 / R10 ≤ -0.28 to further achieve a wide field of view, a small CRA, and a high imaging quality of the optical lens. More preferably, the optical lens can further satisfy -0.3899 ≤ T56 / R10 ≤ -0.2896 to improve the imaging performance of the optical lens.

[0062] Optionally, the first lens and the second lens of the optical lens form a wide-angle converging lens group, the third lens and the fourth lens form a transition lens group, and the fifth lens and the sixth lens serve as an imaging lens group.

[0063] In some alternative embodiments, the optical lens further has a diaphragm, and the diaphragm is located between the second lens and the third lens. Arranging the diaphragm between the second lens and the third lens is beneficial for effectively converging the light rays entering the optical lens, thereby reducing the lens aperture at the rear end of the optical lens and lowering the assembly sensitivity of the optical lens.

[0064] In some alternative embodiments, the optical lens satisfies: 0.34 ≤ F / H ≤ 0.42, where F is the effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. By restricting 0.34 ≤ F / H ≤ 0.42, the effective focal length and the image height of the optical lens are controlled within a certain range, which is beneficial for improving the imaging quality of the optical lens. Preferably, the optical lens can further satisfy 0.35 ≤ F / H ≤ 0.4 to further improve the resolution of the optical lens. More preferably, the optical lens can further satisfy 0.3759 ≤ F / H ≤ 0.3843 to further improve the imaging quality of the optical lens.

[0065] In some alternative embodiments, the optical lens satisfies: -12 ≤ F3 / F ≤ -5, where F3 is the effective focal length of the third lens and F is the effective focal length of the optical lens. By restricting -12 ≤ F3 / F ≤ -5, it can be seen that the effective focal length of the third lens is relatively large. On the one hand, it can adjust the incident angle of the large field-of-view light transmitted by the lens with a negative focal length in the front, so as to ensure that the fourth to sixth lenses at the rear have a smaller aperture, which is beneficial to compressing the volume of the optical lens and reducing the material cost. On the other hand, it can perform aberration balance adjustment on the large field-of-view light converged by the first and second lenses with negative optical power, especially adjusting the coma of the large field-of-view, and finally achieving a high imaging quality of the optical lens. Preferably, the optical lens can further satisfy -11 ≤ F3 / F ≤ -7, further reducing the volume and aberration of the optical lens. More preferably, the optical lens can further satisfy -10.6537 ≤ F3 / F ≤ -7.4994, which is beneficial to improving the imaging quality of the optical lens and reducing the size of the optical lens.

[0066] In some alternative embodiments, the optical lens satisfies: 2.2 ≤ F34 / F ≤ 5.5, where F34 is the combined focal length of the third lens and the fourth lens, and F is the effective focal length of the optical lens. By restricting 2.2 ≤ F34 / F ≤ 5.5, the third lens and the fourth lens are cemented lenses. As an intermediate combination of the optical lens, it plays a crucial transitional role. The ratio of the combined focal length of the third lens and the fourth lens to the effective focal length of the optical lens is maintained within a certain range, which can effectively correct the aberrations brought by the first lens and the second lens. In particular, it has a good adjustment effect on the spherical aberration of the central field of view and the coma of the large field of view, and finally ensures the high imaging quality of the optical lens. Preferably, the optical lens can further satisfy 3 ≤ F34 / F ≤ 5, further reducing the aberration of the optical lens. More preferably, the optical lens can further satisfy 3.2387 ≤ F34 / F ≤ 4.7634, which is beneficial to improving the imaging quality of the optical lens.

[0067] In some alternative embodiments, the optical lens satisfies: 0.8 ≤ (CT3 + CT4) / F4 ≤ 1.3, where CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and F4 is the effective focal length of the fourth lens. By restricting 0.8 ≤ (CT3 + CT4) / F4 ≤ 1.3, the cemented lens formed by cementing the third lens and the fourth lens serves as an intermediate transition lens, such that the intermediate transition lens has a relatively large thickness and the effective focal length of the fourth lens is relatively small, which can balance the optical power distribution of the front and rear optical systems, prevent the optical lens from being overly elongated, and thus achieve a smaller overall length of the optical lens and realize miniaturization. Preferably, the optical lens may further satisfy 0.9 ≤ (CT3 + CT4) / F4 ≤ 1.2 to further reduce the size of the optical lens. More preferably, the optical lens may further satisfy 0.9496 ≤ (CT3 + CT4) / F4 ≤ 1.1678 to further reduce the size of the optical lens.

[0068] In some alternative embodiments, the optical lens satisfies: 2.2 ≤ F34 / F ≤ 5.5, 0.8 ≤ (CT3 + CT4) / F4 ≤ 1.3, where F34 is the combined focal length of the third lens and the fourth lens, F is the effective focal length of the optical lens, CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and F4 is the effective focal length of the fourth lens. Such a setting is beneficial to simultaneously ensure the excellent imaging performance and miniaturization requirements of the optical lens. In particular, when the optical lens applied to the lidar module satisfies 0.8 ≤ (CT3 + CT4) / F4 ≤ 1.3 and 2.2 ≤ F34 / F ≤ 5.5, it has the advantages of miniaturization and high collimation performance. Preferably, the optical lens may further satisfy 3 ≤ F34 / F ≤ 5, 0.9 ≤ (CT3 + CT4) / F4 ≤ 1.2 to further reduce the aberration and size of the optical lens. More preferably, the optical lens may further satisfy 3.2387 ≤ F34 / F ≤ 4.7634, 0.9496 ≤ (CT3 + CT4) / F4 ≤ 1.1678, which is beneficial to improving the imaging quality of the optical lens and further reducing the size of the optical lens.

[0069] In some alternative embodiments, the optical lens satisfies: 0.8 ≤ F1 / F2 ≤ 1.4, where F1 is the effective focal length of the first lens and F2 is the effective focal length of the second lens. By restricting 0.8 ≤ F1 / F2 ≤ 1.4, both the first lens and the second lens are negative lenses and their focal lengths are close. The combination of negative focal lengths can enable the large-field-of-view light beam to quickly collect and adjust the light path at the front end of the optical lens, thereby ensuring that subsequent lenses such as the third lens have a smaller aperture, and at the same time realizing the characteristics of a large field of view angle and a small volume of the optical lens. Preferably, the optical lens can further satisfy 0.9 ≤ F1 / F2 ≤ 1.3, ensuring the characteristics of a large field of view angle and a small volume of the optical lens. More preferably, the optical lens can further satisfy 0.9495 ≤ F1 / F2 ≤ 1.2554, which is beneficial for the optical lens to achieve miniaturization while satisfying a large field of view angle.

[0070] In some alternative embodiments, the optical lens satisfies: -3.5 ≤ F1 / F ≤ -2.3, where F1 is the effective focal length of the first lens and F is the effective focal length of the optical lens. By restricting -3.5 ≤ F1 / F ≤ -2.3, the first lens receives light rays entering the optical lens at a large angle, expanding the field of view angle range of the optical lens. At the same time, it is also beneficial to reduce the sensitivity of the optical lens and realize the miniaturized design of the optical lens. Preferably, the optical lens can further satisfy -3.3 ≤ F1 / F ≤ -2.5, which is beneficial for expanding the field of view angle range and low sensitivity. More preferably, the optical lens can further satisfy -3.2611 ≤ F1 / F ≤ -2.7062, further expanding the field of view angle range.

[0071] In some alternative embodiments, the optical lens satisfies: -3.5 ≤ F2 / F ≤ -2.3, where F2 is the effective focal length of the second lens and F is the effective focal length of the optical lens. By restricting -3.5 ≤ F2 / F ≤ -2.3, the second lens has a negative focal length and a relatively small focal length, which can perform a second adjustment on the full-field light beam, deflect the large-field-of-view light beam for the second time, and turn the light beam to the transition lens group, thereby facilitating the realization of a large field of view of the optical lens. Preferably, the optical lens can further satisfy -3.3 ≤ F2 / F ≤ -2.5, which is beneficial for further adjusting the light path and increasing the field of view angle. More preferably, the optical lens can further satisfy -3.2310 ≤ F2 / F ≤ -2.5977, further realizing a large field of view of the optical lens.

[0072] In an optional embodiment, the optical lens satisfies: 1.8≤F4 / F≤2.8, wherein F4 is the effective focal length of the fourth lens, and F is the effective focal length of the optical lens. By limiting 1.8≤F4 / F≤2.8, the fourth lens is a positive lens, and the effective focal length of the fourth lens is relatively small. The fourth lens plays a key role as one of the components of the optical lens transition lens group, transmitting the light beam to the final imaging lens group, achieving aberration complementation with the front and rear optical systems, thereby achieving high imaging quality of the optical lens. Preferably, the optical lens can further satisfy 2≤F4 / F≤2.6, thereby improving the imaging quality of the optical lens. More preferably, the optical lens can further satisfy 2.0681≤F4 / F≤2.5253, thereby further improving the imaging quality of the optical lens.

[0073] In an optional embodiment, the optical lens satisfies: 3≤F5 / F≤10, wherein F5 is the effective focal length of the fifth lens, and F is the effective focal length of the optical lens. By limiting 3≤F5 / F≤10, the fifth lens is a positive lens, and the effective focal length of the fifth lens is relatively large. The fifth lens, as one of the components of the imaging lens group, initially converges the light beams of the front wide-angle focusing lens group and the transition lens group, ensuring that the effective focal length of the fifth lens is within a certain range, which is beneficial to controlling the degree of convergence of the light and improving the imaging quality of the optical lens. Preferably, the optical lens can further satisfy 4.2≤F5 / F≤8.5, which is beneficial to improving the imaging quality of the optical lens. More preferably, the optical lens can further satisfy 4.4865≤F5 / F≤8.2400, further improving the imaging quality of the optical lens.

[0074] In an optional embodiment, the optical lens satisfies: 3.8≤F6 / F≤7, wherein F6 is the effective focal length of the sixth lens, and F is the effective focal length of the optical lens. By limiting 3.8≤F6 / F≤7, the sixth lens is a positive lens, and the effective focal length of the sixth lens is relatively large. The sixth lens, as one of the components of the imaging lens group, finally images the light beam initially converged by the fifth lens, ensuring that the effective focal length of the sixth lens is within a certain range, which is conducive to achieving high imaging quality. Preferably, the optical lens can further satisfy 4.5≤F6 / F≤6.2, which is conducive to improving the imaging quality of the optical lens. More preferably, the optical lens can further satisfy 4.5334≤F6 / F≤6.1544, further improving the imaging quality of the optical lens.

[0075] In an alternative embodiment, the optical lens satisfies: 2 ≤ F6 / T56 ≤ 4.8, where F6 is the effective focal length of the sixth lens and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. By restricting 2 ≤ F6 / T56 ≤ 4.8, appropriately lengthening the air gap between the fifth lens and the sixth lens and controlling the effective focal length of the sixth lens helps the second side of the fifth lens to gently converge light to the first side of the sixth lens, alleviates the pressure on the sixth lens to correct aberrations, enables light to converge smoothly on the imaging surface, improves the imaging quality, and at the same time ensures the miniaturized design of the optical lens. Preferably, the optical lens can further satisfy 2.4 ≤ F6 / T56 ≤ 4.1, which helps to reduce the overall optical length while improving the imaging quality. More preferably, the optical lens can further satisfy 2.4238 ≤ F6 / T56 ≤ 4.0819, further reducing the overall optical length while improving the imaging quality.

[0076] In an alternative embodiment, the optical lens satisfies: 0.18 ≤ d34 / F5 ≤ 0.65, where d34 is the distance between the first side of the third lens and the second side of the fourth lens on the optical axis, and F5 is the effective focal length of the fifth lens. By restricting 0.18 ≤ d34 / F5 ≤ 0.65, appropriately increasing the distance between the first side of the third lens and the second side of the fourth lens on the optical axis can balance the distribution of the front and rear optical powers of the optical lens, prevent the optical lens from being overly elongated, thereby achieving a smaller overall length of the optical lens, realizing miniaturization, and reasonably controlling the effective focal length of the fifth lens, which helps light to converge smoothly on the imaging surface and improves the imaging quality of the optical lens. In particular, when the optical lens is applied to a lidar module, it has the advantages of miniaturization and high collimation performance. Preferably, the optical lens can further satisfy 0.25 ≤ d34 / F5 ≤ 0.54, which helps to reduce the overall optical length while improving the imaging quality. More preferably, the optical lens can further satisfy 0.2551 ≤ d34 / F5 ≤ 0.5379, further reducing the overall optical length while improving the imaging quality.

[0077] In an alternative embodiment, the optical lens satisfies: 3 ≤ d34 / T45 ≤ 100, where d34 is the distance on the optical axis between the first side of the third lens and the second side of the fourth lens, and T45 is the air gap on the optical axis between the fourth lens and the fifth lens. By restricting 3 ≤ d34 / T45 ≤ 100, appropriately increasing the distance on the optical axis between the first side of the third lens and the second side of the fourth lens, and making the air gap between the fourth lens and the fifth lens smaller, the front and rear optical power distributions of the optical lens can be balanced, which is beneficial to simultaneously achieving high imaging quality and miniaturization of the optical lens. In particular, when the optical lens is applied to a lidar module, it has the advantages of miniaturization and high collimation performance. Preferably, the optical lens can further satisfy 4 ≤ d34 / T45 ≤ 74, which is beneficial to achieving high imaging quality while reducing the overall optical length. More preferably, the optical lens further satisfies 5 ≤ d34 / T45 ≤ 64, achieving high imaging quality while further reducing the overall optical length. Most preferably, the optical lens can satisfy 5.4588 ≤ d34 / T45 ≤ 63.3970, enabling the optical lens to simultaneously achieve high imaging quality and miniaturization.

[0078] In an alternative embodiment, the optical lens satisfies: 10 ≤ TTL / F ≤ 12; where TTL is the overall optical length of the optical lens and F is the effective focal length of the optical lens. By restricting 10 ≤ TTL / F ≤ 12, it is beneficial to reduce the overall optical length of the optical lens and miniaturize the optical lens. Preferably, the optical lens can further satisfy 10.6 ≤ TTL / F ≤ 11.5, which is beneficial to reducing the overall optical length and achieving miniaturization of the optical lens. More preferably, the optical lens can further satisfy 10.6595 ≤ TTL / F ≤ 11.4757, which is beneficial to further reducing the size of the optical lens.

[0079] In an alternative embodiment, the optical lens satisfies: 0.02 ≤ TTL / H / FOV ≤ 0.03; where TTL is the overall optical length of the optical lens, FOV is the maximum field of view angle of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens. By restricting 0.02 ≤ TTL / H / FOV ≤ 0.03, it is beneficial to reduce the overall optical length of the optical lens while ensuring the field of view angle of the optical lens, which is beneficial to achieving miniaturization of the optical lens. Preferably, the optical lens can further satisfy 0.023 ≤ TTL / H / FOV ≤ 0.026, which is beneficial to reducing the overall optical length and achieving miniaturization of the optical lens. More preferably, the optical lens can further satisfy 0.0236 ≤ TTL / H / FOV ≤ 0.0256, which is beneficial to further reducing the size of the optical lens.

[0080] In an alternative embodiment, the optical lens satisfies: 1.7 ≤ TTL / DMAX ≤ 2.2; where TTL is the overall optical length of the optical lens, and DMAX is the maximum clear aperture of the optical lens. By restricting 1.7 ≤ TTL / DMAX ≤ 2.2, it is beneficial to reduce the overall optical length of the optical lens while ensuring that the maximum clear aperture of the optical lens is within a reasonable range, which is beneficial for making the entire optical lens more compact. Preferably, the optical lens may further satisfy 1.8 ≤ TTL / DMAX ≤ 2.1, which is beneficial for miniaturizing the optical lens. More preferably, the optical lens may further satisfy 1.8006 ≤ TTL / DMAX ≤ 2.0527, which is beneficial for miniaturizing the optical lens.

[0081] In an alternative embodiment, the optical lens satisfies: 0.46 ≤ (F×θ) / D ≤ 0.57; where F is the effective focal length of the optical lens, θ is the radian value corresponding to the maximum field of view angle of the optical lens, and D is the clear aperture corresponding to the maximum field of view angle on the first side of the first lens. By restricting 0.46 ≤ (F×θ) / D ≤ 0.57, the front aperture of the optical lens can be made smaller, reducing the volume of the optical lens. Preferably, the optical lens may further satisfy 0.49 ≤ (F×θ) / D ≤ 0.55, which is beneficial for miniaturizing the optical lens. More preferably, the optical lens may further satisfy 0.4947 ≤ (F×θ) / D ≤ 0.5459, which is beneficial for further reducing the size of the optical lens.

[0082] In an alternative embodiment, the optical lens satisfies: 0.01 ≤ D / H / FOV ≤ 0.015; where FOV is the maximum field of view angle of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, and D is the clear aperture corresponding to the maximum field of view angle on the first side of the first lens. By restricting 0.01 ≤ D / H / FOV ≤ 0.015, the front aperture can be made small, enabling miniaturization. Preferably, the optical lens may further satisfy 0.012 ≤ D / H / FOV ≤ 0.014, which is beneficial for miniaturizing the optical lens. More preferably, the optical lens may further satisfy 0.0122 ≤ D / H / FOV ≤ 0.0133, which is beneficial for further reducing the size of the optical lens.

[0083] In an alternative embodiment, the optical lens satisfies: 0.9 ≤ D / H / F ≤ 1.1; where F is the effective focal length of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, and D is the clear aperture corresponding to the maximum field of view angle of the optical lens on the first side of the first lens. By restricting 0.9 ≤ D / H / F ≤ 1.1, under the condition of a fixed focal length, the optical lens can be provided with the characteristics of a large imaging surface and a small front aperture. Preferably, the optical lens may further satisfy 0.94 ≤ D / H / F ≤ 1.05, which is beneficial to further reducing the front aperture and facilitating miniaturization. More preferably, the optical lens may further satisfy 0.9466 ≤ D / H / F ≤ 1.0418, which is beneficial to further reducing the front aperture and facilitating miniaturization.

[0084] In an alternative embodiment, the optical lens satisfies: 0.1 ≤ BFL / TTL ≤ 0.18; where TTL is the overall optical length of the optical lens and BFL is the back focal length of the optical lens. By restricting 0.1 ≤ BFL / TTL ≤ 0.18, the back focal length of the optical lens is reasonably controlled. On the one hand, the incident angle of the chief ray on the imaging surface can be made smaller, and at the same time, the miniaturization of the optical lens can be achieved. On the other hand, sufficient space is left for the external module. Preferably, the optical lens may further satisfy 0.12 ≤ BFL / TTL ≤ 0.17, balancing the volume and space of the optical lens, which is beneficial to the miniaturization of the optical lens. More preferably, the optical lens may further satisfy 0.1211 ≤ BFL / TTL ≤ 0.1648, further balancing the volume and space of the optical lens, which is beneficial to the miniaturization of the optical lens.

[0085] In an alternative embodiment, the optical lens satisfies: 0.13 ≤ F / ENPD / D ≤ 0.18; where F is the effective focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, and D is the clear aperture corresponding to the maximum field of view angle of the optical lens on the first side of the first lens. By restricting 0.13 ≤ F / ENPD / D ≤ 0.18, under the condition of ensuring high-energy laser emission, a small aperture is guaranteed to achieve the miniaturization of the optical lens. Preferably, the optical lens may further satisfy 0.14 ≤ F / ENPD / D ≤ 0.17, which is beneficial to the miniaturization of the optical lens. More preferably, the optical lens may further satisfy 0.1498 ≤ F / ENPD / D ≤ 0.1624, which is beneficial to the miniaturization of the optical lens.

[0086] In an alternative embodiment, the optical lens satisfies: 0.09 ≤ (H / 2) / (F × tan(θ / 2)) ≤ 0.12; where H is the image height corresponding to the maximum field of view angle of the optical lens, F is the effective focal length of the optical lens, and θ is the radian value corresponding to the maximum field of view angle of the optical lens. By restricting 0.09 ≤ (H / 2) / (F × tan(θ / 2)) ≤ 0.12, the ratio of the actual image height to the ideal image height is reflected, controlling the optical distortion of the optical lens, which is beneficial to achieving a wide-angle field of view. Preferably, the optical lens may further satisfy 0.1 ≤ (H / 2) / (F × tan(θ / 2)) ≤ 0.11, which is beneficial to achieving a large field of view angle and high imaging quality. More preferably, the optical lens may further satisfy 0.1070 ≤ (H / 2) / (F × tan(θ / 2)) ≤ 0.1094, which is beneficial to further ensuring a large field of view angle and high imaging quality.

[0087] In an alternative embodiment, the optical lens satisfies: -1.8 ≤ R8 / R7 ≤ -0.8; where R7 is the radius of curvature of the first side of the fourth lens, and R8 is the radius of curvature of the second side of the fourth lens. By restricting -1.8 ≤ R8 / R7 ≤ -0.8, both the first side and the second side of the fourth lens are convex surfaces, and their bending degrees are close to or equal, providing a relatively high positive refractive power and undertaking the main converging task, compensating for the positive optical power with the front-end optical system, having a relatively good imaging effect, and at the same time avoiding large deflections of light rays passing through the first side and the second side of the fourth lens, which is beneficial to improving the imaging quality. Preferably, the optical lens may further satisfy -1.55 ≤ R8 / R7 ≤ -0.95, which helps to optimize the light path passing through the optical lens and improve the imaging quality. More preferably, the optical lens may further satisfy -1.6035 ≤ R8 / R7 ≤ -0.9963, which is beneficial to further improving the imaging quality of the optical lens.

[0088] In an alternative embodiment, the optical lens satisfies: 0.65 ≤ F5 / F6 ≤ 1.85; where F5 is the effective focal length of the fifth lens, and F6 is the effective focal length of the sixth lens. By restricting 0.65 ≤ F5 / F6 ≤ 1.85, both the fifth lens and the sixth lens are positive lenses and their focal lengths are close. As the imaging group of the optical lens, they play a decisive role. The ratio of the effective focal lengths of the fifth lens and the sixth lens is close and remains within a certain range, enabling further compensation and adjustment of the aberrations of the optical lens and finally forming an image, achieving relatively high imaging performance of the optical lens. Preferably, the optical lens may further satisfy 0.9 ≤ F5 / F6 ≤ 1.7, which is beneficial to further reducing the aberrations of the optical lens and improving the imaging quality of the optical lens. More preferably, the optical lens may further satisfy 0.9376 ≤ F5 / F6 ≤ 1.6754, which is beneficial to further improving the imaging quality of the optical lens.

[0089] In an alternative embodiment, the optical lens satisfies: -7.8 ≤ R10 / F ≤ -3; where R10 is the radius of curvature of the second surface of the fifth lens, and F is the effective focal length of the optical lens. By restricting -7.8 ≤ R10 / F ≤ -3, the second surface of the fifth lens is relatively convex, and the light rays in the front are quickly converged and adjusted by the second surface of the fifth lens, which is beneficial to reducing the aperture of the sixth lens. Preferably, the optical lens may further satisfy -7 ≤ R10 / F ≤ -3.5, reducing the aperture of the sixth lens, which is beneficial to miniaturizing the optical lens. More preferably, the optical lens may further satisfy -6.7249 ≤ R10 / F ≤ -3.8045, further reducing the aperture of the sixth lens, which is beneficial to miniaturizing the optical lens.

[0090] In an alternative embodiment, the optical lens satisfies: 2 ≤ F6 / T56 ≤ 4.8, -7.8 ≤ R10 / F ≤ -3; where R10 is the radius of curvature of the second surface of the fifth lens, F is the effective focal length of the optical lens, F6 is the effective focal length of the sixth lens, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. The combination of R10 / F and F6 / T56, by designing the second surface of the fifth lens to be relatively convex, the air gap between the fifth lens and the sixth lens, and the effective focal length of the sixth lens to be relatively long, makes the chief rays of each field of view passing through the fifth lens be in a state close to parallel to the optical axis, ensuring a high reception efficiency and imaging quality of the imaging chip, and thus being beneficial to the optical lens to simultaneously achieve a wide field of view, a small CRA, and a high imaging quality. In particular, when the optical lens is applied to a lidar emission lens, a high emission collimation performance can be achieved. Preferably, the optical lens may further satisfy 0.9 ≤ F5 / F6 ≤ 1.7, -7 ≤ R10 / F ≤ -3.5, which is beneficial to further reducing the aberration and aperture of the optical lens, ensuring miniaturization while improving the imaging quality of the optical lens. More preferably, the optical lens may further satisfy 0.9376 ≤ F5 / F6 ≤ 1.6754, -6.7249 ≤ R10 / F ≤ -3.8045, which is beneficial to further improving the imaging quality of the optical lens and ensuring miniaturization.

[0091] In an alternative embodiment, the optical lens satisfies: 3.3 ≤ R1 / R2 ≤ 5.5; where R1 is the radius of curvature of the first side of the first lens, and R2 is the radius of curvature of the second side of the first lens. By restricting 3.3 ≤ R1 / R2 ≤ 5.5, the first lens is in a meniscus shape with the concave surface facing the second side, and the radius of curvature of the first side of the first lens is greater than that of the second side, which is beneficial to the collection of light beams in the wide-angle field of view and enables a large field of view angle of the optical lens. Preferably, the optical lens may further satisfy 3.8 ≤ R1 / R2 ≤ 5, which is beneficial to increasing the field of view angle of the optical lens. More preferably, the optical lens may further satisfy 3.8151 ≤ R1 / R2 ≤ 4.9320, which is beneficial to further increasing the field of view angle of the optical lens.

[0092] In an alternative embodiment, the optical lens satisfies: -0.25 ≤ SAG10 / (D10 / 2) ≤ -0.05; where SAG10 is the sag of the second side of the fifth lens, and D10 is the clear aperture corresponding to the maximum field of view angle of the optical lens on the second side of the fifth lens. By restricting -0.25 ≤ SAG10 / (D10 / 2) ≤ -0.05, the sag and aperture of the second side of the fifth lens are reasonably controlled, and the front light beam is compressed, thereby ensuring a smaller aperture of the sixth lens, which is beneficial to the miniaturization of the optical lens. Preferably, the optical lens may further satisfy -0.21 ≤ SAG10 / (D10 / 2) ≤ -0.09, which is beneficial to further miniaturizing the optical lens. More preferably, the optical lens may further satisfy -0.2085 ≤ SAG10 / (D10 / 2) ≤ -0.0966, which is beneficial to further miniaturizing the optical lens.

[0093] In an alternative embodiment, the optical lens satisfies: 0.14 ≤ SAG11 / (D11 / 2) ≤ 0.41; where SAG11 is the sag of the first side of the sixth lens, and D11 is the clear aperture corresponding to the maximum field of view angle of the optical lens on the first side of the sixth lens. By restricting 0.14 ≤ SAG11 / (D11 / 2) ≤ 0.41, the sag and aperture of the first side of the sixth lens are reasonably controlled, the light beam trend is controlled and final imaging is performed, ensuring that the angular spread of the sixth lens is within a certain range, which is beneficial to the optical lens achieving high resolution and enabling the optical lens to have high imaging quality. Preferably, the optical lens may further satisfy 0.19 ≤ SAG11 / (D11 / 2) ≤ 0.36, enabling the optical lens to achieve high resolution and further improving the imaging quality of the optical lens. More preferably, the optical lens may further satisfy 0.1936 ≤ SAG11 / (D11 / 2) ≤ 0.3518, which is beneficial to further improving the imaging quality of the optical lens.

[0094] In an alternative embodiment, the optical lens satisfies: 0 ≤ TAN(CRA) × BFL ≤ 0.2; where CRA is the incident angle of the chief ray of the maximum field of view of the optical lens on the imaging surface, and BFL is the back focal length of the optical lens. By limiting 0 ≤ TAN(CRA) × BFL ≤ 0.2, the incident angle of the chief ray of the maximum field of view of the optical lens is small, which is beneficial to ensuring a high reception efficiency of the imaging chip and improving the imaging quality of the optical lens. In particular, for an optical lens applied to lidar emission, it is beneficial to the high-energy emission of the laser and improves the light output efficiency. Preferably, the optical lens may further satisfy 0.01 ≤ TAN(CRA) × BFL ≤ 0.16, further improving the imaging quality of the optical lens. More preferably, the optical lens may further satisfy 0.0111 ≤ TAN(CRA) × BFL ≤ 0.1516, which is beneficial to further improving the imaging quality of the optical lens.

[0095] In an alternative embodiment, the optical lens satisfies: -1.6 ≤ R5 / F2 ≤ -0.75; where R5 is the radius of curvature of the first side of the third lens, and F2 is the effective focal length of the second lens. By limiting -1.6 ≤ R5 / F2 ≤ -0.75, reasonably controlling the ratio of the radius of curvature of the first side of the third lens to the effective focal length of the second lens, the trend of the continuously diffused light passing through the second lens can be adjusted to be slightly gentle, thereby alleviating the resolution pressure on the marginal field of view of the subsequent third lens to the sixth lens, and further improving the imaging quality of the optical lens. Preferably, the optical lens may further satisfy -1.4 ≤ R5 / F2 ≤ -0.9, balancing the optical path trend of the optical lens, which is beneficial to further improving the imaging quality of the optical lens. More preferably, the optical lens may further satisfy -1.3980 ≤ R5 / F2 ≤ -0.9259, which is beneficial to further improving the resolution of the optical lens and further improving the imaging quality of the optical lens.

[0096] It should be noted that the total optical length TTL of the optical lens is the distance on the optical axis between the first side of the first lens and the imaging surface of the optical lens, the back focal length BFL is the distance on the optical axis between the second side of the sixth lens and the imaging surface of the optical lens, the sagitta SAG10 of the second side of the fifth lens is the distance on the optical axis between the intersection of the second side of the fifth lens and the optical axis of the optical lens and the vertex of the effective radius of the second side of the fifth lens, and the sagitta SAG11 of the first side of the sixth lens is the distance on the optical axis between the intersection of the first side of the sixth lens and the optical axis of the optical lens and the vertex of the effective radius of the first side of the sixth lens.

[0097] In another alternative embodiment, by controlling -12 ≤ F3 / F ≤ -5, the effective focal length of the third lens can be set to be relatively large. At this time, the incident angles of the large field-of-view light rays transmitted by the front first lens and second lens can be adjusted, so as to ensure a relatively small aperture for the subsequent fourth lens, fifth lens, and sixth lens, compress the volume of the optical lens, reduce the material cost, and at the same time perform aberration balance adjustment on the large field-of-view light rays converged by the front first lens and second lens with negative optical power, especially coma adjustment under a large field of view, ultimately achieving high imaging quality of the optical lens.

[0098] In addition, in another alternative embodiment, by setting -1.7 ≤ R8 / R7 ≤ -0.8, 0.8 ≤ (CT3 + CT4) / F4 ≤ 1.3, and 2.2 ≤ F34 / F ≤ 5.5, the curvature radii of the first side and the second side of the fourth lens are close to or equal, and both the first side and the second side of the fourth lens are convex surfaces, forming a thick lens group with the third lens to form a relatively high positive refractive power and undertake the main converging task, maintaining better performance. The third lens and the fourth lens are cemented as an intermediate transition, and the thickness of the cemented lens is relatively thick, which helps to improve the structural stability and optical performance. At the same time, the effective focal length of the fourth lens is relatively small, which can balance the optical power distribution of the front and rear optical systems, prevent the optical lens from being overly elongated, and thus achieve a relatively small total length of the optical lens, meeting the miniaturization trend of the radar module. Optionally, the above optical lens may further include a filter for correcting color deviation and a protective glass for protecting the photosensitive element located on the imaging surface.

[0099] The optical lens in the present application can adopt multiple lenses, such as the six lenses described above. In the present application, at least one of the lens surfaces of each lens is an aspherical lens surface. The characteristic of an aspherical lens is that the curvature continuously changes from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberrations that occur during imaging as much as possible, thereby improving the imaging quality. The setting of the aspherical lens helps to correct the system aberration and improve the resolution. Specifically, when focusing on the imaging quality of the optical lens, the first lens to the sixth lens can all use aspherical lenses.

[0100] In an exemplary embodiment, the first lens to the sixth lens may all be glass lenses. An optical lens made of glass can suppress the shift of the back focus of the optical lens with temperature changes, so as to improve the system stability. At the same time, using glass material can avoid the blurring of the lens imaging caused by the temperature changes of high and low temperatures in the use environment, which affects the normal use of the lens. For example, an optical lens with a full glass design has a wide temperature range and can maintain stable optical performance in the range of -40°C to 105°C. Specifically, when focusing on the resolution quality and reliability, the first lens to the sixth lens may all be glass aspherical lenses. Of course, in application scenarios with lower requirements for temperature stability, the first lens to the sixth lens in the optical lens may also all be made of plastic. Making the optical lens with plastic can effectively reduce the manufacturing cost. Of course, the first lens to the sixth lens in the optical lens may also be made of a combination of plastic and glass.

[0101] However, those skilled in the art should understand that without departing from the technical solution claimed in this application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical lens is not limited to including six lenses. If necessary, the optical lens may also include other numbers of lenses.

[0102] The following further describes, with reference to the accompanying drawings, examples of the specific surface types and parameters of the optical lens applicable to the above embodiments.

[0103] It should be noted that in the basic structural parameter table of the optical lenses in Embodiments 1 to 14, the unit of the radius of curvature Radius, thickness Thickness / distance is millimeter (mm), Surf is the surface number of the lens, Nd is the refractive index, Vd is the Abbe number, and Infinity represents infinity. In the MTF curve graphs of the optical lenses in Embodiments 1 to 14, the abscissa is the spatial frequency, with the unit of lp / mm (Spatial Frequency in cycles per mm); the ordinate is the modulus of the optical transfer function (Modulus of the OTF, where OTF is the abbreviation of Optical Transfer Function). Among them, 0.00 (deg)-Tangential represents the curve at the 0° field of view in the meridional direction, that is, the curve at the central field of view in the meridional direction; 0.00 (deg)-Sagittal represents the curve at the 0° field of view in the sagittal direction, that is, the curve at the central field of view in the sagittal direction; 46.74 (deg)-Tangential represents the curve at the 46.74° field of view in the meridional direction; 46.74 (deg)-Sagittal represents the curve at the 46.74° field of view in the sagittal direction; 85.3 (deg)-Tangential represents the curve at the 85.3° field of view in the meridional direction; 85.3 (deg)-Sagittal represents the curve at the 85.3° field of view in the sagittal direction.

[0104] Embodiment 1

[0105] As Figure 1 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0106] In this embodiment, the first lens L1 has a negative focal power. The first surface S1 of the first lens is convex, and the second surface S2 of the first lens is concave. The second lens L2 has a negative focal power. The first surface S3 of the second lens is convex, and the second surface S4 of the second lens is concave. The third lens L3 has a negative focal power. The first surface S5 of the third lens is convex, and the second surface S6 of the third lens is concave. The fourth lens L4 has a positive focal power. The first surface S7 of the fourth lens is convex, and the second surface S8 of the fourth lens is convex. The fifth lens L5 has a positive focal power. The first surface S9 of the fifth lens is concave, and the second surface S10 of the fifth lens is convex. The sixth lens L6 has a positive focal power. The first surface S11 of the sixth lens is convex, and the second surface S12 of the sixth lens is concave. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 1 shows the basic structural parameter table of the optical lens in the first embodiment.

[0107] Table 1

[0108]

[0109] Figure 15 shows the MTF curve graph of the optical lens in the first embodiment, which represents the transmission ability of the optical lens to light of different wavelengths. It can be seen from Figure 15 that the resolution of the optical lens can reach more than 0.75 when it is 28 lp / mm, the image is uniform, meeting the requirements of high resolution, and showing good imaging effects.

[0110] Embodiment 2

[0111] As Figure 2 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0112] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is concave, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is concave. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The aperture stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 2 shows the basic structural parameter table of the optical lens of Embodiment 2.

[0113] Table 2

[0114]

[0115] Figure 16 shows the MTF curve graph of the optical lens of Embodiment 2, which represents the transmission ability of the optical lens to light of different wavelengths. It can be seen from Figure 16 that when the resolution of the optical lens is 28 lp / mm, it can reach above 0.78, the image is uniform, meeting the requirements of high resolution and showing a good imaging effect.

[0116] Embodiment 3

[0117] As Figure 3 shown, the optical lens sequentially includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0118] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is convex, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is concave. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 3 shows the basic structural parameter table of the optical lens in Embodiment 3.

[0119] Table 3

[0120]

[0121] Figure 17 shows the MTF curve graph of the optical lens in Embodiment 3, which represents the transmission ability of the optical lens to light of different wavelengths. It can be seen from Figure 17 that when the resolution of the optical lens is 28 lp / mm, it can reach above 0.78, the image is uniform, meeting the requirements of high resolution, and showing a good imaging effect.

[0122] Embodiment 4

[0123] As Figure 4 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0124] In this embodiment, the first lens L1 has a negative focal power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative focal power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative focal power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive focal power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive focal power. The first side S9 of the fifth lens is convex, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive focal power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is concave. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 4 shows the basic structural parameter table of the optical lens of the fourth embodiment.

[0125] Table 4

[0126]

[0127] Figure 18 shows the MTF curve graph of the optical lens of the fourth embodiment, which represents the transmission ability of the optical lens to light of different wavelengths. It can be seen from Figure 18 that when the resolution of the optical lens is 28 lp / mm, it can reach above 0.72, the image is uniform, meeting the requirements of high resolution and showing good imaging effects.

[0128] Embodiment Five

[0129] As Figure 5 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0130] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is concave, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is convex. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The aperture stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 5 shows the basic structural parameter table of the optical lens of Embodiment 5.

[0131] Table 5

[0132]

[0133] Figure 19 shows the MTF curve graph of the optical lens of Embodiment 5, which represents the transmission ability of the optical lens to light of different wavelengths. From Figure 19 it can be seen that the resolution of the optical lens can reach above 0.54 when it is 28 lp / mm, the image is uniform, meeting the requirements of high resolution, and showing a good imaging effect.

[0134] Embodiment 6

[0135] As Figure 6 shown, the optical lens sequentially includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0136] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is concave, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is convex. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 6 shows the basic structural parameter table of the optical lens of Embodiment 6.

[0137] Table 6

[0138]

[0139] Figure 20 shows the MTF curve graph of the optical lens of Embodiment 6, which represents the transmission ability of the optical lens to light of different wavelengths. It can be seen from Figure 20 that when the resolution of the optical lens is 28 lp / mm, it can reach above 0.43, the image is uniform, meeting the requirements of high resolution and showing good imaging effects.

[0140] Embodiment 7

[0141] As Figure 7 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0142] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is convex, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is convex. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The aperture stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 7 shows the basic structural parameter table of the optical lens of Embodiment VII.

[0143] Table 7

[0144]

[0145] Figure 21 shows the MTF curve graph of the optical lens of Embodiment VII, which represents the transmission ability of the optical lens to light of different wavelengths. It can be seen from Figure 21 that when the resolution of the optical lens is 28 lp / mm, it can reach more than 0.75, the image is uniform, meeting the requirements of high resolution and showing good imaging effects.

[0146] Embodiment VIII

[0147] As Figure 8 shown, the optical lens sequentially includes a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0148] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is convex, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is convex. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 8 shows the basic structural parameter table of the optical lens of Embodiment VIII.

[0149] Table 8

[0150]

[0151] Figure 22 shows the MTF curve graph of the optical lens of Embodiment VIII, which represents the transmission ability of the optical lens to light of different wavelengths. From Figure 22 it can be seen that the resolution of this optical lens can reach above 0.76 when it is 28 lp / mm, the image is uniform, meeting the requirements of high resolution and showing good imaging effects.

[0152] Embodiment IX

[0153] As Figure 9 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0154] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is flat, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is concave. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 9 shows the basic structural parameter table of the optical lens of Embodiment Nine.

[0155] Table 9

[0156]

[0157] Figure 23 shows the MTF curve graph of the optical lens of Embodiment Nine, which represents the transmission ability of the optical lens to light of different wavelengths. It can be seen from Figure 23 that when the resolution of the optical lens is 28 lp / mm, it can reach above 0.80, the image is uniform, meeting the requirements of high resolution, and showing a good imaging effect.

[0158] Embodiment Ten

[0159] As Figure 10 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0160] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is flat, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is concave. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 10 shows the basic structural parameter table of the optical lens in Embodiment Ten.

[0161] Table 10

[0162]

[0163] Figure 24 shows the MTF curve graph of the optical lens in Embodiment Ten, which represents the transmission ability of the optical lens to light of different wavelengths. From Figure 24 it can be seen that when the resolution of the optical lens is 28 lp / mm, it can reach above 0.81, the image is uniform, meeting the requirements of high resolution, and showing good imaging effects.

[0164] Embodiment Eleven

[0165] As Figure 11 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0166] In this embodiment, the first lens L1 has a negative focal power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative focal power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative focal power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive focal power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive focal power. The first side S9 of the fifth lens is convex, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive focal power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is flat. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 11 shows the basic structural parameter table of the optical lens in Embodiment XI.

[0167] Table 11

[0168]

[0169] Figure 25 shows the MTF curve graph of the optical lens in Embodiment XI, which represents the transmission ability of the optical lens to light of different wavelengths. It can be seen from Figure 25 that when the resolution of the optical lens is 28 lp / mm, it can reach above 0.67, the image is uniform, meeting the requirements of high resolution and showing good imaging effects.

[0170] Embodiment XII

[0171] As Figure 12 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0172] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is convex, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is flat. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 12 shows the basic structural parameter table of the optical lens of Embodiment Twelve.

[0173] Table 12

[0174]

[0175] Figure 26 shows the MTF curve graph of the optical lens of Embodiment Twelve, which represents the transmission ability of the optical lens to light of different wavelengths. From Figure 26 it can be seen that the resolution of the optical lens can reach above 0.67 when it is 28 lp / mm, the image is uniform, meeting the requirements of high resolution and showing good imaging effects.

[0176] Embodiment Thirteen

[0177] As Figure 13 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0178] In this embodiment, the first lens L1 has a negative optical power. The first side S1 of the first lens is convex, and the second side S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side S3 of the second lens is convex, and the second side S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side S5 of the third lens is convex, and the second side S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side S7 of the fourth lens is convex, and the second side S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side S9 of the fifth lens is flat, and the second side S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side S11 of the sixth lens is convex, and the second side S12 of the sixth lens is flat. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 13 shows the basic structural parameter table of the optical lens of Embodiment Thirteen.

[0179] Table 13

[0180]

[0181] Figure 27 shows the MTF curve graph of the optical lens of Embodiment Thirteen, which represents the transmission ability of the optical lens to light of different wavelengths. It can be seen from Figure 27 that when the resolution of the optical lens is 28 lp / mm, it can reach above 0.70, the image is uniform, meeting the requirements of high resolution, and showing good imaging effects.

[0182] Embodiment Fourteen

[0183] As Figure 14 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0184] In this embodiment, the first lens L1 has a negative optical power. The first surface S1 of the first lens is convex, and the second surface S2 of the first lens is concave. The second lens L2 has a negative optical power. The first surface S3 of the second lens is convex, and the second surface S4 of the second lens is concave. The third lens L3 has a negative optical power. The first surface S5 of the third lens is convex, and the second surface S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first surface S7 of the fourth lens is convex, and the second surface S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first surface S9 of the fifth lens is flat, and the second surface S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first surface S11 of the sixth lens is convex, and the second surface S12 of the sixth lens is flat. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 14 shows the basic structural parameter table of the optical lens of Embodiment 14.

[0185] Table 14

[0186]

[0187] Figure 28 shows the MTF curve graph of the optical lens of Embodiment 14, which represents the transmission ability of the optical lens to light of different wavelengths. From Figure 28 it can be seen that the resolution of the optical lens can reach above 0.69 when it is 28 lp / mm, the image is uniform, meeting the requirements of high resolution and showing good imaging effects.

[0188] Comparative Example 1

[0189] As Figure 29 shown, the optical lens sequentially includes a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an imaging surface IMA from the object side to the image side.

[0190] In Comparative Example 1, the first lens L1 has a negative optical power. The first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is concave. The second lens L2 has a negative optical power. The first side surface S3 of the second lens is convex, and the second side surface S4 of the second lens is concave. The third lens L3 has a negative optical power. The first side surface S5 of the third lens is convex, and the second side surface S6 of the third lens is concave. The fourth lens L4 has a positive optical power. The first side surface S7 of the fourth lens is convex, and the second side surface S8 of the fourth lens is convex. The fifth lens L5 has a positive optical power. The first side surface S9 of the fifth lens is concave, and the second side surface S10 of the fifth lens is convex. The sixth lens L6 has a positive optical power. The first side surface S11 of the sixth lens is convex, and the second side surface S12 of the sixth lens is concave. Among them, the third lens E3 and the fourth lens E4 form a cemented lens. The stop STO is located between the second lens E2 and the third lens E3. The light from the object sequentially passes through the surfaces S1 to S12 and finally forms an image on the imaging surface IMA. Table 15 shows the basic structural parameter table of the optical lens in Comparative Example 1.

[0191] Table 15

[0192]

[0193] Compared with Embodiments 1 to 7, in the optical lens of Comparative Example 1, T56 is only 2.004 mm. At this time, T56 / R10 = -0.169. The air gap between the fifth lens and the sixth lens on the optical axis is relatively small, and the angle between the marginal field light ray and the optical axis is too large, which is not conducive to the imaging surface receiving light and affects the imaging quality. [[ID= 10]] Figure 30 shows the MTF curve graph of the optical lens in Comparative Example 1, which represents the light transmission ability of the optical lens for light rays of different wavelengths. From Figure 30 it can be seen that the minimum value of the resolution of this optical lens is as low as 0.27 at 28 lp / mm, the image is blurred, and the imaging effect is not good.

[0194] Comparing with Embodiments 1 to 7, it can be known that increasing the air gap between the fifth lens and the sixth lens on the optical axis of the optical lens can effectively ensure that the intersection height position of the chief ray of each field of view on the first side surface of the sixth lens is close to the corresponding image height, so that the chief rays of each field of view are nearly parallel to the optical axis. Thus, while restricting the volume of the optical lens, a higher receiving efficiency and imaging quality of the imaging surface are ensured, and finally a wide-angle field of view, a smaller CRA, and a higher imaging quality of the optical lens are achieved.

[0195] It should be noted that the air gap between the fifth lens and the sixth lens on the optical axis cannot be infinitely elongated. To ensure the miniaturization and imaging quality of the optical lens, it is necessary to constrain the optical lens to satisfy -0.42 ≤ T56 / R10 ≤ -0.25.

[0196] In summary, Examples 1 to 7 respectively satisfy the relationships shown in Table 16, and Examples 8 to 14 respectively satisfy the relationships shown in Table 17.

[0197] Table 16

[0198]

[0199] Table 17

[0200]

[0201] Table 18 gives the parameter values of the optical lenses of Examples 1 to 7, and Table 19 gives the parameter values of the optical lenses of Examples 8 to 14.

[0202] Table 18

[0203]

[0204] Table 19

[0205]

[0206] This application also provides an electronic device, including the above-described optical lens and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The imaging element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The electronic device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The electronic device is equipped with the optical lens described above.

[0207] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0208] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0209] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here.

[0210] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that, The optical lens is composed of six lenses, and the optical lens sequentially includes, along the optical axis, from the first side to the second side: A first lens having a negative focal power, wherein a first side surface of the first lens is convex, and a second side surface of the first lens is concave; A second lens having a negative focal power, wherein a first side surface of the second lens is convex, and a second side surface of the second lens is concave; A third lens having a negative focal power, wherein a first side surface of the third lens is convex, and a second side surface of the third lens is concave; A fourth lens having a positive focal power, wherein a first side surface of the fourth lens is convex, and a second side surface of the fourth lens is convex; A fifth lens having a positive focal power, wherein a second side surface of the fifth lens is convex; A sixth lens having a positive focal power, wherein a first side surface of the sixth lens is convex; The optical lens satisfies: -0.42 ≤ T56 / R10 ≤ -0.25, where T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and R10 is the radius of curvature of the second side surface of the fifth lens.

2. The optical lens according to claim 1, wherein The first side surface of the fifth lens is concave; or The first side surface of the fifth lens is convex; or The first side surface of the fifth lens is flat.

3. The optical lens according to claim 1, wherein The second side surface of the sixth lens is concave; or The second side surface of the sixth lens is convex; or The second side surface of the sixth lens is flat.

4. The optical lens according to claim 1, characterized in that, The third lens and the fourth lens are cemented to form a cemented lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.34 ≤ F / H ≤ 0.42, where F is the effective focal length of the optical lens, and H is the image height corresponding to the maximum field of view angle of the optical lens.

6. The optical lens according to claim 1, wherein The optical lens satisfies: -12 ≤ F3 / F ≤ -5, where F3 is the effective focal length of the third lens, and F is the effective focal length of the optical lens.

7. The optical lens according to claim 1, wherein The optical lens satisfies: 0.8 ≤ (CT3 + CT4) / F4 ≤ 1.3, where CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, and F4 is the effective focal length of the fourth lens.

8. The optical lens according to claim 1, wherein The optical lens satisfies: 0.8 ≤ F1 / F2 ≤ 1.4, where F1 is the effective focal length of the first lens, and F2 is the effective focal length of the second lens.

9. The optical lens according to claim 1, wherein, The optical lens satisfies: -3.5 ≤ F1 / F ≤ -2.3, where F1 is the effective focal length of the first lens, and F is the effective focal length of the optical lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies: -3.5 ≤ F2 / F ≤ -2.3, where F2 is the effective focal length of the second lens, and F is the effective focal length of the optical lens.

11. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 1.8 ≤ F4 / F ≤ 2.8, where F4 is the effective focal length of the fourth lens, and F is the effective focal length of the optical lens.

12. The optical lens according to claim 1, wherein The optical lens satisfies: 2.2 ≤ F34 / F ≤ 5.5, where F34 is the combined focal length of the third lens and the fourth lens, and F is the effective focal length of the optical lens.

13. The optical lens according to claim 1, wherein The optical lens satisfies: 3 ≤ F5 / F ≤ 10, where F5 is the effective focal length of the fifth lens, and F is the effective focal length of the optical lens.

14. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 3.8 ≤ F6 / F ≤ 7, where F6 is the effective focal length of the sixth lens, and F is the effective focal length of the optical lens.

15. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 2 ≤ F6 / T56 ≤ 4.8, where F6 is the effective focal length of the sixth lens, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

16. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 0.18 ≤ d34 / F5 ≤ 0.65, where d34 is the distance between the first side of the third lens and the second side of the fourth lens on the optical axis, and F5 is the effective focal length of the fifth lens.

17. The optical lens according to claim 1, characterized in that, The optical lens satisfies: 3 ≤ d34 / T45 ≤ 100, where d34 is the distance between the first side of the third lens and the second side of the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

18. The optical lens according to any one of claims 1 to 17, characterized in that The optical lens satisfies at least one of the following relationships: 10 ≤ TTL / F ≤ 12, 0.02 ≤ TTL / H / FOV ≤ 0.03, 1.7 ≤ TTL / DMAX ≤ 2.2, 0.46 ≤ (F × θ) / D ≤ 0.57, 0.01 ≤ D / H / FOV ≤ 0.015, 0.9 ≤ D / H / F ≤ 1.1, 0.1 ≤ BFL / TTL ≤ 0.18, 0.13 ≤ F / ENPD / D ≤ 0.18, and 0.09 ≤ (H / 2) / (F × tan(θ / 2)) ≤ 0.12; where TTL is the total optical length of the optical lens, F is the effective focal length of the optical lens, FOV is the maximum field of view angle of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, DMAX is the maximum clear aperture of the optical lens, θ is the radian value corresponding to the maximum field of view angle of the optical lens, D is the clear aperture corresponding to the maximum field of view angle on the first side of the first lens, BFL is the back focal length of the optical lens, and ENPD is the entrance pupil diameter of the optical lens.

19. The optical lens according to any one of claims 1 to 17, characterized in that, The optical lens satisfies at least one of the following relationships: -1.8 ≤ R8 / R7 ≤ -0.8, 0.65 ≤ F5 / F6 ≤ 1.85, -7.8 ≤ R10 / F ≤ -3, 3.3 ≤ R1 / R2 ≤ 5.5, -0.25 ≤ SAG10 / (D10 / 2) ≤ -0.05, 0.14 ≤ SAG11 / (D11 / 2) ≤ 0.41, 0 ≤ TAN(CRA) × BFL ≤ 0.2, -1.6 ≤ R5 / F2 ≤ -0.75, and 4 ≤ d34 / T45 ≤ 74; Wherein, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, R5 is the radius of curvature of the first side surface of the third lens, R7 is the radius of curvature of the first side surface of the fourth lens, R8 is the radius of curvature of the second side surface of the fourth lens, R10 is the radius of curvature of the second side surface of the fifth lens, F is the effective focal length of the optical lens, F2 is the effective focal length of the second lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, BFL is the back focal length of the optical lens, SAG10 is the sag of the second side surface of the fifth lens, SAG11 is the sag of the first side surface of the sixth lens, D10 is the clear aperture corresponding to the maximum field of view angle of the optical lens on the second side surface of the fifth lens, D11 is the clear aperture corresponding to the maximum field of view angle of the optical lens on the first side surface of the sixth lens, CRA is the incident angle of the chief ray of the maximum field of view of the optical lens on the imaging surface, d34 is the distance between the first side surface of the third lens and the second side surface of the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.

20. The optical lens according to any one of claims 1 to 17, characterized in that, The optical lens satisfies at least one of the following relational expressions: 10.6 ≤ TTL / F ≤ 11.5, 0.023 ≤ TTL / H / FOV ≤ 0.026, 1.8 ≤ TTL / DMAX ≤ 2.1, 0.49 ≤ (F×θ) / D ≤ 0.55, 0.012 ≤ D / H / FOV ≤ 0.014, 0.94 ≤ D / H / F ≤ 1.05, 0.12 ≤ BFL / TTL ≤ 0.17, 0.35 ≤ F / H ≤ 0.4, 0.14 ≤ F / ENPD / D ≤ 0.17, 0.1 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 0.11, -0.4 ≤ T56 / R10 ≤ -0.28, -11 ≤ F3 / F ≤ -7, -1.65 ≤ R8 / R7 ≤ -0.95, 0.9 ≤ (CT3 + CT4) / F4 ≤ 1.2, 0.9 ≤ F1 / F2 ≤ 1.3, -3.3 ≤ F1 / F ≤ -2.5, -3.3 ≤ F2 / F ≤ -2.5, 2 ≤ F4 / F ≤ 2.6, 3 ≤ F34 / F ≤ 5, 4.2 ≤ F5 / F ≤ 8.5, 4.5 ≤ F6 / F ≤ 6.2, 0.9 ≤ F5 / F6 ≤ 1.7, 2.4 ≤ F6 / T56 ≤ 4.1, -7 ≤ R10 / F ≤ -3.5, 3.8 ≤ R1 / R2 ≤ 5, -0.21 ≤ SAG10 / (D10 / 2) ≤ -0.09, 0.19 ≤ SAG11 / (D11 / 2) ≤ 0.36, 0.01 ≤ TAN(CRA)×BFL ≤ 0.16, 0.25 ≤ d34 / F5 ≤ 0.54, 5 ≤ d34 / T45 ≤ 64, and -1.4 ≤ R5 / F2 ≤ -0.9; Wherein, FOV is the maximum field of view angle of the optical lens, θ is the radian value corresponding to the maximum field of view angle of the optical lens, CRA is the incident angle of the chief ray of the maximum field of view of the optical lens on the imaging surface, F is the effective focal length of the optical lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, F34 is the combined focal length of the third lens and the fourth lens, BFL is the back focal length of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, TTL is the overall length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, DMAX is the maximum aperture of the optical lens, D is the aperture diameter corresponding to the maximum field of view angle of the optical lens on the first side of the first lens, D10 is the aperture diameter corresponding to the maximum field of view angle of the optical lens on the second side of the fifth lens, D11 is the aperture diameter corresponding to the maximum field of view angle of the optical lens on the first side of the sixth lens, R1 is the radius of curvature of the first side of the first lens, R2 is the radius of curvature of the second side of the first lens, R5 is the radius of curvature of the first side of the third lens, R7 is the radius of curvature of the first side of the fourth lens, R8 is the radius of curvature of the second side of the fourth lens, R10 is the radius of curvature of the second side of the fifth lens, CT3 is the central thickness of the third lens on the optical axis, CT4 is the central thickness of the fourth lens on the optical axis, SAG10 is the sagitta of the second side of the fifth lens, SAG11 is the sagitta of the first side of the sixth lens, d34 is the distance between the first side of the third lens and the second side of the fourth lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

21. An electronic device, characterized in that, An imaging element including the optical lens according to any one of claims 1 to 20 and configured to convert an optical image formed by the optical lens into an electrical signal.

Images