Optical lenses and electronic equipment

Abstract

The present application discloses an optical lens and an electronic device. The optical lens includes a first lens with negative optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with optical power and a sixth lens with optical power in sequence from the first side to the second side along the optical axis. The first side surface of the fourth lens is a convex surface, the first side surfaces of the fifth lens and the sixth lens are convex surfaces, and the second side surfaces are concave surfaces. The first lens, the second lens and the third lens are all meniscus lenses; the optical lens satisfies: 0.15≤R12 / TTL≤0.3 and ‑0.6≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤‑0.1, wherein R12 is the radius of curvature of the second side surface of the sixth lens, TTL is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis, 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, and F is the effective focal length of the optical lens.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to an optical lens and an electronic device. Background Art

[0002] In recent years, optical lens technology has continued to develop and progress. Optical lenses are increasingly widely used in many fields such as smart phones, security monitoring, car assisted driving, intelligent detection, and virtual reality. In the car's automatic driving assistance system, the lidar lens is a key component for detecting information around the car. With the rapid development of the car's automatic driving assistance system, the lidar lens has a development trend towards miniaturization, small aperture number (FNO), and high resolution.

[0003] Due to the high safety requirements of automobile driving assistance systems, in order to detect signals more accurately, the amount of light entering is usually increased by reducing the FNO, and the number of lenses is increased to improve image quality. However, this type of lens is relatively large in size and expensive, which is not conducive to miniaturization and cost reduction; this type of lens has a large FNO number and a small aperture, resulting in a small amount of light entering and low resolution. Summary of the invention

[0004] The first aspect of the present application provides an optical lens, which includes a first lens with negative optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with optical power, and a sixth lens with optical power in sequence from the first side to the second side along the optical axis. The first side surface of the fourth lens is convex, the first side surfaces of the fifth lens and the sixth lens are convex, and the second side surfaces are concave. The number of lenses with optical power in the optical lens is six. The first lens, the second lens and the third lens are all meniscus lenses; the optical lens satisfies: 0.15≤R12 / TTL≤0.3 and -0.6≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.1, wherein R12 is the radius of curvature of the second side surface of the sixth lens, TTL is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis, 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, and F is the effective focal length of the optical lens.

[0005] The second aspect of the present application provides an electronic device. The electronic device includes the optical lens provided according to the present application, and the electronic device also includes: at least one of an imaging element and a light source, wherein the imaging element is used to convert an optical image formed by the optical lens into an electrical signal, and the light emitted by the light source is projected onto a target area after passing through the optical lens to form an image or illuminate the area.

[0006] The optical lens provided by the present application adopts six lenses. By optimizing the shape, optical power, etc. of each lens, the first three lenses (the first lens to the third lens) are set as meniscus-shaped negative optical power lenses, so that the incident light is continuously and smoothly diffused, while increasing the light throughput of the optical system, reducing the pressure of imaging of subsequent lenses, which is conducive to better achieving high resolution and small FNO of the system; the fifth lens and the sixth lens are both convex and concave in shape, which play a role in continuously converging light, so that the light passing through the fourth lens is smoothly converged to the imaging surface, correcting the edge field aberration, reducing the sensitivity of the rear lens, and thus helping to improve the imaging quality; the present application The optical lens provided also satisfies 0.15≤R12 / TTL≤0.3 and -0.6≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.1, and controls the focal length values ​​of the first three lenses (the first lens, the second lens, and the third lens) so that the received light diffuses smoothly to the fourth lens, reducing the sensitivity of the light, which is conducive to achieving both a small aperture number (FNO) and high imaging quality. The sixth lens is the last side of the optical system, and its second side surface is concave, and the R12 value is small, which can make the diffusion of the light beam to be imaged be adjusted gently, reduce the angle of the light incident on the image plane, and thus improve the system resolution. The optical lens provided by the present application has at least one beneficial effect of miniaturization, small FNO, small distortion, high light flux, high resolution, and high performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. In the drawings:

[0008] Figure 1 A schematic structural diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0009] Figure 2 shows a modulation transfer function curve diagram of the optical lens according to Example 1 of the present application;

[0010] Figure 3 A schematic structural diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0011] Figure 4 A schematic structural diagram of an optical lens according to Embodiment 3 of the present application is shown;

[0012] Figure 5 A schematic structural diagram of an optical lens according to Embodiment 4 of the present application is shown;

[0013] Figure 6 shows a modulation transfer function curve diagram of the optical lens according to Example 4 of the present application;

[0014] Figure 7A schematic structural diagram of an optical lens according to Embodiment 5 of the present application is shown;

[0015] Figure 8 A schematic structural diagram of an optical lens according to Embodiment 6 of the present application is shown;

[0016] Fig. 9 A schematic structural diagram of an optical lens according to Embodiment 7 of the present application is shown;

[0017] Fig.10 A schematic structural diagram of an optical lens according to Example 8 of the present application is shown;

[0018] Fig.11 A schematic structural diagram of an optical lens according to Example 9 of the present application is shown;

[0019] Fig.12 shows a modulation transfer function curve diagram of the optical lens according to Example 9 of the present application;

[0020] Fig.13 A schematic structural diagram of an optical lens according to Embodiment 10 of the present application is shown;

[0021] Fig.14 A schematic structural diagram of an optical lens according to Example 11 of the present application is shown;

[0022] Fig.15 shows a modulation transfer function curve diagram of the optical lens according to Example 11 of the present application;

[0023] Fig.16 A schematic structural diagram of an optical lens according to Embodiment 12 of the present application is shown;

[0024] Fig.17 A schematic structural diagram of an optical lens according to Embodiment 13 of the present application is shown;

[0025] Fig.18 A schematic structural diagram of an optical lens according to Embodiment 14 of the present application is shown;

[0026] Fig.19 shows a modulation transfer function curve diagram of the optical lens according to Example 14 of the present application;

[0027] Fig. 20 A schematic structural diagram of an optical lens according to Embodiment 15 of the present application is shown;

[0028] Fig.21 A schematic structural diagram of an optical lens according to Example 16 of the present application is shown. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numbers refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0030] It should be noted that in this specification, the expressions of 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 teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0031] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0032] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the convex position 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 concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface type in the paraxial region can be judged according to the general method in the art, for example, the positive and negative R value (R refers to the radius of curvature of the paraxial region) is used to judge the concave and convex. Exemplarily, when the optical lens provided by the present application is used for photography, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens. In terms of the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; in terms of the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0033] It should be understood that the optical lens provided in the present application can be used for both video and projection, and can also be used for laser radar lenses. When the optical lens provided in the present application is used for a camera lens or a laser radar receiving end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the image side. The light from the object side can be imaged on the image side, for example, wherein the camera lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc.; when the optical lens provided in the present application is used for a projection lens or a radar transmitting end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the light source side. The light source side can provide light with or without image information. The light from the light source side passes through the optical lens and is projected to the first side, for example, forming an image or illuminating an area on the first side.

[0034] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0035] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] The features, principles and other aspects of the present application are described in detail below.

[0038] In an exemplary embodiment, the optical lens includes, for example, six lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are arranged in sequence from the first side to the second side along the optical axis.

[0039] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a vehicle-mounted lens. In this case, the first side of the optical lens can be the object side, and the second side can be the image side. Light from the object side can be imaged on the image side. The second side of the optical lens can be provided with an imaging surface of the optical lens. In this case, TTL is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis. For example, in the present application, Figure 1 Here, IMA can, for example, represent an imaging plane, TTL is the distance from the center of the first side surface (object side surface) of the first lens to the imaging plane IMA on the optical axis, and BFL is the distance from the center of the second side surface (image side surface) of the sixth lens to the imaging plane IMA on the optical axis.

[0040] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side surface. Optionally, the photosensitive element disposed on the second side surface may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0041] In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the first side of the optical lens can be the object side, and the second side can be the light source side. The light from the light source side passes through the optical lens and is projected to the object side. For example, an image can be formed or an illuminated area can be illuminated on the object side. The second side of the optical lens can be provided with a light source surface of the optical lens. In this case, TTL is the distance from the center of the first side surface of the first lens to the light source surface of the optical lens on the optical axis. For example, in the present application Figure 1 Here, IMA may represent the light source surface, for example, TTL is the distance from the center of the first side surface of the first lens to the light source surface IMA on the optical axis, and BFL is the distance from the center of the second side surface of the sixth lens to the light source surface IMA on the optical axis.

[0042] In an exemplary embodiment, the first lens has negative power, and its first side surface is concave and its second side surface is convex. The first lens has negative power and is shaped like a meniscus convex to the second side (image side), and the first side surface (object side) is concave, which is conducive to collecting sufficient light, increasing the amount of light passing, and diffusing the light to the rear. The first lens has negative power as a whole, which can achieve light diffusion, thereby increasing the optical path of the edge field of view, which is conducive to aberration correction.

[0043] In an exemplary embodiment, the first lens has negative optical power, and its first side surface is convex and its second side surface is concave. The first lens has negative optical power and is in the shape of a meniscus convex to the first side (object side). The first side surface (object side) of the first lens is convex, which is conducive to converging the light beam, so that the diameter of the received light beam is reduced, thereby reducing the lens size of the second lens to the sixth lens, and ultimately conducive to miniaturization and low cost of the system; the second side surface (image side) is concave, which is conducive to smoothly incident light into the system for imaging, ensuring that the edge light trend is not steep, and is conducive to improving the resolution of the system.

[0044] In an exemplary embodiment, the second lens has negative optical power, and its first side surface is concave and its second side surface is convex. The second lens has negative optical power, and cooperates with the first lens having negative optical power, which is conducive to reducing sensitivity and improving resolution. The first side surface (object side) of the second lens is concave, which further diffuses the light in front, gradually increases the beam diameter, and further increases the light throughput of the system, which is conducive to achieving a small aperture number FNO; the second side surface (image side) of the second lens is convex, which can adjust the trend of the light diffused in front and make it slightly smoother, which is conducive to correcting the aberration of the edge field of view and achieving high resolution of the system.

[0045] In an exemplary embodiment, the second lens has negative optical power, and its first side surface is convex and its second side surface is concave. The second lens has negative optical power, and cooperates with the first lens having negative optical power, which is conducive to reducing sensitivity and improving resolution. The first side surface (object side) of the second lens is convex, and the diffused light beam from the first lens is slightly converged and adjusted, which can not only adjust the light trend, but also reduce the aperture of the subsequent third lens to the sixth lens when matched with the first lens, thereby achieving low cost. The second side surface (image side) of the second lens is concave, which further diffuses the light beam, thereby increasing the light flux of the system, further realizing the high light flux of the system, and facilitating the realization of a small aperture number FNO.

[0046] In an exemplary embodiment, the third lens has negative optical power, and its first side surface is concave and the second side surface is convex. The third lens has negative optical power and cooperates with the first lens and the second lens having negative optical power. Among them, the first side surface (object side surface) is a concave surface, which further diffuses the light beam diffused by the first lens and the second lens, thereby further increasing the light flux of the system and achieving a small FNO; the second side surface (image side surface) of the third lens is a convex surface, which forms a meniscus shape with the first side surface (object side surface), and the gradually diffused light beam is eased, and the edge field of view light trend will not be steep, which is conducive to correcting the edge field of view aberration and achieving high resolution of the system. Furthermore, the first three lenses (the first lens to the third lens) are all meniscus-shaped negative optical power lenses, which make the incident light continue and diffuse smoothly, while increasing the light flux of the optical system, reducing the pressure of subsequent lens imaging, which is conducive to better achieving high resolution and small FNO of the system.

[0047] In an exemplary embodiment, the third lens has negative power, and its first side surface is convex and its second side surface is concave. The third lens has negative power, and its first side surface (object side surface) is convex. The light beams diffused by the first lens and the second lens are slightly converged and adjusted, and the light trend can be adjusted to be slightly gentle, thereby alleviating the resolution pressure of the subsequent third lens to the sixth lens on the edge field of view; the second side surface (image side surface) of the third lens is concave, which further diffuses the light beam, thereby increasing the light flux of the system, further realizing the high light flux of the system, and facilitating the realization of a small FNO. Furthermore, the first three lenses (the first lens to the third lens) are all meniscus-shaped negative power lenses, which make the incident light continue and diffuse smoothly, while increasing the light flux of the optical system, reducing the pressure of imaging of subsequent lenses, which is conducive to better realizing the high resolution and small FNO of the system.

[0048] In an exemplary embodiment, the fourth lens has positive optical power, and its first side surface is convex and the second side surface is concave. The fourth lens has positive optical power, and performs optical power compensation with the first lens, the second lens and the third lens having negative optical power. The light beam diffused and increased by the first lens, the second lens and the third lens is sufficient to achieve high luminous flux and small FNO of the system. Therefore, the first side surface (object side) of the fourth lens is convex to the first side (object side), and the light beam diffused by the first lens, the second lens and the third lens is converged and converged, and the system convergence imaging is started. The combination of positive and negative optical power is conducive to achieving high resolution of the system; the second side surface (image side) of the fourth lens is concave to the second side (image side), and the light beam that converges sharply in front is eased, so that the edge field of view light beam moves smoothly, which is conducive to correcting the edge field of view aberration.

[0049] In an exemplary embodiment, the fourth lens has positive power, and its first side surface is convex, and its second side surface is convex. The fourth lens has positive power and is biconvex in shape. Both sides can converge the front light beam and adjust the light trend. The second side surface is also convex, which reduces the resolution pressure of the first side surface and prevents the first side surface from being too curved. An overly curved convex surface may cause the edge field light beam to trend steeply, which is not conducive to resolution.

[0050] In an exemplary embodiment, the fifth lens has negative optical power, and its first side surface is convex and its second side surface is concave. The fifth lens has negative optical power, appropriately diverges light, and makes the light transition smoothly, which is conducive to reducing sensitivity and improving imaging quality; the first side surface (object side surface) of the fifth lens is convex, which further converges the front light beam, not only can achieve system resolution, but also can reduce the aperture of the sixth lens, thereby achieving miniaturization; the second side surface (image side surface) of the fifth lens is concave, which smoothes the trend of the front light, is conducive to correcting the aberration of the edge field of view, and improves the system resolution.

[0051] In an exemplary embodiment, the fifth lens has positive power, and its first side surface is convex and its second side surface is concave. The fifth lens has positive power, and the first lens, the second lens and the third lens have negative power. The fifth lens cooperates with the fourth lens with positive power to converge the light beam again and reduce the resolution pressure of the fourth lens; the first side surface (object side surface) of the fifth lens is convex, which further converges the front light beam, not only can achieve system resolution, but also can reduce the aperture of the subsequent sixth lens, thereby achieving miniaturization; the second side surface (image side surface) of the fifth lens is concave, which smoothes the trend of the front light, is conducive to correcting the aberration of the edge field of view, and improves the system resolution.

[0052] In an exemplary embodiment, the sixth lens has positive focal length, and its first side surface is convex, and its second side surface is concave. The sixth lens has positive focal length, and cooperates with the fourth lens and the fifth lens to further converge the light beam, so that the light beam smoothly transitions to the imaging surface, reduces the sensitivity of the lens, and improves the resolution; the first side surface (object side) of the sixth lens is convex, which is conducive to collecting the edge field light, thereby increasing the luminous flux and focusing the light beam to the image plane; the second side surface (image side) of the sixth lens is concave, and the shape of the sixth lens is a meniscus, which cooperates with the fourth lens and the fifth lens, and can also make the final trend of the front light beam smooth, so as to finally achieve the high resolution of the system.

[0053] In an exemplary embodiment, the sixth lens has negative optical power, and its first side surface is convex and its second side surface is concave. The sixth lens has negative optical power, collects the light entering through the fourth lens and the fifth lens, and makes the light trend transition smoothly, which is conducive to improving the resolution; the first side surface (object side) of the sixth lens is convex, which is conducive to collecting the edge field light, thereby increasing the luminous flux and focusing the light to the image plane. The second side surface (image side) of the sixth lens is concave, which can make the imaging beam trend smooth, while improving the system resolution, it can also reduce the angle of the incident image plane of each field of view main light, and ultimately improve the chip response capability.

[0054] In an exemplary embodiment, the sixth lens is an aspherical lens, and the aspherical surface is conducive to correcting the edge field aberration, thereby improving the resolution of the edge field light, and finally ensuring the high resolution of the system under the whole field of view. The sixth lens is set as an aspherical surface, so that various aberrations of the optical system can be fully corrected, and the optical performance such as resolution, distortion, and CRA can be improved under the premise of compact structure.

[0055] In an exemplary embodiment, the fifth lens and the sixth lens are both aspherical mirror surfaces. The curvature of each position of the aspherical surface is different, which is beneficial to correcting system aberrations and field curvature and improving the resolution of the optical system.

[0056] In an exemplary embodiment, an aperture for limiting the light beam may be provided between the fourth lens and the fifth lens. However, it should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in an alternative embodiment, the aperture may also be provided at other positions according to actual needs.

[0057] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.15≤R12 / TTL≤0.3, wherein R12 is the radius of curvature of the second side surface of the sixth lens, and TTL is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis. More specifically, R12 and TTL may further satisfy: 0.17≤R12 / TTL≤0.22. When 0.15≤R12 / TTL≤0.3 is satisfied, the second side surface of the sixth lens is a concave surface, and is the last surface of the optical system, and the R12 value is small, which can make the diffusion of the light beam to be imaged be adjusted to ease the diffusion, reduce the angle of the light incident on the image plane, and thus improve the system resolution.

[0058] In an exemplary embodiment, the optical lens according to the present application may satisfy: -0.6≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.1, wherein 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, and F is the effective focal length of the optical lens. More specifically, F1, F2, F3, and F may further satisfy: -0.5≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.2. Satisfying -0.6≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.1, the optical power distribution of the first three lenses (the first lens, the second lens, and the third lens) is controlled, so that the received light is smoothly diffused to the fourth lens, reducing the sensitivity of the light, which is conducive to achieving both small FNO and high imaging quality. In particular, when the lens is applied to a laser radar system, the detection distance and detection accuracy can be improved.

[0059] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.2≤TTL / H / FOV×1°≤0.33, wherein TTL is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. More specifically, TTL, H, and FOV may further satisfy: 0.23≤TTL / H / FOV×1°≤0.3. Satisfying 0.2≤TTL / H / FOV×1°≤0.33 effectively limits the length of the lens and realizes miniaturization of the lens.

[0060] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.05≤D / H / FOV×1°≤0.15, wherein D is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. More specifically, D, H, and FOV may further satisfy: 0.07≤D / H / FOV×1°≤0.12. Satisfying 0.05≤D / H / FOV×1°≤0.15 is conducive to achieving a small front-end aperture and miniaturization of the lens.

[0061] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.12 mm -1 ≤D / H / F≤0.25mm -1 , where D is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and F is the effective focal length of the optical lens. More specifically, D, H and F may further satisfy: 0.14 mm -1 ≤D / H / F≤0.22 mm -1 . Meet 0.12 mm -1 ≤D / H / F≤0.25 mm -1 , under the condition of fixed focal length, it can provide the lens with the characteristics of large target surface and small aperture.

[0062] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.01 mm -1 ≤F / ENPD / D≤0.06 mm -1 , 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 maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens. More specifically, F, ENPD and D may further satisfy: 0.02 mm -1 ≤F / ENPD / D≤0.05 mm -1 . Meet 0.01 mm -1 ≤F / ENPD / D≤0.06 mm -1 , while ensuring high light throughput, ensuring small aperture and realizing miniaturization of the lens.

[0063] In an exemplary embodiment, the optical lens according to the present application may satisfy: 3≤TTL / F≤6, wherein TTL is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis, and F is the effective focal length of the optical lens. More specifically, TTL and F may further satisfy: 4≤TTL / F≤5. Satisfying 3≤TTL / F≤6 effectively limits the length of the lens and realizes miniaturization of the lens.

[0064] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1.5≤F / H≤2.3, where F is the effective focal length of the optical lens, and H is the image height corresponding to the maximum field angle of the optical lens. More specifically, F and H may further satisfy: 1.7≤F / H≤1.9. Satisfying 1.5≤F / H≤2.3 and controlling the focal length and image height within a certain range helps the optical lens have a large image plane and telephoto characteristics, which is beneficial to improving resolution.

[0065] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.85≤(H / 2) / (F×tan(θ / 2))≤1.1, wherein H is the image height corresponding to the maximum field angle of the optical lens, F is the effective focal length of the optical lens, and θ is the radian value corresponding to the maximum field angle of the optical lens. More specifically, H, F, and θ may further satisfy: 0.92≤(H / 2) / (F×tan(θ / 2))≤1. Satisfying 0.85≤(H / 2) / (F×tan(θ / 2))≤1.1 can control the ratio of the actual image height to the ideal image height within a suitable range, achieve smaller optical distortion, and facilitate achieving high resolution of the system.

[0066] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.03≤ENPD / H / FOV×1°≤0.11, wherein ENPD is the entrance pupil diameter of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. More specifically, ENPD, H, and FOV may further satisfy: 0.05≤ENPD / H / FOV×1°≤0.09. Satisfying 0.03≤ENPD / H / FOV×1°≤0.11 and controlling the entrance pupil diameter to be larger will help the system achieve high luminous flux and small FNO, thereby helping the optical lens to better capture objects at a long distance.

[0067] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.2≤R3 / R4≤3, wherein R3 is the radius of curvature of the first side surface of the second lens, and R4 is the radius of curvature of the second side surface of the second lens. More specifically, R3 and R4 may further satisfy: 0.48≤R3 / R4≤2.43. When 0.2≤R3 / R4≤3 is satisfied, the surface of the second lens is set in a meniscus shape, which is conducive to the smooth diffusion of light to the third lens, reducing the sensitivity of the system and improving the imaging performance.

[0068] In an exemplary embodiment, the optical lens according to the present application can satisfy: F3 / F≤-8, where F3 is the effective focal length of the third lens, and F is the effective focal length of the optical lens. More specifically, F3 and F can further satisfy: -23≤F3 / F≤-10. Satisfying F3 / F≤-8, the focal length of the third lens is reasonably allocated, the third lens is a negative film and has a large focal length, which can make the light from the first lens and the second lens in front of the diffused light smoothly transition and further diffuse, thereby increasing the amount of light entering the system, and finally achieving a small FNO. In an exemplary embodiment, the third lens is a meniscus shape, and the curvature radius of the first side and the second side can have a trend of approaching, and the value of F3 can tend to infinity. The third lens with negative optical power of the present application can be obtained by reasonable design. For example, in multiple embodiments of the present application, the effective focal length F3 of the third lens has an absolute value exceeding 100mm. At this time, the ability of the third lens to diverge light is slightly weak, and it can mainly play the role of smoothly transitioning light.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy: F2 / F≤-4, wherein F2 is the effective focal length of the second lens, and F is the effective focal length of the optical lens. More specifically, F2 and F may further satisfy: -18≤F2 / F≤-5. Satisfying F2 / F≤-4, the focal length of the second lens is reasonably allocated, and the second lens is a negative lens with a large focal length, which can make the light that has diffused in front smoothly transition and further diffuse, thereby increasing the amount of light entering the system and ultimately achieving a small FNO. The second lens cooperates with the first lens and the third lens with negative optical power to reduce the sensitivity of the first three lenses (the first lens to the third lens), which is beneficial to ensure a small FNO while improving the imaging quality. In an exemplary embodiment, the second lens is a meniscus shape, and the curvature radii of the first side and the second side thereof may have a tendency to be close, and the value of F2 may tend to infinity. The second lens with negative optical power of the present application can be obtained by reasonable design. For example, in many embodiments of the present application, the effective focal length F2 of the third lens is greater than 100 mm in absolute value. At this time, the ability of the second lens to diverge light is slightly weaker, and it can mainly play the role of smoothly transitioning light.

[0070] In an exemplary embodiment, the optical lens according to the present application may satisfy: -15≤F1 / F≤-2, where F1 is the effective focal length of the first lens and F is the effective focal length of the optical lens. More specifically, F1 and F may further satisfy: -12≤F1 / F≤-3. Satisfying -15≤F1 / F≤-2, rationally controlling the focal length of the first lens, initially diffusing the light beam, and gradually increasing the beam diameter is conducive to achieving high luminous flux and small FNO of the system, while the light beam has a smooth transition, which is conducive to improving the resolution.

[0071] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤F4 / F≤4.5, wherein F4 is the effective focal length of the fourth lens, and F is the effective focal length of the optical lens. More specifically, F4 and F may further satisfy: 1.2≤F4 / F≤4. When 1≤F4 / F≤4.5 is satisfied, the focal length of the fourth lens is a positive value, and the focal length is small, and the first lens, the second lens, and the third lens with negative optical power are used for optical power compensation, and the light beams diffused by the first lens, the second lens, and the third lens are converged and converged, and system convergence imaging is started, which is conducive to reducing the diameter of the back port.

[0072] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.4≤F3 / F2≤3, wherein F2 is the effective focal length of the second lens, and F3 is the effective focal length of the third lens. More specifically, F3 and F2 may further satisfy: 0.6≤F3 / F2≤2.6. Satisfying 0.4≤F3 / F2≤3, the second lens and the third lens are both negative focal lenses, and the focal lengths are not much different. The second lens is responsible for quickly diffusing the light beam to increase the amount of light entering the system. The subsequent third lens further diffuses the light beam slightly to achieve a small FNO of the system, and the light trend will not be very steep, which is conducive to correcting the edge field aberration and achieving high resolution.

[0073] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.2≤(1 / F5+1 / F6) / (1 / F)≤0.75, wherein F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, and F is the effective focal length of the optical lens. More specifically, F5, F6, and F may further satisfy: 0.3≤(1 / F5+1 / F6) / (1 / F)≤0.65. Satisfying 0.2≤(1 / F5+1 / F6) / (1 / F)≤0.75, by adjusting the focal length ratio of the rear lens group (fifth lens and sixth lens) in the entire system, the residual aberration of the front lens group system (first lens to fourth lens) can be effectively supplemented, which helps to improve the imaging quality of the entire optical system. Furthermore, in combination with the fifth lens and the sixth lens being both convex and concave in shape, the light rays are continuously converged, so that the light rays converge smoothly to the imaging surface, the edge field aberration is corrected, and the sensitivity of the rear lens is reduced, which is conducive to improving the imaging quality.

[0074] In an exemplary embodiment, the optical lens according to the present application may satisfy: T45 / TTL≤0.1, wherein T45 is the air gap between the fourth lens and the fifth lens on the optical axis, and TTL is the distance between the center of the first side surface of the first lens and the imaging surface of the optical lens on the optical axis. More specifically, T45 and TTL may further satisfy: 0.001≤T45 / TTL≤0.06. By satisfying T45 / TTL≤0.1, the proportion of the air gap between the fourth lens and the fifth lens in the total length of the optical lens is controlled to be relatively small, ensuring a smooth transition and divergence of light while making the fourth lens and the fifth lens compactly arranged in the system, which is conducive to miniaturization of the system.

[0075] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.2≤R11 / (R12+CT6)≤1, wherein R11 is the radius of curvature of the first side surface of the sixth lens, R12 is the radius of curvature of the second side surface of the sixth lens, and CT6 is the center thickness of the sixth lens on the optical axis. More specifically, R11, R12, and CT6 may further satisfy: 0.3≤R11 / (R12+CT6)≤0.9. Satisfying 0.2≤R11 / (R12+CT6)≤1, the sixth lens is controlled to be a meniscus lens, convex to the first side (object side), and the center thickness of the sixth lens is controlled. The radius of curvature of the first side surface and the second side surface of the sixth lens are relatively close, and in cooperation with the fifth lens, the final trend of the front light beam is eased, thereby ultimately achieving high resolution of the system. Furthermore, when the sixth lens is a convex-concave aspherical lens, the radius of curvature of the lens changes trendwise from the center to the edge, which can control the light trend of the edge field of view, balance the aberrations of the lenses in each field of view, and improve the imaging quality.

[0076] In an exemplary embodiment, the optical lens according to the present application may satisfy: 54°≤(FOV×F) / H≤63°, wherein FOV is the maximum field of view angle of the optical lens, 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. More specifically, FOV, F, and H may further satisfy: 56°≤(FOV×F) / H≤61°. Satisfying 54°≤(FOV×F) / H≤63° can satisfy a higher angular resolution (when the chip pixel size is constant, the larger the chip size means the larger the image height H, the higher the angular resolution, that is, the angular resolution and the image height H are positively correlated), which is beneficial to improving the system resolution.

[0077] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.3≤R5 / R6≤2.5, wherein R5 is the radius of curvature of the first side of the third lens, and R6 is the radius of curvature of the second side of the third lens. More specifically, R5 and R6 may further satisfy: 0.5≤R5 / R6≤2. When 0.3≤R5 / R6≤2.5 is satisfied, the third lens is a meniscus shape, and the radius of curvature of the first side (object side) and the second side (image side) of the third lens are controlled to be relatively close, so that the third lens can collect more light while adjusting the light trend to be smooth, increase the light transmission capacity of the system, and relieve the resolution pressure of the subsequent fourth to sixth lenses on the edge field of view.

[0078] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.05≤BFL / TTL≤0.18, wherein BFL is the optical back focus of the optical lens, and TTL is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis. More specifically, BFL and TTL may further satisfy: 0.06≤BFL / TTL≤0.15. Satisfying 0.05≤BFL / TTL≤0.18 has the characteristics of short back focus, and under the premise of ensuring the installation and focusing space of the optical elements, the incident angle of the main light of the image plane can be made smaller, thereby ensuring the response of the chip and realizing the miniaturization of the system.

[0079] In an exemplary embodiment, the optical lens according to the present application may satisfy: 0.6≤F / ENPD≤1.5, where F is the effective focal length of the optical lens and ENPD is the entrance pupil diameter of the optical lens. More specifically, F and ENPD may further satisfy: 0.7≤F / ENPD≤1.2. Satisfying 0.6≤F / ENPD≤1.5 and achieving a small FNO is beneficial to increasing the amount of light and the entrance pupil diameter, which helps to improve the relative illumination, and thus is more conducive to achieving long-distance detection.

[0080] In an exemplary embodiment, the optical lens according to the present application may satisfy: |F / F5|≤0.6, wherein F is the effective focal length of the optical lens, and F5 is the effective focal length of the fifth lens. More specifically, F and F5 may further satisfy: 0.05≤|F / F5|≤0.44. Satisfying |F / F5|≤0.6 and reasonably controlling the ratio of the effective focal length of the optical lens to the effective focal length of the fifth lens is conducive to reasonably controlling the degree of deflection of light, correcting the aberration of the optical lens, and reducing sensitivity; further, the fifth lens is matched with the fourth lens having positive focal power, so that the light passing through the fifth lens maintains a convergence trend, and is matched with the convex-concave shape of the sixth lens, so that the light can continue to converge, balance the aberration of the optical lens, and improve the imaging quality. Furthermore, the conditional formula |F / F5|≤0.6 is matched with the conditional formula 0.05≤BFL / TTL≤0.18, which is also conducive to miniaturization and small aperture at the rear end.

[0081] In an exemplary embodiment, the optical lens according to the present application may satisfy: 1≤(R9+R11) / F≤3.2, wherein R9 is the radius of curvature of the first side of the fifth lens, R11 is the radius of curvature of the first side of the sixth lens, and F is the effective focal length of the optical lens. More specifically, R9, R11 and F may further satisfy: 1.4≤(R9+R11) / F≤2.8. When 1≤(R9+R11) / F≤3.2 is satisfied, the first side of the fifth lens and the first side of the sixth lens are both convex, and the radius of curvature is relatively small, which is conducive to the convergence of light rays for imaging and miniaturization. At the same time, when the light rays pass through the fifth lens and are incident on the sixth lens, the light rays are not deflected to a large extent and the trend is relatively stable, which is conducive to reducing the resolution pressure of the fifth lens and the sixth lens and achieving high resolution.

[0082] In an exemplary embodiment, the optical lens according to the present application may satisfy: 4≤R12 / SAG12≤16, wherein R12 is the radius of curvature of the second side of the sixth lens, and SAG12 is the distance from the intersection of the second side of the sixth lens and the optical axis to the vertex of the effective radius of the second side of the sixth lens on the optical axis. More specifically, R12 and SAG12 may further satisfy: 5.4≤R12 / SAG12≤13.5. Satisfying 4≤R12 / SAG12≤16, the second side of the sixth lens is a concave surface, and the ratio of the radius of curvature and the loss height of the second side of the sixth lens is reasonably controlled, which is conducive to controlling the final light trend of the lens, allowing the light to converge smoothly to the imaging surface, and achieving high resolution of the lens.

[0083] MTF stands for modulation transfer function, which describes the ability of an optical system to "restore" the object side on the image side. The horizontal axis of the modulation transfer function (MTF) curve is the spatial frequency, and the unit of the spatial frequency is line pairs per millimeter (lp / mm). The vertical axis is the optical modulation function value (i.e., MTF value). The MTF curve of the optical lens provided in this application has an MTF value of the edge field of view of 50 lp / mm and is above 0.45, which can meet the required image quality requirements.

[0084] It should be noted that the optical lenses provided in Examples 1 to 16 of the present application can all achieve good imaging quality, and their modulation transfer function (MTF) curves are relatively close. Therefore, the present application only exemplarily shows the modulation transfer function (MTF) curves of Examples 1, 4, 8, 9, 11 and 14, and the modulation transfer function (MTF) curves of other embodiments are no longer shown one by one, and those skilled in the art should be able to know them based on the contents disclosed in this application.

[0085] In an exemplary embodiment, the aperture number FNO of the optical lens according to the present application may be in the range of 0.7 to 1.1.

[0086] In an exemplary embodiment, as needed, the optical lens of the present application may further include a filter and / or a protective glass disposed between the sixth lens and the imaging surface, the filter may filter light with different wavelengths, and the protective glass may prevent the elements (e.g., chip) on the second side of the optical lens from being damaged.

[0087] In an exemplary embodiment, the first lens to the sixth lens may be a spherical lens or an aspherical lens. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased, and even all lenses use aspherical lenses. In some embodiments, the sixth lens of the present application is an aspherical lens. In other embodiments, the fifth lens and the sixth lens of the present application are aspherical lenses. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. The setting of an aspherical lens helps to correct system aberrations and improve resolution.

[0088] In an exemplary embodiment, the first to sixth lenses may be glass lenses or plastic lenses. The present application does not specifically limit the specific number of glass lenses and plastic lenses. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve the stability of the system. At the same time, the use of glass material can avoid problems such as lens imaging blur caused by high and low temperature changes in the use environment and affecting the normal use of the lens. Specifically, when focusing on temperature performance, the first to sixth lenses can all be made of glass. In applications where temperature stability requirements are lower, the first to sixth lenses in the optical lens can also be made of plastic. Making optical lenses with plastic can effectively reduce production costs. Of course, the first to sixth lenses in the optical lens can also be made of a combination of plastic and glass.

[0089] According to the above-mentioned embodiment of the present application, the optical lens can have at least one beneficial effect of miniaturization, small FNO, small distortion, high light throughput, high resolution and high performance by reasonably setting parameters such as lens shape and optical focal length.

[0090] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present application, the number of lenses constituting the 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. The specific embodiments of the optical lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0091] Example 1

[0092] The following reference Figure 1 An optical lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0093] like Figure 1 As shown, the optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 in sequence from the first side to the second side along the optical axis.

[0094] The first lens L1 is a meniscus lens with negative focal power, whose first side surface S1 is concave, and whose second side surface S2 is convex. The second lens L2 is a meniscus lens with negative focal power, whose first side surface S3 is concave, and whose second side surface S4 is convex. The third lens L3 is a meniscus lens with negative focal power, whose first side surface S5 is concave, and whose second side surface S6 is convex. The fourth lens L4 is a meniscus lens with positive focal power, whose first side surface S7 is convex, and whose second side surface S8 is concave. The fifth lens L5 is a meniscus lens with negative focal power, whose first side surface S9 is convex, and whose second side surface S10 is concave. The sixth lens L6 is a meniscus lens with positive focal power, whose first side surface S11 is convex, and whose second side surface S12 is concave.

[0095] The optical lens may further include a stop STO, and the stop STO may be disposed between the fourth lens L4 and the fifth lens L5.

[0096] Optionally, the optical lens may further include a filter L7 having a first side surface S13 and a second side surface S14 and / or a protective glass having a first side surface S15 and a second side surface S16.

[0097] Table 1 shows the radius of curvature R, thickness / distance (it should be understood that the thickness / distance of the row where S1 is located is the center thickness of the first lens L1, the thickness / distance of the row where S2 is located is the spacing distance between the second side surface S2 of the first lens L1 and the first side surface S3 of the second lens L2, the thickness / distance of the row where S3 is located is the center thickness of the second lens L2, and so on), refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 1.

[0098] Table 1

[0099]

[0100] In Embodiment 1, the first side surface S9 and the second side surface S10 of the fifth lens L5 and the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces, and the surface shape of each aspherical lens may be defined by, but not limited to, the following aspherical surface formula:

[0101] (1)

[0102] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical mirror surface S9, S10, S11, S12 in Example 1.

[0103] Table 2

[0104]

[0105] The optical lens provided in Example 1 has an aperture number FNO of 0.7, which has the characteristic of a large aperture. Figure 2 The modulation transfer function (MTF) curve of the optical lens of Example 1 is shown. When the spatial frequency is 50lp / mm, the MTF peak value of the edge field of view of the optical lens can reach above 0.45, and high resolution can be achieved.

[0106] Example 2

[0107] The following reference Figure 3 The optical lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 FIG. 2 shows a schematic diagram of the structure of an optical lens according to Embodiment 2 of the present application. Figure 3 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be obtained according to the data in Table 3, and no further description is given. Table 3 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 2.

[0108] Table 3

[0109]

[0110] In Example 2, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 4 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0111] Table 4

[0112]

[0113] The optical lens provided in Example 2 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.65 when the spatial frequency is 50lp / mm, and high resolution can be achieved.

[0114] Example 3

[0115] Figure 4 FIG. 2 shows a schematic diagram of the structure of an optical lens according to Embodiment 3 of the present application. Figure 4 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be known according to the data in Table 5, and no further description is given. Table 5 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 3.

[0116] Table 5

[0117]

[0118] In Example 3, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 6 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0119] Table 6

[0120]

[0121] The optical lens provided in Example 3 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.66 when the spatial frequency is 50lp / mm, and high resolution can be achieved.

[0122] Example 4

[0123] Figure 5 FIG. 4 shows a schematic diagram of the structure of an optical lens according to Embodiment 4 of the present application. Figure 5 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be known according to the data in Table 7, and no further description is given. Table 7 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 4.

[0124] Table 7

[0125]

[0126] In Example 4, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 8 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0127] Table 8

[0128]

[0129] The optical lens provided in Example 4 has an aperture number FNO of 0.9, which is a characteristic of a large aperture. Figure 6 The modulation transfer function (MTF) curve of the optical lens of Example 4 is shown. When the spatial frequency is 50lp / mm, the MTF peak value of the edge field of view of the optical lens can reach above 0.81, and high resolution can be achieved.

[0130] Example 5

[0131] Figure 7 FIG. 5 shows a schematic diagram of the structure of an optical lens according to Embodiment 5 of the present application. Figure 7As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be known according to the data in Table 9, which will not be repeated. Table 9 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 5.

[0132] Table 9

[0133]

[0134] In Example 5, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 10 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0135] Table 10

[0136]

[0137] The optical lens provided in Example 5 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.63 when the spatial frequency is 50lp / mm, and high resolution can be achieved.

[0138] Example 6

[0139] Figure 8 FIG. 4 shows a schematic diagram of the structure of an optical lens according to Embodiment 6 of the present application. Figure 8 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with negative optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be known according to the data in Table 11, and no further description is given. Table 11 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 6.

[0140] Table 11

[0141]

[0142] In Example 6, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 12 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0143] Table 12

[0144]

[0145] The optical lens provided in Example 6 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.68 when the spatial frequency is 50lp / mm, and can achieve high resolution.

[0146] Example 7

[0147] Fig. 9 FIG. 2 shows a schematic diagram of the structure of an optical lens according to Embodiment 7 of the present application. Fig. 9 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with negative optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be obtained according to the data in Table 13, which will not be repeated. Table 13 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 7.

[0148] Table 13

[0149]

[0150] In Example 7, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 14 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0151] Table 14

[0152]

[0153] The optical lens provided in Example 7 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.59 when the spatial frequency is 50lp / mm, and high resolution can be achieved.

[0154] Example 8

[0155] Fig.10FIG. 8 shows a schematic diagram of the structure of an optical lens according to Example 8 of the present application. Fig.10 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with negative optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be obtained according to the data in Table 15, which will not be repeated. Table 15 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 8.

[0156] Table 15

[0157]

[0158] In Example 8, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 16 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 8, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0159] Table 16

[0160]

[0161] The optical lens provided in Example 8 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.61 when the spatial frequency is 50lp / mm, and high resolution can be achieved.

[0162] Example 9

[0163] Fig.11 FIG. 4 shows a schematic diagram of the structure of an optical lens according to Example 9 of the present application. Fig.11 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with negative optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be known according to the data in Table 17, and no further description is given. Table 17 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 9.

[0164] Table 17

[0165]

[0166] In Example 9, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 18 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 9, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0167] Table 18

[0168]

[0169] The optical lens provided in Example 9 has an aperture number FNO of 0.9, which is a characteristic of a large aperture. Fig.12 The modulation transfer function (MTF) curve of the optical lens of Example 9 is shown. When the spatial frequency is 50lp / mm, the MTF peak value of the edge field of view of the optical lens can reach above 0.79, which can achieve high resolution.

[0170] Example 10

[0171] Fig.13 FIG. 1 shows a schematic diagram of the structure of an optical lens according to Embodiment 10 of the present application. Fig.13 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with negative optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be known according to the data in Table 19, which will not be repeated. Table 19 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 10.

[0172] Table 19

[0173]

[0174] In Example 10, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 20 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 10, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0175] Table 20

[0176]

[0177] The optical lens provided in Example 10 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.57 when the spatial frequency is 50lp / mm, and high resolution can be achieved.

[0178] Embodiment 11

[0179] Fig.14 FIG. 1 shows a schematic diagram of the structure of an optical lens according to Example 11 of the present application. Fig.14 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be obtained according to the data in Table 21, and no further description is given. Table 21 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 11.

[0180] Table 21

[0181]

[0182] In Example 11, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 22 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 11, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0183] Table 22

[0184]

[0185] The optical lens provided in Example 11 has an aperture number FNO of 0.9, which is a characteristic of a large aperture. Fig.15 The modulation transfer function (MTF) curve of the optical lens of Example 11 is shown. When the spatial frequency is 50lp / mm, the MTF peak value of the edge field of view of the optical lens can reach above 0.71, and high resolution can be achieved.

[0186] Example 12

[0187] Fig.16 FIG. 1 shows a schematic diagram of the structure of an optical lens according to Example 12 of the present application. Fig.16 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be obtained according to the data in Table 23, and no further description is given. Table 23 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 12.

[0188] Table 23

[0189]

[0190] In Example 12, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 24 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 12, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0191] Table 24

[0192]

[0193] The optical lens provided in Example 12 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.69 when the spatial frequency is 50lp / mm, and can achieve high resolution.

[0194] Example 13

[0195] Fig.17 FIG. 1 shows a schematic diagram of the structure of an optical lens according to Example 13 of the present application. Fig.17 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be obtained according to the data in Table 25, and will not be repeated here. Table 25 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 13.

[0196] Table 25

[0197]

[0198] In Example 13, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 26 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 13, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0199] Table 26

[0200]

[0201] The optical lens provided in Example 13 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.66 when the spatial frequency is 50lp / mm, and high resolution can be achieved.

[0202] Embodiment 14

[0203] Fig.18 FIG. 1 shows a schematic diagram of the structure of an optical lens according to Embodiment 14 of the present application. Fig.18 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be obtained according to the data in Table 27, which will not be repeated. Table 27 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 14.

[0204] Table 27

[0205]

[0206] In Example 14, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 28 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 14, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0207] Table 28

[0208]

[0209] The optical lens provided in Example 14 has an aperture number FNO of 1.1, which has the characteristic of a large aperture. Fig.19 The modulation transfer function (MTF) curve of the optical lens of Example 14 is shown. When the spatial frequency is 50lp / mm, the MTF peak value of the edge field of view of the optical lens can reach above 0.82, and high resolution can be achieved.

[0210] Embodiment 15

[0211] Fig. 20 FIG. 1 shows a schematic diagram of the structure of an optical lens according to Embodiment 15 of the present application. Fig. 20 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be obtained according to the data in Table 29, which will not be repeated. Table 29 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 15.

[0212] Table 29

[0213]

[0214] In Example 15, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 30 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 15, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0215] Table 30

[0216]

[0217] The optical lens provided in Example 15 has an aperture number FNO of 1.1, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.72 when the spatial frequency is 50lp / mm, and high resolution can be achieved.

[0218] Example 16

[0219] Fig.21 FIG. 1 shows a schematic diagram of the structure of an optical lens according to Example 16 of the present application. Fig.21 As shown, the optical lens includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, and a sixth lens L6 with positive optical power in sequence from the first side to the second side along the optical axis. The surface shape of each lens can be obtained according to the data in Table 31, and no further description is given. Table 31 shows the curvature radius R, thickness / distance, refractive index Nd and Abbe number Vd of each lens of the optical lens of Example 16.

[0220] Table 31

[0221]

[0222] In Example 16, the first side surface S11 and the second side surface S12 of the sixth lens L6 may be aspherical surfaces. Table 32 shows the conic coefficients and high-order coefficients of each aspherical mirror surface that can be used in Example 16, wherein the surface shape of each aspherical surface may be defined by the formula (1) given in the above Example 1.

[0223] Table 32

[0224]

[0225] The optical lens provided in Example 16 has an aperture number FNO of 0.9, which has the characteristic of a large aperture. The MTF peak value of the edge field of view of the optical lens can reach more than 0.72 when the spatial frequency is 50lp / mm, and can achieve high resolution.

[0226] In summary, Examples 1 to 16 respectively satisfy the relationships shown in Table 33 and Table 34. In Table 33 and Table 34, the units of F, ENPD, TTL, H, D, BFL, F1-F6 are millimeters (mm), the unit of FOV is degrees (°), and θ has no unit.

[0227] Table 33

[0228]

[0229] Table 34

[0230]

[0231] The optical lens provided in Examples 1 to 16 of the present application can be used as, for example, a vehicle-mounted lens. In this case, IMA in the structural schematic diagram of the optical lens of Examples 1 to 16 represents an imaging surface, and light from an object passes through each surface S1 to S16 in sequence and is finally imaged on an imaging surface disposed on the second side, wherein an image sensor chip is disposed at the imaging surface. It should be understood that the optical lens provided in Examples 1 to 16 of the present application can also be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, IMA in the structural schematic diagram of Examples 1 to 16 can, for example, represent a light source surface, and light from the light source surface passes through each surface S16 to S1 in sequence and is finally projected to the first side, for example, forming an image or illuminating an area on the first side.

[0232] The present application also provides an electronic device, which may include an optical lens according to the above-mentioned embodiment of the present application, and also includes at least one of an imaging element and a light source, wherein the imaging element is used to convert the optical image formed by the optical lens into an imaging element of an electrical signal, and the light emitted by the light source is projected to the target area after passing through the optical lens to form an image or illuminate the area. When the electronic device includes an optical lens and an imaging element, the electronic device can be an independent electronic device such as a detection distance camera, an imaging module integrated on a device such as a detection distance, an independent imaging device such as a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc., an imaging module integrated on an auxiliary driving system, or a laser radar with at least a receiving end. When the electronic device includes an optical lens and a light source, the electronic device can be a projection module integrated on a mobile electronic device, an independent projection device such as a projector, or a laser radar with at least a transmitting end. When the electronic device includes an optical lens, an imaging element and a light source, the electronic device can be, for example, a laser radar with a transmitting end and a receiving end.

[0233] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. An optical lens, characterized in that: The optical lens includes, in sequence from the first side to the second side along the optical axis: a first lens having negative optical power; a second lens having negative optical power; a third lens having negative optical power; a fourth lens element having positive power, wherein the first side surface of the fourth lens element is convex; a fifth lens having optical power, wherein the first side surface is convex and the second side surface is concave; and a sixth lens having optical power, wherein the first side surface is convex and the second side surface is concave; The number of lenses having optical power in the optical lens is six; The first lens, the second lens and the third lens are all meniscus lenses; The first side is the object side, the second side is the image side, and the light from the object side is imaged on the image side after passing through the optical lens; or the second side is the light source side, and the light from the light source side is projected to the first side after passing through the optical lens to form an image or illuminate an area; The optical lens satisfies: 0.15≤R12 / TTL≤0.3 and -0.6≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.1, wherein R12 is the radius of curvature of the second side surface of the sixth lens, TTL is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis, 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, and F is the effective focal length of the optical lens.

2. The optical lens according to claim 1, characterized in that: The second side surface of the fourth lens is a convex surface or a concave surface; The fifth lens has positive or negative optical power; The sixth lens has positive or negative power.

3. The optical lens according to claim 1, characterized in that: The optical lens meets at least one of the following conditions: 0.2≤TTL / H / FOV×1°≤0.33, 0.05≤D / H / FOV×1°≤0.15, 0.12mm -1 ≤D / H / F≤0.25 mm -1 , 0.01 mm -1 ≤F / ENPD / D≤0.06 mm -1 , Among them, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, D is the maximum light clearance of the first side of the first lens corresponding to the maximum field of view of the optical lens, and ENPD is the entrance pupil diameter of the optical lens.

4. The optical lens according to claim 1, characterized in that: The optical lens satisfies: 3≤TTL / F≤6.

5. The optical lens according to claim 1, characterized in that: The optical lens satisfies: 1.5≤F / H≤2.3, wherein H is the image height corresponding to the maximum field angle of the optical lens.

6. The optical lens according to claim 1, characterized in that: The optical lens satisfies: 0.85≤(H / 2) / (F×tan(θ / 2))≤1.1, wherein H is the image height corresponding to the maximum field angle of the optical lens, and θ is the radian value corresponding to the maximum field angle of the optical lens.

7. The optical lens according to claim 1, characterized in that: The optical lens satisfies: 0.03≤ENPD / H / FOV×1°≤0.11, wherein ENPD is the entrance pupil diameter of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, and FOV is the maximum field of view angle of the optical lens.

8. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens satisfies: F3 / F≤-8.

9. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens satisfies: F2 / F≤-4.

10. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens satisfies: -15≤F1 / F≤-2.

11. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens satisfies: 1≤F4 / F≤4.5, wherein F4 is the effective focal length of the fourth lens.

12. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens satisfies: 0.4≤F3 / F2≤3.

13. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens satisfies: 0.2≤(1 / F5+1 / F6) / (1 / F)≤0.75, wherein F5 is the effective focal length of the fifth lens, and F6 is the effective focal length of the sixth lens.

14. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens satisfies: T45 / TTL≤0.1, wherein T45 is the air interval between the fourth lens and the fifth lens on the optical axis.

15. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens meets the following requirements: |F / F5|≤0.6, wherein F5 is the effective focal length of the fifth lens.

16. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens satisfies: 1≤(R9+R11) / F≤3.2, wherein R9 is the radius of curvature of the first side surface of the fifth lens, and R11 is the radius of curvature of the first side surface of the sixth lens.

17. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens satisfies: 4≤R12 / SAG12≤16, wherein R12 is the radius of curvature of the second side surface of the sixth lens, and SAG12 is the distance from the intersection of the second side surface of the sixth lens and the optical axis to the vertex of the effective radius of the second side surface of the sixth lens on the optical axis.

18. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens meets at least one of the following conditions: 54°≤(FOV×F) / H≤63°, 0.3≤R5 / R6≤2.5, 0.05≤BFL / TTL≤0.18, 0.6≤F / ENPD≤1.5, 0.2≤R3 / R4≤3, 0.2≤R11 / (R12+CT6)≤1, Among them, FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, R5 is the radius of curvature of the first side surface of the third lens, R6 is the radius of curvature of the second side surface of the third lens, BFL is the optical back focus of the optical lens, ENPD is the entrance pupil diameter of the optical lens, R3 is the radius of curvature of the first side surface of the second lens, R4 is the radius of curvature of the second side surface of the second lens, R11 is the radius of curvature of the first side surface of the sixth lens, and CT6 is the center thickness of the sixth lens on the optical axis.

19. The optical lens according to any one of claims 1 to 7, characterized in that: The optical lens meets at least one of the following conditions: 56°≤(FOV×F) / H≤61°, 4≤TTL / F≤5, 0.23≤TTL / H / FOV×1°≤0.3, 0.05≤|F / F5|≤0.44, 0.5≤R5 / R6≤2, 0.07≤D / H / FOV×1°≤0.12, 0.14 mm -1 ≤D / H / F≤0.22 mm -1 , 0.06≤BFL / TTL≤0.15, 1.7≤F / H≤1.9, 0.7≤F / ENPD≤1.2, 0.02 mm -1 ≤F / ENPD / D≤0.05 mm -1 , 0.48≤R3 / R4≤2.43, 0.92≤(H / 2) / (F×tan(θ / 2))≤1, 0.17≤R12 / TTL≤0.22, -23≤F3 / F≤-10, -18≤F2 / F≤-5, 0.05≤ENPD / H / FOV×1°≤0.09, -12≤F1 / F≤-3, 1.2≤F4 / F≤4, 0.6≤F3 / F2≤2.6, 0.3≤(1 / F5+1 / F6) / (1 / F)≤0.65, 0.001≤T45 / TTL≤0.06, 1.4≤(R9+R11) / F≤2.8, 0.3≤R11 / (R12+CT6)≤0.9, 5.4≤R12 / SAG12≤13.5, -0.5≤(1 / F1+1 / F2+1 / F3) / (1 / F)≤-0.2, in, FOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, F5 is the effective focal length of the fifth lens, R5 is the curvature radius of the first side surface of the third lens, R6 is the curvature radius of the second side surface of the third lens, D is the maximum clear aperture of the first side surface of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focus of the optical lens, ENPD is the entrance pupil diameter of the optical lens, R3 is the curvature radius of the first side surface of the second lens, R4 is the curvature radius of the second side surface of the second lens, and θ is the optical The radian value corresponding to the maximum field of view angle of the optical 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, T45 is the air spacing between the fourth lens and the fifth lens on the optical axis, R9 is the curvature radius of the first side surface of the fifth lens, R11 is the curvature radius of the first side surface of the sixth lens, CT6 is the center thickness of the sixth lens on the optical axis, and SAG12 is the distance from the intersection of the second side surface of the sixth lens and the optical axis to the effective radius vertex of the second side surface of the sixth lens on the optical axis.

20. An electronic device, characterized in that: comprising an optical lens according to any one of claims 1 to 19; as well as The electronic device further comprises: at least one of an imaging element and a light source, wherein: The imaging element is used to convert the optical image formed by the optical lens into an electrical signal. The light emitted by the light source is projected onto the target area after passing through the optical lens to form an image or illuminate the area.

Images