Optical lens and electronic equipment

Abstract

The utility model discloses an optical lens and electronic equipment, and the optical lens sequentially comprises a first lens with negative focal power from a first side to a second side along an optical axis, a second lens with negative focal power, a third lens with negative focal power and a fourth lens with negative focal power from the first side to the second side, the second lens has positive focal power; the third lens has positive focal power, and the first side surface of the third lens is a convex surface; the first side surface of the fourth lens is a convex surface, and the second side surface of the fourth lens is a concave surface; the number of the lenses with focal power in the optical lens is four.

Description

TECHNICAL FIELD

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

[0002] In recent years, the automobile auxiliary driving technology has been widely favored by consumers. With the continuous iteration and upgrading of the auxiliary driving technology, as the key component for the vehicle to obtain information, the performance requirements of users and manufacturers for the vehicle-mounted lens (generally, the vehicle-mounted lens refers to all optical lenses installed on the vehicle, and if further subdivided, it can be divided into interior-viewing lenses, rear-viewing lenses, front-viewing lenses, side-viewing lenses, and surround-viewing lenses) are also increasing, and low sensitivity and high resolution are two very important performance requirements. However, in most cases, the reduction of sensitivity is often accompanied by the decrease of resolution, in other words, most of the existing vehicle-mounted lenses cannot achieve the compromise between low sensitivity and high resolution. SUMMARY

[0003] The first aspect of the present application provides such an optical lens, which comprises, in order from a first side to a second side along an optical axis: a first lens having a negative focal power, a second side of the first lens being a concave surface; a second lens having a positive focal power, a second side of the second lens being a convex surface; a third lens having a positive focal power, a first side of the third lens being a convex surface; a fourth lens having a negative focal power, a first side of the fourth lens being a convex surface, and a second side of the fourth lens being a concave surface; the number of lenses having a focal power in the optical lens is four; the optical lens satisfies: 2.323≤F3 / d23≤5.019 and -35.885≤F4 / F≤-12.356; wherein F3 is a focal length of the third lens, d23 is a center distance between the second lens and the third lens, F4 is a focal length of the fourth lens, and F is a total focal length of the optical lens.

[0004] According to an example embodiment of the present application, the first side of the first lens is a convex surface or a concave surface.

[0005] According to an example embodiment of the present application, the first side of the second lens is a concave surface or a convex surface.

[0006] According to an example embodiment of the present application, the second side of the third lens is a convex surface or a concave surface.

[0007] According to an example embodiment of the present application, the curvature radius R31 of the first side of the third lens and the total focal length F of the optical lens satisfy: 1.194≤R31 / F≤3.601.

[0008] According to an example embodiment of the present application, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy: 1.184≤F3 / F≤2.376.

[0009] According to an example embodiment of the present application, the center distance d34 between the third lens and the fourth lens and the total track length TTL of the optical lens satisfy: 0.006≤d34 / TTL≤0.012.

[0010] According to an example embodiment of the present application, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy: -1.896≤F1 / F≤-1.074.

[0011] According to an example embodiment of the present application, the focal length F2 of the second lens and the total focal length F of the optical lens satisfy: 1.644≤F2 / F≤4.248.

[0012] According to an example embodiment of the present application, the curvature radius R12 of the second side surface of the first lens and the total track length TTL of the optical lens satisfy: 0.057≤R12 / TTL≤0.194.

[0013] According to an example embodiment of the present application, the curvature radius R41 of the first side surface of the fourth lens and the total focal length F of the optical lens satisfy: 1.37≤R41 / F≤5.365.

[0014] According to an example embodiment of the present application, the curvature radius R42 of the second side surface of the fourth lens and the total focal length F of the optical lens satisfy: 1.098≤R42 / F≤4.127.

[0015] According to an example embodiment of the present application, the center thickness d6 of the third lens and the focal length F3 of the third lens satisfy: 0.345≤d6 / F3≤1.018.

[0016] According to an example embodiment of the present application, the curvature radius R12 of the second side surface of the first lens and the focal length F1 of the first lens satisfy: -0.644≤R12 / F1≤-0.193.

[0017] According to an example embodiment of the present application, the curvature radius R42 of the second side surface of the fourth lens and the focal length F4 of the fourth lens satisfy: -0.142≤R42 / F4≤-0.039.

[0018] According to an example embodiment of the present application, the focal length F4 of the fourth lens and the center distance d34 between the third lens and the fourth lens satisfy: -1136.394 ≤ F4 / d34 ≤ -313.369.

[0019] According to an example embodiment of the present application, the center distance d23 between the second lens and the third lens and the total track length TTL of the optical lens satisfy: 0.071 ≤ d23 / TTL ≤ 0.158.

[0020] According to an example embodiment of the present application, the center distance d12 between the first lens and the second lens and the focal length F2 of the second lens satisfy: 0.196 ≤ d12 / F2 ≤ 0.458.

[0021] According to an example embodiment of the present application, the focal length F1 of the first lens and the focal length F4 of the fourth lens satisfy: 0.038 ≤ F1 / F4 ≤ 0.106.

[0022] According to an example embodiment of the present application, the optical lens satisfies at least one of the following relationships:

[0023] 0.933 ≤ R41 / R42 ≤ 1.56, 0.181 ≤ BFL / TTL ≤ 0.325, 0.676 ≤ D8 / H ≤ 1.074, 0.011 ≤ SAG8 / F ≤ 0.187, 0.157 ≤ d6 / TTL ≤ 0.285, and -72.596 ≤ R41 / SAG7 ≤ 190.253;

[0024] wherein R41 is the first side curvature radius of the fourth lens, R42 is the second side curvature radius of the fourth lens, BFL is the back focal length of the optical lens, TTL is the total track length of the optical lens, D8 is the second side aperture of the fourth lens, H is the image plane aperture of the optical lens, SAG8 is the second side sag of the fourth lens, F is the total focal length of the optical lens, d6 is the thickness of the third lens, and SAG7 is the first side sag of the fourth lens.

[0025] According to an example embodiment of the present application, the optical lens satisfies at least one of the following relationships:

[0026] - 34.39 < F4 / F < -13.128, 0.992 < R41 / R42 < 1.495, 1.268 < R31 / F < 3.451, 1.258 < F3 / F < 2.277, -1.817 < F1 / F < -1.141, 1.747 < F2 / F < 4.071, 0.061 < R12 / TTL < 0.185, 1.456 < R41 / F < 5.141, 1.167 < R42 / F < 3.955, 0.193 < BFL / TTL < 0.312, 0.719 < D8 / H < 1.029, 0.012 < SAG8 / F < 0.179, 0.166 < d6 / TTL < 0.273, 0.366 < d6 / F3 < 0.976, -0.618 < R12 / F1 < -0.193, -0.12 < R42 / F4 < -0.042, -1089.044 < F4 / d34 < -332.955, -65.000 < R41 / SAG7 < 165, 0.075 < d23 / TTL < 0.151, 2.468 < F3 / d23 < 4.809, 0.208 < d12 / F2 < 0.439, and 0.04 < F1 / F4 < 0.101;

[0027] wherein F1 is a focal length of the first lens, F2 is a focal length of the second lens, F3 is a focal length of the third lens, F4 is a focal length of the fourth lens, F is a total focal length of the optical lens, R12 is a radius of curvature of a second side surface of the first lens, R31 is a radius of curvature of a first side surface of the third lens, R41 is a radius of curvature of a first side surface of the fourth lens, R42 is a radius of curvature of a second side surface of the fourth lens, d12 is a central distance between the first lens and the second lens, d23 is a central distance between the second lens and the third lens, d34 is a central distance between the third lens and the fourth lens, d6 is a thickness of the third lens, BFL is a back focal length of the optical lens, TTL is an optical total track length of the optical lens, D8 is a second side surface aperture of the fourth lens, H is an image surface aperture of the optical lens, SAG7 is a first side surface sag of the fourth lens, and SAG8 is a second side surface sag of the fourth lens.

[0028] A second aspect of the present application provides an electronic device including the optical lens and an imaging element configured to convert an optical image formed by the optical lens into an electrical signal.

[0029] The optical lens according to the embodiment of the present application adopts four lenses with optical power, wherein the first lens has negative optical power, and the second side thereof is concave; the second lens has positive optical power, and the second side thereof is convex; the third lens has positive optical power, and the first side thereof is convex; and the fourth lens has negative optical power, and the first side thereof is convex and the second side thereof is concave. After the light rays are diverged by the first lens, the light rays are emitted to the second lens, wherein the second side of the first lens is set to be concave, which helps the light rays to be properly diverged and then enter the second lens, thereby improving the resolution. The second side of the second lens is set to be convex, which can converge the light rays, reduce the included angle between the light rays and the optical axis, reduce the incident angle of the chief ray, correct the coma, and improve the resolution. Meanwhile, the light rays are converged by the second lens and then emitted to the third lens, which is also conducive to the miniaturization and small aperture of the optical lens. By controlling the ratio of the focal length of the third lens and the distance between the second lens and the third lens to satisfy 2.323≤F3 / d23≤5.019, the third lens can more effectively collect and converge the light rays emitted by the second lens, and then smoothly transition the light rays to the rear system, thereby improving the imaging quality of the optical lens. The light rays are again converged by the third lens and then emitted to the fourth lens, wherein the first side of the third lens is set to be convex, which not only helps the third lens to converge the light rays, but also corrects the spherical aberration, improves the resolution, and is conducive to the miniaturization; and the fourth lens can reasonably diverge the collected light rays, thereby adjusting the optical path difference between different fields of view, converging the light rays to the image plane, setting the first side of the fourth lens to be convex to converge the light rays, and setting the second side of the fourth lens to be concave to reasonably diverge the light rays of each field of view, thereby correcting the field curvature. By controlling the ratio of the focal length of the fourth lens and the total focal length of the optical lens to satisfy -35.885≤F4 / F≤-12.356, it is conducive to reducing the sensitivity while maintaining high resolution. BRIEF DESCRIPTION OF DRAWINGS

[0030] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings. In the drawings:

[0031] Figure 1 A structure diagram of an optical lens according to Embodiment 1 of the present application is shown;

[0032] Figure 2 A modulation transfer function curve (MTF) of the optical lens according to Embodiment 1 of the present application is shown;

[0033] Figure 3 A structure diagram of an optical lens according to Embodiment 2 of the present application is shown;

[0034] Figure 4 A modulation transfer function curve of the optical lens according to Embodiment 2 of the present application is shown;

[0035] Figure 5 A structure schematic diagram of the optical lens according to Embodiment 3 of the present application is shown;

[0036] Figure 6 A modulation transfer function curve of the optical lens according to Embodiment 3 of the present application is shown;

[0037] Figure 7 A structure schematic diagram of the optical lens according to Embodiment 4 of the present application is shown;

[0038] Figure 8 A modulation transfer function curve of the optical lens according to Embodiment 4 of the present application is shown;

[0039] Figure 9 A structure schematic diagram of the optical lens according to Embodiment 5 of the present application is shown;

[0040] Figure 10 A modulation transfer function curve of the optical lens according to Embodiment 5 of the present application is shown;

[0041] Figure 11 A structure schematic diagram of the optical lens according to Embodiment 6 of the present application is shown;

[0042] Figure 12 A modulation transfer function curve of the optical lens according to Embodiment 6 of the present application is shown;

[0043] Figure 13 A structure schematic diagram of the optical lens according to Embodiment 7 of the present application is shown;

[0044] Figure 14 A modulation transfer function curve of the optical lens according to Embodiment 7 of the present application is shown;

[0045] Figure 15 A structure schematic diagram of the optical lens according to Embodiment 8 of the present application is shown;

[0046] Figure 16 A modulation transfer function curve of the optical lens according to Embodiment 8 of the present application is shown;

[0047] Figure 17 A structure schematic diagram of the optical lens according to Embodiment 9 of the present application is shown;

[0048] Figure 18 A modulation transfer function curve of the optical lens according to Embodiment 9 of the present application is shown;

[0049] Figure 19A structural diagram of an optical lens according to Embodiment 10 of the present application is shown.

[0050] Figure 20 A modulation transfer function curve of the optical lens according to Embodiment 10 of the present application is shown. DETAILED DESCRIPTION

[0051] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the drawings. It is to be understood that the detailed description is merely illustrative of the exemplary embodiments of the present application and in no way limits the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements.

[0052] It should be noted that the terms first, second, third, etc. are used herein only to distinguish one feature from another, and do not denote any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0053] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0054] Herein, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is referred to as the first side surface of the lens, and the surface of each lens closest to the second side is referred to as the second side surface of the lens.

[0055] It should also be understood that the terms "comprise", "comprising", and / or "having", when used in this specification, indicate the presence of stated features, elements, and / or components but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "may" indicates that "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0056] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0057] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0058] The features, principles, and other aspects of the present application are described in detail below.

[0059] The optical lens according to the exemplary embodiments of the present application comprises four lenses with refractive powers, i.e., a first lens, a second lens, a third lens, and a fourth lens, which are arranged in order from a first side to a second side along an optical axis.

[0060] In the exemplary embodiments, the optical lens provided by the present application can be used as a light receiving lens or a light emitting lens. The light receiving lens is generally used to collect light from an object side space, and the collected light is used to form detection information, including but not limited to imaging, laser point cloud, etc. The light emitting lens is generally used to transmit light from a light emitting unit to the object side space. According to the role of the light, the light transmitted to the object side space can be divided into projection light used to form a projection image or detection light used to detect target object information, etc.

[0061] It can be understood that when the optical lens provided by the present application is used as a light receiving lens such as a camera lens, a laser radar receiving end lens, a microscope lens, or a telescope lens, the "first side" referred to herein can refer to an object side, and the "second side" can refer to an image side (e.g., a side where a photosensor or a retina is located), i.e., light from the object side can be imaged on the image side. 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 by the present application is used as a light emitting lens such as a projection lens or a laser radar transmitting end lens, the "first side" referred to herein can refer to an object side, and the "second side" can refer to a light source side.

[0062] In some possible embodiments, the optical lens provided in the present application can also simultaneously undertake light receiving and light emitting functions. For example, the optical lens is used in a laser radar system sharing a light receiving path and a light emitting path, and the optical lens simultaneously undertakes the functions of emitting laser and receiving a radar echo light beam. For another example, the optical lens is used in a system integrating optical communication and radar, and the optical lens simultaneously undertakes the functions of emitting a modulated light signal and receiving a radar echo light beam.

[0063] In an exemplary embodiment, the first lens has a negative focal power, and the first side surface thereof can be, for example, a convex surface, and the second side surface thereof is a concave surface. The negative focal power of the first lens can cause the light rays to diverge, so as to adjust the angles of the light rays of a large field of view entering a subsequent optical system. The first side surface is provided as a convex surface, which can reduce the incident angle of the light rays, and is beneficial to collecting more light rays into the optical system to realize large field of view imaging. The second side surface is provided as a concave surface, which can cause the light rays to be properly diverged before entering the rear system to improve resolution.

[0064] In an exemplary embodiment, the first lens has a negative focal power, and the first side surface thereof can be, for example, a concave surface, and the second side surface thereof is a concave surface. The negative focal power of the first lens can cause the light rays to diverge, so as to adjust the angles of the light rays of a large field of view entering a subsequent optical system. The first side surface is provided as a concave surface, which can enhance the deflection of the incident light rays, so that the light rays can enter the subsequent lens at a smaller incident angle, and is beneficial to controlling distortion. The second side surface is provided as a concave surface, which can cause the light rays to be properly diverged before entering the rear system to improve resolution.

[0065] In an exemplary embodiment, the second lens has a positive focal power, and the first side surface thereof can be, for example, a concave surface, and the second side surface thereof can be, for example, a convex surface. The positive focal power of the second lens can further converge the light rays emitted by the first lens, which is beneficial to realizing miniaturization and small aperture of the optical lens. The first side surface is provided as a concave surface, which can smoothly receive the light rays emitted by the first lens, reduces the loss of the light rays, and is beneficial to performance improvement. The second side surface is provided as a convex surface, which can converge the light rays, reduce the included angle between the light rays and the optical axis, reduce the incident angle of the chief ray, correct coma, and improve resolution.

[0066] In an exemplary embodiment, the second lens has a positive focal power, and the first side surface thereof can be, for example, a convex surface, and the second side surface thereof can be, for example, a convex surface. The positive focal power of the second lens can further converge the light rays emitted by the first lens, which is beneficial to realizing miniaturization and small aperture of the optical lens. The first side surface is provided as a convex surface, which can further converge the light rays emitted by the first lens, so as to correct spherical aberration and improve resolution. The second side surface is provided as a convex surface, which can converge the light rays, reduce the included angle between the light rays and the optical axis, reduce the incident angle of the chief ray, correct coma, and improve resolution.

[0067] In an exemplary embodiment, the third lens has positive focal power, the first side surface is convex, and the second side surface can be convex, for example. The positive focal power of the third lens is beneficial for converging light rays. The biconvex design of the first side surface and the second side surface can further improve the converging effect of the third lens on light rays, and then make the light rays enter the rear lens, while being beneficial for smooth transition of the light ray trend.

[0068] In an exemplary embodiment, the third lens has positive focal power, the first side surface is convex, and the second side surface can be concave, for example. The positive focal power of the third lens is beneficial for converging light rays. The first side surface is set to be convex, which is beneficial for converging light rays, correcting spherical aberration, improving resolution, and realizing miniaturization. The second side surface is set to be concave, which can control the light rays to diverge at a certain angle and correct coma, and control the angle of the chief ray entering the fourth lens, which is beneficial for realizing small CRA (Chief Ray Angle).

[0069] In an exemplary embodiment, the fourth lens has negative focal power, the first side surface is convex, and the second side surface is concave. The negative focal power of the fourth lens can reasonably diverge the light rays entering the fourth lens, thereby adjusting the optical path difference between different fields of view and better converging the light rays to the image plane. The first side surface is set to be convex, which can converge the light rays, and because the sag of the first side surface is small, it can avoid excessive deflection of the light rays, thereby reducing sensitivity. The second side surface is set to be concave, which can cooperate with the negative focal power feature of the fourth lens to reasonably diverge the light rays of each field of view, thereby correcting field curvature.

[0070] In an exemplary embodiment, the optical lens can further include a stop, which can be disposed between the second lens and the third lens, for example. By disposing the stop between the second lens and the third lens, it is beneficial for converging the light rays entering the optical system, reducing the lens aperture at the front end of the optical system, and reducing the assembly sensitivity of the system. It should be understood that the stop disposed between the second lens and the third lens is only exemplary, and the present application does not specifically limit it, and the stop can also be disposed at other positions according to actual needs.

[0071] In an exemplary embodiment, at least one of the first side surface of the first lens, the first side surface of the second lens, the second side surface of the second lens, the first side surface of the fourth lens, and the second side surface of the fourth lens has an inflection point. By such a design, the edge light rays can be better converged to the image plane, effectively reducing the generation of aberrations such as coma and field curvature, increasing the included angle of the up and down light rays in the edge field of view, and improving the relative illumination.

[0072] In the example embodiments, the first lens, the second lens and the fourth lens can have one or more aspheric surfaces to reasonably control the deflection of light rays in each field of view, effectively reduce various aberrations such as spherical aberration, coma, distortion and the like, and improve the performance of the optical lens.

[0073] In the example embodiments, the optical lens can further include a filter between the fourth lens and the image plane to filter light rays having different wavelengths. The optical lens can further include a protective glass between the filter and the image plane according to actual needs to prevent internal components (e.g., a chip) of the optical lens from being damaged.

[0074] In the example embodiments, the optical lens can further include a photosensitive element disposed on the second side. Optionally, the photosensitive element disposed on the second side can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS).

[0075] In the example embodiments, the focal length F4 of the fourth lens and the total focal length F of the optical lens satisfy: -35.885≤F4 / F≤-12.356. Preferably, -34.39≤F4 / F≤-13.128. Further, -29.908≤F4 / F≤-15.447. By controlling the relationship, the ratio of the focal length of the fourth lens to the total focal length of the optical lens can be controlled, which is conducive to reducing the sensitivity. If the focal length of the fourth lens is too small, the deflection of light rays will be too strong, and under the influence of large tolerance, the performance will be reduced. If the focal length of the fourth lens is too large, although the sensitivity can be reduced, the light rays cannot be well converged, which makes the aberration cannot be well corrected, resulting in insufficient resolving power.

[0076] In the example embodiments, the first side curvature radius R41 of the fourth lens and the second side curvature radius R42 of the fourth lens satisfy: 0.933≤R41 / R42≤1.56. Preferably, 0.992≤R41 / R42≤1.495. Further, 1.167≤R41 / R42≤1.3. By controlling the relationship, the two side surfaces of the fourth lens can have similar curvature radii, which makes the light rays incident on the fourth lens and the light rays emitted from the fourth lens have smaller deflection power, which is conducive to reducing the sensitivity of the fourth lens. Further, by controlling the value of F4 / F, the sensitivity of the fourth lens can be effectively reduced.

[0077] In exemplary embodiments, the radius of curvature R31 of the first side surface of the third lens and the total focal length F of the optical lens satisfy: 1.194≤R31 / F≤3.601. Preferably, 1.268≤R31 / F≤3.451. Further, 1.492≤R31 / F≤3.001. By controlling the ratio of the radius of curvature of the first side surface of the third lens and the total focal length of the optical lens, the ghost focus of the secondary reflection of the third lens and other lenses can be far away from the image plane, and the ghost image energy can be reduced. Otherwise, no matter whether the radius of curvature of the first side surface of the third lens is too large or too small, the ghost focus will be close to the image plane, resulting in a strong ghost image.

[0078] In exemplary embodiments, the focal length F3 of the third lens and the total focal length F of the optical lens satisfy: 1.184≤F3 / F≤2.376. Preferably, 1.258≤F3 / F≤2.277. Further, 1.481≤F3 / F≤1.98. By controlling the ratio of the focal length of the third lens and the total focal length of the optical lens, high resolution can be achieved. The positive refractive power design of the third lens is beneficial to light convergence. On the other hand, if the focal length of the third lens is too large, the light cannot be well converged on the image plane, resulting in low resolution; if the focal length of the third lens is too small, the light deflection will be too large, and the system sensitivity will be high. Further numerical control of R31 / F can ensure low sensitivity and weak ghost image of the system.

[0079] In exemplary embodiments, the center distance d34 between the third lens and the fourth lens and the total optical length TTL of the optical lens satisfy: 0.006≤d34 / TTL≤0.012. Further, 0.007≤d34 / TTL≤0.01. By controlling the relationship, while reducing the center distance between the third lens and the fourth lens, it is also beneficial to reduce the total optical length of the optical lens, which is beneficial to the miniaturization of the optical lens. The above relationship also avoids the center distance between the third lens and the fourth lens being too small, thereby reducing the shape limitation of the second side surface of the third lens and the first side surface of the fourth lens, and also reducing the risk of collision between the third lens and the fourth lens during assembly.

[0080] In exemplary embodiments, the focal length F1 of the first lens and the total focal length F of the optical lens satisfy: -1.896≤F1 / F≤-1.074. Preferably, -1.817≤F1 / F≤-1.141. Further, -1.58≤F1 / F≤-1.342. By controlling the relationship, the focal length of the first lens can be small, which is conducive to the collection of large-angle light rays in the outer field of view and the miniaturization of the lens. If the focal length of the first lens is too large, the deflection ability of the light rays will be insufficient, and other lenses or an increased TTL will be needed to compensate. If the focal length is too small, the deflection ability of the light rays will be too strong, which will not only increase the sensitivity but also be detrimental to the correction of spherical aberration and affect the resolution.

[0081] In exemplary embodiments, the focal length F2 of the second lens and the total focal length F of the optical lens satisfy: 1.644≤F2 / F≤4.248. Preferably, 1.747≤F2 / F≤4.071. Further, 2.055≤F2 / F≤3.541. By controlling the relationship, the positive focal length of the second lens can be controlled to adjust the exiting light rays of the first lens, reduce the angle between the light rays and the optical axis, and enable the light rays to enter the subsequent lenses smoothly, which is conducive to the correction of spherical aberration and the improvement of resolution.

[0082] In exemplary embodiments, the curvature radius R12 of the second side surface of the first lens and the total optical length TTL of the optical lens satisfy: 0.057≤R12 / TTL≤0.194. Preferably, 0.061≤R12 / TTL≤0.185. Further, 0.071≤R12 / TTL≤0.161. By controlling the relationship, the second side surface of the first lens can be concave and have a small curvature radius, which is conducive to reducing the TTL and achieving a small aperture.

[0083] In exemplary embodiments, the curvature radius R41 of the first side surface of the fourth lens and the total focal length F of the optical lens satisfy: 1.37≤R41 / F≤5.365. Preferably, 1.456≤R41 / F≤5.141. Further, 1.713≤R41 / F≤4.471. By controlling the relationship, the first side surface of the fourth lens can be convex and its curvature radius can be reasonably controlled, which is not only conducive to optical convergence, the correction of spherical aberration, and the improvement of resolution, but also adjusts the deflection angle of the chief rays in each field of view, which is conducive to achieving a small CRA.

[0084] In exemplary embodiments, the second side surface radius of curvature R42 of the fourth lens and the total focal length F of the optical lens satisfy: 1.098≤R42 / F≤4.127. Preferably, 1.167≤R42 / F≤3.955. Further, 1.373≤R42 / F≤3.439. By controlling the relationship, the second side surface radius of curvature of the fourth lens can be controlled to adjust the angle of the field rays to the image plane, which is conducive to achieving small CRA. If R42 is too small, the edge field rays are deflected too much, resulting in a large CRA; if R42 is too large, the light rays are not deflected enough, and the convergence effect at the image plane is poor, making it difficult to correct the spherical aberration and field curvature, thereby affecting the resolution.

[0085] In exemplary embodiments, the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.181≤BFL / TTL≤0.325. Preferably, 0.193≤BFL / TTL≤0.312. Further, 0.227≤BFL / TTL≤0.271. By controlling the relationship, the ratio of the back focal length of the optical lens to the total optical length of the optical lens can be controlled to achieve the target of the back focal length, which is conducive to the module architecture design. In addition, a longer back focal length is also conducive to the ghost image weakening effect of the color filter.

[0086] In exemplary embodiments, the second side surface aperture D8 of the fourth lens and the image plane aperture H of the optical lens satisfy: 0.676≤D8 / H≤1.074. Preferably, 0.719≤D8 / H≤1.029. Further, 0.846≤D8 / H≤0.895. By controlling the relationship, the second side surface aperture of the fourth lens can be made close to the image plane aperture of the optical lens to reduce the angle between the light rays and the image plane, thereby achieving small CRA.

[0087] In exemplary embodiments, the second side surface sagitta SAG8 of the fourth lens and the total focal length F of the optical lens satisfy: 0.011≤SAG8 / F≤0.187. Preferably, 0.012≤SAG8 / F≤0.179. Further, 0.014≤SAG8 / F≤0.155. By controlling the relationship, the second side surface sagitta of the fourth lens can be reduced, which is conducive to reducing the deflection of the edge field rays, correcting the coma, and improving the resolution. If the second side surface sagitta of the fourth lens is too large, it will cause the edge field rays to be deflected too much, which in turn will cause the angle of the light rays incident on the image plane to be too large, making it difficult to achieve small CRA.

[0088] In exemplary embodiments, the thickness d6 of the third lens and the total track length TTL of the optical lens satisfy: 0.157≤d6 / TTL≤0.285. Preferably, 0.166≤d6 / TTL≤0.273. Further, 0.196≤d6 / TTL≤0.238. By controlling the ratio of the thickness of the third lens and the total track length of the optical lens, the convergence of the marginal field rays and the smooth transition can be controlled, and the resolution can be improved.

[0089] In exemplary embodiments, the thickness d6 of the third lens and the focal length F3 of the third lens satisfy: 0.345≤d6 / F3≤1.018. Preferably, 0.366≤d6 / F3≤0.976. Further, 0.431≤d6 / F3≤0.848. By controlling the ratio of the thickness of the third lens and the focal length of the third lens, the thickness of the third lens can be larger and the focal length can be smaller, which is beneficial to the smooth transition of the marginal rays to the rear, and the resolution can be improved.

[0090] In exemplary embodiments, the curvature radius R12 of the second side of the first lens and the focal length F1 of the first lens satisfy: -0.644≤R12 / F1≤-0.193. Preferably, -0.618≤R12 / F1≤-0.193. Further, -0.537≤R12 / F1≤-0.241. By controlling the ratio of the curvature radius of the second side of the first lens and the focal length of the first lens, the second side of the first lens can be concave, and the curvature radius of the second side of the first lens and the focal length of the first lens are both smaller, which is beneficial to the collection of large-angle rays into the rear system, and the resolution can be improved while reducing the aperture of the first lens.

[0091] In exemplary embodiments, the curvature radius R42 of the second side of the fourth lens and the focal length F4 of the fourth lens satisfy: -0.142≤R42 / F4≤-0.039. Preferably, -0.12≤R42 / F4≤-0.042. Further, -0.118≤R42 / F4≤-0.049. By controlling the ratio of the curvature radius of the second side of the fourth lens and the focal length of the fourth lens, the second side of the fourth lens can be concave and the focal length of the fourth lens can be increased, which is beneficial to the smooth transition of the marginal rays to the rear, and the small CRA can be realized while reducing the sensitivity.

[0092] In exemplary embodiments, the focal length F4 of the fourth lens and the center distance d34 between the third lens and the fourth lens satisfy: -1136.394≤F4 / d34≤-313.369. Preferably, -1089.044≤F4 / d34≤-332.955. Further, -947≤F4 / d34≤-390.991. By controlling the relationship, the center distance between the third lens and the fourth lens can be small, and the convex design of the first side surface of the fourth lens can quickly receive the light emitted by the third lens, thereby shortening the optical path. The above relationship can also make the focal length of the fourth lens larger, so as to gently flatten the light and reduce the sensitivity.

[0093] In exemplary embodiments, the first side surface curvature radius R41 of the fourth lens and the first side surface sag SAG7 of the fourth lens satisfy: -72.596≤R41 / SAG7≤190.253. Preferably, -65.000≤R41 / SAG7≤165. Further, -60.409≤R41 / SAG7≤160.25. By controlling the relationship, the first side surface of the fourth lens can be convex and the sag can be small, so as to facilitate light convergence, while also avoiding excessive deflection of the light and reducing the sensitivity.

[0094] In exemplary embodiments, the center distance d23 between the second lens and the third lens and the total optical length TTL of the optical lens satisfy: 0.071≤d23 / TTL≤0.158. Preferably, 0.075≤d23 / TTL≤0.151. Further, 0.088≤d23 / TTL≤0.131. By controlling the relationship between the center distance between the second lens and the third lens and the total optical length of the optical lens, the light emitted by the second lens can be smoothly transitioned to the rear, thereby reducing the sensitivity.

[0095] In exemplary embodiments, the focal length F3 of the third lens and the center distance d23 between the second lens and the third lens satisfy: 2.323≤F3 / d23≤5.019. Preferably, 2.468≤F3 / d23≤4.809. Further, 2.902≤F3 / d23≤4.184. By controlling the relationship between the focal length of the third lens and the center distance between the second lens and the third lens, the third lens can effectively collect and converge the light emitted by the second lens and smoothly transition it to the rear, thereby improving the imaging quality.

[0096] In an exemplary embodiment, the center distance d12 between the first lens and the second lens and the focal length F2 of the second lens satisfy: 0.196≤d12 / F2≤0.458. Preferably, 0.208≤d12 / F2≤0.439. Further, 0.245≤d12 / F2≤0.382. By controlling the relationship, the ratio of the center distance between the first lens and the second lens and the focal length of the second lens can be controlled, and the light emitted by the first lens can be gently converged to the second lens, which is beneficial to high resolution while achieving miniaturization.

[0097] In an exemplary embodiment, the focal length F1 of the first lens and the focal length F4 of the fourth lens satisfy: 0.038≤F1 / F4≤0.106. Preferably, 0.04≤F1 / F4≤0.101. Further, 0.048≤F1 / F4≤0.088. By controlling the relationship, the focal length distribution of the first lens and the fourth lens can be controlled, which is beneficial to collecting large-angle light and smoothly transferring to the rear image plane, improving the imaging quality.

[0098] The optical lens according to the above embodiments of the present application can adopt multiple lenses, for example, the four lenses described above. By reasonably distributing the optical parameters of each lens, the optical lens is achieved small aperture, miniaturization, high resolution, low sensitivity, large angular resolution, large field of view, long back focal length, small distortion, small chief ray angle, high illumination, and processability, and can be well matched with, for example, a vehicle-mounted chip, without generating a dark corner phenomenon. Therefore, the optical lens according to the above embodiments of the present application can better meet the requirements of, for example, vehicle-mounted applications.

[0099] Those skilled in the art should understand that the total optical length TTL of the optical lens used in the above is the axial distance from the first side of the first lens to the imaging plane or image source plane; the back focal length BFL of the optical lens is the axial distance from the second side of the fourth lens to the imaging plane or image source plane.

[0100] However, those skilled in the art should understand that the number of lenses constituting the optical lens can be changed without departing from the technical solutions claimed by the present application to obtain the various results and advantages described in the specification. For example, although the four lenses are described as an example in the embodiments, the optical lens is not limited to including four lenses. If necessary, the optical lens can also include other numbers of lenses.

[0101] The specific embodiments of the optical lens applicable to the above embodiments will be further described below with reference to the accompanying drawings.

[0102] Embodiment 1

[0103] The following refers to Figure 1 An optical lens according to Embodiment 1 of the present application is described.

[0104] like Figure 1 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. A stop STO may be disposed between the second lens L2 and the third lens L3. A first side surface S8 of the fourth lens L4 has at least one inflection point.

[0105] The first lens L1 has negative refractive power, a first side surface S1 of the first lens L1 is convex, and a second side surface S2 of the first lens L1 is concave.

[0106] The second lens L2 has positive refractive power, a first side surface S3 thereof is concave, and a second side surface S4 thereof is convex.

[0107] The third lens L3 has positive refractive power, and its first side surface S6 and second side surface S7 are convex.

[0108] The fourth lens L4 has negative refractive power, and its first side surface S8 is convex, and its second side surface S9 is concave.

[0109] The second side of the optical lens is provided with an image plane IMA. A filter IR and a protective glass CG are disposed between the fourth lens element L4 and the image plane IMA. The filter IR has a first side surface S10 and a second side surface S11, and the protective glass CG has a first side surface S12 and a second side surface S13. When the IMA serves as the imaging plane, light from an object sequentially passes through each surface and ultimately forms an image on the IMA. When the IMA serves as the image source plane, light from the IMA sequentially passes through each surface and ultimately forms an image on the object.

[0110] Table 1 shows the basic parameters of the optical lens of Example 1.

[0111] Table 1

[0112]

[0113] In Example 1, the first side surface S1 of the first lens L1, the second side surface S2 of the first lens L1, the first side surface S3 of the second lens L2, the second side surface S4 of the second lens L2, the first side surface S8 of the fourth lens L4, and the second side surface S9 of the fourth lens L4 are all aspherical surfaces. The surface shape of each aspherical surface can be defined by, but is not limited to, the following aspherical surface formula:

[0114] (1)

[0115] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient for the i-th order of the aspheric surface. Table 2 shows the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the aspheric surfaces S1, S2, S3, S4, S8, and S9 in Example 1.

[0116] Table 2

[0117]

[0118] from Figure 2 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 1 exceeds 0.8 at a spatial frequency of 60 lp / mm (60 line pairs / mm). Therefore, the optical lens of Example 1 has good imaging quality.

[0119] Example 2

[0120] See below Figure 3 , shown is a schematic diagram of the optical lens structure provided in Example 2 of the present utility model. Compared with Example 1, the main difference between this embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0121] Table 3 shows the basic parameters of the optical lens of Example 2.

[0122] Table 3

[0123]

[0124] Table 4 gives the cone coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspheric surfaces S1, S2, S3, S4, S8 and S9 that can be used in Example 2.

[0125] Table 4

[0126]

[0127] from Figure 4 From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 2 exceeds 0.8 at a spatial frequency of 60 lp / mm (60 line pairs / mm). Therefore, the optical lens of Example 2 has good imaging quality.

[0128] Example 3

[0129] See below Figure 5As shown in the optical lens structure schematic diagram provided in the embodiment 3 of the utility model, compared with the embodiment 1, the main difference lies in that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different, and the first side S1 of the first lens L1 is a concave surface.

[0130] Table 5 shows the basic parameter table of the optical lens of embodiment 3.

[0131] Table 5

[0132]

[0133] Table 6 gives the conic coefficient k and high order coefficient A4, A6, A8, A10, A12, A14 and A16 of each aspheric surface S1, S2, S3, S4, S8 and S9 that can be used in embodiment 3.

[0134] Table 6

[0135]

[0136] From the perspective of Figure 6 , the MTF peak value of the central field of view of the optical lens of embodiment 3 at the spatial frequency 60 lp / mm (60 line pairs per millimeter) exceeds 0.8. Therefore, the optical lens given in embodiment 3 has good imaging quality.

[0137] Embodiment 4

[0138] The following refers to Figure 7 , as shown in the optical lens structure schematic diagram provided in the embodiment 4 of the utility model, compared with the embodiment 1, the main difference lies in that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different, and the first side S1 of the first lens L1 is a concave surface; and the first side S1 of the first lens L1 has at least one inflection point, and the first side S8 of the fourth lens L4 has at least one inflection point.

[0139] Table 7 shows the basic parameter table of the optical lens of embodiment 4.

[0140] Table 7

[0141]

[0142] Table 8 gives the conic coefficient k and high order coefficient A4, A6, A8, A10, A12, A14 and A16 of each aspheric surface S1, S2, S3, S4, S8 and S9 that can be used in embodiment 4.

[0143] Table 8

[0144]

[0145] From Figure 8 view, the MTF peak value of the central field of view of the optical lens of embodiment 4 at a spatial frequency of 60 lp / mm (60 line pairs per millimeter) exceeds 0.8. Therefore, the optical lens given in embodiment 4 has better imaging quality.

[0146] Embodiment 5

[0147] Referring to Figure 9 , the optical lens structure schematic diagram provided in the embodiment 5 of the utility model is shown, and compared with the embodiment 1, the main difference lies in that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different;And the first side S3 of the second lens L2 is a convex surface;And the first side S3 of the second lens L2 has at least one inflection point, the first side S8 of the fourth lens L4 has at least one inflection point, and the second side S9 of the fourth lens L4 has at least one inflection point.

[0148] Table 9 shows the basic parameter table of the optical lens of embodiment 5.

[0149] Table 9

[0150]

[0151] Table 10 gives the conic coefficient k and high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspheric surface S1, S2, S3, S4, S8 and S9 that can be used in embodiment 5.

[0152] Table 10

[0153]

[0154] From Figure 10 view, the MTF peak value of the central field of view of the optical lens of embodiment 5 at a spatial frequency of 60 lp / mm (60 line pairs per millimeter) exceeds 0.8. Therefore, the optical lens given in embodiment 5 has better imaging quality.

[0155] Embodiment 6

[0156] Referring to Figure 11 , the optical lens structure schematic diagram provided in the embodiment 6 of the utility model is shown, and compared with the embodiment 1, the main difference lies in that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different;And the first side S3 of the second lens L2 is a convex surface;And the first side S3 of the second lens L2 has at least one inflection point, the first side S8 of the fourth lens L4 has at least one inflection point, and the second side S9 of the fourth lens L4 has at least one inflection point.

[0157] Table 11 shows the basic parameter table of the optical lens of Example 6.

[0158] Table 11

[0159]

[0160] Table 12 gives the conic coefficients k and high order coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical surface S1, S2, S3, S4, S8 and S9 that can be used in Example 6.

[0161] Table 12

[0162]

[0163] From Figure 12 the center field of view of the optical lens of Example 6 has an MTF peak value exceeding 0.8 at a spatial frequency of 60 lp / mm (60 line pairs per millimeter). Therefore, the optical lens given in Example 6 has good imaging quality.

[0164] Example 7

[0165] Referring to Figure 13 , the optical lens structure schematic diagram provided in Example 7 of the utility model is shown, and compared with Example 1, the main difference is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the first side S3 of the second lens L2 is a convex surface; and the second side S4 of the second lens L2 has at least one inflection point, the first side S8 of the fourth lens L4 has at least one inflection point, and the second side S9 of the fourth lens L4 has at least one inflection point.

[0166] Table 13 shows the basic parameter table of the optical lens of Example 7.

[0167] Table 13

[0168]

[0169] Table 14 gives the conic coefficients k and high order coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical surface S1, S2, S3, S4, S8 and S9 that can be used in Example 7.

[0170] Table 14

[0171]

[0172] From Figure 14From the above, we can see that the MTF peak value of the central field of view of the optical lens of Example 7 exceeds 0.8 at a spatial frequency of 60 lp / mm (60 line pairs / mm). Therefore, the optical lens of Example 7 has good imaging quality.

[0173] Example 8

[0174] See below Figure 15 , shown is a schematic diagram of the optical lens structure provided in Example 8 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; the first side surface S3 of the second lens L2 is a convex surface; the second side surface S4 of the second lens L2 has at least one inflection point, the first side surface S8 of the fourth lens L4 has at least one inflection point, and the second side surface S9 of the fourth lens L4 has at least one inflection point.

[0175] Table 15 shows the basic parameters of the optical lens of Example 8.

[0176] Table 15

[0177]

[0178] Table 16 gives the cone coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspheric surfaces S1, S2, S3, S4, S8 and S9 that can be used in Example 8.

[0179] Table 16

[0180]

[0181] from Figure 16 From the above, we can see that the MTF peak of the central field of view of the optical lens of Example 8 exceeds 0.8 at a spatial frequency of 60 lp / mm (60 line pairs / mm). Therefore, the optical lens of Example 8 has good imaging quality.

[0182] Example 9

[0183] See below Figure 17 , shown is a schematic diagram of the optical lens structure provided in Example 9 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the second side surface S7 of the third lens L3 is concave.

[0184] Table 17 shows the basic parameters of the optical lens of Example 9.

[0185] Table 17

[0186]

[0187] Table 18 gives the conic coefficients k and the higher order coefficients A4, A6, A8, A10, A12, A14 and A16 for each aspherical surface S1, S2, S3, S4, S8 and S9 used in the optical lens of Example 9.

[0188] Table 18

[0189]

[0190] From the point of view of the MTF peak value of the central field of view of the optical lens of Example 9 at a spatial frequency of 60 lp / mm (60 line pairs per millimeter), it is more than 0.8. Therefore, the optical lens given in Example 9 has better imaging quality. Figure 18 Example 10

[0191] Referring to FIG. 10, an optical lens structure schematic diagram provided in the embodiment 10 of the utility model is shown, compared with the embodiment 1, the main difference lies in: the radius of curvature of each lens surface, lens thickness and other optical parameters are different, and the second side S7 of the third lens L3 is a concave surface.

[0192] Figure 19 Table 19 shows the basic parameter table of the optical lens of Example 10.

[0193] Table 19

[0194] Table 19

[0195]

[0196] Table 20 gives the conic coefficients k and the higher order coefficients A4, A6, A8, A10, A12, A14 and A16 for each aspherical surface S1, S2, S3, S4, S8 and S9 used in the optical lens of Example 10.

[0197] Table 20

[0198]

[0199] From the point of view of the MTF peak value of the central field of view of the optical lens of Example 10 at a spatial frequency of 60 lp / mm (60 line pairs per millimeter), it is more than 0.8. Therefore, the optical lens given in Example 10 has better imaging quality. Figure 20

[0200] ​​Table 21-1 and Table 22-2 give the basic parameters of the optical lens in Example 1-Example 10, such as F, F1, F2, F3, F4, D8, SAG7, SAG8, etc., the unit of the parameters is mm. Unless otherwise specified, R11, R12, R21, R22, R41, R42 in Example 1-Example 10 are the radius of curvature at the center of the corresponding side surface. E1-E10 respectively represent Example 1-Example 10.

[0201] Table 21-1

[0202]

[0203] Table 21-2

[0204]

[0205] In summary, the relationship of each of Example 1-10 satisfies the relationship shown in Table 22-1 and Table 22-2.

[0206] Table 22-1

[0207]

[0208] Table 22-2

[0209]

[0210] The present application also provides an electronic device comprising the optical lens in the above exemplary embodiments and an imaging element for converting the optical image formed by the optical lens into an electrical signal, the imaging element is disposed on the second side of the optical lens, for example, on the imaging surface, which can be, for example, a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The light from the first side is imaged on the second side after passing through the optical lens.

[0211] The present application also provides an electronic device comprising the optical lens in the above exemplary embodiments and a light source, the light source is located on the second side of the optical lens. The light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side.

[0212] The application also provides an electronic device, which comprises a first device and a second device. The first device can be, for example, a laser radar emitting device, and the second device can be, for example, a laser radar receiving device. The first device can comprise the optical lens and the light source in the above-described exemplary embodiments, and the light source is located at the second side of the optical lens. The light emitted by the light source is projected to the first side of the optical lens after passing through the optical lens, and forms an image or illuminates an area on the first side. The second device can comprise the optical lens and the imaging element for converting the optical image formed by the optical lens into an electrical signal in the above-described exemplary embodiments. The imaging element is arranged at the second side of the optical lens (for example, on the imaging surface). The imaging element can be, for example, a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS). The light from the first side is imaged on the second side after passing through the optical lens.

[0213] The above description is merely preferred embodiments of the application and a description of the principles of the technology used. Those skilled in the art should understand that the scope of the utility model disclosed in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the concept of the utility model. For example, the technical solutions formed by replacing the above-described features with the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical lens, characterized in that: The device comprises, in order from the first side to the second side along the optical axis: a first lens having negative optical power, wherein the second side surface of the first lens is concave; a second lens having positive optical power, wherein the second side surface of the second lens is a convex surface; a third lens having positive optical power, wherein the first side surface of the third lens is a convex surface; a fourth lens having negative optical power, wherein a first side surface of the fourth lens is convex and a second side surface of the fourth lens is concave; The number of lenses having optical power in the optical lens is four; The optical lens satisfies the following requirements: 2.323≤F3 / d23≤5.019 and -35.885≤F4 / F≤-12.356; Among them, F3 is the focal length of the third lens, d23 is the center distance between the second lens and the third lens, F4 is the focal length of the fourth lens, and F is the total focal length of the optical lens.

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

3. The optical lens according to claim 1, wherein: The first side surface of the second lens is a concave surface or a convex surface.

4. The optical lens according to claim 1, wherein: The second side surface of the third lens is a convex surface or a concave surface.

5. The optical lens according to any one of claims 1 to 4, characterized in that: The curvature radius R31 of the first side surface of the third lens and the total focal length F of the optical lens satisfy the following conditions: 1.194≤R31 / F≤3.

601.

6. The optical lens according to any one of claims 1 to 4, characterized in that: The focal length F3 of the third lens and the total focal length F of the optical lens satisfy the following: 1.184≤F3 / F≤2.

376.

7. The optical lens according to any one of claims 1 to 4, characterized in that: The center distance d34 between the third lens and the fourth lens and the total optical length TTL of the optical lens satisfy the following conditions: 0.006≤d34 / TTL≤0.

012.

8. The optical lens according to any one of claims 1 to 4, characterized in that: The focal length F1 of the first lens and the total focal length F of the optical lens satisfy the following: -1.896≤F1 / F≤-1.

074.

9. The optical lens according to any one of claims 1 to 4, characterized in that: The focal length F2 of the second lens and the total focal length F of the optical lens satisfy the following: 1.644≤F2 / F≤4.

248.

10. The optical lens according to any one of claims 1 to 4, characterized in that: The curvature radius R12 of the second side surface of the first lens and the total optical length TTL of the optical lens satisfy the following conditions: 0.057≤R12 / TTL≤0.

194.

11. The optical lens according to any one of claims 1 to 4, characterized in that: The curvature radius R41 of the first side surface of the fourth lens and the total focal length F of the optical lens satisfy the following: 1.37≤R41 / F≤5.

365.

12. The optical lens according to any one of claims 1 to 4, characterized in that: The curvature radius R42 of the second side surface of the fourth lens and the total focal length F of the optical lens satisfy the following: 1.098≤R42 / F≤4.

127.

13. The optical lens according to any one of claims 1 to 4, characterized in that: A center thickness d6 of the third lens and a focal length F3 of the third lens satisfy the following: 0.345≤d6 / F3≤1.

018.

14. The optical lens according to any one of claims 1 to 4, characterized in that: A curvature radius R12 of the second side surface of the first lens and a focal length F1 of the first lens satisfy the following: -0.644≤R12 / F1≤-0.

193.

15. The optical lens according to any one of claims 1 to 4, characterized in that: A curvature radius R42 of the second side surface of the fourth lens and a focal length F4 of the fourth lens satisfy the following: -0.142≤R42 / F4≤-0.

039.

16. The optical lens according to any one of claims 1 to 4, characterized in that: A focal length F4 of the fourth lens and a center distance d34 between the third lens and the fourth lens satisfy the following conditions: -1136.394≤F4 / d34≤-313.

369.

17. The optical lens according to any one of claims 1 to 4, characterized in that: The center distance d23 between the second lens and the third lens and the total optical length TTL of the optical lens satisfy the following: 0.071≤d23 / TTL≤0.

158.

18. The optical lens according to any one of claims 1 to 4, characterized in that: A center distance d12 between the first lens and the second lens and a focal length F2 of the second lens satisfy the following: 0.196≤d12 / F2≤0.

458.

19. The optical lens according to any one of claims 1 to 4, characterized in that: The focal length F1 of the first lens and the focal length F4 of the fourth lens satisfy: 0.038≤F1 / F4≤0.

106.

20. The optical lens according to any one of claims 1 to 4, characterized in that: The optical lens satisfies at least one of the following relationships: 0.933≤R41 / R42≤1.56, 0.181≤BFL / TTL≤0.325, 0.676≤D8 / H≤1.074, 0.011≤SAG8 / F≤0.187, 0.157≤d6 / TTL≤0.285 and -72.596≤R41 / SAG7≤190.253; Among them, R41 is the first side curvature radius of the fourth lens, R42 is the second side curvature radius of the fourth lens, BFL is the back focal length of the optical lens, TTL is the total optical length of the optical lens, D8 is the second side aperture of the fourth lens, H is the image plane aperture of the optical lens, SAG8 is the second side sag of the fourth lens, F is the total focal length of the optical lens, d6 is the thickness of the third lens, and SAG7 is the first side sag of the fourth lens.

21. The optical lens according to any one of claims 1 to 4, characterized in that: The optical lens satisfies at least one of the following relationships: -34.39≤F4 / F≤-13.128、0.992≤R41 / R42≤1.495、1.268≤R31 / F≤3.451、1.258≤F3 / F≤2.277、-1.817≤F1 / F≤-1.141、1.747≤F2 / F≤4.071、0.061≤R12 / TTL≤0.185、1.456≤R41 / F≤5.141、1.167≤R42 / F≤3.955、0.193≤BFL / TTL≤0.312、0.719≤D8 / H≤1.029、0.012≤S AG8 / F≤0.179, 0.166≤d6 / TTL≤0.273, 0.366≤d6 / F3≤0.976, -0.618≤R12 / F1≤-0.193, -0.12≤R42 / F4≤-0.042, -1089.044≤F4 / d34≤-332.955, -65.000≤R41 / SAG7≤165, 0.075≤d23 / TTL≤0.151, 2.468≤F3 / d23≤4.809, 0.208≤d12 / F2≤0.439, and 0.04≤F1 / F4≤0.101; Wherein, F1 is the focal length of the first lens, F2 is the focal length of the second lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, and F is the total focal length of the optical lens; R12 is the curvature radius of the second side surface of the first lens, R31 is the curvature radius of the first side surface of the third lens, R41 is the curvature radius of the first side surface of the fourth lens, and R42 is the curvature radius of the second side surface of the fourth lens; d12 is the center distance between the first lens and the second lens, d23 is the center distance between the second lens and the third lens, d34 is the center distance between the third lens and the fourth lens, and d6 is the thickness of the third lens; BFL is the back focal length of the optical lens, TTL is the total optical length of the optical lens, H is the image plane aperture of the optical lens, D8 is the second side aperture of the fourth lens, SAG7 is the first side sag of the fourth lens, and SAG8 is the second side sag of the fourth lens.

22. An electronic device, characterized in that: The optical lens comprises the optical lens according to any one of claims 1 to claim 21 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

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