Optical lens and electronic device

Abstract

The application discloses an optical lens and an electronic device, which sequentially comprises a first lens with optical power, a second lens with optical power, a third lens with positive optical power and a fourth lens with positive optical power from a first side to a second side along an optical axis; the first side of the first lens is a convex surface, the second side of the first lens is a concave surface, the first side of the second lens is a concave surface, the second side of the second lens is a convex surface, the first side of the fourth lens is a convex surface, and the second side of the fourth lens is a concave surface. The number of lenses with optical power in the optical lens is four, and the optical lens satisfies: -0.0152 mm-1≤R2 / R3 / F1≤0.0452 mm-1 and 0.5642≤(1 / F3+1 / F4)xF≤0.9315.

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] The conventional vehicle-mounted laser radar lens has a relatively large installation space on the vehicle, and is not an appearance-protruding component, so the requirement for volume is relatively loose. With the development of the Moore's law of laser radar, the laser radar lens originally used as a vehicle-mounted radar gradually expands its application object to slow-speed robots. On slow-speed robots, the installation space available for the laser radar lens is relatively small, thereby further miniaturization of the laser radar lens is required. However, on the other hand, the miniaturization of the laser radar lens is often realized at the expense of the imaging quality. Therefore, it is urgent to propose a lens that can balance the imaging quality and miniaturization to meet the use requirements on slow-speed robots. 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 optical power, a second lens having optical power, a third lens having positive optical power, and a fourth lens having positive optical power; the first side of the first lens is a convex surface, the second side of the first lens is a concave surface, the first side of the second lens is a concave surface, the second side of the second lens is a convex surface, the first side of the fourth lens is a convex surface, and the second side of the fourth lens is a concave surface. The number of lenses having optical power in the optical lens is four, and the optical lens satisfies: -0.0152 mm-1≤R2 / R3 / F1≤0.0452 mm-1 and 0.5642≤(1 / F3+1 / F4)×F≤0.9315; wherein R2 is the central curvature radius of the second side of the first lens, R3 is the central curvature radius of the first side of the second lens, F1 is the focal length of the first lens, F3 is the focal length of the third lens, and F4 is the focal length of the fourth lens.

[0004] The second aspect of the present application provides such an electronic device, which comprises the optical lens in the above example embodiments, and at least one of an imaging element and a light source, wherein the imaging element is used to convert the optical image or optical information formed by the optical lens into an electrical signal, and the light source is located at the second side of the optical lens, and 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 at the first side of the optical lens.

[0005] The first side of the first lens is provided as a convex surface, which is conducive to converging the light beam, so that the diameter of the light beam received by the first lens is reduced, which helps to reduce the aperture size of the subsequent second lens, third lens and fourth lens, and ultimately helps to realize the miniaturization of the entire system and reduce the production cost. The second side of the first lens is provided as a concave surface, which can gently emit light to the rear system for imaging, avoiding steep edge light trend, which is conducive to reducing the incidence angle of each field of view main light and improving the system imaging quality.

[0006] The first side of the second lens is provided as a concave surface, and the second side of the second lens is provided as a convex surface, which can make the second lens be crescent and concave to the object side. Such design can reduce the angle of light incident on the second lens, which is conducive to balancing the convergence difference between the edge light and the near-axis light, and improving the image quality. In addition, the first side of the second lens is provided as a concave surface, which can further expand the aperture of the light and smoothly transition to the rear lens, which is conducive to the subsequent system for phase difference correction; the second side of the second lens is provided as a convex surface, which can also reduce the refraction angle of the light, thereby helping to reduce the aberration.

[0007] Further, the "cavity" formed between the two concave surfaces of the first lens second side and the second lens first side can buffer the light deflection, avoiding the concentration of spherical aberration and coma caused by excessive divergence or convergence of light. On this basis, by satisfying the relationship formula -0.0152mm -1 ≤R2 / R3 / F1≤0.0452mm -1 (R2 is the central curvature radius of the second side of the first lens, R3 is the central curvature radius of the first side of the second lens, and F1 is the focal length of the first lens), not only can the light trend between the two concave surfaces of the first lens second side and the second lens first side be more gentle, which helps to improve the light throughput, reduce the FNO, improve the imaging quality, but also can adapt to the off-axis light of the field of view, so that the propagation angle between the two concave surfaces is controllable, reduces the edge light vignetting, improves the full field of view imaging uniformity, balances the focal power distribution between the front and rear groups of lenses, and ensures high image quality and light efficiency.

[0008] The positive focal power design of the third lens is conducive to converging the light. Further, the fourth lens is designed to have a positive focal power, and the first side of the fourth lens is provided as a convex surface, which can make the fourth lens cooperate with the third lens, and the fourth lens can perform secondary convergence and collection on the light converged by the third lens and transmit it to the image plane of the system. On this basis, the design feature that the second side of the fourth lens is concave can make the fourth lens be crescent, so as to moderate the trend of the light converged by the front lens, which helps to reduce the system CRA (Chief Ray Angle, main light angle) and improve the imaging quality.

[0009] Moreover, by controlling the third lens and the fourth lens to satisfy the relationship formula 0.5642≤(1 / F3+1 / F4)xF≤0.9315 (F3 is the focal length of the third lens, and F4 is the focal length of the fourth lens), the light deflection capability of the lens group of the third lens and the fourth lens can be increased, and the whole optical lens can be ensured to mainly bear the converging task by the third lens and the fourth lens with positive optical power. By such a design, on the one hand, the third lens and the fourth lens can be ensured to quickly converge the front-end light, avoid lengthening the system length, help to reduce the optical total length of the optical lens and realize system miniaturization, and on the other hand, the light deflection degree can be moderate, the light transmission is smoother, and then the edge aberration and vignetting are reduced. By controlling the value of the relationship formula (1 / F3+1 / F4)xF to be between 0.5642 and 0.9315, the optical power of the third lens and the fourth lens can be reasonably configured, and then the system structure is more compact and helps to reduce the optical total length of the optical lens, so that the high imaging quality and miniaturization of the system are considered at the same time.

[0010] If the value of (1 / F3+1 / F4)xF is too large, it indicates that the optical power (the optical power is inversely proportional to the focal length) of the third lens and the fourth lens is too strong, the deflection angle of the light on the surface of the third lens and the fourth lens is too large, the refraction angle of the edge light is too large, the deflection difference between the edge light and the near-axis light is significant, and then the aberration (such as spherical aberration, coma) is concentrated. Specifically, the optical power of the third lens and the fourth lens is positive, and the excessive convergence of the third lens and the fourth lens to the light will cause the edge light to focus too strongly, and serious spherical aberration is easy to occur. Moreover, since the incidence angle of the off-axis light on the surface of the third lens and the fourth lens increases, the off-axis aberration such as coma and astigmatism is also deteriorated sharply, and the refraction angle of the edge light is too large, which is easy to be cut by the edge of the third lens and the fourth lens (i.e., “vignetting”), and the light amount decreases.

[0011] If the value of (1 / F3+1 / F4)xF is too small, it indicates that the optical power of the third lens and the fourth lens is too weak, and the converging / diverging task of the first lens and the second lens is heavy, and then the aberration (such as spherical aberration, coma) of the first lens and the second lens is concentrated, and since the third lens and the fourth lens are positive optical power design, the correction ability of negative aberration is limited, and thus it is difficult to compensate. BRIEF DESCRIPTION OF DRAWINGS

[0012] Other characteristics, objects and advantages of the present application will become more apparent from the following detailed description of non-restrictive embodiments made with reference to the attached drawings. Among them:

[0013] Figure 1a , Figure 2a , Figure 3a , Figure 4a , Figure 5a , Figure 6a, Figure 7a , Figure 8a , Figure 9a , Figure 10a , Figure 11a , Figure 12a , Figure 13a and Figure 14a The following are schematic diagrams of the optical lenses in Examples 1-14, respectively.

[0014] Figure 1b , Figure 2b and Figure 3b The following are the RMS (Root Mean Square Radius) plots of the optical lenses in Examples 1-3, respectively.

[0015] Figure 1c , Figure 2c and Figure 3c The diffraction entry energy diagrams of the optical lenses in Examples 1-3 are shown in sequence. Detailed Implementation

[0016] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0017] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0018] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0019] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness is not defined, 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 called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens.

[0020] It should also be understood that the use of the term "including", "including" and / or "having" when used in this specification intends to convey the inclusion of one or more features, elements, and / or components, but does not exclude 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" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0021] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0023] The features, principles and other aspects of the present application are described in detail below.

[0024] The optical lens according to the exemplary embodiments of the present application can include, for example, four lenses with optical power, 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.

[0025] In 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 the 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 for forming a projection image or detection light for detecting target object information, etc.

[0026] It can be understood that when the optical lens provided in the present application is used for 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 (such as a side where a photosensor or a retina is located), that is, light from the object side can be imaged on the image side, for example, the camera lens can be a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera and the like. When the optical lens provided in the present application is used for 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.

[0027] In some possible implementation manners, the optical lens provided in the present application can also simultaneously assume light receiving and light emitting functions. For example, the optical lens provided in the present application is used for a laser radar system sharing a light receiving and light emitting path, and the optical lens simultaneously assumes the functions of emitting laser and receiving a radar echo light beam. For another example, the optical lens provided in the present application is used for a system integrating optical communication and radar, and the optical lens simultaneously assumes the functions of emitting a modulated light signal and receiving a radar echo light beam.

[0028] In the example implementation, the first lens can have, for example, positive refractive power, the first side of the first lens is a convex surface, and the second side of the first lens is a concave surface. In this way, the first lens can be a meniscus lens concave to the image side. The first side of the first lens is designed as a convex surface, which is conducive to converging the light beam, so that the diameter of the light beam received by the first lens is reduced, which helps to reduce the aperture size of the subsequent second lens, third lens and fourth lens, and finally helps to realize the miniaturization of the entire system and reduce the production cost. The second side of the first lens is designed as a concave surface, which can gently emit light to the rear system for imaging, avoiding steep edge light trends, which is conducive to reducing the incidence angle of the chief ray of each field of view and improving the imaging quality of the system.

[0029] In the example implementation, the first lens can have, for example, negative refractive power, the first side of the first lens is a convex surface, and the second side of the first lens is a concave surface. In this way, the first lens can be a meniscus lens concave to the image side. The first side of the first lens is designed as a convex surface, which is conducive to converging the light beam, so that the diameter of the light beam received by the first lens is reduced, which helps to reduce the aperture size of the subsequent second lens, third lens and fourth lens, and finally helps to realize the miniaturization of the entire system and reduce the production cost. The second side of the first lens is designed as a concave surface, which can gently emit light to the rear system for imaging, avoiding steep edge light trends, which is conducive to reducing the incidence angle of the chief ray of each field of view and improving the imaging quality of the system.

[0030] In an example embodiment, the second lens can have, for example, positive refractive power, the first side surface of the second lens can be concave, and the second side surface of the second lens can be convex. In this way, the second lens can be a meniscus lens concave toward the object side, thereby reducing the angle of incidence of light rays on the second lens, which is conducive to balancing the convergence difference between marginal rays and paraxial rays and improving image quality. In addition, the first side surface of the second lens is designed to be concave, which can further expand the aperture of the light rays and smoothly transition to the rear lens, which is conducive to subsequent system phase difference correction. The second side surface of the second lens is designed to be convex, which can also reduce the refraction angle of the light rays, thereby helping to reduce aberration and achieve small aberration balance in the overall system.

[0031] In an example embodiment, the second lens can have, for example, negative refractive power, the first side surface of the second lens can be concave, and the second side surface of the second lens can be convex. In this way, the second lens can be a meniscus lens concave toward the object side, thereby reducing the angle of incidence of light rays on the second lens, which is conducive to balancing the convergence difference between marginal rays and paraxial rays and improving image quality. In addition, the first side surface of the second lens is designed to be concave, which can further expand the aperture of the light rays and smoothly transition to the rear lens, which is conducive to subsequent system phase difference correction. The second side surface of the second lens is designed to be convex, which can also reduce the refraction angle of the light rays, thereby helping to reduce aberration and achieve small aberration balance in the overall system.

[0032] In an example embodiment, the third lens has positive refractive power, the first side surface of the third lens can be, for example, convex, and the second side surface of the third lens can be, for example, convex. The third lens is designed with positive refractive power and further designed with double convexity, which can effectively converge light rays, so that the light rays reach the image plane faster, thereby helping to reduce the lens length. The marginal field of view light rays are deflected toward the optical axis after passing through the third lens designed with positive refractive power, which can help to reduce the rear aperture and preliminarily correct the aberration.

[0033] In an example embodiment, the third lens has positive refractive power, the first side surface of the third lens can be, for example, convex, and the second side surface of the third lens can be, for example, concave. The first side surface of the third lens is designed to be convex, which can converge the light rays appropriately, which is conducive to receiving the light rays emitted by the second lens and reducing the height of the light rays, thereby helping to reduce the aperture of the rear lens. The second side surface of the third lens is designed to be concave and the surface profile is relatively flat, which is conducive to the smooth transition of the light rays, thereby preliminarily correcting the aberration of the light rays incident on the third lens.

[0034] In an example embodiment, the third lens has positive refractive power, the first side surface of the third lens can be convex for example, and the second side surface of the third lens can be flat for example. The first side surface of the third lens is designed as convex, which can make the light rays converge properly, and is conducive to receiving the light rays emitted by the second lens and reducing the height of the light rays, thereby reducing the aperture of the rear lens.

[0035] In an example embodiment, the third lens has positive refractive power, the first side surface of the third lens can be concave for example, and the second side surface of the third lens can be convex for example. The first side surface of the third lens is designed as concave, and the surface profile is relatively flat, which is conducive to the smooth transition of light rays and reduces the aberration of the emitted light rays. The second side surface of the third lens is designed as convex, which can make the light rays converge properly, and is conducive to reducing the height of the emitted light, thereby reducing the aperture of the rear lens.

[0036] In an example embodiment, the third lens has positive refractive power, the first side surface of the third lens can be flat for example, and the second side surface of the third lens can be convex for example. The first side surface of the third lens is designed as flat, which not only facilitates processing, but also can avoid uneven divergence or convergence of light rays caused by curved surface incidence when receiving the light rays emitted by the front group of lenses, reduces the accumulation of high-order aberrations, and is conducive to the control of aberrations. The second side surface of the third lens is designed as convex, which can make the light rays converge properly, and is conducive to reducing the height of the emitted light, thereby reducing the aperture of the rear lens.

[0037] In an example embodiment, the fourth lens has positive refractive power, the first side surface of the fourth lens is convex, and the second side surface of the fourth lens is concave. The first side surface of the fourth lens is designed as convex, which can make the fourth lens cooperate with the third lens, and the fourth lens can perform secondary convergence on the light rays converged by the third lens and transmit the light rays to the image plane of the system. On this basis, the second side surface of the fourth lens is designed as concave, which can make the fourth lens have a crescent shape, so as to moderate the trend of the light rays converged by the front lens, thereby reducing the CRA of the system and improving the imaging quality.

[0038] In an example embodiment, the optical lens can further include a diaphragm, which can be arranged between the first lens and the second lens for example. By arranging the diaphragm between the first lens and the second lens, the light rays can be concentrated at the front end of the lens, the front end aperture of the optical system can be reduced, and the light rays can be quickly converged after passing through the diaphragm, which is conducive to reducing the total optical length of the optical lens and facilitating the miniaturization of the system. It should be understood that the arrangement of the diaphragm between the first lens and the second lens is only exemplary, and the present application does not make specific limitations thereon, and the diaphragm can also be arranged at other positions according to actual needs.

[0039] In an example embodiment, the first side of the first lens and the second side of the first lens have at least one inflection point.

[0040] In an example embodiment, the first lens can have one or more aspheric surfaces, which can be located in front of the stop. The field rays have not yet converged on the aspheric surface, which can be beneficial for correcting field curvature and improving image quality.

[0041] In an example embodiment, the optical lens can further include a filter located between the fourth lens and the image plane to filter light rays having different wavelengths. The optical lens can further include a protective glass located between the filter and the image plane to prevent damage to internal components (e.g., a chip) of the optical lens as needed.

[0042] In an example embodiment, 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).

[0043] In an example embodiment, the optical lens satisfies: 0.85≤F / ENPD≤1.15. Preferably, F / ENPD=1.0. In this way, the FNO can be reduced, which is beneficial for increasing the light flux and the entrance pupil diameter and helps to improve the laser radar echo receiving energy and the ranging capability.

[0044] In an example embodiment, the optical lens satisfies: 0.069≤TTL / H / FOVx1°≤0.1385. Preferably, 0.081≤TTL / H / FOVx1°≤0.12. In this way, the length of the lens can be effectively limited with a fixed ratio between the image height and the maximum field of view, which is beneficial for miniaturization of the lens.

[0045] In an example embodiment, the optical lens satisfies: 0.475≤(Fxθ) / D≤0.7689. Preferably, 0.559≤(Fxθ) / D≤0.669. In this way, the front end diameter of the lens can be reduced, which helps to reduce the volume of the imaging system.

[0046] In an example embodiment, the optical lens satisfies: 0.0263≤D / H / FOVx1°≤0.0513. Preferably, 0.031≤D / H / FOVx1°≤0.045. In this way, the maximum light flux diameter of the lens can be effectively limited with a fixed ratio between the image height and the maximum field of view, which is beneficial for miniaturization of the lens.

[0047] In an example embodiment, the optical lens satisfies: 0.177mm -1≤D / H / F≤0.2872mm -1 . Preferably, 0.208mm -1 ≤D / H / F≤0.25mm -1 . In this way, the optical lens can meet the characteristics of large image height and small aperture under the condition that the focal length of the optical lens is fixed.

[0048] In the example embodiment, the optical lens satisfies: 0.2247≤F3 / F4≤1.2551. Preferably, 0.264≤F3 / F4≤1.091. F3 / F4 has a significant impact on the light deflection ability of the middle part of the optical system. By reasonably setting the ratio of F3 and F4, the light can be smoothly transitioned, and the resolving power can be improved. If F3 / F4 is too small, it means that the third lens has too strong a light converging ability, which can cause the aberration to intensify, the depth of field to narrow, the dark corner, the local overexposure, and the focusing difficulty, thereby reducing the resolving power. If F3 / F4 is too large, it means that the third lens has a weak light converging ability, and the light converging effect is low. On the contrary, the fourth lens has a strong light converging ability, which can also cause the resolving power to decrease.

[0049] In the example embodiment, the optical lens satisfies: 1.5356≤F3 / F≤3.1688. Preferably, 1.806≤F3 / F≤2.756. In this way, the optical path required for the light converging to the image plane by the third lens can be shortened, which is helpful to reduce the total optical length of the optical lens. The focal length of the optical lens and the focal length of the third lens are both positive values. If F3 / F is too small, it means that the focal length of the third lens is too small, and the light converging ability of the third lens is too strong, which can cause the light to converge too fast and is not conducive to the improvement of the resolving power. If F3 / F is too large, although the light can be quickly converged to the image plane, the light emitted by the third lens is relatively divergent, and the aberration correction ability is insufficient, which increases the difficulty of subsequent aberration correction.

[0050] In the example embodiment, the optical lens satisfies: 2.1461≤F4 / F≤8.0349. Preferably, 2.525≤F4 / F≤6.987. In this way, the optical path required for the light converging to the image plane by the fourth lens can be shortened, which is helpful to reduce the total optical length of the optical lens. The focal length of the optical lens and the focal length of the fourth lens are both positive values. If F4 / F is too small, it means that the focal length of the fourth lens is too small, and the light converging ability of the fourth lens is too strong, which can cause the light to converge too fast and is not conducive to the improvement of the resolving power. If F4 / F is too large, although the light can be quickly converged to the image plane, the light emitted by the fourth lens is relatively divergent, and the aberration correction ability is insufficient.

[0051] In the example embodiments, the optical lens satisfies: 0.4799≤CT3 / CT4≤1.3088. Preferably, 0.565≤CT3 / CT4≤1.138. In this way, the third lens and the fourth lens can have similar central thicknesses, so that the light rays can be more smoothly converged to the image plane, thereby the optical lens has smaller deflection of the light rays in high-temperature environment and low-temperature environment, which helps to improve the temperature performance of the optical lens.

[0052] In the example embodiments, the optical lens satisfies: 0.09095≤T_DIR / TTL≤0.2047. Preferably, 0.107≤T_DIR / TTL≤0.178. In this way, the total sum of the gaps between the adjacent lenses in the optical lens can be effectively limited in the total optical length, so as to control the proportion of the invalid space, which helps to realize the compactness of the optical lens structure. In addition, the reduction of the gaps between the adjacent lenses also means the increase of the coupling degree between the lenses.

[0053] In the example embodiments, the optical lens satisfies: 0.1343≤L_stop / TTL≤0.2415. Preferably, 0.158≤L_stop / TTL≤0.21. In this way, the stop can be relatively close to the first lens, which helps to reduce the overall length of the system and improve the light flux of the system.

[0054] In the example embodiments, the optical lens satisfies: 0.9638≤F34 / F≤1.6758. Preferably, 1.134≤F34 / F≤1.457. In this way, the combined focal length of the third lens and the fourth lens can be moderate, so that the third lens and the fourth lens can not only quickly converge the divergent light rays at the front end to prevent the system length from being too long, which helps to realize miniaturization, but also can avoid the concentration of aberrations (such as spherical aberration and field curvature), which facilitates the cooperative correction of aberrations. In addition, controlling the value of F34 / F in the above range also ensures that the combined focal length of the third lens and the fourth lens is close to or slightly greater than the total focal length of the system, so as to ensure that the third lens and the fourth lens mainly undertake the task of converging light rays, which can make the off-axis light rays propagate more stably, thereby helping to reduce the aberrations at the edge. The values of F34 and F are also comparable, which helps to compress the total length of the system and realize miniaturization, and also makes the light transmission more smooth, which helps to improve the uniformity of light transmission and realizes the balance between high image quality and compact structure.

[0055] In the example embodiments, the optical lens satisfies: 2.6149≤TTL / F≤4.2671. Preferably, 3.076≤TTL / F≤3.71. In this way, the length of the optical lens can be effectively limited, which helps to realize the miniaturization of the lens.

[0056] In exemplary embodiments, the optical lens satisfies: 0.046≤ST-fobj / F / FOVx1°≤0.0785. Preferably, 0.054≤ST-fobj / F / FOVx1°≤0.068. In this way, the distance between the stop and the object-side focal point is further, which is beneficial to reduce the front length of the optical system, and further beneficial to reduce the total length of the optical lens and achieve miniaturization.

[0057] In exemplary embodiments, the optical lens satisfies: -2.681≤R2 / R3≤-0.6156. Preferably, -2.331≤R2 / R3≤-0.724. The second side surface of the first lens and the first side surface of the second lens are opposite concave surfaces, and the positive and negative properties of the center curvature radii thereof are opposite. By satisfying the above relationship of R2 / R3, the large aberration near compensation can be achieved in the process of the light entering the second lens from the first lens, which is beneficial to achieve the small aberration balance of the whole system and improve the image quality. In addition, since the first side surface of the second lens is concave, the light aperture can be expanded from here, which is beneficial to the aberration correction of the subsequent lens and improves the image quality.

[0058] In exemplary embodiments, the optical lens satisfies: 0.3385≤SAG7 / (D7 / 2)≤0.6385. Preferably, 0.398≤SAG7 / (D7 / 2)≤0.555. In this way, the fourth lens can compress the front light beam, thereby ensuring the small aperture feature of the fourth lens, which is beneficial to achieve the miniaturization of the system.

[0059] In exemplary embodiments, the optical lens satisfies: 0.1737≤SAG8 / (D8 / 2)≤0.3808. Preferably, 0.204≤SAG8 / (D8 / 2)≤0.331. In this way, the light ray trend at the second side surface of the fourth lens can be effectively controlled, and the opening angle thereof can be maintained within a certain range, which is beneficial to achieve high resolution of the system.

[0060] In exemplary embodiments, the optical lens satisfies: 0.16575≤(R8-CT4) / R7≤1.12585. Preferably, 0.195≤(R8-CT4) / R7≤0.979. The fourth lens is a meniscus lens with positive refractive power, which plays a role in converging light in the rear group of the system. By controlling (R8-CT4) / R7 within the above relationship, the tolerance sensitivity of the whole system can be effectively reduced.

[0061] In exemplary embodiments, the optical lens satisfies: 1.005≤F / H≤1.705. Preferably, 1.182≤F / H≤1.483. In this way, the imaging quality of the system can be improved.

[0062] In the example embodiment, the optical lens satisfies: F1 / F≤-5.1644 or 18.7791≤F1 / F≤32.1480. Preferably, -202.304≤F1 / F≤-6.076 or 22.094≤F1 / F≤27.956. When F1 / F≤-5.1644, the specific value of F1 / F can further tend to negative infinity. F1 / F can at most satisfy only one of the two relational expressions F1 / F≤-5.1644 and 18.7791≤F1 / F≤32.1480. In this way, the absolute value of the optical power of the first lens is limited to be much smaller than the absolute value of the total optical power of the system, thereby achieving a dispersed distribution of the optical power among the four lenses, avoiding a single lens from bearing too heavy a task of deflecting light, and thereby controlling the aberration within a range that can be compensated by each lens. Specifically, when the focal length of the first lens is positive and satisfies 18.7791≤F1 / F≤32.1480, the refractive ability of the first lens is gentle, and only slightly deflects the incident light, at which time the light converging task is mainly completed by the rear group of lenses. This design method can avoid the first lens from generating serious aberration due to bearing too heavy a deflection task, while also allowing light to be incident. When the focal length of the first lens is negative and F1 / F≤-5.1644, the absolute value of the focal length of the first lens is much larger than the absolute value of the total focal length of the optical lens, at which time the diverging ability of the first lens is extremely weak, and the first lens can slightly “pull apart” the incident light in advance, avoiding subsequent generation of field curvature, astigmatism and other off-axis aberrations due to excessive convergence of light by the third and fourth lenses. The weak diverging characteristic of the first lens can pre-adjust the incident angle of the off-axis light, whereby the third and fourth lenses have a smaller difference in the light path between the edge light and the center light when converging the light, thereby significantly improving the clarity and distortion control of the field edge. In addition, the weak diverging characteristic of the first lens also avoids excessive deflection of the edge light beyond the light transmission range of the subsequent third and fourth lenses (i.e., reduces vignetting), ensuring the uniformity of light transmission in the full field of view, and balancing the large light transmission and edge illumination.

[0063] In exemplary embodiments, the optical lens satisfies: 0.5642≤(1 / F3+1 / F4)xF≤0.9315. Preferably, 0.664≤(1 / F3+1 / F4)xF≤0.81. By controlling the third lens and the fourth lens to satisfy the relationship 0.5642≤(1 / F3+1 / F4)xF≤0.9315, the light deflection ability of the lens group of the third lens and the fourth lens can be increased, and the convergence task of the entire optical lens can be ensured to be mainly borne by the third lens and the fourth lens with positive focal power. In this way, on the one hand, the third lens and the fourth lens can quickly converge the front light, avoid lengthening the system length, and help to reduce the total optical length of the optical lens and realize system miniaturization, and on the other hand, the light deflection degree can be moderate, and the light transmission is more smooth, thereby reducing the edge aberration and vignetting. By controlling the value of (1 / F3+1 / F4)xF to be between 0.5642 and 0.9315, the focal power of the third lens and the fourth lens can be reasonably configured, thereby making the system structure more compact and helping to reduce the total optical length of the optical lens, so as to simultaneously consider the high imaging quality and miniaturization of the system.

[0064] In exemplary embodiments, the optical lens satisfies: -0.13915≤(1 / F1+1 / F2) / (1 / F3+1 / F4)≤0.20355. Preferably, -0.121≤(1 / F1+1 / F2) / (1 / F3+1 / F4)≤0.177. In this way, the front group comprehensive focal power and the rear group comprehensive focal power in the entire optical lens system can be compared, the distribution of the overall focal power of the system is more reasonable, which helps to realize aberration collaborative correction, balanced distribution of light beam energy, and improvement of system stability. Since the absolute value of the focal power of the front group is much smaller than that of the rear group, the aberration introduced by the front group can be ignored, and only plays a "fine tuning compensation" role, which helps to realize the balance of the full field of view aberration. In addition, the ratio limitation of the focal power between the front group and the rear group of the system can also ensure the smooth transition of the light beam between the front group and the rear group, and avoid excessive diffusion or convergence of the light beam.

[0065] In exemplary embodiments, the optical lens satisfies: 0.0838≤T12 / TTL≤0.1949. Preferably, 0.099≤T12 / TTL≤0.169. In this way, the interval length between the first lens and the second lens in the total length of the system can be controlled within a certain range, on the one hand, to avoid the system being too long to affect the system miniaturization, and on the other hand, to avoid the interval between the first lens and the second lens being too short, so that the diaphragm can smoothly transition the light, which is beneficial to the improvement of the image quality.

[0066] In exemplary embodiments, the optical lens satisfies: 0.006≤(T23+T34) / TTL≤0.0101. Preferably, 0.007≤(T23+T34) / TTL≤0.009. With such design, it is beneficial to shorten the transmission distance of light and realize the miniaturization of the optical system. In addition, the short interval design between the second lens and the third lens and the short interval design between the third lens and the fourth lens also make the light transmission between the second lens, the third lens and the fourth lens more compact, reduce the aberration accumulation (such as spherical aberration, coma) of light in the air interval, and facilitate the cooperative correction of aberration. By controlling the value of (T23+T34) / TTL, the off-axis light propagation can also be more stable, avoiding the vignetting caused by excessive diffusion of off-axis light, which helps to improve the uniformity of light transmission.

[0067] In exemplary embodiments, the optical lens satisfies: 10.2462≤T12 / (T23+T34)≤23.2386. Preferably, 12.079≤T12 / (T23+T34)≤20.205. With such design, on the one hand, it can avoid affecting the system miniaturization, and on the other hand, it can keep enough interval between the first lens and the second lens, so that the light near the stop can transition smoothly, which is beneficial to improve the image quality. The above relationship shows that T12 is much larger than T23+T34. T12 is larger, which can provide sufficient adjustment space for off-axis light, and the deflection of off-axis light when passing through the first lens and the second lens is relatively gentle, which helps to reduce the accumulation of aberration in the front group of the system. T34 is small, which can ensure that the third lens and the fourth lens which bear the main convergence task are arranged more compactly, facilitating the cooperative correction of aberration (such as spherical aberration, field curvature). The design of larger T12 and smaller T23 and T34 can balance the stability of light transmission and system miniaturization, and improve the uniformity of light transmission in the full field of view.

[0068] In exemplary embodiments, the optical lens satisfies: 3.9693° / mm≤FOV / F≤9.0403° / mm. Preferably, 4.67° / mm≤FOV / F≤7.861° / mm. With such design, it is beneficial to realize small distortion of the system and high imaging quality.

[0069] In the exemplary embodiments, the optical lens satisfies: F2 / F≤-12.3364 or 5.5569≤F2 / F≤20.5890. Preferably, -170.367≤F2 / F≤-14.513 or 6.537≤F2 / F≤17.902. In this way, the absolute value of the focal length of the second lens is much greater than the total focal length of the system, so that the power of the second lens is extremely weak, and the second lens can be a fine-tuning element of the front group of the system. When F2 is negative and satisfies F2 / F≤-12.3364, the second lens has weak divergence ability for light, thereby offsetting the excessive convergence of aberration of the rear group of lenses, optimizing the off-axis beam path, and reducing vignetting. When F2 is positive and satisfies 5.5569≤F2 / F≤20.5890, the second lens has weak convergence ability for light, which can converge the divergent light of the front group of the system, suppresses coma and distortion, and helps to shorten the total length of the system and achieve miniaturization. Regardless of whether F2 satisfies F2 / F≤-12.3364 or 5.5569≤F2 / F≤20.5890, the second lens balances aberration and light transmission in a weak intervention manner.

[0070] In the exemplary embodiments, the optical lens satisfies: 0.5878≤(1 / F2+1 / F3+1 / F4)×F≤0.9397. Preferably, 0.692≤(1 / F2+1 / F3+1 / F4)×F≤0.817. In this way, the relationship between the power of the rear group of the system and the overall power of the system can be controlled, thereby having a good control effect on astigmatism and distortion. In addition, when (1 / F2+1 / F3+1 / F4)×F is close to 1, the power of the system is balanced, avoiding local overcorrection and improving the overall image quality.

[0071] In the exemplary embodiments, the optical lens satisfies: 0.3108≤D / TTL≤0.4968. Preferably, 0.366≤D / TTL≤0.432. In this way, the overall miniaturization of the system is facilitated.

[0072] In the exemplary embodiments, the optical lens satisfies: -0.0152mm -1 ≤R2 / R3 / F1≤0.0452mm -1 . Preferably, -0.013mm -1 ≤R2 / R3 / F1≤0.039mm -1 . In this way, the light path between the first lens and the second lens is relatively smooth, which is conducive to improving the imaging quality and the amount of light transmission and reducing the FNO.

[0073] In the exemplary embodiments, the optical lens satisfies: 0.5113≤D / Dmax(D3~D8)≤0.9054. Preferably, 0.601≤D / Dmax(D3~D8)≤0.787. In this way, the aperture of the front end of the lens is reduced.

[0074] In the example embodiment, the optical lens satisfies: Dmax(D5, D6, D7) > Dmax(D3, D4, D8). With such a design, the third lens and the fourth lens with positive refractive power can receive and control more light beams in a larger field of view, thereby taking on the main tasks of light convergence and aberration balancing, which not only effectively compresses the main light ray angle, but also significantly suppresses the astigmatism, field curvature and distortion of the edge field of view. In addition, the above relationship also relaxes the stringent requirements on the first lens and the second lens, which is conducive to realizing a more compact and easier-to-process front lens structure.

[0075] In the example embodiment, the optical lens satisfies: Dmin(D5, D6, D7) > Dmax(D3, D4, D8). In other words, the maximum value among D3, D4, D5, D6, D7 and D8 must be one of D5, D6 and D7. With such a design, firstly, the third lens and the fourth lens can receive more light, thereby improving the radar detection sensitivity in weak light environment; secondly, the second lens has a smaller light aperture, thereby controlling the light incidence angle of the front and middle sections of the lens, reducing the light cutting (dark angle) of the edge of the field of view, and ensuring the uniformity of the light in the field of view; thirdly, the third lens and the fourth lens have large aperture characteristics on the basis of positive refractive power, which can effectively undertake the task of light convergence and suppress the generation of spherical aberration and other aberrations, thereby avoiding the overlarge system front and middle section lenses and balancing the volume and detection performance of the lens.

[0076] In the example embodiment, the optical lens satisfies: 0.6813 ≤ D / D8 ≤ 1.6129. Preferably, 0.6813 ≤ D / D8 ≤ 1.5. Further preferably, 0.802 ≤ D / D8 ≤ 1.402. With such a design, it is conducive to controlling the overall volume of the lens within a smaller range, which is conducive to overall miniaturization.

[0077] In the example embodiment, the optical lens satisfies: 1 < D / D2 ≤ 1.6554. Preferably, 1.117 ≤ D / D2 ≤ 1.44. With such a design, it is conducive to controlling the light vignetting and stray light performance.

[0078] In the example embodiment, the optical lens satisfies: 1 < D2 / D3 ≤ 1.2831. Preferably, 1.019 ≤ D2 / D3 ≤ 1.116. With such a design, it is conducive to preventing diffraction stray light caused by aperture mutation and avoiding high aberration.

[0079] In the example embodiment, the optical lens satisfies: 0.7858 ≤ R1 / R2 ≤ 2.6164. Preferably, 0.924 ≤ R1 / R2 ≤ 2.275. With such a design, the shape of the first lens is relatively normal, which is conducive to processing. In addition, such a shape design of the first lens can also reduce the spherical aberration and improve the overall image quality.

[0080] In the example embodiment, the optical lens satisfies: 0.6132≤R3 / R4≤1.07. Preferably, 0.721≤R3 / R4≤0.93. In this way, the shape of the second lens is relatively normal, facilitating processing. In addition, this shape of the second lens can reduce spherical aberration and improve overall image quality.

[0081] In the example embodiment, the optical lens satisfies: -3.8221≤R1 / R4≤-0.5964. Preferably, -3.324≤R1 / R4≤-0.702. In this way, the system as a whole does not produce large aberrations, and some aberrations are complementary.

[0082] In the example embodiment, the optical lens satisfies: 0.12≤BFL / TTL≤0.3012. Preferably, 0.141≤BFL / TTL≤0.262. In this way, the optical back focal length of the lens is reasonably controlled, which is conducive to miniaturization and also reserves sufficient space for the installation and focusing of optical elements, avoiding mutual interference between elements.

[0083] In the example embodiment, the optical lens satisfies: 5.2488≤(F3+F4) / BFL≤20.8271. Preferably, 6.175≤(F3+F4) / BFL≤18.112. In this way, the back focal length is not too short due to the small focal length of the third lens and the fourth lens, which is conducive to flat image surface and wide tolerance.

[0084] In the example embodiment, the optical lens satisfies: 2.8959≤F4 / BFL≤16.4713. Preferably, 3.407≤F4 / BFL≤14.324. In this way, the surface shape of the fourth lens does not develop towards the plano-convex combination, which helps the fourth lens to participate in the balance and compensation of aberrations, improving overall image quality.

[0085] In the example embodiment, the optical lens satisfies: 0.6839≤CT1 / (CT1+SAG2-SAG1)≤1.4393. Preferably, 0.805≤CT1 / (CT1+SAG2-SAG1)≤1.252. In this way, the first lens edge is not too thin, facilitating processing, and the center thickness and edge thickness of the first lens are maintained within a suitable ratio, thereby reducing the refractive difference of light rays at different incident heights and effectively correcting spherical aberration and positional chromatic aberration. In addition, by maintaining the ratio of the center thickness and the edge thickness of the first lens within a reasonable range, the number of reflections of light rays in the lens can be effectively reduced (excessive center thickness increases the probability of internal reflection), the local refractive index deviation caused by uneven thickness (uneven stress release of the material) can be avoided, and uniform light transmission can be ensured, maintaining the stability of high light flux.

[0086] In the example embodiment, the optical lens satisfies: 0.9921≤CT2 / (CT2+SAG4-SAG3)≤1.6132. Preferably, 1.167≤CT2 / (CT2+SAG4-SAG3)≤1.403. By such design, the second lens edge can be avoided from being too thin, facilitating processing. The second lens needs to carry and correct the residual off-axis aberration and residual chromatic aberration of the first lens. By controlling CT2 / (CT2+SAG4-SAG3) within the value range of the above relationship, the propagation path of off-axis light in the second lens can be ensured to be smooth, so that the first side of the second lens and the second side of the second lens form complementary correction. By adjusting the thickness gradient, the residual coma of the first lens can be offset and the astigmatism can be reduced.

[0087] In the example embodiment, the optical lens satisfies: 1.2155≤CT4 / (CT4+SAG8-SAG7)≤2.3941. Preferably, 1.43≤CT4 / (CT4+SAG8-SAG7)≤2.082. By such design, the fourth lens edge can be avoided from being too thin, facilitating processing. By limiting CT4 through the above relationship, it can be ensured that the fourth lens still has sufficient mechanical strength under small aperture, avoiding processing deformation and assembly deformation caused by the fourth lens being too thin. By controlling CT4 / (CT4+SAG8-SAG7) to satisfy the above relationship, the center thickness and aperture of the fourth lens can be matched with each other. It helps to ensure that the propagation of the light beam in the small aperture is free from edge occlusion, which is conducive to the overall small aperture design of the system. In addition, by satisfying the above relationship, the power of the fourth lens can also be precisely controlled, thereby compensating for the residual aberration (such as higher-order spherical aberration and chromatic aberration) generated by the first three lenses. The above relationship can also control the difference in sagittal height between the second side of the fourth lens and the first side of the fourth lens, thereby controlling the reasonable bending of the fourth lens surface, ensuring the refraction path of light beams of different fields of view in the fourth lens to be uniform, and finally improving the imaging resolution, contrast, and consistency of the image quality of the edge field of view.

[0088] In the example embodiments, the optical lens satisfies: -0.1034≤(1 / F1+1 / F2)xF≤0.1383. Preferably, -0.09≤(1 / F1+1 / F2)xF≤0.12. By such design, the distribution of the front group focal power and the overall system focal power can be controlled, and thus the field curvature and distortion can be better controlled, which is conducive to reducing the distortion. The above relationship indicates that the total focal power of the first lens and the second lens is much smaller than the total focal power of the system, in other words, the focal power of the first lens and the second lens is extremely weak. Therefore, the first lens and the second lens can only slightly deflect the light rays, avoiding interfering with the convergence task of the third lens and the fourth lens. In addition, the extremely weak focal power design of the first lens and the second lens can also avoid generating a large amount of aberration by itself, assisting in correcting the spherical aberration and field curvature of the third lens and the fourth lens, ensuring smooth transition of the light beam, and reducing the edge light ray vignetting under the field of view. In addition, the low proportion of the focal power of the first lens and the second lens in the total focal power of the system can make the total focal power of the system more stable, reduce the influence of assembly error, and thus balance high image quality and mass production.

[0089] In the example embodiments, the optical lens satisfies: 0.7429≤R8 / F≤2.2477. Preferably, 0.874≤R8 / F≤1.955. By such design, the fourth lens can shape and converge the light rays on the second side, which is conducive to shortening the system back focal length and making the illumination of the entire optical system controllable.

[0090] In the example embodiments, the optical lens satisfies: 1.5229≤R8 / BFL≤2.7754. Preferably, 1.792≤R8 / BFL≤2.413. By such design, the fourth lens can shape and converge the light rays on the second side, and the included angle between the fourth lens second side and the light rays will be smaller, thereby avoiding generating large aberration and being conducive to improving the image quality.

[0091] Where F is the focal length of the optical lens, 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 F34 is the combined focal length of the third and fourth lenses; CT1 is the center thickness of the first lens, T12 is the center distance between the second side surface of the first lens and the first side surface of the second lens, CT2 is the center thickness of the second lens, T23 is the center distance between the second side surface of the second lens and the first side surface of the third lens, CT3 is the center thickness of the third lens, T34 is the center distance between the second side surface of the third lens and the first side surface of the fourth lens, CT4 is the center thickness of the fourth lens, T_DIR is the sum of T12, T23, and T34, and L_ `stop` is the distance between the first side surface of the first lens and the aperture stop; `ST-fobj` is the distance between the aperture stop and the image plane; `R1` is the central radius of curvature of the first side surface of the first lens; `R2` is the central radius of curvature of the second side surface of the first lens; `R3` is the central radius of curvature of the first side surface of the second lens; `R4` is the central radius of curvature of the second side surface of the second lens; `R7` is the central radius of curvature of the first side surface of the fourth lens; `R8` is the central radius of curvature of the second side surface of the fourth lens; `SAG1` is the sagitta of the first side surface of the first lens; `SAG2` is the sagitta of the second side surface of the first lens; `SAG3` is the sagitta of the first side surface of the second lens; `SAG4` is the sagitta of the second side surface of the second lens; `SAG7` is the sagitta of the first side surface of the fourth lens; `SA`... G8 is the sagitta of the second side surface of the fourth lens; D is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the first lens; D2 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the first lens; D3 is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the second lens; D4 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the second lens; D5 is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the third lens; D6 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the third lens; D7 is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the fourth lens; D8 is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the fourth lens; D8 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the third lens; D9 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the third lens; D0 is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the fourth lens; D1 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the third lens; D2 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the third lens; D1 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the third lens; D2 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the first ...3 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the first lens; D4 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the first lens; D Dmax is the aperture diameter on the second side of the fourth lens corresponding to the maximum field of view of the optical lens; Dmax(D3~D8) is the maximum value among D3, D4, D5, D6, D7 and D8; Dmax(D5, D6, D7) is the maximum value among D5, D6 and D7; Dmax(D3, D4, D8) is the maximum value among D3, D4 and D8; Dmin(D5, D6, D7) is the minimum value among D5, D6 and D7; TTL is the total optical length of the optical lens; 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; FOV is the maximum field of view of the optical lens; θ is the radian value corresponding to the maximum field of view of the optical lens; BFL is the optical back focal length of the optical lens.

[0092] 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 allocating the optical parameters of each lens, the optical lens is small in aperture and size, high in resolution, low in sensitivity, large in angular resolution, large in field of view, long in back focal length, small in distortion, small in chief ray angle, high in illumination, and processable, and can be well matched with, for example, a vehicle-mounted chip without causing a dark corner phenomenon. The optical lens has good temperature performance, and the imaging effect changes little at high and low temperatures, and the image quality is stable. Therefore, the optical lens according to the above embodiments of the present application can better meet the requirements of, for example, vehicle-mounted applications.

[0093] It should be understood by those skilled in the art 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 surface or image source surface; the back focal length BFL of the optical lens is the axial distance from the second side of the fourth lens to the imaging surface or image source surface; and the maximum field of view FOV of the optical lens is related to the image height H, which refers to the corresponding field of view using the image height H.

[0094] However, it should be understood by those skilled in the art 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 present 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.

[0095] The specific embodiments of the optical lens applicable to the above embodiments are further described below with reference to the accompanying drawings. It should be understood that the units of the basic parameters of the optical lens, such as the radius of curvature, the thickness / distance, the focal length, and the height of the principal ray, are mm.

[0096] Embodiment 1

[0097] The following refers to Figure 1a An optical lens according to Embodiment 1 of the present application is described. As shown in FIG. 1, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. A stop STO can be disposed between the first lens L1 and the second lens L2. Figure 1a The first lens L1 has a negative focal power, the first side S1 thereof is a convex surface, and the second side S2 thereof is a concave surface.

[0098] The second lens L2 has a negative focal power, the first side S3 thereof is a concave surface, and the second side S4 thereof is a convex surface.

[0099] The third lens L3 has a positive focal power, the first side S5 thereof is a convex surface, and the second side S6 thereof is a convex surface.

[0100] The fourth lens L4 has a positive focal power, the first side S7 thereof is a convex surface, and the second side S8 thereof is a concave surface.

[0101] The fourth lens L4 has positive refractive power, the first side S7 is convex, and the second side S8 is concave.

[0102] The second side of the optical lens is provided with an image plane IMA, and the fourth lens L4 is provided with an optical filter IR between the image plane IMA. The optical filter IR has a first side S9 and a second side S10. When the IMA is an imaging plane, light from an object sequentially passes through each surface and is finally imaged on the IMA. When the IMA is an image source plane, light from the IMA sequentially passes through each surface and is finally projected on the object.

[0103] Table 1 shows the basic parameter table of the optical lens of embodiment 1.

[0104] Table 1

[0105]

[0106] In embodiment 1, the first side S1 of the first lens L1 and the second side S2 of the first lens L1 are both aspherical surfaces, and the surface type of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0107] ;

[0108] wherein x is the distance from the vertex of the aspherical surface when the aspherical surface is at a height h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 shows the conic coefficient k and the high-order term coefficients A4, A6, A8, A10, A12 and A14 that can be used for each aspherical surface S1 and S2 in embodiment 1.

[0109] Table 2

[0110]

[0111] The MTF value of the optical lens of embodiment 1 at a spatial frequency of 17 lp / mm (17 lines per millimeter) is greater than 0.71. As shown in the point spread function RMS, the root mean square radius of the spot on the image plane at the edge field is 12 μm; as shown in the diffraction circle energy, the circular diameter on the image plane at the ratio of the spot energy to the total light energy of 90% is less than 20 μm. The optical lens given in embodiment 1 has high resolving power. Figure 1b Figure 1c The optical lens of embodiment 1 has high resolving power.

[0112] Embodiment 2

[0113] The optical lens according to embodiment 2 of the present application is described below with reference to Figure 2a . ​

[0114] As Figure 2a shown, the main difference between this embodiment and embodiment 1 is that the optical parameters of the radii of curvature of the surfaces of the lenses, the thickness of the lenses, etc. are different; the optical power of the second lens L2 is positive; and the first side surface S1 of the first lens L1 and the second side surface S2 of the first lens L1 have at least one inflection point.

[0115] Table 3 shows the basic parameter table of the optical lens of embodiment 2.

[0116] Table 3

[0117]

[0118] In embodiment 2, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces, and table 4 shows the conic coefficients and high-order term coefficients of the aspherical surfaces used in embodiment 2.

[0119] Table 4

[0120]

[0121] The MTF value of the optical lens of embodiment 2 at a spatial frequency of 17 lp / mm (17 lines per millimeter) is more than 0.75. As Figure 2b shown, in terms of point spread function RMS, the root mean square radius of the spot on the image plane at the edge field is 12 pm; as Figure 2c shown, in terms of diffraction circle energy, at a ratio of 90% of the spot energy to the total light energy, the circle diameter on the image plane is less than 20 pm. The optical lens given in embodiment 2 has high resolving power.

[0122] Embodiment 3

[0123] The optical lens according to embodiment 3 of the present application is described below with reference to Figure 3a As Figure 3a shown, the main difference between this embodiment and embodiment 1 is that the optical parameters of the radii of curvature of the surfaces of the lenses, the thickness of the lenses, etc. are different. Table 5 shows the basic parameter table of the optical lens of embodiment 3.

[0124] Table 5

[0125]

[0126] In embodiment 3, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces, and table 6 shows the conic coefficients and high-order term coefficients of the aspherical surfaces used in embodiment 3.

[0127] Table 6

[0128]

[0129] The MTF value of the optical lens of Example 3 at a spatial frequency of 17 lp / mm (17 lines per millimeter) exceeds 0.76. As shown in the spot diagram RMS, the root mean square radius of the spot on the image plane at the edge field is 12 μm; as shown in the encircled energy, the diameter of the circle on the image plane at the point where the spot energy accounts for 90% of the total light energy is less than 20 μm. The optical lens given in Example 3 has high resolving power. Figure 3b Figure 3c

[0130] Example 4

[0131] The optical lens according to Example 4 of the present application is described below with reference to Figure 4a As shown in the spot diagram RMS, the root mean square radius of the spot on the image plane at the edge field is 14 μm; as shown in the encircled energy, the diameter of the circle on the image plane at the point where the spot energy accounts for 90% of the total light energy is less than 20 μm. The optical lens given in Example 4 has high resolving power. Figure 4a

[0132] Table 7

[0133]

[0134] In Example 4, the first side S1 and the second side S2 of the first lens L1 are both aspherical surfaces, and the conic coefficients and the high-order term coefficients of the aspherical surfaces used in Example 4 are given in Table 8.

[0135] Table 8

[0136]

[0137] The MTF value of the optical lens of Example 4 at a spatial frequency of 17 lp / mm (17 lines per millimeter) exceeds 0.74. As shown in the spot diagram RMS, the root mean square radius of the spot on the image plane at the edge field is 14 μm; as shown in the encircled energy, the diameter of the circle on the image plane at the point where the spot energy accounts for 90% of the total light energy is less than 20 μm. The optical lens given in Example 4 has high resolving power.

[0138] Example 5

[0139] The optical lens according to Example 5 of the present application is described below with reference to Figure 5a As shown in the spot diagram RMS, the root mean square radius of the spot on the image plane at the edge field is 14 μm; as shown in the encircled energy, the diameter of the circle on the image plane at the point where the spot energy accounts for 90% of the total light energy is less than 20 μm. The optical lens given in Example 4 has high resolving power. Figure 5a ​​​As shown, the main difference between this embodiment and embodiment 1 is that the optical parameters of the radii of curvature of the surfaces of the lenses, the thickness of the lenses, etc. are different; the optical power of the second lens L2 is positive; the second side S6 of the third lens L3 is a concave surface; and the first side S1 of the first lens L1 and the second side S2 of the first lens L1 have at least one inflection point. Table 9 shows the basic parameter table of the optical lens of embodiment 5.

[0140] Table 9

[0141]

[0142] In embodiment 5, the first side S1 and the second side S2 of the first lens L1 are both aspherical surfaces, and table 10 shows the conic coefficients and high-order term coefficients of the aspherical surfaces used in embodiment 5.

[0143] Table 10

[0144]

[0145] The MTF value of the optical lens of embodiment 5 at a spatial frequency of 17 lp / mm (17 lines per millimeter) is more than 0.73. In terms of point spread function RMS, the root mean square radius of the spot on the image plane at the edge field is 14.5 pm; in terms of diffraction circle entrance energy, the circular diameter on the image plane at the proportion of 90% of the spot energy in the total light energy is less than 20 pm. The optical lens given in embodiment 5 has high resolving power.

[0146] Embodiment 6

[0147] The following refers to Figure 6a An optical lens according to embodiment 6 of the present application is described. As shown in Figure 6a As shown, the main difference between this embodiment and embodiment 1 is that the optical parameters of the radii of curvature of the surfaces of the lenses, the thickness of the lenses, etc. are different; the first side S1 of the first lens L1 and the second side S2 of the first lens L1 have at least one inflection point. Among them, the absolute value of the radius of curvature of the first side S5 of the third lens L3 is large, which is approximately a plane. Table 11 shows the basic parameter table of the optical lens of embodiment 6.

[0148] Table 11

[0149]

[0150] In embodiment 6, the first side S1 and the second side S2 of the first lens L1 are both aspherical surfaces, and table 12 shows the conic coefficients and high-order term coefficients of the aspherical surfaces used in embodiment 6.

[0151] Table 12

[0152]

[0153] The optical lens of Example 6 has an MTF value exceeding 0.69 at a spatial frequency of 17 lp / mm (17 lines / mm). In terms of the dot plot RMS, the root mean square radius of the light spot on the image plane is 20 μm at the edge field of view; and in terms of diffraction ingress energy, the diameter of the circle on the image plane is less than 20 μm at the point where the light spot energy accounts for 90% of the total light energy. The optical lens given in Example 6 exhibits high resolving power.

[0154] Example 7

[0155] The following is for reference Figure 7a Describes an optical lens according to Embodiment 7 of this application. For example... Figure 7a As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the optical power of the second lens L2 is positive; the first side surface S5 of the third lens L3 is concave; and the first side surface S1 and the second side surface S2 of the first lens L1 have at least one inflection point. Table 13 shows the basic parameters of the optical lens of Embodiment 7.

[0156] Table 13

[0157]

[0158] In Example 7, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces. Table 14 gives the conic coefficients and higher-order coefficients that can be used for each aspherical surface in Example 7.

[0159] Table 14

[0160]

[0161] For example, the optical lens of Example 7 has an MTF value exceeding 0.72 at a spatial frequency of 17 lp / mm (17 lines / mm). In terms of the dot plot RMS, the root mean square radius of the light spot on the image plane is 18 μm at the edge field of view; and in terms of diffraction ingress energy, the diameter of the circle on the image plane is less than 20 μm at the point where the light spot energy accounts for 90% of the total light energy. The optical lens given in Example 7 exhibits high resolving power.

[0162] Example 8

[0163] The following is for reference Figure 8a Describes an optical lens according to Embodiment 8 of this application. For example... Figure 8a As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the optical power of the first lens L1 is positive. Table 15 shows the basic parameters of the optical lens of Embodiment 8.

[0164] Table 15

[0165]

[0166] In Example 8, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces. Table 16 gives the conic coefficients and higher-order coefficients that can be used for each aspherical surface in Example 8.

[0167] Table 16

[0168]

[0169] The optical lens of Example 8 has an MTF value exceeding 0.73 at a spatial frequency of 17 lp / mm (17 lines / mm). In terms of the dot plot RMS, the root mean square radius of the light spot on the image plane is 12 μm at the edge field of view; and in terms of diffraction ingress energy, the diameter of the circle on the image plane is less than 20 μm at the point where the light spot energy accounts for 90% of the total light energy. The optical lens given in Example 8 exhibits high resolving power.

[0170] Example 9

[0171] The following is for reference Figure 9a Describes an optical lens according to Embodiment 9 of this application. For example... Figure 9a As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the optical power of the first lens L1 is positive; the optical power of the second lens L2 is positive. Among them, the absolute value of the radius of curvature of the first side surface S5 of the third lens L3 is relatively large, approximating a plane. Table 17 shows the basic parameters of the optical lens of Embodiment 9.

[0172] Table 17

[0173]

[0174] In Example 9, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces. Table 18 gives the conic coefficients and higher-order coefficients that can be used for each aspherical surface in Example 9.

[0175] Table 18

[0176]

[0177] The optical lens of Example 9 has an MTF value exceeding 0.73 at a spatial frequency of 17 lp / mm (17 lines / mm). In terms of the dot plot RMS, the root mean square radius of the light spot on the image plane is 13 μm at the edge field of view; and in terms of diffraction ingress energy, the diameter of the circle on the image plane is less than 20 μm at the point where the light spot energy accounts for 90% of the total light energy. The optical lens given in Example 9 exhibits high resolving power.

[0178] Example 10

[0179] The following is for reference Figure 10a Describes an optical lens according to Embodiment 10 of this application. For example... Figure 10a As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the optical power of the first lens L1 is positive. The radius of curvature of the first side surface S5 of the third lens L3 has a relatively large absolute value, approximating a plane. Table 19 shows the basic parameters of the optical lens of Embodiment 10.

[0180] Table 19

[0181]

[0182] In Example 10, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces. Table 20 gives the conic coefficients and higher-order coefficients that can be used for each aspherical surface in Example 10.

[0183] Table 20

[0184]

[0185] The optical lens of Example 10 has an MTF value exceeding 0.67 at a spatial frequency of 17 lp / mm (17 lines / mm). In terms of the dot plot RMS, the root mean square radius of the light spot on the image plane is 15 μm at the edge field of view; and in terms of diffraction ingress energy, the diameter of the circle on the image plane is less than 20 μm at the point where the light spot energy accounts for 90% of the total light energy. The optical lens given in Example 10 exhibits high resolving power.

[0186] Example 11

[0187] The following is for reference Figure 11a Describes an optical lens according to Embodiment 11 of this application. For example... Figure 11a As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the optical power of the first lens L1 is positive; and the first side surface S5 of the third lens L3 is concave. Table 21 shows the basic parameters of the optical lens of Embodiment 11.

[0188] Table 21

[0189]

[0190] In Example 11, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces. Table 22 gives the conic coefficients and higher-order coefficients that can be used for each aspherical surface in Example 11.

[0191] Table 22

[0192]

[0193] The optical lens of Example 11 has an MTF value exceeding 0.67 at a spatial frequency of 17 lp / mm (17 lines / mm). In terms of the dot plot RMS, the root mean square radius of the light spot on the image plane is 16 μm at the edge field of view; and in terms of diffraction ingress energy, the diameter of the circle on the image plane is less than 20 μm at the point where the light spot energy accounts for 90% of the total light energy. The optical lens given in Example 11 exhibits high resolving power.

[0194] Example 12

[0195] The following is for reference Figure 12a Describes an optical lens according to Embodiment 12 of this application. For example... Figure 12a As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the optical power of the second lens L2 is positive; the first side surface S1 and the second side surface S2 of the first lens L1 have at least one inflection point. The second side surface S6 of the third lens L3 has a relatively large absolute value of its radius of curvature, approximating a plane. Table 23 shows the basic parameters of the optical lens of Embodiment 12.

[0196] Table 23

[0197]

[0198] In Example 12, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces. Table 24 gives the conic coefficients and higher-order coefficients that can be used for each aspherical surface in Example 12.

[0199] Table 24

[0200]

[0201] The optical lens of Example 12 has an MTF value exceeding 0.7 at a spatial frequency of 17 lp / mm (17 lines / mm). In terms of the dot plot RMS, the root mean square radius of the light spot on the image plane is 12 μm at the edge field of view; and in terms of diffraction ingress energy, the diameter of the circle on the image plane is less than 20 μm at the point where the light spot energy accounts for 90% of the total light energy. The optical lens given in Example 12 exhibits high resolving power.

[0202] Example 13

[0203] The following is for reference Figure 13a Describes an optical lens according to Embodiment 13 of this application. For example... Figure 13a As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different. Table 25 shows the basic parameters of the optical lens of Embodiment 13.

[0204] Table 25

[0205]

[0206] In Example 13, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces. Table 26 gives the conic coefficients and higher-order coefficients that can be used for each aspherical surface in Example 13.

[0207] Table 26

[0208]

[0209] In Example 13, F1 / F = -202.304, indicating that the value of F1 / F tends towards negative infinity. For example, the optical lens of Example 13 has an MTF value exceeding 0.74 at a spatial frequency of 17 lp / mm (17 lines / mm). Regarding the dot plot RMS, at the edge field of view, the root mean square radius of the light spot on the image plane is 12.5 μm; regarding the diffraction ingress energy, at the point where the light spot energy accounts for 90% of the total light energy, the diameter of the circle on the image plane is less than 20 μm. The optical lens given in Example 13 has high resolving power.

[0210] Example 14

[0211] The following is for reference Figure 14a Describes an optical lens according to Embodiment 14 of this application. For example... Figure 14a As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the optical power of the first lens L1 is positive; and the optical power of the second lens L2 is positive. Table 27 shows the basic parameters of the optical lens of Embodiment 14.

[0212] Table 27

[0213]

[0214] In Example 14, the first side surface S1 and the second side surface S2 of the first lens L1 are both aspherical surfaces, and the conic coefficients and the higher order coefficients of the aspherical surfaces used in Example 14 are given in Table 28.

[0215] Table 28

[0216]

[0217] The MTF value of the optical lens of Example 14 exceeds 0.72 at a spatial frequency of 17 lp / mm (17 lines per millimeter). In terms of spot diagram RMS, the root mean square radius of the spot on the image plane is 12.5 pm at the edge field; in terms of diffraction circle entrance energy, the circle diameter on the image plane is less than 20 pm at the proportion of 90% of the spot energy in the total light energy. The optical lens given in Example 14 has high resolving power.

[0218] Tables 29-1 and 29-2 give the basic parameters of the optical lenses in Examples 1-14, such as F, TTL, FOV, and ENPD. The unit of the parameter FOV in the table is °, the unit of the parameter is rad, and the units of the other parameters are mm.

[0219] Table 29-1

[0220]

[0221] Table 29-2

[0222]

[0223] In summary, the conditional expressions of each of Examples 1-14 satisfy the relationships shown in Tables 30-1 and 30-2. Among them, the units of D / H / F and R2 / R3 / F1 are mm, and the unit of FOV / F is ° / mm. -1

[0224] Table 30-1

[0225]

[0226] Table 30-2

[0227]

[0228] ​The application also provides an electronic device comprising the optical lens in the above exemplary embodiments and an imaging element for converting an optical image formed by the optical lens into an electrical signal, the imaging element being arranged on the second side of the optical lens, for example on an imaging surface, which can be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS), for example. Light from the first side is imaged on the second side after passing through the optical lens. The application also provides an electronic device comprising the optical lens in the above exemplary embodiments and a light source, the light source being located on the second side of the optical lens. Light emitted by the light source is projected onto 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 application also provides an electronic device comprising a first device and a second device, the first device being a laser radar emitting device, for example, and the second device being a laser radar receiving device, for example. The first device can comprise the optical lens in the above exemplary embodiments and a light source, the light source being located on the second side of the optical lens, light emitted by the light source being projected onto the first side of the optical lens after passing through the optical lens, and forming an image or illuminating an area on the first side. The second device can comprise the optical lens in the above exemplary embodiments and an imaging element for converting an optical image formed by the optical lens into an electrical signal, the imaging element being arranged on the second side of the optical lens (for example on an imaging surface), which can be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS), light from the first side being imaged on the second side after passing through the optical lens.

[0229] The above description is merely exemplary embodiments of the application and a description of the technical principles of the application. It should be understood by those skilled in the art that the scope of the application disclosed in the application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by the combinations of the above technical features or equivalent features without departing from the inventive concept. For example, the above technical features can be replaced with other technical features disclosed in the application (but not limited to) having similar functions to form technical solutions.

Claims

1. An optical lens, characterized in that, Along the optical axis, from the first side to the second side, the following are included in sequence: A first lens having optical power, wherein the first side surface of the first lens is convex and the second side surface of the first lens is concave; A second lens with optical power, wherein the first side surface of the second lens is concave and the second side surface of the second lens is convex; A third lens with positive optical power; A fourth lens with positive optical power, wherein the first side surface of the fourth lens is convex and the second side surface of the fourth lens is concave; The optical lens has four lenses with optical power. The optical lens meets the following requirement: -0.0152mm -1 ≤R2 / R3 / F1≤0.0452mm -1 And 0.5642≤(1 / F3+1 / F4)×F≤0.9315; R2 is the center radius of curvature of the second side of the first lens, R3 is the center radius of curvature of the first side of the second lens, F1 is the focal length of the first lens, F3 is the focal length of the third lens, and F4 is the focal length of the fourth lens.

2. The optical lens according to claim 1, characterized in that, The optical power of the first lens is positive; or, The optical power of the first lens is negative; or... The optical power of the second lens is positive; or, The second lens has a negative optical power; or, The first side surface of the third lens is convex, and the second side surface of the third lens is convex; or... The first side surface of the third lens is convex, and the second side surface of the third lens is concave; or... The first side surface of the third lens is convex, and the second side surface of the third lens is planar; or... The first side surface of the third lens is concave, and the second side surface of the third lens is convex; or... The first side surface of the third lens is a plane, and the second side surface of the third lens is a convex surface.

3. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 0.85≤F / ENPD≤1.15, 0.069≤TTL / H / FOV×1°≤0.1385, 0.475≤(F×θ) / D≤0.7689, 0.12≤BFL / TTL≤0.3012, 0.0263≤D / H / FOV×1°≤0.0513, 0.177mm -1 ≤D / H / F≤0.2872mm -1 2.6149≤TTL / F≤4.2671, 1.005≤F / H≤1.705, 3.9693° / mm≤FOV / F≤9.0403° / mm, 0.3108≤D / TTL≤0.4968, 0.091≤T_DIR / TTL≤0.2047 and 0.6813≤D / D8≤1.6129; F is the focal length of the optical lens, ENPD is the entrance pupil diameter of the optical lens, TTL is the total optical length of the optical lens, 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, θ is the radian value corresponding to the maximum field of view of the optical lens, BFL is the optical back focal length of the optical lens, T12 is the center distance between the second side surface of the first lens and the first side surface of the second lens, T23 is the center distance between the second side surface of the second lens and the first side surface of the third lens, T34 is the center distance between the second side surface of the third lens and the first side surface of the fourth lens, T_DIR is the sum of T12, T23 and T34, D is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the first lens, and D8 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the fourth lens.

4. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 18.7791≤F1 / F≤32.1480, 1<D / D2≤1.6554, 0.7858≤R1 / R2≤2.6164 and 0.6839≤CT1 / (CT1+SAG2-SAG1)≤1.4393; F is the focal length of the optical lens, F1 is the focal length of the first lens, D is the aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, D2 is the aperture of the second side of the first lens corresponding to the maximum field of view of the optical lens, R1 is the central radius of curvature of the first side of the first lens, R2 is the central radius of curvature of the second side of the first lens, CT1 is the central thickness of the first lens, SAG1 is the sagitta of the first side of the first lens, and SAG2 is the sagitta of the second side of the first lens.

5. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 5.5569≤F2 / F≤20.5890, 0.6132≤R3 / R4≤1.07 and 0.9921≤CT2 / (CT2+SAG4-SAG3)≤1.6132; F is the focal length of the optical lens, F2 is the focal length of the second lens, R3 is the central radius of curvature of the first side of the second lens, R4 is the central radius of curvature of the second side of the second lens, CT2 is the central thickness of the second lens, SAG3 is the sagitta of the first side of the second lens, and SAG4 is the sagitta of the second side of the second lens.

6. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 2.1461≤F4 / F≤8.0349, 0.3385≤SAG7 / (D7 / 2)≤0.6385, 0.1737≤SAG8 / (D8 / 2)≤0.3808, 0.1658≤(R8-CT4) / R7≤1.1259, 2.8959≤F4 / BFL≤16.4713, 1.2155≤CT4 / (CT4+SAG8-SAG7)≤2.3941, 0.7429≤R8 / F≤2.2477 and 1.5229≤R8 / BFL≤2.7754; F is the focal length of the optical lens, F4 is the focal length of the fourth lens, SAG7 is the first side profile elevation of the fourth lens, SAG8 is the second side profile elevation of the fourth lens, D7 is the aperture corresponding to the maximum field of view of the optical lens on the first side profile of the fourth lens, D8 is the aperture corresponding to the maximum field of view of the optical lens on the second side profile of the fourth lens, R7 is the center radius of curvature of the first side profile of the fourth lens, R8 is the center radius of curvature of the second side profile of the fourth lens, CT4 is the center thickness of the fourth lens, and BFL is the optical back focal length of the optical lens.

7. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 0.0838≤T12 / TTL≤0.1949, 1<D2 / D3≤1.2831, -3.8221≤R1 / R4≤-0.5964 and -0.1034≤(1 / F1+1 / F2)×F≤0.1383; T12 is the center distance between the second side surface of the first lens and the first side surface of the second lens; TTL is the total optical length of the optical lens; D2 is the aperture corresponding to the maximum field of view of the optical lens on the second side surface of the first lens; D3 is the aperture corresponding to the maximum field of view of the optical lens on the first side surface of the second lens; R1 is the central radius of curvature of the first side surface of the first lens; R4 is the central radius of curvature of the second side surface of the second lens; F is the focal length of the optical lens; F1 is the focal length of the first lens; and F2 is the focal length of the second lens.

8. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 1.5356≤F3 / F≤3.1688, 0.2247≤F3 / F4≤1.2551, 0.4799≤CT3 / CT4≤1.3088, 0.9638≤F34 / F≤1.6758 and 5.2488≤(F3+F4) / BFL≤20.8271; F is the focal length of the optical lens, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F34 is the combined focal length of the third and fourth lenses, CT3 is the center thickness of the third lens, CT4 is the center thickness of the fourth lens, and BFL is the optical back focal length of the optical lens.

9. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 0.5878≤(1 / F2+1 / F3+1 / F4)×F≤0.9397, -0.1392≤(1 / F1+1 / F2) / (1 / F3+1 / F4)≤0.2041 and 10.2462≤T12 / (T23+T34)≤23.2386; F is the focal length of the optical lens, 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, T12 is the center distance between the second side surface of the first lens and the first side surface of the second lens, T23 is the center distance between the second side surface of the second lens and the first side surface of the third lens, and T34 is the center distance between the second side surface of the third lens and the first side surface of the fourth lens.

10. The optical lens according to claim 1 or 2, characterized in that, The optical lens also includes an aperture stop, and the optical lens satisfies: 0.1343≤L_stop / TTL≤0.2415; L_stop is the distance between the first side surface of the first lens and the aperture stop, and TTL is the total optical length of the optical lens.

11. The optical lens according to claim 1 or 2, characterized in that, The optical lens also includes an aperture stop, and the optical lens satisfies: 0.046≤ST-fobj / F / FOV×1°≤0.0785; ST-fobj is the distance between the aperture stop and the image plane, F is the focal length of the optical lens, and FOV is the maximum field of view of the optical lens.

12. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies: -2.681≤R2 / R3≤-0.6156; R2 is the center radius of curvature of the second side surface of the first lens, and R3 is the center radius of curvature of the first side surface of the second lens.

13. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies: 0.5113≤D / Dmax(D3~D8)≤0.9054; D is the aperture diameter on the first side of the first lens corresponding to the maximum field of view of the optical lens; D3 is the aperture diameter on the first side of the second lens corresponding to the maximum field of view of the optical lens; D4 is the aperture diameter on the second side of the second lens corresponding to the maximum field of view of the optical lens; D5 is the aperture diameter on the first side of the third lens corresponding to the maximum field of view of the optical lens; D6 is the aperture diameter on the second side of the third lens corresponding to the maximum field of view of the optical lens; D7 is the aperture diameter on the first side of the fourth lens corresponding to the maximum field of view of the optical lens; D8 is the aperture diameter on the second side of the fourth lens corresponding to the maximum field of view of the optical lens; and Dmax(D3~D8) is the maximum value among D3, D4, D5, D6, D7, and D8.

14. The optical lens according to claim 13, characterized in that, The optical lens satisfies: Dmax(D5, D6, D7) > Dmax(D3, D4, D8). Dmax(D5, D6, D7) is the maximum value among D5, D6, and D7, and Dmax(D3, D4, D8) is the maximum value among D3, D4, and D8.

15. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies: 0.006≤(T23+T34) / TTL≤0.0101; T23 is the center distance between the second side surface of the second lens and the first side surface of the third lens, T34 is the center distance between the second side surface of the third lens and the first side surface of the fourth lens, and TTL is the total optical length of the optical lens.

16. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: Dmin(D5, D6, D7) > Dmax(D3, D4, D8), 0.081 ≤ TTL / H / FOV×1° ≤ 0.12, 0.559 ≤ (F×θ) / D ≤ 0.669, 0.031 ≤ D / H / FOV×1° ≤ 0.045, 0.208mm -1 ≤D / H / F≤0.25mm -1 , 0.264≤F3 / F4≤1.091, 1.806≤F3 / F≤2.756, 2.525≤F4 / F≤6.987, 0.565≤CT3 / CT4≤1 .138, 0.107≤T_DIR / TTL≤0.178, 0.158≤L_stop / TTL≤0.21, 1.134≤F34 / F≤1.457, 3. 076≤TTL / F≤3.71, 0.054≤ST-fobj / F / FOV×1°≤0.068, -2.331≤R2 / R3≤-0.724, 0.398 ≤SAG7 / (D7 / 2)≤0.555, 0.204≤SAG8 / (D8 / 2)≤0.331, 0.195≤(R8-CT4) / R7≤0.979, 1. 182≤F / H≤1.483, -202.304≤F1 / F≤-6.076, 0.664≤(1 / F3+1 / F4)×F≤0.81, -0.121≤( 1 / F1+1 / F2) / (1 / F3+1 / F4)≤0.177, 0.099≤T12 / TTL≤0.169, 0.007≤(T23+T34) / TTL≤ 0.009, 12.079≤T12 / (T23+T34)≤20.205, 4.67° / mm≤FOV / F≤7.861° / mm, -170.367≤F 2 / F≤-14.513, 0.692≤(1 / F2+1 / F3+1 / F4)×F≤0.817, 0.366≤D / TTL≤0.432, -0.013mm -1 ≤R2 / R3 / F1≤0.039mm -1 , 0.601 ≤ D / Dmax (D3~D8) ≤ 0.787, 0.802 ≤ D / D8 ≤ 1.402, 1.117 ≤ D / D2 ≤ 1.44, 1.019 ≤ D2 / D3 ≤ 1.116, 0.924 ≤ R1 / R2 ≤ 2.275, 0.721 ≤ R3 / R4 ≤ 0.93, -3.324 ≤ R1 / R4 ≤ -0.702, 0.141 ≤ BFL / TTL ≤ 0.262, 6.175 ≤ (F3 + F4) / BFL ≤ 18.112, 3.407 ≤ F4 / BFL ≤ 14.324, 0.805 ≤ CT1 / (CT1 + SAG2 - SAG1) ≤ 1.252, 1.167 ≤ CT2 / (CT2 + SAG4 - SAG3) ≤ 1.403, 1.43 ≤ CT4 / (CT4 + SAG8 - SAG7) ≤ 2.082, -0.09 ≤ (1 / F1 + 1 / F2)×F ≤ 0.12, 0.874 ≤ R8 / F ≤ 1.955 and 1.792 ≤ R8 / BFL ≤ 2.413; F is the focal length of the optical lens, 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 F34 is the combined focal length of the third lens and the fourth lens. CT1 is the center thickness of the first lens, T12 is the center distance between the second side surface of the first lens and the first side surface of the second lens, CT2 is the center thickness of the second lens, T23 is the center distance between the second side surface of the second lens and the first side surface of the third lens, CT3 is the center thickness of the third lens, T34 is the center distance between the second side surface of the third lens and the first side surface of the fourth lens, CT4 is the center thickness of the fourth lens, T_DIR is the sum of T12, T23 and T34, L_stop is the distance between the first side surface of the first lens and the aperture stop, and ST-fobj is the distance between the aperture stop and the image plane; R1 is the center radius of curvature of the first side surface of the first lens, R2 is the center radius of curvature of the second side surface of the first lens, R3 is the center radius of curvature of the first side surface of the second lens, R4 is the center radius of curvature of the second side surface of the second lens, R7 is the center radius of curvature of the first side surface of the fourth lens, and R8 is the center radius of curvature of the second side surface of the fourth lens. SAG1 is the first side profile height of the first lens, SAG2 is the second side profile height of the first lens, SAG3 is the first side profile height of the second lens, SAG4 is the second side profile height of the second lens, SAG7 is the first side profile height of the fourth lens, and SAG8 is the second side profile height of the fourth lens. D is the aperture diameter on the first side of the first lens corresponding to the maximum field of view of the optical lens; D2 is the aperture diameter on the second side of the first lens corresponding to the maximum field of view of the optical lens; D3 is the aperture diameter on the first side of the second lens corresponding to the maximum field of view of the optical lens; D4 is the aperture diameter on the second side of the second lens corresponding to the maximum field of view of the optical lens; D5 is the aperture diameter on the first side of the third lens corresponding to the maximum field of view of the optical lens; and D6 is the aperture diameter on the third lens. The aperture corresponding to the maximum field of view of the optical lens on the second side, D7 is the aperture corresponding to the maximum field of view of the optical lens on the first side of the fourth lens, D8 is the aperture corresponding to the maximum field of view of the optical lens on the second side of the fourth lens, Dmax(D3~D8) is the maximum value among D3, D4, D5, D6, D7 and D8, Dmin(D5, D6, D7) is the minimum value among D5, D6 and D7, and Dmax(D3, D4, D8) is the maximum value among D3, D4 and D8. TTL is the total optical length of the optical lens, 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, FOV is the maximum field of view of the optical lens, θ is the radian value corresponding to the maximum field of view of the optical lens, and BFL is the optical back focal length of the optical lens.

17. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies: 0.6813≤D / D8≤1.5; D is the aperture diameter on the first side of the first lens corresponding to the maximum field of view of the optical lens, and D8 is the aperture diameter on the second side of the fourth lens corresponding to the maximum field of view of the optical lens.

18. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following condition: F1 / F≤-5.1644; where F is the focal length of the optical lens and F1 is the focal length of the first lens.

19. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following condition: F2 / F ≤ -12.3364; where F is the focal length of the optical lens and F2 is the focal length of the second lens.

20. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 22.094≤F1 / F≤27.956 and 6.537≤F2 / F≤17.902; where F is the focal length of the optical lens, F1 is the focal length of the first lens, and F2 is the focal length of the second lens.

21. An electronic device, characterized in that, include: Optical lens according to any one of claims 1 to 20; as well as At least one of an imaging element and a light source; The imaging element is used to convert the optical image or optical information formed by the optical lens into an electrical signal; The light source is located on the second side of the optical lens. The light emitted by the light source is projected onto the first side of the optical lens after passing through the optical lens, and forms an image or illuminated area on the first side of the optical lens.

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