Optical lens and electronic device

Abstract

The application discloses an optical lens and an electronic device. The optical lens comprises first to sixth lenses in sequence from a first side to a second side along an optical axis. The first lens has a negative focal power, the first side of the first lens is a convex surface, the second side of the first lens is a concave surface, the second lens has a positive focal power, the third lens has a negative focal power, the first side of the third lens is a concave surface, the second side of the third lens is a convex surface, and the fourth to sixth lenses all have positive focal powers. The optical lens satisfies the conditions of -0.25<=R5 / F2<=-0.07 and 0.31<=(1 / F4+1 / F5) / T34<=1.35.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens and electronic device. Background Technology

[0002] In automotive autonomous driving assistance systems, LiDAR lenses are key components for detecting information about the vehicle's surroundings. With the rapid development of autonomous driving assistance systems, LiDAR lenses are trending towards miniaturization and smaller FNO (Front-Noise Detection) sensors.

[0003] Due to the high safety requirements of automotive driver assistance systems, smaller FNO lenses are typically used to increase light intake and the number of lens elements is increased to improve image quality for more accurate signal detection. However, these lenses tend to be larger and more expensive, hindering miniaturization and cost reduction. Summary of the Invention

[0004] The first aspect of this application provides an optical lens comprising, sequentially from a first side to a second side along an optical axis: a first lens having negative optical power, wherein a first side surface of the first lens is convex and a second side surface of the first lens is concave; a second lens having positive optical power; a third lens having negative optical power, wherein a first side surface of the third lens is concave and a second side surface of the third lens is convex; a fourth lens having positive optical power; a fifth lens having positive optical power; and a sixth lens having positive optical power; wherein the number of lenses having optical power in the optical lens is six; and wherein the optical lens satisfies: -0.25≤R5 / F2≤-0.07 and 0.31≤(1 / F4+1 / F5) / T34≤1.35; wherein R5 is the radius of curvature of the first side surface of the third lens, F2 is the effective focal length of the second lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, and T34 is the gap between the third lens and the fourth lens.

[0005] According to an exemplary embodiment of this application, the first side surface and the second side surface of the second lens are convex and convex respectively, or the first side surface and the second side surface of the second lens are convex and concave respectively, or the first side surface and the second side surface of the second lens are concave and convex respectively; the first side surface and the second side surface of the fourth lens are convex and convex respectively, or the first side surface and the second side surface of the fourth lens are convex and concave respectively, or the first side surface and the second side surface of the fourth lens are concave and convex respectively; the first side surface and the second side surface of the fifth lens are convex and convex respectively, or the first side surface and the second side surface of the fifth lens are convex and concave respectively, or the first side surface and the second side surface of the fifth lens are concave and convex respectively.

[0006] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 5.34≤TTL / F≤9.17, 0.13≤BFL / TTL≤0.26; where TTL is the total optical length of the optical lens and F is the total effective focal length of the optical lens.

[0007] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 0≤(H / 2) / (F×tan(θ / 2))≤0.58, -1.15≤(H / 2-F×tan(θ / 2)) / (F×tan(θ / 2))≤-0.42; where H is the image height corresponding to the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, and θ is the radian value of the maximum field of view of the optical lens.

[0008] According to an exemplary embodiment of this application, the optical lens satisfies: -2.26≤F1 / F≤-1.23, where F1 is the effective focal length of the first lens and F is the total effective focal length of the optical lens.

[0009] According to an exemplary embodiment of this application, the optical lens satisfies: 6.33≤F2 / F≤20.64, where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens.

[0010] According to an exemplary embodiment of this application, the optical lens satisfies: -29.66≤F3 / F≤-9.47, where F3 is the effective focal length of the third lens and F is the total effective focal length of the optical lens.

[0011] According to an exemplary embodiment of this application, the optical lens satisfies: 2.98≤F4 / F≤7.3, where F4 is the effective focal length of the fourth lens and F is the total effective focal length of the optical lens.

[0012] According to an exemplary embodiment of this application, the optical lens satisfies: 2.91≤F5 / F≤9.68, where F5 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens.

[0013] According to an exemplary embodiment of this application, the optical lens satisfies: 2.84≤F6 / F≤5.15, where F6 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens.

[0014] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 0.85≤F / ENPD≤1.61, 1.25≤R1 / TTL≤4.3, 0.14≤R2 / TTL≤0.23, -0.26≤R5 / TTL≤-0.16, -0.36≤R6 / TTL≤-0.23; where F is the total effective 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, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, R5 is the radius of curvature of the first side surface of the third lens, and R6 is the radius of curvature of the second side surface of the third lens.

[0015] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 8.56≤R1 / F≤28.91, 0.91≤R5 / (CT3+R6)≤1.55; where R1 is the radius of curvature of the first side of the first lens, F is the total effective focal length of the optical lens, R5 is the radius of curvature of the first side of the third lens of the optical lens, R6 is the radius of curvature of the second side of the third lens of the optical lens, and CT3 is the center thickness of the third lens of the optical lens.

[0016] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: -62.9≤(F2+F3) / T23≤6.52, 10.2≤(F4+F5+F6) / F≤17.7, 0.68≤|F3| / |F2|≤3.78, where F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, T23 is the axial distance between the second side surface of the second lens and the first side surface of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, and F is the total effective focal length of the optical lens.

[0017] According to an exemplary embodiment of this application, the optical lens satisfies: |F2|<|F3|; where F2 is the effective focal length of the second lens and F3 is the effective focal length of the third lens.

[0018] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 0≤T34 / F4≤0.02, 0.03≤T34 / CT4≤0.19, 9.22≤CT3 / T34≤41.35, 0.28≤CT2 / CT3≤0.66; where T34 is the axial distance between the second side surface of the third lens and the first side surface of the fourth lens, F4 is the effective focal length of the fourth lens, CT2 is the center thickness of the second lens of the optical lens, CT3 is the center thickness of the third lens of the optical lens, and CT4 is the center thickness of the fourth lens of the optical lens.

[0019] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 0.28≤(R4+R5) / (R4-R5)≤2.29, -2.38≤R5 / CT3≤-1.33; where R4 is the radius of curvature of the second side surface of the second lens, R5 is the radius of curvature of the first side surface of the third lens, and CT3 is the center thickness of the third lens.

[0020] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 1≤F / ENPD≤1.4, 6.28≤TTL / F≤8, 0.1559≤BFL / TTL≤0.23, -1.97≤F1 / F≤-1.44, 7.45≤F2 / F≤18, -25.8≤F3 / F≤-11, 3.5≤F4 / F≤6.36, 3.42 ≤F5 / F≤8.42, 3.33≤F6 / F≤4.49, 1.47≤R1 / TTL≤3.74, 0.16≤R2 / TTL≤0.199, -0.23≤R5 / TT L≤-0.19, -0.32≤R6 / TTL≤-0.26, -1≤(H / 2-F×tan(θ / 2)) / (F×tan(θ / 2))≤-0.49, 1.07≤R5 / (CT3+R6)≤1.35, 0.004≤(H / 2) / (F×tan(θ / 2))≤0.503, 12≤(F4+F5+F6) / F≤15.4, 10≤R1 / F≤25.14, -55≤(F2+F3) / T23≤5.68, 0.8≤|F3| / |F2|≤3.29, 0.33≤(R4+R5) / (R4-R5)≤1.9 92. -2.067≤R5 / CT3≤-1.56, -0.22≤R5 / F2≤-0.087, 0.0043≤T34 / F4≤0.02, 0.036≤T34 / C T4≤0.163, 10.84≤CT3 / T34≤35.96, 0.32≤CT2 / CT3≤0.58, 0.36≤(1 / F4+1 / F5) / T34≤1.18;

[0021] Wherein, F is the total effective 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, BFL is the optical back focal length of the optical lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, R5 is the radius of curvature of the first side surface of the third lens, R6 is the radius of curvature of the second side surface of the third lens, H is the image height corresponding to the maximum field of view of the optical lens, θ is the radian value of the maximum field of view of the optical lens, T23 is the axial distance between the second side surface of the second lens and the first side surface of the third lens, T34 is the axial 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, CT3 is the center thickness of the third lens, and CT2 is the center thickness of the second lens.

[0022] The second aspect of this application provides an electronic device comprising an optical lens as described in the exemplary embodiments above, and at least one of an imaging element and a light source, wherein the imaging element is used to convert an optical image or optical information formed by the optical lens into an electrical signal, the light source is located on a second side of the optical lens, and the light emitted by the light source is projected onto a first side of the optical lens after passing through the optical lens, forming an image or an illuminated area on the first side of the optical lens.

[0023] The optical lens according to the embodiments of this application employs six lenses with optical power, wherein:

[0024] The first lens has a negative optical power attribute, which diverges light rays, separating the central and peripheral rays from each field of view. At the same field of view, the light emitted from the second side of the first lens provides a larger light-receiving surface for the rear optical system, increasing the aperture and light intake, thus improving image illumination. The convex design of the first side, combined with the concave design of the second side, allows the light emitted from the first lens to enter the rear smoothly, reducing light sensitivity. Furthermore, the convex design of the first side of the first lens facilitates the sliding of water droplets in practical applications, minimizing their impact on image formation.

[0025] The second lens has positive optical power and converges light rays. Light rays exiting the second lens enter the third lens. The first side of the third lens is concave, which helps to smoothly receive the light rays exiting the first lens. By controlling the ratio of the radius of curvature of the first side of the third lens to the focal length of the second lens (i.e., -0.25 ≤ R5 / F2 ≤ -0.07), the pincushion distortion produced by the third lens exactly cancels out the barrel distortion produced by the first lens, thus reducing distortion.

[0026] The third lens has negative optical power and diverges light. Its first side is concave, its second side is convex, and its overall shape is meniscus, which allows light to converge appropriately, helping to reduce the rear aperture. In the entire system, the third lens acts as a connector between the front and rear optical systems, deflecting light entering from the front optical system at a smaller angle. This better corrects aberrations while maintaining low system sensitivity and improving resolution.

[0027] The light rays exiting the third lens sequentially enter the fourth, fifth, and sixth lenses. The optical power of the fourth, fifth, and sixth lenses is positive, which has a converging effect on the light rays. Furthermore, by limiting 0.31≤(1 / F4+1 / F5) / T34≤1.35, the combined converging ability of the fourth and fifth positive lenses can be precisely matched with the spacing between the third and fourth lenses, ensuring a smooth transition of the strong diverging optical path generated by the first two negative lenses and preventing disorder in the optical path transmission. At the same time, the optical path transmission of the entire optical system is always in a balanced state, effectively suppressing the loss of control of key aberrations such as astigmatism, field curvature, and spherical aberration. Attached Figure Description

[0028] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0029] Figures 1 to 14 Schematic diagrams of the optical lenses according to Embodiments 1 to 14 of this application are shown respectively;

[0030] Figure 15 and Figure 16 The curves shown are the modulation transfer function (MTF) curves of the optical lenses in Embodiments 2 and 3 of this application, respectively. The MTF curves represent the lens imaging modulation at different spatial frequencies in each field of view. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the OTF coefficient. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] It should also be understood that the terms "comprising," "including," and / or "having," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0036] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] The features, principles and other aspects of this application are described in detail below.

[0039] An optical lens according to an exemplary embodiment of this application may include, for example, six lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are arranged sequentially from the first side to the second side along the optical axis.

[0040] In an exemplary embodiment, the optical lens provided in this application can be used as a light receiving lens or a light emitting lens, wherein: 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 clouds, etc.; the light emitting lens is generally used to transmit light from the light emitting unit to the object-side space, and 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 information, etc., according to the function of the light.

[0041] It is understood that when the optical lens provided in this application is used as a light-receiving lens such as a camera lens, a lidar receiver lens, a microscope lens, or a telescope lens, the term "first side" as used herein may refer to the object side, and "second side" may refer to the image side (such as the side where a photoelectric sensor or retina is located). That is, light from the object side can, for example, form an image on the image side. A camera lens may be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc. When the optical lens provided in this application is used as a light-emitting lens such as a projection lens or a lidar transmitter lens, the term "first side" as used herein may refer to the object side, and "second side" may refer to the light source side.

[0042] In some possible implementations, the optical lens provided in this application can also simultaneously perform both light receiving and light transmitting functions. For example, the optical lens provided in this application is used in a lidar system with shared light and light paths, where the optical lens simultaneously performs the functions of emitting laser light and receiving radar echo beams. As another example, the optical lens provided in this application is used in a system integrating optical communication and radar, where the optical lens simultaneously performs the functions of emitting modulated optical signals and receiving radar echo beams.

[0043] In an exemplary embodiment, the first lens has negative optical power, and its first side surface can be, for example, convex, and its second side surface can be, for example, concave. The negative optical power of the first lens has the function of diverging light, which can disperse the central and peripheral light rays of each field of view. At the same field of view, the light emitted through the second side surface of the first lens allows the rear optical system to have a larger light-receiving surface, thus enlarging the physical aperture of the aperture stop and achieving a greater amount of light intake, which is beneficial for increasing image illumination. The convex design of the first side surface, in conjunction with the concave design of the second side surface, allows the light emitted through the first lens to be incident smoothly to the rear, which helps to reduce light sensitivity. Furthermore, the convex design of the first side surface of the first lens also facilitates the sliding of water droplets in practical applications, reducing their impact on imaging.

[0044] In an exemplary embodiment, the second lens has positive optical power to achieve light convergence. Its first and second sides can be combined in three ways to meet the design requirements of the optical system: when using a convex-concave surface, the convex surface of the first side maximizes the collection of incident light, and the concave surface of the second side smoothly guides the light into the rear optical system, helping to achieve the goal of low system sensitivity and small front-end aperture; when using a double-convex surface, the double-convex structure is conducive to efficient light collection and can also promote the rapid transition of light to the subsequent optical structure, effectively reducing the system aperture; when using a concave-convex surface (crescent-shaped), the concave surface of the first side receives the diverging light from the first lens and achieves moderate diffusion, reducing the light deflection amplitude, and the convex surface of the second side directs and converges the light to the third lens, reducing the system light sensitivity through the light transition effect.

[0045] In an exemplary embodiment, the third lens has a negative optical power and functions to diverge light. Its first side is concave, receiving light from the second lens and facilitating further divergence. Its second side is convex and crescent-shaped, allowing light to converge appropriately and reducing the rear aperture. The third lens acts as a receiver between the front and rear optical systems, deflecting light from the front optical system at a smaller angle. This better corrects aberrations while maintaining low system sensitivity and improving resolution.

[0046] In an exemplary embodiment, the fourth lens has positive optical power to achieve light-gathering function. Its first and second sides can be combined in three ways to meet the requirements of the optical system: when using a convex-concave shape (crescent-shaped), the combination of the convex and concave surfaces facilitates appropriate light diffusion and can effectively converge the light collected by the large aperture at the front end, which helps to reduce light sensitivity; when using a biconvex shape, it can efficiently receive the diverging light from the third lens and quickly converge it, which helps to improve the system resolution while reducing light sensitivity; when using a concave-convex shape (crescent-shaped), the concave surface of the first side can further diffuse the diverging light from the third lens to a suitable extent, and the convex surface of the second side receives the light and converges it, which can also achieve the converging effect of the light collected by the large aperture at the front end, helping to reduce the system's light sensitivity.

[0047] In an exemplary embodiment, the fifth lens has positive optical power to achieve light-gathering function. Its first and second sides can be combined in three ways to meet the design requirements of the optical system: When using a convex-concave shape (crescent-shaped), the convex surface of the first side further receives and converges the light from the front end, while the concave surface of the second side facilitates appropriate light diffusion. This reduces light sensitivity, improves system resolution, and effectively reduces the rear port diameter and the overall system length, contributing to lens miniaturization. When using a concave-convex shape (crescent-shaped), the concave surface of the first side appropriately diffuses the converged light from the fourth lens, while the convex surface of the second side receives and converges the light. This achieves the converging effect of collecting light from a large front-end aperture, reduces light sensitivity, improves resolution, and reduces the rear port diameter and the overall system length, meeting miniaturization requirements. When using a biconvex shape, the biconvex structure can further converge the light from the fourth lens, effectively reducing light sensitivity and improving system resolution.

[0048] In an exemplary embodiment, the sixth lens has positive optical power to achieve light convergence. Its first and second sides can be combined in three ways to meet the design requirements of the optical system: When using a convex-concave shape (crescent-shaped), the convex surface of the first side further receives and converges the light from the front end, while the concave surface of the second side facilitates appropriate light diffusion. This reduces light sensitivity, improves system resolution, and effectively reduces the rear port diameter and overall system length, contributing to lens miniaturization. When using a concave-convex shape (crescent-shaped), the concave surface of the first side appropriately diffuses the converged light from the fifth lens to reduce light sensitivity, while the convex surface of the second side receives and converges the light. This achieves the converging effect of collecting light from a large front-end aperture and reduces the rear port diameter and overall system length, meeting miniaturization requirements. When using a biconvex shape, the biconvex structure can further converge the light from the fifth lens, effectively reducing light sensitivity and improving system resolution.

[0049] In an exemplary embodiment, the optical lens may further include an aperture stop, which may be disposed, for example, between the third lens and the fourth lens. By placing an aperture stop between the third and fourth lenses, it is beneficial for light to transition smoothly to the rear of the system, reducing the aperture of the rear lens and decreasing the sensitivity of the optical lens during assembly. It should be understood that placing the aperture stop between the third and fourth lenses is merely exemplary, and this application does not impose specific limitations on it; the aperture stop may be placed in other positions as needed.

[0050] In an exemplary embodiment, the surfaces of the fifth and sixth lenses may have one or more aspherical surfaces, which can reasonably control the light deflection of each field of view, effectively reduce various aberrations such as spherical aberration, coma, and distortion, and improve the performance of the optical lens.

[0051] In an exemplary embodiment, the optical lens may further include a filter located between the sixth lens and the image plane to filter light of different wavelengths. The optical lens may also, as needed, provide a protective glass between the filter and the image plane to prevent damage to internal components (e.g., chips) of the optical lens.

[0052] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side. Optionally, the photosensitive element disposed on the second side may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS).

[0053] For ease of subsequent description, in the optical lens provided in this application, the parameters and definitions of the optical lens are as follows: F is the total effective 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, BFL is the optical back focal length of the optical lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, R1 is the radius of curvature of the first side surface of the first lens, R2 is the first The radius of curvature of the second side of the lens, R5 is the radius of curvature of the first side of the third lens, R6 is the radius of curvature of the second side of the third lens, H is the image height corresponding to the maximum field of view of the optical lens, θ is the radian value of the maximum field of view of the optical lens, T23 is the on-axis distance between the second side of the second lens and the first side of the third lens, CT3 is the center thickness of the third lens, T34 is the on-axis distance between the second side of the third lens and the first side of the fourth lens, CT4 is the center thickness of the fourth lens, CT3 is the center thickness of the third lens, and CT2 is the center thickness of the second lens.

[0054] In an exemplary embodiment, the optical lens satisfies: 0.85 ≤ F / ENPD ≤ 1.61. Preferably, 1 ≤ F / ENPD ≤ 1.4. By controlling the ratio of the total effective focal length of the optical lens to the entrance pupil diameter of the optical lens within the range of 0.85 ≤ F / ENPD ≤ 1.61, a small FNO can be achieved, which is beneficial for increasing the amount of light entering the lens.

[0055] In an exemplary embodiment, the optical lens satisfies: 5.34 ≤ TTL / F ≤ 9.17. Preferably, 6.28 ≤ TTL / F ≤ 8. By controlling the ratio of the total optical length of the optical lens to the total focal length, a longer focal length and miniaturization of the optical lens can be achieved.

[0056] In an exemplary embodiment, the optical lens satisfies: 0.13 ≤ BFL / TTL ≤ 0.26. Preferably, 0.1559 ≤ BFL / TTL ≤ 0.23. By controlling the back focal length, a short back focal length is achieved, which facilitates lens miniaturization while ensuring sufficient space for optical element mounting and focusing.

[0057] In an exemplary embodiment, the optical lens satisfies: -2.26 ≤ F1 / F ≤ -1.23. Preferably, -1.97 ≤ F1 / F ≤ -1.44. The first lens has a negative focal length and controls the focal length, which helps to increase the amount of light entering the field of view when receiving light rays and spreading them backward.

[0058] In an exemplary embodiment, the optical lens satisfies: 6.33 ≤ F2 / F ≤ 20.64. Preferably, 7.45 ≤ F2 / F ≤ 18. The second lens has a positive focal length and controls the focal length, smoothly converging the diverging light rays and helping to reduce light sensitivity.

[0059] In an exemplary embodiment, the optical lens satisfies: -29.66 ≤ F3 / F ≤ -9.47. Preferably, -25.8 ≤ F3 / F ≤ -11. The third lens has a negative focal length and controls the focal length, appropriately diffusing the converging light from the second lens, increasing the optical path of the edge field of view, and expanding the aperture, which is beneficial for high light throughput. Controlling the ratio of the focal length of the third lens to the total focal length enables smooth beam transition, reduces light sensitivity, and helps improve resolution.

[0060] In an exemplary embodiment, the optical lens satisfies: 2.98 ≤ F4 / F ≤ 7.3. Preferably, 3.5 ≤ F4 / F ≤ 6.36. The fourth lens has a positive focal length, which can converge the light from the third lens. Controlling the ratio of the focal length of the fourth lens to the total focal lengths enables a smooth beam transition, reduces light sensitivity, and improves resolution.

[0061] In an exemplary embodiment, the optical lens satisfies: 2.91 ≤ F5 / F ≤ 9.68. Preferably, 3.42 ≤ F5 / F ≤ 8.42. The focal length of the fifth lens is positive. By controlling the ratio of the focal length of the fifth lens to the total focal length, the front light is further converged appropriately, achieving a smooth transition of light, reducing light sensitivity, and thus improving resolution.

[0062] In an exemplary embodiment, the optical lens satisfies: 2.84 ≤ F6 / F ≤ 5.15. Preferably, 3.33 ≤ F6 / F ≤ 4.49. The sixth lens has a positive focal length and controls the focal length, further and quickly converging the front-end light rays, achieving a small rear aperture and small TTL, which is beneficial for miniaturization; reducing the light incident angle is beneficial for achieving high resolution.

[0063] In an exemplary embodiment, the optical lens satisfies: 1.25 ≤ R1 / TTL ≤ 4.3. Preferably, 1.47 ≤ R1 / TTL ≤ 3.74. The first side surface of the first lens is convex and its radius of curvature is controlled, receiving light from the field of view and diffusing it backward, which helps to increase the amount of light entering the lens.

[0064] In an exemplary embodiment, the optical lens satisfies: 0.14 ≤ R² / TTL ≤ 0.23. Preferably, 0.16 ≤ R² / TTL ≤ 0.199. The second side surface of the first lens is concave, which increases the optical path difference between the peripheral and central rays, enlarges the aperture, and is beneficial for high light throughput.

[0065] In an exemplary embodiment, the optical lens satisfies: -0.26 ≤ R5 / TTL ≤ -0.16. Preferably, -0.23 ≤ R5 / TTL ≤ -0.19. The first side surface of the third lens is concave and its radius of curvature is controlled, increasing the deflection angle of light within the lens, which helps to collect as much light as possible and increase the amount of light entering the lens.

[0066] In an exemplary embodiment, the optical lens satisfies: -0.36 ≤ R6 / TTL ≤ -0.23. Preferably, -0.32 ≤ R6 / TTL ≤ -0.26. The second side surface of the third lens is convex and its curvature radius is controlled to appropriately converge the received light, reduce the light incident angle, and thus help reduce light sensitivity and achieve high resolution.

[0067] In an exemplary embodiment, the optical lens satisfies: -1.15 ≤ (H / 2 - F × tan(θ / 2)) / (F × tan(θ / 2)) ≤ -0.42. Preferably, -1 ≤ (H / 2 - F × tan(θ / 2)) / (F × tan(θ / 2)) ≤ -0.49. With the same field of view, a wide-angle view is achieved while ensuring controllable distortion in the actual image.

[0068] In an exemplary embodiment, the optical lens satisfies: 0.91 ≤ R5 / (CT3+R6) ≤ 1.55. Preferably, 1.07 ≤ R5 / (CT3+R6) ≤ 1.35. The first side of the third lens is concave, the second side is convex, and the overall shape of the lens is crescent-shaped, which receives and appropriately converges large-diameter light from the front end, thus helping to reduce the rear aperture.

[0069] In an exemplary embodiment, the optical lens satisfies: 0 < (H / 2) / (F×tan(θ / 2)) ≤ 0.58. Preferably, 0.004 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 0.503. By controlling the relationship between H, F, and θ, the ratio of the actual image height to the ideal image height is small, which is beneficial for achieving large angular resolution.

[0070] In an exemplary embodiment, the optical lens satisfies: 10.20 ≤ (F4 + F5 + F6) / F ≤ 17.70. Preferably, 12 ≤ (F4 + F5 + F6) / F ≤ 15.4. The positive power lens near the rear of the lens group serves to converge the light from the front. By controlling the ratio of the overall positive power lens group to the overall focal length, the height of the light at the front of the lens can be effectively reduced, the FNO can be decreased, and the resolution can be optimized.

[0071] In an exemplary embodiment, the optical lens satisfies: 8.56 ≤ R1 / F ≤ 28.91. Preferably, 10 ≤ R1 / F ≤ 25.14. The first side surface of the first lens is convex and crescent-shaped. By controlling R1 and F to satisfy the constraint of the relationship, the first lens can appropriately converge large-aperture light at the front end, which is beneficial to reducing the rear aperture.

[0072] In an exemplary embodiment, the optical lens satisfies: -62.90≤(F2+F3) / T23≤6.52. Preferably, -55≤(F2+F3) / T23≤5.68. By limiting the "correlation strength between the superposition of optical power and the spacing" of the F2 and F3 combination, aberration and optical path stability are precisely controlled: in the positive range, the converging effect of F3 can be used to compensate for the positive spherical aberration of the subsequent positive lens, and in the negative range, the diverging effect of F2 can be used to correct the negative spherical aberration of the preceding lens. The overall numerical range avoids aberration out-of-control due to excessive divergence / convergence of the optical path, while laying a stable optical path foundation for the light reception of subsequent lenses, ensuring imaging accuracy in large field-of-view scenes.

[0073] In an exemplary embodiment, the optical lens satisfies: |F3|<|F2|. |F2|<|F3|, combined with -62.9≤(F2+F3) / T23≤6.52, allows for efficient correction of key aberrations such as spherical aberration, chromatic aberration, and field curvature through the adjustment of optical power between the positive lens F2 (weak convergence) and the negative lens F3 (strong divergence). Simultaneously, while ensuring imaging accuracy, it balances the compactness and light transmission efficiency of the optical system, adapting to the high-precision imaging requirements of a large field of view.

[0074] In an exemplary embodiment, the optical lens satisfies: 0.68 ≤ |F3| / |F2| ≤ 3.78. Preferably, 0.8 ≤ |F3| / |F2| ≤ 3.29. By constraining the ratio of the focal lengths of the second and third lenses, both excessively strong F3 leading to overcorrection of aberrations and insufficiently weak F3 leading to inadequate aberration suppression are avoided, ensuring higher performance consistency during lens assembly.

[0075] In an exemplary embodiment, the optical lens satisfies: 0.28 ≤ (R4 + R5) / (R4 - R5) ≤ 2.29. Preferably, 0.33 ≤ (R4 + R5) / (R4 - R5) ≤ 1.992. By controlling the range within which R4 and R5 satisfy the above relationship, the light beam undergoes deformation in opposite directions on the two surfaces, which can cancel each other out, thereby making the meridional focal line and the sagittal focal line more closely coincident, effectively improving the imaging quality of the off-axis field of view.

[0076] In an exemplary embodiment, the optical lens satisfies: -2.38 ≤ R5 / CT3 ≤ -1.33. Preferably, -2.067 ≤ R5 / CT3 ≤ -1.56. By controlling the thickness and shape of the third lens, excessive refraction of edge rays can be reduced, thereby reducing spherical aberration and coma, and improving image quality.

[0077] In an exemplary embodiment, the optical lens satisfies: -0.25 ≤ R5 / F2 ≤ -0.07. Preferably, -0.22 ≤ R5 / F2 ≤ -0.087. By controlling the ratio range of the radius of curvature of the first side of the third lens to the focal length of the second lens, the pincushion distortion generated by the third lens exactly cancels out the barrel distortion generated by the previous lens, thereby reducing distortion.

[0078] In an exemplary embodiment, the optical lens satisfies: 0 < T34 / F4 ≤ 0.02. Preferably, 0.0043 ≤ T34 / F4 ≤ 0.02. By limiting the gap between the third and fourth lenses to the above range, the fourth lens smoothly receives the light corrected by the preceding lens group, avoiding excessive spacing that could cause optical path disorder and additional astigmatism.

[0079] In an exemplary embodiment, the optical lens satisfies: 0.03 ≤ T34 / CT4 ≤ 0.19. Preferably, 0.036 ≤ T34 / CT4 ≤ 0.163. By defining the above relationship, stray light interference or additional astigmatism / field curvature can be avoided by controlling the ratio of the gap between the third and fourth lenses to the center thickness of the fourth lens, thus optimizing the aberration correction effect across the entire field of view. Furthermore, it can correlate assembly tolerances with lens processing tolerances, improving the consistency of optical performance in mass production and adapting to different scenario requirements.

[0080] In an exemplary embodiment, the optical lens satisfies: 9.22≤CT3 / T34≤41.35. Preferably, 10.84≤CT3 / T34≤35.96. By limiting the above relationship, it is possible to ensure that the center thickness of the third lens is much greater than the gap between the two lenses, thereby stabilizing the corrective effect of the third lens on the front group light and avoiding the introduction of stray light or weakening of aberration control effect due to improper spacing. At the same time, it is possible to accurately constrain T34 with CT3 as a reference, linking assembly tolerance with lens processing tolerance, improving the consistency of optical performance in mass production, and adapting to precision imaging scenarios.

[0081] In an exemplary embodiment, the optical lens satisfies: 0.28 ≤ CT2 / CT3 ≤ 0.66. Preferably, 0.32 ≤ CT2 / CT3 ≤ 0.58. By ensuring that the center thickness of the third lens is much greater than that of the second lens, the third lens has a sufficient optically effective area and stable light receiving capability, avoiding the weakening of the aberration correction effect of the front group (F2-F3) due to excessively thin CT3. At the same time, the processing dimensions of CT3 are constrained by CT2 as a reference, linking the processing tolerances of the two lenses, reducing assembly deviations caused by thickness ratio imbalances, and further improving the optical performance stability of mass production.

[0082] In an exemplary embodiment, the optical lens satisfies: 0.31 ≤ (1 / F4 + 1 / F5) / T34 ≤ 1.35. Preferably, 0.36 ≤ (1 / F4 + 1 / F5) / T34 ≤ 1.18. By limiting the above relationship, the combined converging ability of the fourth and fifth positive lenses can be precisely matched with the spacing between the third and fourth lenses, ensuring a smooth transition of the strong converging optical path generated by the first two positive lenses and preventing optical path transmission disorder. Furthermore, the optical path transmission of the entire optical system remains balanced, effectively suppressing the loss of control over key aberrations such as astigmatism, field curvature, and spherical aberration.

[0083] The optical lens according to the above embodiments of this application can employ multiple lenses, such as the six lenses mentioned above. By rationally allocating the optical parameters of each lens, high resolution, miniaturization, small F-number, short back focal length, high light throughput, low distortion, small aperture, large angular resolution, high illumination, and manufacturability are achieved. Furthermore, it can be well-matched to, for example, automotive chips without producing vignetting. Therefore, the optical lens of the above embodiments of this application better meets the requirements of automotive applications.

[0084] Those skilled in the art should understand that the total optical length (TTL) of the optical lens used above refers to the on-axis distance from the first side of the first lens to the imaging plane or image source plane; the back focal length (BFL) of the optical lens refers to the on-axis distance from the second side of the sixth lens to the imaging plane or image source plane; and the maximum field of view (FOV) of the optical lens is related to the image height (H), which refers to the field of view corresponding to the image height (H).

[0085] However, those skilled in the art will understand that the number of lenses constituting the optical lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although six lenses are described as an example in the embodiments, the optical lens is not limited to including six lenses. If desired, the optical lens may also include other numbers of lenses. All embodiments of this application exhibit a uniform and smooth decrease in modulation transfer function curve from the center to the edge of the field of view in the range of 0 lp / mm to 25 lp / mm, demonstrating good imaging quality and good detail resolution at both low and high frequencies.

[0086] Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings. It should be understood that the units for the radius of curvature and thickness / distance in the basic parameters of the optical lens are mm.

[0087] Example 1

[0088] The following is for reference Figure 1 The optical lens according to Embodiment 1 of this application is described.

[0089] like Figure 1 As shown, the optical lens includes, in sequence from the first side to the second side along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. An aperture stop STO can be positioned between the third lens L3 and the fourth lens L4.

[0090] The first lens L1 has negative optical power, with its first side surface S1 being convex and its second side surface S2 being concave. The second lens L2 has positive optical power, with its first side surface S3 being convex and its second side surface S4 being concave. The third lens L3 has negative optical power, with its first side surface S5 being concave and its second side surface S6 being convex. The fourth lens L4 has positive optical power, with its first side surface S8 being convex and its second side surface S9 being convex. The fifth lens L5 has positive optical power, with its first side surface S10 being convex and its second side surface S11 being convex. The sixth lens L6 has positive optical power, with its first side surface S12 being convex and its second side surface S13 being convex.

[0091] An image plane (IMA) is provided on the second side of the optical lens. When the IMA is the imaging plane, light from the object passes through each surface sequentially and is finally imaged onto the IMA. When the IMA is the image source plane, light from the IMA passes through each surface sequentially and is finally projected onto the object. Table 1 shows the basic parameters of the optical lens of Embodiment 1.

[0092] Table 1

[0093]

[0094] In Embodiment 1, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces, and the surface shape of each aspherical surface can be defined using, but is not limited to, the following aspherical surface formula:

[0095] ;

[0096] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for the aspherical surfaces S12 and S13 in Example 1.

[0097] Table 2

[0098]

[0099] The optical lens of Example 1 has an MTF peak value exceeding 0.61 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens given in Example 1 has good imaging quality.

[0100] Example 2

[0101] The following is for reference Figure 2 Describes an optical lens according to Embodiment 2 of this application. For example... Figure 2As 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.

[0102] Table 3 shows the basic parameters of the optical lens in Example 2.

[0103] Table 3

[0104]

[0105] In Embodiment 2, the first side surface S10 of the fifth lens L5, the second side surface S11 of the fifth lens L5, the first side surface S12 of the sixth lens L6, and the second side surface S13 of the sixth lens L6 are all aspherical surfaces. Table 4 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface S10, S11, S12, and S13 in Embodiment 2.

[0106] Table 4

[0107]

[0108] from Figure 15 As can be seen, the MTF peak value of the optical lens in Example 2 at the center field of view exceeds 0.80 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens given in Example 2 has good imaging quality.

[0109] Example 3

[0110] The following is for reference Figure 3 Describes an optical lens according to Embodiment 3 of this application. For example... Figure 3 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.

[0111] Table 5 shows the basic parameters of the optical lens of Example 3.

[0112] Table 5

[0113]

[0114] In Embodiment 3, the first side surface S10 of the fifth lens L5, the second side surface S11 of the fifth lens L5, the first side surface S12 of the sixth lens L6, and the second side surface S13 of the sixth lens L6 are all aspherical surfaces. Table 6 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface S10, S11, S12, and S13 in Embodiment 3.

[0115] Table 6

[0116]

[0117] from Figure 16 As can be seen, the MTF peak value of the optical lens in Example 3 at the center field of view exceeds 0.82 at a spatial frequency of 25 lp / mm (25 line pairs / mm). Therefore, the optical lens given in Example 3 has good imaging quality.

[0118] Example 4

[0119] The following is for reference Figure 4 Describes an optical lens according to Embodiment 4 of this application. For example... Figure 4 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.

[0120] Table 7 shows the basic parameters of the optical lens in Example 4.

[0121] Table 7

[0122]

[0123] In Example 4, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 8 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S12 and S13 in Example 4.

[0124] Table 8

[0125]

[0126] The optical lens of Example 4 exhibits a peak MTF exceeding 0.82 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens provided in Example 4 possesses superior imaging quality.

[0127] Example 5

[0128] The following is for reference Figure 5 Describes an optical lens according to Embodiment 5 of this application. For example... Figure 5 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.

[0129] Table 9 shows the basic parameters of the optical lens of Example 5.

[0130] Table 9

[0131]

[0132] In Example 5, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 10 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S12 and S13 in Example 5.

[0133] Table 10

[0134]

[0135] The optical lens of Example 5 exhibits a peak MTF exceeding 0.80 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens provided in Example 5 possesses superior imaging quality.

[0136] Example 6

[0137] The following is for reference Figure 6 Describes an optical lens according to Embodiment 6 of this application. For example... Figure 6 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.

[0138] Table 11 shows the basic parameters of the optical lens of Example 6.

[0139] Table 11

[0140]

[0141] In Embodiment 6, the first side surface S10 of the fifth lens L5, the second side surface S11 of the fifth lens L5, the first side surface S12 of the sixth lens L6, and the second side surface S13 of the sixth lens L6 are all aspherical surfaces. Table 12 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface S10, S11, S12, and S13 in Embodiment 6.

[0142] Table 12

[0143]

[0144] The optical lens of Example 6 exhibits a peak MTF exceeding 0.64 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens provided in Example 6 possesses superior imaging quality.

[0145] Example 7

[0146] The following is for reference Figure 7 Describes an optical lens according to Embodiment 7 of this application. For example... Figure 7As 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; and the first side surface S8 of the fourth lens L4 is concave, while the second side surface S9 of the fourth lens L4 is convex.

[0147] Table 13 shows the basic parameters of the optical lens of Example 7.

[0148] Table 13

[0149]

[0150] In Example 7, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 14 gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S12 and S13 in Example 7.

[0151] Table 14

[0152]

[0153] The optical lens of Example 7 exhibits a peak MTF exceeding 0.8 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens provided in Example 7 possesses superior imaging quality.

[0154] Example 8

[0155] The following is for reference Figure 8 Describes an optical lens according to Embodiment 8 of this application. For example... Figure 8 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; and the second side surface S11 of the fifth lens L5 is concave. Table 15 shows the basic parameters of the optical lens of Embodiment 8.

[0156] Table 15

[0157]

[0158] In Example 8, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 16 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S12 and S13 in Example 8.

[0159] Table 16

[0160]

[0161] The optical lens of Example 8 exhibits a peak MTF exceeding 0.83 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens provided in Example 8 possesses superior imaging quality.

[0162] Example 9

[0163] The following is for reference Figure 9 Describes an optical lens according to Embodiment 9 of this application. For example... Figure 9 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; and the first side surface S12 of the sixth lens L6 is concave. Table 17 shows the basic parameters of the optical lens of Embodiment 9.

[0164] Table 17

[0165]

[0166] In Example 9, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 18 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S12 and S13 in Example 9.

[0167] Table 18

[0168]

[0169] The optical lens of Example 9 exhibits a peak MTF exceeding 0.80 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens provided in Example 9 possesses superior imaging quality.

[0170] Example 10

[0171] The following is for reference Figure 10 Describes an optical lens according to Embodiment 10 of this application. For example... Figure 10 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; and the first side surface S3 of the second lens L2 is concave, the second side surface S4 of the second lens L2 is convex, and the first side surface S10 of the fifth lens L5 is concave. Table 19 shows the basic parameters of the optical lens of Embodiment 10.

[0172] Table 19

[0173]

[0174] In Example 10, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 20 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S12 and S13 in Example 10.

[0175] Table 20

[0176]

[0177] The optical lens of Example 10 has a peak MTF of over 0.73 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens of Example 10 has good imaging quality.

[0178] Example 11

[0179] The following is for reference Figure 11 Describes an optical lens according to Embodiment 11 of this application. For example... Figure 11 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; and the second side surface S9 of the fourth lens L4 is concave, while the first side surface S12 of the sixth lens L6 is concave.

[0180] Table 21 shows the basic parameters of the optical lens of Example 11.

[0181] Table 21

[0182]

[0183] In Example 11, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 22 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S12 and S13 in Example 11.

[0184] Table 22

[0185]

[0186] The optical lens of Example 11 has a peak MTF value exceeding 0.70 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens given in Example 11 has good imaging quality.

[0187] Example 12

[0188] The following is for reference Figure 12 Describes an optical lens according to Embodiment 12 of this application. For example... Figure 12As 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; and the second side surface S13 of the sixth lens L6 is concave. Table 23 shows the basic parameters of the optical lens of Embodiment 12.

[0189] Table 23

[0190]

[0191] In Example 12, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 24 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S12 and S13 in Example 12.

[0192] Table 24

[0193]

[0194] The optical lens of Example 12 has an MTF peak value exceeding 0.60 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens given in Example 12 has good imaging quality.

[0195] Example 13

[0196] The following is for reference Figure 13 Describes an optical lens according to Embodiment 13 of this application. For example... Figure 13 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.

[0197] Table 25 shows the basic parameters of the optical lens of Example 13.

[0198] Table 25

[0199]

[0200] In Example 13, the first side surface S10 of the fifth lens L5, the second side surface S11 of the fifth lens L5, the first side surface S12 of the sixth lens L6, and the second side surface S13 of the sixth lens L6 are all aspherical surfaces. Table 26 gives the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface S10, S11, S12, and S13 in Example 13.

[0201] Table 26

[0202]

[0203] The optical lens of Example 13 has an MTF peak value exceeding 0.75 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens given in Example 13 has good imaging quality.

[0204] Example 14

[0205] The following is for reference Figure 14 Describes an optical lens according to Embodiment 14 of this application. For example... Figure 14 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 second side surface S11 of the fifth lens L5 is a convex surface that is close to a plane, and the first side surface S12 of the sixth lens L6 is a concave surface that is close to a plane. Table 27 shows the basic parameter table of the optical lens of Embodiment 14.

[0206] Table 27

[0207]

[0208] In Example 14, the first side surface S12 and the second side surface S13 of the sixth lens L6 are both aspherical surfaces. Table 28 gives the conic coefficient k and higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical surface S12 and S13 in Example 14.

[0209] Table 28

[0210]

[0211] The optical lens of Example 14 exhibits a peak MTF exceeding 0.78 at a spatial frequency of 25 lp / mm (25 line pairs / mm) in its center field of view. Therefore, the optical lens provided in Example 14 possesses superior imaging quality.

[0212] Table 29 lists the basic parameters of the optical lenses used in Examples 1-14. The unit for FOV in the table is °, θ is a dimensionless parameter, and the units for other parameters are mm.

[0213] Table 29

[0214]

[0215] In summary, the conditional expressions of each embodiment in Examples 1-22 satisfy the relationships shown in Table 30.

[0216] Table 30

[0217]

[0218] This application also provides an electronic device including an optical lens as described in the exemplary embodiments above and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The imaging element is disposed on a second side of the optical lens, for example, on an imaging surface, and may be, for example, a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). Light from the first side is imaged on the second side after passing through the optical lens.

[0219] This application also provides an electronic device including an optical lens and a light source as described in the exemplary embodiments above, with the light source located on a second side of the optical lens. Light emitted from the light source is projected onto a first side of the optical lens after passing through it, forming an image or illuminating an area on the first side.

[0220] This application also provides an electronic device, including a first device and a second device. The first device may be, for example, a lidar transmitter, and the second device may be, for example, a lidar receiver. The first device may include the optical lens and light source as described in the exemplary embodiments above. The light source is located on the second side of the optical lens, and the light emitted by the light source is projected onto the first side of the optical lens after passing through the optical lens, forming an image or illuminating an area on the first side. The second device may include the optical lens as described in the exemplary embodiments above and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The imaging element is disposed on the second side of the optical lens (e.g., disposed on the imaging surface), and the imaging element may be, for example, a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The light from the first side is imaged on the second side after passing through the optical lens.

[0221] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

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 with negative 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 positive optical power; A third lens with negative optical power, wherein the first side surface of the third lens is concave and the second side surface of the third lens is convex; A fourth lens with positive optical power; A fifth lens with positive optical power; A sixth lens with positive optical power; The optical lens has six lenses with optical power. The optical lens satisfies the following conditions: -0.25≤R5 / F2≤-0.07 and 0.31≤(1 / F4+1 / F5) / T34≤1.35; Wherein, R5 is the radius of curvature of the first side surface of the third lens, F2 is the effective focal length of the second lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, and T34 is the gap between the third lens and the fourth lens.

2. The optical lens according to claim 1, characterized in that, The first and second sides of the second lens are convex and convex respectively, or the first and second sides of the second lens are convex and concave respectively, or the first and second sides of the second lens are concave and convex respectively; the first and second sides of the fourth lens are convex and convex respectively, or the first and second sides of the fourth lens are convex and concave respectively, or the first and second sides of the fourth lens are concave and convex respectively; the first and second sides of the fifth lens are convex and convex respectively, or the first and second sides of the fifth lens are convex and concave respectively, or the first and second sides of the fifth lens are concave and convex respectively.

3. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 5.34≤TTL / F≤9.17, 0.13≤BFL / TTL≤0.26; where TTL is the total optical length of the optical lens and F is the total effective focal length of the optical 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: 0≤(H / 2) / (F×tan(θ / 2))≤0.58, -1.15≤(H / 2-F×tan(θ / 2)) / (F×tan(θ / 2))≤-0.42; where H is the image height corresponding to the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, and θ is the radian value of the maximum field of view of the optical lens.

5. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following condition: -2.26≤F1 / F≤-1.23, where F1 is the effective focal length of the first lens and F is the total effective focal length of the optical lens.

6. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies: 6.33≤F2 / F≤20.64, where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens.

7. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following condition: -29.66≤F3 / F≤-9.47, where F3 is the effective focal length of the third lens and F is the total effective focal length of the optical lens.

8. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following condition: 2.98≤F4 / F≤7.3, where F4 is the effective focal length of the fourth lens and F is the total effective focal length of the optical lens.

9. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following condition: 2.91≤F5 / F≤9.68, where F5 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens.

10. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following condition: 2.84≤F6 / F≤5.15, where F6 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens.

11. 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≤1.61, 1.25≤R1 / TTL≤4.3, 0.14≤R2 / TTL≤0.23, -0.26≤R5 / TTL≤-0.16, -0.36≤R6 / TTL≤-0.23; where F is the total effective 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, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, R5 is the radius of curvature of the first side surface of the third lens, and R6 is the radius of curvature of the second side surface of the third lens.

12. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 8.56≤R1 / F≤28.91, 0.91≤R5 / (CT3+R6)≤1.55; where R1 is the radius of curvature of the first side of the first lens, F is the total effective focal length of the optical lens, R5 is the radius of curvature of the first side of the third lens of the optical lens, R6 is the radius of curvature of the second side of the third lens of the optical lens, and CT3 is the center thickness of the third lens of the optical lens.

13. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: -62.9≤(F2+F3) / T23≤6.52, 10.2≤(F4+F5+F6) / F≤17.7, 0.68≤|F3| / |F2|≤3.78, where F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, T23 is the on-axis distance between the second side surface of the second lens and the first side surface of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, and F is the total effective focal length of the optical lens.

14. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies: |F2| < |F3|; where F2 is the effective focal length of the second lens and F3 is the effective focal length of the third lens.

15. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 0≤T34 / F4≤0.02, 0.03≤T34 / CT4≤0.19, 9.22≤CT3 / T34≤41.35, 0.28≤CT2 / CT3≤0.66; where T34 is the on-axis distance between the second side surface of the third lens and the first side surface of the fourth lens, F4 is the effective focal length of the fourth lens, CT2 is the center thickness of the second lens of the optical lens, CT3 is the center thickness of the third lens of the optical lens, and CT4 is the center thickness of the fourth lens 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: 0.28≤(R4+R5) / (R4-R5)≤2.29, -2.38≤R5 / CT3≤-1.33; where R4 is the radius of curvature of the second side surface of the second lens, R5 is the radius of curvature of the first side surface of the third lens, and CT3 is the center thickness of the third lens.

17. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies at least one of the following relationships: 1≤F / ENPD≤1.4, 6.28≤TTL / F≤8, 0.1559≤BFL / TTL≤0.23, -1.97≤F1 / F≤-1.44, 7.45≤F2 / F≤18, -25.8≤F3 / F≤-11, 3.5≤F4 / F≤6.36, 3.42≤F5 / F≤8.42, 3 .33≤F6 / F≤4.49, 1.47≤R1 / TTL≤3.74, 0.16≤R2 / TTL≤0.199, -0.23≤R5 / TTL≤-0.19, -0 .32≤R6 / TTL≤-0.26, -1≤(H / 2-F×tan(θ / 2)) / (F×tan(θ / 2))≤-0.49, 1.07≤R5 / (CT3+R6 )≤1.35, 0.004≤(H / 2) / (F×tan(θ / 2))≤0.503, 12≤(F4+F5+F6) / F≤15.4, 10≤R1 / F≤25.

14. -55≤(F2+F3) / T23≤5.68, 0.8≤|F3| / |F2|≤3.29, 0.33≤(R4+R5) / (R4-R5)≤1.992, - 2.067≤R5 / CT3≤-1.56, -0.22≤R5 / F2≤-0.087, 0.0043≤T34 / F4≤0.02, 0.036≤T34 / CT4 ≤0.163, 10.84≤CT3 / T34≤35.96, 0.32≤CT2 / CT3≤0.58, 0.36≤(1 / F4+1 / F5) / T34≤1.18; Wherein, F is the total effective 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, BFL is the optical back focal length of the optical lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F6 is the effective focal length of the sixth lens, R1 is the radius of curvature of the first side surface of the first lens, R2 is the radius of curvature of the second side surface of the first lens, R5 is the radius of curvature of the first side surface of the third lens, R6 is the radius of curvature of the second side surface of the third lens, H is the image height corresponding to the maximum field of view of the optical lens, θ is the radian value of the maximum field of view of the optical lens, T23 is the axial distance between the second side surface of the second lens and the first side surface of the third lens, T34 is the axial 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, CT3 is the center thickness of the third lens, and CT2 is the center thickness of the second lens.

18. An electronic device, characterized in that, include: Optical lens according to any one of claims 1 to 17; 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.

Images