Optical lens and electronic device

Abstract

An optical lens and electronic device are disclosed, relating to the field of optical components. The optical lens, along its optical axis from a first side to a second side, sequentially includes: a first lens with negative optical power, its first side surface being convex and its second side surface being concave; a second lens with positive optical power, its first side surface being convex; a third lens with negative optical power, its first side surface being concave and its second side surface being concave; a fourth lens with positive optical power, its second side surface being convex; a fifth lens with positive optical power, its first side surface being convex; and a sixth lens with negative optical power, its first side surface being concave; the optical lens comprises six lenses with optical power; the first, second, third, fourth, fifth, and sixth lenses are all all-glass spherical lenses. This optical lens exhibits high light transmission and relative illumination, high resolution, high image quality, high stability, low cost, and can be miniaturized.

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] With the advancement of intelligent driving technology, advanced intelligent driving has gradually entered the public eye, and the solutions for intelligent driving are relatively open and transparent, namely visual perception and radar technology. Automotive optical lenses play a crucial role in long-distance detection and high-performance visual imaging, maintaining stable and efficient performance output even in low-cost, small-space, and harsh environments. For example, on highways, the forward-facing camera of an Advanced Driver-Assistance System (ADAS) can automatically determine distance to other vehicles, perform timely braking and acceleration, or achieve automatic lane changing and collision warning.

[0003] With technological advancements and fierce industry competition, high-performance, cost-effective lenses are currently key to breaking through the current limitations. In optical lenses, the more complex the lens surface shape, the greater the degree of freedom for optimization. However, spherical lenses can only provide one variable for surface shape control: the radius of curvature at the center of the sphere. Aspherical lenses, on the other hand, can introduce higher-order aspherical coefficients as additional variables depending on the expression, making aspherical designs more likely to offer better performance than spherical designs. Under the design requirement of cost reduction, achieving the imaging requirements of optical lenses containing aspherical lenses using an all-glass spherical lens is a goal pursued by those skilled in the art.

[0004] Furthermore, the limited space of existing automotive optical lenses restricts their performance requirements for high resolution and high light throughput, making it impossible to achieve a balance between low cost and high performance. Moreover, harsh environments lead to further material and structural limitations, which exacerbate the trend of declining resolution and sensitivity in automotive optical lenses. Summary of the Invention

[0005] This application aims to provide an optical lens and electronic device to solve at least one of the above-mentioned technical problems.

[0006] The first aspect of this application provides an optical lens comprising, along an optical axis from a first side to a second side: a first lens having negative optical power, wherein its first side surface is convex and its second side surface is concave; a second lens having positive optical power, wherein its first side surface is convex; a third lens having negative optical power, wherein its first side surface is concave and its second side surface is concave; a fourth lens having positive optical power, wherein its second side surface is convex; a fifth lens having positive optical power, wherein its first side surface is convex; and a sixth lens having negative optical power, wherein its first side surface is concave. The number of lenses with optical power is six; the first, second, third, fourth, fifth, and sixth lenses are all all-glass spherical lenses; the optical lenses satisfy the following relationships: 1.35≤F / ENPD≤1.8, 1.5≤TTL / F≤2.7, -0.42≤F / F1≤-0.1, and 1.3≤F5 / F≤1.75; where F is the focal length of the entire optical lens group, ENPD is the entrance pupil diameter of the optical lens, TTL is the total optical length of the optical lens, F1 is the focal length of the first lens, and F5 is the focal length of the fifth lens.

[0007] According to an exemplary embodiment of this application, the second side surface of the second lens is concave; or, the second side surface of the second lens is convex; the first side surface of the fourth lens is concave; or, the first side surface of the fourth lens is convex; the second side surface of the fifth lens is concave; or, the second side surface of the fifth lens is convex; the second side surface of the sixth lens is convex; or, the second side surface of the sixth lens is concave.

[0008] In this application, the letters have the following meanings: DFOV is the maximum field of view of the optical lens; H is the image height corresponding to the maximum field of view of the optical lens; θ is the radian value of the maximum field of view of the optical lens; DMAX is the maximum value among the maximum aperture values ​​of all lenses corresponding to the maximum field of view of the optical lens; D11 is the maximum aperture value of the first side of the first lens corresponding to the maximum field of view of the optical lens; BFL is the optical back focal length of the optical lens; DST is the effective aperture of the aperture stop; R11 is the center radius of curvature of the first side of the first lens; CT1 is the center thickness of the first lens; R12 is the center radius of curvature of the second side of the first lens; CT4 is the center thickness of the fourth lens; CT5 is the center thickness of the fifth 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; F6 is the focal length of the sixth lens; SAG42 is the maximum aperture value of the optical lens. The sag of the second side of the fourth lens corresponding to the large field of view; SAG51 is the sag of the first side of the fifth lens corresponding to the maximum field of view of the optical lens; R42 is the central radius of curvature of the second side of the fourth lens; FR51 is the image-side focal length of the first side of the fifth lens; CTmax is the maximum value of the center thickness from the third to the fifth lens; CTmin is the minimum value of the center thickness from the third to the fifth lens; R61 is the central radius of curvature of the first side of the sixth lens; T56 is the air gap between the fifth and sixth lenses; ET1 is the edge thickness of the first lens; CT6 is the center thickness of the sixth lens; T12 is the air gap between the first and second lenses; R21 is the central radius of curvature of the first side of the second lens; R31 is the central radius of curvature of the first side of the third lens; and R32 is the central radius of curvature of the second side of the third lens.

[0009] According to an exemplary embodiment of this application, the total optical length (TTL) of the optical lens satisfies: 27 ≤ TTL / 1mm ≤ 35.

[0010] According to an exemplary embodiment of this application, the focal length F of the entire optical lens group and the image height H corresponding to the maximum field of view of the optical lens satisfy: 1.25≤F / H≤2.25.

[0011] According to an exemplary embodiment of this application, the image height H corresponding to the maximum field of view of the optical lens, the focal length F of the entire optical lens group, and the radian value θ of the maximum field of view of the optical lens satisfy: 0.9≤(H / 2) / (F×tan(θ / 2))≤1.1.

[0012] According to an exemplary embodiment of this application, the central curvature radius R11 of the first side surface of the first lens, the central thickness CT1 of the first lens, and the central curvature radius R12 of the second side surface of the first lens satisfy: 0.75≤R11 / (CT1+R12)≤1.8.

[0013] According to an exemplary embodiment of this application, the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy the following condition: 0.75≤CT4 / CT5≤1.6.

[0014] According to an exemplary embodiment of this application, the focal length F2 of the second lens and the focal length F of the entire optical lens group satisfy: 0.6≤F2 / F≤1.5.

[0015] According to an exemplary embodiment of this application, the focal length F3 of the third lens and the focal length F of the entire optical lens group satisfy: -0.85≤F3 / F≤-0.4.

[0016] According to an exemplary embodiment of this application, the focal length F4 of the fourth lens and the focal length F of the entire optical lens group satisfy: 0.5≤F4 / F≤1.5.

[0017] According to an exemplary embodiment of this application, the focal length F6 of the sixth lens and the focal length F of the entire optical lens group satisfy: -1.45≤F6 / F≤0.75.

[0018] According to an exemplary embodiment of this application, the sagitta SAG42 of the second side of the fourth lens corresponding to the maximum field of view of the optical lens and the sagitta SAG51 of the first side of the fifth lens corresponding to the maximum field of view of the optical lens satisfy: -1.3≤SAG42 / SAG51≤-0.6.

[0019] According to an exemplary embodiment of this application, the single-sided focal length FR51 of the first side of the fifth lens and the total focal length F of the optical lens group satisfy: 1.6≤FR51 / F≤3.

[0020] According to an exemplary embodiment of this application, the maximum value CTmax of the center thickness of the third to fifth lenses and the minimum value CTmin of the center thickness of the third to fifth lenses satisfy: 1≤CTmax / CTmin≤2.

[0021] According to an exemplary embodiment of this application, the central curvature radius R61 of the first side of the sixth lens and the air gap T56 between the fifth and sixth lenses satisfy: -3.8≤R61 / T56≤-0.95.

[0022] According to an exemplary embodiment of this application, the center thickness CT1 of the first lens and the edge thickness ET1 of the first lens satisfy: 0.85≤ET1 / CT1≤1.4.

[0023] According to an exemplary embodiment of this application, the center thickness CT6 of the sixth lens and the focal length F of the entire optical lens group satisfy: 0.035≤CT6 / F≤0.125.

[0024] According to an exemplary embodiment of this application, the central curvature radius R12 of the second side of the first lens, the air gap T12 between the first lens and the second lens, and the central curvature radius R21 of the first side of the second lens satisfy: 0.7≤(R12+T12) / R21≤1.2.

[0025] According to an exemplary embodiment of this application, the maximum field of view (DFOV) of the optical lens satisfies: 25 ≤ DFOV / 1° ≤ 45.

[0026] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 52≤(DFOV×F) / H / 1°≤65, 4.7≤TTL / H / θ×1rad≤7.4, 2.3≤TTL / DMAX≤3.2, 0.65≤(F×θ) / D11 / 1rad≤0.9, 0.025≤D11 / H / DFOV×1°≤0.055, 0.06≤D11 / H / F×1mm≤0 .12、0<|(HF×θ) / (F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.045、0.07≤BFL / TTL≤0.15、0.1≤F / ENPD / D11×1mm≤0.16、0.4≤DST / F≤0.7、-1.2≤R42 / F≤-0.65、0.4≤R11 / F≤1.65 or -1.5≤R31 / R32≤-0.35、

[0027] According to an exemplary embodiment of this application, the optical lens satisfies at least one of the following relationships: 56.838≤(DFOV×F) / H / 1°≤59.044, 1.777≤TTL / F≤2.455, 5.013≤TTL / H / θ×1rad≤7.061, 2.5≤TTL / DMAX≤2.931, 0.791≤(F×θ) / D11 / 1rad≤0.822, 0.031≤D11 / H / DFOV×1°≤0.044, 0.068≤D11 / H / F×1mm≤0 .094, 0≤|(HF×θ) / (F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.03, 0.074≤BFL / TTL≤0.138, 1.438≤F / H≤1.986, 1.4≤F / ENP D≤1.7, 0.121≤F / ENPD / D11×1mm≤0.147, 0.479≤DST / F≤0.603, 0.941≤(H / 2) / (F×tan(θ / 2))≤0.986, -0.4≤F / F1≤-0.157, 1.35≤F5 / F≤1.47, 0.977≤R11 / (CT1+R12)≤1.688, 0.871≤CT4 / CT5≤1.401, 0.785≤F2 / F≤1.255, -0.735≤F3 / F≤-0.535, 0 .693≤F4 / F≤1.331, -1.257≤F6 / F≤-0.935, -1.097≤SAG42 / SAG51≤-0.794, -0.933≤R42 / F≤-0.748, 1.845≤FR51 / F≤2.616 1.144≤CTmax / CTmin≤1.901, -3.222≤R61 / T56≤-1.157, 0.941≤ET1 / CT1≤1.272, 0.044≤CT6 / F≤0.105, 0.675≤R11 / F≤1.309, 0.866≤(R12+T12) / R21≤0.99, -1.21≤R31 / R32≤-0.512, 29.0038≤TTL / 1mm≤34.0024 or 28.6371≤DFOV / 1°≤40.3334.

[0028] 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.

[0029] The optical lens according to the embodiments of this application employs six lenses with optical power. The first lens has negative optical power, which can smoothly gather large-angle light rays and reduce the incident angle of light from the rear lenses. The negative optical power of the first lens can also significantly improve edge relative illumination, ensuring that the illumination loss at the four corners of the image is controlled within a certain range; the negative optical power of the first lens also helps to correct and eliminate field curvature and astigmatism. The first side of the first lens is convex, which helps to avoid the risk of water and dust accumulation and can receive light rays at a wider angle, ensuring the overall light transmission of the optical lens. The second side of the first lens is concave. The second side is the aberration contribution surface of the first lens, representing the aberrations to be corrected in front of the optical lens, mainly field curvature, astigmatism, and spherical aberration, thereby sharing the image quality pressure of the rear lenses, thus enabling a more reasonable distribution of optical power and improving the resolving power of the optical lens.

[0030] The second lens has positive optical power, converging the diverging light rays from the first lens and reducing the lens aperture. The second lens and the first lens form a positive and negative lens group, achieving an extended back intercept. The positive optical power of the second lens performs pre-compensation for primary chromatic aberration, field curvature, and off-axis aberrations, balancing the aberration correction pressure on the optical lens. The positive optical power of the second lens also optimizes the incident angle of light on various surfaces, suppresses stray light, improves edge illumination, and enhances the thermal stability and manufacturability of the optical lens. The first side of the second lens is convex, used to smoothly transition the light rays emitted from the first lens, reducing the tolerance sensitivity of the second lens, while simultaneously converging the light rays and reducing the front-end lens aperture. The convex first side of the second lens also compensates for a large number of primary aberrations introduced by the first lens, improving the resolving power of the optical lens.

[0031] The third lens has negative optical power, which can balance the field curvature introduced by the front group of lenses, control the light path of a large field of view, optimize the principal ray angle of the entire field of view, and adjust the incident angle of each field of view to prevent color cast. The first side of the third lens is concave, and the second side of the third lens is also concave. The double concave shape of the third lens forms a symmetrical structure with the first and second lenses. At the same time, the optical power is also symmetrical. This structure is conducive to chromatic aberration balance and also has a corrective effect on off-axis astigmatism and coma.

[0032] The fourth lens has positive optical power and converges light rays for the first time, effectively reducing the light beam height and decreasing the aperture of the subsequent lens group, thus achieving miniaturization and low cost. In terms of performance, the positive optical power of the fourth lens effectively controls edge rays, particularly noticeable in correcting coma and field curvature. The optimization of the edge field of view further reduces chromatic aberration, allowing for further performance improvements. The second side of the fourth lens is convex and is the primary surface for aberrations. The spherical aberration and field curvature required by the optical lens are mainly contributed by the second side of the fourth lens.

[0033] The fifth lens has positive optical power, further compressing light and enabling miniaturization of the optical lens. The reintroduction of positive optical power in the fifth lens allows for a more rational focal length distribution, preventing concentration on any single element. This rational focal length distribution allows the lens to maintain relatively stable performance under high and low temperature conditions. The first side of the fifth lens is convex, ensuring that a large amount of upward-facing light from the fourth lens can be fully received by the fifth lens, increasing the effective light transmission of the optical lens to some extent. The convex first side of the fifth lens also significantly compresses light, maintaining the miniaturization of the rear aperture of the optical lens. Furthermore, the convex first side of the fifth lens largely corrects for front group spherical aberration, adjusting the way light enters the image plane.

[0034] The sixth lens has negative optical power and provides negative field curvature, correcting residual aberrations in the optical lens. Its negative optical power ensures that light is fully corrected before it falls on the image, resulting in significant improvements in illumination, resolution, and color cast. The first side of the sixth lens is concave, collecting and converging light rays, and its surface shape is used for aberration correction.

[0035] The first, second, third, fourth, fifth, and sixth lenses are all all-glass spherical lenses. The lenses from the first to the sixth lens are made of glass, and through the combination of materials and structure, a heat-free function is achieved.

[0036] By rationally allocating the optical power ratio of the six lenses, the lens surface structure, and the center thickness and curvature parameters of each lens on the optical axis, while controlling the overall size and optical ratio of the optical lens, the optical lens can meet the following requirements: 1.35≤F / ENPD≤1.8, 1.5≤TTL / F≤2.7, -0.42≤F / F1≤-0.1, and 1.3≤F5 / F≤1.75. This enables the realization of a low-cost Chexi telephoto lens that also achieves a large aperture and low sensitivity.

[0037] The focal length F of the entire optical lens assembly and the entrance pupil diameter ENPD of the optical lens satisfy the condition: 1.35≤F / ENPD≤1.8, which gives the optical lens a large aperture and enables it to adapt to low-light environments during use.

[0038] The total optical length (TTL) of the optical lens and the focal length (F) of the entire optical lens assembly satisfy the condition: 1.5≤TTL / F≤2.7. This balances the total optical length and focal length of the optical lens, achieving the long focal length and miniaturization characteristics required for the optical lens.

[0039] The focal length F of the entire optical lens group and the focal length F1 of the first lens satisfy: -0.42≤F / F1≤-0.1. The first lens can share the pressure of the rear lens group and guide more light into the optical lens, which is beneficial for telephoto and high light transmission and improves the relative illumination of the optical lens.

[0040] The focal length F5 of the fifth lens satisfies the following condition with the focal length F of the entire optical lens group: 1.35≤F5 / F≤1.47. This not only helps to further converge and compress light to prevent the rear port diameter and the total length of the optical lens from being too large, but also allows the field curvature caused by the negative film in front to be corrected here, which is conducive to the miniaturization of the optical lens and high resolution. Attached Figure Description

[0041] 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. Figures 1-14 Schematic diagrams of the optical lenses according to Embodiments 1-14 of this application are shown respectively; Figure 15 The modulation transfer function (MTF) curve of the optical lens according to Embodiment 1 of this application is shown. Figure 16 A schematic diagram of the distortion of an optical lens according to Embodiment 1 of this application is shown; Figure 17 A schematic diagram of the relative illumination of an optical lens according to Embodiment 1 of this application is shown; Figure 18 A schematic diagram showing the height of the second side of the fourth lens corresponding to the maximum field of view of the optical lens according to an embodiment of the present application and the height of the first side of the fifth lens corresponding to the maximum field of view of the optical lens; Figure 19 A schematic diagram showing the edge thickness and center thickness of the first lens of an optical lens according to an embodiment of this application is shown.

[0042] Explanation of reference numerals in the attached figures: First lens L1; Second lens L2; ​​Third lens L3; Fourth lens L4; Fifth lens L5; Sixth lens L6; Aperture stop STO; Protective glass L7; Filter L8; Image plane IMA; The first side surface S1 of the first lens L1, and the second side surface S2 of the first lens L1; The first side surface S3 of the second lens L2, the second side surface S4 of the second lens L2; The first side surface S5 of the third lens L3, the second side surface S6 of the third lens L3; The first side surface S7 of the fourth lens L4, and the second side surface S8 of the fourth lens L4; The first side surface S9 of the fifth lens L5, and the second side surface S10 of the fifth lens L5; The first side surface S11 of the sixth lens L6, and the second side surface S12 of the sixth lens L6; The first side of the protective glass L7 is S13, and the second side of the protective glass L7 is S14. The first side surface S15 of filter L8, and the second side surface S16 of filter L8. Detailed Implementation

[0043] 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 descriptions 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. 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 indicate any limitation on the features. Therefore, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of this application. In the drawings, for ease of illustration, the thickness, size, and shape of the lenses have been slightly exaggerated. Specifically, the shapes of spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly drawn to scale.

[0044] In this document, 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. 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 term "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. Unless otherwise specified, all terms used herein (including technical and scientific terms) 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., terms defined in common dictionaries) should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense, unless expressly so defined herein. 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.

[0045] The features, principles and other aspects of this application are described in detail below.

[0046] 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.

[0047] In an example embodiment, the optical lens can be used as, for example, an imaging optical lens. In this case, the first side of the optical lens can be the object side, and the second side can be the image side. Light from the object side can be imaged on the image side. The second side of the optical lens is provided with an imaging surface. The imaging optical lens can be a vehicle-mounted optical lens, a security monitoring optical lens, or a radar receiver optical lens. In an example embodiment, the optical lens can be used as, for example, a projection optical lens or a lidar transmitter optical lens. In this case, the second side of the optical lens can be the image source side, and the first side can be the imaging side. Light from the image source side can be imaged on the imaging side. The second side of the optical lens is provided with an image source surface. In an example embodiment, the optical lens provided in this application can be used as a light-receiving optical lens or a light-emitting optical lens. The light-receiving optical lens is typically used to collect light from the object-side space. The collected light is used to form detection information, including but not limited to imaging and laser point clouds. The light-emitting optical lens is typically used to transmit light from a light-emitting unit to the object-side space. According to the function of the light, the light transmitted to the object-side space can be divided into projection light for forming a projected image or detection light for detecting target information, etc. It is understood that when the optical lens provided in this application is used as a light-receiving optical lens such as a camera optical lens, a lidar receiver optical lens, a microscopic optical lens, or a telescope optical lens, the term "first side" as used herein can refer to the object side, and "second side" can 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 optical lens can be, for example, a vehicle-mounted camera, an infrared camera, a drone camera, a night vision camera, or a security monitoring camera. When the optical lens provided in this application is used as a light-emitting optical lens such as a projection optical lens or a lidar transmitter optical lens, the term "first side" as used herein can refer to the object side, and "second side" can refer to the light source side. In some possible implementations, the optical lens provided in this application can also simultaneously perform light-receiving and light-emitting functions. For example, the optical lens provided in this application is used in a lidar optical lens that shares a light-receiving and light-emitting path, where the optical lens simultaneously performs the functions of emitting laser light and receiving radar echo beams. For example, the optical lens provided in this application is used in an optical communication and radar integration optical lens, which simultaneously performs the functions of transmitting modulated optical signals and receiving radar echo beams.

[0048] In the example embodiment, the first lens has negative optical power, which can smoothly gather large-angle light rays and reduce the incident angle of light rays from the rear lenses. The negative optical power of the first lens can also significantly improve edge relative illumination, ensuring that illumination loss at the four corners of the image is controlled within a certain range; the negative optical power of the first lens also helps to correct and eliminate field curvature and astigmatism. The first side of the first lens is convex, which helps to avoid the risk of water and dust accumulation and can receive light rays at a wider angle, ensuring the overall light transmission of the optical lens. The second side of the first lens is concave. The second side is the aberration contributing surface of the first lens, representing the aberrations to be corrected in front of the optical lens, mainly field curvature, astigmatism, and spherical aberration, thereby sharing the image quality pressure of the rear lenses, thus allowing for a more reasonable allocation of optical power and improving the resolving power of the optical lens.

[0049] In the example embodiment, the second lens has positive optical power, converging the diverging light rays from the first lens and compressing the lens aperture. The second lens and the first lens form a positive and negative lens group, achieving a longer back intercept. The positive optical power of the second lens performs pre-compensation for primary chromatic aberration, field curvature, and off-axis aberrations, balancing the aberration correction pressure of the optical lens. The positive optical power of the second lens also optimizes the incident angle of light rays on each surface, suppresses stray light, improves edge illumination, and enhances the thermal stability and manufacturability of the optical lens. The first side of the second lens is convex, used to smoothly transition the light rays emitted from the first lens, reducing the tolerance sensitivity of the second lens, while converging the light rays and reducing the front lens aperture. The convex first side of the second lens can also compensate for a large number of primary aberrations introduced by the first lens, improving the resolving power of the optical lens. The second side of the second lens is concave or convex, working in conjunction with the first side of the second lens to converge the light rays, while also allowing the light rays to match different pupils, achieving a large aperture effect.

[0050] In the example implementation, the third lens has negative optical power, which can balance the field curvature introduced by the front group of lenses, control the light path of the large field of view, optimize the chief ray angle (CRA) of the entire field of view, and adjust the incident angle of each field of view to prevent color cast. The first side surface of the third lens is concave, and the second side surface of the third lens is also concave. The double concave shape of the third lens forms a symmetrical structure with the first and second lenses. At the same time, the optical power is also symmetrical. This structure is beneficial to the balance of chromatic aberration and also has a corrective effect on off-axis astigmatism and coma.

[0051] In the example implementation, the fourth lens has positive optical power, converging light for the first time, effectively reducing the light beam height and decreasing the aperture of the rear lens group, thus achieving miniaturization and low cost. In terms of performance, the positive optical power of the fourth lens effectively controls edge rays, particularly noticeable in correcting coma and field curvature. Optimization of the edge field of view further reduces chromatic aberration, allowing for further performance improvements. The first side of the fourth lens is either convex or concave, matching the front group rays to achieve reverse aberration correction and smooth reception, improving image quality while reducing the sensitivity of the optical lens and increasing yield. The second side of the fourth lens is convex, and this second side is the primary surface for aberrations. The spherical aberration and field curvature contributions required by the optical lens are mainly provided by the second side in the fourth lens.

[0052] In the example implementation, the fifth lens has positive optical power, which further compresses the light, achieving miniaturization of the optical lens. The reintroduction of positive optical power in the fifth lens makes the focal length distribution of the entire optical lens more reasonable, preventing it from concentrating on any single lens element. This reasonable focal length distribution allows the lens to maintain relatively stable performance under high and low temperature conditions. The first side of the fifth lens is convex, ensuring that a large amount of upward-facing light from the fourth lens can be received by the fifth lens, increasing the effective light transmission of the optical lens to a certain extent. The convex first side of the fifth lens also significantly compresses the light, maintaining the miniaturization of the rear aperture of the optical lens. The convex first side of the fifth lens largely corrects the first group spherical aberration, correcting the light entering the image plane. The second side of the fifth lens is either concave or convex, guiding the light to enter the sixth lens at a certain angle, reducing the correction burden on the sixth lens. Simultaneously, the second side of the fifth lens also reduces image quality differences between different fields of view, improving the overall quality of the optical lens.

[0053] In the example embodiment, the sixth lens has negative optical power, providing negative field curvature, etc., to correct residual aberrations of the optical lens. The negative optical power of the sixth lens allows light to be fully corrected before falling into the image, thus significantly improving illumination, resolution, and color cast. The first side of the sixth lens is concave, collecting and converging light rays, and using its surface shape to correct aberrations. The second side of the sixth lens is either convex or concave, adjusting its surface shape to control the light path and angle, making the image clearer and reducing various color cast problems.

[0054] In an example embodiment, the optical lens may further include an aperture stop disposed between the second lens and the third lens. The aperture stop, located between the second and third lenses, facilitates effective light convergence entering the optical lens, reduces the lens aperture at the rear end of the optical lens, and lowers the assembly sensitivity of the optical lens.

[0055] In the example implementation, the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens are all all-glass spherical lenses. The lenses of the first to sixth lenses are made of glass, and through the combination of materials and structure, a heat-free function is achieved.

[0056] In the example embodiment, the second side surface of the third lens and the first side surface of the fourth lens are both spherical with opposite surface shapes. The absolute values ​​of the central curvature radii are close, and the central air gaps on both sides are small, indicating a tendency to bond. The third lens and the fourth lens can be bonded together as a composite.

[0057] In an example embodiment, the optical lens may further include an infrared cut-off filter (IR) located between the sixth lens and the image plane to filter light of different wavelengths. The optical lens may also, as needed, have a cover glass (CG) between the filter and the image plane to prevent damage to internal components (e.g., chips) of the optical lens.

[0058] In an example 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 charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS).

[0059] In the example implementation, the total optical length (TTL) of the optical lens satisfies: 27 ≤ TTL / 1mm ≤ 35. Preferably, 29.0038 ≤ TTL / 1mm ≤ 34.0024. Controlling the TTL range allows the optical lens sufficient space to arrange six global surface glass lenses, enabling precise correction of field curvature, chromatic aberration, and distortion, achieving high MTF at long distances. When the TTL is excessively compressed, it leads to crowded lens arrangement, difficulty in allocating positive and negative optical power, poor far-field edge resolution, and large errors in the telephoto distance calculation of the optical lens.

[0060] In the example implementation, the maximum field of view (DFOV) of the optical lens satisfies: 25 ≤ DFOV / 1° ≤ 45. Preferably, 28.6371 ≤ DFOV / 1° ≤ 40.3334. The DFOV can be the maximum field of view when paired with an imaging chip with a diagonal size of 9.25mm. Controlling the range of DFOV ensures that the optical lens has sufficient lateral field of view to avoid blind spots such as curves, merging points, and road signs, while also preventing ranging errors, distortion, and edge dimming caused by an excessively large field of view.

[0061] In the example implementation, the maximum field of view (DFOV) of the optical lens, the focal length F of the entire optical lens group, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 52 ≤ (DFOV × F) / H / 1° ≤ 65. Preferably, 56.838 ≤ (DFOV × F) / H / 1° ≤ 59.044. Controlling the range of this relationship allows the optical lens to possess telephoto and large target surface characteristics, realizing the telephoto function of the lens and eight million or even ten million pixels.

[0062] In the example implementation, the total optical length (TTL) of the optical lens and the focal length (F) of the entire optical lens assembly satisfy: 1.5 ≤ TTL / F ≤ 2.7. Preferably, 1.777 ≤ TTL / F ≤ 2.455. By controlling the range of this relationship, the total optical length and focal length of the optical lens are balanced, achieving the required telephoto and miniaturized characteristics of the optical lens.

[0063] In the example implementation, the total optical length (TTL) of the optical lens, the image height (H) corresponding to the maximum field of view of the optical lens, and the radian value (θ) of the maximum field of view of the optical lens satisfy: 4.7 ≤ TTL / H / θ × 1 rad ≤ 7.4. Preferably, 5.013 ≤ TTL / H / θ × 1 rad ≤ 7.061. Controlling the range of this relationship allows the optical lens to balance miniaturization and large-area imaging, meeting the application scenarios of eight million or even ten million pixels.

[0064] In the example implementation, the total optical length (TTL) of the optical lens and the maximum value (DMAX) of the maximum aperture of each lens corresponding to the maximum field of view of the optical lens satisfy the following condition: 2.3 ≤ TTL / DMAX ≤ 3.2. Preferably, 2.5 ≤ TTL / DMAX ≤ 2.931. By controlling the range of this relationship and keeping the ratio of the total optical length to the maximum lens aperture small, the entire optical lens can be made more compact and smaller.

[0065] In the example embodiment, the focal length F of the entire optical lens assembly, the radian value θ of the maximum field of view of the optical lens, and the maximum aperture D11 of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy: 0.65 ≤ (F×θ) / D11 / 1rad ≤ 0.9. Preferably, 0.791 ≤ (F×θ) / D11 / 1rad ≤ 0.822. By controlling the range of this relationship, when the maximum field of view of the optical lens is constant, a smaller maximum aperture of the optical lens can result in a smaller front aperture of the optical lens, thereby reducing the imaging volume of the optical lens.

[0066] In the example embodiment, the maximum aperture D11 of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the maximum field of view DFOV of the optical lens satisfy the following condition: 0.025 ≤ D11 / H / DFOV × 1° ≤ 0.055. Preferably, 0.031 ≤ D11 / H / DFOV × 1° ≤ 0.044. By controlling the range of this relationship, the optical lens can achieve miniaturization and a large target surface, realizing eight million or even ten million pixels.

[0067] In the example embodiment, the maximum aperture D11 of the first side of the first lens corresponding to the maximum field of view of the optical lens, the image height H corresponding to the maximum field of view of the optical lens, and the focal length F of the entire optical lens assembly satisfy: 0.06≤D11 / H / F×1mm≤0.12. Preferably, 0.068≤D11 / H / F×1mm≤0.094. Controlling the range of this relationship allows the optical lens to possess miniaturization, telephoto, and large aperture characteristics, realizing the telephoto function and high pixel count required for optical lens applications.

[0068] In the example embodiment, the image height H corresponding to the maximum field of view of the optical lens, the focal length F of the entire optical lens group, and the radian value θ of the maximum field of view of the optical lens satisfy: 0 < |(HF×θ) / (F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.045. Preferably, 0≤|(HF×θ) / (F×θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.03. Controlling the range of this relationship results in a high angular refractive index in the central region of the optical lens, which is beneficial to improving the imaging effect in the central region.

[0069] In the example implementation, the optical back focal length (BFL) and the total optical length (TTL) of the optical lens satisfy the following condition: 0.07 ≤ BFL / TTL ≤ 0.15. Preferably, 0.074 ≤ BFL / TTL ≤ 0.138. By controlling the range of this relationship, while satisfying miniaturization, a certain amount of space is left for the back end to achieve low sensitivity.

[0070] In the example implementation, the focal length F of the entire optical lens assembly and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: 1.25 ≤ F / H ≤ 2.25. Preferably, 1.438 ≤ F / H ≤ 1.986. By controlling the range of this relationship, the optical lens possesses telephoto and large-area characteristics, enabling the optical lens to achieve telephoto functionality and eight million or even ten million pixels.

[0071] In the example embodiment, the focal length F of the entire optical lens assembly and the entrance pupil diameter ENPD of the optical lens satisfy the following condition: 1.35 ≤ F / ENPD ≤ 1.8. Preferably, 1.4 ≤ F / ENPD ≤ 1.7. By controlling the range of this relationship, the optical lens can have a larger aperture, enabling it to adapt to low-light environments during use.

[0072] In the example embodiment, the focal length F of the entire optical lens assembly, the entrance pupil diameter ENPD of the optical lens, and the maximum aperture D11 of the first side of the first lens corresponding to the maximum field of view of the optical lens satisfy: 0.1 ≤ F / ENPD / D11 × 1mm ≤ 0.16. Preferably, 0.121 ≤ F / ENPD / D11 × 1mm ≤ 0.147. By controlling the range of this relationship, the optical lens can obtain a larger aperture while ensuring a smaller front aperture.

[0073] In the example implementation, the effective aperture diameter DST and the total focal length F of the optical lens satisfy the following condition: 0.4 ≤ DST / F ≤ 0.7. Preferably, 0.479 ≤ DST / F ≤ 0.603. By controlling the range of this relationship, a larger ratio of aperture diameter to total focal length results in a larger aperture number for the optical lens.

[0074] In the example embodiment, the image height H corresponding to the maximum field of view of the optical lens, the focal length F of the entire optical lens group, and the radian value θ of the maximum field of view of the optical lens satisfy: 0.9 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 1.1. Preferably, 0.941 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 0.986. By controlling the range of this relationship, the edge distortion of the optical lens is small, resulting in a large angular resolution for each field of view and good resolving capability for each field of view.

[0075] In the example embodiment, the focal length F of the entire optical lens group and the focal length F1 of the first lens satisfy: -0.42 ≤ F / F1 ≤ -0.1. Preferably, -0.4 ≤ F / F1 ≤ -0.157. By controlling the range of this relationship, the first lens can share the burden of the rear lens group, and the first lens can guide more light into the optical lens, which is beneficial for telephoto lenses and high light transmission, and improves the relative illumination of the optical lens.

[0076] In the example embodiment, the focal length F5 of the fifth lens and the focal length F of the entire optical lens assembly satisfy: 1.3 ≤ F5 / F ≤ 1.75. Preferably, 1.35 ≤ F5 / F ≤ 1.47. Controlling the range of this relationship is beneficial for further converging and compressing light to prevent the rear aperture and the total length of the optical lens from being too large, and it also allows for the correction of field curvature caused by the front negative film, which is conducive to the miniaturization and high resolution of the optical lens.

[0077] In the example embodiment, the central radius of curvature R11 of the first side surface of the first lens, the central thickness CT1 of the first lens, and the central radius of curvature R12 of the second side surface of the first lens satisfy: 0.75 ≤ R11 / (CT1+R12) ≤ 1.8. Preferably, 0.977 ≤ R11 / (CT1+R12) ≤ 1.688. Controlling the range of this relationship allows the first lens to effectively control the convergence and divergence angles of large-angle light rays, playing a key role in the telephoto capabilities of optical lenses and the reduction of ghosting.

[0078] In the example implementation, the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy: 0.75 ≤ CT4 / CT5 ≤ 1.6. Preferably, 0.871 ≤ CT4 / CT5 ≤ 1.401. By controlling the range of this relationship, the center thicknesses of adjacent positive fourth and fifth lenses are kept close, eliminating the need to concentrate all positive optical power on a single lens. Furthermore, when the temperature changes, the lens expansion and curvature deformation trends of the fourth and fifth lenses are synchronized, which is beneficial for imaging stability under temperature variations.

[0079] In the example implementation, the focal length F2 of the second lens satisfies the following relationship with the overall focal length F of the optical lens assembly: 0.6 ≤ F2 / F ≤ 1.5. Preferably, 0.785 ≤ F2 / F ≤ 1.255. To control this relationship, a positive second lens with a smaller focal length is immediately following the negative first lens. If the optical power of the second lens is weak, the light beam diverging from the first lens cannot be quickly recovered, resulting in larger outer diameters for subsequent components such as the aperture stop, third lens, and fourth lens, leading to an increase in the overall optical length, size, and cost of the optical lens. At the same time, the positive second lens allows light to be compressed and smoothly enter the rear, which is beneficial for filling the entrance pupil and achieving a small aperture number (F-number, FNO).

[0080] In the example implementation, the focal length F3 of the third lens and the focal length F of the entire optical lens assembly satisfy: -0.85 ≤ F3 / F ≤ -0.4. Preferably, -0.735 ≤ F3 / F ≤ -0.535. By controlling the range of this relationship, the negative third lens has a large refractive power, which can prevent the light passing through the second lens from being excessively compressed. The diffused light not only matches the large imaging target surface of the high-pixel lens, but also facilitates beam splitting, reduces the coupling between different fields of view, and ensures the cleanliness of the image.

[0081] In the example implementation, the focal length F4 of the fourth lens satisfies the following relationship with the focal length F of the entire optical lens group: 0.5 ≤ F4 / F ≤ 1.5. Preferably, 0.693 ≤ F4 / F ≤ 1.331. By controlling the range of this relationship, the positive focal length of the fourth lens is relatively small, which can effectively correct coma, field curvature, and chromatic aberration caused by the front negative film, thereby improving the overall image quality.

[0082] In the example implementation, the focal length F6 of the sixth lens and the focal length F of the entire optical lens assembly satisfy: -1.45 ≤ F6 / F ≤ 0.75. Preferably, -1.257 ≤ F6 / F ≤ -0.935. Controlling the range of this relationship helps the sixth lens adjust the angle of light incident on the image plane, moderately reduce the beam convergence angle, avoid excessive convergence of light at the end inducing advanced off-axis astigmatism, improve the MTF performance of the edge field of view, and also regulate the distortion of the edge field of view, resulting in a higher average angular resolution for each field of view.

[0083] In the example embodiment, the sagitta SAG42 of the second side of the fourth lens corresponding to the maximum field of view of the optical lens and the sagitta SAG51 of the first side of the fifth lens corresponding to the maximum field of view of the optical lens satisfy: -1.3 ≤ SAG42 / SAG51 ≤ -0.6. Preferably, -1.097 ≤ SAG42 / SAG51 ≤ -0.794. A schematic diagram of SAG42 and SAG51 is shown below. Figure 18 As shown. It should be noted that when the sagitta is along the optical axis of the lens from the first side to the second side, the sagitta value is positive; if it is in the opposite direction, it is negative. Controlling the range of this relationship can balance the degree of deflection of the central and peripheral rays, avoiding excessive bending of the peripheral rays and preventing the generation of advanced spherical aberration and coma. When the sagitta directions are opposite (i.e., the values ​​of SAG42 and SAG51 have opposite signs), the light rays are converged at two deflection angles that are close to each other, which helps to reduce sensitivity and improve imaging stability.

[0084] In the example embodiment, the central radius of curvature R42 of the second side of the fourth lens satisfies the following relationship with the focal length F of the entire optical lens assembly: -1.2 ≤ R42 / F ≤ -0.65. Preferably, -0.933 ≤ R42 / F ≤ -0.748. By controlling the range of this relationship, the light rays emitted through the third lens are compressed, and aberrations and field curvature caused by the concave surface in front are corrected. This also avoids light energy loss and improves the illumination of the optical lens.

[0085] In the example embodiment, the single-sided focal length FR51 of the first side of the fifth lens and the overall focal length F of the optical lens assembly satisfy: 1.6 ≤ FR51 / F ≤ 3. Preferably, 1.845 ≤ FR51 / F ≤ 2.616. FR51 refers to the single-sided focal length of the first side of the fifth lens on the glass medium side when light enters from air into the glass medium. By controlling the range of this relationship, the positive focal length of the first side of the fifth lens is relatively small, effectively compressing the light, avoiding excessively large apertures and overall optical lengths of subsequent components, and facilitating the smooth entry of compressed light into the rear, reducing light efficiency loss and improving illumination.

[0086] In the example implementation, the maximum center thickness CTmax and the minimum center thickness CTmin of the third to fifth lenses satisfy: 1 ​​≤ CTmax / CTmin ≤ 2. Preferably, 1.144 ≤ CTmax / CTmin ≤ 1.901. Controlling the range of this relationship ensures that the center thicknesses of the third, fourth, and fifth lenses are relatively close, which is beneficial for more coordinated optical power drift of the third, fourth, and fifth lenses during temperature changes, suppressing focus drift and image quality degradation under high and low temperature environments, and improving the imaging stability of the optical lens in the range of -40℃ to +125℃.

[0087] In the example implementation, the central radius of curvature R61 of the first side of the sixth lens and the air gap T56 between the fifth and sixth lenses satisfy: -3.8 ≤ R61 / T56 ≤ -0.95. Preferably, -3.222 ≤ R61 / T56 ≤ -1.157. By controlling the range of this relationship, a larger T56 results in a more concave curvature of the first side of the sixth lens. This not only allows the light rays corrected by the fifth lens to travel a longer optical path, reducing the degree of light coupling between different fields of view and improving the overall image clarity, but also allows the first side of the sixth lens to fully adjust the transverse chromatic aberration, improving the resolving power of the optical lens.

[0088] In the example embodiment, the center thickness CT1 and the edge thickness ET1 of the first lens satisfy: 0.85 ≤ ET1 / CT1 ≤ 1.4. Preferably, 0.941 ≤ ET1 / CT1 ≤ 1.272. A schematic diagram of ET1 and CT1 is shown below. Figure 19 As shown. By controlling the range of this relationship, the center thickness and edge thickness of the first lens are close, which regulates the optical path difference of the rays in each field of view of the object side. The rays in each field of view can exit smoothly from the first lens, avoiding the introduction of excessive aberrations at the source.

[0089] In the example implementation, the center thickness CT6 of the sixth lens and the focal length F of the entire optical lens assembly satisfy the following condition: 0.035 ≤ CT6 / F ≤ 0.125. Preferably, 0.044 ≤ CT6 / F ≤ 0.105. By controlling the range of this relationship, the center thickness of the sixth lens is relatively thin. While ensuring the imaging quality of each field of view, the center thickness of the sixth lens reduces light absorption, weakens temperature-induced aberration disturbances, and optimizes the rear axial spatial layout, thereby achieving miniaturization of the optical lens, which is suitable for automotive imaging applications.

[0090] In the example embodiment, the central radius of curvature R11 of the first side surface of the first lens and the focal length F of the entire optical lens assembly satisfy: 0.4 ≤ R11 / F ≤ 1.65. Preferably, 0.675 ≤ R11 / F ≤ 1.309. By controlling the range of this relationship, although the first lens is a negative lens, its first side surface is a relatively curved convex surface, which can quickly perform divergence shaping on the incident parallel beam, efficiently control the beam height entering the optical lens, provide a basic beam shape for the optical path layout of the subsequent lens group, and facilitate the control of the outer diameter of subsequent lenses.

[0091] In the example embodiment, the central radius of curvature R12 of the second side surface of the first lens, the air gap T12 between the first and second lenses, and the central radius of curvature R21 of the first side surface of the second lens satisfy: 0.7 ≤ (R12 + T12) / R21 ≤ 1.2. Preferably, 0.866 ≤ (R12 + T12) / R21 ≤ 0.99. By controlling the range of this relationship, the deflection of light rays when they exit from the first lens and enter the second lens is small, reducing the sensitivity of the light and minimizing aberrations introduced by the light source.

[0092] In the example embodiment, the central radius of curvature R31 of the first side surface of the third lens and the central radius of curvature R32 of the second side surface of the third lens satisfy: -1.5 ≤ R31 / R32 ≤ -0.35. Preferably, -1.21 ≤ R31 / R32 ≤ -0.512. By controlling the range of this relationship, the values ​​of the radii of curvature on both sides of the biconcave negative plate of the third lens are such that the surface shapes on both sides are similar. Light rays are effectively diverged twice at this point. Because the light path is reversible, the light rays in front fill the entrance pupil, which is beneficial for achieving a small FNO.

[0093] In the example implementation, the optical lens satisfies the following conditions: -0.42≤F / F1≤-0.1, 0.6≤F2 / F≤1.5, -0.85≤F3 / F≤-0.4, 0.5≤F4 / F≤1.5, 1.3≤F5 / F≤1.75, and -1.45≤F6 / F≤0.75. By controlling the range of these relationships, the first lens diverges the incident beam with negative power, the second lens refocuses and converges it with positive power, forming a negative-positive telephoto front group. The third and fourth lenses again form a "negative-positive" ratio, creating a transition lens group. The fifth lens precisely controls and compresses the light, and the sixth lens can flexibly act as a balancing element. Furthermore, the first-second and third-fourth lenses form a dual-stage negative-positive lens group, which is beneficial for telephoto shooting, and the fourth and fifth lenses form a continuous dual-positive configuration. These joint constraints simultaneously achieve the requirements of spherical aberration balance, chromatic aberration control, distortion suppression, 8-megapixel high resolution, and miniaturization. Under the constraint of an all-glass spherical surface, the above-mentioned collaborative architecture achieves joint correction of multiple aberrations solely through the focal length ratio of the spherical lenses.

[0094] 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, the optical lens achieves small aperture, miniaturization, high resolution, low sensitivity, large angular resolution, large field of view, long back focal length, low distortion, small principal angle, high illumination, and good manufacturability. It can also be well-matched to, for example, automotive chips without producing vignetting. This optical lens exhibits excellent temperature performance, with minimal changes in imaging effect at high and low temperatures, and stable image quality. Therefore, the optical lens according to the above embodiments of this application can better meet the requirements of, for example, automotive applications.

[0095] Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0096] Example 1 The following is for reference Figure 1 Describes an optical lens according to Embodiment 1 of this application. For example... 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 second lens L2 and the third lens L3.

[0097] The first lens L1 has negative optical power, its first side surface S1 is convex, and its second side surface S2 is concave.

[0098] The second lens L2 has positive optical power, with its first side surface S3 being convex and its second side surface S4 being concave.

[0099] The third lens L3 has negative optical power, and its first side surface S5 is concave, and its second side surface S6 is concave.

[0100] The fourth lens L4 has positive optical power, and its first side surface S7 is convex, and its second side surface S8 is convex.

[0101] The fifth lens L5 has positive optical power, with its first side surface S9 being convex and its second side surface S10 being concave.

[0102] The sixth lens L6 has negative optical power, with its first side surface S11 being concave and its second side surface S12 being convex.

[0103] 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. A protective glass L7 is provided between the sixth lens L6 and the image plane IMA. The protective glass L7 has a first side surface S13 and a second side surface S14. Table 1 shows the basic parameters of the optical lens of Embodiment 1.

[0104] Table 1. Basic parameters of the optical lens in Example 1

[0105] Figure 15 In this context, T represents the meridian / tangential direction. From Figure 15 As can be seen, the optical lens of Example 1 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the 17.19° edge field of view at a spatial frequency of 119 lp / mm. It has good resolution quality in each field of view and achieves high imaging quality of eight million or even ten million pixels. Figure 16 The example illustrates the distortion values ​​of 436nm wavelength light under different fields of view of the optical lens of Example 1. Figure 16 The black dashed line in the middle represents the baseline where the distortion value is 0. From... Figure 16 As can be seen, the optical lens of Example 1 has less distortion at the edge of the field of view, which is beneficial to having a large angular resolution in each field of view and high imaging quality in each field of view. Figure 17 The example illustrates the relative illumination of the optical lens of Embodiment 1 in the Y-direction field of view. The Y-direction is the Y-axis direction of the optical lens's X, Y, and Z axes. From Figure 17 As can be seen, the optical lens of Example 1 can achieve a relative illumination of over 60% (i.e., 0.6) at the edge field of view, exhibiting strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 1 has good imaging quality.

[0106] Example 2 The following is for reference Figure 2 Describes an optical lens according to Embodiment 2 of this application. For example... Figure 2 As shown, the main differences between this embodiment and Embodiment 1 are: the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different; and the second side surface S4 of the second lens L2 is convex; the second side surface S10 of the fifth lens L5 is convex. Table 2 shows the basic parameters of the optical lens of Embodiment 2.

[0107] Table 2 Basic parameters of the optical lens in Example 2

[0108] The optical lens of Example 2 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 2 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens in Example 2 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 2 possesses superior imaging quality.

[0109] Example 3 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 differences between this embodiment and Embodiment 1 are: the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different; the second side surface S4 of the second lens L2 is convex; the first side surface S7 of the fourth lens L4 is concave; and the second side surface S10 of the fifth lens L5 is convex. Table 3 shows the basic parameters of the optical lens of Embodiment 3.

[0110] Table 3. Basic parameters of the optical lens in Example 3

[0111] The optical lens of Example 3 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 3 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens in Example 3 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 3 possesses excellent imaging quality.

[0112] Example 4 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 differences between this embodiment and Embodiment 1 are: the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different; and the second side surface S10 of the fifth lens L5 is a convex surface. Table 4 shows the basic parameters of the optical lens of Embodiment 4.

[0113] Table 4. Basic parameters of the optical lens in Example 4

[0114] The optical lens of Example 4 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 4 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens in Example 4 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 4 possesses excellent imaging quality.

[0115] Example 5 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 differences between this embodiment and Embodiment 1 are: the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different; the second side surface S4 of the second lens L2 is convex; the second side surface S10 of the fifth lens L5 is convex; and the second side surface S12 of the sixth lens L6 is concave. Table 5 shows the basic parameters of the optical lens of Embodiment 5.

[0116] Table 5. Basic parameters of the optical lens in Example 5

[0117] The optical lens of Example 5 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 5 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens in Example 5 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 5 possesses excellent imaging quality.

[0118] Example 6 The following is for reference Figure 6 Describes an optical lens according to Embodiment 6 of this application. For example... Figure 6As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. Table 6 shows the basic parameters of the optical lens of Embodiment 6.

[0119] Table 6 Basic parameters of the optical lens in Example 6

[0120] The optical lens of Example 6 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 6 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens in Example 6 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 6 possesses excellent imaging quality.

[0121] Example 7 The following is for reference Figure 7 Describes an optical lens according to Embodiment 7 of this application. For example... Figure 7 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. Table 7 shows the basic parameters of the optical lens of Embodiment 7.

[0122] Table 7 Basic parameters of the optical lens in Example 7

[0123] The optical lens of Example 7 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 7 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens in Example 7 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 7 possesses excellent imaging quality.

[0124] Example 8 The following is for reference Figure 8 Describes an optical lens according to Embodiment 8 of this application. For example... Figure 8As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. Table 8 shows the basic parameters of the optical lens of Embodiment 8.

[0125] Table 8 Basic parameters of the optical lens in Example 8

[0126] The optical lens of Example 8 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 8 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens of Example 8 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 8 possesses excellent imaging quality.

[0127] Example 9 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 difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. Table 9 shows the basic parameters of the optical lens of Embodiment 9.

[0128] Table 9. Basic parameters of the optical lens in Example 9

[0129] The optical lens of Example 9 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 9 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens of Example 9 can reach over 60% in the edge field of view, resulting in strong brightness consistency and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 9 possesses excellent imaging quality.

[0130] Example 10 The following is for reference Figure 10 Describes an optical lens according to Embodiment 10 of this application. For example... Figure 10As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. Table 10 shows the basic parameters of the optical lens of Embodiment 10.

[0131] Table 10 Basic parameters of the optical lens in Example 10

[0132] The optical lens of Example 10 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 10 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens of Example 10 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 10 possesses excellent imaging quality.

[0133] Example 11 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 difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. Table 11 shows the basic parameters of the optical lens of Embodiment 11.

[0134] Table 11 Basic parameters of the optical lens in Example 11

[0135] The optical lens of Example 11 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 11 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens of Example 11 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 11 possesses excellent imaging quality.

[0136] Example 12 The following is for reference Figure 12 Describes an optical lens according to Embodiment 12 of this application. For example... Figure 12 As shown, the main difference between this embodiment and Embodiment 1 is that the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different. Table 12 shows the basic parameters of the optical lens of Embodiment 12.

[0137] Table 12 Basic parameters of the optical lens in Example 12

[0138] The optical lens of Example 12 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 12 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens of Example 12 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 12 possesses excellent imaging quality.

[0139] Example 13 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 differences between this embodiment and Embodiment 1 are: the optical parameters such as the central radius of curvature and lens thickness of each lens surface are different; and a filter L8 is provided between the sixth lens L6 and the protective glass L7; the filter L8 has a first side surface S15 and a second side surface S16. Table 13 shows the basic parameters of the optical lens of Embodiment 13.

[0140] Table 13 Basic parameters of the optical lens in Example 13

[0141] The optical lens of Example 13 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 13 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens of Example 13 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 13 possesses excellent imaging quality.

[0142] Example 14 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 central radius of curvature and lens thickness of each lens surface are different. Table 14 shows the basic parameters of the optical lens of Embodiment 14.

[0143] Table 14 Basic parameters of the optical lens in Example 14

[0144] The optical lens of Example 14 achieves a peak MTF of over 0.6 in the 0° center field of view, over 0.4 in the 12.06° field of view, and over 0.2 in the edge field of view at a spatial frequency of 119 lp / mm. This results in good resolution across all fields of view, achieving high imaging quality at the level of eight million or even ten million pixels. The optical lens of Example 14 exhibits less distortion in the edge field of view, which is beneficial for achieving high angular resolution and high imaging quality in all fields of view. Furthermore, the relative illumination of the optical lens of Example 14 can reach over 60% in the edge field of view, resulting in strong brightness uniformity and more uniform and clear imaging across all fields of view. Therefore, the optical lens provided in Example 14 possesses excellent imaging quality.

[0145] Tables 15-1 and 15-2 provide the basic parameters of the optical lenses in Examples 1-14, such as F, ENPD, TTL, DFOV, θ, H, BFL, DST, DMAX, D11, D12, D21, D22, D31, D32, D41, D42, D51, D52, D61, D62, SAG42, SAG51, FR51, ET1, CTmax, and CTmin. Wherein, D12 is the maximum aperture of the second side of the first lens corresponding to the maximum field of view of the optical lens, D21 is the maximum aperture of the first side of the second lens corresponding to the maximum field of view of the optical lens, D22 is the maximum aperture of the second side of the second lens corresponding to the maximum field of view of the optical lens, D31 is the maximum aperture of the first side of the third lens corresponding to the maximum field of view of the optical lens, D32 is the maximum aperture of the second side of the third lens corresponding to the maximum field of view of the optical lens, D41 is the maximum aperture of the first side of the fourth lens corresponding to the maximum field of view of the optical lens, D42 is the maximum aperture of the second side of the fourth lens corresponding to the maximum field of view of the optical lens, D51 is the maximum aperture of the first side of the fifth lens corresponding to the maximum field of view of the optical lens, D52 is the maximum aperture of the second side of the fifth lens corresponding to the maximum field of view of the optical lens, D61 is the maximum aperture of the first side of the sixth lens corresponding to the maximum field of view of the optical lens, and D62 is the maximum aperture of the second side of the sixth lens corresponding to the maximum field of view of the optical lens.

[0146] Table 15-1 Basic parameters of the optical lenses in Examples 1-7

[0147] Table 15-2 Basic parameters of the optical lenses in Examples 8-14

[0148] In summary, the relationships in each embodiment of Examples 1-14 satisfy the relationships shown in Tables 16-1 and 16-2.

[0149] Table 16-1 Relationships in Examples 1-7

[0150] Table 16-2 Relationships in Examples 8-14

[0151] This application also provides an electronic device, including a first device and / or 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.

[0152] 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 has a first side surface that is convex and a second side surface that is concave. A second lens with positive optical power has a convex first side surface; A third lens with negative optical power has a concave first side and a concave second side. The fourth lens has positive optical power, and its second side surface is convex. The fifth lens with positive optical power has a convex first side surface; The sixth lens, which has negative optical power, has a concave first side surface; The optical lens has six lenses with optical power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all all-glass spherical lenses; The optical lens satisfies the following relationships: 1.35≤F / ENPD≤1.8, 1.5≤TTL / F≤2.7, -0.42≤F / F1≤-0.1 and 1.3≤F5 / F≤1.75; Wherein, F is the focal length of the entire optical lens group, ENPD is the entrance pupil diameter of the optical lens, TTL is the total optical length of the optical lens, F1 is the focal length of the first lens, and F5 is the focal length of the fifth lens.

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

3. The optical lens according to any one of claims 1 to 2, characterized in that, The total optical length (TTL) of the optical lens satisfies: 27 ≤ TTL / 1mm ≤ 35.

4. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F of the entire optical lens group and the image height H corresponding to the maximum field of view of the optical lens satisfy the following condition: 1.25≤F / H≤2.

25.

5. The optical lens according to any one of claims 1 to 2, characterized in that, The image height H corresponding to the maximum field of view of the optical lens, the focal length F of the entire optical lens group, and the radian value θ of the maximum field of view of the optical lens satisfy: 0.9≤(H / 2) / (F×tan(θ / 2))≤1.

1.

6. The optical lens according to any one of claims 1 to 2, characterized in that, The central radius of curvature R11 of the first side surface of the first lens, the central thickness CT1 of the first lens, and the central radius of curvature R12 of the second side surface of the first lens satisfy: 0.75≤R11 / (CT1+R12)≤1.

8.

7. The optical lens according to any one of claims 1 to 2, characterized in that, The center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy the condition: 0.75≤CT4 / CT5≤1.

6.

8. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F2 of the second lens satisfies the following condition with the focal length F of the entire optical lens group: 0.6≤F2 / F≤1.

5.

9. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F3 of the third lens satisfies the following condition with the focal length F of the entire optical lens group: -0.85≤F3 / F≤-0.

4.

10. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F4 of the fourth lens satisfies the following condition with respect to the focal length F of the entire optical lens group: 0.5≤F4 / F≤1.

5.

11. The optical lens according to any one of claims 1 to 2, characterized in that, The focal length F6 of the sixth lens satisfies the following condition with the focal length F of the entire optical lens group: -1.45≤F6 / F≤0.

75.

12. The optical lens according to any one of claims 1 to 2, characterized in that, The sag of the second side of the fourth lens corresponding to the maximum field of view of the optical lens, SAG42, and the sag of the first side of the fifth lens corresponding to the maximum field of view of the optical lens, SAG51, satisfy the following condition: -1.3≤SAG42 / SAG51≤-0.

6.

13. The optical lens according to any one of claims 1 to 2, characterized in that, The single-sided focal length FR51 of the first side of the fifth lens and the focal length F of the entire optical lens group satisfy: 1.6≤FR51 / F≤3.

14. The optical lens according to any one of claims 1 to 2, characterized in that, The maximum value CTmax of the center thickness from the third lens to the fifth lens and the minimum value CTmin of the center thickness from the third lens to the fifth lens satisfy: 1≤CTmax / CTmin≤2.

15. The optical lens according to any one of claims 1 to 2, characterized in that, The central curvature radius R61 of the first side of the sixth lens and the air gap T56 between the fifth lens and the sixth lens satisfy the following condition: -3.8≤R61 / T56≤-0.

95.

16. The optical lens according to any one of claims 1 to 2, characterized in that, The center thickness CT1 of the first lens and the edge thickness ET1 of the first lens satisfy the following condition: 0.85≤ET1 / CT1≤1.

4.

17. The optical lens according to any one of claims 1 to 2, characterized in that, The center thickness CT6 of the sixth lens and the focal length F of the entire optical lens group satisfy the following condition: 0.035≤CT6 / F≤0.

125.

18. The optical lens according to any one of claims 1 to 2, characterized in that, The central curvature radius R12 of the second side of the first lens, the air gap T12 between the first lens and the second lens, and the central curvature radius R21 of the first side of the second lens satisfy: 0.7≤(R12+T12) / R21≤1.

2.

19. The optical lens according to any one of claims 1 to 2, characterized in that, The maximum field of view (DFOV) of the optical lens satisfies: 25 ≤ DFOV / 1° ≤ 45.

20. The optical lens according to any one of claims 1 to 2, characterized in that, The optical lens satisfies at least one of the following relationships: 52≤(DFOV×F) / H / 1°≤65, 4.7≤TTL / H / θ×1rad≤7.4, 2.3≤TTL / DMAX≤3.2, 0.65≤(F×θ) / D1 1 / 1rad≤0.9, 0.025≤D11 / H / DFOV×1°≤0.055, 0.06≤D11 / H / F×1mm≤0.12, 0<|(HF×θ) / (F× θ)|×(1mm×1rad) / (1mm-1mm×1rad)≤0.045, 0.07≤BFL / TTL≤0.15, 0.1≤F / ENPD / D11×1mm≤0.16, 0.4≤DST / F≤0.7, -1.2≤R42 / F≤-0.65, 0.4≤R11 / F≤1.65 or -1.5≤R31 / R32≤-0.35; Wherein, DFOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, θ is the radian value of the maximum field of view of the optical lens, DMAX is the maximum value among the maximum apertures of each lens corresponding to the maximum field of view of the optical lens, D11 is the maximum aperture of the first side of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focal length of the optical lens, DST is the effective aperture of the aperture stop, R42 is the central radius of curvature of the second side of the fourth lens, R11 is the central radius of curvature of the first side of the first lens, R31 is the central radius of curvature of the first side of the third lens, and R32 is the central radius of curvature of the second side of the third lens.

21. The optical lens according to any one of claims 1 to 2, characterized in that, The optical lens satisfies at least one of the following relationships: 56.838 ≤ (DFOV × F) / H / 1° ≤ 59.044, 1.777 ≤ TTL / F ≤ 2.455, 5.013 ≤ TTL / H / θ × 1rad ≤ 7.061, 2.5 ≤ TTL / DMAX ≤ 2.931, 0.791 ≤ (F × θ) / D11 / 1rad ≤ 0.822, 0.031 ≤ D11 / H / DFOV × 1° ≤ 0.044, 0.068 ≤ D11 / H / F × 1mm ≤ 0.094, 0 ≤ |(H - F × θ) / (F × θ)| × (1mm × 1rad) / (1mm - 1mm × 1rad) ≤ 0.03, 0.074 ≤ BFL / TTL ≤ 0.138, 1.438 ≤ F / H ≤ 1.986, 1.4 ≤ F / ENPD ≤ 1.7, 0.121 ≤ F / ENPD / D11 × 1mm ≤ 0.147, 0.479 ≤ DST / F ≤ 0.603, 0.941 ≤ (H / 2) / (F × tan(θ / 2)) ≤ 0.986, -0.4 ≤ F / F1 ≤ -0.157, 1.35 ≤ F5 / F ≤ 1.47, 0.977 ≤ R11 / (CT1 + R12) ≤ 1.688, 0.871 ≤ CT4 / CT5 ≤ 1.401, 0.785 ≤ F2 / F ≤ 1.255, -0.735 ≤ F3 / F ≤ -0.535, 0.693 ≤ F4 / F ≤ 1.331, -1.257 ≤ F6 / F ≤ -0.935, -1.097 ≤ SAG42 / SAG51 ≤ -0.794, -0.933 ≤ R42 / F ≤ -0.748, 1.845 ≤ FR51 / F ≤ 2.616, 1.144 ≤ CTmax / CTmin ≤ 1.901, -3.222 ≤ R61 / T56 ≤ -1.157, 0.941 ≤ ET1 / CT1 ≤ 1.272, 0.044 ≤ CT6 / F ≤ 0.105, 0.675 ≤ R11 / F ≤ 1.309, 0.866 ≤ (R12 + T12) / R21 ≤ 0.99, -1.21 ≤ R31 / R32 ≤ -0.512, 29.0038 ≤ TTL / 1mm ≤ 34.0024, or 28.6371 ≤ DFOV / 1° ≤ 40.3334; Wherein, DFOV is the maximum field of view of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, θ is the radian value of the maximum field of view of the optical lens, DMAX is the maximum value among the maximum aperture values ​​of each lens corresponding to the maximum field of view of the optical lens, D11 is the maximum aperture value of the first side of the first lens corresponding to the maximum field of view of the optical lens, BFL is the optical back focal length of the optical lens, DST is the effective aperture of the aperture stop, R11 is the center radius of curvature of the first side of the first lens, CT1 is the center thickness of the first lens, R12 is the center radius of curvature of the second side of the first lens, CT4 is the center thickness of the fourth lens, CT5 is the center thickness of the fifth 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, F6 is the focal length of the sixth lens, and SAG42 is the maximum aperture value of the optical lens corresponding to the maximum field of view of the optical lens. The sag of the second side of the fourth lens, SAG51 is the sag of the first side of the fifth lens corresponding to the maximum field of view of the optical lens, R42 is the central radius of curvature of the second side of the fourth lens, FR51 is the image-side focal length of the first side of the fifth lens, CTmax is the maximum value of the center thickness from the third lens to the fifth lens, CTmin is the minimum value of the center thickness from the third lens to the fifth lens, R61 is the central radius of curvature of the first side of the sixth lens, T56 is the air gap between the fifth lens and the sixth lens, ET1 is the edge thickness of the first lens, CT6 is the center thickness of the sixth lens, T12 is the air gap between the first lens and the second lens, R21 is the central radius of curvature of the first side of the second lens, R31 is the central radius of curvature of the first side of the third lens, and R32 is the central radius of curvature of the second side of the third lens.

22. An electronic device, characterized in that, include: Optical lens according to any one of claims 1 to 21; 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