Optical lens and electronic equipment

Abstract

The utility model discloses an optical lens and electronic equipment. The optical lens comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power. First side surfaces of the first lens and the second lens are convex surfaces, and second side surfaces of the first lens and the second lens are concave surfaces; the first side surface of the third lens is a convex surface; the first side surface and the second side surface of the fourth lens are convex surfaces; the first side surface and the second side surface of the fifth lens are concave surfaces; the first side surface of the sixth lens is a convex surface. The optical lens meets the following conditions: 10 < = TTL / F < = 12.5, 7 < = R52 / F < = 30, FOV > = 180 degrees and T34 / TTL < = 0.02, TTL is the total optical length of the optical lens, F is the total effective focal length of the optical lens, R52 is the radius of curvature of the second side surface of the fifth lens, FOV is the maximum field angle of the optical lens, and T34 is the air interval between the third lens and the fourth lens on the optical axis.

Description

Technical Field

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

[0002] In recent years, car-assisted driving technology has been favored by consumers, and the demand for vehicle-mounted lenses, as key components for obtaining external information, has also been increasing.

[0003] Automotive lenses refer to optical lenses installed in cars to perform various functions, primarily including interior, rear, front, side, and surround-view cameras. High resolution and a wide field of view are the core competitive qualities of surround-view automotive lenses. With the increasing use of high-M-number, large-chip (i.e., high-pixel) chips, the number of lenses has increased to improve overall lens performance and reduce aberrations. This is in stark contrast to the increasing miniaturization of lens length. Furthermore, in assisted driving technology, wide-field-of-view lenses are increasingly favored to better gather information and avoid blind spots. However, high-pixel chips are difficult to match with wide-field-of-view lenses. Furthermore, as an external automotive component, surround-view lenses operate in a harsh and complex environment. High and low temperature fluctuations significantly impact lens performance. Furthermore, the sun and oncoming vehicle lights can easily enhance ghosting, resulting in a poor user experience. Furthermore, existing module technology lacks autofocus. Consequently, existing automotive lenses suffer from numerous issues, including poor temperature performance, strong ghosting, and significant distortion. Utility Model Content

[0004] In a first aspect, the present application provides an optical lens, which includes, in order from a first side to a second side along an optical axis: a first lens having negative optical power, a second lens having negative optical power, a third lens having positive optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, and a sixth lens having positive optical power. The first side surfaces of the first lens and the second lens are both convex, and the second side surfaces are both concave; the first side surface of the third lens is convex; the first side surface and the second side surface of the fourth lens are both convex; the first side surface and the second side surface of the fifth lens are both concave; and the first side surface of the sixth lens is convex. The total optical length TTL of the optical lens and the total effective focal length F of the optical lens satisfy: 10≤TTL / F≤12.5; the radius of curvature R52 of the second side surface of the fifth lens and the total effective focal length F of the optical lens satisfy: 7≤R52 / F≤30; the maximum field of view FOV of the optical lens satisfies: FOV≥180°; the air gap T34 between the third lens and the fourth lens on the optical axis and the total optical length TTL of the optical lens satisfy: T34 / TTL≤0.02.

[0005] In one embodiment, the air interval T56 between the fifth lens and the sixth lens on the optical axis and the total optical length TTL of the optical lens satisfy the following relationship: 0.02≤T56 / TTL≤0.05.

[0006] In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F5 of the fifth lens satisfy: 0.75≤|F4 / F5|≤1.2.

[0007] In one embodiment, the effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy: 2≤F3 / F≤4.5.

[0008] In one embodiment, the effective focal length F2 of the second lens and the total effective focal length F of the optical lens satisfy: -2.5≤F2 / F≤-1.6.

[0009] In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: -5.5≤F1 / F≤-3.

[0010] In one embodiment, the effective focal length F2 of the second lens and the effective focal length F3 of the third lens satisfy: -0.9≤F2 / F3≤-0.4.

[0011] In one embodiment, the curvature radius R11 of the first side surface of the first lens and the total effective focal length F of the optical lens satisfy: 7.5≤R11 / F≤10.

[0012] In one embodiment, the maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: 40°≤(FOV×F) / H≤50°.

[0013] In one embodiment, the curvature radius R21 of the first side surface of the second lens and the total optical length TTL of the optical lens satisfy: 0.2≤R21 / TTL≤1.5.

[0014] In one embodiment, the sum of the center thicknesses CT45 of the fourth lens and the fifth lens on the optical axis and the total optical length TTL of the optical lens satisfy the following relationship: 0.12≤CT45 / TTL≤0.2.

[0015] In one embodiment, the combined focal length F45 of the fourth lens and the fifth lens and the total effective focal length F of the optical lens satisfy the following relationship: 3.5≤F45 / F≤14.

[0016] In one embodiment, a center thickness CT4 of the fourth lens on the optical axis and a center thickness CT5 of the fifth lens on the optical axis satisfy: 2.3≤CT4 / CT5≤4.5.

[0017] In one embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy: -5.3≤F1 / F≤-3.

[0018] In one embodiment, the sum of the air intervals ΣT between any two adjacent lenses on the optical axis from the first lens to the sixth lens and the total optical length TTL of the optical lens satisfy: 0.24≤ΣT / TTL≤0.32.

[0019] In one embodiment, the optical lens satisfies at least one of the following conditions: 0.01≤TTL / H / FOV×1°≤0.02, 0.008≤D / H / FOV×1°≤0.02, 1.3mm -1 ≤D / H / F≤2.2mm -1 , where TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, D is the maximum clear aperture of the first side of the first lens, and F is the total effective focal length of the optical lens.

[0020] In one embodiment, the curvature radius R31 of the first side surface of the third lens and the total optical length TTL of the optical lens meet the following relationship: 0.15≤R31 / TTL≤0.5.

[0021] In one embodiment, the optical lens satisfies at least one of the following conditions: 0.1 ≤ BFL / TTL ≤ 0.2, 7.5 ≤ R11 / F ≤ 10.5, 3.5 ≤ R21 / R22 ≤ 16, 0.015 ≤ T56 / TTL ≤ 0.05, 0.780 ≤ D12 / H ≤ 0.900, 0.03 ≤ R41 / R52 ≤ 0.25, T34 / TTL ≤ 0.015, and -2.3 ≤ F2 / F ≤ -1. 8, -5.3≤F1 / F≤-3.2, 1.5≤F6 / F≤4, 8≤R52 / F≤28, 3≤R21 / R22≤20, 0.18≤R31 / TTL≤0.48, 2.6≤CT4 / CT5≤4.3, 180°≤FOV≤220°, where BFL is the optical back focus of the optical lens, TTL is the total optical length of the optical lens, D is the maximum clear aperture of the first side of the first lens, H is the maximum clear aperture of the first side of the first lens, is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, F is the total effective focal length of the optical lens, R11 is the radius of curvature of the first side surface of the first lens, R21 is the radius of curvature of the first side surface of the second lens, R22 is the radius of curvature of the second side surface of the second lens, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, D12 is the maximum clear aperture of the second side surface of the sixth lens, R41 is the radius of curvature of the first side surface of the fourth lens, R52 is the radius of curvature of the second side surface of the fifth lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F6 is the effective focal length of the sixth lens, R31 is the radius of curvature of the first side surface of the third lens, CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0022] In one embodiment, the second side surface of the third lens is a convex surface or a concave surface.

[0023] In one embodiment, the second side surface of the sixth lens is a convex surface or a concave surface.

[0024] In one embodiment, the optical lens satisfies at least one of the following: 0.005≤T34 / TTL≤0.011, 10.5≤TTL / F≤12.2, 0.8≤|F4 / F5|≤1.1, 2.5≤F3 / F≤4, -2.2≤F2 / F≤-1.9, -5≤F1 / F≤-3.5, 11≤R52 / F≤26, 0.13≤BFL / TTL≤0.16, 0.010≤D / H / FOV×1°≤0.014, 1.4 mm -1 ≤D / H / F≤2mm -1, -0.8≤F2 / F3≤-0.5, 8≤R11 / F≤10, 43°≤(FOV×F) / H≤48°, 4.5≤R21 / R22≤14.5, 0.02≤T56 / TTL≤0.04, 0.3≤R21 / TTL≤1.3, 0.14≤CT45 / TTL≤0.18, 0.810≤D12 / H≤0.869, 5.5≤F45 / F≤12.2, 0.08≤R41 / R52≤0.21, 0.24≤R31 / TTL≤0.43, 2≤F6 / F≤3, 2.8≤CT4 / CT5≤4, 0.26≤ΣT / TTL≤0.3, 0.011≤TTL / H / FOV×1°≤0.016, 200°≤FOV≤205.4°, where T34 is the air distance between the third lens and the fourth lens on the optical axis, TTL is the total optical length of the optical lens, F is the total effective focal length of the optical lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F3 is the effective focal length of the third lens, F2 is the effective focal length of the second lens, and F1 is the effective focal length of the first lens. R52 is the curvature radius of the second side surface of the fifth lens, BFL is the optical back focus of the optical lens, D is the maximum clear aperture of the first side surface of the first lens, H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, R11 is the curvature radius of the first side surface of the first lens, FOV is the maximum field of view of the optical lens, R21 is the curvature radius of the first side surface of the second lens, R22 is the curvature radius of the second side surface of the second lens, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, CT45 is the distance between the fourth lens and the sixth lens on the optical axis, where D12 is the sum of the center thicknesses of the sixth lens and the fifth lens on the optical axis, D41 is the radius of curvature of the first side of the fourth lens, R52 is the radius of curvature of the second side of the fifth lens, R31 is the radius of curvature of the first side of the third lens, F6 is the effective focal length of the sixth lens, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, and ΣT is the sum of the air gaps between any two adjacent lenses from the first to the sixth lens on the optical axis.

[0025] A second aspect of the present application provides an electronic device comprising the optical lens provided by the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0026] The optical lens provided by the present application utilizes six lenses, with the shapes and optical powers of each lens being rationally configured. The first, second, and fifth lenses have negative optical powers, while the third, fourth, and sixth lenses have positive optical powers. The first side surfaces of the first and second lenses are both convex, and the second side surfaces are both concave. The first side surface of the third lens is convex; the first and second side surfaces of the fourth lens are both convex; the first and second side surfaces of the fifth lens are both concave; and the first side surface of the sixth lens is convex. Furthermore, the following conditions are met: 10≤TTL / F≤12.5, 7≤R52 / F≤30, FOV≥180°, and T34 / TTL≤0.02. This lens has the advantages of a large field of view and compactness. Furthermore, the second side surface of the fifth lens is configured so that the paraxial region is concave, which can rationally adjust the divergence angle of light, facilitates the light to reach a reasonable image height, and reduces edge distortion while shortening the TTL. Furthermore, the rationally designed spacing between the third and fourth lenses facilitates overall compactness and reduces the pressure of light converging on the first side surface of the fourth lens, resulting in smooth light convergence and improved resolution. In particular, the present invention can be used as a wide-angle optical lens in vehicle-mounted surround view systems with a field of view exceeding 180°. The optical lens provided by the present invention has at least one of the following advantages: miniaturization, large field of view, low sensitivity, high luminous flux, high resolution, excellent temperature performance, low ghosting, and minimal distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present application will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0028] Figure 1 1 shows a schematic structural diagram of an optical lens according to Example 1 of the present application;

[0029] Figure 2 shows a modulation transfer function curve of the central field of view of the optical lens according to Example 1 of the present application;

[0030] Figure 3 1 shows a schematic structural diagram of an optical lens according to Example 2 of the present application;

[0031] Figure 4 shows a modulation transfer function curve of the central field of view of the optical lens according to Example 2 of the present application;

[0032] Figure 5 1 shows a schematic structural diagram of an optical lens according to Example 3 of the present application;

[0033] Figure 6 shows a modulation transfer function curve of the central field of view of the optical lens according to Example 3 of the present application;

[0034] Figure 71 shows a schematic structural diagram of an optical lens according to Example 4 of the present application;

[0035] Figure 8 shows a modulation transfer function curve of the central field of view of the optical lens according to Example 4 of the present application;

[0036] Figure 9 1 shows a schematic structural diagram of an optical lens according to Example 5 of the present application;

[0037] Figure 10 shows a modulation transfer function curve of the central field of view of the optical lens according to Example 5 of the present application;

[0038] Figure 11 1 shows a schematic structural diagram of an optical lens according to Example 6 of the present application;

[0039] Figure 12 shows a modulation transfer function curve of the central field of view of the optical lens according to Example 6 of the present application;

[0040] Figure 13 1 shows a schematic structural diagram of an optical lens according to Example 7 of the present application;

[0041] Figure 14 shows a modulation transfer function curve of the central field of view of the optical lens according to Example 7 of the present application;

[0042] Figure 15 1 shows a schematic structural diagram of an optical lens according to Example 8 of the present application;

[0043] Figure 16 The figure shows the modulation transfer function curve of the central field of view of the optical lens according to Example 8 of the present application. DETAILED DESCRIPTION

[0044] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0045] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0046] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0047] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface type in the paraxial region can be judged according to the general method in the art, for example, the positive and negative R value (R refers to the curvature radius of the paraxial region) is used to judge the convexity. Exemplarily, when the optical lens provided in the present application is used for photography, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens. In terms of the object side, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; in terms of the image side, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0048] It should be understood that the optical lens provided in this application can be used for both video recording and projection, and can also be used for laser radar lenses. When the optical lens provided in this application is used for a camera lens or a laser radar receiving end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the image side. The light from the object side can, for example, be imaged on the image side, wherein the camera lens can be, for example, a car camera, an infrared camera, a drone camera, a night vision camera, a security monitoring camera, etc.; when the optical lens provided in this application is used for a projection lens or a radar transmitting end lens, the "first side" referred to in this article may refer to the object side, and the "second side" may refer to the image source side or the light source side. The light from the image source side or the light source side passes through the optical lens and is projected to the first side, for example, forming an image or illuminating an area on the first side.

[0049] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0050] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0051] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] The features, principles and other aspects of the present application are described in detail below.

[0053] In an exemplary embodiment, the optical lens includes, for example, six lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are sequentially arranged along the optical axis from the first side to the second side.

[0054] In an exemplary embodiment, the optical lens provided in the present application can be used as, for example, a vehicle-mounted lens or a laser radar receiving end 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, for example. The second side of the optical lens can be provided with an imaging surface of the optical lens. In this case, the total optical length TTL of the optical lens is the distance from the center of the first side surface of the first lens to the imaging surface of the optical lens on the optical axis, and the optical back focus BFL of the optical lens refers to the on-axis distance from the second side surface of the sixth lens to the imaging surface. The maximum field of view FOV of the optical lens is associated with the image height H, and H refers to the image height corresponding to the maximum field of view FOV of the optical lens.

[0055] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side surface. Optionally, the photosensitive element disposed on the second side surface may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0056] In an exemplary embodiment, the optical lens provided herein can be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the first side of the optical lens can be the object side, and the second side can be the image source side or the light source side. Light from the image source side or the light source side passes through the optical lens and is projected onto the object side, for example, to form an image or illuminate an area on the object side. The second side of the optical lens can be provided with the image source surface or the light source surface of the optical lens. In this case, the total optical length (TTL) of the optical lens is the distance on the optical axis from the center of the first side surface of the first lens to the image source surface or the light source surface of the optical lens. The BFL of the optical lens refers to the on-axis distance from the second side surface of the sixth lens to the image source surface or the light source surface.

[0057] In an exemplary embodiment, the first lens has negative optical power, and its first side is convex and its second side is concave. The first lens has negative optical power, which has a divergent effect on light, and the convex surface of its first side (object side) faces the first side (object side), so that the incident angle of the light is smaller, which is conducive to collecting more light into the optical system and realizing large field angle imaging; the second side (image side) is concave toward the second side (image side), which can collect as much large field of view light as possible to enter the rear optical system and fix the direction of the edge large angle light. Preferably, the first lens can preferentially use high refractive index materials, and the required incident light angle is smaller, which is conducive to reducing the front port diameter and improving the imaging quality; the first side (object side) of the first lens is designed to be convex, which is conducive to the sliding of water droplets in practical applications and reduces the influence of the outside world on imaging.

[0058] In an exemplary embodiment, the second lens has negative optical power, with a convex first side and a concave second side. The second lens, with its negative optical power, collects light entering through the first lens, reducing the angle between high-angle light and the optical axis, facilitating the miniaturization of subsequent lenses and further reduction in the front aperture. The convex first side (object side) of the second lens further converges light after the first lens, assisting the first lens in converging high-angle light and facilitating the reduction of the aperture of subsequent lenses. The concave second side (image side) of the second lens smoothly receives light from the first side (object side), facilitating the distribution of the angles between light and the optical axis in the inner and outer fields of view (i.e., the central field of view and the peripheral field of view), thereby improving angular resolution and performance.

[0059] In an exemplary embodiment, the third lens has positive optical power, a convex first side surface, and a concave second side surface. The third lens collects light entering through the second lens. Its positive optical power facilitates light convergence, ensuring a smooth transition of light paths, thereby improving resolution, reducing the aperture and length of the optical lens barrel, and achieving miniaturization. For example, the curvature of the first side surface (object side) of the third lens can be designed to be less affected by temperature, resulting in more stable performance. The second side surface (image side) of the third lens is concave, causing light emitted from the second lens to first converge through the first side surface (object side) of the third lens and then diverge through the second side surface (image side) of the third lens. This helps reduce spherical aberration and improves the resolving power of the optical system.

[0060] In an exemplary embodiment, the third lens has positive optical power, a convex first side surface, and a convex second side surface. The third lens collects light entering through the second lens. Its positive optical power facilitates light convergence and a smooth transition of light paths, thereby facilitating low aberrations, achieving high resolution, reducing the aperture and length of the optical lens barrel, and achieving miniaturization. For example, the curvature of the first side surface (object side) of the third lens can be designed to be less affected by temperature, resulting in more stable performance. The second side surface (image side) and the first side surface (object side) of the third lens are both convex, which can reduce light deflection between the front and rear surfaces, thereby reducing the sensitivity of the system.

[0061] In an exemplary embodiment, the fourth lens has positive power, with both its first and second side surfaces being convex. The fourth lens's positive power facilitates light convergence. Its biconvex shape and gentle lens shape, combined with the positive power of the third lens, further converge the light, allowing it to enter the rear lens smoothly and ensuring a smooth transition.

[0062] In an exemplary embodiment, the fifth lens has negative optical power, with both its first and second side surfaces being concave. This negative optical power and concave-concave shape allow it to collect light entering through the fourth lens, further diverging it within the same field of view. This adjusts the optical path difference between light rays from different fields of view, paving the way for subsequent light rays to converge onto the image plane. The coordination of the fifth lens with the fourth lens further reduces aberrations while ensuring effective and stable final convergence of light rays, ensuring a smooth arrival at the imaging surface. This improves image quality while reducing overall weight and cost.

[0063] In an exemplary embodiment, the fifth lens and the fourth lens can form a double cemented lens. The use of this cemented lens makes the overall structure of the optical lens compact, meets the requirements of miniaturization, and at the same time reduces the sensitivity of the lens unit to tolerances such as tilt and eccentricity generated during the assembly process. The cemented lens can be composed of a positive lens and a negative lens respectively, and adopts opposite optical powers to make the light smoothly transition to the rear lens. In addition, the cemented lens has the following advantages: 1) the various aberrations of the optical system are fully corrected, and under the premise of a compact structure, the resolution can be improved, and the optical performance such as distortion and CRA can be optimized; 2) the light on the first side surface (object side) of the fifth lens and the second side surface (image side) of the fourth lens has almost the same trend, without obvious deflection, so the light emitted by the fourth lens can be well received by the fifth lens, which can reduce the light loss caused by reflection between lenses and improve the relative illumination of each field of view; 3) the field curvature can be further reduced to correct the off-axis point aberration of the system. Among them, the positive lens can have a lower refractive index, and the negative lens can have a higher refractive index (relative to the positive lens). The combination of high and low refractive indices is conducive to the rapid transition of the front light and reduces aberrations.

[0064] In an exemplary embodiment, the sixth lens element has positive optical power, a convex first side surface, and a concave second side surface. The sixth lens element's positive optical power facilitates light convergence. Furthermore, the concave second side surface (image side) of the sixth lens element creates a difference in the convergence positions of light rays in the inner and outer fields of view, correcting for field curvature and achieving high resolution. The sixth lens element fully corrects various aberrations of the optical system, improving resolution, distortion, and CRA (Chief Ray Angle) while maintaining a compact structure.

[0065] In an exemplary embodiment, the sixth lens has positive optical power, with a convex first side and a convex second side. The sixth lens has positive optical power, which facilitates light convergence. Its biconvex shape and large shape variation between the center and edge of the lens allow light rays passing through the doublet lens formed by the fourth and fifth lenses to converge smoothly onto the image plane, improving imaging astigmatism and field curvature, and enhancing the resolving power of the optical system. Both the first (object-side) and second (image-side) sides of the sixth lens are convex, allowing light rays to converge twice. The marginal light rays are deflected toward the optical axis after passing through the second (image-side) side of the sixth lens, helping to shorten physical distances, reduce the overall length of the optical system, and facilitate miniaturization. The sixth lens can fully correct various aberrations of the optical system, improving resolution, optimizing distortion, CRA, and other optical properties while maintaining a compact structure.

[0066] In an exemplary embodiment, the first and second side surfaces of the second, fourth, fifth, and sixth lenses are all aspherical mirror surfaces. The curvature of each aspherical surface varies, which helps correct system aberrations and field curvature, thereby improving the resolving power of the optical system.

[0067] In an exemplary embodiment, the optical lens according to the present application may further include an aperture, which may be positioned between the third and fourth lenses. The aperture facilitates the effective convergence of light entering the optical system, reduces the aperture of the lens at the front end of the optical system, and reduces the system's assembly sensitivity. However, it should be noted that the aperture position disclosed herein is merely illustrative and not limiting; in alternative embodiments, the aperture may be positioned elsewhere as needed.

[0068] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: 10 ≤ TTL / F ≤ 12.5, where TTL is the total optical length of the optical lens and F is the total effective focal length of the optical lens. This condition, by controlling the ratio of the total lens length to the focal length, facilitates miniaturization while maintaining a wide field of view. More specifically, TTL and F can further satisfy 10.5 ≤ TTL / F ≤ 12.2, further facilitating miniaturization.

[0069] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 7≤R52 / F≤30, where R52 is the radius of curvature of the second side surface of the fifth lens element, and F is the total effective focal length of the optical lens element. Satisfying 7≤R52 / F≤30, the second side surface of the fifth lens element is configured so that the paraxial region is concave and satisfies the above range, which can reasonably adjust the divergence angle of the light, facilitating the light rays to reach a reasonable image height position, thereby reducing edge distortion while shortening TTL. Furthermore, the second side surface of the fifth lens element can be configured so that the paraxial region is concave and the edge region is convex, facilitating better small edge distortion. More specifically, R52 and F can further satisfy 8≤R52 / F≤28, and can further satisfy 11≤R52 / F≤26, facilitating better small distortion.

[0070] In an exemplary embodiment, the optical lens according to the present application has a maximum field of view (FOV) that satisfies: FOV ≥ 180°, exhibiting a wide field of view. More specifically, the FOV may further satisfy: 180° ≤ FOV ≤ 220°, and further satisfy: 200° ≤ FOV ≤ 205.4°.

[0071] In exemplary embodiments, the optical lens according to the present application can satisfy the following conditions: T34 / TTL ≤ 0.02, where T34 is the air spacing between the third and fourth lenses on the optical axis, and TTL is the total optical length of the optical lens. Meeting T34 / TTL ≤ 0.02 shortens the distance between the third and fourth lenses, facilitating overall miniaturization and shortening the total optical length (TTL). It also reduces the pressure of light converging on the first side of the fourth lens, allowing for smoother light convergence and improved resolution. More specifically, T34 and TTL can further satisfy T34 / TTL ≤ 0.015, and even further satisfy 0.005 ≤ T34 / TTL ≤ 0.011, further facilitating miniaturization and improved resolution. It should be noted that in the present application, the air spacing between the third and fourth lenses on the optical axis can be as low as 0.078 mm. This allows for a very small design, achieving both high image quality and miniaturization.

[0072] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: 0.75 ≤ |F4 / F5| ≤ 1.2, where F4 is the effective focal length of the fourth lens element and F5 is the effective focal length of the fifth lens element. This 0.75 ≤ |F4 / F5| ≤ 1.2 condition allows the focal lengths of the fourth and fifth lenses to be close, allowing the offset changes of the image planes of the fourth and fifth lenses to complement each other at high temperatures, thereby improving the lens's thermal performance. More specifically, F4 and F5 can further satisfy 0.8 ≤ |F4 / F5| ≤ 1.1, further improving the lens's temperature performance.

[0073] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 2≤F3 / F≤4.5, where F3 is the effective focal length of the third lens and F is the total effective focal length of the optical lens. By satisfying 2≤F3 / F≤4.5 and rationally controlling the focal length of the third lens, the third lens receives light diverged by the first and second lenses and effectively converges it to the rear optical system, which is conducive to miniaturization while reducing light energy loss and improving resolution. Furthermore, in addition to satisfying 2≤F3 / F≤4.5, the optical lens may also satisfy 0.75≤|F4 / F5|≤1.2, with the fourth and fifth lenses compensating for the light offset, which is conducive to good temperature performance. More specifically, F3 and F may further satisfy 2.5≤F3 / F≤4, which is conducive to better miniaturization and high resolution.

[0074] In an exemplary embodiment, the optical lens according to the present application may satisfy: -2.5≤F2 / F≤-1.6, where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens. Satisfying -2.5≤F2 / F≤-1.6, by rationally allocating the focal length of the second lens to meet the above range, the second lens may preferably be a plastic lens, which is beneficial for adjusting the image plane offset under high temperature, matching the thermal compensation of the entire module, and helping to improve the high temperature performance of the lens. More specifically, F2 and F may further satisfy -2.3≤F2 / F≤-1.8, and may further satisfy -2.2≤F2 / F≤-1.9, which is beneficial for better improving the temperature performance of the lens.

[0075] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: -5.5 ≤ F1 / F ≤ -3, where F1 is the effective focal length of the first lens element and F is the total effective focal length of the optical lens element. When -5.5 ≤ F1 / F ≤ -3 is satisfied, the focal length of the first lens element is relatively small, which facilitates collecting light from a large field of view and achieving wide-angle characteristics. More specifically, F1 and F may further satisfy -5.3 ≤ F1 / F ≤ -3, further satisfy -5.3 ≤ F1 / F ≤ -3.2, and further satisfy -5 ≤ F1 / F ≤ -3.5, further facilitating the realization of a wide field of view.

[0076] In an exemplary embodiment, the optical lens according to the present application can satisfy the following relationship: -0.9 ≤ F2 / F3 ≤ -0.4, where F3 is the effective focal length of the third lens element and F2 is the effective focal length of the second lens element. When -0.9 ≤ F2 / F3 ≤ -0.4 is satisfied, the focal lengths of adjacent second and third lenses are similar, which facilitates a smooth transition of light, improves image quality, and achieves high resolution. More specifically, F2 and F3 can further satisfy -0.8 ≤ F2 / F3 ≤ -0.5, further facilitating high resolution.

[0077] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 40° ≤ (FOV × F) / H ≤ 50°, where H is the image height corresponding to the maximum field of view of the optical lens, FOV is the maximum field of view of the optical lens, and F is the total effective focal length of the optical lens. Satisfying 40° ≤ (FOV × F) / H ≤ 50° helps reduce distortion by controlling the ratio of the lens's maximum field of view, focal length, and image height. More specifically, FOV, F, and H may further satisfy 43° ≤ (FOV × F) / H ≤ 48°, which helps achieve better results in minimal distortion.

[0078] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: 0.2 ≤ R21 / TTL ≤ 1.5, where R21 is the radius of curvature of the first side surface of the second lens element, and TTL is the total optical length of the optical lens element. This condition allows adjustment of the relative position of the first side surface of the second lens element and the pupil image of the secondary reflection ghost image of the color filter on the focal plane. By controlling the radius of curvature of the first side surface of the second lens element, the pupil image of the ghost image can be moved away from the focal plane, effectively reducing the relative energy of the ghost image. More specifically, R21 and TTL can further satisfy the condition of 0.3 ≤ R21 / TTL ≤ 1.3, which facilitates achieving low ghost image characteristics.

[0079] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: 0.12 ≤ CT45 / TTL ≤ 0.2, where CT45 is the sum of the center thicknesses of the fourth and fifth lenses on the optical axis, and TTL is the total optical length of the optical lens. Meeting 0.12 ≤ CT45 / TTL ≤ 0.2 and properly arranging the center thicknesses of the fourth and fifth lenses can enhance their light control capabilities, allowing more light to enter the rear system and improving the system's relative illumination. More specifically, CT45 and TTL can further satisfy 0.14 ≤ CT45 / TTL ≤ 0.18, further improving the system's relative illumination.

[0080] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: 3.5 ≤ F45 / F ≤ 14, where F45 is the combined focal length of the fourth and fifth lenses, and F is the total effective focal length of the optical lens. The forward light rays converge rapidly after passing through the third lens, satisfying 3.5 ≤ F45 / F ≤ 14. This results in a relatively large combined focal length of the fourth and fifth lenses, facilitating a smooth transition of light rays, reducing sensitivity, and improving image quality. By controlling the overall positive focal length of the cemented lens formed by the fourth and fifth lenses, the trajectory of light entering the cemented lens can be effectively controlled. When the F45 / F value exceeds the upper limit of the conditional range, the focal length of the cemented lens formed by the fourth and fifth lenses is too strong. While this can reduce the overall length of the system, the resulting astigmatism, field curvature, and distortion are too large to be corrected. When the F45 / F value exceeds the lower limit of the conditional range, the focal power of the cemented lens formed by the fourth and fifth lenses is weakened, and the aforementioned aberrations are relatively reduced. However, the reduced refractive power results in a longer system, hindering miniaturization. More specifically, F45 and F can further satisfy 5.5≤F45 / F≤12.2, which is conducive to better achieving miniaturization and high resolution.

[0081] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: 1.5 ≤ F6 / F ≤ 4, where F6 is the effective focal length of the sixth lens element, and F is the total effective focal length of the optical lens. By controlling the focal length of the sixth lens element, the degree of convergence of light rays from each field of view on the image plane can be effectively adjusted, facilitating adjustment of field curvature for both internal and external fields of view, thereby improving overall performance. More specifically, F6 and F can further satisfy 2 ≤ F6 / F ≤ 3, facilitating better adjustment of field curvature for both internal and external fields of view, thereby enhancing resolution.

[0082] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: 2.3 ≤ CT4 / CT5 ≤ 4.5, where CT4 is the center thickness of the fourth lens element on the optical axis, and CT5 is the center thickness of the fifth lens element on the optical axis. Meeting 2.3 ≤ CT4 / CT5 ≤ 4.5 and properly controlling the center-to-thickness ratio of the fourth and fifth lenses facilitates smoother light entering and exiting the cemented lens formed by the fourth and fifth lenses, minimizing deflection and improving resolution. This also balances structural layout and machinability, minimizing the impact of center-to-thickness tolerances on performance. More specifically, CT4 and CT5 can further satisfy 2.6 ≤ CT4 / CT5 ≤ 4.3, and even further, 2.8 ≤ CT4 / CT5 ≤ 4, further reducing lens sensitivity and improving machinability.

[0083] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: 0.24 ≤ ΣT / TTL ≤ 0.32, where ΣT is the sum of the air spacings between any two adjacent lenses on the optical axis, and TTL is the total optical length of the optical lens. By satisfying 0.24 ≤ ΣT / TTL ≤ 0.32 and properly controlling the sum of the air spacings between any two adjacent lenses on the optical axis, the overall lens length can be reduced, achieving miniaturization. Simultaneously, reducing the air gaps between lenses helps minimize angular variations in light between lenses, improving overall performance. However, it should be noted that excessively small air gaps are detrimental to mechanical structure layout and weaken the ability to adjust light deflection within and outside the field of view, hindering adjustments for distortion and field curvature. More specifically, ΣT and TTL can further satisfy 0.26 ≤ ΣT / TTL ≤ 0.3, facilitating further miniaturization and high resolution.

[0084] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 0.01 ≤ TTL / H / FOV × 1° ≤ 0.02, where TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. Satisfying 0.01 ≤ TTL / H / FOV × 1° ≤ 0.02 effectively limits the length of the lens under the same imaging plane and image height, facilitating lens miniaturization. More specifically, TTL, H, and FOV may further satisfy 0.011 ≤ TTL / H / FOV × 1° ≤ 0.016, further facilitating lens miniaturization.

[0085] In an exemplary embodiment, the optical lens according to the present application can satisfy the following conditions: 0.15 ≤ R31 / TTL ≤ 0.5, where R31 is the radius of curvature of the first side surface of the third lens element, and TTL is the total optical length of the optical lens element. When 0.15 ≤ R31 / TTL ≤ 0.5 is satisfied, adjusting the radius of curvature of the first side surface of the third lens element to a smaller value facilitates further light convergence and reduces the overall length of the lens element. However, if the radius of curvature of the first side surface of the third lens element is too small, the incident angle of the edge light on the subsequent lens element will be too large, affecting imaging performance and distortion. More specifically, R31 and TTL can further satisfy 0.18 ≤ R31 / TTL ≤ 0.48, and can even further satisfy 0.24 ≤ R31 / TTL ≤ 0.43, which facilitates miniaturization and minimizes distortion.

[0086] In exemplary embodiments, the optical lens according to the present application can satisfy the following relationship: 0.1 ≤ BFL / TTL ≤ 0.2, where BFL is the optical back focus of the optical lens and TTL is the total optical length of the optical lens. This relationship ensures a guaranteed back focus while achieving miniaturization, facilitating module assembly. More specifically, BFL and TTL can further satisfy 0.13 ≤ BFL / TTL ≤ 0.16, further facilitating optimal back focus characteristics.

[0087] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 0.008 ≤ D / H / FOV × 1° ≤ 0.02, where D is the maximum clear aperture of the first side surface of the first lens, H is the image height corresponding to the maximum field of view of the optical lens, and FOV is the maximum field of view of the optical lens. By satisfying 0.008 ≤ D / H / FOV × 1° ≤ 0.02, miniaturization can be achieved by controlling the front aperture size at the same field of view and image height ratio. More specifically, D, H, and FOV may further satisfy 0.010 ≤ D / H / FOV × 1° ≤ 0.014, which facilitates further miniaturization.

[0088] In an exemplary embodiment, the optical lens according to the present application may meet the following requirements: 1.3 mm -1 ≤D / H / F≤2.2mm -1 , D is the maximum aperture of the first side of the first lens, H is the image height corresponding to the maximum field angle of the optical lens, and F is the total effective focal length of the optical lens. -1 ≤D / H / F≤2.2mm -1 , under the same field of view and the same image height ratio, controlling the focal length of the lens is conducive to shortening the total length of the lens. More specifically, D, H and / F can further meet 1.4mm -1 ≤D / H / F≤2mm -1 , which is conducive to better miniaturization.

[0089] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 7.5 ≤ R11 / F ≤ 10.5, where R11 is the radius of curvature of the first side surface of the first lens element, and F is the total effective focal length of the optical lens. Adjusting the radius of curvature of the first side surface of the first lens element when meeting 7.5 ≤ R11 / F ≤ 10.5 facilitates collecting light rays with a wide field of view angle, reduces the angle between subsequent light rays and the optical axis, and improves edge field resolution. More specifically, R11 and F may further satisfy 7.5 ≤ R11 / F ≤ 10, and even further satisfy 8 ≤ R11 / F ≤ 10, further improving resolution.

[0090] In an exemplary embodiment, the optical lens according to the present application may satisfy the following: 3 ≤ R21 / R22 ≤ 20, where R21 is the radius of curvature of the first side surface of the second lens element, and R22 is the radius of curvature of the second side surface of the second lens element. By controlling the shapes of the first and second side surfaces of the second lens element, 3 ≤ R21 / R22 ≤ 20 is achieved, which facilitates a smooth transition of light and reduces sensitivity. More specifically, R21 and R22 may further satisfy 3.5 ≤ R21 / R22 ≤ 16, and furthermore, 4.5 ≤ R21 / R22 ≤ 14.5, thereby further enhancing the smoothness of light and reducing sensitivity.

[0091] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 0.015 ≤ T56 / TTL ≤ 0.05, where T56 is the air spacing between the fifth and sixth lenses on the optical axis, and TTL is the total optical length of the optical lens. By satisfying 0.015 ≤ T56 / TTL ≤ 0.05 and appropriately controlling the air spacing between the fifth and sixth lenses, it is beneficial to reduce lens reflections and achieve a low ghosting effect. More specifically, T56 and TTL may further satisfy 0.02 ≤ T56 / TTL ≤ 0.05, and even further satisfy 0.02 ≤ T56 / TTL ≤ 0.04, further contributing to a high ghosting effect.

[0092] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 0.780 ≤ D12 / H ≤ 0.900, where D12 is the maximum clear aperture of the sixth lens element, and H is the image height corresponding to the maximum field of view of the optical lens. Satisfying 0.780 ≤ D12 / H ≤ 0.900 and rationally controlling the ratio of the clear aperture to the image height of the second side surface of the sixth lens element facilitates achieving a small CRA. More specifically, D12 and H may further satisfy 0.810 ≤ D12 / H ≤ 0.869, further facilitating a further reduction in CRA.

[0093] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 0.03 ≤ R41 / R52 ≤ 0.25, where R41 is the radius of curvature of the first side surface of the fourth lens, and R52 is the radius of curvature of the second side surface of the fifth lens. The fourth and fifth lenses may form a doublet lens, satisfying 0.03 ≤ R41 / R52 ≤ 0.25. By controlling the ratio of the radius of curvature of the first and second side surfaces of the doublet lens, the second side surface is flatter than the first side surface, effectively adjusting the angular difference between light entering and exiting the doublet lens, thereby facilitating minimal distortion. More specifically, R41 and R52 may further satisfy 0.08 ≤ R41 / R52 ≤ 0.21, further facilitating minimal distortion.

[0094] In an exemplary embodiment, the first to sixth lenses may be spherical lenses or aspherical lenses. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When the focus is on imaging quality, the number of aspherical lenses can be increased, or even all lenses can use aspherical lenses. Exemplarily, the second lens, the fourth lens, the fifth lens and the sixth lens of the present application may be aspherical lenses, and the first lens and the third lens may be spherical lenses. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens.

[0095] In an exemplary embodiment, the first to sixth lenses may be glass lenses or plastic lenses. This application does not specifically limit the specific number of glass lenses and plastic lenses. Optical lenses made of glass can suppress the deviation of the back focus of the optical lens with temperature changes, so as to improve the stability of the system. At the same time, the use of glass material can avoid problems such as lens imaging blur caused by high and low temperature changes in the use environment and affecting the normal use of the lens. Specifically, when focusing on temperature performance, the first to sixth lenses can all be made of glass. In applications where temperature stability requirements are lower, the first to sixth lenses in the optical lens can also all be made of plastic. Making optical lenses with plastic can effectively reduce production costs. Of course, the first to sixth lenses in the optical lens can also be made of a combination of plastic and glass.

[0096] According to the above-mentioned embodiment of the present application, the optical lens can have at least one beneficial effect of miniaturization, large field of view, low sensitivity, high luminous flux, high resolution, good temperature performance, weak ghost image and small distortion through the reasonable setting of parameters such as the shape of each lens and optical focal length.

[0097] However, those skilled in the art will appreciate that the number of lenses comprising the lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while the embodiments describe an optical lens comprising six lenses as an example, the optical lens is not limited to six lenses. If desired, the optical lens may also include other numbers of lenses. Specific embodiments of optical lenses applicable to the above embodiments will be further described below with reference to the accompanying drawings.

[0098] Example 1

[0099] The following reference Figure 1 An optical lens according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present application is shown.

[0100] like Figure 1 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0101] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-concave lens with positive optical power, whose first side surface S5 is convex and whose second side surface S6 is concave. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, whose first side surface S9 is concave and whose second side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive optical power, whose first side surface S11 is convex and whose second side surface S12 is concave. The fourth lens L4 and the fifth lens L5 form a doublet.

[0102] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4.

[0103] Optionally, the optical lens may further include a filter IR having a first side surface S13 and a second side surface S14 and / or a protective glass CG having a first side surface S15 and a second side surface S16.

[0104] Table 1 shows the curvature radius R, thickness / distance (it should be understood that the thickness / distance in the row where S1 is located is the center thickness of the first lens L1, the thickness / distance in the row where S2 is located is the spacing between the second side surface S2 of the first lens L1 and the first side surface S3 of the second lens L2, the thickness / distance in the row where S3 is located is the center thickness of the second lens L2, and so on), refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 1.

[0105] Table 1

[0106]

[0107]

[0108] In Example 1, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S8 and the second side surface S9 of the fourth lens L4, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. The second side surface S10 of the fifth lens L5 and the first side surface S11 and the second side surface S12 of the sixth lens L6 have an inflection point. The surface shape of each aspherical lens can be defined by, but is not limited to, the following aspheric surface formula:

[0109]

[0110] Where x is the distance from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient for the i-th order of the aspheric surface. Table 2 below lists the conic coefficient k and the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface in Example 1.

[0111] Table 2

[0112] Face number k A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 6.17E+00 3.71E-02 -2.18E-02 6.88E-03 -1.45E-03 2.11E-04 -2.12E-05 1.40E-06 -5.46E-08 9.50E-10 S4 -8.59E-01 5.65E-02 2.37E-05 -5.42E-02 5.16E-02 -2.43E-02 6.48E-03 -9.68E-04 7.42E-05 -2.33E-06 S8 -7.46E+00 5.68E-03 7.00E-01 -5.70E+00 2.67E+01 -7.72E+01 1.39E+02 -1.52E+02 9.22E+01 -2.38E+01 S9 3.73E-01 -8.57E-01 2.01E+00 -4.15E+00 6.21E+00 -5.63E+00 2.02E+00 9.54E-01 -1.12E+00 2.86E-01 S10 7.02E+01 -2.62E-01 4.39E-01 -6.02E-01 6.45E-01 -4.89E-01 2.49E-01 -8.07E-02 1.49E-02 -1.19E-03 S11 -6.69E+00 -1.82E-02 3.02E-02 -3.03E-02 1.85E-02 -6.82E-03 1.49E-03 -1.84E-04 1.09E-05 -1.91E-07 S12 9.23E+01 1.13E-02 -1.48E-02 1.05E-02 -7.32E-03 3.64E-03 -1.10E-03 1.92E-04 -1.77E-05 6.71E-07

[0113] Figure 2 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 1 is shown. MTF stands for modulation transfer function, which describes the ability of the optical lens to "restore" the object space on the image side. The horizontal axis of the modulation transfer function (MTF) curve is the spatial frequency, and the unit of spatial frequency is line pairs per millimeter (lp / mm). The vertical axis represents the optical modulation function value (MTF value). The MTF value is a value between 0 and 1. The larger the value (the closer to 1), the stronger the ability of the lens to restore the real world. Figure 2 It can be seen that the MTF value of the central field of view of the optical lens of Example 1 at a spatial frequency of 65 lp / mm (65 lines / mm) is greater than 0.8.

[0114] Example 2

[0115] The following reference Figure 3 The optical lens according to Example 2 of the present application is described. In this embodiment and the following embodiments, some descriptions similar to those in Example 1 will be omitted for the sake of brevity. Figure 3 A schematic structural diagram of an optical lens according to Example 2 of the present application is shown.

[0116] like Figure 3As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0117] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-concave lens with positive optical power, whose first side surface S5 is convex and whose second side surface S6 is concave. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, whose first side surface S9 is concave and whose second side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive optical power, whose first side surface S11 is convex and whose second side surface S12 is concave. The fourth lens L4 and the fifth lens L5 form a doublet.

[0118] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4.

[0119] Optionally, the optical lens may further include a filter IR having a first side surface S13 and a second side surface S14 and / or a protective glass CG having a first side surface S15 and a second side surface S16.

[0120] Table 3 shows the curvature radius R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 2.

[0121] Table 3

[0122] Face number Curvature radius R(mm) Thickness / distance (mm) Refractive index Nd Abbe number Vd S1 12.0172 1.2206 1.91 35.25 S2 3.7660 1.9440 S3 14.2674 0.7000 1.54 55.86 S4 1.2870 1.5980 S5 4.3499 2.2616 1.95 17.94 S6 140.5547 0.2446 S7(STO) infinity -0.1043 S8 2.7874 1.8363 1.54 55.86 S9 -1.9334 0.5500 1.66 20.37 S10 31.4896 0.4320 S11 1.6953 1.2878 1.54 55.86 S12 23.6434 0.2500 S13 infinity 0.5000 1.52 64.21 S14 infinity 0.7750 S15 infinity 0.4000 1.52 64.21 S16 infinity 0.1250 IMA / /

[0123] In Example 2, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S8 and the second side surface S9 of the fourth lens L4, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces, wherein the first side surface S11 and the second side surface S12 of the sixth lens L6 have an inflection point. Table 4 shows the conic coefficients and higher-order coefficients of the various aspherical mirror surfaces that can be used in Example 2, wherein the surface shape of each aspherical surface can be defined by Formula (1) given in Example 1 above.

[0124] Table 4

[0125]

[0126]

[0127] Figure 4 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 2 is shown. The MTF value of the central field of view of the optical lens of Example 2 at a spatial frequency of 65 lp / mm (65 lines / millimeter) is greater than 0.8.

[0128] Example 3

[0129] The following reference Figure 5 An optical lens according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical lens according to Example 3 of the present application is shown.

[0130] like Figure 5 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0131] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-concave lens with positive optical power, whose first side surface S5 is convex and whose second side surface S6 is concave. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, whose first side surface S9 is concave and whose second side surface S10 is concave. The sixth lens L6 is a convex-convex lens with positive optical power, whose first side surface S11 is convex and whose second side surface S12 is convex. The fourth lens L4 and the fifth lens L5 form a doublet.

[0132] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4.

[0133] Optionally, the optical lens may further include a filter IR having a first side surface S13 and a second side surface S14 and / or a protective glass CG having a first side surface S15 and a second side surface S16.

[0134] Table 5 shows the curvature radius R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 3.

[0135] Table 5

[0136]

[0137]

[0138] In Example 3, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S8 and the second side surface S9 of the fourth lens L4, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. The second side surface S10 of the fifth lens L5 has an inflection point. Table 6 shows the conic coefficients and higher-order coefficients of the various aspherical mirror surfaces that can be used in Example 3. The surface shape of each aspherical surface can be defined by Formula (1) given in Example 1 above.

[0139] Table 6

[0140] Face number k A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 4.02E+00 3.94E-02 -2.45E-02 7.85E-03 -1.65E-03 2.36E-04 -2.28E-05 1.43E-06 -5.18E-08 8.33E-10 S4 -9.31E-01 5.37E-02 7.66E-03 -8.21E-02 8.68E-02 -4.85E-02 1.64E-02 -3.38E-03 3.89E-04 -1.92E-05 S8 -6.20E+00 -9.34E-03 6.97E-01 -5.63E+00 2.65E+01 -7.69E+01 1.39E+02 -1.52E+02 9.28E+01 -2.40E+01 S9 6.89E-01 -4.70E-01 3.21E-01 4.76E-01 -3.37E+00 8.71E+00 -1.26E+01 1.05E+01 -4.67E+00 8.56E-01 S10 -6.86E+01 -1.47E-01 1.38E-01 -1.13E-01 8.21E-02 -4.54E-02 1.71E-02 -3.90E-03 4.40E-04 -1.34E-05 S11 -5.00E+00 -2.50E-02 2.74E-02 -2.12E-02 1.17E-02 -4.44E-03 1.11E-03 -1.71E-04 1.47E-05 -5.29E-07 S12 -5.11E-01 4.11E-02 -1.03E-02 -5.39E-04 1.42E-03 -5.41E-04 1.04E-04 -1.06E-05 4.71E-07 -3.07E-09

[0141] Figure 6 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 3 is shown. The MTF value of the central field of view of the optical lens of Example 3 at a spatial frequency of 65 lp / mm (65 lines / millimeter) is greater than 0.8.

[0142] Example 4

[0143] The following reference Figure 7 An optical lens according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0144] like Figure 7 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0145] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-concave lens with positive optical power, whose first side surface S5 is convex and whose second side surface S6 is concave. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, whose first side surface S9 is concave and whose second side surface S10 is concave. The sixth lens L6 is a convex-convex lens with positive optical power, whose first side surface S11 is convex and whose second side surface S12 is convex. The fourth lens L4 and the fifth lens L5 form a doublet.

[0146] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4.

[0147] Optionally, the optical lens may further include a filter IR having a first side surface S13 and a second side surface S14 and / or a protective glass CG having a first side surface S15 and a second side surface S16.

[0148] Table 7 shows the curvature radius R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 4.

[0149] Table 7

[0150]

[0151]

[0152] In Example 4, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S8 and the second side surface S9 of the fourth lens L4, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. The second side surface S10 of the fifth lens L5 has an inflection point. Table 8 shows the conic coefficients and higher-order coefficients of the various aspherical mirror surfaces that can be used in Example 4. The surface shape of each aspherical surface can be defined by Formula (1) given in Example 1 above.

[0153] Table 8

[0154] Face number k A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 4.76E+00 3.97E-02 -2.51E-02 8.20E-03 -1.76E-03 2.56E-04 -2.51E-05 1.59E-06 -5.84E-08 9.53E-10 S4 -9.36E-01 5.28E-02 9.53E-03 -8.98E-02 9.67E-02 -5.51E-02 1.90E-02 -3.98E-03 4.64E-04 -2.32E-05 S8 -5.94E+00 -1.02E-02 7.94E-01 -6.86E+00 3.46E+01 -1.07E+02 2.08E+02 -2.45E+02 1.60E+02 -4.44E+01 S9 1.27E+00 -4.74E-01 2.96E-01 4.79E-01 -3.04E+00 7.57E+00 -1.09E+01 9.15E+00 -4.09E+00 7.49E-01 S10 -9.90E+01 -1.58E-01 1.57E-01 -1.36E-01 1.06E-01 -6.49E-02 2.90E-02 -8.69E-03 1.54E-03 -1.21E-04 S11 -5.45E+00 -2.87E-02 3.48E-02 -2.78E-02 1.56E-02 -6.04E-03 1.54E-03 -2.43E-04 2.16E-05 -8.10E-07 S12 -1.61E+00 3.99E-02 -9.15E-03 -2.23E-04 9.26E-04 -3.19E-04 4.87E-05 -2.44E-06 -1.96E-07 2.06E-08

[0155] Figure 8 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 4 is shown. The MTF value of the central field of view of the optical lens of Example 4 at a spatial frequency of 65 lp / mm (65 lines / millimeter) is greater than 0.8.

[0156] Example 5

[0157] The following reference Figure 9 An optical lens according to Example 5 of the present application is described. Figure 9 A structural schematic diagram of an optical lens according to Example 5 of the present application is shown.

[0158] like Figure 9 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0159] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive optical power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, whose first side surface S9 is concave and whose second side surface S10 is concave. The sixth lens L6 is a convex-convex lens with positive optical power, whose first side surface S11 is convex and whose second side surface S12 is convex. The fourth lens L4 and the fifth lens L5 form a doublet.

[0160] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4.

[0161] Optionally, the optical lens may further include a filter IR having a first side surface S13 and a second side surface S14 and / or a protective glass CG having a first side surface S15 and a second side surface S16.

[0162] Table 9 shows the curvature radius R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 5.

[0163] Table 9

[0164] Face number Curvature radius R(mm) Thickness / distance (mm) Refractive index Nd Abbe number Vd S1 12.0380 1.1500 1.91 35.25 S2 3.7130 1.8806 S3 5.9368 0.7020 1.54 55.86 S4 1.2044 1.7124 S5 6.6020 2.4500 1.95 17.94 S6 -17.4340 0.2520 S7(STO) infinity -0.0950 S8 3.2633 2.1900 1.54 55.86 S9 -3.3493 0.5570 1.66 20.37 S10 16.1555 0.4886 S11 2.3880 1.6200 1.54 55.86 S12 -7.5534 0.2500 S13 infinity 0.5000 1.52 64.21 S14 infinity 1.0878 S15 infinity 0.4000 1.52 64.21 S16 infinity 0.1250 IMA / /

[0165] In Example 5, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S8 and the second side surface S9 of the fourth lens L4, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. The first side surface S1 of the second lens L2, the second side surface S10 of the fifth lens L5, and the first side surface S11 of the sixth lens L6 have an inflection point. Tables 10-1 and 10-2 show the conic coefficients and higher-order coefficients of the various aspherical mirror surfaces that can be used in Example 5. The surface shape of each aspherical surface can be defined by Formula (1) given in Example 1 above.

[0166] Table 10-1

[0167]

[0168]

[0169] Table 10-2

[0170] Face number A22 A24 A26 A28 A30 S3 -9.72E-09 3.63E-10 -9.05E-12 1.34E-13 -7.94E-16 S4 2.47E-03 -3.01E-04 2.44E-05 -1.18E-06 2.56E-08 S8 7.03E+01 -2.45E+01 5.59E+00 -7.47E-01 4.45E-02 S9 5.14E+02 -1.86E+02 4.36E+01 -6.01E+00 3.67E-01 S10 -6.68E-02 1.98E-02 -3.64E-03 3.82E-04 -1.75E-05 S11 -5.32E-06 3.74E-07 -1.70E-08 4.64E-10 -5.97E-12 S12 8.53E-10 -2.38E-11 2.47E-12 6.94E-13 -8.53E-14

[0171] Figure 10 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 5 is shown. The MTF value of the central field of view of the optical lens of Example 5 at a spatial frequency of 65 lp / mm (65 lines / millimeter) is greater than 0.8.

[0172] Example 6

[0173] The following reference Figure 11 An optical lens according to Example 6 of the present application is described. Figure 11 A structural schematic diagram of an optical lens according to Example 6 of the present application is shown.

[0174] like Figure 11 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0175] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive optical power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, whose first side surface S9 is concave and whose second side surface S10 is concave. The sixth lens L6 is a convex-convex lens with positive optical power, whose first side surface S11 is convex and whose second side surface S12 is convex. The fourth lens L4 and the fifth lens L5 form a doublet.

[0176] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4.

[0177] Optionally, the optical lens may further include a filter IR having a first side surface S13 and a second side surface S14 and / or a protective glass CG having a first side surface S15 and a second side surface S16.

[0178] Table 11 shows the curvature radius R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 6.

[0179] Table 11

[0180]

[0181]

[0182] In Example 6, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S8 and the second side surface S9 of the fourth lens L4, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. The first side surface S1 of the second lens L2 and the second side surface S10 of the fifth lens L5 have an inflection point. Tables 12-1 and 12-2 show the conic coefficients and higher-order coefficients of the various aspherical mirror surfaces that can be used in Example 6. The surface shape of each aspherical surface can be defined by Formula (1) given in Example 1 above.

[0183] Table 12-1

[0184] Face number k A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -3.37E+01 5.87E-02 -9.88E-02 1.09E-01 -8.97E-02 5.35E-02 -2.29E-02 7.10E-03 -1.60E-03 2.63E-04 S4 -1.07E+00 6.09E-02 1.23E-02 -6.46E-01 2.32E+00 -4.74E+00 6.44E+00 -6.10E+00 4.13E+00 -2.01E+00 S8 -3.04E+00 -1.91E-02 5.25E-01 -3.80E+00 1.68E+01 -4.84E+01 9.48E+01 -1.30E+02 1.26E+02 -8.69E+01 S9 -1.24E+01 -9.20E-01 4.82E+00 -3.35E+01 1.64E+02 -5.42E+02 1.24E+03 -2.02E+03 2.34E+03 -1.94E+03 S10 -2.31E+02 -9.93E-02 1.09E-01 -2.11E-01 5.68E-01 -1.14E+00 1.55E+00 -1.46E+00 9.70E-01 -4.55E-01 S11 -4.49E+00 -7.43E-03 -2.01E-02 5.14E-02 -6.41E-02 4.98E-02 -2.59E-02 9.33E-03 -2.36E-03 4.22E-04 S12 -1.77E+02 -1.13E-02 1.57E-02 -1.18E-02 4.85E-03 -1.21E-03 1.92E-04 -1.99E-05 1.39E-06 -6.53E-08

[0185] Table 12-2

[0186] Face number A22 A24 A26 A28 A30 S3 -3.10E-05 2.55E-06 -1.39E-07 4.48E-09 -6.51E-11 S4 6.97E-01 -1.68E-01 2.68E-02 -2.54E-03 1.08E-04 S8 4.23E+01 -1.41E+01 3.08E+00 -3.93E-01 2.02E-02 S9 1.14E+03 -4.59E+02 1.21E+02 -1.87E+01 1.29E+00 S10 1.50E-01 -3.38E-02 4.95E-03 -4.24E-04 1.61E-05 S11 -5.27E-05 4.49E-06 -2.48E-07 7.98E-09 -1.13E-10 S12 2.16E-09 -4.97E-11 -1.15E-12 -2.85E-13 3.09E-14

[0187] Figure 12 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 6 is shown. The MTF value of the central field of view of the optical lens of Example 6 at a spatial frequency of 65 lp / mm (65 lines / millimeter) is greater than 0.8.

[0188] Example 7

[0189] The following reference Figure 13 An optical lens according to Example 7 of the present application is described. Figure 13 A structural schematic diagram of an optical lens according to Example 7 of the present application is shown.

[0190] like Figure 13 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0191] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive optical power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, whose first side surface S9 is concave and whose second side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive optical power, whose first side surface S11 is convex and whose second side surface S12 is concave. The fourth lens L4 and the fifth lens L5 form a doublet.

[0192] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4.

[0193] Optionally, the optical lens may further include a filter IR having a first side surface S13 and a second side surface S14 and / or a protective glass CG having a first side surface S15 and a second side surface S16.

[0194] Table 13 shows the curvature radius R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 7.

[0195] Table 13

[0196] Face number Curvature radius R(mm) Thickness / distance (mm) Refractive index Nd Abbe number Vd S1 12.0611 1.2786 1.91 35.25 S2 3.7114 1.8907 S3 10.7574 0.7000 1.54 55.86 S4 1.2404 1.6235 S5 4.5373 2.2309 1.95 17.94 S6 -139.8819 0.2450 S7(STO) infinity -0.1050 S8 2.8349 1.8398 1.54 55.86 S9 -1.8226 0.5500 1.66 20.37 S10 32.4377 0.4272 S11 1.7141 1.2676 1.54 55.86 S12 45.0000 0.2500 S13 infinity 0.5000 1.52 64.21 S14 infinity 0.7750 S15 infinity 0.4000 1.52 64.21 S16 infinity 0.1250 IMA / /

[0197] In Example 7, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S8 and the second side surface S9 of the fourth lens L4, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. The second side surface S10 of the fifth lens L5 and the first side surface S11 and the second side surface S12 of the sixth lens L6 have an inflection point. Table 14 shows the conic coefficients and higher-order coefficients of the various aspherical mirror surfaces that can be used in Example 7. The surface shape of each aspherical surface can be defined by Formula (1) given in Example 1 above.

[0198] Table 14

[0199]

[0200]

[0201] Figure 14 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 7 is shown. The MTF value of the central field of view of the optical lens of Example 7 at a spatial frequency of 65 lp / mm (65 lines / millimeter) is greater than 0.8.

[0202] Example 8

[0203] The following reference Figure 15 An optical lens according to Example 8 of the present application is described. Figure 15 A structural schematic diagram of an optical lens according to Example 8 of the present application is shown.

[0204] like Figure 15 As shown, the optical lens includes, from the first side to the second side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0205] The first lens L1 is a convex-concave lens with negative optical power, whose first side surface S1 is convex and whose second side surface S2 is concave. The second lens L2 is a convex-concave lens with negative optical power, whose first side surface S3 is convex and whose second side surface S4 is concave. The third lens L3 is a convex-convex lens with positive optical power, whose first side surface S5 is convex and whose second side surface S6 is convex. The fourth lens L4 is a convex-convex lens with positive optical power, whose first side surface S8 is convex and whose second side surface S9 is convex. The fifth lens L5 is a convex-concave lens with negative optical power, whose first side surface S9 is concave and whose second side surface S10 is concave. The sixth lens L6 is a convex-concave lens with positive optical power, whose first side surface S11 is convex and whose second side surface S12 is concave. The fourth lens L4 and the fifth lens L5 form a doublet.

[0206] The optical lens may further include a stop STO, which may be disposed between the third lens L3 and the fourth lens L4.

[0207] Optionally, the optical lens may further include a filter IR having a first side surface S13 and a second side surface S14 and / or a protective glass CG having a first side surface S15 and a second side surface S16.

[0208] Table 15 shows the curvature radius R, thickness / distance, refractive index Nd, and Abbe number Vd of each lens of the optical lens of Example 8.

[0209] Table 15

[0210] Face number Curvature radius R(mm) Thickness / distance (mm) Refractive index Nd Abbe number Vd S1 11.7409 1.4188 1.91 35.25 S2 3.5855 1.9540 S3 18.2753 0.7000 1.54 55.86 S4 1.2816 1.4968 S5 4.6834 2.2806 1.95 17.94 S6 -54.1091 0.2374 S7(STO) infinity -0.0976 S8 2.7161 1.7807 1.54 55.86 S9 -1.7689 0.5500 1.66 20.37 S10 31.5717 0.3970 S11 1.6941 1.2079 1.54 55.86 S12 45.0000 0.2500 S13 infinity 0.5000 1.52 64.21 S14 infinity 0.7750 S15 infinity 0.4000 1.52 64.21 S16 infinity 0.1250 IMA / /

[0211] In Example 8, the first side surface S3 and the second side surface S4 of the second lens L2, the first side surface S8 and the second side surface S9 of the fourth lens L4, the first side surface S9 and the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 are all aspherical surfaces. The first side surface S1 of the second lens L2, the second side surface S10 of the fifth lens L5, and the first side surface S11 and the second side surface S12 of the sixth lens L6 have an inflection point. Table 16 shows the conic coefficients and higher-order coefficients of the various aspherical mirror surfaces that can be used in Example 8. The surface shape of each aspherical surface can be defined by Formula (1) given in Example 1 above.

[0212] Table 16

[0213] Face number k A4 A6 A8 A10 A12 A14 A16 A18 A20 S3 -2.90E+00 3.70E-02 -2.35E-02 8.07E-03 -1.87E-03 3.01E-04 -3.31E-05 2.37E-06 -9.91E-08 1.84E-09 S4 -8.54E-01 5.76E-02 9.67E-03 -9.34E-02 1.12E-01 -7.38E-02 3.03E-02 -7.69E-03 1.10E-03 -6.86E-05 S8 -5.92E+00 -4.10E-04 7.96E-01 -6.99E+00 3.56E+01 -1.11E+02 2.15E+02 -2.53E+02 1.65E+02 -4.58E+01 S9 5.09E-01 -7.19E-01 1.55E+00 -3.33E+00 6.09E+00 -8.18E+00 7.23E+00 -3.93E+00 1.20E+00 -1.67E-01 S10 8.65E+01 -2.46E-01 4.08E-01 -5.84E-01 6.80E-01 -5.76E-01 3.33E-01 -1.23E-01 2.61E-02 -2.41E-03 S11 -6.07E+00 -2.46E-02 4.05E-02 -3.92E-02 2.41E-02 -9.36E-03 2.15E-03 -2.56E-04 8.51E-06 6.11E-07 S12 9.90E+01 2.22E-02 -2.07E-02 1.50E-02 -1.01E-02 5.10E-03 -1.70E-03 3.43E-04 -3.80E-05 1.76E-06

[0214] Figure 16 The modulation transfer function (MTF) curve of the central field of view of the optical lens of Example 8 is shown. The MTF value of the central field of view of the optical lens of Example 8 at a spatial frequency of 65lp / mm (65 lines / millimeter) is greater than 0.8.

[0215] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 17. In Table 17, the units of F, TTL, H, D, BFL, F1 to F6, D12, and F45 are millimeters (mm), and the unit of FOV is degrees (°).

[0216] Table 17

[0217]

[0218]

[0219] The optical lens provided in this application can be used as, for example, a vehicle-mounted lens or a laser radar receiving end lens. In this case, Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 、 Figure 11 、 Figure 13 and Figure 15 IMA can represent an imaging surface, for example. Light from an object sequentially passes through each surface S1 to S16 and is finally imaged on the imaging surface provided on the second side, wherein an image sensor chip is provided on the imaging surface. It should be understood that the optical lens provided in this application can also be used as a projection lens or a laser radar transmitting end lens, in which case, Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 、 Figure 11 、 Figure 13 and Figure 15 IMA may represent an image source surface or a light source surface, for example. Light from the image source surface or the light source surface sequentially passes through the surfaces S16 to S1 and is finally projected to the first side, for example, forming an image or illuminating an area on the first side.

[0220] The present application also provides an electronic device, which may include an optical lens according to the above-described embodiment of the present application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be a standalone electronic device such as a range detection camera, or an imaging module integrated into a range detection device. Furthermore, the electronic device may be a standalone imaging device such as an onboard camera, or an imaging module integrated into a driver assistance system such as a vehicle.

[0221] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that: The optical lens comprises, in sequence from the first side to the second side along the optical axis: a first lens having negative optical power, wherein the first side surface is convex and the second side surface is concave; a second lens having negative optical power, wherein the first side surface is convex and the second side surface is concave; a third lens element having positive optical power and a convex first side surface; a fourth lens element having positive optical power, wherein the first side surface is convex and the second side surface is convex; a fifth lens element having negative optical power, wherein the first side surface and the second side surface are concave; a sixth lens element having positive optical power, wherein the first side surface thereof is convex; The total optical length TTL of the optical lens and the total effective focal length F of the optical lens satisfy the following conditions: 10≤TTL / F≤12.5; The curvature radius R52 of the second side surface of the fifth lens and the total effective focal length F of the optical lens satisfy: 7≤R52 / F≤30; The maximum field of view (FOV) of the optical lens satisfies: FOV ≥ 180°; An air gap T34 between the third lens and the fourth lens on the optical axis and a total optical length TTL of the optical lens satisfy the following: T34 / TTL≤0.

02.

2. The optical lens according to claim 1, wherein: An air interval T56 between the fifth lens and the sixth lens on the optical axis and a total optical length TTL of the optical lens satisfy the following: 0.02≤T56 / TTL≤0.

05.

3. The optical lens according to claim 1, wherein: The optical lens meets at least one of the following requirements: 0.75≤|F4 / F5|≤1.2; 3.5≤F45 / F≤14; Among them, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F45 is the combined focal length of the fourth lens and the fifth lens, and F is the total effective focal length of the optical lens.

4. The optical lens according to claim 1, wherein: The effective focal length F3 of the third lens and the total effective focal length F of the optical lens satisfy the following: 2≤F3 / F≤4.

5.

5. The optical lens according to claim 1, wherein: The optical lens meets at least one of the following requirements: -2.5≤F2 / F≤-1.6; -0.9≤F2 / F3≤-0.4; Among them, F2 is the effective focal length of the second lens, F is the total effective focal length of the optical lens, and F3 is the effective focal length of the third lens.

6. The optical lens according to claim 1, wherein: The effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy the following: -5.5≤F1 / F≤-3.

7. The optical lens according to claim 1, wherein: The curvature radius R11 of the first side surface of the first lens and the total effective focal length F of the optical lens satisfy: 7.5≤R11 / F≤10.

8. The optical lens according to claim 1, wherein: The maximum field of view FOV of the optical lens, the total effective focal length F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy the following conditions: 40°≤(FOV×F) / H≤50°.

9. The optical lens according to claim 1, wherein: The curvature radius R21 of the first side surface of the second lens and the total optical length TTL of the optical lens satisfy the following relationship: 0.2≤R21 / TTL≤1.

5.

10. The optical lens according to claim 1, wherein: The optical lens meets at least one of the following conditions: 0.12≤CT45 / TTL≤0.2; 2.3≤CT4 / CT5≤4.5; Among them, CT45 is the sum of the center thicknesses of the fourth lens and the fifth lens on the optical axis, TTL is the total optical length of the optical lens, CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

11. The optical lens according to claim 1, wherein: The effective focal length F1 of the first lens and the total effective focal length F of the optical lens satisfy the following: -5.3≤F1 / F≤-3.

12. The optical lens according to claim 1, wherein: The sum of the air intervals ΣT between any two adjacent lenses from the first lens to the sixth lens on the optical axis and the total optical length TTL of the optical lens satisfy the following conditions: 0.24≤ΣT / TTL≤0.

32.

13. The optical lens according to claim 1, wherein: The optical lens meets at least one of the following conditions: 0.01≤TTL / H / FOV×1°≤0.02, 0.008≤D / H / FOV×1°≤0.02, 1.3mm -1 ≤D / H / F≤2.2mm -1 , wherein TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, FOV is the maximum field of view angle of the optical lens, D is the maximum clear aperture of the first side surface of the first lens, and F is the total effective focal length of the optical lens.

14. The optical lens according to claim 1, wherein: The curvature radius R31 of the first side surface of the third lens and the total optical length TTL of the optical lens satisfy the following relationship: 0.15≤R31 / TTL≤0.

5.

15. The optical lens according to claim 1, wherein: The optical lens satisfies at least one of the following conditions: 0.1≤BFL / TTL≤0.2, 7.5≤R11 / F≤10.5, 3.5≤R21 / R22≤16, 0.015≤T56 / TTL≤0.05, 0.780≤D12 / H≤0.900, 0.03≤R41 / R52≤0.25, T34 / TTL≤0.015, -2.3≤F2 / F≤-1.8, -5.3≤F1 / F≤- 3.2, 1.5≤F6 / F≤4, 8≤R52 / F≤28, 3≤R21 / R22≤20, 0.18≤R31 / TTL≤0.48, 2.6≤CT4 / CT5≤4.3, 180°≤FOV≤220°, where BFL is the optical back focus of the optical lens, TTL is the total optical length of the optical lens, H is the image height corresponding to the maximum field of view angle of the optical lens, and FOV is the maximum field of view of the optical lens. angle, F is the total effective focal length of the optical lens, R11 is the radius of curvature of the first side surface of the first lens, R21 is the radius of curvature of the first side surface of the second lens, R22 is the radius of curvature of the second side surface of the second lens, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, D12 is the maximum clear aperture of the second side surface of the sixth lens, R41 is the radius of curvature of the first side surface of the fourth lens, R52 is the radius of curvature of the second side surface of the fifth lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F6 is the effective focal length of the sixth lens, R31 is the radius of curvature of the first side surface of the third lens, CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

16. The optical lens according to any one of claims 1 to 15, characterized in that: The second side surface of the third lens is a convex surface or a concave surface.

17. The optical lens according to any one of claims 1 to 15, characterized in that: The second side surface of the sixth lens is a convex surface or a concave surface.

18. The optical lens according to claim 1, wherein: The optical lens meets at least one of the following requirements: 0.005≤T34 / TTL≤0.011, 10.5≤TTL / F≤12.2, 0.8≤|F4 / F5|≤1.1, 2.5≤F3 / F≤4, -2.2≤F2 / F≤-1.9, -5≤F1 / F≤-3.5, 11≤R52 / F≤26, 0.13≤BFL / TTL≤0.16, 0.010≤D / H / FOV×1°≤0.014, 1.4mm -1 ≤D / H / F≤2mm -1 , -0.8≤F2 / F3≤-0.5, 8≤R11 / F≤10, 43°≤(FOV×F) / H≤48°, 4.5≤R21 / R22≤14.5, 0.02≤T56 / TTL≤0.04, 0.3≤R21 / TTL≤1.3, 0.14≤CT45 / TTL≤0.18, 0.810≤D12 / H≤0.869, 5.5≤F45 / F≤12.2, 0.08≤R41 / R52≤0.21, 0.24≤R31 / TTL≤0.43, 2≤F6 / F≤3, 2.8≤CT4 / CT5≤4, 0.26≤ΣT / TTL≤0.3, 0.011≤TTL / H / FOV×1°≤0.016, 200°≤FOV≤205.4°, in, T34 is the air distance between the third lens and the fourth lens on the optical axis, TTL is the total optical length of the optical lens, F is the total effective focal length of the optical lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, F3 is the effective focal length of the third lens, F2 is the effective focal length of the second lens, F1 is the effective focal length of the first lens, R52 is the curvature radius of the second side surface of the fifth lens, BFL is the optical back focus of the optical lens, D is the maximum clear aperture of the first side surface of the first lens, H is the image height corresponding to the maximum field of view angle of the optical lens, FOV is the maximum field of view angle of the optical lens, R11 is the curvature radius of the first side surface of the first lens, and R21 is the curvature radius of the first side surface of the second lens. curvature radius, R22 is the curvature radius of the second side surface of the second lens, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, CT45 is the sum of the center thicknesses of the fourth lens and the fifth lens on the optical axis, D12 is the maximum clear aperture of the sixth lens, F45 is the combined focal length of the fourth lens and the fifth lens, R41 is the curvature radius of the first side surface of the fourth lens, R31 is the curvature radius of the first side surface of the third lens, F6 is the effective focal length of the sixth lens, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, and ΣT is the sum of the air gaps between any two adjacent lenses from the first lens to the sixth lens on the optical axis.

19. An electronic device, characterized in that: The invention comprises the optical lens according to any one of claims 1 to 18 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

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